Dust environment simulation device

Abstract

The invention discloses a dust environment simulation device, which comprises a simulation chamber, a grading assembly, a storage assembly, a fan-shaped nozzle and a moving mechanism, a dust concentration detector is installed in the simulation chamber, the grading assembly is installed outside the simulation chamber, the grading assembly is suitable for screening dust according to particle size, and the fan-shaped nozzle is used for storing the dust concentration detector. The storage assembly is located in the simulation chamber, the storage assembly comprises a plurality of storage boxes, the storage boxes are suitable for storing screened dust with different particle sizes, the grading assembly is connected with the storage boxes so as to be suitable for inputting the graded dust into the storage boxes, air inlet pipes are arranged on the storage boxes, and air outlet pipes are arranged on the air inlet pipes. The air inlet pipe is suitable for being externally connected with an air blower, the fan-shaped nozzles are in butt joint with the independent storage boxes so as to be suitable for spraying the dust in the corresponding storage boxes into the simulation chamber, and the dust concentration is accurately adjusted by screening the dust, independently storing the dust according to the particle size and independently discharging the dust according to the required particle size according to the actual requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of dust environment simulation, and specifically, to a dust environment simulation device. Background Art

[0002] At present, in many fields such as modern industry and environmental monitoring, accurate detection and control of dust concentration are of great significance. In industries such as mining and building materials processing, it is related to occupational health, product quality and safety. In environmental monitoring, it helps to evaluate air quality and policy formulation. And the calibration of dust concentration detectors needs to rely on dust environment simulation devices. Therefore, the control of dust concentration in the environment is particularly important. The existing dust environment simulation devices are not convenient for adjusting the dust concentration, so it is difficult to detect the test results of dust concentration detectors in environments with different dust concentrations.

[0003] After retrieval, it is found that the patent with the publication number CN221405282U discloses a dust environment simulation device, which includes a dust simulation chamber, etc. It feeds materials through a feeding bin. The powder enters the feeding pipe through the inclined surface of the inner wall of the feeding bin. It can also use an external control device to control the electric telescopic rod to drive the leakage adjusting plate to move up and down to adjust the dust generation concentration, and has the characteristics of strong practicability and adjustable dust concentration. However, in this solution, the feeding rate is controlled by moving the leakage adjusting plate up and down to achieve the effect of adjusting the dust concentration in the environment. However, the effect of adjusting the concentration by this method is not good. Similarly, in the prior art, there are also methods of adjusting the dust concentration in the environment by changing the air flow. However, these methods have fundamental problems. There will also be problems with different particle sizes in the same batch of dust. Due to differences in physical properties such as sedimentation speed and suspension time of different particles, the distribution and movement states in the air after mixing are different. Even if methods such as uniform spraying or uniform feeding are used, due to differences in particle characteristics, it is difficult to accurately control and predict the actual distribution and concentration change of dust, resulting in the inability to accurately adjust the dust concentration in the simulation environment, making the calibration work of dust concentration detectors have large errors and low accuracy, and affecting the reliability and effectiveness of the detectors in actual applications. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects existing in the prior art, and provide a dust environment simulation device that accurately adjusts the dust concentration by screening the dust, storing it separately according to the particle size, and selectively discharging the required particle size according to actual needs.

[0005] To solve the above technical problem, the technical solution of the present invention is a dust environment simulation device, including: A simulation chamber, in which a dust concentration detector is installed; A classification component, which is installed outside the simulation chamber and is adapted to screen the dust according to the particle size; A storage component, the storage component is located in the simulation chamber, the storage component includes a plurality of storage bins, and the plurality of storage bins are adapted to store dust of different particle sizes after screening respectively. The classification component is connected to the storage bins to be adapted to input the classified dust into the storage bins. An air inlet pipe is arranged on the storage bin, and the air inlet pipe is adapted to be externally connected to a blower; A fan-shaped nozzle, the fan-shaped nozzle is docked with a single storage bin to be adapted to spray the dust in the corresponding storage bin into the simulation chamber; A moving mechanism, the moving mechanism is connected to the fan-shaped nozzle to be adapted to drive the fan-shaped nozzle to dock with any one of the storage bins, and then cooperate with the blower to spray dust of a specified particle size, so as to adjust the dust concentration in the simulation chamber.

[0006] Further, the classification component includes: A classification cylinder and a centrifugal cylinder arranged coaxially. The classification cylinder is installed on the simulation chamber, and the centrifugal cylinder is rotatably installed in the classification cylinder; A rotation driving mechanism, the rotation driving mechanism is installed on the classification cylinder, and the rotation driving mechanism is connected to the centrifugal cylinder to be adapted to drive the centrifugal cylinder to rotate; A plurality of screens arranged at intervals in the centrifugal cylinder and in a circular ring shape. The plurality of screens divide the internal space of the classification cylinder into a plurality of concentric and annular screening chambers; A plurality of conical receiving bins corresponding to the screening chambers. The conical receiving bins are connected to the bottom of the classification cylinder. Through grooves corresponding to the screening chambers and penetrating through the classification cylinder are formed in the classification cylinder, and the through grooves are respectively communicated with the internal spaces of the corresponding screening chambers and the conical receiving bins; Wherein, the sizes of the screening holes of the plurality of screens gradually become smaller layer by layer outward with the center of the centrifugal cylinder as the center. The centrifugal cylinder is adapted to be driven to rotate to drive the dust to pass through the corresponding screens according to the particle size, and then enter the corresponding conical receiving bins; The conical receiving bins are arranged in sequence from outside to inside in the radial direction, the storage bins are arranged in layers from bottom to top in the vertical direction, the outermost conical receiving bin corresponds to the bottommost storage bin, adjacent conical receiving bins correspond to adjacent storage bins, and a conveying pipe is arranged between the conical receiving bin and the corresponding storage bin.

[0007] Further, the rotation drive mechanism includes a first drive motor, a first driving gear, and a first driven gear. The first drive motor is mounted on the grading cylinder. The first driven gear is fixedly sleeved on the centrifugal cylinder. The first driving gear is rotatably mounted on the grading cylinder. The first driven gear meshes with the first driving gear. The first drive motor is connected to the first driving gear to drive the first driving gear to rotate. The moving mechanism includes a second drive motor, a bracket, and a threaded rod. The bracket is connected to the storage tank. The second drive motor is mounted on the bracket. The threaded rod is rotatably mounted on the bracket. The sector nozzle is assembled outside the threaded rod. The second drive motor is connected to the threaded rod to drive the threaded rod to rotate, thereby driving the sector nozzle to move along the axis direction of the threaded rod. A chute is formed on the storage tank. A slider is arranged on the sector nozzle. The slider is slidably arranged in the chute.

[0008] Further, fixing rings are respectively arranged in a plurality of the screening chambers. The fixing rings are fixedly connected to the grading cylinder. A plurality of vibration mechanisms arranged at intervals are arranged in the fixing rings. The vibration mechanisms are adapted to vibrate the corresponding screen meshes. The vibration mechanism includes a rotating rod, a first cam, and a first spring. The rotating rod is rotatably mounted in the fixing ring. The first cam is fixedly sleeved on the outer peripheral surface of the rotating rod. The first spring is sleeved outside the rotating rod. One end of the first spring is connected to the grading cylinder, and the other end of the first spring is connected to the first cam. A contact part is arranged on the first cam. The contact part contacts the corresponding screen mesh. When the screen mesh is driven to rotate, a thrust is generated on the contact part, thereby driving the first cam to generate an angular offset. After the first cam generates an angular offset, it is reset by the first spring to impact the corresponding screen mesh to generate vibration.

