Air quality detector with uniform air flow and detection method

Abstract

The present invention discloses an air quality detector with uniform air flow and a detection method, specifically relating to the technical field of air quality detection, including an installation shell, a detection cylinder, an electric cylinder, and a vertical double-station synchronous displacement detection mechanism; wherein the vertical double-station synchronous displacement detection mechanism includes a vertical displacement pressure sensor, a hinge block, two push shafts, a sleeve rod, a connecting rod, a socket slider, a sliding frame, and an L-shaped strip; it also includes a horizontal double-station synchronous displacement detection mechanism and a limit rotation component. The present invention has the advantages of being able to synchronously achieve precise flow contact detection in a large area vertically and horizontally through the vertical double-station synchronous displacement detection mechanism, greatly reducing the detection dead angle, achieving high-precision detection of uniformly flowing air, and greatly improving the accuracy of air quality detection, thus solving the problems of difficult large-area precise flow contact detection, smaller detection contact range, larger detection dead angle, and poor detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of air quality detection. More specifically, the present invention relates to an air quality detector with uniform air flow and a detection method therefor. Background Art

[0002] The dust sensor in the air quality detector plays an important role. Its main purpose is to monitor the air quality in real time. The dust sensor can monitor the concentration of PM2.5 particles in the air in real time, which is an important indicator for measuring air quality. Users can understand the air quality status at any time and thus take necessary protective measures.

[0003] In the existing published literature, the patent with the patent publication number CN105547950A discloses an air quality detector. The device includes a housing, a particle detector, a gas component detector, an environmental condition detector, an indicating device, and a data processor. It also includes a receiving part, a detection part, and an indicating part. The particle detector is arranged in the detection part, the indicating device is arranged in the indicating part, and the gas component detector, the environmental condition detector, and the data processor are all arranged in the receiving part. The gas component detector is arranged behind the particle detector. This device reasonably arranges the spatial positions of various different detectors to achieve an air quality detector that can detect multiple air quality parameters. However, this patent has the following problems.

[0004] When detecting the concentration of particulate matter in the air, the air flowing into the detection part of the detector needs to achieve the purpose of uniform flow to ensure the accuracy of the detection data. However, the air flow surface with uniform flow is relatively wide, and the internal space of the detector is large. The sensor is in a fixed position, and the inner surface of the detection channel is irregular. It is difficult to perform precise vertical double-station variable-position contact detection according to actual needs, and it is difficult to synchronously achieve precise horizontal variable-position detection. This results in difficulty in achieving large-area precise flow contact detection, a smaller detection contact range, larger detection dead angles, and poor detection accuracy. Therefore, an air quality detector with uniform air flow and a detection method therefor are needed. Summary of the Invention

[0005] To overcome the above-mentioned defects of the prior art, the present invention provides the following technical solutions: an air quality detector with uniform air flow, including an installation shell, a detection cylinder, and an electric cylinder. The detection cylinder is fixed on the inner wall of the installation shell, and the electric cylinder is fixed on one side of the outer wall of the detection cylinder. A vertical double-station synchronous displacement detection mechanism is provided on one side of the electric cylinder; the vertical double-station synchronous displacement detection mechanism includes a vertical displacement pressure sensor fixedly arranged on one side of the electric cylinder. The output end of the electric cylinder is fixedly connected with a hinge block, and two push shafts are fixedly connected to the inner wall of the hinge block. A sleeve rod is rotatably connected to the outer wall of each push shaft; a connecting rod is rotatably connected to the inner wall of the sleeve rod at a position far from the push shaft. One end of the connecting rod is fixedly connected with a socket slider, and the socket slider is slidably connected to a sliding frame. One side of the socket slider is fixedly connected with an L-shaped strip, and one end of the L-shaped strip is fixedly connected with a linkage column. A guiding gear is slidably connected to the outer wall of the linkage column; a cross column is fixedly connected to the bottom end of the linkage column, and a dust sensor is fixedly connected to one end of the cross column; a horizontal double-station synchronous displacement detection mechanism is provided on one side of the sliding frame; a limiting rotation assembly is provided at the top end of the guiding gear.

