A dry powder discharge device for simulating a dust environment

Abstract

The application provides a dry powder spraying device for simulating a dust environment, comprising a rack, a powder supply barrel, a nozzle, a gas supply mechanism, a powder storage barrel, a material blocking disc, a first rotating disc, a rotating driving mechanism and a switch mechanism. The dry powder spraying device for simulating a dust environment does not need to stop operation when adding powder, and can automatically and quantitatively convey a certain weight specification of powder into the powder supply barrel every time the powder supply barrel is added, without manual weighing, ensuring the accuracy of the weight of the added powder, so that the scene of dust dispersion that can be achieved by a certain weight unit of powder can be accurately simulated, meeting the experimental requirements.

Description

Technical Field

[0001] This invention relates to the field of dust environment testing technology, and specifically to a dry powder spraying device for simulating dust environments. Background Technology

[0002] Dust environment simulation experiments are mainly used to study dust conditions under specific time, space, and dust spray volume. By constructing artificial models, relatively realistic dust environments can be simulated. Furthermore, these artificial models allow for repeated simulation experiments, thus meeting experimental requirements. Dry powder extinguishing agents are dry and easily flowing fine solid powders. They are characterized by rapid fire extinguishing speed and have been widely used in the fire protection field. Dry powder is also frequently used as a raw material for dust in simulated dust environment experiments.

[0003] Currently, the experimental equipment for simulating dust environments on the market is neither perfect nor comprehensive. For example, the addition of powder is usually done manually in advance into the powder container, and the amount of powder to be added can only be determined by weighing beforehand. If powder needs to be added during the experiment, it may be necessary to stop the machine, thus failing to meet the needs of the experiment. At the same time, if the amount of powder added is not guaranteed, problems such as substandard or uncontrollable simulated dust concentrations can easily occur. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a dry powder spraying device for simulating a dust environment, so as to realize the automatic and quantitative addition of powder and meet experimental requirements.

[0005] To achieve the above objectives, the present invention provides a dry powder spraying device for simulating a dust environment, comprising: a frame; a powder supply tank disposed on the frame, the powder supply tank having a powder suction pipe and a feed inlet, and a powder pump disposed at one end of the powder suction pipe extending outside the powder supply tank; a nozzle connected to the powder pump, the nozzle being used to disperse the sprayed powder; an air supply mechanism connected to the powder pump, the air supply mechanism being used to draw out the powder from the powder supply tank and transport it to the nozzle; a powder storage tank disposed on the frame and located above the powder supply tank, the bottom of the powder storage tank having a discharge cylinder; and a baffle plate disposed on the frame, the baffle plate having a first guide cylinder movably sleeved outside the discharge cylinder.

[0006] A first turntable is rotatably disposed below the baffle plate, and the first turntable rests against the bottom surface of the baffle plate. A first distributing cylinder is provided at each end of the first turntable, and the first distributing cylinder is provided with a first cover. The first cover is used to open or close the opening at the bottom of the first distributing cylinder. When one of the first distributing cylinders is connected to the first guide cylinder, the other first distributing cylinder is connected to the feed inlet. A rotary drive mechanism is used to drive the first turntable to rotate. A switching mechanism is used to keep both first covers closed. When the first distributing cylinder is connected to the feed inlet, the switching mechanism can drive the corresponding first cover to open or close.

[0007] Preferably, the first cover is hinged to the first dispensing cylinder, the hinge position of the first cover and the first dispensing cylinder is close to the rotation axis of the first turntable, and the first cover extends towards the rotation axis of the first turntable to form a connecting block;

[0008] The switching mechanism includes a support shaft, a limiting cylinder, and a drive assembly. The support shaft is fixed on the frame and located below the first turntable. The limiting cylinder is disposed on the support shaft and located between the two first dispensing cylinders. The axis of the limiting cylinder, the axis of the support shaft, and the rotation axis of the first turntable coincide.

