An on-line monitoring and alarming device for harmful gases in an engineering environment and its monitoring method

Abstract

The present invention discloses an on-line monitoring and alarm device for harmful gases in the engineering environment air and its monitoring method, belonging to the technical field of air monitoring. An on-line monitoring and alarm device for harmful gases in the engineering environment air includes an annular shell, a collection pipe is arranged on the annular shell, filters are arranged at both open ends of the collection pipe, a detection pipe is arranged inside the collection pipe, an air monitoring assembly and an air flow sensor are arranged inside the detection pipe, a micro fan is arranged inside the collection pipe, a turning component for adjusting the position of the micro fan is arranged on the annular shell, cleaning components for cleaning impurities on the filters are arranged at both ends of the collection pipe, the turning component is connected to the cleaning components, and an installation shell is arranged outside the annular shell; through the cooperation of the turning component and the cleaning components, the impurities on the filters at the openings of the collection pipe are effectively treated, avoiding the blockage of the filters and affecting the gas collection effect, thereby ensuring the monitoring efficiency and monitoring effect of harmful gases in the air.

Description

Technical Field

[0001] The present invention relates to the technical field of air monitoring, and particularly relates to an on-line monitoring and alarm device for harmful gases in the engineering environment air and a monitoring method thereof. Background Art

[0002] At present, in the industrial production process, air quality needs to be monitored in some places to solve the air pollution problem. There are a large number of toxic and harmful gas pollutants in the air at the places where monitoring is required. These gas pollutants exist in molecular state, and most of them are inorganic gases. Long-term exposure to such a polluted environment will cause serious harm to physical health. It is necessary to monitor and give early warning to the air in the working environment in real time.

[0003] A harmful gas automatic detection and alarm device, by fixedly installing a micro exhaust fan at the ventilation opening, speeds up the gas flow rate, thereby improving the detection sensitivity and efficiency, and can achieve early warning; however, in specific use, air flows into the ventilation opening for a long time. Although the impurities and dust in the air flow can be intercepted by the filter screen, after a large amount of impurities accumulate on the filter screen, it will affect the suction effect of the device on the air flow, and then reduce the gas monitoring effect. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and to propose an on-line monitoring and alarm device for harmful gases in the engineering environment air and a monitoring method thereof.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] An on-line monitoring and alarm device for harmful gases in the engineering environment air, including an annular shell, a collection pipe is arranged on the annular shell, filter screens are arranged at both ends of the collection pipe, a detection pipe is arranged in the collection pipe, an air monitoring assembly and an air flow sensor are arranged in the detection pipe, a micro fan is arranged in the collection pipe, a turning component for adjusting the position of the micro fan is arranged on the annular shell, cleaning components for cleaning impurities on the filter screens are arranged at both ends of the collection pipe, the turning component is connected to the cleaning components, an installation shell is arranged outside the annular shell, a circuit board electrically connected to the air flow sensor is fixedly arranged inside the installation shell, and a display screen and a speaker are arranged outside the installation shell.

[0007] Preferably, the turning component includes support plates fixedly arranged on both sides of the inner wall of the installation shell, rotating rods are rotatably connected to both support plates, a driving motor for driving the rotating rod to rotate is fixedly arranged on one of the support plates, a main bevel gear is arranged on the rotating rod, a bevel gear ring is meshed and connected to the outside of the main bevel gear, a rotating plate fixedly connected to the bevel gear ring is rotatably connected to the annular shell, and a support seat connected to the micro fan is fixedly arranged on the rotating plate.

[0008] Preferably, a groove communicating with the annular shell is formed in the collection tube, and an arc-shaped partition for blocking the groove is fixedly arranged on the rotating plate.

[0009] Preferably, the cleaning assembly includes a pneumatic tube fixedly arranged in the installation shell. The pneumatic tube and the central axis of the rotating rod are on the same straight line, and the pneumatic tube is sleeved outside the rotating rod. A piston is slidably connected between the inner wall of the pneumatic tube and the outer wall of the rotating rod. An air inlet valve and an air outlet valve are arranged on the pneumatic tube. The pneumatic tube is connected with an air inlet pipe communicating with the inner cavity of the collection tube through the air inlet valve, and the pneumatic tube is connected with an air outlet pipe through the air outlet valve. One end of the air outlet pipe far away from the pneumatic tube passes through the collection tube and is connected with a guide pipe. A plurality of spray heads are equidistantly arranged on the guide pipe.

