Aerosol graded sampling device capable of automatically replacing filter screen

Abstract

The invention provides an aerosol graded sampling device capable of automatically replacing a filter screen. The aerosol graded sampling device is used for solving the problem that the sampling efficiency of existing sampling equipment is reduced due to frequent replacement of the filter screen. The sampling device comprises a base, a filtering unit and a material changing unit, the filtering unit comprises a grading filter and a first shear fork mechanism, the grading filter comprises a plurality of filtering blocks, the filtering blocks are sequentially connected on the base in a stacked mode, the first shear fork mechanism comprises a plurality of first shear fork assemblies, and the first shear fork assemblies are sequentially and rotationally connected on the base in a stacked mode; each first shear fork assembly is connected with a filter block with the same height as the first shear fork assembly; and a rotating mechanism and a translation mechanism are installed at the bottom of the reloading unit, the reloading unit comprises a second shear fork mechanism and a multi-layer reloading plate, and the second shear fork mechanism comprises a plurality of layers of second shear fork assemblies which are rotationally connected in sequence. According to the sampling device, the filter screen can be rapidly replaced through the material changing unit, and the sampling efficiency is higher.

Description

Technical Field

[0001] The invention relates to an aerosol sampling device, in particular to an aerosol grading sampling device capable of automatically replacing a filter screen. Background Art

[0002] Aerosol is a stable dispersion system formed by solid or liquid particles suspended in air for a long time. Aerosol particles in the atmosphere have different particle sizes. It is usually necessary to collect aerosol particles of different sizes through a multi-stage sampler to conduct a classification study on aerosol particles of different sizes.

[0003] Existing aerosol graded sampling equipment is usually equipped with multiple layers of filters, each of which intercepts aerosol particles of corresponding particle sizes. However, after sampling is completed, this type of equipment requires manual replacement of the filter, and frequent replacement of the filter will lead to a significant reduction in sampling efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of existing sampling equipment such as reduced sampling efficiency due to frequent replacement of filter screens, and to provide an aerosol graded sampling device with automatic filter screen replacement.

[0005] In order to achieve the above objectives, the technical solutions provided by the present invention are as follows:

[0006] An aerosol graded sampling device capable of automatically replacing a filter screen, which is special in that it comprises a base, a filter unit and a material changing unit;

[0007] The filter unit comprises a graded filter, a first scissor mechanism and a first guide drive mechanism; the graded filter comprises a plurality of filter blocks stacked in sequence and interconnected on a base, and a filter screen is installed on each filter block except the top filter block; a top cover is provided on the top filter block, and an air inlet nozzle is provided on the top cover, and an air outlet nozzle is provided on the bottom filter block, and the air outlet nozzle is used to connect an air pump; the first guide drive mechanism is used to drive the first scissor mechanism to perform lifting and lowering movements;

[0008] The first scissor mechanism comprises a plurality of first scissor assemblies which are sequentially stacked and connected on the base, each first scissor assembly being connected to each filter block via a connecting plate; each first scissor assembly is foldable in height direction, and after being folded, each first scissor assembly is at the same height as the corresponding filter block;

[0009] The bottom of the material changing unit is provided with a rotating mechanism and a translation mechanism; the material changing unit, the rotating mechanism and the translation mechanism are installed in sequence from top to bottom, and the translation mechanism is installed on the base; the rotating mechanism is used to drive the material changing unit to rotate, and the translation mechanism is used to drive the material changing unit and the rotating mechanism to approach or move away from the grading filter;

[0010] The material changing unit includes a second scissors mechanism, a multi-layer material changing plate and a second guide drive mechanism; the second scissors mechanism includes a plurality of second scissors assemblies connected one-to-one with the multi-layer material changing plates; each second scissors assembly can be folded in the height direction; a plurality of second scissors assemblies are stacked in sequence on the base, so that a plurality of material changing plates are arranged at equal intervals in the height direction; the second guide drive mechanism is used to drive the second scissors mechanism to perform lifting and lowering movements; a plurality of open grooves are provided on the outer edge of the material changing plate for installing the filter screen that needs to be replaced; there is a material changing plate corresponding to each adjacent filter block.