[0009] The end face of the limiting cylinder opposite to the first turntable has a stop surface, and the stop surface is recessed upward to form a clearance notch, which penetrates the side wall of the limiting cylinder; when the connecting block abuts against the stop surface, the first cover closes the bottom opening of the first dispensing cylinder; when the connecting block is located in the clearance notch, the driving component can drive the connecting block to rotate, so that the first cover opens or closes the bottom opening of the first dispensing cylinder.

[0010] Preferably, the driving assembly includes a driving block and a first cylinder. The driving block extends into the limiting cylinder and is bent towards the clearance notch to form a first lug. The bottom surface of the first lug is flush with the abutment surface. When the connecting block is located within the clearance notch, the connecting block abuts against the bottom surface of the first lug. The first cylinder is mounted on the support shaft and is used to drive the driving block to perform lifting and lowering actions.

[0011] Preferably, the drive block is provided with a second lug, which is located below the first lug, and a gap is formed between the second lug and the first lug to allow the connecting block to pass through.

[0012] Preferably, the first dispensing cylinder is covered by a second guiding cylinder, which is connected to the feed inlet. The first baffle is hinged to the second guiding cylinder and located inside the second guiding cylinder. The connecting block extends out of the second guiding cylinder. The feed inlet is provided with a second baffle, which is rotatably fitted to the top of the powder supply hopper. The powder supply hopper is provided with a first reset member, which is used to provide a reset spring force to the second baffle so that the second guiding cylinder pushes open the second baffle and resets itself.

[0013] Preferably, it further includes a second turntable and two second distribution cylinders. The second turntable is disposed between the first turntable and the baffle plate. The second turntable is attached to the bottom surface of the baffle plate. The two second distribution cylinders are respectively disposed at both ends of the second turntable. Each second distribution cylinder is movably inserted into the corresponding first distribution cylinder and can communicate with the first guide cylinder.

[0014] The rotary drive mechanism is used to synchronously drive the first turntable and the second turntable to rotate, or to drive the second turntable to perform lifting and lowering actions; the baffle plate is lifted and lowered on the frame, and the baffle plate is provided with a reset component, which is used to provide a reset spring force to the baffle plate so that the baffle plate abuts against the top surface of the second turntable.

[0015] Preferably, the rotary drive mechanism includes: a rotating shaft that is movably inserted into the support shaft and arranged coaxially with the support shaft, the top of the rotating shaft being connected to the first turntable, and the bottom of the rotating shaft extending out of the support shaft; a worm gear that is fixedly sleeved on the rotating shaft; a worm that meshes with the worm gear for transmission; a motor that is mounted on the frame and connected to the worm; a splined shaft that is movably inserted into the rotating shaft and arranged coaxially with the rotating shaft, the top of the splined shaft being connected to the second turntable, and the bottom of the splined shaft extending out of the rotating shaft; and a second cylinder that is mounted on the frame and located at the bottom of the splined shaft, the piston rod of the second cylinder being rotatably connected to the splined shaft.

[0016] Preferably, the reset assembly includes a support plate, two guide rods, and two second reset members. The support plate is disposed on the frame and located above the baffle plate. The two guide rods are respectively movably inserted through the support plate in a vertical direction. The bottom of the guide rods is connected to the baffle plate. The second reset members are inserted outside the guide rods and abut against the baffle plate and the support plate respectively.

[0017] Preferably, the powder supply hopper is provided with a microporous plate, which divides the inner cavity of the powder supply hopper into an upper chamber and a lower chamber. The upper chamber is connected to the feed inlet, and the powder suction pipe is located in the upper chamber. The powder supply hopper is provided with an air inlet connector, which is connected to the lower chamber and the air supply mechanism respectively.

[0018] The beneficial effects of this invention are:

[0019] This invention discloses a dry powder spraying device for simulating a dust environment. No machine shutdown is required during feeding. Each time powder is added to the powder supply hopper, a certain weight of powder is automatically and quantitatively delivered into the hopper without manual weighing, ensuring the accuracy of the feeding weight. This allows for precise simulation of the dust dispersion scenario achievable with a certain weight of powder, thus meeting experimental requirements. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of a dry powder spraying device for simulating a dust environment provided in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the frame structure;

[0023] Figure 3 This is a schematic diagram of the internal structure of the rack;

[0024] Figure 4 for Figure 2 A schematic diagram of the structure after the rack is hidden in this state;

[0025] Figure 5 This is a schematic diagram of the structure of the first turntable and the two first distribution cylinders.