[0006] Preferably, the vertical displacement pressure sensor is used to sense the extrusion force of the hinge block. The vertical displacement pressure sensor is slidably connected with the hinge block. Both linkage columns are rotatably connected with the detection cylinder. The cross-sectional shape of the linkage column is circular. A displacement distance sensor is fixedly connected to the top end of the outer wall of one of the cross columns, and the displacement distance sensor is fixedly connected with the linkage column; a sliding column is fixedly connected to the top end of the inner wall of the sliding frame, and both socket sliders are slidably connected with the sliding column. One end of the detection cylinder is fixedly communicated with an inhalation pipe, and a negative pressure fan is fixedly installed at one end of the inhalation pipe; the other end of the detection cylinder is fixedly connected with an air flow meter, and one end of the air flow meter is fixedly communicated with an inlet pipe; a wireless controller is fixedly installed on one side of the installation shell.

[0007] During use, air flows at a constant speed along the interior of the detection tube toward the two staggered dust sensor locations. The electric cylinder pushes the hinge block to the left, and the two push shafts respectively drive one end of the two sleeve rods to the left, while the other end of the sleeve rod moves upward and the other end of the other sleeve rod moves downward. The sleeve slider drives the L-shaped bar upward, and the linkage column drives the convex bar to slide up along the inner wall of the guide gear, while the other linkage column slides downward. Simultaneously, the linkage column drives the cross column upward, which drives the dust sensor upward and the other dust sensor downward. When the distance value sensed by the displacement distance sensor matches the value set by the wireless controller, the electric cylinder is activated through the wireless controller. The electric cylinder drives the hinge block to the right, the push shaft drives the bottom end of the sleeve rod to the right, and the sleeve rod drives the connecting rod downward. The other connecting rod moves upward, and the connecting rod drives the sleeve slider downward. The cross column causes the dust sensor to move downward, while the other dust sensor moves upward.

[0008] Preferably, the lateral double-station synchronous displacement detection mechanism includes a support frame fixedly arranged on one side of the sliding frame; the support frame is fixedly connected to the detection cylinder, a bidirectional screw is rotatably connected to the interior of the support frame, a stepper motor is fixedly installed on one end of the support frame, the stepper motor is used to drive the bidirectional screw to rotate, and the outer wall of the bidirectional screw is threadedly connected to two threaded sleeves; the top end of the threaded sleeve and the bottom end of the other threaded sleeve are fixedly connected to a connecting column, one end of each connecting column is fixedly connected to a concave rack, the concave rack is meshed and transmission-connected to a guide gear, and one side of the inner wall of each guide gear is slidably connected to a convex strip, which is fixedly connected to the linkage column; a lateral displacement pressure sensor is fixedly connected to both sides of the outer wall of one of the dust sensors. The two threaded sleeves are both slidably connected to the support frame, and the outer wall of the bidirectional screw has two opposite and symmetrical threads; the outer walls of the two threaded sleeves and the inner wall of the support frame are smooth.

[0009] During the use of the present technology, when one dust sensor moves upward and the other dust sensor moves downward, the wireless controller starts the forward rotation of the stepping motor. The bidirectional screw rotates forward inside the support frame, the distance between the two threaded sleeve blocks becomes larger, the threaded sleeve block drives the connecting column to move rightward, the connecting column drives the concave rack to move rightward, and the other concave rack moves leftward. The guiding gear drives the convex strip to rotate counterclockwise, the convex strip drives the linkage column to rotate counterclockwise, and the other linkage column rotates clockwise. The cross column drives the dust sensor to rotate counterclockwise, and the other dust sensor can rotate clockwise inside the detection cylinder. When the lateral displacement pressure sensor senses the pressure value, the stepping motor is driven to drive the bidirectional screw to reverse, and the bidirectional screw drives the two threaded sleeve blocks to approach each other under the action of the threaded transmission force. The threaded sleeve block drives the connecting column to move leftward, the concave rack drives the guiding gear to rotate clockwise, and the linkage column drives the cross column to rotate clockwise. The cross column drives the dust sensor to rotate clockwise, while the other dust sensor rotates counterclockwise.

[0010] Preferably, the limit rotation assembly includes an annular groove opened at the top end of the guiding gear;

[0011] The inner wall of the annular groove is slidably connected with a guiding column. The outer wall of the guiding column is fixedly connected with a limiting plate. The bottom end of the limiting plate and near its center point is fixedly connected with a support column, and there is a gap between the support column and the guiding gear. The bottom end of the support column is fixedly connected with a limiting disc. Both the limiting disc and the limiting plate are slidably connected with the guiding gear. The bottom end of the limiting disc is fixedly connected with a reinforcing column, and the reinforcing column is fixedly connected with the detection cylinder. The limiting plate and the limiting disc are symmetrically arranged with respect to the guiding gear, and the outer walls of the limiting plate and the limiting disc are smooth surfaces.