[0009] Further, a feed inlet and a discharge outlet are arranged on the storage tank. The feed inlet is adapted to introduce dust into the storage tank. An outer roller is fixedly arranged at the discharge outlet. An inner roller is rotatably mounted at the discharge outlet. The inner roller is located inside the outer roller. Matching grooves penetrating through themselves are formed on both the inner roller and the outer roller. A support rod is provided on the inner roller. The support rod passes through the outer roller and the storage box to the outside of the storage box. A second spring is sleeved on the part of the support rod located outside the storage box. One end of the second spring is connected to the storage box, and the other end of the second spring is connected to the support rod. The support rod is connected with a connecting rod through a one-way bearing, and a driving gear is connected to the connecting rod. A rack is provided on the sector nozzle. The rack is adapted to move from bottom to top towards the storage box following the sector nozzle, so that the rack meshes with the corresponding driving gear, and then drives the driving gear, the connecting rod, the support rod and the inner roller to rotate, aligning the matching groove between the outer roller and the inner roller to open the discharge port; A rotating shaft is rotatably installed on the storage box. A switch plate corresponding to the feed port is fixedly sleeved on the rotating shaft. A synchronous belt is sleeved between the rotating shaft and the support rod through a synchronous pulley. When the inner roller is driven to deflect by an angle to open the discharge port, the rotating shaft rotates following the support rod through the synchronous belt until the switch plate closes the corresponding feed port; When the rack is disengaged from the driving gear, the support rod is reset through the second spring, and then drives the inner roller to reset to close the discharge port, and drives the switch plate to reset to open the feed port; When the rack moves from top to bottom following the sector nozzle and meshes with the driving gear, it cannot drive the support rod to rotate.

[0010] Further, the connecting rod is hollow. An extension rod is connected to the support rod. The extension rod passes through the one-way shaft and the inside of the connecting rod to the outside of the connecting rod. A first mounting box is connected to the protruding part of the extension rod. An infrared receiver is installed on the first mounting box. A controller is arranged inside the first mounting box. A second mounting box is arranged on the storage box. An infrared transmitter is installed on the second mounting box. The infrared receiver is connected to the controller, and the controller is connected to an external blower. The first mounting box is adapted to rotate following the inner roller. When the inner roller is driven to rotate to open the discharge port, the infrared receiver is aligned with the infrared transmitter. The infrared receiver is adapted to feedback the received signal to the controller, and the controller is adapted to start the blower after receiving the signal.

[0011] Further, an inclined placement plate is movably arranged in the storage box. The high end of the inclined placement plate is located at the feed port, and the low end of the inclined placement plate is located at the discharge port. A plurality of third springs are spaced apart on both sides of the inclined placement plate. Both ends of the third spring are respectively connected to the inclined placement plate and the storage box; A rotating rod is connected to the bottom of the centrifugal cylinder. The rotating rod passes through the classification cylinder and all the storage boxes. A number of second cams corresponding to the storage boxes are fixedly sleeved on the rotating rod. A matching block is arranged at the high end of the inclined placement plate. The second cams are adapted to be driven to rotate and intermittently press the matching block, so as to drive the corresponding inclined placement plate to vibrate. A baffle is arranged in the storage box. The baffle is adjacent to the discharge port. A guiding part is arranged on the baffle. The guiding part is in contact with the matching groove of the outer roller. A straight groove penetrating through the baffle itself is formed on the baffle. The straight groove is adapted to guide the dust to the guiding part, so that the dust enters the matching groove of the outer roller.

[0012] Further, the internal space of the sector nozzle includes a high-speed area, two medium-speed areas and two low-speed areas. A spoiler is fixedly arranged at the high-speed area. The spoiler is hollow. A diversion groove penetrating through the spoiler itself is formed on the spoiler. The diversion groove is adapted to divert part of the dust and air flow passing through the high-speed area into the medium-speed areas. An arc-shaped diversion part is arranged on the diversion groove. An adjusting plate is arranged between the adjacent medium-speed area and the low-speed area. A docking rod is arranged at one end of the adjusting plate close to the storage box. The other end of the adjusting plate is a swinging end. The docking rod is rotatably installed on the sector nozzle. A swinging adjusting mechanism is arranged on the adjusting plate. The swinging adjusting mechanism is adapted to drive the swinging end of the adjusting plate to generate an angular offset, so as to change the flow rate of the dust and air flow passing through the low-speed area. A number of spaced-apart wind power impellers are rotatably installed at the outlet of the sector nozzle. The wind power impellers are adapted to upwardly draw part of the air flow and dust passing through the sector nozzle.

[0013] Further, the swinging adjusting mechanism is a balance block. The balance block is connected to the swinging end of the adjusting plate. The air flow passing through the medium-speed area and the low-speed area is adapted to contact the balance block, so as to drive the adjusting plate to swing to balance the flow rate of the air flow passing through the medium-speed area and the low-speed area.

[0014] Further, the swing adjustment mechanism includes a third drive motor, a second driving gear and a second driven gear, the third drive motor is mounted on the fan-shaped nozzle, the second driving gear and the second driven gear are both rotatably mounted on the fan-shaped nozzle, the second driving gear is meshed with the second driven gear, the third drive motor is connected to the second driving gear, so as to drive the second driving gear and the second driven gear to rotate in opposite directions, a pad is provided on the second driving gear, a first toggle plate is provided on the pad, a second toggle plate is provided on the second driven gear, and the first toggle plate and the second toggle plate do not contact when the second driving gear and the second driven gear rotate in opposite directions; Both of the two docking rods pass through the fan-shaped nozzle and extend to the outside of the fan-shaped nozzle. A fourth spring is sleeved on the extended part of the docking rod. The two ends of the fourth spring are respectively connected to the docking rod and the fan-shaped nozzle. A first force-bearing plate is fixedly sleeved on the docking rod adjacent to the second driving gear, and a second force-bearing plate is fixedly sleeved on the docking rod adjacent to the second driven gear. The first toggle plate is suitable for being driven to rotate and thereby squeeze the first force-bearing plate, thereby forcing the adjustment plate corresponding to the first force-bearing plate to deviate toward the adjacent low-speed area. The second toggle plate is suitable for being driven to rotate and thereby squeeze the second force-bearing plate, thereby forcing the adjustment plate corresponding to the second force-bearing plate to deviate toward the adjacent low-speed area.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. Through the setting of structures such as grading cylinders, centrifugal cylinders and multi-layer screens, the incoming dust is screened according to particle size by centrifugal force through the rotation of the centrifugal cylinders and multi-layer screens. After screening, the dust enters the designated storage box through the corresponding conical storage box for separate storage. When in use, the fan-shaped nozzle is driven by the moving mechanism to move to the required storage box, and the dust of uniform particle size in the storage box is discharged. Since the dust discharged each time is of uniform particle size, the dust concentration in the environment is more convenient and accurate to adjust. The storage boxes are distributed vertically, and the smaller the dust particles are, the lower the position is. The small dust particles discharged are at the bottom, and the large particles are at the top, so as to avoid the large dust particles from settling too quickly.

[0016] 2. Through the arrangement of structures such as the driving gear, rack, synchronous belt, and second spring, when selecting the storage box corresponding to the dust to be discharged, the sector nozzle is moved to the position of the storage box. During the movement, the rotation of the inner roller is driven by the meshing of the rack and the driving gear to open the channel between the storage box and the sector nozzle. At the same time, the synchronous belt is driven to rotate the switch plate to close the feed port. Then, by driving the rotation of the infrared receiver, the infrared receiver is aligned with the infrared transmitter to drive the blower to work, ensuring that while blowing out the dust in the storage box, the air flow is prevented from flowing back into the conical storage box and the screening chamber. After the spraying is completed, the driving gear is disconnected from the rack, and the second spring is used to automatically close the discharge port and the blower, and the feed port is automatically opened to refill the storage box again, reducing excessive manual intervention.