[0010] Preferably, the cleaning assembly further includes a first reciprocating lead screw fixedly connected with the rotating rod. A first sleeve is threadedly connected to the first reciprocating lead screw. A push rod is fixedly arranged on the first sleeve. One end of the push rod far away from the first sleeve passes through the pneumatic tube and is connected with the piston.

[0011] Preferably, a rotating tube is rotatably connected in the collection tube. The spray head is rotatably connected with the rotating tube through a pin shaft. A torsion spring for driving the spray head to reset and rotate is arranged on the pin shaft. The spray head includes a spray head main body rotatably connected with the rotating tube and a connecting hose connected between the spray head main body and the guide pipe. A driven gear is arranged at the top of the rotating tube. A rack plate is meshed and connected outside the driven gear. A connecting rod is arranged between the first sleeve and the rack plate.

[0012] Preferably, a connecting seat is fixedly arranged outside the rotating tube. The guide pipe is slidably connected with the connecting seat. A winding drum is arranged on the rotating tube. A pull rope is wound and connected to the winding drum. One end of the pull rope far away from the winding drum passes through the collection tube and is connected with the top of the guide pipe.

[0013] Preferably, a second reciprocating lead screw is rotatably connected in the collection tube. An active gear meshing with the driven gear is arranged at the top of the second reciprocating lead screw. The active gear adopts a flywheel structure. A second sleeve is threadedly connected to the second reciprocating lead screw. An abutting block movably abutted against the filter screen is rotatably connected to the second sleeve. A side plate is fixedly arranged on the rotating tube. A guide rod slidably connected with the abutting block is fixedly arranged on the side plate.

[0014] Preferably, the air monitoring assembly includes a smoke sensor, an alcohol sensor, a carbon dioxide sensor and a carbon monoxide sensor. The air monitoring assembly is electrically connected with the circuit board.

[0015] The present invention also discloses a monitoring method for an on-line monitoring and alarm device for harmful gases in the engineering environment air, which further includes the following steps:

[0016] S1: Control the operation of the micro-fan. The micro-fan sucks air through the opening at the end of the collection tube. The sucked air enters the detection tube after being filtered by the filter screen to remove impurities. The air monitoring assembly in the detection tube detects harmful gases in the air, and the detected air is discharged from the other opening of the collection tube.

[0017] S2: As the micro-fan continues to work, the air flow sensor detects that the air flow entering the collection tube decreases to a preset value, and impurities accumulate on the filter screen at the air intake opening of the collection tube. Control the driving motor to operate. The output shaft of the driving motor drives the rotating rod to rotate. The main bevel gear on the rotating rod meshes with the bevel gear ring for transmission. The bevel gear ring drives the micro-fan to move through the rotating plate. The micro-fan moves along the annular shell, so that the micro-fan moves from the original air intake port position of the collection tube to the original air outlet port position.

[0018] S3: When the rotating rod rotates, it drives the first reciprocating lead screw to rotate. The first sleeve reciprocates axially along the first reciprocating lead screw. The first sleeve drives the piston to reciprocate in the pneumatic tube through the push rod. The pneumatic tube sucks the air in the collection tube through the intake pipe and discharges the air to the guide pipe through the outlet pipe. The guide pipe discharges the air to the filter screen through the spray head, so that the dust and impurities attached to the filter screen at the original air intake opening fall off.

[0019] S4: After the position of the micro-fan is adjusted, the original air outlet opening of the collection tube becomes the air intake opening, and the dust and impurities that have fallen at the original air intake opening are blown away by the air flow discharged from the current air outlet opening, so that the fallen dust and impurities will no longer be sucked by the collection tube, improving the subsequent air collection speed of the collection tube.

[0020] S5: When the harmful gases in the air detected by the detection tube are excessive, the display screen on the installation shell displays the monitoring information and gives an early warning through the speaker.