[0026] Figure 6 for Figure 5 A cross-sectional view under the condition;

[0027] Figure 7 This is a schematic diagram of the switching mechanism;

[0028] Figure 8 for Figure 7 A cross-sectional view under the condition;

[0029] Figure 9 This is a schematic diagram of the structure of the second turntable and the spline shaft in operation;

[0030] Figure 10 This is a schematic diagram of the structure in which the second dispensing cylinder and the first dispensing cylinder work together.

[0031] Figure 11 for Figure 10 A cross-sectional view under the condition;

[0032] Figure 12 A cross-sectional schematic diagram showing the cooperation between the baffle plate, the first turntable, and the second turntable;

[0033] Figure 13 for Figure 4 A cross-sectional view under the condition;

[0034] Figure label:

[0035] 10-Rack;

[0036] 20-Powder supply hopper, 21-Powder suction pipe, 22-Feed inlet, 23-Powder pump, 24-Second baffle, 25-First reset component, 26-Micro plate, 27-Air inlet connector;

[0037] 30 - Powder storage hopper, 31 - Discharge cylinder;

[0038] 40-Baffle plate, 41-First guide cylinder, 42-Support plate, 43-Guide rod, 44-Second reset component;

[0039] 50-First turntable, 51-First material distribution cylinder, 52-First baffle, 53-Connecting block, 54-Second guide cylinder;

[0040] 60- Rotary drive mechanism, 61- Rotating shaft, 62- Worm gear, 63- Worm, 64- Motor, 65- Splined shaft, 66- Second cylinder;

[0041] 70-Switch mechanism, 71-Support shaft, 72-Limiting cylinder, 721-Blocking surface, 722-Leaving notch, 73-Drive block, 731-First lug, 732-Second lug, 74-First cylinder;

[0042] 80 - Second turntable, 81 - Second feed cylinder. Detailed Implementation

[0043] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0044] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0046] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] like Figure 1-13 As shown, in one embodiment of the present invention, a dry powder spraying device for simulating a dust environment is provided, including a frame 10, a powder supply tank 20, a nozzle, an air supply mechanism, a powder storage tank 30, a baffle plate 40, a first turntable 50, a rotary drive mechanism 60, and a switching mechanism 70.

[0050] The powder supply hopper 20, powder storage hopper 30, baffle plate 40, rotary drive mechanism 60, and switch mechanism 70 are all mounted on the frame 10. The powder supply hopper 20 is equipped with a powder suction pipe 21 and a feed inlet 22. A powder pump 23 is provided at the end of the powder suction pipe 21 that extends out of the powder supply hopper 20. The nozzle and the air supply mechanism are respectively connected to the powder pump 23. The nozzle is used to disperse the sprayed powder (i.e., dry powder), and the air supply mechanism is used to suck out the powder in the powder supply hopper 20 and transport it to the nozzle.

[0051] The powder storage hopper 30 is located above the powder supply hopper 20, and the bottom of the powder storage hopper 30 is provided with a discharge cylinder 31. The baffle plate 40 is provided with a first guide cylinder 41, which is movably sleeved outside the discharge cylinder 31. The first turntable 50 is rotatably arranged below the baffle plate 40. The diameter of the first turntable 50 is the same as that of the baffle plate 40. The first turntable 50 is attached to the bottom surface of the baffle plate 40. The two ends of the first turntable 50 are respectively provided with first distribution cylinders 51. The first distribution cylinder 51 is provided with a first cover 52. The first cover 52 is used to open or close the opening at the bottom of the first distribution cylinder 51. When one of the first distribution cylinders 51 is connected to the first guide cylinder 41, the other first distribution cylinder 51 is connected to the feed inlet 22. The rotary drive mechanism 60 is used to drive the first turntable 50 to rotate, and the switch mechanism 70 is used to keep the two first baffles 52 in a closed state. When the first feed cylinder 51 is connected to the feed inlet 22, the switch mechanism 70 can drive the corresponding first baffle 52 to open or close.