[0017] 3. Through the arrangement of structures such as the spoiler, regulating plate, and wind-powered impeller, the diversion grooves and arc-shaped diversion parts of the spoiler disperse the high-speed air flow to the medium-speed area, reducing the local flow velocity difference and improving the uniformity of dust suspension. The wind-powered impeller is driven to rotate by the air flow, pulling part of the dust upward to extend the suspension time, more realistically simulating the dust diffusion scenario in an open space. The swinging end of the regulating plate is dynamically adjusted in angle by a balance weight or a third motor to balance the flow velocities of the air flows passing through the medium-speed area and the low-speed area, avoiding insufficiently uniform dust spraying due to too low a flow velocity in the low-speed area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the positional relationship between the dust discharging device and the simulation chamber of the present invention; Figure 3 is a schematic diagram of the overall structure of the dust discharging device of the present invention; Figure 4 is a schematic diagram of the internal structure of the classification cylinder of the present invention; Figure 5 is a schematic diagram of the internal structure of the centrifugal cylinder of the present invention; Figure 6 is a plane sectional view of the classification cylinder of the present invention; Figure 7 is a schematic diagram of the bottom structure of the centrifugal cylinder of the present invention; Figure 8 is a schematic diagram of the structure of the vibration mechanism of the present invention; Figure 9 of the present invention Figure 8 is an enlarged view of part A; Figure 10 is a schematic diagram of the structure of the storage component of the present invention; Figure 11 is a schematic diagram of the internal structure of a single storage box of the present invention Figure 1 ; Figure 12 Schematic diagram of the internal structure of a single storage box of the present invention Figure 2 ; Figure 13 For the present invention Figure 12 Enlarged view of point B in the middle; Figure 14 It is a schematic diagram of the internal structure of the fan-shaped nozzle of the present invention; Figure 15 It is a schematic diagram of the bottom structure of the fan-shaped nozzle of the present invention; In the picture: 1. Simulation room; 2. Dust concentration detector; 3. Classification assembly; 31. Classification cylinder; 32. Centrifugal cylinder; 33. First drive motor; 34. First driving gear; 35. First driven gear; 36. Screen; 37. Screening chamber; 38. Conical storage box; 39. Delivery pipe; 310. Fixed ring; 311. Rotating rod; 312. First cam; 313. Contact part; 314. First spring; 4. Storage assembly; 41. Storage box; 43. Feed port; 44. Air inlet pipe; 45. Discharge port; 46. Fan-shaped nozzle; 47. Second drive motor; 48. Bracket; 49. Threaded rod; 410. Rack; 411. Drive gear; 412. Connecting rod; 413. Support rod; 414. Inner roller; 415. Outer roller; 416. First installation box; 417. Second installation box; 418. Infrared receiver; 419. Infrared transmitter; 420. Second spring; 421. Synchronous belt; 422. Rotating shaft; 423. Switch plate; 424. Inclined placement plate; 425. Third spring; 426. Rotating rod; 427. Second cam; 428. Matching block; 429. Baffle; 430. Guide; 51. High-speed area; 52. Medium-speed area; 53. Low-speed area; 54. Spoiler; 55. Diverter groove; 56. Arc-shaped diverter; 57. Adjustment plate; 58. Balance block; 59. Docking rod; 510. Second force plate; 511. Fourth spring; 512. Third drive motor; 513. Second driving gear; 514. Second driven gear; 515. Second toggle plate; 516. First toggle plate; 517. First force plate; 518. Wind-powered impeller. DETAILED DESCRIPTION

[0019] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0020] Embodiment 1: Figures 1-3 As shown, a dust environment simulation device comprises: A simulation room 1, wherein a dust concentration detector 2 is installed in the simulation room 1; The grading component 3 is installed outside the simulation chamber 1 and is adapted to screen dust according to particle size. The storage component 4 is located inside the simulation chamber 1. The storage component 4 includes a number of storage bins 41, and the number of storage bins 41 is adapted to store dust of different particle sizes after screening respectively. The grading component 3 is connected to the storage bin 41 to be adapted to input the graded dust into the storage bin 41. An air inlet pipe 44 is provided on the storage bin 41, and the air inlet pipe 44 is adapted to be externally connected to a blower. The fan-shaped nozzle 46 is docked with a separate storage bin 41 to be adapted to spray the dust in the corresponding storage bin 41 into the simulation chamber 1. The moving mechanism is connected to the fan-shaped nozzle 46 to be adapted to drive the fan-shaped nozzle 46 to dock with any one of the storage bins 41, and then cooperate with the blower to spray dust of a specified particle size, so as to adjust the dust concentration in the simulation chamber 1.

[0021] As Figures 4-7 shown, the grading component 3 includes: The grading cylinder 31 and the centrifugal cylinder 32 are coaxially arranged. The grading cylinder 31 is installed on the simulation chamber 1, and the centrifugal cylinder 32 is rotatably installed inside the grading cylinder 31. The rotary drive mechanism is installed on the grading cylinder 31, and the rotary drive mechanism is connected to the centrifugal cylinder 32 to be adapted to drive the centrifugal cylinder 32 to rotate. A number of screen meshes 36 are arranged at intervals inside the centrifugal cylinder 32 and are in a circular ring shape. The number of screen meshes 36 divides the internal space of the grading cylinder 31 into a plurality of concentric and annular screening chambers 37. A number of conical receiving bins 38 corresponding to the screening chambers 37 are connected to the bottom of the grading cylinder 31. Through grooves corresponding to the screening chambers 37 and penetrating through itself are opened in the grading cylinder 31, and the through grooves are respectively communicated with the internal spaces of the corresponding screening chambers 37 and the conical receiving bins 38. Among them, the sizes of the screen holes of the number of screen meshes 36 gradually become smaller layer by layer outward with the center of the centrifugal cylinder 32 as the center. The centrifugal cylinder 32 is adapted to be driven to rotate to drive the dust to pass through the corresponding screen mesh 36 according to the particle size, and then enter the corresponding conical receiving bin 38. The conical receiving bins 38 are arranged in sequence from outside to inside in the radial direction, and the storage bins 41 are arranged in layers from bottom to top in the vertical direction. The outermost conical receiving bin 38 corresponds to the bottommost storage bin 41, adjacent conical receiving bins 38 correspond to adjacent storage bins 41, and a conveying pipe 39 is provided between the conical receiving bin 38 and the corresponding storage bin 41.

[0022] As Figures 3-4As shown in the figure, the rotation drive mechanism includes a first drive motor 33, a first driving gear 34 and a first driven gear 35. The first drive motor 33 is installed on the grading cylinder 31. The first driven gear 35 is fixedly sleeved on the centrifugal cylinder 32. The first driving gear 34 is rotatably installed on the grading cylinder 31. The first driven gear 35 meshes with the first driving gear 34. The first drive motor 33 is connected to the first driving gear 34 to drive the first driving gear 34 to rotate. The moving mechanism includes a second drive motor 47, a bracket 48 and a threaded rod 49. The bracket 48 is connected to the storage tank 41. The second drive motor 47 is installed on the bracket 48. The threaded rod 49 is rotatably installed on the bracket 48. The sector nozzle 46 is assembled outside the threaded rod 49. The second drive motor 47 is connected to the threaded rod 49 to drive the threaded rod 49 to rotate, thereby driving the sector nozzle 46 to move along the axis of the threaded rod 49. A chute is formed in the storage tank 41, and a slider is arranged on the sector nozzle 46. The slider is slidably arranged in the chute.