[0011] Furthermore, the first guide drive mechanism includes a first drive device, a first fixed bracket and a first transmission mechanism; the first drive device is installed above the first scissor mechanism through the first fixed bracket;

[0012] The first transmission mechanism includes a first transmission screw, a first transmission nut and a first rotating seat; the first transmission screw is inserted into multiple first scissor-fork assemblies, one end of which is connected to the power output end of the first drive device, and the other end is rotatably connected to the first rotating seat; the first transmission nut is installed in the top-layer first scissor-fork assembly and is sleeved on the first transmission screw; the first rotating seat is located in the bottom-layer first scissor-fork assembly and is fixed on the base.

[0013] Furthermore, a support frame is installed on the base, the grading filter and the first scissor mechanism are both arranged on the base through the support frame, and the first rotating seat is fixed on the base through the support frame;

[0014] The first fixed bracket includes a first support platform and two first support plates; the two first support plates are respectively located on both sides of the first scissors mechanism, are parallel to each other, and are vertically installed on the support frame; the first support platform is horizontally installed on the top of the two first support plates, and the first drive device is fixed on the first support platform.

[0015] Furthermore, the second guide drive mechanism includes a second drive device, a second fixed bracket and a second transmission mechanism; the second drive device is installed above the second scissor mechanism through the second fixed bracket;

[0016] The second transmission mechanism includes a second transmission screw, a second transmission nut and a second rotating seat; the second transmission screw is inserted into the plurality of second scissor-fork assemblies, one end of which is connected to the power output end of the second drive device, and the other end is rotatably connected to the second rotating seat; the second transmission nut is installed in the second scissor-fork assembly on the top layer and is sleeved on the second transmission screw; the second rotating seat is located inside the second scissor-fork assembly on the bottom layer and is fixed on the output end of the rotating mechanism.

[0017] Furthermore, the second fixed bracket includes a second support platform and two second support plates; the two second support plates are parallel to each other and are vertically fixed on the output end of the rotating mechanism; the second support platform is horizontally fixed on the top of the two second support plates, and the second driving device is installed on the second support platform.

[0018] Further, the translation mechanism includes a fixed seat mounted on the base, and a driving motor, a screw rod and a slide seat respectively mounted on the fixed seat; one end of the screw rod is connected to the power output end of the driving motor; the slide seat is slidably mounted on the fixed seat and connected to a nut mounted on the screw rod;

[0019] The rotating mechanism includes a rotating motor and a rotating disk, and the rotating disk is the output end; the second scissors mechanism, the second rotating seat and the two second support plates are all installed on the rotating disk, and the rotating disk is movably installed on the slide; the rotating motor is installed on the slide, and the power output end of the rotating motor is connected to the rotating disk, which is used to drive the rotating disk to rotate on the slide.

[0020] Furthermore, it also includes two first guide rods and two second guide rods;

[0021] Two first guide rods are arranged in parallel, the tops of which are respectively connected to the first support platform, and the bottoms are installed on the support frame; two first guide holes are respectively arranged at corresponding positions on each connecting plate, and a first guide sleeve is installed in each first guide hole, and the two first guide rods pass through each connecting plate in turn and are sleeved in the corresponding first guide sleeve; the first transmission screw nut moves along the first transmission screw, thereby driving each first scissor assembly and the corresponding connecting plates and filter blocks to perform lifting activities in a direction parallel to the first guide rod;

[0022] Two second guide rods are arranged in parallel, and their tops are respectively connected to the second supporting platforms and their bottoms are installed on the rotating disk; two second guide holes are respectively opened at corresponding positions on each material changing plate, and a second guide sleeve is installed in each second guide hole. The two second guide rods pass through each material changing plate in turn and are sleeved in the corresponding second guide sleeve; the second transmission nut moves along the second transmission screw, thereby driving each second scissor assembly and the corresponding material changing plate to perform lifting and lowering activities along a direction parallel to the second guide rod.

[0023] Furthermore, it also includes a pressing device arranged above the grading filter, the pressing device includes a third driving device, a rotating block, a sliding block and a limit sensor;

[0024] A fixed plate is provided above the topmost connecting plate, and the first scissor assembly of the topmost layer extends upward and is connected to the fixed plate; the third driving device is installed on the fixed plate, and the power output end of the third driving device is connected to the rotating block; the rotating block is movably installed on the top cover of the topmost filter block, and a slide groove is provided on the rotating block; the slider is assembled in the slide groove, and the slider is connected to the top of the slide groove by a spring; the limit sensor is installed on the rotating block and is electrically connected to the third driving device, and is used to transmit a downward pressure signal to the third driving device.

