Portable carbon monoxide detection device and control method

Abstract

The invention discloses a portable carbon monoxide detection device and a control method, and relates to the technical field of carbon monoxide detection.The portable carbon monoxide detection device comprises a carbon monoxide detector, a shell of the carbon monoxide detector is fixedly connected with fixing blocks symmetrically distributed along the carbon monoxide detector, and a sliding frame is slidably connected between the symmetrically distributed fixing blocks; the sliding frame is fixedly connected with a rectangular blocking frame, the side, close to the rectangular blocking frame, of the sliding frame is fixedly connected with a flow guide frame, and the flow guide frame is rotationally connected with rotating plates symmetrically distributed along the flow guide frame. On the premise that the normal detection function of the carbon monoxide detector is not affected, the rectangular blocking frame is used for blocking strong wind and large-particle sand and stones, the flow guide frame and the rotating plate are used for guiding the strong wind away from the front side and the rear side, and the filter screen of the annular blocking frame is used for filtering small-particle-size sand and dust; and internal and external parts of the carbon monoxide detector are prevented from being damaged due to strong wind power and dust influence, and the detection performance and the service life of the carbon monoxide detector are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon monoxide detection, and in particular to a portable carbon monoxide detection device and a control method. Background Art

[0002] Currently, the carbon monoxide detection devices on the market are mainly composed of sensors, circuit boards, shells, etc. These devices can effectively detect carbon monoxide concentrations under normal conditions, but in harsh outdoor environments, especially in areas with strong winds and more dust, existing detection devices have many problems.

[0003] Strong winds and large sand and gravel will directly hit the detection port, causing damage to the detection parts, affecting the detection accuracy and service life. The existing detection device lacks effective wind and sand blocking measures and cannot maintain a stable working state under strong wind conditions. If the detection device fails due to damaged parts, the carbon monoxide concentration cannot be detected in time, increasing safety hazards. In addition, dust and fine sand and gravel will enter the detection device and block the sensor and circuit board. The accumulation of sand and dust will cause the sensor sensitivity to decrease, resulting in inaccurate detection results or even complete failure, seriously affecting the performance and life of the detection device.

[0004] To this end, the present invention requires a portable carbon monoxide detection device and a control method, which can achieve the effect of resisting wind and sand without affecting the normal detection function of the carbon monoxide detector. Summary of the invention

[0005] In order to overcome the shortcomings of existing carbon monoxide detection devices that lack effective wind and sand barrier measures, the present invention provides a portable carbon monoxide detection device and a control method.

[0006] A portable carbon monoxide detection device comprises a carbon monoxide detector, wherein a housing of the carbon monoxide detector is fixedly connected with fixed blocks symmetrically distributed along the carbon monoxide detector, the housing of the carbon monoxide detector is fixedly connected with a fixed frame, a cavity is arranged at the bottom of the fixed frame, a sliding frame is slidably connected between the symmetrically distributed fixed blocks, a first elastic telescopic rod is fixedly connected between the fixed blocks and the sliding frame, the sliding frame is fixedly connected with a rectangular blocking frame, a side of the sliding frame close to the rectangular blocking frame is fixedly connected with a guide frame, the guide frame is rotatably connected with a rotating plate symmetrically distributed along the guide frame, the fixed frame is fixedly connected with a cleaning brush, the fixed frame is fixedly connected with a motor, the output shaft of the motor is fixedly connected with an annular blocking frame, the annular blocking frame is provided with a filter screen evenly distributed along the circumferential direction, the filter screen of the annular blocking frame contacts with the surface of the cleaning brush when rotating, a discharge port is arranged between adjacent filter screens of the annular blocking frame, and the annular blocking frame is connected with the cavity at the bottom of the fixed frame through the discharge port.

[0007] As an improvement of the above solution, a variable distance blocking frame is further included, wherein the variable distance blocking frame is slidably connected to the sliding frame, and a second elastic telescopic rod is fixedly connected between the variable distance blocking frame and the guide frame.

[0008] As an improvement of the above solution, a side of the fixing block close to the fixing frame is arranged as an inclined surface, and the variable distance blocking frame is pressed and matched with the inclined surface of the fixing block adjacent to the same side.

