Air quality detector and detection method for air flowing at constant speed

Abstract

The invention discloses an air quality detector and a detection method for constant-speed air flowing, and particularly relates to the technical field of air quality detection. The air quality detector comprises a mounting shell, a detection barrel, an electric cylinder and a vertical double-station synchronous displacement detection mechanism; the vertical double-station synchronous displacement detection mechanism comprises a vertical displacement pressure sensor, a hinge block, two push shafts, a sleeve rod, a connecting rod, a sleeving sliding block, a sliding frame and an L-shaped strip. The device further comprises a transverse double-station synchronous displacement detection mechanism and a limiting rotating assembly. The vertical double-station synchronous displacement detection mechanism has the advantages that large-area vertical and transverse accurate flow contact detection can be synchronously realized, detection dead angles are greatly reduced, high-accuracy detection of air flowing at a constant speed is realized, and the air quality detection accuracy is greatly improved; therefore, the problems that large-area accurate flow contact detection is difficult to realize, the detection contact range is smaller, a larger detection dead angle exists, and the detection accuracy is poor are solved.

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 thereof. 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 announcement 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 realize 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 thereof 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 a mounting shell, a detection cylinder, and an electric cylinder. The detection cylinder is fixed on the inner wall of the mounting 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 outer wall of the socket slider is slidably connected with 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 of the two 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 of the two 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 mounting shell.

[0007] During the use of this technology, the uniformly flowing air will flow along the inside of the detection tube to the two staggered dust sensor positions, the electric cylinder pushes the hinge block to move left, the two push shafts drive one end of the two sleeve rods to move left respectively, 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 to move upward, the linkage column drives the convex bar to slide along the inner wall of the guide gear, and the other linkage column slides downward. At the same time, the linkage column drives the cross column to move upward, the cross column drives the dust sensor to move upward, and the other dust sensor moves downward. When the distance value sensed by the displacement distance sensor is the same as the value set by the wireless controller, the electric cylinder is started through the wireless controller, the electric cylinder drives the hinge block to move right, the push shaft drives the bottom end of the sleeve rod to move right, and the sleeve rod drives the connecting rod to move downward, the other connecting rod moves upward, the connecting rod drives the sleeve slider to move downward, the cross column makes the dust sensor move downward, and the other dust sensor moves upward.

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

[0009] During the use of this 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 to the right, the connecting column drives the concave rack to move to the right, and the other concave rack moves to the left. 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 bidirectional screw is driven to reverse by the stepping motor, and the bidirectional screw drives the two threaded sleeve blocks to approach each other under the action of the threaded driving force. The threaded sleeve block drives the connecting column to move to the left, 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; 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 disk, both the limiting disk and the limiting plate are slidably connected with the guiding gear, the bottom end of the limiting disk is fixedly connected with a reinforcing column, and the reinforcing column is fixedly connected with the detection cylinder. 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.

[0011] During the use of this technology, when the linkage column moves vertically, the limiting disk 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 disk 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 disk.

[0012] A detection method, which includes the following steps: 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 into the detection cylinder at a constant speed 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 to the left, 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 can rotate reciprocally inside the detection cylinder, where the reciprocating rotation directions of the two dust sensors are opposite. Step 4: Limited rotation. The linkage column moves vertically. The limit plate and the limit disk can perform vertical limit on the guide gear. When the guide gear rotates, the guide gear will cause the annular groove to rotate along the outer wall of the guide column.

[0013] Technical effects and advantages of the present invention: 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 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 causes the dust sensor to 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. 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 stepping motor to rotate forward. 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 guide gear to rotate counterclockwise, the convex strip drives the linkage column to rotate counterclockwise, 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 rotate reversely. The cross column drives the dust sensor to rotate clockwise, while 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. 3. In the present invention, through the limit rotation assembly, the linkage column moves vertically. The detection cylinder supports and strengthens the column, and the strengthening column supports the limit disc. The limit plate and the limit disc 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 limited and stably rotates between the limit plate and the limit disc, 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, it can achieve precise flow contact detection in a large area horizontally and vertically. Due to the mutual influence of the above 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, it 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the air quality detector with uniform air flow of the present invention.