[0052] See Figure 1 The air supply mechanism is connected to the powder pump 23 via a first pipeline, and the powder pump 23 is connected to the nozzle via a second pipeline. The first pipeline, along the air supply direction, is sequentially equipped with a high-pressure reducing valve, a spraying solenoid valve, and a first pressure regulating valve. A third pipeline and a fourth pipeline are also connected to the first pipeline. One end of the third pipeline is connected to the first pipeline between the spraying solenoid valve and the first pressure regulating valve, and the other end is connected to the air inlet connector 27 (described further below). A cleaning solenoid valve is installed on the fourth pipeline. One end of the fourth pipeline is connected to the first pipeline between the high-pressure reducing valve and the spraying solenoid valve, and the other end is connected to the powder pump 23. The structure and working principle of the above-mentioned components are existing technology and will not be described in detail in this embodiment.

[0053] When the powder spraying device is in operation, the rotary drive mechanism 60 first drives the first turntable 50 to rotate, aligning one of the first distribution cylinders 51 with the first guide cylinder 41. At this time, the other first distribution cylinder 51 is connected to the feed inlet 22. Then, the powder storage tank 30 opens its outlet, conveying the powder through the outlet cylinder 31 and the first guide cylinder 41 into the first distribution cylinder 51. After the powder fills the first distribution cylinder 51, the powder overflowing from the top of the first distribution cylinder 51 will be placed in the first guide cylinder 41. Then, the rotary drive mechanism 60 drives the first turntable 50 to rotate at a 90-degree angle, connecting the first distribution cylinder 51 containing the powder with the feed inlet 22 of the powder supply tank 20. During this process, due to the presence of the baffle plate 40 and the first guide cylinder 41, excess powder (the powder located in the first guide cylinder 41) will be intercepted by the first guide cylinder 41. Since the first turntable 50 always blocks the opening at the bottom of the first guide cylinder 41, the powder in the first guide cylinder 41 will not leak down. Only when the other first distribution cylinder 51 is aligned with the first guide cylinder 41 will the powder in the first guide cylinder 41 fall into the first distribution cylinder 51.

[0054] Meanwhile, the switching mechanism 70 keeps the two first covers 52 closed to their respective first dispensing cylinders 51, ensuring that the powder does not leak out. When the first dispensing cylinder 51 containing a certain weight of powder is connected to the inlet 22 of the powder supply tank 20, the switching mechanism 70 first drives the corresponding first cover 52 to open, and the powder in the first dispensing cylinder 51 will fall into the powder supply tank 20. After the air supply mechanism is activated, the powder in the powder supply tank 20 will be sucked into the powder suction pipe 21 and finally sprayed out from the nozzle. The nozzle can disperse the sprayed powder, thereby simulating the dust dispersion scenario.

[0055] This embodiment discloses a dry powder spraying device for simulating a dust environment. No machine shutdown is required during material feeding. Each time material is added to the powder supply tank 20, a certain weight of powder is automatically and quantitatively delivered into the powder supply tank 20 without manual weighing, ensuring the accuracy of the added weight. This allows for precise simulation of the dust dispersion scenario achievable with a certain weight of powder, thus meeting experimental requirements.

[0056] In one embodiment, the first baffle 52 is hinged to the first dispensing cylinder 51, and the hinge position of the first baffle 52 and the first dispensing cylinder 51 is close to the rotation axis 61 of the first turntable 50. The first baffle 52 extends towards the rotation axis 61 of the first turntable 50 to form a connecting block 53. The switching mechanism 70 includes a support shaft 71, a limiting cylinder 72, and a drive assembly. The support shaft 71 is fixed on the frame 10 and located below the first turntable 50. The limiting cylinder 72 is disposed on the support shaft 71 and located between the two first dispensing cylinders 51. The axis of the limiting cylinder 72, the axis of the support shaft 71, and the rotation axis 61 of the first turntable 50 coincide.