[0012] During the use of the present technology, when the linkage column moves vertically, the limiting disc supports the support column, the support column can provide a stable supporting force for the limiting plate, the limiting plate supports the guiding column, and the limiting plate and the limiting disc can perform vertical limiting on the guiding gear to avoid the problem of vertical movement of the guiding gear. The guiding gear will cause the annular groove to rotate along the outer wall of the guiding column, and at the same time, the guiding gear performs limiting and stable rotation between the limiting plate and the limiting disc.

[0013] A detection method, which includes the following steps:

[0014] Step 1: The air flows at a constant speed. Start the negative pressure fan, set a specified flow rate through the air flow meter, and the air flows uniformly into the detection cylinder along the specified flow rate of the air flow meter;

[0015] Step 2: Vertical double-station synchronous displacement detection. The electric cylinder pushes the hinge block to move leftward, the cross column drives the dust sensor to move upward, and the other dust sensor moves downward;

[0016] Step 3: Horizontal double-station synchronous displacement detection. The wireless controller starts the reciprocating rotation of the stepping motor. The cross column drives the reciprocating rotation of the dust sensor, and the other dust sensor can reciprocate inside the detection cylinder, where the reciprocating rotation directions of the two dust sensors are opposite.

[0017] Step 4: Limited rotation. The linkage column moves vertically. The limiting plate and the limiting disk can vertically limit the guiding gear. When the guiding gear rotates, the ring groove rotates along the outer wall of the guiding column.

[0018] Technical effects and advantages of the present invention:

[0019] 1. Through the vertical double-station synchronous displacement detection mechanism of the present invention, the electric cylinder pushes the hinge block to move leftward. The two push shafts drive the left ends of the two sleeve rods to move leftward respectively. The other ends of the sleeve rods move upward, and the other ends of the other sleeve rod move downward. The cross column drives the dust sensor to move upward, while the other dust sensor moves downward inside the detection cylinder. When the distance value sensed by the displacement distance sensor is the same as the value set by the wireless controller, the wireless controller starts the electric cylinder to drive the hinge block to move rightward. The cross column makes the dust sensor move downward, and the other dust sensor moves upward, enabling the two dust sensors to perform vertical double-station synchronous displacement detection under the irregular movement path inside the detection cylinder, achieving large-area vertical precise flow contact detection, with a wider detection contact range, significantly reducing the detection dead angle, achieving high-precision detection of uniformly flowing air, and greatly improving the accuracy of air quality detection.

[0020] 2. By using the horizontal double-station synchronous displacement detection mechanism of the present invention, when one dust sensor moves upward and the other dust sensor moves downward, the wireless controller starts the forward rotation of the stepping motor. The bidirectional screw drives the two threaded sleeve blocks to move away from each other under the action of the thread. The concave rack drives the guiding gear to rotate counterclockwise. The convex strip drives the linkage column to rotate counterclockwise, and the other linkage column rotates clockwise. The dust sensor rotates counterclockwise, and the other dust sensor can rotate clockwise inside the detection cylinder. After the horizontal displacement pressure sensor senses the pressure value, the stepping motor drives the bidirectional screw to reverse. The cross column drives the dust sensor to rotate clockwise, and the other dust sensor rotates counterclockwise, so that the two dust sensors can perform horizontal double-station synchronous displacement detection on the irregular path inside the detection cylinder, achieving large-area horizontal precise flow contact detection, with a wider detection contact range, achieving high-precision detection of uniformly flowing air, and greatly improving the accuracy of air quality detection.

[0021] 3. Through the limit rotation assembly of the present invention, the linkage column moves vertically. The detection cylinder supports and reinforces the column, and the reinforcing column supports the limit disk. The limit plate and the limit disk can vertically limit the guide gear, avoiding the problem of vertical movement of the guide gear. The rotation of the guide gear causes the annular groove to rotate along the outer wall of the guide column. The guide gear is stably rotated and limited between the limit plate and the limit disk, ensuring that the guide gear can not only maintain vertical sliding with the linkage column but also maintain rotational transmission with the linkage column. Furthermore, precise flow contact detection in large areas horizontally and vertically can be achieved.