[0021] Compared with the prior art, the present invention provides an on-line monitoring and alarm device for harmful gases in the engineering environment air and its monitoring method, which has the following beneficial effects:

[0022] 1. The on-line monitoring and alarm device for harmful gases in the engineering environment air and its monitoring method, through the cooperation of the rotation adjustment component and the cleaning component, effectively treats the impurities on the filter screen at the opening of the collection tube, converts the positions of the air intake opening and the air outlet opening of the collection tube, and the dust and impurities that have fallen at the original air intake opening are blown away by the discharged air flow, avoiding the blockage of the filter screen and affecting the gas collection effect, and thus ensuring the monitoring efficiency and monitoring effect of harmful gases in the air.

[0023] 2. The on-line monitoring and alarming device for harmful gases in the engineering environment air and its monitoring method drive the spray head to swing left and right through a rotating pipe. During this period, the air guide pipe drives the spray head to swing up and down, expanding the working range of the spray head, so that the airflow discharged from the spray head can blow impurities on the filter screen in all directions, improving the cleaning effect of the impurities on the filter screen.

[0024] 3. The on-line monitoring and alarming device for harmful gases in the engineering environment air and its monitoring method drive the abutting block to abut and collide with the filter screen by using the side plate and the guide rod when the rotating pipe rotates, so that the impurities that are not easily blown off on the filter screen fall off. During this period, the second sleeve drives the abutting block to move up and down along the second reciprocating screw rod, so that the abutting block abuts and collides with different positions of the filter screen. While ensuring the impurity removal effect on the filter screen, it can avoid the filter screen being damaged due to the abutting block always knocking on the same position of the filter screen, and improve the service life of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the installation shell of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the present invention after removing the installation shell;

[0028] Figure 4 It is a schematic cross-sectional structure diagram of the annular shell of the present invention;

[0029] Figure 5 For the present invention Figure 4 It is a partially enlarged schematic diagram of part A in the present invention;

[0030] Figure 6 It is a schematic diagram of the structure when the arc-shaped partition rotates in the annular shell of the present invention;

[0031] Figure 7 It is a schematic cross-sectional structure diagram of the pneumatic pipe of the present invention;

[0032] Figure 8 It is a schematic external structure diagram of the rotating pipe of the present invention.

[0033] In the figure: 1, annular shell; 2, collection tube; 201, filter screen; 202, groove; 3, detection tube; 301, air monitoring assembly; 4, air flow sensor; 5, micro fan; 6, mounting shell; 601, circuit board; 602, display screen; 603, speaker; 7, support plate; 701, rotating rod; 702, main bevel gear; 703, bevel gear ring; 704, rotating plate; 7041, arc-shaped partition; 705, support; 706, drive motor; 8, pneumatic tube; 801, piston; 802, intake pipe; 803, outlet pipe; 804, guide pipe; 9, spray head; 901, spray head body; 902, connecting hose; 10, first reciprocating lead screw; 1001, first sleeve; 1002, push rod; 11, rotating tube; 111, driven gear; 112, rack plate; 113, connecting rod; 12, connecting seat; 13, reel; 131, pull rope; 14, second reciprocating lead screw; 141, movable gear; 142, second sleeve; 143, abutting block; 15, side plate; 151, guide rod. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements; for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] Example: Refer to Figure 1 、 Figure 2 、Figure 3 , Figure 4 and Figure 6 , an on - line monitoring and alarm device for harmful gases in the engineering environment air, comprising an annular shell 1. A collecting pipe 2 is arranged on the annular shell 1. Filter meshes 201 are arranged at both open ends of the collecting pipe 2. A detection pipe 3 is arranged inside the collecting pipe 2. An air monitoring assembly 301 and an air flow sensor 4 are arranged inside the detection pipe 3. A micro - fan 5 is arranged inside the collecting pipe 2. A turning - adjustment component for adjusting the position of the micro - fan 5 is arranged on the annular shell 1. Cleaning components for cleaning impurities on the filter meshes 201 are arranged at both ends of the collecting pipe 2. The turning - adjustment component is connected to the cleaning components. An installation shell 6 is arranged outside the annular shell 1. A circuit board 601 electrically connected to the air flow sensor 4 is fixedly arranged inside the installation shell 6. A display screen 602 and a speaker 603 are arranged outside the installation shell 6.

