Exhaust gas treatment equipment

Abstract

The present invention provides an exhaust gas treatment device that is less affected by constraints such as installation location and can be easily attached to the external pipeline of the object to be treated by opening an exhaust gas inlet. [Solution] A main housing is provided inside the exhaust gas treatment device, a guide cavity is provided inside the main housing that penetrates the main housing, a movable frame 13 that can move left and right is provided inside the guide cavity, two sets of push cavities uniformly distributed left and right are provided inside the movable frame, a replaceable frame that can move forward is provided inside the push cavities, a positioning cavity that opens forward is provided inside the replaceable frame, a filter mesh is provided inside the positioning cavity, an activated carbon filter mesh is provided on the rear end surface of the filter mesh, a base 24 is provided on the lower side of the main housing, a lifting drive shaft 26 is rotatably provided on the upper end surface of the base, a lifting slider 27 is rotatably provided on the outer circumference of the lifting drive shaft, the front end surface of the lifting slider is fixedly connected to the main housing, and a gas introduction pipe is fixedly provided on the rear end surface of the main housing.

Description

Technical Field

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[0001] The present invention relates to the technical field of exhaust gas, and specifically to an exhaust gas treatment device.

Background Art

[0002] The pollutants contained in exhaust gas are numerous in types, very complex in physical and chemical properties, and also different in toxicity. The exhaust gas discharged by burning fuel contains sulfur dioxide, nitrogen oxides, hydrocarbons, etc. Due to different raw materials and processes used in industrial production, various harmful gases and solid wastes containing various components such as heavy metals are discharged.

[0003] In the process of using conventional exhaust gas treatment devices, all are used to treat dust particles and toxic gases in exhaust gas. Therefore, it is necessary to perform sampling detection after treatment. However, in the detection process, it always causes a certain amount of exhaust gas leakage, directly affecting the environment, killing surrounding animals and plants. Since the conventional filter element for exhaust gas filtration needs to be replaced when it reaches a certain service life, it is necessary to turn off the device, and hermetic replacement cannot be achieved, further leading to a decrease in work efficiency.

[0004] And in conventional exhaust gas treatment devices, there is a problem that it is difficult to attach the exhaust gas introduction hole of the exhaust gas treatment device to the external pipeline of the object to be treated due to restrictions on the installation location, etc.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide an exhaust gas treatment device that is not easily affected by restrictions on the installation location, etc., and can easily attach the exhaust gas introduction hole to the external pipeline of the object to be treated.

Means for Solving the Problems

[0006] According to the present invention, a portable exhaust gas treatment apparatus including a main housing comprises the main housing having a guide cavity, a communication hole, and an exhaust gas inlet for introducing external exhaust gas, the guide cavity being provided with a filter mechanism that divides the guide cavity into two, a base being provided below the main housing, a lifting drive shaft being provided above the base that extends vertically and is rotatable about an axis extending vertically, a guide shaft being provided on the base parallel to the lifting drive shaft, and a mechanism being screwed to the outer circumferential surface of the lifting drive shaft and guided by the guide shaft to move up and down. An exhaust gas treatment device is provided, comprising a lifting slider, the lifting slider being connected to the main housing, a storage frame with a storage cavity formed between the main housing and the lifting drive shaft, a gas introduction pipe connecting the main housing and the storage frame, a communication hole communicating with the gas introduction pipe, an exhaust gas introduction hole located on one side of the filter mechanism of the main housing, and a communication hole located on the other side of the filter mechanism of the main housing, and the main housing, the lifting drive shaft and the guide shaft being arranged along the longitudinal direction of the exhaust gas treatment device.

[0007] Furthermore, in an embodiment of the present invention, a movable frame is provided within the guide cavity that is horizontally movable between a first position and a second position along a width direction perpendicular to the longitudinal direction, a replaceable frame is provided within the movable frame that is detachable from the movable frame, a filter mechanism is provided within the replaceable frame, the filter mechanism has two filters arranged along the width direction, when the movable frame moves to the first position one of the filters divides the guide cavity into two, and when the movable frame moves to the second position the other of the filters divides the guide cavity into two.