[0057] The end face of the limiting cylinder 72 facing away from the first turntable 50 has a stop surface 721. The stop surface 721 is recessed upward to form a clearance notch 722, which penetrates the side wall of the limiting cylinder 72. When the connecting block 53 abuts against the stop surface 721, the first cover 52 closes the bottom opening of the first dispensing cylinder 51. When the connecting block 53 is located within the clearance notch 722, the drive assembly can drive the connecting block 53 to rotate, so that the first cover 52 opens or closes the bottom opening of the first dispensing cylinder 51.

[0058] The hinge position between the first cover 52 and the first dispensing cylinder 51 is located between the first cover 52 and the connecting block 53. Therefore, when the connecting block 53 abuts against the abutting surface 721, the first cover 52 will always close the bottom opening of the first dispensing cylinder 51. Even if the connecting block 53 rotates relative to the limiting cylinder 72, as long as the connecting block 53 abuts against the abutting surface 721, the first cover 52 will not open the bottom opening of the first dispensing cylinder 51.

[0059] When one of the first dispensing cylinders 51 is connected to the inlet 22 of the powder supply hopper 20, the corresponding connecting block 53 will be located within the clearance notch 722. At this time, since the connecting block 53 is not restricted by the abutment surface 721, but only by the drive assembly, the drive assembly can drive the connecting block 53 to rotate, so that the connecting block 53 drives the first baffle 52 to open the bottom opening of the first dispensing cylinder 51, and the powder in the first dispensing cylinder 51 will fall into the powder supply hopper 20. Then, the drive assembly drives the connecting block 53 to rotate and reset, so that the first baffle 52 closes the bottom opening of the first dispensing cylinder 51 again. In this way, the rotary drive mechanism 60 can drive the first turntable 50 to rotate again, and the connecting block 53 will re-contact the abutment surface 721, so that the first baffle 52 always remains closed.

[0060] In one embodiment, the drive assembly includes a drive block 73 and a first cylinder 74. The drive block 73 extends into the limiting cylinder 72 and is bent towards the clearance notch 722 to form a first lug 731. The bottom surface of the first lug 731 is flush with the abutment surface 721. When the connecting block 53 is located within the clearance notch 722, the connecting block 53 abuts against the bottom surface of the first lug 731. The first cylinder 74 is mounted on the support shaft 71 and is used to drive the drive block 73 to perform lifting and lowering actions.

[0061] Specifically, when the first turntable 50 rotates, causing one of the first dispensing cylinders 51 to connect with the feed inlet 22 of the powder supply tank 20, the corresponding connecting block 53 will move into the clearance notch 722 and disengage from the abutment surface 721. Furthermore, the connecting block 53 is positioned below the first lug 731, which blocks the connecting block 53, thus preventing the first cover 52 from rotating and opening the bottom opening of the first dispensing cylinder 51. When the first cylinder 74 extends its piston rod, the first lug 731 moves upward along with the drive block 73. In this way, according to the lever principle, the powder in the first dispensing cylinder 51 will press down on the first cover 52 and fall from the first dispensing cylinder 51 into the feed inlet 22. The connecting block 53 will also rotate with the first cover 52 and abut against the bottom surface of the first lug 731.

[0062] After the powder has completely fallen into the powder supply hopper 20, the first cylinder 74 retracts its piston rod, the first lug 731 moves downward and presses down on the connecting block 53, thereby driving the first cover 52 to rotate and close the bottom opening of the first distributing cylinder 51.

[0063] In one embodiment, the drive block 73 is provided with a second lug 732, which is located below the first lug 731, and a gap is formed between the second lug 732 and the first lug 731 for the connecting block 53 to pass through. The design of the second lug 732 is such that it can push the connecting block 53 as the drive block 73 rises, thereby facilitating the opening of the first cover 52.