[0009] As an improvement of the above scheme, it also includes a pull rod, which is slidably connected to the guide frame, and the pull rod is extruded and matched with the inclined surface of the adjacent fixed block on the same side. A third elastic telescopic rod is fixedly connected between the guide frame and the pull rod, and the variable distance blocking frame and the pull rod are movably connected to the rotating plate on the adjacent side through a movable groove.

[0010] As an improvement of the above scheme, it also includes a material storage rack, which is hinged to the bottom of the fixed frame, the material storage rack is embedded in the bottom of the carbon monoxide detector housing, the material storage rack is communicated with the cavity of the fixed frame, and a plurality of first baffle plates inclined to one side are fixedly connected to the material storage rack.

[0011] As an improvement of the above scheme, it also includes two material guide blocks, which are fixed in the cavity of the fixing frame, and one of the material guide blocks is rotatably connected to a second material baffle plate, and the second material baffle plate is used to block the gap between the two material guide blocks.

[0012] As an improvement of the above solution, a knob is also included, which is rotatably connected to the bottom of the carbon monoxide detector housing and is used to lock the material storage rack.

[0013] A portable carbon monoxide detection control method comprises the following steps:

[0014] S1: Hold the portable carbon monoxide detector correctly, with the display facing upwards and the control buttons facing downwards, and use the detection port to detect the carbon monoxide content in the air;

[0015] S2: If the carbon monoxide detector is used for detection in a windy and sandy area, the angle of the rotating plate is adjusted to resist the strong wind in strong wind weather;

[0016] S3: The large-sized sand and gravel blown by the strong wind are blocked by the rectangular blocking frame, and the small-sized sand and dust are filtered on the filter screen of the annular blocking frame to resist the sand and gravel;

[0017] S4: When the filter on the far left of the annular barrier frame is densely covered with sand and dust so that the air cannot smoothly reach the detection port, the motor is started at this time to brush off the sand and dust on the filter, and the brushed dust is collected into the cavity at the bottom of the fixed frame through the discharge port.

[0018] The present invention has the following advantages: under the premise of not affecting the normal detection function of the carbon monoxide detector, the present invention blocks strong winds and large particles of sand and gravel through a rectangular blocking frame, guides strong winds away from the front and back sides through a guide frame and a rotating plate, and filters small-size sand and dust through a filter screen of the annular blocking frame, thereby preventing the internal and external parts of the carbon monoxide detector from being damaged by strong winds and dust, and improving the detection performance and service life of the carbon monoxide detector.

[0019] The present invention drives the filter screen of the annular barrier frame to rotate and switch through a motor, so that the clean filter screen rotates and switches to the air outlet, and the densely blocked filter screen rotates away from the air outlet and is cleaned by a cleaning brush during the rotation process, so that the sand and dust on the filter screen are brushed off, and the brushed off dust is collected into the cavity at the bottom of the fixed frame through the discharge port, thereby realizing the reuse of the annular barrier frame and the automatic cleaning and collection of sand and dust.

[0020] When the wind force increases, the variable-pitch blocking frame of the present invention automatically slides to the rectangular blocking frame to be offset, thereby reducing the gap, and at the same time, the rotating plate is pushed to automatically swing, so as to achieve the effect of automatically guiding the strong wind to the front and rear sides, preventing the strong wind from gathering at the detection port of the carbon monoxide detector, so as to enhance the wind resistance. When the wind force decreases, the gap is increased, and at the same time, the rotating plate is pushed to swing in the opposite direction and reset, so that the air can be guided to the detection port of the carbon monoxide detector, that is, the size of the air outlet can be automatically and adaptively adjusted according to the change of wind force.

[0021] The present invention provides a material storage rack so that dust entering the cavity of the fixed rack will flow into the material storage rack to achieve the effect of storing sand and stone. The first material baffle plate is provided to prevent the dust in the material storage rack from flowing back into the cavity of the fixed rack when the device is held incorrectly for detection. The material guide block and the second material baffle plate are provided to prevent the dust in the cavity of the fixed rack from flowing back onto the annular blocking rack when the device is held incorrectly for detection.