[0008] Furthermore, in the embodiment of the present invention, screw holes are formed on both sides of the movable frame in the width direction, passing through the replacement frame and the movable frame, screws are screwed into the screw holes, and the replacement frame is screwed into the screws.

[0009] Furthermore, in the embodiment of the present invention, a moving motor is provided inside the main housing, a movable shaft rotatable about an axis extending along the width direction is provided below the main housing, a horizontally movable movable slider is screwed onto the outer circumferential surface of the movable shaft, the movable slider is connected to the movable frame and guided by the guide cavity, and the movable shaft is connected to the moving motor.

[0010] Furthermore, in the embodiment of the present invention, the upper end surface of the main housing is provided with two pneumatic telescopic rods that are symmetrical in the width direction and capable of retracting and extending, and the tips of the pneumatic telescopic rods are provided with a pair of contact frames that face each other, and when the pneumatic telescopic rods are retracted, the pair of contact frames cover one or the other of the filters, and when the pneumatic telescopic rods are extended, one or the other of the filters are exposed from the pair of contact frames.

[0011] Furthermore, in the embodiment of the present invention, a controller is provided above the base, a lifting motor is provided inside the base, and the lower end of the lifting drive shaft is connected to the lifting motor.

[0012] Furthermore, in the embodiment of the present invention, a feed frame is provided on the lower end surface of the storage frame, an entry cavity is provided between the feed frame and the lower end surface of the storage frame, a nozzle is formed on the feed frame that connects the entry cavity and the storage cavity, and a sub-check valve is provided on the nozzle that permits only the flow of gas from the entry cavity to the storage cavity.

[0013] Furthermore, in the embodiment of the present invention, a detection frame communicating with the storage cavity is provided above the storage frame, a detection cavity is formed within the detection frame, a multi-gas detector is provided in the detection cavity, a circulation pipe is provided between the detection frame and the main housing for communicating the detection frame and the main housing located on one side of the filter mechanism, a main check valve is provided at one end of the circulation pipe communicating with the main housing, a main check valve is provided at the other end of the circulation pipe communicating with the upper end surface of the detection frame, an exhaust pipe for discharging gas to the outside is provided at the upper end surface of the detection frame, and the detection frame is provided with a switching mechanism that switches between a first state in which the communication between the detection cavity and the exhaust pipe is blocked and the communication between the detection cavity and the circulation pipe is opened, and a second state in which the communication between the detection cavity and the exhaust pipe is opened and the communication between the detection cavity and the circulation pipe is blocked.

[0014] Furthermore, in the embodiment of the present invention, the exhaust gas treatment device further comprises a controller that controls the switching of the switching mechanism, wherein when the exhaust gas content detected by the multi-gas detector reaches a standard value, the controller controls the switching mechanism to switch to a second state, and when the exhaust gas content detected by the multi-gas detector does not reach a standard value, the controller controls the switching mechanism to switch to a first state.

[0015] Furthermore, in an embodiment of the present invention, the switching mechanism includes a rotating frame provided on the upper end surface of the detection frame so as to be rotatable about an axis extending in the vertical direction, and a power motor provided on the upper end surface of the detection frame so as to rotate the rotating frame. [Effects of the Invention]

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. In this invention, the lifting motor is activated to drive the lifting drive shaft to rotate, thereby driving the lifting slider and main housing to move upward. When a predetermined height is reached, the exhaust gas inlet hole of the main housing is connected (specifically, by welding) to the fixed external conduit of the object to be processed, thereby ensuring that the mounting device can reach the predetermined height, thus ensuring convenience during subsequent use, and further ensuring the flexibility and practicality of the device.