[0022] Based on the mutual influence of the above-mentioned multiple functions, first, the two dust sensors can perform vertical double-station synchronous displacement detection under the irregular movement path inside the detection cylinder. Second, the two dust sensors can perform horizontal double-station synchronous displacement detection on the irregular path inside the detection cylinder. At the same time, it is ensured that the guide gear can not only maintain vertical sliding with the linkage column but also maintain rotational transmission with the linkage column. In summary, precise flow contact detection in large areas vertically and horizontally can be synchronously achieved, with a wider detection contact range, significantly reducing the detection dead angle, achieving high-precision detection of uniformly flowing air, and greatly improving the accuracy of air quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the air quality detector with uniformly flowing air of the present invention.

[0024] Figure 2 It is a schematic diagram of the split structure of the installation shell and the detection cylinder of the present invention.

[0025] Figure 3 It is a schematic diagram of the main view of the local structure at the connection of the push shaft and the detection cylinder of the present invention.

[0026] Figure 4 It is a schematic diagram of the truncated local structure at the connection of the sleeve rod and the connecting rod of the present invention.

[0027] Figure 5 It is a schematic diagram of the main view of the local vertical section of the detection cylinder of the present invention.

[0028] Figure 6 It is a schematic diagram of the main view of the local structure at the connection of the detection cylinder and the support frame of the present invention.

[0029] Figure 7 It is a schematic diagram of the truncated local structure at the connection of the linkage column and the convex strip of the present invention.

[0030] Figure 8 It is a schematic diagram of the truncated local top view of the cross-section of the linkage column and the detection cylinder of the present invention.

[0031] Figure 9This is the front view structural schematic diagram of the limit rotation component of the present invention.

[0032] The reference numerals are: 1, mounting shell; 2, detection cylinder; 3, electric cylinder; 4, vertical displacement pressure sensor; 5, hinge block; 6, push shaft; 7, sleeve rod; 8, connecting rod; 9, socket slider; 10, L-shaped strip; 11, linkage column; 12, guiding gear; 13, cross column; 14, dust sensor; 15, displacement distance sensor; 16, sliding column; 17, sliding frame; 18, suction pipe; 19, negative pressure fan; 20, air flow meter; 21, inlet pipe; 22, wireless controller; 23, support frame; 24, bidirectional screw; 25, stepper motor; 26, threaded sleeve block; 27, connecting column; 28, concave rack; 29, convex strip; 30, horizontal displacement pressure sensor; 31, annular groove; 32, guiding column; 33, limiting plate; 34, support column; 35, limiting disc; 36, reinforcing column. Specific embodiments

[0033] 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.

[0034] As shown in the attached Figures 1-9 The air quality detector with uniform air flow shown, on which a vertical double-station synchronous displacement detection mechanism, a horizontal double-station synchronous displacement detection mechanism and a limit rotation component are provided. The setting of each mechanism and component can synchronously achieve precise flow contact detection in a large area vertically and horizontally, with a wider detection contact range, greatly reducing the detection dead angle, achieving high-precision detection of uniformly flowing air, and greatly improving the accuracy of air quality detection. The specific structural settings of each mechanism and component are as follows.

[0035] In this technical solution, as shown in the attached Figures 1-4As shown in the figure, a vertical double-station synchronous displacement detection mechanism is provided on one side of the electric cylinder 3; the vertical double-station synchronous displacement detection mechanism includes a vertical displacement pressure sensor 4 fixedly arranged on one side of the electric cylinder 3. The output end of the electric cylinder 3 is fixedly connected with a hinge block 5. Two push shafts 6 are fixedly connected to the inner wall of the hinge block 5. A sleeve rod 7 is rotatably connected to the outer wall of each push shaft 6; a connecting rod 8 is rotatably connected to the inner wall of the sleeve rod 7 at a position far from the push shaft 6. One end of the connecting rod 8 is fixedly connected with a socket slider 9. The outer wall of the socket slider 9 is slidably connected with a sliding frame 17. One side of the socket slider 9 is fixedly connected with an L-shaped strip 10. One end of the L-shaped strip 10 is fixedly connected with a linkage column 11. A guiding gear 12 is slidably connected to the outer wall of the linkage column 11; a cross column 13 is fixedly connected to the bottom end of the linkage column 11. A dust sensor 14 is fixedly connected to one end of the cross column 13; a horizontal double-station synchronous displacement detection mechanism is provided on one side of the sliding frame 17; a limiting rotation assembly is arranged at the top end of the guiding gear 12.