[0022] The present invention locks the material storage rack by a knob, and when pouring materials, the knob is rotated so that the knob no longer blocks the material storage rack, and the material storage rack swings downward under the action of gravity, so that sand and stone can be automatically poured out, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 It is a partial three-dimensional structural cross-sectional view of the present invention.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the carbon monoxide detector, the fixing block, the fixing frame and other components of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the rectangular blocking frame, guide frame, cleaning brush and other components of the present invention.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the rectangular blocking frame, guide frame, rotating plate and other components of the present invention.

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the motor and the annular blocking frame of the present invention.

[0029] Figure 7 It is a three-dimensional structural schematic diagram of the variable-distance arresting frame, the pull rod and other components of the present invention.

[0030] Figure 8 It is a three-dimensional structural schematic diagram of the fixing block, the pull rod and the third elastic telescopic rod and other components of the present invention.

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of the rotating plate, variable pitch blocking frame and pull rod of the present invention.

[0032] Fig.10 It is a three-dimensional structural schematic diagram of the carbon monoxide detector, fixing block, storage rack and other components of the present invention.

[0033] Fig.11 It is a schematic diagram of the three-dimensional structure of the material storage rack and the first material baffle plate of the present invention.

[0034] Fig.12 It is a schematic diagram of the three-dimensional structure of the material guide block, the second material baffle plate and other components of the present invention.

[0035] Fig.13 The figure is a three-dimensional structural diagram of the carbon monoxide detector, the sliding frame, the knob and other components of the present invention.

[0036] In the above drawings: 101-carbon monoxide detector, 102-fixed block, 1021-fixed frame, 103-sliding frame, 104-first elastic telescopic rod, 105-rectangular blocking frame, 106-flow guide frame, 107-rotating plate, 108-cleaning brush, 109-motor, 110-annular blocking frame, 111-discharging port, 201-variable distance blocking frame, 202-second elastic telescopic rod, 203-pull rod, 204-third elastic telescopic rod, 301-material storage rack, 302-first material baffle plate, 401-material guide block, 402-second material baffle plate, 501-knob. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0038] Example 1: A portable carbon monoxide detection device, see attached Figure 1 To Attachment Figure 6 , including a carbon monoxide detector 101, a housing of the carbon monoxide detector 101 is fixedly connected with fixed blocks 102 symmetrically distributed along the front and back of the carbon monoxide detector 101, a fixed frame 1021 is fixedly connected to the left side of the housing of the carbon monoxide detector 101, a cavity is arranged at the bottom of the fixed frame 1021, a sliding frame 103 is slidably connected between the fixed blocks 102 symmetrically distributed along the left and right directions, a first elastic telescopic rod 104 is fixedly connected between the fixed blocks 102 and the sliding frame 103, a rectangular blocking frame 105 is fixedly connected to the middle of the left side of the sliding frame 103, the rectangular blocking frame 105 has gaps distributed at equal intervals, and a flow guide frame 10 is fixedly connected to the side of the sliding frame 103 close to the rectangular blocking frame 105 6. The guide frame 106 is rotatably connected to a rotating plate 107 which is symmetrically distributed along the front and back of the guide frame 106. There are eight rotating plates 107 in total. A cleaning brush 108 is fixedly connected to the interior of the fixed frame 1021. A motor 109 is fixedly connected to the interior of the fixed frame 1021. The output shaft of the motor 109 is fixedly connected to an annular blocking frame 110. The annular blocking frame 110 is rotatably connected to the fixed frame 1021. The annular blocking frame 110 is provided with filter screens uniformly distributed along the circumferential direction. The filter screens of the annular blocking frame 110 are in contact with the surface of the cleaning brush 108 when rotating. A discharge port 111 is provided between adjacent filter screens of the annular blocking frame 110. The annular blocking frame 110 is connected to the cavity at the bottom of the fixed frame 1021 through the discharge port 111.