[0038] Specifically, when the micro - fan 5 operates, the micro - fan 5 sucks air through the opening at the end of the collecting pipe 2. The sucked air enters the detection pipe 3 after being filtered by the filter mesh 201 to remove impurities. The air monitoring assembly 301 in the detection pipe 3 detects harmful gases in the air. The detected air is discharged from the other opening of the collecting pipe 2. As the micro - fan 5 continues to work, the air flow sensor 4 detects that the air flow entering the collecting pipe 2 decreases to a preset value, and impurities accumulate on the filter mesh 201 at the air inlet opening of the collecting pipe 2. Through the cooperation of the turning - adjustment component and the cleaning components, the impurities on the filter mesh 201 at the opening of the collecting pipe 2 are effectively processed, and the positions of the air inlet opening and the air outlet opening of the collecting pipe 2 are converted. After the position of the micro - fan 5 is adjusted, the original air outlet opening of the collecting pipe 2 becomes the air inlet opening, and the dust and impurities that originally fell at the air inlet opening are blown away by the air flow discharged from the current air outlet opening, so that the fallen dust and impurities will no longer be sucked by the collecting pipe 2, improving the subsequent air collection speed of the collecting pipe 2 and ensuring the monitoring efficiency and monitoring effect of harmful gases in the air. When the harmful gases in the air detected by the detection pipe 3 are excessive, the display screen 602 on the installation shell 6 displays the monitoring information and gives an early warning through the speaker 603.

[0039] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As a preferred technical solution of the present invention, the turning assembly includes support plates 7 fixedly mounted on both sides of the inner wall of the mounting shell 6, and the two support plates 7 are rotatably connected to a rotating rod 701, and a driving motor 706 for driving the rotating rod 701 to rotate is fixed on one of the support plates 7, and a main bevel gear 702 is provided on the rotating rod 701, and a bevel gear ring 703 is meshed and connected to the outer side of the main bevel gear 702. A rotating plate 704 fixedly connected to the bevel gear ring 703 is rotatably connected to the annular shell 1, and a support 705 connected to the micro fan 5 is fixed on the rotating plate 704; specifically, as the micro fan 5 continues to work, the air flow The volume sensor 4 detects that the air flow rate entering the collection tube 2 is reduced to a preset value, and impurities are accumulated in the filter 201 at the air inlet opening of the collection tube 2. The drive motor 706 is controlled to operate, and the output shaft of the drive motor 706 drives the rotating rod 701 to rotate. The main bevel gear 702 on the rotating rod 701 is engaged with the bevel gear ring 703 for transmission. The bevel gear ring 703 drives the micro fan 5 to move through the rotating plate 704. The micro fan 5 moves along the annular shell 1, so that the micro fan 5 moves from the original air inlet port position of the collection tube 2 to the original air outlet port position, thereby realizing the conversion of the air inlet opening and the air outlet opening of the collection tube 2.

[0040] Reference Figure 4 and Figure 6 As a preferred technical solution of the present invention, a groove 202 connected to the annular shell 1 is opened on the collection tube 2, and an arc-shaped partition 7041 for blocking the groove 202 is fixed on the rotating plate 704; specifically, the arc-shaped partition 7041 is provided on the inner wall of the rotating plate 704 to separate the inner cavity of the annular shell 1 from the inner cavity of the collection tube 2, thereby preventing the air collected by the collection tube 2 from entering the inner cavity of the annular shell 1 through the groove 202 and entering the collection tube 2 through the groove 202 connected to the other end of the annular shell 1 and being discharged, resulting in the air being discharged without being detected. The provision of the arc-shaped partition 7041 effectively ensures the accuracy of the detection results of harmful gases in the air by the collection tube 2.