[0018] 2. In this invention, by rotating the screw on the left side, the screw separates from the replacement frame, and the pneumatic telescopic rod on the left side begins to extend, driving the contact frame to move upward. Subsequently, the replacement frame and filter can be directly removed, enabling replacement during operation. The rear end surface of the contact frame comes into contact with the moving frame and main housing, ensuring that a sealed state is always maintained during the replacement process of subsequent replacement frames. Furthermore, this improves upon the conventional problem of having to turn off the device for replacement, thus ensuring the practicality of the device.

[0019] 3. The exhaust gas processed by the present invention enters the detection cavity, and at this time, the exhaust gas content is detected by a multi-gas detector. If it reaches a predetermined threshold, the power motor is activated, driving the rotating frame to rotate 90 degrees counterclockwise. At this time, the exhaust gas is discharged to the outside through the exhaust pipe. If it is detected as unacceptable, the power motor is activated in the reverse direction, driving the rotating frame to rotate 90 degrees clockwise. At this time, air passes through the circulation pipe, enters the main check valve, and then recirculates into the main housing for repeated processing. This ensures that the exhaust gas is processed in stages, thereby ensuring that the exhaust gas is sufficiently and thoroughly purified, reducing environmental pollution by gas, saving on environmental protection expenses, improving the purification efficiency and stability of conventional equipment, further improving the purification quality of industrial exhaust gas, ensuring thorough purification of industrial exhaust gas, and ensuring that the circulating treatment continues until it reaches an acceptable level. [Brief explanation of the drawing]

[0020] [Figure 1] It is a perspective view of the present invention. [Figure 2] It is a left side view of the present invention. [Figure 3] It is a front view of the present invention. [Figure 4] It is a schematic view along A-A in FIG. 3 of the present invention. [Figure 5] It is a schematic view along B-B in FIG. 2 of the present invention. [Figure 6] It is a partially enlarged schematic view of the storage frame member in FIG. 4 of the present invention. [Figure 7] It is a partially enlarged schematic view of the replacement frame member in FIG. 4 of the present invention. [Figure 8] It is an external view of the rotating frame member in FIG. 6 of the present invention.

Embodiments for Carrying Out the Invention

[0021] Hereinafter, while referring to the drawings in the embodiments of the present invention, the technical means in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained on the premise that those skilled in the art do not perform creative labor all belong to the protection scope of the present invention.

[0022] As shown in Figures 1 to 8, the highly sealed exhaust gas treatment device according to an embodiment of the present invention is portable. The exhaust gas treatment device includes a main housing 11. The main housing 11 has a guide cavity 12, a communication hole, and an exhaust gas inlet hole into which external exhaust gas is introduced. The guide cavity 12 is provided with a filter mechanism that divides the guide cavity 12 into two parts. Below the main housing 11 is a base 24, and above the base 24 is a lifting drive shaft 26 that extends along the vertical direction and is rotatable about an axis extending in the vertical direction. A guide shaft 47 is provided on the base 24 so as to be parallel to the lifting drive shaft 26, and a lifting slider 27 is provided that is screwed to the outer circumferential surface of the lifting drive shaft 26 and is guided by the guide shaft 47 to move up and down. The lifting slider 27 is connected to the main housing 11, and a storage frame 29 with a storage cavity 31 is provided between the main housing 11 and the lifting drive shaft 26. A gas introduction pipe 28 is provided between the main housing 11 and the storage frame 29 to connect the main housing 11 and the storage frame 29, and a communication hole communicates with the gas introduction pipe 28. The exhaust gas introduction hole is located on one side of the filter mechanism of the main housing 11, and the communication hole is located on the other side of the filter mechanism of the main housing 11. The main housing 11, the lifting drive shaft 26, and the guide shaft 47 are arranged along the longitudinal direction of the exhaust gas treatment device.