[0039] When the device is held to detect the carbon monoxide content in the air, the air passes through the gap of the rectangular blocking frame 105, the gap between the rotating plates 107, and the filter screen of the annular blocking frame 110 in sequence, and finally reaches the detection port of the carbon monoxide detector 101, so as to realize the detection function. If the carbon monoxide detector 101 is used for detection in a strong wind and sandy area, in strong wind weather, the angle of the rotating plate 107 is adjusted to make most of the strong wind entering through the rectangular blocking frame 105 be guided to the sliding frame along the guide frame 106 and the rotating plate 107. The front and rear sides of 103 are formed so that a small amount of trace airflow passes through the annular blocking frame 110, thereby preventing strong wind from directly passing through the annular blocking frame 110 to the right and directly reaching the detection port of the carbon monoxide detector 101, thereby preventing the annular blocking frame 110 and the detection port of the carbon monoxide detector 101 from being damaged by force. At the same time, when the wind impacts the sliding frame 103, the wind force increases and causes the sliding frame 103 to slide to the right, and the first elastic telescopic rod 104 stretches. The wind force decreases and causes the first elastic telescopic rod 104 to reset and drive the sliding frame 103 to slide to the left. The sliding frame 103 is moved so that the sliding frame 103 can buffer against strong winds and prevent the sliding frame 103 from being broken by strong winds; the large-sized sand and gravel blown up by the strong wind are blocked outside by the rectangular blocking frame 105, and the small-sized sand and dust are filtered on the filter screen of the annular blocking frame 110 to achieve the effect of resisting sand and gravel. In addition, when the filter screen on the left side of the annular blocking frame 110 is densely covered with sand and dust so that the air cannot smoothly reach the detection port, the motor 109 is started at this time, and the motor 109 controls the annular blocking frame 110 to rotate, so that the filter screen on the left side that is densely blocked is filtered out. The net turns away, and the new filter turns to the left, and the densely blocked filter passes through the cleaning brush 108 during the rotation process, so that the sand and dust on the filter are brushed off, and the brushed dust falls through the discharge port 111 and is collected in the cavity at the bottom of the fixed frame 1021. In this way, it will not affect the normal detection function of the carbon monoxide detector 101, and can avoid the internal and external parts of the carbon monoxide detector 101 from being damaged by strong winds, and can also prevent sand and dust from entering and covering the detection port, thereby improving the detection performance and service life of the carbon monoxide detector 101.

[0040] See attached Figure 7 To Attachment Fig. 9, also includes a variable-distance blocking frame 201, which is slidably connected to the front side of the sliding frame 103, and a side of the sliding frame 103 close to the rectangular blocking frame 105 is provided with equally spaced gaps, and the gap of the rectangular blocking frame 105 is equal to the gap of the sliding frame 103, and the left side of the fixed block 102 is set as an inclined surface, and the variable-distance blocking frame 201 is extruded and matched with the inclined surface of the fixed block 102 on the front side, and a second elastic telescopic rod 202 is fixedly connected between the variable-distance blocking frame 201 and the guide frame 106, and a pull rod 203 is slidably connected to the rear side of the guide frame 106 along the front and rear directions, and the pull rod 203 is extruded and matched with the inclined surface of the fixed block 102 on the rear side, and the variable-distance blocking frame 201 and the pull rod 203 are both movably connected to the rotating plate 107 on the adjacent side through a movable groove, and a third elastic telescopic rod 204 is fixedly connected between the guide frame 106 and the pull rod 203.

[0041] When the wind force increases and the sliding frame 103 moves to the right, the sliding frame 103 drives the variable-pitch blocking frame 201 and the guide frame 106 to move to the right. Under the squeezing effect of the inclined surface of the front fixed block 102, the variable-pitch blocking frame 201 will also slide forward along the sliding frame 103 during the rightward movement. The second elastic telescopic rod 202 is stretched, so that the variable-pitch blocking frame 201 is misaligned with the rectangular blocking frame 105, thereby reducing the gap. In this way, the variable-pitch blocking frame 201 and the rectangular blocking frame 105 work together to prevent the air flow from flowing. , which can enhance the wind resistance. At the same time, the guide frame 106 drives the pull rod 203 to move to the right. When the pull rod 203 moves to the right, it will also be squeezed by the inclined surface on the left side of the fixed block 102, so that the pull rod 203 will also move backward. The third elastic telescopic rod 204 is stretched. At the same time, the variable-pitch barrier frame 201 and the pull rod 203 both push the rotating plate 107 to swing automatically through the movable groove, thereby achieving the effect of automatically guiding the strong wind to the front and rear sides, preventing strong wind from gathering at the detection port of the carbon monoxide detector 101.