[0036] In this technical solution, as shown in the attached Figures 1-5 figure, a displacement distance sensor 15 is fixedly connected to the top end of the outer wall of one of the cross columns 13. The displacement distance sensor 15 is fixedly connected with the linkage column 11; a sliding column 16 is fixedly connected to the top end of the inner wall of the sliding frame 17. Both socket sliders 9 are slidably connected with the sliding column 16, so that the cross column 13 drives the displacement distance sensor 15 to move upward, so that the two dust sensors 14 can perform vertical double-station synchronous displacement detection, and the socket slider 9 slides upward along the outer wall of the sliding column 16.

[0037] One end of the detection cylinder 2 is fixedly communicated with an inhalation pipe 18. A negative pressure fan 19 is fixedly installed at one end of the inhalation pipe 18; the other end of the detection cylinder 2 is fixedly connected with an air flow meter 20. One end of the air flow meter 20 is fixedly communicated with an inlet pipe 21; a wireless controller 22 is fixedly installed on one side of the installation shell 1, so as to facilitate fixing the installation shell 1 at the air detection position by bolts. The negative pressure fan 19 is started through the wireless controller 22. In this way, the external air is inhaled into the air flow meter 20 through the inlet pipe 21. A specified flow rate is set through the air flow meter 20, so that the air flows into the detection cylinder 2 at a uniform speed according to the specified flow rate of the air flow meter 20, realizing the detection operation.

[0038] In this technical solution, as shown in the attached Figures 4-8 figure, the horizontal double-station synchronous displacement detection mechanism includes a support frame 23 fixedly arranged on one side of the sliding frame 17; the support frame 23 is fixedly connected with the detection cylinder 2. A bidirectional screw 24 is rotatably connected inside the support frame 23. A stepping motor 25 is fixedly installed at one end of the support frame 23. The stepping motor 25 is used to drive the bidirectional screw 24 to rotate. Two threaded sleeve blocks 26 are threadedly connected to the outer wall of the bidirectional screw 24.

[0039] The top and bottom ends of the threaded sleeves 26 and the other threaded sleeve 26 are both fixedly connected to connecting posts 27. Each connecting post 27 is fixedly connected to a concave rack 28 at one end, meshing and drivingly connected to the guide gear 12. Each guide gear 12 has a rib 29 slidably connected to one side of its inner wall, which is fixedly connected to the linkage post 11. A lateral displacement pressure sensor 30 is fixedly connected to both sides of the outer wall of one of the dust sensors 14. Both threaded sleeves 26 are slidably connected to the support frame 23, and the outer walls of the bidirectional screw 24 have opposite and symmetrical threads. The outer walls of both threaded sleeves 26 and the inner wall of the support frame 23 are smooth.

[0040] In this technical solution, as shown in the attached Figures 4-9 As shown, the limited rotation assembly includes an annular groove 31 formed at the top of the guide gear 12; a guide post 32 is slidably connected to the inner wall of the annular groove 31, and a limit plate 33 is fixedly connected to the outer wall of the guide post 32. A support 34 is fixedly connected to the bottom end of the limit plate 33 near its center point, with a gap between the support 34 and the guide gear 12; a limit plate 35 is fixedly connected to the bottom end of the support 34, and both the limit plate 35 and the limit plate 33 are slidably connected to the guide gear 12. A reinforcement post 36 is fixedly connected to the bottom end of the limit plate 35, and the reinforcement post 36 is fixedly connected to the detection cylinder 2. The limit plate 33 and the limit plate 35 are symmetrically arranged about the guide gear 12, and the outer walls of both the limit plate 33 and the limit plate 35 are smooth.

[0041] The working method of the air quality detector of the present invention with uniform air flow is as follows:

[0042] First, when the present invention performs uniform air flow, the mounting housing 1 is first fixed to the air detection position with bolts, and the negative pressure blower 19 is activated by the wireless controller 22. In this way, the inlet pipe 21 draws external air into the interior of the air flow meter 20. The air flow rate is set by the air flow meter 20, and the air flows uniformly along the flow rate specified by the air flow meter 20 into the interior of the detection cylinder 2, and the air quality is detected in the interior of the detection cylinder 2. At the same time, the air is guided along the intake pipe 18 to the position of the negative pressure blower 19, and the negative pressure blower 19 performs the exhaust operation.