[0023] As Figures 8-9 shown, a fixed ring 310 is respectively arranged in a plurality of screening chambers 37. The fixed ring 310 is fixedly connected to the grading cylinder 31. A plurality of vibration mechanisms arranged at intervals are arranged in the fixed ring 310. The vibration mechanism is adapted to vibrate the corresponding screen 36. The vibration mechanism includes a rotating rod 311, a first cam 312 and a first spring 314. The rotating rod 311 is rotatably installed in the fixed ring 310. The first cam 312 is fixedly sleeved on the outer peripheral surface of the rotating rod 311. The first spring 314 is sleeved outside the rotating rod 311. One end of the first spring 314 is connected to the grading cylinder 31, and the other end of the first spring 314 is connected to the first cam 312. A contact portion 313 is arranged on the first cam 312. The contact portion 313 contacts the corresponding screen 36. When the screen 36 is driven to rotate, a thrust is generated on the contact portion 313, thereby driving the first cam 312 to generate an angular offset. After the first cam 312 generates an angular offset, it is reset by the first spring 314 to impact the corresponding screen 36 to generate vibration.

[0024] The working principle of this embodiment is as follows: During use, after the dust is put into the classification cylinder 31, the classification cylinder 31 is used to screen the dust. The dust after screening is distinguished by particle size and stored separately in the corresponding storage box 41. Then, the sector nozzle 46 is moved to the required storage box 41, and air flow is introduced through the corresponding air inlet pipe 44 of the storage box 41 to spray the dust with uniform particle size in the storage box 41 into the simulation chamber 1 through the sector nozzle 46. According to actual needs, the sector nozzle 46 can be moved to multiple storage boxes 41 and the dust in these storage boxes 41 can be ejected. Since the dust in each storage box 41 has a uniform particle size, when it is sprayed into the simulation chamber 1, the concentration of the dust is easier to control and adjust. A dust concentration detector 2 is provided in the simulation chamber 1. In the case of facilitating the adjustment of the dust concentration, the calibration of the dust concentration detector 2 is more accurate and convenient. The generation of the air flow is generated by a blower externally connected to the air inlet pipe 44. The blower is not shown in the figure, and the structure and working principle of the blower are both prior arts and will not be elaborated in detail here; When the dust is put into the classification cylinder 31, it will enter the centrifugal cylinder 32. At this time, the first drive motor 33 is started to drive the first driving gear 34 to rotate. The rotation of the centrifugal cylinder 32 is realized through the meshing of the first driving gear 34 and the first driven gear 35, so as to generate a centrifugal force on the dust in the centrifugal cylinder 32, and then prompt the dust to pass through the screen 36. The screen holes of each annular screen 36 gradually become smaller from the inside to the outside with the centrifugal cylinder 32 as the center. When the dust passes through the screen 36, it determines how many layers of the screen 36 it passes through according to its own particle size. When it cannot pass through the subsequent screen 36, it will fall into the corresponding conical storage box 38 in the screening chamber 37 at this screen 36 and enter the designated storage box 41 for storage through the corresponding conveying pipe 39. In this setting, the same batch of dust can be divided into multiple portions according to particle size. The more screens 36 the dust passes through, the smaller its particles are, that is, the dust particles passing through the outermost screen 36 are the smallest. The storage box 41 corresponding to the outermost screening chamber 37 is located at the bottom layer. The final effect is that the dust particles stored in the storage box 41 at the bottom layer are the smallest, and the higher the layer of the storage box 41, the larger the dust particles stored inside. When the subsequent dust is blown out by the air flow, the small particle dust located below has a longer suspension time, and the large particle dust located above has a shorter suspension time, avoiding the obvious stratification phenomenon of large particle dust and small particle dust caused by the rapid sedimentation of large particles, making the calibration of the dust concentration detector 2 inaccurate. At the same time, after the large particles are sprayed, small particle dust can be continuously sprayed. During the sedimentation process of the large particles, they are wrapped by the small particle air flow ejected subsequently, delaying the sedimentation speed; The movement of the fan-shaped nozzle 46 is electrically controlled. When the fan-shaped nozzle 46 needs to move, the second drive motor 47 is started to drive the threaded rod 49 to rotate, thereby driving the fan-shaped nozzle 46 assembled on the threaded rod 49 to move along the axial direction of the threaded rod 49. The moving direction of the fan-shaped nozzle 46 is changed by the forward and reverse rotation of the threaded rod 49. The threaded rod 49 and the fan-shaped nozzle 46 can be assembled through a ball nut. The specific working principle of the threaded rod 49 to achieve linear movement with the assembled parts by rotation is the prior art and will not be described in detail here. In order to prevent the fan-shaped nozzle 46 from rotating under the drive of the threaded rod 49, a slider is provided on the fan-shaped nozzle 46. When the fan-shaped nozzle 46 moves, the slider moves in the slide groove of the storage box 41, while also improving the stability of the movement. In order to prevent each screen 36 from being blocked during the dust screening process, a fixing ring 310 is provided in the screening cavity 37 formed by each screen 36, and a plurality of vibration mechanisms are arranged at intervals in the fixing ring 310, and the vibration mechanisms can vibrate the corresponding screen 36 to prevent the screen 36 from being blocked. It should be noted that the fixing ring 310 is fixedly arranged in the classification cylinder 31 and does not rotate with the centrifugal cylinder 32 and the screen 36; The working principle of the vibration mechanism is that when the screen 36 follows the centrifugal cylinder 32 in a rotating state, the edge of the screen 36 or the part protruding relative to the screen hole periodically contacts the contact portion 313 of the first cam 312, and applies a tangential thrust to the contact portion 313. The thrust forces the first cam 312 to produce an angular offset, driving the rotating rod 311 to synchronously offset, and twisting the first spring 314 in the process. When the screen 36 continues to rotate until it is out of contact with the contact portion 313, the first spring 314 releases energy and resets, and at the same time drives the first cam 312 and the rotating rod 311 to reset together, that is, reverse rotation. During the resetting process, the first cam 312 generates an instantaneous impact force on the surface of the screen 36, causing high-frequency micro-amplitude vibration of the screen 36 to prevent the screen 36 from being blocked.

[0025] Embodiment 2: Figures 10-13 As shown, this embodiment further includes the following structure on the basis of the first embodiment: a feed port 43 and a discharge port 45 are provided on the storage box 41, the feed port 43 is suitable for passing dust into the storage box 41, an outer roller 415 is fixedly provided at the discharge port 45, an inner roller 414 is rotatably installed at the discharge port 45, the inner roller 414 is located inside the outer roller 415, and the inner roller 414 and the outer roller 415 are both provided with matching grooves penetrating through themselves; A support rod 413 is provided on the inner roller 414. The support rod 413 passes through the outer roller 415 and the storage box 41 to the outside of the storage box 41. A second spring 420 is sleeved on the part of the support rod 413 located outside the storage box 41. One end of the second spring 420 is connected to the storage box 41, and the other end of the second spring 420 is connected to the support rod 413. The support rod 413 is connected with a connecting rod 412 through a one-way bearing. A driving gear 411 is connected to the connecting rod 412. A rack 410 is provided on the sector nozzle 46. The rack 410 is adapted to move from bottom to top towards the storage box 41 following the sector nozzle 46, so that the rack 410 meshes with the corresponding driving gear 411, thereby driving the driving gear 411, the connecting rod 412, the support rod 413 and the inner roller 414 to rotate, aligning the mating groove of the outer roller 415 and the inner roller 414 to open the discharge port 45; A rotating shaft 422 is rotatably installed on the storage box 41. A switch plate 423 corresponding to the feed port 43 is fixedly sleeved on the rotating shaft 422. A synchronous belt 421 is sleeved between the rotating shaft 422 and the support rod 413 through a synchronous pulley. When the inner roller 414 is driven to be angularly offset to open the discharge port 45, the rotating shaft 422 rotates following the support rod 413 through the synchronous belt 421 until the switch plate 423 closes the corresponding feed port 43; When the rack 410 is disengaged from the driving gear 411, the support rod 413 is reset through the second spring 420, thereby driving the inner roller 414 to reset to close the discharge port 45, and driving the switch plate 423 to reset to open the feed port 43; When the rack 410 moves from top to bottom following the sector nozzle 46, it meshes with the driving gear 411 and cannot drive the support rod 413 to rotate.

