A device and method for detecting sealing performance in a shaft furnace

Abstract

The present invention relates to the field of seal detection technology, and in particular to a device and method for detecting the seal inside a vertical furnace, comprising a mounting sleeve for carrying components; a plurality of detection boxes fixedly mounted on the outside of the mounting sleeve; the detection boxes opening outward and having an air inlet arranged on one side facing the mounting sleeve; an airbag assembly arranged circumferentially of the detection box; an adjustment assembly arranged within the mounting sleeve; the adjustment assembly including an air inlet duct and a plurality of air duct groups corresponding to each detection box; each air duct group including a first air duct and a second air duct both connected to the air inlet duct, and a detection mechanism; in a sealed state, only the first air duct in the adjustment assembly is connected to the airbag assembly; in an inflated state, only the second air duct in the adjustment assembly is connected to the air inlet; in a detection state, only the detection mechanism in the adjustment assembly is connected to the air inlet. The present invention can effectively solve the problem in the prior art that the location of seal failure cannot be directly displayed, resulting in low detection efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing detection, and in particular to a device and method for detecting the sealing performance of a shaft furnace. Background Art

[0002] A vertical copper furnace is a device that melts copper plates or ingots into molten copper. The final quality of the copper product is directly related to the quality of the molten copper produced by the furnace. To prevent gas exchange between the furnace and the outside during smelting, which could lead to impurities or a lack of essential components in the molten copper, thus affecting its quality, the furnace must have a good seal. Before each use, the furnace must be inspected for seal performance.

[0003] In existing related technologies, the entire interior of the shaft furnace is pressurized and then the opening of the shaft furnace is sealed. After a period of time, the internal pressure of the shaft furnace is determined to be sufficient to determine whether the shaft furnace is leaking. However, this method usually only determines whether the overall seal of the shaft furnace is qualified, but cannot accurately determine the specific location of the seal failure. Personnel must also conduct secondary inspections at various locations within the furnace, resulting in low detection efficiency and accuracy. Summary of the Invention

[0004] The present invention provides a device and method for detecting the sealing performance of a shaft furnace, which can effectively solve the problem in existing related sealing detection technologies that the sealing failure position cannot be directly displayed, resulting in low detection efficiency and accuracy.

[0005] The present invention provides a device for detecting the sealing performance of a shaft furnace, comprising:

[0006] A mounting sleeve for carrying components;

[0007] A plurality of detection boxes are fixedly mounted on the outside of the mounting sleeve; the detection boxes are open outwards, and an air inlet is provided on a side facing the mounting sleeve;

[0008] An airbag assembly is arranged around the detection box;

[0009] An adjustment component is arranged in the mounting sleeve; the adjustment component includes an air inlet duct and a plurality of air duct groups corresponding to each detection box;

[0010] Each air passage group includes a first air passage and a second air passage, both of which are in communication with the air inlet passage, and a detection mechanism;

[0011] In the sealed state, only the first air passage in the adjustment assembly is connected to the airbag assembly;

[0012] In the inflated state, only the second air passage in the adjustment assembly is connected to the air inlet;

[0013] In the detection state, only the detection mechanism in the adjustment component is connected to the air inlet.

[0014] Furthermore, the airbag assembly includes a plurality of annular airbags and a plurality of vertical airbags; the annular airbags are placed at the top and bottom of the detection box; and the vertical airbags are placed between the vertical side surfaces of two adjacent detection boxes.

[0015] Furthermore, a sealing strip is provided around the opening of the detection box, and the sealing strip is in contact with the airbag assembly.

[0016] Furthermore, the detection mechanism includes a third air channel, a fourth air channel having one end connected to one end of the third air channel, a fifth channel connected to a middle section of the third air channel, and a detection ball placed in the third air channel;

[0017] In the detection state, the third air passage is communicated with the air inlet, and the fourth air passage is communicated with the airbag assembly.

[0018] Furthermore, an end of the third air passage close to the air inlet is higher than an end of the third air passage away from the air inlet.