[0041] Reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 As a preferred technical solution of the present invention, the cleaning component includes a pneumatic tube 8 fixed in the mounting shell 6, the pneumatic tube 8 and the central axis of the rotating rod 701 are in the same straight line, and the pneumatic tube 8 is sleeved on the outside of the rotating rod 701, and a piston 801 is slidably connected between the inner wall of the pneumatic tube 8 and the outer wall of the rotating rod 701. The pneumatic tube 8 is provided with an air inlet valve and an air outlet valve. The pneumatic tube 8 is connected to an air inlet pipe 802 connected to the inner cavity of the collection tube 2 through the air inlet valve, and the pneumatic tube 8 is connected to an air outlet pipe 803 through the air outlet valve. The end of the air outlet pipe 803 away from the pneumatic tube 8 passes through the collection tube 2 and is connected to the air guide pipe 804, and a plurality of nozzle heads 9 are equidistantly arranged on the air guide pipe 804.

[0042] Further, the cleaning component further includes a first reciprocating lead screw 10 fixedly connected to the rotating rod 701. A first sleeve 1001 is threadedly connected to the first reciprocating lead screw 10. A push rod 1002 is fixedly provided on the first sleeve 1001. One end of the push rod 1002 away from the first sleeve 1001 passes through the pneumatic tube 8 and is connected to the piston 801.

[0043] Specifically, the output shaft of the driving motor 706 drives the rotating rod 701 to rotate. When the rotating rod 701 rotates, it drives the first reciprocating lead screw 10 to rotate. The first sleeve 1001 axially reciprocates along the first reciprocating lead screw 10. The first sleeve 1001 drives the piston 801 to reciprocate in the pneumatic tube 8 through the push rod 1002. The pneumatic tube 8 sucks the air in the collection tube 2 through the intake pipe 802 and discharges the air to the air guide pipe 804 through the outlet pipe 803. The air guide pipe 804 discharges the air to the filter screen 201 through the spray head 9, so that the dust and impurities attached to the filter screen 201 at the original air intake opening fall off. After the position of the micro fan 5 is adjusted, the original air outlet opening of the collection tube 2 becomes the air intake opening, and the dust and impurities that have fallen at the original air intake opening are blown away by the airflow discharged from the current air outlet opening, so that the fallen dust and impurities will not be sucked by the collection tube 2 again, improving the subsequent air collection speed of the collection tube 2.

[0044] Referring to Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 As a preferred technical solution of the present invention, a rotating tube 11 is rotatably connected in the collection tube 2. The spray head 9 is rotatably connected to the rotating tube 11 through a pin shaft. A torsion spring for driving the spray head 9 to rotate back to its original position is provided on the pin shaft. The spray head 9 includes a spray head main body 901 rotatably connected to the rotating tube 11 and a connecting hose 902 connected between the spray head main body 901 and the air guide pipe 804. A driven gear 111 is provided at the top of the rotating tube 11. A rack plate 112 is meshed and connected to the outside of the driven gear 111. A connecting rod 113 is provided between the first sleeve 1001 and the rack plate 112.

[0045] Further, a connecting seat 12 is fixedly provided on the outside of the rotating tube 11. The air guide pipe 804 is slidably connected to the connecting seat 12. A winding drum 13 is provided on the rotating tube 11. A pull rope 131 is wound and connected to the winding drum 13. One end of the pull rope 131 away from the winding drum 13 passes through the collection tube 2 and is connected to the top of the air guide pipe 804.

[0046] Specifically, when the rotating rod 701 rotates, it drives the first reciprocating lead screw 10 to rotate. The first sleeve 1001 reciprocates axially along the first reciprocating lead screw 10. The first sleeve 1001 drives the rack plate 112 to move through the connecting rod 113, causing the rack plate 112 to reciprocally engage and drive with the driven gear 111 at the top of the rotating tube 11. The driven gear 111 drives the rotating tube 11 to rotate, causing the rotating tube 11 to drive the spray head 9 to rotate reciprocally left and right. And when the rotating tube 11 rotates reciprocally, the reel 13 reciprocally winds and releases the pull rope 131, so that the air guide pipe 804 drives the spray head body 901 to swing reciprocally up and down through the connecting hose 902, expanding the working range of the spray head 9, enabling the airflow discharged from the spray head 9 to blow impurities on the filter screen 201 in multiple directions, and improving the cleaning effect of the impurities on the filter screen 201.