[0042] When the wind force decreases and the sliding frame 103 moves to the left, the sliding frame 103 drives the variable-pitch blocking frame 201 and the guide frame 106 to move to the left, and the guide frame 106 drives the pull rod 203 to move to the left. The inclined surface of the fixed block 102 no longer squeezes the variable-pitch blocking frame 201 and the pull rod 203, so that the second elastic telescopic rod 202 and the third elastic telescopic rod 204 are reset, and the variable-pitch blocking frame 201 and the pull rod 203 slide in the opposite direction to reset. At the same time, the variable-pitch blocking frame 201 and the pull rod 203 both pull the rotating plate 107 through the movable groove to swing in the opposite direction to reset, so that the air can be guided to the detection port of the carbon monoxide detector 101.

[0043] Example 2: Based on Example 1, see the attached Fig.10 and attached Fig.11, and also includes a storage rack 301, which is hinged to the bottom of the fixed frame 1021, and the storage rack 301 is embedded in the bottom of the shell of the carbon monoxide detector 101. The storage rack 301 is communicated with the cavity of the fixed frame 1021, and eight first baffle plates 302 inclined toward the lower left are fixed in the storage rack 301.

[0044] When the device is held correctly for detection, the display screen of the carbon monoxide detector 101 should face upwards and the control buttons should face downwards. In this way, the dust entering the cavity of the fixing frame 1021 will flow into the storage rack 301 for storage. When the device is held incorrectly for detection, the first baffle plate 302 can prevent the dust in the storage rack 301 from flowing back into the cavity of the fixing frame 1021.

[0045] See attached Fig.12 , and also includes two guide blocks 401, which are fixed in the cavity of the fixing frame 1021, wherein one of the guide blocks 401 is rotatably connected to a second baffle plate 402, and the second baffle plate 402 is used to block the gap between the two guide blocks 401.

[0046] When the device is held correctly for detection, the dust brushed off the annular blocking frame 110 will flow out through the discharge port 111 and will be collected into the cavity of the fixed frame 1021 along the guide block 401 and the second baffle plate 402 in sequence. When the device is held incorrectly for detection, the second baffle plate 402 will swing to block the gap between the two guide blocks 401, preventing the dust in the cavity of the fixed frame 1021 from flowing back onto the annular blocking frame 110.

[0047] See attached Fig.13 , and also includes a knob 501, which is rotatably connected to the bottom of the carbon monoxide detector 101 housing. The knob 501 is used to lock the storage rack 301. When the sand and gravel stored in the storage rack 301 needs to be poured out, the knob 501 is rotated so that the knob 501 no longer blocks the storage rack 301, and the storage rack 301 swings downward under the action of gravity, so that the sand and gravel are automatically poured out.

[0048] Embodiment 3: Based on Embodiment 2, a portable carbon monoxide detection control method comprises the following steps:

[0049] S1: Hold the portable carbon monoxide detector correctly, with the display facing upwards and the control buttons facing downwards, and use the detection port to detect the carbon monoxide content in the air;

[0050] S2: If the carbon monoxide detector 101 is used for detection in a windy and sandy area, the angle of the rotating plate 107 is adjusted to resist the strong wind in strong wind weather;

[0051] S3: The large-sized sand and gravel blown by the strong wind are blocked by the rectangular blocking frame 105, and the small-sized sand and dust are filtered on the filter screen of the annular blocking frame 110 to resist the sand and gravel;

[0052] S4: When the filter on the far left of the annular blocking frame 110 is densely covered with dust and the air cannot smoothly reach the detection port, the motor 109 is started to brush off the dust on the filter. The brushed dust is collected in the cavity at the bottom of the fixed frame 1021 through the discharge port 111.