[0064] In one embodiment, a second guide cylinder 54 is provided over the first dispensing cylinder 51. The second guide cylinder 54 can communicate with the feed inlet 22. A first baffle 52 is hinged to the second guide cylinder 54 and located inside the second guide cylinder 54. A connecting block 53 extends out of the second guide cylinder 54. The feed inlet 22 is provided with a second baffle 24, which is rotatably fitted on the top of the powder supply hopper 20. The powder supply hopper 20 is provided with a first reset member 25, which provides a reset spring force to the second baffle 24 so that the second guide cylinder 54 returns to its original position after pushing open the second baffle 24.

[0065] During the rotation of the first turntable 50 driven by the rotary drive mechanism 60, the second guide cylinder 54 gradually pushes open the second stop cover 24, and the first reset member 25 further deforms. After the second guide cylinder 54 is fully connected to the feed inlet 22, the switching mechanism 70 can open the first stop cover 52, allowing the powder in the first distributing cylinder 51 to fall into the powder supply hopper 20. After the second guide cylinder 54 rotates and leaves the feed inlet 22, the first reset member 25 will drive the second stop cover 24 to reset and reseal the feed inlet 22. By designing the second guide cylinder 54 and the second stop cover 24, dust dispersion generated during the powder's fall is avoided. At the same time, the powder supply hopper 20 is isolated from the external space, ensuring the normal operation of the air supply mechanism. The first reset member 25 is a tension spring.

[0066] In one embodiment, the powder spraying device further includes a second turntable 80 and two second distribution cylinders 81. The second turntable 80 is located between the first turntable 50 and the baffle plate 40, and the diameter of the second turntable 80 is the same as that of the first turntable 40. The second turntable 80 abuts against the bottom surface of the baffle plate 40. The two second distribution cylinders 81 are respectively located at both ends of the second turntable 80. Each second distribution cylinder 81 is movably inserted into the corresponding first distribution cylinder 51 and can communicate with the first guide cylinder 41. The rotary drive mechanism 60 is used to synchronously drive the first turntable 50 and the second turntable 80 to rotate, or to drive the second turntable 80 to perform lifting and lowering actions. The baffle plate 40 is lifted and fitted onto the frame 10. The baffle plate 40 is provided with a reset assembly, which is used to provide a reset spring force to the baffle plate 40 so that the baffle plate 40 abuts against the top surface of the second turntable 80.

[0067] After the rotary drive mechanism 60 drives the second turntable 80 to rise, the second turntable 80 will push the material blocking plate 40 upward, causing it to move upward as well. The second dispensing cylinder 81 will also extend partially out of the first dispensing cylinder 51. In this way, the space capacity formed by the combination of the second dispensing cylinder 81 and the first dispensing cylinder 51 will increase, thereby realizing the change of powder supply and meeting different experimental needs.

[0068] Meanwhile, the design of the baffle plate 40 and the reset component ensures that the baffle plate 40 and the second turntable 80 are always in close contact, thereby ensuring the accuracy of material feeding.

[0069] In one embodiment, the rotary drive mechanism 60 includes a rotating shaft 61, a worm gear 62, a worm 63, a motor 64, a splined shaft 65, and a second cylinder 66. The rotating shaft 61 is movably inserted into and coaxially arranged within a support shaft 71. The top of the rotating shaft 61 is connected to a first turntable 50, and the bottom of the rotating shaft 61 extends out of the support shaft 71. The worm gear 62 is fixedly sleeved on the outside of the rotating shaft 61, and the worm 63 meshes with the worm gear 62 for transmission. The motor 64 is mounted on the frame 10 and connected to the worm 63. The splined shaft 65 is movably inserted into and coaxially arranged within the rotating shaft 61. The top of the splined shaft 65 is connected to a second turntable 80, and the bottom of the splined shaft 65 extends out of the rotating shaft 61. The second cylinder 66 is mounted on the frame 10 and located at the bottom of the splined shaft 65. The piston rod of the second cylinder 66 is rotatably connected to the splined shaft 65.

[0070] When it is necessary to drive the first turntable 50 and the second turntable 80 to rotate, the motor 64 drives the worm gear 63 to drive the worm wheel 62 to rotate, which in turn drives the rotating shaft 61 to rotate. Due to the cooperation relationship between the rotating shaft 61 and the support shaft 71, the rotating shaft 61 and the spline shaft 65, and the spline shaft 65 and the second cylinder 66, the first turntable 50 and the second turntable 80 can be driven to rotate synchronously.