[0019] Furthermore, a spherical surface is provided at the connection between the third air channel and the fourth air channel, and the radius of the spherical surface is the same as that of the detection sphere.

[0020] Furthermore, an observation port is provided at the bottom end of the fifth channel.

[0021] Furthermore, the adjustment assembly includes a pull rod that slides axially along the mounting sleeve, and a plurality of airway blocks sleeved on the pull rod; the airway group is arranged on the airway blocks.

[0022] Furthermore, a connecting pipe is provided at the air inlet of the detection box; the connecting pipe is screwed into the side wall of the detection box, and one end of the connecting pipe extends out of the inner wall of the detection box.

[0023] The present invention also provides a method for detecting the sealing performance of a shaft furnace, which is used in the above-mentioned device for detecting the sealing performance of a shaft furnace, comprising:

[0024] S10: Switch the adjustment component to a sealed state, so that the air inlet duct is not inflated, and then place the device into the vertical furnace;

[0025] S20: Inflate the air inlet duct to inflate the airbag assembly to block the gap between the opening of the detection box and the inner wall of the vertical furnace;

[0026] S30: Switch the adjustment component to the inflation state to generate a certain air pressure in the detection box;

[0027] S40: Switch the adjustment component back to the sealing state to maintain the air inlet duct;

[0028] S50: After maintaining the step for a period of time, the adjustment component is switched to the detection state, and the air pressure in the detection box is detected by the detection mechanism.

[0029] The technical solution of the present invention can achieve the following technical effects:

[0030] This device, through the cooperation of a detection box and an airbag assembly, divides the interior of the shaft furnace into multiple zones and performs separate inspections on each zone. This allows the detection mechanism to quickly locate the location of a seal failure when it occurs, effectively improving both inspection efficiency and accuracy. Furthermore, this device allows for direct inspection of the shaft furnace's sidewalls. Traditional inspection methods require sealing off the furnace's various inlets and outlets, and when a poor seal is detected, it's necessary to confirm the effectiveness of the seals on each inlet and outlet. This device eliminates these steps, further improving inspection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the structure of the sealing detection device in the shaft furnace of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the installation sleeve in the present invention;

[0034] Figure 3 This is a component breakdown diagram of the adjustment assembly in the present invention;

[0035] Figure 4 It is a structural schematic diagram of the detection box in the present invention;

[0036] Figure 5 This is a structural diagram of another view of the detection box in the present invention;

[0037] Figure 6 Schematic diagram of the structure of the airbag assembly of the present invention;

[0038] Figure 7 A top view of the sealing detection device for a shaft furnace according to the present invention;

[0039] Figure 8 For the present invention Figure 7 A sectional view of the part;

[0040] Figure 9In the present invention, when in a sealed state Figure 7 Cross-sectional view at point B;

[0041] Figure 10 In the present invention, when inflated Figure 7 Cross-sectional view at point B;

[0042] Figure 11 In the present invention, when in the detection state Figure 7 Cross-sectional view at point B;

[0043] Figure markings: 1. Mounting sleeve; 11. Shelf; 12. Extension section; 2. Detection box; 21. Air inlet; 22. Sealing strip; 23. Connecting pipe; 31. Annular airbag; 32. Vertical airbag; 41. Air inlet duct; 42. First air duct; 43. Second air duct; 44. Third air duct; 45. Fourth air duct; 46. Fifth channel; 47. Detection ball; 48. Observation port; 4a. Pull rod; 4b. Air duct block. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0045] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; they may refer to mechanical or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] The present invention relates to a device for detecting the sealing performance of a shaft furnace. Figures 1 to 7 Shown, including:

[0048] The mounting sleeve 1 is the main load-bearing structure of the device and is used to support other components of the device. The mounting sleeve 1 is composed of multiple shelves 11. The number of shelves 11 can be increased or decreased according to the height of the vertical furnace, thereby adjusting the overall height of the device. The shelves 11 are provided with multiple radially extending extension sections 12. The shelves 11 are connected by bolts installed on the extension sections 12.