[0025] Furthermore, it also includes a box body, the box body cover is arranged outside the filter unit and the material replacement unit and is connected to the base; the box body is provided with an air inlet for extending the air inlet nozzle of the graded filter.

[0026] Furthermore, a support seat is installed at the bottom of the base, and a buffer pad is installed at the bottom of the support seat.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1. The present invention comprises a base, a filter unit and a material changing unit. The filter unit comprises a graded filter, a first scissor mechanism and a first guide driving mechanism. The material changing unit comprises a second scissor mechanism, a multi-layer material changing plate and a second guide driving mechanism. Meanwhile, a rotating mechanism and a translation mechanism are arranged at the bottom of the material changing unit. When the graded filter is sampled and the filter screen inside each filter block needs to be replaced, the first guide driving mechanism drives the first scissor mechanism and the graded filter to rise so that each filter block is separated from each other, and then the second guide driving mechanism drives the second scissor mechanism and each material changing plate to rise so that one material changing plate corresponds to two adjacent filter blocks, the translation mechanism drives the material changing unit to approach the graded filter, and then the rotating mechanism drives each material changing plate to rotate so that the filter screen in the opening slot on the material changing plate enters between two adjacent filter blocks to replace the filter screen. The sampling device can realize rapid replacement of the filter screen through the material changing unit, and the sampling efficiency is higher.

[0029] 2. The first driving device of the present invention drives the first scissors mechanism and the corresponding filter block to rise and fall through the first transmission mechanism. At the same time, the second driving device drives the second scissors mechanism and the corresponding material changing plate to rise and fall through the second transmission mechanism. The screw and nut are matched to ensure the steady rise and fall of the filter block and the material changing plate, and the sampling efficiency is further improved.

[0030] 3. The design of the first guide rod and the second guide rod of the present invention further improves the stability of the lifting process of the filter block and the material changing plate, thereby achieving the accuracy of filter screen replacement.

[0031] 4. The present invention arranges the clamping device on the topmost filter block in the graded filter, so that the connection between the filter blocks is tighter, thereby ensuring the sampling quality of the graded filter; at the same time, when the rotating block drives the slider down to the set value of the limit sensor, the limit sensor will send a signal to the third drive device, so that the third drive device stops applying rotational force to the rotating block, thereby ensuring the stability of the graded filter.

[0032] 5. The present invention provides a box outside the filter unit and the material changing unit to protect the filter unit and the material changing unit from being disturbed by the external environment.

[0033] 6. The present invention has a support seat installed at the bottom of the base, and a buffer pad installed at the bottom of the support seat, thereby improving the shock resistance of the sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the external three-dimensional structure of an embodiment of the present invention.

[0035] Figure 2 The internal three-dimensional structure of the embodiment of the present invention is shown in FIG. Figure 1 .

[0036] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0037] Figure 4 The internal three-dimensional structure of the embodiment of the present invention is shown in FIG. Figure 2 .

[0038] Figure 5 It is a schematic diagram of the connection structure of the first scissor assembly, the connecting plate, the filter block and the first transmission nut in an embodiment of the present invention.

[0039] Figure 6 The schematic diagram of the connection structure between the second scissor assembly and the material exchange plate in the embodiment of the present invention is Figure 1 .

[0040] Figure 7 The schematic diagram of the connection structure between the second scissor assembly and the material exchange plate in the embodiment of the present invention is Figure 2 .

[0041] The reference numerals are as follows:

[0042] 100-base, 110-support frame, 120-first guide rod, 130-second guide rod, 140-support seat, 150-buffer pad, 200-filter unit, 210-graded filter, 211-filter block, 220-first scissor mechanism, 221-first scissor assembly, 222-connecting plate, 223-first guide hole, 224-first guide sleeve, 225-fixed plate, 230-first drive device, 240-first transmission mechanism, 241-first transmission screw, 242-first transmission screw nut, 243-first rotating seat, 250-first fixed bracket, 251-first support plate, 252-first support platform, 300-replacement unit, 310-second scissor mechanism, 311-first scissor assembly, 320 - material changing plate, 321 - opening groove, 322 - second guide hole, 323 - second guide sleeve, 330 - second driving device, 340 - second transmission mechanism, 341 - second transmission screw, 342 - second transmission nut, 343 - second rotating seat, 350 - second fixed bracket, 351 - second support plate, 352 - second supporting platform, 400 - rotating mechanism, 410 - rotating motor, 420 - rotating disk, 500 - translation mechanism, 510 - fixed seat, 520 - driving motor, 530 - screw rod, 540 - sliding seat, 600 - filter, 700 - clamping device, 701 - third driving device, 702 - rotating block, 703 - slider, 704 - limit sensor, 705 - slide groove, 706 - spring, 800 - box. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be clearly and completely described below in conjunction with specific embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work should belong to the protection scope of the present invention. In addition, the orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] Reference Figures 1 to 7 This embodiment provides an aerosol graded sampling device with automatically replaceable filters, including a base 100, a filter unit 200 and a material replacement unit 300.

[0045] Reference Figure 2 , Figure 4 , Figure 5 , the filter unit 200 includes a graded filter 210, a first scissor mechanism 220 and a first guide drive mechanism; the graded filter 210 includes a plurality of filter blocks 211, each of which is stacked and connected on the base 100, and each of the filter blocks 211 except the top filter block 211 is installed with a filter screen 600; wherein, a top cover is provided on the top filter block 211, and an air inlet nozzle is provided on the top cover for connecting the air inlet pipe for sampling, and generally the air inlet nozzle is opposite to the filter screen 600, so that the aerosol entering through the air inlet nozzle directly hits the filter screen 600. An air outlet nozzle is provided on the bottom filter block 211, and the air outlet nozzle is used to connect the air pump. The first guide drive mechanism is used to drive the first scissor mechanism 220 to do lifting and lowering motion. When the sampling device is working, the external gas enters the graded filter 210 from the air inlet nozzle, and each filter block 211 intercepts the aerosol particles in the external gas through the filter screen 600 inside it to achieve sampling.

[0046] The first scissors mechanism 220 includes a plurality of first scissors assemblies 221, each of which is rotatably connected in a stacked manner on the base 100, and each of the first scissors assemblies 221 is connected to each filter block 211 one by one through a connecting plate 222; each of the first scissors assemblies 221 is foldable in the height direction, and after being folded, is the same height as the corresponding filter block 211.

[0047] Specifically, a connecting plate 222 is provided between each first scissor assembly 221 and the filter block 211 of the corresponding height, and the connecting plate 222 connects the first scissor assembly 221 and the filter block 211. The connecting plate 222 is provided with a first avoidance hole, and the first scissor mechanism 220 is arranged in each first avoidance hole and is rotatably connected to the connecting plate 222 through a rotating shaft. In this way, the entire first scissor mechanism 220 is hidden inside each connecting plate 222 and connected to the connecting plate 222, so that the overall structure is more compact and the space utilization rate is higher.

[0048] A rotating mechanism 400 and a translation mechanism 500 are provided at the bottom of the material changing unit 300; the material changing unit 300, the rotating mechanism 400 and the translation mechanism 500 are installed in sequence from top to bottom, and the translation mechanism 500 is installed on the base 100; the rotating mechanism 400 is used to drive the material changing unit 300 to rotate, and the translation mechanism 500 is used to drive the material changing unit 300 and the rotating mechanism 400 to approach or move away from the grading filter 210.

[0049] Reference Figure 2 , Figure 4 , Figure 6 , Figure 7The material changing unit 300 includes a second scissor mechanism 310, a multi-layer material changing plate 320 and a second guide drive mechanism; the second scissor mechanism 310 includes a plurality of second scissor assemblies 311 connected one by one with the multi-layer material changing plates 320; each second scissor assembly 311 can be folded in the height direction; the plurality of second scissor assemblies 311 are sequentially stacked and rotatably connected on the base 100, so that the plurality of material changing plates 320 are arranged at equal intervals in the height direction; the second guide drive mechanism is used to drive the second scissor mechanism 310 to move up and down. A plurality of opening grooves 321 are provided on the outer edge of the material changing plate 320 for installing the filter screen 600 to be replaced; there is a corresponding material changing plate 320 between each of the two adjacent filter blocks 211.