[0043] Secondly, when the vertical double-station synchronous displacement detection is carried out in the present invention, the uniformly flowing air will flow along the inside of the detection cylinder 2 towards the positions of the two staggered dust sensors 14. At the same time, the electric cylinder 3 is started through the wireless controller 22. The electric cylinder 3 pushes the hinge block 5 to move leftward. The hinge block 5 drives the two push shafts 6 to move leftward. The two push shafts 6 respectively drive one end of the two sleeve rods 7 to move leftward. The other ends of the sleeve rods 7 move upward, and the other ends of the other sleeve rods 7 move downward. The sleeve rods 7 drive the connecting rod 8 to move upward. The connecting rod 8 drives the socket slider 9 to move upward. The socket slider 9 slides upward along the outer wall of the sliding frame 17. At the same time, the socket slider 9 slides upward along the outer wall of the sliding column 16. The socket slider 9 drives the L-shaped strip 10 to move upward. The L-shaped strip 10 drives the linkage column 11 to move upward. The linkage column 11 drives the convex strip 29 to slide upward along the inner wall of the guiding gear 12, while the other linkage column 11 slides downward.

[0044] At the same time, the linkage column 11 drives the cross column 13 to move upward. The cross column 13 drives the dust sensor 14 to move upward. At the same time, the cross column 13 drives the displacement distance sensor 15 to move upward. In this way, the two dust sensors 14 can perform vertical double-station synchronous displacement detection.

[0045] At the same time, when the horizontal double-station synchronous displacement detection is carried out in the present invention, when one dust sensor 14 moves upward and the other dust sensor 14 moves downward, the stepping motor 25 is started to rotate forward through the wireless controller 22. The stepping motor 25 drives the bidirectional screw 24 to rotate forward. The bidirectional screw 24 rotates forward inside the support frame 23. The bidirectional screw 24 drives the two threaded sleeve blocks 26 to move away from each other under the action of the thread. The distance between the two threaded sleeve blocks 26 becomes larger. One threaded sleeve block 26 moves rightward, and the other threaded sleeve block 26 moves leftward. The threaded sleeve block 26 drives the connecting column 27 to move rightward. The connecting column 27 drives the concave rack 28 to move rightward, and the other concave rack 28 moves leftward. At the same time, the concave rack 28 drives the guiding gear 12 to rotate counterclockwise. The guiding gear 12 drives the convex strip 29 to rotate counterclockwise. The convex strip 29 drives the linkage column 11 to rotate counterclockwise, and the other linkage column 11 rotates clockwise. The linkage column 11 drives the cross column 13 to rotate counterclockwise. The cross column 13 drives the dust sensor 14 to rotate counterclockwise. The dust sensor 14 drives the horizontal displacement pressure sensor 30 to press against the left inner wall of the detection cylinder 2, while the other dust sensor 14 can rotate clockwise inside the detection cylinder 2.

[0046] When the lateral displacement pressure sensor 30 senses the pressure value, the bidirectional screw 24 is driven to reverse by the stepping motor 25. The bidirectional screw 24 drives the two threaded sleeve blocks 26 to approach each other under the action of the threaded driving force. At the same time, one threaded sleeve block 26 moves leftward, and the other threaded sleeve block 26 moves rightward. The threaded sleeve block 26 drives the connecting column 27 to move leftward. The connecting column 27 drives the concave rack 28 to move leftward. The concave rack 28 drives the guiding gear 12 to rotate clockwise. The guiding gear 12 drives the convex strip 29 to make the linkage column 11 rotate clockwise. The linkage column 11 drives the cross column 13 to rotate clockwise. The cross column 13 drives the dust sensor 14 to rotate clockwise, while the other dust sensor 14 rotates counterclockwise. When the dust sensor 14 drives the other lateral displacement pressure sensor 30 to contact the right side of the inner wall of the detection cylinder 2, the stepping motor 25 is started to rotate forward through the wireless controller 22. By continuously driving the stepping motor 25 to rotate forward and backward reciprocally, the two dust sensors 14 can perform lateral double-station synchronous displacement detection on the irregular path inside the detection cylinder 2, realizing lateral large-area precise flow contact detection with a wider detection contact range.