[0049] Multiple detection boxes 2 are fixedly installed on the outside of the installation sleeve 1; the multiple detection boxes 2 are divided into multiple layers equal to the number of shelves 11, and the detection boxes 2 in each layer are distributed in a circle around the circumference of the shelf 11; during installation, the detection boxes 2 are kept open outward; an air inlet 21 is provided on the side of the detection box 2 facing the installation sleeve 1;

[0050] The airbag assembly is arranged around the detection box 2. After ventilation, the airbag assembly will swell and block the gap between the detection box 2 and the vertical furnace;

[0051] The adjustment assembly is arranged in the mounting sleeve 1; the adjustment assembly includes a vertically arranged air inlet 41 and a plurality of air duct groups, the number of which is the same as the number of the detection boxes 2, and each air duct group corresponds to one detection box 2;

[0052] Each air passage group includes a first air passage 42 and a second air passage 43 both communicating with the air inlet passage 41 , and a detection mechanism.

[0053] The specific working principle of this device is as follows:

[0054] After placing the device into the vertical furnace, first control the adjustment component to switch to the sealed state. In this state, if Figure 9 As shown, only the first air channel 42 in the adjustment assembly is connected to the airbag assembly, and the second air channel 43 and the detection mechanism are in a blocked state (not connected to any air channel and cannot participate in work); at this time, when air is inflated into the air inlet channel 41, the gas will enter the airbag assembly along the first air channel 42, and the airbag assembly will swell to block the gap between the opening of the detection box 2 and the vertical furnace, thereby forming a sealed cavity inside the detection box 2.

[0055] After the opening of the detection box 2 is sealed, the adjustment component can be switched to the inflation state. In this state, Figure 10 As shown, only the second air duct 43 in the adjustment component is connected to the air inlet 21, and the first air duct 42 and the detection mechanism are in a blocked state (not connected to any air duct and cannot participate in work); at this time, when air is inflated into the air inlet duct 41, the gas will enter the detection box 2 along the second air duct 43, thereby increasing the air pressure in all detection boxes 2.

[0056] After a period of time, if the inner wall of the vertical furnace corresponding to the detection box 2 fails to seal and leaks, the air pressure in the detection box 2 will decrease, while the air pressure in other detection boxes 2 will not decrease. At this time, the adjustment component can be switched to the detection state. In this state, if Figure 11 As shown, in the adjustment assembly, only the detection mechanism is connected to the air inlet 21, and the first air duct 42 and the second air duct 43 are in a blocked state (not connected to any air duct and cannot participate in work). Each detection mechanism is used to detect the air pressure in each corresponding detection box 2, so as to determine whether the sealing ability of the vertical furnace side wall corresponding to each detection box 2 is intact.

[0057] As can be seen, the present device, through the cooperation of the inspection box 2 and the airbag assembly, divides the interior of the shaft furnace into multiple zones, and performs separate inspections on each zone. Thus, when a seal failure occurs, the detection mechanism can quickly determine the location of the seal failure, effectively improving inspection efficiency and accuracy. Furthermore, the present device can directly inspect the sidewalls of the shaft furnace, whereas traditional inspection methods require sealing various inlets and outlets of the shaft furnace. When a poor seal is discovered, it is also necessary to confirm the effectiveness of the sealing of each inlet and outlet. The present device eliminates these steps, further improving inspection efficiency.

[0058] The airbag assembly can be a structure that is directly wrapped around the opening of the detection box 2. However, this structure has a bending at the corner of the detection box 2, which easily forms a gap after inflation and causes air leakage. Therefore, a better airbag assembly structure is proposed in this device, such as Figure 6 and Figure 8 As shown, the airbag assembly includes multiple annular airbags 31 and multiple vertical airbags 32. The annular airbags 31 are placed at the top and bottom of the test box 2 and are positioned entirely between two adjacent layers of test boxes 2. Each annular airbag 31 covers all test boxes 2 on a layer, with the outermost edges of the annular airbags 31 aligned with the openings of the test boxes 2. The vertical airbags 32 are placed between the vertical side faces of two adjacent test boxes 2 on each layer, with the upper and lower sides of the vertical airbags 32 respectively supporting the annular airbags 31 above and below. With this structure, neither the annular airbags 31 nor the vertical airbags 32 will bend. When inflated, they expand outward based on their own shapes, effectively conforming to the openings of the test boxes 2 in all directions, ensuring a better seal.