[0047] Referring to Figure 4 , Figure 5 and Figure 8 , as a preferred technical solution of the present invention, a second reciprocating lead screw 14 is rotatably connected inside the collecting pipe 2. At the top of the second reciprocating lead screw 14, there is a movable gear 141 that meshes with the driven gear 111. The movable gear 141 adopts a flywheel structure. A second sleeve 142 is threadedly connected to the second reciprocating lead screw 14. A contact block 143 that is movably abutted against the filter screen 201 is rotatably connected to the second sleeve 142. A side plate 15 is fixedly provided on the rotating tube 11, and a guide rod 151 that is slidably connected to the contact block 143 is fixedly provided on the side plate 15. Specifically, when the driven gear 111 rotates reciprocally, it meshes and drives with the movable gear 141. The movable gear 141 is arranged in a flywheel structure (the flywheel structure is a prior art), so that the movable gear 141 drives the second reciprocating lead screw 14 to rotate in a single direction, causing the second sleeve 142 to reciprocally move up and down along the axis of the second reciprocating lead screw 14. When the rotating tube 11 rotates, the side plate 15 and the guide rod 151 are used to drive the contact block 143 to abut and collide with the filter screen 201, shaking off the impurities on the filter screen 201 that are not easily blown off. And during this period, the second sleeve 142 drives the contact block 143 to move up and down along the second reciprocating lead screw 14, enabling the contact block 143 to abut and collide with different positions of the filter screen 201. While ensuring the impurity removal effect on the filter screen 201, it can avoid the filter screen 201 from being damaged due to the contact block 143 always knocking on the same position of the filter screen 201, and improving the service life of the filter screen 201.

[0048] Referring to Figure 1 and Figure 4, as a preferred technical solution of the present invention, the air monitoring assembly 301 includes a smoke sensor, an alcohol sensor, a carbon dioxide sensor and a carbon monoxide sensor. The air monitoring assembly 301 is electrically connected to the circuit board 601. Specifically, data is collected by the smoke sensor, the alcohol sensor, the carbon dioxide sensor and the carbon monoxide sensor. If the data exceeds the standard, an alarm can be given through the speaker 603 and the display screen 602 to achieve timely and effective monitoring.

[0049] The present invention also discloses a monitoring method for an on-line monitoring and alarming device for harmful gases in the engineering environment air, which further includes the following steps:

[0050] S1: Control the micro fan 5 to operate. The micro fan 5 sucks air through the opening at the end of the collection tube 2. The sucked air enters the detection tube 3 after filtering impurities through the filter screen 201. The air monitoring assembly 301 in the detection tube 3 detects harmful gases in the air, and the detected air is discharged from the other opening of the collection tube 2.

[0051] S2: As the micro fan 5 continues to work, the air flow sensor 4 detects that the air flow entering the collection tube 2 decreases to a preset value, and impurities accumulate on the filter screen 201 at the air inlet opening of the collection tube 2. Control the driving motor 706 to operate. The output shaft of the driving motor 706 drives the rotating rod 701 to rotate. The main bevel gear 702 on the rotating rod 701 meshes with the bevel gear ring 703 for transmission. The bevel gear ring 703 drives the micro fan 5 to move through the rotating plate 704. The micro fan 5 moves along the annular housing 1, so that the micro fan 5 moves from the original air inlet port position of the collection tube 2 to the original air outlet port position.

[0052] S3: When the rotating rod 701 rotates, it drives the first reciprocating lead screw 10 to rotate. The first sleeve 1001 reciprocates axially along the first reciprocating lead screw 10. The first sleeve 1001 drives the piston 801 to reciprocate in the pneumatic tube 8 through the push rod 1002. The pneumatic tube 8 sucks the air in the collection tube 2 through the air inlet pipe 802 and discharges the air to the air guide pipe 804 through the air outlet pipe 803. The air guide pipe 804 discharges the air to the filter screen 201 through the spray head 9, so that the dust and impurities attached to the filter screen 201 at the original air inlet opening fall off.