[0023] Within the guide cavity 12, a movable frame 13 is provided that can move horizontally between a first position and a second position along the width direction perpendicular to the longitudinal direction. Within the movable frame 13, a replaceable frame 15 is provided that can be attached to and removed from the movable frame 13. Within the replaceable frame 15, a filter mechanism is provided. The filter mechanism has two filters arranged along the width direction. When the movable frame 13 moves to the first position, one filter divides the guide cavity 12 into two parts. When the movable frame 13 moves to the second position, the other filter divides the guide cavity 12 into two parts. Within the movable frame 13, two push cavities 14 are provided, uniformly distributed to the left and right. The replaceable frame 15 is provided within the push cavities 14. A positioning cavity 16 is provided within the replaceable frame 15, and the filter mechanism is provided within the positioning cavity 16. Each filter constituting the filter mechanism has a filter mesh 17 for filtering particulate dust and an activated carbon filter mesh 19 that plays a role in absorbing off-odors. The filter screen 17 and the activated carbon filter screen 19 are stacked on top of each other.

[0024] Screw holes 43 are formed on both sides of the movable frame 13 in the width direction, passing through the replacement frame 15 and the movable frame 13. Screws 44 are screwed into the screw holes 43, and the replacement frame 15 is screwed into the screws 44. This allows the screws 44 to be rotated, which detaches the screws 44 from the replacement frame 15, enabling quick replacement of the replacement frame 15 and the filter inside the replacement frame 15.

[0025] A moving motor 46 is provided inside the main housing 11. Below the main housing 11, a movable shaft 42 is provided that is rotatable around an axis extending in the width direction. A movable slider 18 that is capable of horizontal movement is screwed onto the outer surface of the movable shaft 42. The movable slider 18 is connected to a movable frame 13 and guided by a guide cavity 12. The movable shaft 42 is connected to the moving motor 46. As a result, the moving motor 46 is activated to drive the movable shaft 42 to rotate, and drives the movable slider 18 and the movable frame 13 to move in the width direction.

[0026] The upper end surface of the main housing 11 is provided with two pneumatic telescopic rods 21 that are symmetrical in the width direction and capable of extending and retracting. The tips of the pneumatic telescopic rods 21 are provided with a pair of contact frames 23 that face each other. When the pneumatic telescopic rods 21 are retracted, the pair of contact frames 23 cover one or the other filter, and when the pneumatic telescopic rods 21 are extended, one or the other filter is exposed from the pair of contact frames 23.

[0027] A controller 22 is provided above the base (24), and a lifting motor 25 is provided inside the base 24. The lower end of the lifting drive shaft 26 is connected to the lifting motor 25. As a result, when the lifting motor 25 is activated, the lifting drive shaft 26 is driven to rotate, and the lifting slider 27 and the main housing 11 are driven to move up and down, thereby adjusting the height of the main housing 11 (specifically, the exhaust gas inlet).

[0028] A feed frame 32 is provided on the lower end surface of the storage frame 29, and an entry cavity 33 is provided between the feed frame 32 and the lower end surface of the storage frame 29. A nozzle 34 is formed on the feed frame 32 that connects the entry cavity 33 and the storage cavity 31, and a sub-check valve 35 is provided on the nozzle 34 that allows gas to flow only from the entry cavity 33 to the storage cavity 31.