[0059] A plurality of slots may be provided on the detection box 2 , which will abut against the extension sections 12 after the detection box 2 is installed, thereby preventing the detection box 2 from shaking.

[0060] For ease of processing and molding, the test box 2 is typically made of plastic and is manufactured using injection molding. The smoothness of the plastic will somewhat affect the sealing effect at the opening of the test box 2. Therefore, a sealing strip 22 can be provided along the circumference of the opening of the test box 2. The inner circle of the sealing strip 22 is smaller than the opening of the test box 2, allowing the sealing strip 22 to adhere tightly to the opening. The sealing strip 22 also mates with the annular airbag 31 and vertical airbag 32 of the airbag assembly. The annular airbag 31 and vertical airbag 32 are also typically made of rubber, forming a better seal with the rubber sealing strip 22. If necessary, a corresponding groove can be provided at the opening of the test box 2, and the sealing strip 22 can be installed within the groove to limit the position of the sealing strip 22.

[0061] The detection mechanism can use existing air pressure detection sensors and other technologies. However, since there are a large number of detection boxes 2 in this device, if all of them use sensors, not only will it have high requirements for processing and installation, but it will also require constant attention to the number of sensors and their corresponding positions during use, and it will also require attention to the arrangement and connection of a large number of wires, so the practicality is poor. This device proposes a detection mechanism with a purely mechanical structure, the specific structure is as follows Figures 9-11 As shown, it includes a third air channel 44, one end of which is directed toward the detection box 2 and the other end is directed toward the center of the adjustment assembly;

[0062] and a fourth air passage 45, one end of the fourth air passage 45 being in communication with an end of the third air passage 44 toward the center of the adjustment assembly;

[0063] and a fifth channel 46 , which is vertically arranged and has a top portion connected to the middle section of the third air channel 44 ;

[0064] And a detection ball 47 , the detection ball 47 placed in the third air channel 44 .

[0065] The specific testing principles of this testing agency are as follows:

[0066] When the adjustment assembly is switched to the detection state, the end of the third air channel 44 facing the detection box 2 is connected to the air inlet 21, and the end of the fourth air channel 45 not connected to the third air channel 44 is connected to the airbag assembly. In this case, if there is no air leakage in the detection box 2, the air pressure between the detection box 2 and the airbag assembly is the same, and no airflow is generated.

[0067] If a leak occurs in the detection box 2, causing the air pressure to drop, a pressure differential will form between the detection box 2 and the airbag assembly, causing air to flow along the fourth air channel 45 into the third air channel 44, pushing the detection ball 47 toward the fifth channel 46 and eventually falling to the bottom of the fifth channel 46. An observation port 48 can be provided at the bottom of the fifth channel 46. After the test is completed and the device is removed from the vertical furnace, the detection ball 47 can be observed through the observation port 48 to determine whether the corresponding detection box 2 is leaking.

[0068] It is preferred that the third air channel 44 is arranged to form a certain inclination angle with the horizontal direction, and the end of the third air channel 44 close to the air inlet 21 is higher than the end of the third air channel 44 away from the air inlet 21, such as Figure 9 As shown, under the action of gravity, the detection ball 47 will always be at the lowest point of the third air channel 44, and will not easily shake in the absence of airflow, effectively preventing the detection ball 47 from accidentally falling into the fifth channel 46 and affecting the accuracy of detection.