[0050] In this embodiment, six opening slots 321 are provided at the outer edge of the material exchange plate 320, and the filter screen 600 is installed in the opening slots 321. In order to reduce the weight of the material exchange plate 320, a plurality of weight reduction slots are also provided at the outer edge of the material exchange plate 320, making the material exchange plate 320 more convenient to install.

[0051] When the filter screen 600 inside the filter block 211 needs to be replaced after sampling of each filter block 211, the first guide drive mechanism drives the first scissor mechanism 220 to rise, and at the same time drives the filter blocks 211 of the graded filter 210 to separate from each other, and then the second guide drive mechanism drives the second scissor mechanism 310 to rise, and at the same time drives each material change plate 320 to rise, so that there is a corresponding material change plate 320 between two adjacent filter blocks 211, and the translation mechanism 500 drives the material change unit 300 to approach the graded filter 210, and then the rotation mechanism 400 drives each material change plate 320 to rotate, so that the filter screen 600 in the open slot 321 on the material change plate 320 enters between two adjacent filter blocks 211 to replace the filter screen 600. This aerosol graded sampling device can realize the rapid replacement of the filter screen 600 through the material change unit 300, and the sampling efficiency is higher.

[0052] Reference Figure 2 and Figure 4 In some embodiments, the first guide driving mechanism includes a first driving device 230 , a first fixed bracket 250 and a first transmission mechanism 240 .

[0053] Specifically, the first driving device 230 is installed above the first scissor mechanism 220 through the first fixing bracket 250. The first transmission mechanism 240 includes a first transmission screw 241, a first transmission nut 242 and a first rotating seat 243; the first transmission screw 241 is arranged inside the plurality of first scissor assemblies 221, one end of which is connected to the power output end of the first driving device 230, and the other end is rotatably connected to the first rotating seat 243; the first transmission nut 242 is installed in the topmost first scissor assembly 221 and is sleeved on the first transmission screw 241; the first rotating seat 243 is located inside the bottommost first scissor assembly 221 and is fixed to the base 100.

[0054] Of course, the first transmission nut 242 can also be installed inside the first scissor assembly 221 at the top of the first scissor mechanism 220. Figure 5 As shown, the first transmission nut 242 is installed inside the first scissor assembly 221 between the topmost connecting plate 222 and the second topmost connecting plate 222 through a rotating shaft.

[0055] A supporting frame 110 is installed on the base 100 , the grading filter 210 and the first scissor mechanism 220 are both arranged on the base 100 through the supporting frame 110 , and the first rotating seat 243 is fixed on the base 100 through the supporting frame 110 .

[0056] The first fixed bracket 250 includes a first support platform 252 and two first support plates 251; the two first support plates 251 are respectively located on both sides of the first scissor mechanism 220, the two are parallel to each other, and are both vertically installed on the support frame 110. The first support platform 252 is horizontally installed on the top of the two first support plates 251, and the first driving device 230 is fixed in the middle of the first support platform 252.

[0057] A first transmission nut 242 is installed inside the first scissor assembly 221 at the top of the first scissor mechanism 220 through a rotating shaft, and a first rotating seat 243 is installed inside the first scissor assembly 221 at the bottom of the first scissor mechanism 220 through a rotating shaft, and the first rotating seat 243 is fixed on the supporting frame 110, and the first transmission screw 241 is rotatably connected to the first rotating seat 243 through a bearing, and the first driving device 230 drives the first transmission screw 241 to rotate and drive the first transmission nut 242, and the first scissor mechanism 220 is driven to rise through the first transmission nut 242 to separate the filter blocks 211 from each other, exposing the filter screen 600 inside the filter block 211, so that the material changing unit 300 replaces the old filter screen 600 with a new filter screen 600. After the replacement, the first driving device 230 drives the first transmission screw 241 to drive each filter block 211 to close.

[0058] In some embodiments, the second guide drive mechanism includes a second drive device 330 , a second fixed bracket 350 , and a second transmission mechanism 340 ; the second drive device 330 is installed above the second scissor mechanism 310 through the second fixed bracket 350 .