[0029] Above the storage frame 29, a detection frame 36 is provided that communicates with the storage cavity 31. A detection cavity 40 is formed inside the detection frame 36, and a multi-gas detector 37 is provided in the detection cavity 40. Between the detection frame 36 and the main housing 11, a circulation pipe 45 is provided to connect the detection frame 36 and the main housing 11, which is located on one side of the filter mechanism. At one end of the circulation pipe 45 that communicates with the main housing 11, a main check valve 30 is provided that allows gas to flow only from the circulation pipe 45 to the main housing 11. The other end of the circulation pipe 45 is connected to the upper end surface of the detection frame 36, and an exhaust pipe 39 for discharging gas to the outside is provided on the upper end surface of the detection frame 36. The detection frame 36 is provided with a switching mechanism that switches between a first state in which the communication between the detection cavity 40 and the exhaust pipe 39 is blocked and the communication between the detection cavity 40 and the circulation pipe 45 is opened, and a second state in which the communication between the detection cavity 40 and the exhaust pipe 39 is opened and the communication between the detection cavity 40 and the circulation pipe 45 is blocked. Here, the switching mechanism includes a rotating frame 41 provided on the upper end surface of the detection frame 36 so as to be rotatable around an axis extending in the vertical direction, and a power motor 38 provided on the upper end surface of the detection frame 36 so as to rotate the rotating frame 41. As a result, when the power motor 38 is started, the rotating frame 41 is driven to rotate, thereby controlling the roles of circulation and discharge.

[0030] Specifically, the controller 22 further controls the switching of the switching mechanism. When the exhaust gas content detected by the multi-gas detector 37 reaches a standard value, the controller 22 controls the switching mechanism to switch to the second state. On the other hand, when the exhaust gas content detected by the multi-gas detector 37 does not reach a standard value, the controller 22 controls the switching mechanism to switch to the first state.

[0031] The operation flow of the exhaust gas treatment apparatus of the present invention is as follows.

[0032] During operation, the user controls the controller 22 to activate the lifting motor 25, which drives the lifting drive shaft 26 to rotate, thereby driving the lifting slider 27 and the main housing 11 to move upward. When the predetermined height is reached, the exhaust gas inlet hole of the main housing 11 is connected (specifically, welded) to the fixed external conduit 20, thereby ensuring that the mounting device can reach the predetermined height, thus ensuring convenience for subsequent use, and further ensuring the flexibility and practicality of the device.

[0033] At this time, exhaust gas is introduced from the external conduit 20, enters the guide cavity 12, and passes through the filter screen 17, filtering and adsorbing dust particles in the exhaust gas. At this time, the exhaust gas passes through the activated carbon filter screen 19, which provides secondary treatment for irritating odors in the exhaust gas. The treated exhaust gas enters the gas introduction pipe 28, passes through the gas introduction pipe 28 and enters the entry cavity 33. At this time, due to the increase in air pressure, it enters the nozzle 34 from the auxiliary check valve 35 and is injected into the air purification liquid. At this time, the exhaust gas is adsorbed and treated, and the treated exhaust gas enters the detection cavity 40, where the exhaust gas content is detected by the multi-gas detector 37. If the detected exhaust gas content reaches a predetermined standard value (i.e., the exhaust gas content falls below the threshold), the rotating frame 41 is driven by the power motor 38 to rotate it 90 degrees counterclockwise. The treated gas is then discharged to the outside through the exhaust pipe 39. On the other hand, if the detected exhaust gas content does not reach a predetermined standard value (i.e., the exhaust gas content is above the threshold), that is, if it is detected as unacceptable, the power motor 38 drives the rotating frame 41 to rotate 90 degrees clockwise. The gas then passes through the circulation pipe 45, enters the main check valve 30, and then recirculates into the main housing 11 for repeated processing. This ensures that the exhaust gas is purified thoroughly and completely, reduces environmental pollution by the gas, saves on environmental protection expenses, improves the purification efficiency and stability of conventional equipment, further improves the purification quality of industrial exhaust gas, ensures thorough purification of industrial exhaust gas, and ensures that the circulation process continues until it meets the required standard.