[0069] The connection between the third air channel 44 and the fourth air channel 45 is preferably set to a spherical surface, and the spherical surface has the same radius as the detection ball 47, so that the detection ball 47 can block the third air channel 44 and the fourth air channel 45. When the fourth air channel 45 blows air into the third air channel 44, it will definitely push the detection ball 47, thereby further ensuring the accuracy of the detection.

[0070] The adjustment assembly can be configured as a valve group, which controls the opening and closing of each air path by controlling the opening and closing of each valve. However, due to the large number of air paths and the compact structure in this device, the above-mentioned prior art is not very effective. Therefore, a more optimal adjustment assembly structure is proposed in this device, including a pull rod 4a that slides axially along the mounting sleeve 1, and multiple airway blocks 4b mounted on the pull rod 4a. The length of the pull rod 4a is equivalent to the height of the device, and it can drive all the airway blocks 4b mounted on it to operate simultaneously. Each airway block 4b corresponds to a shelf 11, and the airway groups are arranged on the airway blocks 4b. The number of airway groups arranged on each airway block 4b is the same as the number of detection boxes 2 on that layer, and each airway group corresponds to a detection box 2. In this way, when using this device, it is only necessary to connect the extended portion of the pull rod 4a to the power mechanism and the air pipe to achieve overall control of the adjustment assembly. At the same time, the detection mechanism of this device can also be easily processed and formed under such a structure with multiple airway blocks 4b.

[0071] Annular sealing rings are provided on both sides of the airway block 4b corresponding to the first airway 42, the second airway 43, the third airway 44 and the fourth airway 45, and the airways are separated by the sealing rings to avoid mutual influence between the airways and inaccurate detection results.

[0072] Since the detection box 2 needs to fit with the installation sleeve 1, the inward surface of the detection box 2 will be a curved structure. Under this structure, it will be more difficult to ensure the sealing at the air inlet 21. Therefore, this device provides a connecting pipe 23 at the air inlet 21 of the detection box 2. The connecting pipe 23 is screwed into the side wall of the detection box 2, and one end of the connecting pipe 23 extends out of the inner wall of the detection box 2. A sealing ring is installed on the extended end, which is inserted into the hole of the installation sleeve 1 to achieve sealing.

[0073] The present invention also relates to a method for detecting the sealing performance of a shaft furnace, which is used in the above-mentioned device for detecting the sealing performance of a shaft furnace, comprising:

[0074] S10: The adjustment assembly is switched to a sealed state, and at this time, no air is inflated in the air inlet duct 41; a crane hook is hooked onto the installation sleeve 1, and the entire device is moved above the vertical furnace, and then the hook is lowered to place the device into the vertical furnace;

[0075] S20: Inflate the air inlet duct 41 to inflate the airbag assembly to block the gap between the opening of the detection box 2 and the inner wall of the vertical furnace, thereby sealing the detection box 2;

[0076] S30: Switching the adjustment component to the inflation state, the second air channel 43 is connected to the air inlet 21, so that the air in the air inlet 41 can enter the detection box 2, thereby generating a certain air pressure in the detection box 2;

[0077] S40: The adjustment assembly is switched back to the sealing state, and the first air passage 42 is reconnected to the airbag assembly. At this time, it is necessary to maintain the inflation of air into the air inlet passage 41 so that the airbag assembly remains in the inflated state to ensure that the gap between the opening of the detection box 2 and the inner wall of the vertical furnace is blocked;

[0078] S50: After maintaining step S40 for a period of time, if the seal of a certain part of the vertical furnace fails, the air pressure in the detection box 2 at the corresponding position will decrease. At this time, the adjustment component is switched to the detection state, and the air pressure in the detection box 2 is detected by the detection mechanism, so as to quickly find the location of the seal failure in the vertical furnace.