[0015] Figure 2 It is a schematic diagram of the split structure of the installation shell and the detection cylinder of the present invention.

[0016] 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.

[0017] 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.

[0018] Figure 5 It is a schematic diagram of the main view of the local structure of the vertical section of the detection cylinder of the present invention.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Figure 9 It is a schematic diagram of the main view of the limit rotation assembly of the present invention.

[0023] The reference numerals are: 1, installation 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, guide 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, stepping motor; 26, threaded sleeve block; 27, connecting column; 28, concave rack; 29, convex strip; 30, horizontal displacement pressure sensor; 31, annular groove; 32, guide column; 33, limiting plate; 34, support column; 35, limiting disc; 36, reinforcement column. Specific implementation manners

[0024] 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.

[0025] As shown in the attached Figures 1-9 The air quality detector with uniform air flow. A vertical double-station synchronous displacement detection mechanism, a horizontal double-station synchronous displacement detection mechanism and a limit rotation assembly are provided on the air quality detector with uniform air flow. The settings 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 the uniformly flowing air, and greatly improving the accuracy of air quality detection. The specific structural settings of each mechanism and component are as follows.

[0026] 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.

[0027] 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 to 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 to 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.

[0028] One end of the detection cylinder 2 is fixedly communicated with a suction pipe 18. A negative pressure fan 19 is fixedly installed at one end of the suction 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 fix the installation shell 1 at the air detection position by using bolts, and start the negative pressure fan 19 through the wireless controller 22. In this way, the external air is sucked into the air flow meter 20 through the inlet pipe 21, and 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.

[0029] 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 to 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.

[0030] The top of the threaded sleeve 26 and the bottom of the other threaded sleeve 26 are fixedly connected with a connecting column 27, and one end of each connecting column 27 is fixedly connected with a concave rack 28, which is meshed and driven with the guide gear 12, and one side of the inner wall of each guide gear 12 is slidably connected with a convex strip 29, which is fixedly connected with the linkage column 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 with the support frame 23, and the two threads on the outer wall of the bidirectional screw 24 are opposite and symmetrical; the outer walls of the two threaded sleeves 26 and the inner wall of the support frame 23 are smooth.

[0031] In this technical solution, as shown in the attached Figures 4-9 As shown, the limit rotation assembly includes an annular groove 31 provided at the top of the guide gear 12; the inner wall of the annular groove 31 is slidably connected to a guide column 32, the outer wall of the guide column 32 is fixedly connected to a limit plate 33, the bottom end of the limit plate 33 and near the center point thereof is fixedly connected to a support column 34, and a gap is provided between the support column 34 and the guide gear 12; the bottom end of the support column 34 is fixedly connected to a limit plate 35, the limit plate 35 and the limit plate 33 are both slidably connected to the guide gear 12, the bottom end of the limit plate 35 is fixedly connected to a reinforcement column 36, and the reinforcement column 36 is fixedly connected to the detection barrel 2. The limit plate 33 and the limit plate 35 are symmetrically arranged with respect to the guide gear 12, and the outer walls of the limit plate 33 and the limit plate 35 are both smooth surfaces.

[0032] The working method of the air quality detector of the present invention with uniform air flow is as follows: First, when the present invention performs uniform air flow, the mounting shell 1 is first fixed at the air detection position by bolts, and the negative pressure fan 19 is started by the wireless controller 22, so that the inlet pipe 21 sucks the external air into the air flow meter 20, and the specified flow rate is set by the air flow meter 20, so that the air flows uniformly along the specified flow rate of the air flow meter 20 to the inside of the detection tube 2, and the air quality is detected through the inside of the detection tube 2. At the same time, the air is guided to the position of the negative pressure fan 19 along the suction pipe 18, and the negative pressure fan 19 realizes the discharge operation.

[0033] 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 end of the sleeve rod 7 moves upward, and the other end of the other sleeve rod 7 moves downward. The sleeve rod 7 drives 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 guide gear 12, while the other linkage column 11 slides downward.