[0071] When the powder supply needs to be changed, the second cylinder 66 will lift or pull the spline shaft 65, thereby driving the second turntable 80 to move up and down, thus changing the height of the second dispensing cylinder 81 relative to the first dispensing cylinder 51, and adjusting the capacity of the space formed by the combination of the second dispensing cylinder 81 and the first dispensing cylinder 51. When the rotating shaft 61 and the spline shaft 65 rotate, the spline shaft 65 can also rotate relative to the piston rod of the second cylinder 66.

[0072] In one embodiment, the reset assembly includes a support plate 42, two guide rods 43, and two second reset members 44. The support plate 42 is mounted on the frame 10 and located above the baffle plate. The two guide rods 43 are vertically movably inserted through the support plate 42, with their bottoms connected to the baffle plate 40. The second reset members 44 are inserted outside the guide rods 43 and abut against both the baffle plate 40 and the support plate 42. The second reset members 44 are springs. When the second turntable 80 pushes upward against the baffle plate 40, the baffle plate 40 and the support plate 42 further compress the second reset members 44. During the reset process of the second turntable 80, the second reset members 44 can also drive the baffle plate 40 to reset.

[0073] In one embodiment, the powder supply tank 20 is provided with a microperforated plate 26, which divides the inner cavity of the powder supply tank 20 into an upper chamber and a lower chamber. The upper chamber is connected to the feed inlet 22, and the powder suction pipe 21 is located in the upper chamber. The powder supply tank 20 is provided with an air inlet connector 27, which is connected to the lower chamber and the air supply mechanism respectively.

[0074] Because the powder is quite fine, when stored in the powder supply tank 20 for a long time, the gaps between the powder particles decrease, causing a sedimentation and compaction effect. This results in poor powder flowability, making it unsuitable for spraying. Therefore, by improving the internal structure of the powder supply tank 20, the gas supply mechanism delivers gas at a certain pressure and flow rate to the air inlet 27. The gas then enters the upper chamber from the lower chamber through the microporous plate 26. Under the action of the gas, the gaps between the powder particles increase, thereby achieving the effect of loosening the powder.

[0075] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A dry powder spraying device for simulating a dust environment, characterized in that, include: frame; A powder supply hopper is mounted on the frame. The powder supply hopper is equipped with a powder suction pipe and a feed inlet. A powder pump is installed at the end of the powder suction pipe that extends out of the powder supply hopper. A nozzle, connected to the powder pump, is used to disperse the sprayed powder. An air supply mechanism is connected to the powder pump and is used to draw out the powder from the powder supply tank and deliver it to the nozzle. A powder storage hopper is mounted on the frame and located above the powder supply hopper, and a discharge cylinder is provided at the bottom of the powder storage hopper; A baffle plate is provided on the frame, and a first guide cylinder is provided on the baffle plate. The first guide cylinder is movably sleeved outside the discharge cylinder. A first turntable is rotatably disposed below the baffle plate. The first turntable is attached to the bottom surface of the baffle plate. A first distribution cylinder is provided at each end of the first turntable. The first distribution cylinder is provided with a first cover. The first cover is used to open or close the opening at the bottom of the first distribution cylinder. When one of the first distribution cylinders is connected to the first guide cylinder, the other first distribution cylinder is connected to the feed port. A rotary drive mechanism for driving the first turntable to rotate; and A switching mechanism is used to keep the two first covers closed. When the first dispensing cylinder is connected to the feed inlet, the switching mechanism can drive the corresponding first cover to open or close. The first baffle is hinged to the first dispensing cylinder. The hinge position of the first baffle and the first dispensing cylinder is close to the rotation axis of the first turntable. The first baffle extends towards the rotation axis of the first turntable to form a connecting block. The switching mechanism includes a support shaft, a limiting cylinder, and a drive assembly. The support shaft is fixed on the frame and located below the first turntable. The limiting cylinder is disposed on the support shaft and located between the two first dispensing cylinders. The axis of the limiting cylinder, the axis of the support shaft, and the rotation axis of the first turntable coincide. The end face of the limiting cylinder opposite to the first turntable has a stop surface, and the stop surface is recessed upward to form a clearance notch, which penetrates the side wall of the limiting cylinder; when the connecting block abuts against the stop surface, the first cover closes the bottom opening of the first dispensing cylinder; when the connecting block is located in the clearance notch, the driving component can drive the connecting block to rotate, so that the first cover opens or closes the bottom opening of the first dispensing cylinder; The first material distribution cylinder is covered by a second material guide cylinder, which can communicate with the feed inlet. The first baffle is hinged to the second material guide cylinder and located inside the second material guide cylinder. The connecting block extends out of the second material guide cylinder. The feed inlet is provided with a second cover, which is rotatably fitted on the top of the powder supply hopper. The powder supply hopper is provided with a first reset member, which is used to provide a reset spring force to the second cover so that the second guide cylinder pushes open the second cover and resets it.