[0026] As Figure 13 shown, the connecting rod 412 is hollow. An extension rod is connected to the support rod 413. The extension rod passes through the inside of the one-way shaft and the connecting rod 412 to the outside of the connecting rod 412. A first mounting box 416 is connected to the protruding part of the extension rod. An infrared receiver 418 is installed on the first mounting box 416. A controller is arranged inside the first mounting box 416. A second mounting box 417 is provided on the storage box 41. An infrared transmitter 419 is installed on the second mounting box 417. The infrared receiver 418 is connected to the controller, and the controller is connected to an external blower. The first mounting box 416 is adapted to rotate following the inner roller 414. When the inner roller 414 is driven to rotate to open the discharge port 45, the infrared receiver 418 is aligned with the infrared transmitter 419. The infrared receiver 418 is adapted to feed back the received signal to the controller, and the controller is adapted to start the blower after receiving the signal.

[0027] As Figure 12As shown, an inclined placement plate 424 is movably arranged in the storage box 41. The high end of the inclined placement plate 424 is located at the feed inlet 43, and the low end of the inclined placement plate 424 is located at the discharge outlet 45. A number of third springs 425 are arranged at intervals on both sides of the inclined placement plate 424. The two ends of the third spring 425 are respectively connected to the inclined placement plate 424 and the storage box 41; A rotating rod 426 is connected to the bottom of the centrifugal cylinder 32. The rotating rod 426 passes through the classification cylinder 31 and all the storage boxes 41. A number of second cams 427 corresponding to the storage boxes 41 are fixedly sleeved on the rotating rod 426. A matching block 428 is arranged at the high end of the inclined placement plate 424. The second cam 427 is adapted to be driven to rotate and intermittently press the matching block 428, so as to drive the corresponding inclined placement plate 424 to vibrate; A baffle 429 is arranged in the storage box 41. The baffle 429 is adjacent to the discharge outlet 45. A guiding part 430 is arranged on the baffle 429. The guiding part 430 is in contact with the matching groove of the outer roller 415. A straight groove penetrating through itself is opened on the baffle 429. The straight groove is adapted to guide the dust to the guiding part 430, so that the dust enters the matching groove of the outer roller 415.

[0028] The working principle of this embodiment is as follows: During use, the sector nozzle 46 docks with only one storage box 41 each time and sprays out the dust inside it. The rest of the storage boxes 41 are in an idle state. To prevent the dust in the idle storage boxes 41 from leaking and to ensure that the discharge outlet 45 can be opened in time when the storage box 41 docks with the sector nozzle 46, an outer roller 415 is fixedly arranged at the discharge outlet 45. A rotatable inner roller 414 is arranged inside the outer roller 415. Matching grooves penetrating through themselves are opened on both the outer roller 415 and the inner roller 414. By rotating the inner roller 414, the alignment state of the two matching grooves is changed, so as to change the opening and closing state of the discharge outlet 45; When the sector nozzle 46 is driven to move upward to the designated storage tank 41, the rack 410 on the sector nozzle 46 meshes with the driving gear 411 on the storage tank 41, thereby driving the driving gear 411 to rotate. The driving gear 411 then drives the connecting rod 412 and the support rod 413 to rotate synchronously. The support rod 413 is connected to the inner roller 414, so the inner roller 414 can be driven to rotate. After the inner roller 414 rotates, the originally staggered mating grooves are aligned, and the feed port 43 is opened. When the sector nozzle 46 is completely docked with the storage tank 41, the discharge port 45 is also completely opened. At this time, the blower can be used to eject the dust in the storage tank 41. During this process, the second spring 420 outside the support rod 413 is distorted. When the sector nozzle 46 continues to move upward and docks with other storage tanks 41, the rack 410 disengages from the previously meshed driving gear 411. The support rod 413 that loses the support of the meshing force of the rack 410 is reset by the second spring 420, and at the same time drives the inner roller 414 to reset. The reset of the inner roller 414 causes the mating grooves to stagger again to close the feed port 43; The sector nozzle 46 moves from the bottommost storage tank 41 to the topmost one. After docking with each layer of the storage tank 41, that is, after all particle-sized dust has been evenly sprayed once, the dust in the simulation chamber 1 is in a relatively uniform distribution state. When it is necessary to further increase the dust concentration in the simulation chamber 1, the sector nozzle 46 moves in the reverse direction. When the sector nozzle 46 moves in the reverse direction, the rack 410 of the sector nozzle 46 will engage with the driving gear 411 again and drive the driving gear 411 to rotate. However, due to the setting of the one-way bearing between the support rod 413 and the connecting rod 412, only when the rack 410 moves upward can torque be transmitted. When the rack 410 engages with the driving gear 411 from top to bottom and drives the driving gear 411 to rotate, it will not drive the support rod 413 to rotate, so the discharge port 45 will not be opened either. This setting prevents the dust on each layer from being accidentally ejected again when the sector nozzle 46 moves in the reverse direction, resulting in uncontrollable dust concentration. When the sector nozzle 46 moves in the reverse direction to below the storage tank 41 that needs to be opened again, it then changes to move upward. The way of moving upward to open the storage tank 41 is the same as the above principle. With this setting, the sector nozzle 46 can achieve repeated opening and spraying of a single layer, or it can move in the reverse direction to a specified layer and then continuously move upward to open and spray all the storage tanks 41 above the specified layer. This setting can flexibly open each layer of the storage tank 41 to meet the need to adjust the dust concentration. However, it should be noted that when the sector nozzle 46 moves from top to bottom, it can select any layer of the storage tank 41 to open without following the order of each layer. But when moving from bottom to top, it will open the docked storage tank 41 layer by layer. The specific usage method can be adaptively adjusted according to the actual concentration requirements. In a single layer, the engagement and disengagement states between the rack 410 and the driving gear 411 corresponding to this layer are completed within the range of this layer and will not affect the driving gears 411 of other layers. That is, when the rack 410 engages with the driving gear 411 of a certain layer from bottom to top and then continues to move to disengage from the driving gear 411, in the completely disengaged state, there is still a certain distance between the rack 410 and the driving gear 411 of the adjacent layer, and further movement is required to achieve the engagement between the rack 410 and the driving gear 411 of the adjacent layer; To prevent part of the air flow from flowing back into the inside of the conveying pipe 39 during the process of opening the air vent of the storage tank 41 to eject dust, thus affecting the dust in the screening chamber 37, when the support rod 413 is driven to rotate to open the discharge port 45, it will drive the rotating shaft 422 to rotate through the synchronous belt 421. The rotating shaft 422 drives the switch plate 423 to rotate when rotating. After the switch plate 423 rotates, it closes the corresponding feed port 43 to prevent the air flow from flowing back into the conveying pipe 39 through the feed port 43. When the support rod 413 resets through the second spring 420 to automatically close the feed port 43, the switch plate 423 will also reset. At this time, the feed port 43 is opened again to fill the just-emptied storage tank 41 with dust; To improve the automation level of the blower startup, an extension rod is added to the support rod 413. The extension rod passes through the hollow parts of the one-way bearing and the connecting rod 412 and is connected to a first mounting box 416. An infrared receiver 418 is provided on the first mounting box 416. Electrical components such as a controller and the power supply of the infrared receiver 418 are provided inside the first mounting box 416. A second mounting box 417 is provided on the storage box 41. An infrared transmitter 419 is provided on the second mounting box 417. Electrical components such as the power supply of the infrared transmitter 419 are provided inside the second mounting box 417. When the support rod 413 is driven to rotate to open the discharge port 45, the extension rod and the first mounting box 416 are driven to rotate until the positions of the infrared receiver 418 and the infrared transmitter 419 are aligned. At this time, the infrared receiver 418 receives the signal and feeds it back to the controller. After receiving the signal, the controller starts the blower to work. Driven by the second spring 420, the support rod 413 resets. When the discharge port 45 is closed, the first mounting box 416 also resets. When the infrared receiver 418 cannot receive the signal of the infrared transmitter 419, the controller controls the blower to turn off. The whole process is that when the discharge port 45 is opened, the feed port 43 is closed, and the blower starts to work. After the discharge port 45 is opened to supplement dust into the storage box 41, the discharge port 45 is closed, and at the same time the blower stops working. The whole process realizes automatic control and reduces manual operation; To avoid uneven distribution and accumulation of dust when it enters the storage box 41 through the conveying pipe 39 and the feed port 43, resulting in caking and affecting subsequent dust removal work, a movable inclined placement plate 424 is provided inside the storage box 41. The dust falls to the high point of the inclined placement plate 424 after passing through the feed port 43 and flows along the inclination angle of the inclined placement plate 424 to the low point, avoiding accumulation at the feed port 43. At the same time, a rotating rod 426 extends from the centrifugal cylinder 32 into the storage box 41 to drive the second cam 427 to rotate. During the rotation of the second cam 427, it intermittently presses the matching block 428. After being pressed, the matching block 428 drives the whole inclined placement plate 424 to vibrate. During the vibration of the inclined placement plate 424, it presses the third spring 425. When the second cam 427 is not in contact with the matching block 428, the third spring 425 drives the inclined placement plate 424 to reset. The whole process repeats to realize the overall vibration of the inclined placement plate 424. The vibration of the inclined placement plate 424 can accelerate the flow of dust on the inclined placement plate 424 to the low point and further avoid the problem of dust caking; A baffle plate 429 is arranged inside the storage box 41. A straight groove is formed on the baffle plate 429. The height of the straight groove is less than the height of the internal space of the storage box 41. When the blower blows the dust out, the dust will not all rush into the discharge port 45 under the restriction of the straight groove, but pass through the straight groove in layers. The dust below passes through the straight groove first and then enters the discharge port 45 along the guiding part 430. This setting avoids the uncontrollable uniformity caused by excessive dust being discharged at one time.