[0034] When the filter screen 17 and activated carbon filter screen 19 reach the end of their service life, the moving shaft 42 is driven by the moving motor 46 to rotate it, which drives the moving slider 18 and moving frame 13 to move to the left. During the movement process, the filter screens 17 and activated carbon filter screens 19 on both the left and right sides are replaced during the operation, so as not to affect the progress and efficiency of exhaust gas treatment, and once the replacement is complete, the screw 44 on the left side is rotated, and as the screw 44 separates from the replacement frame 15, the pneumatic telescopic rod 21 on the left side begins to extend, which drives the contact frame 23 to move upward, and thereafter the replacement frame 15, filter screen 17 and activated carbon filter screen 19 can be directly removed, enabling replacement during operation, and the rear end surface of the contact frame 23 comes into contact with the moving frame 13 and main housing 11, ensuring that a sealed state is always maintained during the replacement process of the subsequent replacement frame 15, and further improving the conventional problem of having to turn off the device for replacement, thereby ensuring the practicality of the device.

[0035] The preferred embodiments of the present invention disclosed herein are for illustrative purposes only. The preferred embodiments do not describe all details, and the invention is not limited to the specific embodiments described herein. Clearly, many modifications and changes can be made based on the content of this specification. These embodiments are selected and described herein specifically to better interpret the principles and practical applications of the present invention and to enable those skilled in the art to better understand and utilize the invention. The present invention is limited only by the claims and their equivalents. [Explanation of symbols]

[0036] 11 Main enclosure 12 Guide Cavity 13 Movement Frames 14 Push Cavity 15 Replacement Frames 16 Positioning Cavity 17 Filtration net 18 Movement Slider 19 Activated carbon filtration net 20 External conduit 21. Pneumatic telescopic rod 22 controllers 23 Contact Frame 24 base 25 Lifting motor 26 Lifting drive shaft 27. Lifting slider 28 Gas inlet pipe 29 Storage Frame 30 Main check valve 31 Storage Cavities 32 feed frames 33 Entry Cavity 34 nozzles 35. Auxiliary check valve 36 detection frames 37 Multi-gas detector 38 Power motor 39 Exhaust pipe 40 detection cavities 41 rotation frames 42 Movement axis 43 screw holes 44 screws 45 Circulation tube 46 Mobile motor

Claims

1. A portable exhaust gas treatment device including a main housing (11), The main housing (11) has a guide cavity (12), a communication hole, and an exhaust gas inlet hole into which external exhaust gas is introduced. The guide cavity (12) is provided with a filter mechanism that divides the guide cavity (12) into two parts. A base (24) is provided below the main housing (11). Above the base (24), a lifting drive shaft (26) is provided that extends along the vertical direction and is rotatable about an axis extending in the vertical direction. A guide shaft (47) is provided on the base (24) so ​​as to be parallel to the lifting drive shaft (26). A lifting slider (27) is provided that is screwed into the outer circumferential surface of the lifting drive shaft (26) and is guided by the guide shaft (47) and can move up and down. The lifting slider (27) is connected to the main housing (11), Between the main housing (11) and the lifting drive shaft (26), a storage frame (29) is provided, in which a storage cavity (31) is formed. A gas introduction pipe (28) is provided between the main housing (11) and the storage frame (29) to connect the main housing (11) and the storage frame (29). The aforementioned communication hole communicates with the gas introduction pipe (28), The exhaust gas inlet is located on one side of the filter mechanism of the main housing (11), and the communication hole is located on the other side of the filter mechanism of the main housing (11). The main housing (11), the lifting drive shaft (26), and the guide shaft (47) are arranged along the longitudinal direction of the exhaust gas treatment device. An exhaust gas treatment device characterized by the following features.

2. A movable frame (13) is provided within the guide cavity (12) that is horizontally movable between a first position and a second position along the width direction perpendicular to the longitudinal direction. A replaceable frame (15) that can be attached to and detached from the movable frame (13) is provided within the movable frame (13). A filter mechanism is provided within the aforementioned replacement frame (15). The filter mechanism has two filters arranged along the width direction, When the moving frame (13) moves to the first position, one of the filters divides the guide cavity (12) into two parts, and when the moving frame (13) moves to the second position, the other filter divides the guide cavity (12) into two parts. The exhaust gas treatment apparatus according to claim 1.