2. The dry powder spraying device for simulating a dust environment according to claim 1, characterized in that, The drive assembly includes a drive block and a first cylinder. The drive block extends into the limiting cylinder and is bent toward the clearance notch to form a first lug. The bottom surface of the first lug is flush with the abutment surface. When the connecting block is located within the clearance notch, the connecting block abuts against the bottom surface of the first lug. The first cylinder is mounted on the support shaft and is used to drive the drive block to perform lifting and lowering actions.

3. The dry powder spraying device for simulating a dust environment according to claim 2, characterized in that, The drive block is provided with a second lug, which is located below the first lug, and a gap is formed between the second lug and the first lug to allow the connecting block to pass through.

4. The dry powder spraying device for simulating a dust environment according to claim 2, characterized in that, It also includes a second turntable and two second distribution cylinders. The second turntable is located between the first turntable and the baffle plate. The second turntable is attached to the bottom surface of the baffle plate. The two second distribution cylinders are respectively located at both ends of the second turntable. Each second distribution cylinder is movably inserted into the corresponding first distribution cylinder and can communicate with the first guide cylinder. The rotary drive mechanism is used to synchronously drive the first turntable and the second turntable to rotate, or to drive the second turntable to perform lifting and lowering actions; the baffle plate is lifted and lowered on the frame, and the baffle plate is provided with a reset component, which is used to provide a reset spring force to the baffle plate so that the baffle plate abuts against the top surface of the second turntable.

5. The dry powder spraying device for simulating a dust environment according to claim 4, characterized in that, The rotary drive mechanism includes: A rotating shaft is movably inserted inside the support shaft and arranged coaxially with the support shaft. The top of the rotating shaft is connected to the first turntable, and the bottom of the rotating shaft extends out of the support shaft. The worm gear is fixedly sleeved outside the rotating shaft; The worm gear meshes with the worm wheel for transmission; An electric motor is mounted on the frame and connected to the worm gear; A splined shaft, which is movably inserted within the rotating shaft and arranged coaxially with the rotating shaft, has its top connected to the second turntable and its bottom extending beyond the rotating shaft; and The second cylinder is mounted on the frame and located at the bottom of the spline shaft, and the piston rod of the second cylinder is rotatably connected to the spline shaft.

6. The dry powder spraying device for simulating a dust environment according to claim 4, characterized in that, The reset assembly includes a support plate, two guide rods, and two second reset components. The support plate is mounted on the frame and located above the baffle plate. The two guide rods are vertically movably inserted through the support plate, and the bottom of the guide rods is connected to the baffle plate. The second reset components are inserted through the guide rods and abut against the baffle plate and the support plate, respectively.

7. The dry powder spraying device for simulating a dust environment according to claim 1, characterized in that, The powder supply bin is equipped with a microporous plate, which divides the inner cavity of the powder supply bin into an upper chamber and a lower chamber. The upper chamber is connected to the feed inlet, and the powder suction pipe is located in the upper chamber. The powder supply bin is equipped with an air inlet connector, which is connected to the lower chamber and the air supply mechanism respectively.

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