[0029] Embodiment 3: As Figures 14-15 shown, this embodiment further includes the following structure on the basis of Embodiment 1: The internal space of the sector nozzle 46 includes a high-speed area 51, two medium-speed areas 52 and two low-speed areas 53. A spoiler 54 is fixedly arranged at the high-speed area 51. The spoiler 54 is hollow. A diversion groove 55 penetrating through itself is formed on the spoiler 54. The diversion groove 55 is adapted to divert part of the dust and air flow passing through the high-speed area 51 into the medium-speed area 52. An arc-shaped diversion part 56 is arranged on the diversion groove 55; An adjusting plate 57 is arranged between the adjacent medium-speed area 52 and low-speed area 53. A docking rod 59 is arranged at one end of the adjusting plate 57 close to the storage box 41. The other end of the adjusting plate 57 is a swinging end. The docking rod 59 is rotatably installed on the sector nozzle 46. A swinging adjusting mechanism is arranged on the adjusting plate 57. The swinging adjusting mechanism is adapted to drive the swinging end of the adjusting plate 57 to generate an angular offset, thereby changing the flow rate of the dust and air flow passing through the low-speed area 53; A plurality of spaced-apart wind-powered impellers 518 are rotatably installed at the outlet of the sector nozzle 46. The wind-powered impellers 518 are adapted to draw part of the air flow and dust passing through the sector nozzle 46 upward.

[0030] As Figure 14 shown, the swinging adjusting mechanism is a balance weight 58. The balance weight 58 is connected to the swinging end of the adjusting plate 57. The air flow passing through the medium-speed area 52 and the low-speed area 53 is adapted to contact the balance weight 58, thereby driving the adjusting plate 57 to swing to balance the flow rate of the air flow passing through the medium-speed area 52 and the low-speed area 53.

[0031] As Figure 15As shown, the swing adjustment mechanism includes a third drive motor 512, a second driving gear 513, and a second driven gear 514. The third drive motor 512 is installed on the sector nozzle 46. The second driving gear 513 and the second driven gear 514 are both rotatably installed on the sector nozzle 46. The second driving gear 513 meshes with the second driven gear 514. The third drive motor 512 is connected to the second driving gear 513 to drive the second driving gear 513 and the second driven gear 514 to rotate towards each other. A heightening block is provided on the second driving gear 513, and a first shifting plate 516 is provided on the heightening block. A second shifting plate 515 is provided on the second driven gear 514. When the second driving gear 513 and the second driven gear 514 rotate towards each other, the first shifting plate 516 and the second shifting plate 515 do not contact each other. Both of the two docking rods 59 pass through the sector nozzle 46 and extend to the outside of the sector nozzle 46. A fourth spring 511 is sleeved on the extending part of the docking rod 59. The two ends of the fourth spring 511 are respectively connected to the docking rod 59 and the sector nozzle 46. A first force-bearing plate 517 is fixedly sleeved on the docking rod 59 adjacent to the second driving gear 513, and a second force-bearing plate 510 is fixedly sleeved on the docking rod 59 adjacent to the second driven gear 514. The first shifting plate 516 is adapted to be driven to rotate and then squeeze the first force-bearing plate 517, thereby forcing the adjusting plate 57 corresponding to the first force-bearing plate 517 to shift towards the adjacent low-speed area 53. The second shifting plate 515 is adapted to be driven to rotate and then squeeze the second force-bearing plate 510, thereby forcing the adjusting plate 57 corresponding to the second force-bearing plate 510 to shift towards the adjacent low-speed area 53.