[0053] S4: After the position of the micro fan 5 is adjusted, the original air outlet opening of the collection tube 2 becomes the air inlet opening, and the dust and impurities that have fallen at the original air inlet opening are blown away by the air flow discharged from the current air outlet opening, so that the fallen dust and impurities will no longer be sucked by the collection tube 2, improving the subsequent air collection speed of the collection tube 2.

[0054] S5: When the harmful gases in the air detected by the detection tube 3 are excessive, the display screen 602 on the installation shell 6 displays the monitoring information and gives a warning broadcast through the speaker 603.

[0055] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An on-line monitoring and alarming device for harmful gases in the engineering environment air, comprising an annular shell (1), characterized in that, A collecting pipe (2) is arranged on the annular shell (1). Filter meshes (201) are arranged at both openings at the two ends of the collecting pipe (2). A detection pipe (3) is arranged inside the collecting pipe (2). An air monitoring assembly (301) and an air flow sensor (4) are arranged inside the detection pipe (3). A micro fan (5) is arranged inside the collecting pipe (2). A turning component for adjusting the position of the micro fan (5) is arranged on the annular shell (1). Cleaning components for cleaning impurities on the filter meshes (201) are arranged at both ends of the collecting pipe (2). The turning component is connected to the cleaning components. An installation shell (6) is arranged outside the annular shell (1). A circuit board (601) electrically connected to the air flow sensor (4) is fixedly arranged inside the installation shell (6). A display screen (602) and a speaker (603) are arranged outside the installation shell (6). The turning component includes support plates (7) fixedly arranged on both sides of the inner wall of the installation shell (6). Rotating rods (701) are rotatably connected to both of the support plates (7). A driving motor (706) for driving the rotating rod (701) to rotate is fixedly arranged on one of the support plates (7). A main bevel gear (702) is arranged on the rotating rod (701). A bevel gear ring (703) is meshed and connected to the outside of the main bevel gear (702). A rotating plate (704) fixedly connected to the bevel gear ring (703) is rotatably connected to the annular shell (1). A support (705) connected to the micro fan (5) is fixedly arranged on the rotating plate (704).

2. The on-line monitoring and alarming device for harmful gases in the engineering environment according to claim 1, characterized in that, A groove (202) communicating with the annular shell (1) is formed in the collecting pipe (2). An arc-shaped partition plate (7041) for blocking the groove (202) is fixedly arranged on the rotating plate (704).

3. An on-line monitoring and alarming device for harmful gases in engineering environment air according to claim 2, characterized in that, The cleaning component includes a pneumatic pipe (8) fixedly arranged inside the installation shell (6). The pneumatic pipe (8) and the central axis of the rotating rod (701) are on the same straight line, and the pneumatic pipe (8) is sleeved outside the rotating rod (701). A piston (801) is slidably connected between the inner wall of the pneumatic pipe (8) and the outer wall of the rotating rod (701). An intake valve and an exhaust valve are arranged on the pneumatic pipe (8). The pneumatic pipe (8) is connected to an intake pipe (802) communicating with the inner cavity of the collecting pipe (2) through the intake valve. The pneumatic pipe (8) is connected to an exhaust pipe (803) through the exhaust valve. One end of the exhaust pipe (803) far away from the pneumatic pipe (8) passes through the collecting pipe (2) and is connected to a guide pipe (804). A plurality of spray heads (9) are arranged at equal intervals on the guide pipe (804).

4. An on-line monitoring and alarming device for harmful gases in engineering environment air according to claim 3, characterized in that, The cleaning component further includes a first reciprocating lead screw (10) fixedly connected to the rotating rod (701). A first sleeve (1001) is threadedly connected to the first reciprocating lead screw (10). A push rod (1002) is fixedly arranged on the first sleeve (1001). One end of the push rod (1002) far away from the first sleeve (1001) passes through the pneumatic pipe (8) and is connected to the piston (801).

5. An on-line monitoring and alarming device for harmful gases in the engineering environment according to claim 4, characterized in that, A rotating tube (11) is rotatably connected inside the collection tube (2). The spraying head (9) is rotatably connected to the rotating tube (11) through a pin shaft. A torsion spring for driving the spraying head to rotate back to its original position is arranged on the pin shaft. The spraying head (9) includes a spraying head main body (901) rotatably connected to the rotating tube (11) and a connecting hose (902) connected between the spraying head main body (901) and the air guide tube (804). A driven gear (111) is arranged at the top of the rotating tube (11). A rack plate (112) is meshed and connected to the outside of the driven gear (111). A connecting rod (113) is arranged between the first sleeve (1001) and the rack plate (112).