[0079] When using the detection mechanism provided by this device for testing, you also need to pay attention to the control sequence during pressure relief. The specific control sequence is as follows:

[0080] S60: After the detection is completed, the adjustment component is switched back to the sealed state, and then the air inlet 41 is connected to the outside. At this time, the gas in the airbag component will be discharged along the first air channel 42. The shrinkage of the airbag component will also make the gap between the opening of the detection box 2 and the inner wall of the vertical furnace no longer blocked, and the gas in the detection box 2 will also begin to leak out, completing the overall pressure relief of the device. Moreover, since the airbag component and the detection box 2 are depressurized almost at the same time, the movement of the detection ball 47 will not be caused, thereby ensuring the accuracy of the detection result.

[0081] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the sealing performance of a shaft furnace, characterized in that: include: A mounting sleeve (1) for carrying a component; A plurality of detection boxes (2) are fixedly mounted on the outside of the mounting sleeve (1); the detection boxes (2) are open outward, and an air inlet (21) is provided on a side facing the mounting sleeve (1); An airbag assembly is arranged around the detection box (2); the airbag assembly comprises a plurality of annular airbags (31) and a plurality of vertical airbags (32); the annular airbags (31) are placed at the top and bottom of the detection box (2); the vertical airbags (32) are placed between the vertical side surfaces of two adjacent detection boxes (2); An adjustment component is arranged in the installation sleeve (1); the adjustment component includes an air inlet (41) and a plurality of air channel groups corresponding to each of the detection boxes (2); Each of the airway groups includes a first airway (42) and a second airway (43) both communicating with the air inlet (41), and a detection mechanism; The detection mechanism includes a third air channel (44), a fourth air channel (45) whose one end is connected to one end of the third air channel (44), a fifth channel (46) connected to the middle section of the third air channel (44), and a detection ball (47) placed in the third air channel (44); In the sealed state, only the first air passage (42) in the adjustment assembly is connected to the airbag assembly; In the inflated state, only the second air passage (43) in the adjustment assembly is connected to the air inlet (21); In the detection state, only the detection mechanism in the adjustment component is connected to the air inlet (21); the third air passage (44) is connected to the air inlet (21), and the fourth air passage (45) is connected to the airbag component; The specific detection methods are as follows: S10: Switch the adjustment component to a sealed state, so that the air inlet duct (41) is not inflated, and then place the device into a vertical furnace; S20: Inflate the air inlet duct (41) to inflate the airbag assembly to block the gap between the opening of the detection box (2) and the inner wall of the vertical furnace; S30: switching the adjustment component to the inflation state to generate a certain air pressure in the detection box (2); S40: Switching the adjustment component back to the sealing state to maintain the air inlet duct (41); S50: After maintaining step S40 for a period of time, the adjustment component is switched to the detection state, and the air pressure in the detection box (2) is detected by the detection mechanism.

2. The device for detecting the sealing performance of a shaft furnace according to claim 1, wherein: A sealing strip (22) is provided around the opening of the detection box (2), and the sealing strip (22) is in contact with the airbag assembly.

3. The device for detecting the sealing performance of a shaft furnace according to claim 1, wherein: An end of the third air channel (44) close to the air inlet (21) is higher than an end of the third air channel (44) away from the air inlet (21).

4. The device for detecting the sealing performance of a shaft furnace according to claim 3, wherein: A spherical surface is provided at the connection between the third air channel (44) and the fourth air channel (45), and the spherical surface has the same radius as the detection ball (47).

5. The device for detecting the sealing performance of a shaft furnace according to claim 1, wherein: An observation port (48) is provided at the bottom end of the fifth channel (46).

6. The device for detecting the sealing performance of a shaft furnace according to claim 1, wherein: The adjustment assembly comprises a pull rod (4a) that slides axially along the mounting sleeve (1), and a plurality of airway blocks (4b) sleeved on the pull rod (4a); the airway group is arranged on the airway blocks (4b).

7. The device for detecting the sealing performance of a shaft furnace according to claim 1, wherein: A connecting pipe (23) is provided at the air inlet (21) of the detection box (2); the connecting pipe (23) is screwed into the side wall of the detection box (2), and one end of the connecting pipe (23) extends out of the inner wall of the detection box (2).

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