[0034] 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.

[0035] 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 stepper motor 25 is started to rotate forward through the wireless controller 22. The stepper 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 guide gear 12 to rotate counterclockwise. The guide 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.

[0036] When the lateral displacement pressure sensor 30 senses the pressure value, the bidirectional screw 24 is driven to reverse by the stepper 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 guide gear 12 to rotate clockwise. The guide 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 stepper motor 25 is started to rotate forward through the wireless controller 22. By continuously driving the stepper 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 precise lateral large-area flow contact detection with a wider detection contact range.

[0037] At the same time, when the present invention performs limit rotation, when the linkage column 11 moves vertically, the support and reinforcement column 36 of the detection cylinder 2 is passed through. The reinforcement column 36 supports the limit disk 35. The limit disk 35 supports the support column 34. The support column 34 can provide a stable support force for the limit plate 33. And the limit plate 33 supports the guide column 32. In this way, the limit plate 33 and the limit disk 35 can perform vertical limit on the guide gear 12, avoiding the problem of vertical movement of the guide gear 12. At the same time, when the guide gear 12 rotates, the guide gear 12 will make the annular groove 31 rotate along the outer wall of the guide column 32. At the same time, the guide gear 12 performs limit and stable rotation between the limit plate 33 and the limit disk 35, ensuring that the guide gear 12 can perform limit rotation at the specified position.

[0038] 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 started 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 contacts the vertical displacement pressure sensor 4, the electric cylinder 3 is immediately started 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, realizing vertical double-station detection reciprocally, and performing vertical large-area precise flow contact detection on the uniformly flowing air inside the detection cylinder 2. The detection contact range is wider, and the detection dead angle is reduced. 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.

[0039] The content not described in detail in the specification belongs to the prior art well-known to those skilled 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.

[0040] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air quality detector for uniform air flow, comprising a mounting shell (1), a detection cylinder (2) and an electric cylinder (3), wherein the detection cylinder (2) is fixed to the inner wall of the mounting shell (1), and the electric cylinder (3) is fixed to one side of the outer wall of the detection cylinder (2), characterized in that: 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 comprises 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 to a hinge block (5); the inner wall of the hinge block (5) is fixedly connected to two push shafts (6); the outer wall of each push shaft (6) is rotatably connected to a sleeve rod (7); A connecting rod (8) is rotatably connected to the inner wall of the sleeve rod (7) and at a position away from the push shaft (6); one end of the connecting rod (8) is fixedly connected to a sleeve slider (9); the outer wall of the sleeve slider (9) is slidably connected to a slide frame (17); one side of the sleeve slider (9) is fixedly connected to an L-shaped bar (10); one end of the L-shaped bar (10) is fixedly connected to a linkage column (11); the outer wall of the linkage column (11) is slidably connected to a guide gear (12); The bottom end of the linkage column (11) is fixedly connected to a cross column (13), and one end of the cross column (13) is fixedly connected to a dust sensor (14); A transverse double-station synchronous displacement detection mechanism is provided on one side of the slide frame (17); A limited rotation component is provided at the top end of the guide gear (12).

2. The air quality detector for uniform air flow according to claim 1, characterized in that: The vertical displacement pressure sensor (4) is used to sense the squeezing force of the hinge block (5); the vertical displacement pressure sensor (4) is slidably connected to the hinge block (5).

3. The air quality detector for uniform air flow according to claim 2, characterized in that: The two linkage columns (11) are both rotatably connected to the detection cylinder (2), and the cross-sectional shape of the linkage columns (11) is circular.

4. The air quality detector for uniform air flow according to claim 3, characterized in that: A displacement distance sensor (15) is fixedly connected to the top end of the outer wall of one of the cross columns (13), and the displacement distance sensor (15) is fixedly connected to the linkage column (11); A sliding column (16) is fixedly connected to the top of the inner wall of the sliding frame (17), and the two sleeve sliding blocks (9) are both slidably connected to the sliding column (16).