3. Screw holes (43) are formed on both sides in the width direction of the movable frame (13), passing through the replacement frame (15) and the movable frame (13). A screw (44) is screwed into the screw hole (43). The replacement frame (15) is screwed into the screw (44). The exhaust gas treatment apparatus according to claim 2.

4. A moving motor (46) is provided inside the main housing (11). Below the main housing (11), a movable shaft (42) is provided that is rotatable about an axis extending along the width direction. A horizontally movable slider (18) is screwed onto the outer circumferential surface of the aforementioned movable shaft (42). The movable slider (18) is connected to the movable frame (13) and is guided by the guide cavity (12), The moving shaft (42) is connected to the moving motor (46). The exhaust gas treatment apparatus according to claim 2.

5. Two pneumatic telescopic rods (21) capable of extending and retracting in a widthwise symmetrical manner are provided on the upper end surface of the main housing (11). The tip of the aforementioned pneumatic telescopic rod (21) is provided with a pair of contact frames (23) that face each other. When the pneumatic telescopic rod (21) is retracted, the pair of contact frames (23) cover one or the other filter. When the pneumatic telescopic rod (21) extends, one or the other filter is exposed from the pair of contact frames (23). The exhaust gas treatment apparatus according to claim 2.

6. A controller (22) is provided above the base (24). A lifting motor (25) is provided inside the base (24). The lower end of the lifting drive shaft (26) is connected to the lifting motor (25). The exhaust gas treatment apparatus according to claim 1.

7. A feed frame (32) is provided on the lower end surface of the storage frame (29). An entry cavity (33) is provided between the feed frame (32) and the lower end surface of the storage frame (29). The feed frame (32) has a nozzle (34) that connects the entry cavity (33) and the storage cavity (31). The nozzle (34) is provided with a secondary check valve (35) that allows gas to flow only from the entry cavity (33) to the storage cavity (31). The exhaust gas treatment apparatus according to claim 1.

8. A detection frame (36) is provided above the storage frame (29) and communicates with the storage cavity (31). A detection cavity (40) is formed within the detection frame (36). A multi-gas detector (37) is provided in the detection cavity (40). A circulation pipe (45) is provided between the detection frame (36) and the main housing (11) to connect the detection frame (36) and the main housing (11) located on one side of the filter mechanism. A main check valve (30) is provided at one end of the circulation pipe (45) that communicates with the main housing (11), allowing only gas to flow from the circulation pipe (45) to the main housing (11). The other end of the circulation pipe (45) is in communication with the upper end surface of the detection frame (36), An exhaust pipe (39) for discharging gas to the outside is provided on the upper end surface of the detection frame (36). The detection frame (36) is provided with a switching mechanism that switches between a first state in which communication between the detection cavity (40) and the exhaust pipe (39) is blocked and communication between the detection cavity (40) and the circulation pipe (45) is opened, and a second state in which communication between the detection cavity (40) and the exhaust pipe (39) is opened and communication between the detection cavity (40) and the circulation pipe (45) is blocked. The exhaust gas treatment apparatus according to claim 1.

9. The system further includes a controller (22) that controls the switching of the switching mechanism, When the exhaust gas content detected by the multi-gas detector (37) reaches a standard value, the controller (22) controls the switching mechanism to switch to the second state. If the exhaust gas content detected by the multi-gas detector (37) does not reach the standard value, the controller (22) controls the switching mechanism to switch to the first state. The exhaust gas treatment apparatus according to claim 8.

10. The switching mechanism is A rotating frame (41) is provided on the upper end surface of the detection frame (36) so as to be rotatable about an axis extending in the vertical direction, The system includes a power motor (38) provided on the upper end surface of the detection frame (36) so as to rotate the rotating frame (41), The exhaust gas treatment apparatus according to claim 8.

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