[0047] Meanwhile, when the present invention performs limited rotation, when the linkage column 11 moves vertically, the detection cylinder 2 supports the reinforcement column 36. The reinforcement column 36 supports the limit plate 35. The limit plate 35 supports the support column 34. The support column 34 can provide a stable supporting force for the limit plate 33. And the limit plate 33 supports the guiding column 32. In this way, the limit plate 33 and the limit plate 35 can perform vertical limitation on the guiding gear 12, avoiding the problem of vertical movement of the guiding gear 12. At the same time, when the guiding gear 12 rotates, the guiding gear 12 will make the annular groove 31 rotate along the outer wall of the guiding column 32. Meanwhile, the guiding gear 12 performs limited and stable rotation between the limit plate 33 and the limit plate 35, ensuring that the guiding gear 12 can perform limited rotation at the specified position.

[0048] Finally, during the wireless transmission of the present invention, when the cross column 13 drives the displacement distance sensor 15 to move upward to the top position of the inner wall of the detection cylinder 2, the displacement distance sensor 15 senses the distance to the top of the inner wall of the detection cylinder 2. When the distance value sensed by the displacement distance sensor 15 is the same as the value set by the wireless controller 22, the electric cylinder 3 is activated by the wireless controller 22. The electric cylinder 3 drives the hinge block 5 to move rightward, the hinge block 5 drives the two push shafts 6 to move rightward, the push shafts 6 drive the bottom end of the sleeve rod 7 to move rightward, and the sleeve rod 7 drives the connecting rod 8 to move downward, while the other connecting rod 8 moves upward. The connecting rod 8 drives the socket slider 9 to move downward, and the socket slider 9 drives the L-shaped strip 10 to move the linkage column 11 downward. The linkage column 11 drives the cross column 13 to move downward, the cross column 13 causes the dust sensor 14 to move downward, and the other dust sensor 14 moves upward. When the hinge block 5 moves rightward and touches the vertical displacement pressure sensor 4, the electric cylinder 3 is immediately activated by the wireless controller 22 to continue pushing the hinge block 5 to move leftward. As the output end of the electric cylinder 3 continuously moves left and right reciprocally, the two dust sensors 14 can perform vertical double-station synchronous displacement detection, and vertical double-station detection is achieved reciprocally. For the air flowing uniformly inside the detection cylinder 2, vertical large-area precise flow contact detection is performed, with a wider detection contact range and reduced detection dead angles. The detected particulate matter concentration value is remotely transmitted by the wireless controller 22 to the background monitoring device, and at the same time, the particulate matter concentration value can be displayed on the display screen of the wireless controller 22. Whether the air quality is qualified is judged according to the particulate matter concentration value. If the concentration value exceeds the value set by the wireless controller 22, the air quality is unqualified.

[0049] Contents not described in detail in the specification belong to the well-known prior art in the art, and the model parameters of each electrical appliance are not specifically limited. Conventional equipment can be used. In this technical solution, since the electrical control components not mentioned belong to the prior art, they are not shown in the figure and will not be described here either.

[0050] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air quality detector with uniform air flow, comprising an installation shell, a detection cylinder and an electric cylinder. The detection cylinder is fixed on the inner wall of the installation shell, and the electric cylinder is fixed on one side of the outer wall of the detection cylinder, characterized in that: A vertical double-station synchronous displacement detection mechanism is provided on one side of the electric cylinder; The vertical double-station synchronous displacement detection mechanism includes a vertical displacement pressure sensor fixedly arranged on one side of the electric cylinder, the output end of the electric cylinder is fixedly connected to a hinge block, the inner wall of the hinge block is fixedly connected to two push shafts, and the outer wall of each push shaft is rotatably connected to a sleeve rod; the inner wall of the sleeve rod is rotatably connected to a connecting rod away from the push shaft, one end of the connecting rod is fixedly connected to a sleeve slider, the outer wall of the sleeve slider is slidably connected to a slide frame, one side of the sleeve slider is fixedly connected to an L-shaped bar, one end of the L-shaped bar is fixedly connected to a linkage column, and the outer wall of the linkage column is slidably connected to a guide gear; the bottom end of the linkage column is fixedly connected to a cross column, and one end of the cross column is fixedly connected to a dust sensor; a horizontal double-station synchronous displacement detection mechanism is provided on one side of the slide frame, the horizontal double-station synchronous displacement detection mechanism includes a support frame fixedly arranged on one side of the slide frame; the support frame is fixedly connected to the detection cylinder, and the support frame The internal rotation is connected with a bidirectional screw, and a stepping motor is fixedly installed at one end of the support frame. The stepping motor is used to drive the bidirectional screw to rotate, and the outer wall of the bidirectional screw is threadedly connected to two threaded sleeves; the top end of the threaded sleeve and the bottom end of the other threaded sleeve are fixedly connected to a connecting column, and one end of each connecting column is fixedly connected to a concave rack, which is meshed with a guide gear for transmission connection, and one side of the inner wall of each guide gear is slidably connected with a convex strip, which is fixedly connected to the linkage column; a limited rotation assembly is provided at the top of the guide gear, and the limited rotation assembly includes an annular groove provided at the top of the guide gear; the inner wall of the annular groove is slidably connected with a guide column, and the outer wall of the guide column is fixedly connected to a limiting plate, and the bottom end of the limiting plate and near the center point of the circle are fixedly connected with a pillar, and a gap is provided between the pillar and the guide gear; the bottom end of the pillar is fixedly connected to a limiting disk.