[0053] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A portable carbon monoxide detection device, characterized in that: The invention comprises a carbon monoxide detector (101), wherein the outer shell of the carbon monoxide detector (101) is fixedly connected with fixed blocks (102) symmetrically distributed along the carbon monoxide detector (101), the outer shell of the carbon monoxide detector (101) is fixedly connected with a fixed frame (1021), a cavity is arranged at the bottom of the fixed frame (1021), a sliding frame (103) is slidably connected between the symmetrically distributed fixed blocks (102), a first elastic telescopic rod (104) is fixedly connected between the fixed blocks (102) and the sliding frame (103), the sliding frame (103) is fixedly connected with a rectangular blocking frame (105), and a flow guide frame (106) is fixedly connected to a side of the sliding frame (103) close to the rectangular blocking frame (105), The guide frame (106) is rotatably connected to a rotating plate (107) symmetrically distributed along the guide frame (106); the fixed frame (1021) is fixedly connected to a cleaning brush (108); the fixed frame (1021) is fixedly connected to a motor (109); the output shaft of the motor (109) is fixedly connected to an annular blocking frame (110); the annular blocking frame (110) is provided with filter screens uniformly distributed along the circumferential direction; the filter screens of the annular blocking frame (110) are in contact with the surface of the cleaning brush (108) when rotating; a discharge port (111) is provided between adjacent filter screens of the annular blocking frame (110); the annular blocking frame (110) is connected to a cavity at the bottom of the fixed frame (1021) through the discharge port (111).

2. A portable carbon monoxide detection device according to claim 1, characterized in that: It also includes a variable distance blocking frame (201), the variable distance blocking frame (201) is slidably connected to the sliding frame (103), and a second elastic telescopic rod (202) is fixedly connected between the variable distance blocking frame (201) and the flow guide frame (106).

3. A portable carbon monoxide detection device according to claim 2, characterized in that: A side of the fixing block (102) close to the fixing frame (1021) is arranged as an inclined surface, and the variable-distance blocking frame (201) is pressed and matched with the inclined surface of the fixing block (102) adjacent to the same side.

4. A portable carbon monoxide detection device according to claim 3, characterized in that: It also includes a pull rod (203), the pull rod (203) is slidably connected to the guide frame (106), the pull rod (203) is extruded and matched with the inclined surface of the adjacent fixed block (102) on the same side, a third elastic telescopic rod (204) is fixedly connected between the guide frame (106) and the pull rod (203), and the variable distance blocking frame (201) and the pull rod (203) are movably connected to the rotating plate (107) on the adjacent side through a movable groove.

5. A portable carbon monoxide detection device according to claim 4, characterized in that: It also includes a material storage rack (301), the material storage rack (301) is hinged to the bottom of the fixed rack (1021), the material storage rack (301) is embedded in the bottom of the shell of the carbon monoxide detector (101), the material storage rack (301) is communicated with the cavity of the fixed rack (1021), and a plurality of first material baffle plates (302) inclined to one side are fixedly connected in the material storage rack (301).

6. A portable carbon monoxide detection device according to claim 5, characterized in that: It also includes two material guide blocks (401), the material guide blocks (401) are fixed in the cavity of the fixing frame (1021), one of the material guide blocks (401) is rotatably connected to a second material blocking plate (402), and the second material blocking plate (402) is used to block the gap between the two material guide blocks (401).

7. A portable carbon monoxide detection device according to claim 6, characterized in that: It also includes a knob (501), which is rotatably connected to the bottom of the housing of the carbon monoxide detector (101), and the knob (501) is used to lock the material storage rack (301).

8. A portable carbon monoxide detection control method, using a portable carbon monoxide detection device as claimed in any one of claims 1 to 7, comprising the following steps: S1: Hold the portable carbon monoxide detector correctly, with the display facing upwards and the control buttons facing downwards, and use the detection port to detect the carbon monoxide content in the air; S2: If the carbon monoxide detector (101) is used for detection in a windy and sandy area, the angle of the rotating plate (107) is adjusted to resist the strong wind in strong wind weather; S3: large-sized sand and gravel blown by strong wind are blocked outside by the rectangular blocking frame (105), and small-sized sand and dust are filtered on the filter screen of the annular blocking frame (110) to resist sand and gravel; S4: When the filter on the far left of the annular blocking frame (110) is densely covered with dust and the air cannot smoothly reach the detection port, the motor (109) is started to brush off the dust on the filter, and the brushed dust falls through the discharge port (111) and is collected in the cavity at the bottom of the fixed frame (1021).

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