[0032] The working principle of this embodiment is as follows: When dust enters the sector nozzle 46 through the discharge port 45 and is discharged into the simulation chamber 1, the setting of the sector nozzle 46 expands the discharge range of the dust and makes the distribution more uniform. The internal space of the sector nozzle 46 is divided into a high-speed area 51, a medium-speed area 52, and a low-speed area 53. A hollow spoiler 54 is provided in the high-speed area 51. When the air flow and dust are discharged through the spoiler 54, part of the air flow and dust will enter the medium-speed area 52 along the diversion groove 55 to achieve the diversion effect and avoid too high a flow rate in the high-speed area 51. To further improve the diversion effect, an arc-shaped diversion part 56 is also provided in the diversion groove 55. When the air flow and dust pass through the spoiler 54, part of them contacts the arc-shaped diversion part 56 and is guided into the medium-speed area 52 along the outer contour of the arc-shaped diversion part 56. In this setting, the problem that the flow rate in the high-speed area 51 is significantly higher than that in the medium-speed area 52 is improved. A swingable adjusting plate 57 is provided between the medium-speed area 52 and the low-speed area 53. One end of the adjusting plate 57 close to the storage tank 41 is the swing origin, and this end is rotatably arranged on the sector nozzle 46 through a docking rod 59. The other end is the swing end, and the cross-sectional area of the channels in the medium-speed area 52 and the low-speed area 53 is changed by the swinging of the swing end, so as to balance the gas flow velocities in the medium-speed area 52 and the low-speed area 53. When the cross-section of the channel is small, the flow velocity increases, and vice versa, the flow velocity slows down; In this embodiment, a balance weight 58 is arranged at the swing end of the adjusting plate 57. The balance weight 58 automatically compensates for the flow velocity difference in a passive adjustment manner. The balance weight 58 is simultaneously affected by the air flow impact forces in the medium-speed area 52 and the low-speed area 53. When the flow velocity in a certain area is too high, the thrust of the air flow in this area on the balance weight 58 increases, forcing the adjusting plate 57 to swing in the opposite direction, thereby achieving the effect of automatically compensating for the flow velocity difference; In another embodiment, an active swinging method is adopted to change the flow rate in the low-speed area 53. The third driving motor 512 is started to drive the second driving gear 513 to rotate. The second driving gear 513 is meshed with the second driven gear 514, thereby realizing the rotation of the second driven gear 514. The second driving gear 513 and the second driven gear 514 rotate in opposite directions due to the meshing relationship. The docking rod 59 that provides the adjustment plate 57 with the ability to rotate at the origin extends out of the fan-shaped nozzle 46. The extended part and the fan-shaped nozzle 46 are connected together with a fourth spring 511. The fourth spring 511 When the adjustment plate 57 is in the initial state, it is located at the center of the low-speed area 53 and the medium-speed area 52. The first force plate 517 is connected to the docking rod 59 corresponding to the second driving gear 513, and the second force plate 510 is connected to the docking rod 59 corresponding to the second driven gear 514. The second driving gear 513 rotates and drives the first toggle plate 516 connected thereto to squeeze the first force plate 517. The squeezed first force plate 517 drives the corresponding docking rod 59 to rotate. At this time, the adjustment plate 57 corresponding to the docking rod 59 deviates to the low-speed area 53. The channel cross section of area 53 is reduced, and the flow rate is increased, while the channel of medium-speed area 52 releases more space due to the offset of the adjustment plate 57, the cross section is relatively increased, and the flow rate is correspondingly reduced, so as to balance the flow rate between the low-speed area 53 and the medium-speed area 52. This part needs to control the rotation direction of the main shaft of the third drive motor 512 to make the second driving gear 513 and the second driven gear 514 rotate to control the first toggle plate 516 to contact with the side of the first force plate 517 close to the second force plate 510 under rotation, and at the same time control the second toggle plate 515 to contact with the second force plate 517 under rotation. The force-bearing plate 510 is in contact with one side close to the first force-bearing plate 517. The cooperation principle between the second force-bearing plate 510 and the second toggle plate 515 is the same as the cooperation principle between the first force-bearing plate 517 and the first toggle plate 516. The difference is that the first toggle plate 516 is connected to the second driving gear 513 through a spacer block, and the second toggle plate 515 is connected to the second driven gear 514. This arrangement prevents the first toggle plate 516 and the second toggle plate 515 from contacting each other during the simultaneous rotation of the second driving gear 513 and the second driven gear 514, thereby causing interference. In order to increase the speed of slowing down the settling of dust of all particle sizes after being ejected, a plurality of wind-driven impellers 518 are provided at the outlet of the fan-shaped nozzle 46. The wind-driven impellers 518 are driven to rotate by airflow, thereby pulling part of the dust upward, prolonging the suspension time, and more realistically simulating the dust diffusion scene in an open space.

[0033] The specific embodiments described above further elaborate on the technical problems solved, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dust environment simulation device, characterized in that, Comprising: A simulation chamber (1), in which a dust concentration detector (2) is installed; A grading component (3), which is installed outside the simulation chamber (1), and the grading component (3) is adapted to screen dust according to particle size; A storage component (4), which is located inside the simulation chamber (1), and the storage component (4) includes a number of storage bins (41). The number of storage bins (41) is adapted to store dust of different particle sizes after screening respectively. The grading component (3) is connected to the storage bin (41) to be adapted to input the graded dust into the storage bin (41). An air inlet pipe (44) is provided on the storage bin (41), and the air inlet pipe (44) is adapted to be externally connected to a blower; A fan-shaped nozzle (46), which is docked with a single storage bin (41) to be adapted to spray the dust in the corresponding storage bin (41) into the simulation chamber (1); A moving mechanism, which is connected to the fan-shaped nozzle (46) to be adapted to drive the fan-shaped nozzle (46) to dock with any one of the storage bins (41), and then cooperate with the blower to spray dust of a specified particle size, so as to adjust the dust concentration in the simulation chamber (1).

2. The dust environment simulation device according to claim 1, wherein The grading component (3) includes: A grading cylinder (31) and a centrifugal cylinder (32) arranged coaxially. The grading cylinder (31) is installed on the simulation chamber (1), and the centrifugal cylinder (32) is rotatably installed inside the grading cylinder (31); A rotation driving mechanism, which is installed on the grading cylinder (31), and the rotation driving mechanism is connected to the centrifugal cylinder (32) to be adapted to drive the centrifugal cylinder (32) to rotate; A number of screen meshes (36) arranged at intervals inside the centrifugal cylinder (32) and in a circular ring shape. The number of screen meshes (36) divides the internal space of the grading cylinder (31) into a plurality of concentric and annular screening chambers (37); A number of conical receiving bins (38) corresponding to the screening chambers (37). The conical receiving bins (38) are connected to the bottom of the grading cylinder (31). Through grooves corresponding to the screening chambers (37) and penetrating through itself are provided in the grading cylinder (31), and the through grooves are respectively communicated with the internal spaces of the corresponding screening chambers (37) and the conical receiving bins (38); Wherein, the sizes of the screen holes of the number of screen meshes (36) gradually become smaller layer by layer outward with the center of the centrifugal cylinder (32) as the center. The centrifugal cylinder (32) is adapted to be driven to rotate to drive the dust to pass through the corresponding screen mesh (36) according to the particle size, and then enter the corresponding conical receiving bin (38); The conical receiving bins (38) are arranged in sequence from outside to inside in the radial direction, and the storage bins (41) are arranged in layers from bottom to top in the vertical direction. The outermost conical receiving bin (38) corresponds to the bottommost storage bin (41), adjacent conical receiving bins (38) correspond to adjacent storage bins (41), and a conveying pipe (39) is provided between the conical receiving bin (38) and the corresponding storage bin (41).

3. The dust environment simulation device according to claim 2, characterized in that, The rotation drive mechanism includes a first drive motor (33), a first driving gear (34), and a first driven gear (35). The first drive motor (33) is installed on the classification cylinder (31). The first driven gear (35) is fixedly sleeved on the centrifugal cylinder (32). The first driving gear (34) is rotatably installed on the classification cylinder (31). The first driven gear (35) meshes with the first driving gear (34). The first drive motor (33) is connected to the first driving gear (34) to drive the first driving gear (34) to rotate. The moving mechanism includes a second drive motor (47), a bracket (48), and a threaded rod (49). The bracket (48) is connected to the storage tank (41). The second drive motor (47) is installed on the bracket (48). The threaded rod (49) is rotatably installed on the bracket (48). The sector nozzle (46) is assembled outside the threaded rod (49). The second drive motor (47) is connected to the threaded rod (49) to drive the threaded rod (49) to rotate, thereby driving the sector nozzle (46) to move along the axis direction of the threaded rod (49). A chute is formed on the storage tank (41), and a slider is arranged on the sector nozzle (46). The slider is slidably arranged in the chute.

4. The dust environment simulation device according to claim 2, wherein, A fixing ring (310) is respectively arranged in a plurality of the screening chambers (37). The fixing ring (310) is fixedly connected to the classification cylinder (31). A plurality of vibration mechanisms arranged at intervals are arranged in the fixing ring (310). The vibration mechanism is adapted to vibrate the corresponding screen (36). The vibration mechanism includes a rotating rod (311), a first cam (312), and a first spring (314). The rotating rod (311) is rotatably installed in the fixing ring (310). The first cam (312) is fixedly sleeved on the outer peripheral surface of the rotating rod (311). The first spring (314) is sleeved outside the rotating rod (311). One end of the first spring (314) is connected to the classification cylinder (31), and the other end of the first spring (314) is connected to the first cam (312). A contact part (313) is arranged on the first cam (312). The contact part (313) contacts the corresponding screen (36). When the screen (36) is driven to rotate, a thrust is generated on the contact part (313), thereby driving the first cam (312) to generate an angular offset. After the first cam (312) generates an angular offset, it is reset through the first spring (314) to impact the corresponding screen (36) to generate vibration.