2. The air quality detector with uniform air flow according to claim 1, wherein: The vertical displacement pressure sensor is used to sense the extrusion force of the hinge block, and the vertical displacement pressure sensor is slidably connected to the hinge block.

3. The air quality detector with uniform air flow according to claim 2, characterized in that: The two linkage columns are both rotatably connected to the detection cylinder, and the cross-section of the linkage columns is circular.

4. The air quality detector with uniform air flow according to claim 3, wherein: A displacement distance sensor is fixedly connected to the top of the outer wall of one of the cross columns, and the displacement distance sensor is fixedly connected to the linkage column; The top end of the inner wall of the sliding frame is fixedly connected with a sliding post, and the two sleeve sliding blocks are both slidably connected to the sliding post.

5. The air quality detector with uniform air flow according to claim 4, wherein: One end of the detection cylinder is fixedly connected to a suction pipe, and one end of the suction pipe is fixedly installed with a negative pressure fan; The other end of the detection cylinder is fixedly connected to an air flow meter, and one end of the air flow meter is fixedly connected to an inlet pipe; A wireless controller is fixedly mounted on one side of the mounting shell.

6. The air quality detector with uniform air flow according to claim 5, characterized in that: Lateral displacement pressure sensors are fixedly connected to both sides of the outer wall of one of the dust sensors.

7. The air quality detector with uniform air flow according to claim 6, characterized in that: The two threaded sleeves are both slidably connected to the support frame, and the two threads on the outer wall of the bidirectional screw are opposite and symmetrically arranged; The outer walls of the two threaded sleeves and the inner wall of the support frame are both smooth surfaces.

8. The air quality detector with uniform air flow according to claim 7, characterized in that: The limiting disc and the limiting plate are both slidably connected to the guide gear. The bottom end of the limiting disc is fixedly connected to a reinforcement column, and the reinforcement column is fixedly connected to the detection cylinder.

9. The air quality detector with uniform air flow according to claim 8, characterized in that: The limiting plate and the limiting disk are symmetrically arranged with respect to the guiding gear, and the outer walls of the limiting plate and the limiting disk are both smooth surfaces.

10. A detection method, using the air quality detector with uniform air flow described in claim 9, characterized in that: The method comprises the following steps: Step 1: The air flows uniformly. Start the negative pressure fan, set a specified flow rate through the air flow meter, and the air flows uniformly into the inside of the detection cylinder along the specified flow rate of the air flow meter; Step 2: Vertical double-station synchronous displacement detection. The electric cylinder pushes the hinge block to move leftward, the cross column drives the dust sensor to move upward, and the other dust sensor moves downward; Step 3: Horizontal double-station synchronous displacement detection. The wireless controller starts the stepping motor to rotate reciprocally, the cross column drives the dust sensor to rotate reciprocally, and the other dust sensor rotates reciprocally inside the detection cylinder, wherein the reciprocating rotation directions of the two dust sensors are opposite; Step 4: Limited rotation. The linkage column moves vertically, the limiting plate and the limiting disk perform vertical limitation on the guiding gear, the guiding gear rotates, and the guiding gear causes the annular groove to rotate along the outer wall of the guiding column.

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