5. The air quality detector for uniform air flow according to claim 4, characterized in that: One end of the detection cylinder (2) is fixedly connected to a suction pipe (18), and a negative pressure fan (19) is fixedly installed at one end of the suction pipe (18); The other end of the detection cylinder (2) is fixedly connected to an air flow meter (20), and one end of the air flow meter (20) is fixedly connected to an inlet pipe (21); A wireless controller (22) is fixedly mounted on one side of the mounting shell (1).

6. The air quality detector for uniform air flow according to claim 5, characterized in that: The transverse double-station synchronous displacement detection mechanism comprises a support frame (23) fixedly arranged on one side of the slide frame (17); The support frame (23) is fixedly connected to the detection tube (2); a bidirectional screw (24) is rotatably connected inside the support frame (23); a stepping motor (25) is fixedly mounted on one end of the support frame (23); the stepping motor (25) is used to drive the bidirectional screw (24) to rotate; and two threaded sleeves (26) are threadedly connected to the outer wall of the bidirectional screw (24); The top end of the threaded sleeve (26) and the bottom end of another threaded sleeve (26) are both fixedly connected with a connecting column (27), one end of each connecting column (27) is fixedly connected with a concave rack (28), the concave rack (28) is meshingly connected to the guide gear (12), one side of the inner wall of each guide gear (12) is slidably connected with a convex strip (29), and the convex strip (29) is fixedly connected to the linkage column (11); Lateral displacement pressure sensors (30) are fixedly connected to both sides of the outer wall of one of the dust sensors (14).

7. The air quality detector for uniform air flow according to claim 6, characterized in that: The two threaded sleeve blocks (26) are both slidably connected to the support frame (23), and the two threads on the outer wall of the bidirectional screw (24) are opposite and symmetrically arranged; The outer walls of the two threaded sleeve blocks (26) and the inner wall of the support frame (23) are both smooth surfaces.

8. The air quality detector for uniform air flow according to claim 7, characterized in that: The position-limiting rotation assembly comprises an annular groove (31) formed at the top end of the guide gear (12); The inner wall of the annular groove (31) is slidably connected to a guide column (32), the outer wall of the guide column (32) is fixedly connected to a limit plate (33), the bottom end of the limit plate (33) and a position close to the center point thereof is fixedly connected to a support column (34), and a gap is provided between the support column (34) and the guide gear (12); The bottom end of the support column (34) is fixedly connected to a limit plate (35), the limit plate (35) and the limit plate (33) are both slidably connected to the guide gear (12), the bottom end of the limit plate (35) is fixedly connected to a reinforcement column (36), and the reinforcement column (36) is fixedly connected to the detection cylinder (2).

9. The air quality detector for uniform air flow according to claim 8, characterized in that: The limiting plate (33) and the limiting disk (35) are symmetrically arranged with respect to the guide gear (12), and the outer walls of the limiting plate (33) and the limiting disk (35) are both smooth surfaces.

10. A detection method, using the air quality detector for uniform air flow according to claim 9, characterized in that: The method comprises the following steps: Step 1: The air flows at a uniform speed. The negative pressure fan (19) is started, and a specified flow rate is set by the air flow meter (20). The air flows at a uniform speed into the detection tube (2) along the specified flow rate of the air flow meter (20); Step 2: vertical double-station synchronous displacement detection, the electric cylinder (3) pushes the hinge block (5) to move left, the cross column (13) drives the dust sensor (14) to move upward, and the other dust sensor (14) moves downward; Step 3: Horizontal double-station synchronous displacement detection, the wireless controller (22) starts the stepping motor (25) to reciprocate, the cross column (13) drives the dust sensor (14) to reciprocate, and the other dust sensor (14) reciprocates inside the detection tube (2), wherein the two dust sensors (14) reciprocate in opposite directions; Step 4: limited rotation, the linkage column (11) moves vertically, the limit plate (33) and the limit plate (35) limit the guide gear (12) vertically, the guide gear (12) rotates, and the guide gear (12) causes the annular groove (31) to rotate along the outer wall of the guide column (32).

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