5. The dust environment simulation device according to claim 2, characterized in that, The storage box (41) is provided with a feed inlet (43) and a discharge outlet (45). The feed inlet (43) is adapted to introduce dust into the storage box (41). An outer roller (415) is fixedly arranged at the discharge outlet (45), and an inner roller (414) is rotatably installed at the discharge outlet (45). The inner roller (414) is located inside the outer roller (415). Matching grooves penetrating through themselves are formed on both the inner roller (414) and the outer roller (415). A support rod (413) is arranged on the inner roller (414). The support rod (413) passes through the outer roller (415) and the storage box (41) to the outside of the storage box (41). A second spring (420) is sleeved on the part of the support rod (413) located outside the storage box (41). One end of the second spring (420) is connected to the storage box (41), and the other end of the second spring (420) is connected to the support rod (413). The support rod (413) is connected to a connecting rod (412) through a one-way bearing. A driving gear (411) is connected to the connecting rod (412). A rack (410) is arranged on the sector nozzle (46). The rack (410) is adapted to move from bottom to top towards the storage box (41) following the sector nozzle (46), so that the rack (410) meshes with the corresponding driving gear (411), thereby driving the driving gear (411), the connecting rod (412), the support rod (413), and the inner roller (414) to rotate, aligning the matching grooves of the outer roller (415) and the inner roller (414) to open the discharge outlet (45). A rotating shaft (422) is rotatably installed on the storage box (41). A switch plate (423) corresponding to the feed inlet (43) is fixedly sleeved on the rotating shaft (422). A synchronous belt (421) is commonly sleeved between the rotating shaft (422) and the support rod (413) through synchronous pulleys. When the inner roller (414) is driven to rotate by an angle to open the discharge outlet (45), the rotating shaft (422) rotates following the support rod (413) through the synchronous belt (421) until the switch plate (423) closes the corresponding feed inlet (43). When the rack (410) is disengaged from meshing with the driving gear (411), the support rod (413) is reset through the second spring (420), thereby driving the inner roller (414) to reset to close the discharge outlet (45), and driving the switch plate (423) to reset to open the feed inlet (43). When the rack (410) moves from top to bottom following the sector nozzle (46) and meshes with the driving gear (411), it cannot drive the support rod (413) to rotate.

6. The dust environment simulation device according to claim 5, characterized in that The connecting rod (412) is hollow. An extension rod is connected to the support rod (413). The extension rod passes through the one-way shaft and the inside of the connecting rod (412) to the outside of the connecting rod (412). A first mounting box (416) is connected to the protruding part of the extension rod. An infrared receiver (418) is mounted on the first mounting box (416). A controller is arranged inside the first mounting box (416). A second mounting box (417) is arranged on the storage box (41). An infrared transmitter (419) is mounted on the second mounting box (417). The infrared receiver (418) is connected to the controller. The controller is connected to an externally connected blower. The first mounting box (416) is adapted to rotate with the inner roller (414). When the inner roller (414) is driven to rotate to open the discharge port (45), the infrared receiver (418) is aligned with the infrared transmitter (419). The infrared receiver (418) is adapted to feedback the received signal to the controller, and the controller is adapted to start the blower after receiving the signal.

7. The dust environment simulation device according to claim 5 or 6, characterized in that, An inclined placement plate (424) is movably arranged inside the storage box (41). The high end of the inclined placement plate (424) is located at the feed port (43), and the low end of the inclined placement plate (424) is located at the discharge port (45). A number of third springs (425) are arranged at intervals on both sides of the inclined placement plate (424). The two ends of the third spring (425) are respectively connected to the inclined placement plate (424) and the storage box (41); A rotating rod (426) is connected to the bottom of the centrifugal cylinder (32). The rotating rod (426) passes through the classification cylinder (31) and all the storage boxes (41). A number of second cams (427) corresponding to the storage boxes (41) are fixedly sleeved on the rotating rod (426). A matching block (428) is arranged at the high end of the inclined placement plate (424). The second cam (427) is adapted to be driven to rotate and intermittently squeeze the matching block (428) to drive the corresponding inclined placement plate (424) to vibrate; A baffle (429) is arranged inside the storage box (41). The baffle (429) is adjacent to the discharge port (45). A guiding part (430) is arranged on the baffle (429). The guiding part (430) is in contact with the fitting groove of the outer roller (415). A straight groove penetrating through itself is formed on the baffle (429). The straight groove is adapted to guide the dust to the guiding part (430), so that the dust enters the fitting groove of the outer roller (415).

8. The dust environment simulation device according to claim 2 or 6, characterized in that, The internal space of the fan-shaped nozzle (46) comprises a high-speed region (51), two medium-speed regions (52) and two low-speed regions (53); a spoiler (54) is fixedly arranged at the high-speed region (51); the spoiler (54) is hollow; a diversion groove (55) is provided on the spoiler (54) and runs through the spoiler; the diversion groove (55) is suitable for diverting part of the dust and airflow passing through the high-speed region (51) into the medium-speed region (52); and an arc-shaped diversion portion (56) is provided on the diversion groove (55); An adjustment plate (57) is provided between the adjacent medium-speed area (52) and the low-speed area (53); a docking rod (59) is provided on one end of the adjustment plate (57) close to the storage box (41); the other end of the adjustment plate (57) is a swing end; the docking rod (59) is rotatably mounted on the fan-shaped nozzle (46); a swing adjustment mechanism is provided on the adjustment plate (57); the swing adjustment mechanism is suitable for driving the swing end of the adjustment plate (57) to produce an angular deviation, thereby changing the flow rate of the dust and airflow passing through the low-speed area (53); A plurality of wind-powered impellers (518) arranged at intervals are rotatably mounted at the outlet of the fan-shaped nozzle (46), and the wind-powered impellers (518) are suitable for pulling part of the airflow and dust passing through the fan-shaped nozzle (46) upwards.

9. The dust environment simulation device according to claim 8, characterized in that The swing adjustment mechanism is a balancing block (58), and the balancing block (58) is connected to the swing end of the adjustment plate (57). The airflow passing through the medium-speed area (52) and the low-speed area (53) is suitable for contacting the balancing block (58), thereby driving the adjustment plate (57) to swing to balance the flow rate of the airflow passing through the medium-speed area (52) and the low-speed area (53).

10. The dust environment simulation device according to claim 8, characterized in that The swing adjustment mechanism comprises a third drive motor (512), a second driving gear (513) and a second driven gear (514); the third drive motor (512) is mounted on the fan-shaped nozzle (46); the second driving gear (513) and the second driven gear (514) are both rotatably mounted on the fan-shaped nozzle (46); the second driving gear (513) is meshed with the second driven gear (514); the third drive motor (512) is connected to the second driving gear (513) so as to drive the second driving gear (513) and the second driven gear (514) to rotate in opposite directions; a pad is provided on the second driving gear (513); a first toggle plate (516) is provided on the pad; a second toggle plate (515) is provided on the second driven gear (514); when the second driving gear (513) and the second driven gear (514) rotate in opposite directions, the first toggle plate (516) and the second toggle plate (515) do not contact each other; The two docking rods (59) both pass through the fan-shaped nozzle (46) and extend out of the fan-shaped nozzle (46); a fourth spring (511) is sleeved on the extended portion of the docking rod (59); two ends of the fourth spring (511) are respectively connected to the docking rod (59) and the fan-shaped nozzle (46); a first force plate (517) is fixedly sleeved on the docking rod (59) adjacent to the second driving gear (513); and a first force plate (517) is fixedly sleeved on the docking rod (59) adjacent to the second driven gear (514). The second force-bearing plate (510), the first shifting plate (516) is suitable for being driven to rotate and thereby causing compression on the first force-bearing plate (517), thereby forcing the adjustment plate (57) corresponding to the first force-bearing plate (517) to shift toward the adjacent low-speed area (53), and the second shifting plate (515) is suitable for being driven to rotate and thereby causing compression on the second force-bearing plate (510), thereby forcing the adjustment plate (57) corresponding to the second force-bearing plate (510) to shift toward the adjacent low-speed area (53).

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