6. The on-line monitoring and alarming device for harmful gases in the engineering environment according to claim 5, characterized in that, A connecting seat (12) is fixedly arranged on the outside of the rotating tube (11). The air guide tube (804) is slidably connected to the connecting seat (12). A winding drum (13) is arranged on the rotating tube (11). A pulling rope (131) is wound and connected to the winding drum (13). One end of the pulling rope (131) far away from the winding drum (13) passes through the collection tube (2) and is connected to the top of the air guide tube (804).

7. An on-line monitoring and alarming device for harmful gases in the engineering environment according to claim 6, characterized in that, A second reciprocating lead screw (14) is rotatably connected inside the collection tube (2). An active gear (141) meshed with the driven gear (111) is arranged at the top of the second reciprocating lead screw (14). The active gear (141) adopts a flywheel structure. A second sleeve (142) is threadedly connected to the second reciprocating lead screw (14). An abutting block (143) that abuts against the filter screen (201) movably is rotatably connected to the second sleeve (142). A side plate (15) is fixedly arranged on the rotating tube (11). A guide rod (151) that slidably connects with the abutting block (143) is fixedly arranged on the side plate (15).

8. An on-line monitoring and alarming device for harmful gases in the engineering environment air according to claim 1, characterized in that, The air monitoring assembly (301) includes a smoke sensor, an alcohol sensor, a carbon dioxide sensor, and a carbon monoxide sensor. The air monitoring assembly (301) is electrically connected to the circuit board (601).

9. A monitoring method for the on-line monitoring and alarm device for harmful gases in the engineering environment according to claim 7, characterized in that, It also includes the following steps: S1: Control the micro fan (5) to operate. The micro fan (5) sucks air through the opening at the end of the collection tube (2). The sucked air enters the detection tube (3) after being filtered by the filter screen (201) to remove impurities. The air monitoring assembly (301) in the detection tube (3) detects harmful gases in the air, and the detected air is discharged from the other opening of the collection tube (2). S2: As the micro fan (5) continuously works, the air flow sensor (4) detects that the air flow rate entering the collection tube (2) decreases to a preset value, and impurities accumulate on the filter screen (201) at the air inlet opening of the collection tube (2). Control the driving motor (706) to operate. The output shaft of the driving motor (706) drives the rotating rod (701) to rotate. The main bevel gear (702) on the rotating rod (701) meshes and drives with the bevel gear ring (703). The bevel gear ring (703) drives the micro fan (5) to move through the rotating plate (704). The micro fan (5) moves along the annular shell (1), so that the micro fan (5) moves from the original air inlet port position of the collection tube (2) to the original air outlet port position. S3: When the rotating rod (701) rotates, it drives the first reciprocating lead screw (10) to rotate. The first sleeve (1001) reciprocates axially along the first reciprocating lead screw (10). The first sleeve (1001) drives the piston (801) to reciprocate in the pneumatic tube (8) through the push rod (1002). The pneumatic tube (8) sucks the air in the collection tube (2) through the intake pipe (802) and discharges the air to the air guide pipe (804) through the outlet pipe (803). The air guide pipe (804) discharges the air towards the filter screen (201) through the nozzle head (9), causing the dust and impurities attached to the filter screen (201) at the original air intake opening to fall off; S4: After the position of the micro fan (5) is adjusted, the original air outlet opening of the collection tube (2) becomes the air intake opening. The dust and impurities that have fallen at the original air intake opening are blown away by the airflow discharged from the current air outlet opening, so that the fallen dust and impurities will not be sucked by the collection tube (2) again, improving the subsequent air collection speed of the collection tube (2); S5: When the harmful gas in the air detected by the detection tube (3) is excessive, the display screen (602) on the installation shell (6) displays the monitoring information and gives an early warning through the speaker (603).

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