[0059] The second transmission mechanism 340 includes a second transmission screw 341, a second transmission nut 342, and a second rotating seat 343; the second transmission screw 341 is inserted into the plurality of second scissor assembly 311, one end of which is connected to the power output end of the second driving device 330, and the other end is rotatably connected to the second rotating seat 343. The second transmission nut 342 is installed in the second scissor assembly 311 at the top layer, and is sleeved on the second transmission screw 341; the second rotating seat 343 is located in the second scissor assembly 311 at the bottom layer, and is fixed to the output end of the rotating mechanism 400.

[0060] The second fixing bracket 350 includes a second supporting platform 352 and two second supporting plates 351; the two second supporting plates 351 are parallel to each other and are both vertically fixed on the output end of the rotating mechanism 400. The second supporting platform 352 is horizontally fixed on the top of the two second supporting plates 351, and the second driving device 330 is installed in the middle of the second supporting platform 352.

[0061] A second transmission nut 342 is installed inside the second scissor assembly 311 at the top of the second scissor mechanism 310 through a rotating shaft, and a second rotating seat 343 is installed inside the second scissor assembly 311 at the bottom of the second scissor mechanism 310 through a rotating shaft, and the second rotating seat 343 is fixed on the rotating mechanism 400, the second transmission screw 341 is threadedly connected with the second transmission nut 342, and the second transmission screw 341 is rotatably connected with the second rotating seat 343 through a bearing, and the second driving device 330 drives the second transmission screw 341 to rotate and drive the second transmission nut 342, and drives the second scissor mechanism 310 to rise through the second transmission nut 342 to separate the material changing plates 320 from each other, so that there is one material changing plate 320 corresponding to two adjacent filter blocks 211.

[0062] In some embodiments, the material exchange plate 320 is provided with a second avoidance hole, and the second scissor mechanism 310 is disposed in each second avoidance hole and is rotatably connected to the material exchange plate 320. In this way, the second scissor mechanism 310 is hidden inside each material exchange plate 320 and connected to the material exchange plate 320, and the overall structure is more compact and smaller in size.

[0063] In addition, two third avoidance holes are provided on the material exchange plate 320 , and the two second support plates 351 are respectively inserted into the two third avoidance holes, so that the arrangement of the second fixing bracket 350 and the material exchange plate 320 is more compact.

[0064] The translation mechanism 500 includes a fixed seat 510 mounted on the base 100, and a driving motor 520, a screw rod 530 and a slide 540 respectively mounted on the fixed seat 510. One end of the screw rod 530 is connected to the power output end of the driving motor 520; the slide 540 is slidably mounted on the fixed seat 510 and is matched with a nut mounted on the screw rod 530; the driving motor 520 drives the screw rod 530, and the screw rod 530 drives the slide 540 to slide horizontally, so as to realize that the material changing unit 300 is close to or away from the grading filter 210.

[0065] The rotating mechanism 400 includes a rotating motor 410 and a rotating disk 420, wherein the rotating disk 420 is the output end; the second scissors mechanism 310, the second rotating seat 343 and the two second support plates 351 are all installed on the rotating disk 420, and the rotating disk 420 is movably installed on the slide 540; the rotating motor 410 is installed on the slide 540, and the power output end of the rotating motor 410 is connected to the rotating disk 420, which is used to drive the rotating disk 420 to rotate on the slide 540.

[0066] In some embodiments, two first guide rods 120 and two second guide rods 130 are further included.

[0067] The two first guide rods 120 are arranged in parallel, and the tops thereof are connected to the first support platform 252 respectively, and the bottoms are installed on the support frame 110. Two first guide holes 223 for installing the first guide rods 120 are respectively arranged at corresponding positions on each connecting plate 222, and the two first guide holes 223 are respectively arranged on both sides of the first avoidance hole, and a first guide sleeve 224 is installed in each first guide hole 223. The two first guide rods 120 pass through each connecting plate 222 in turn, and are sleeved in the corresponding first guide sleeve 224, so that the connecting plate 222 can slide relative to the first guide rod 120. When the first transmission screw nut 242 moves along the first transmission screw 241, it can drive each first scissor assembly 221 and the corresponding connecting plate 222 and the filter block 211 to perform lifting activities in a direction parallel to the first guide rod 120, so that the opening and closing of each filter block 211 is more stable.

[0068] The two second guide rods 130 are arranged in parallel, and the tops thereof are fixedly connected to the second support platform 352, and the bottoms are vertically installed on the rotating disk 420. Two second guide holes 322 for installing the second guide rods 130 are respectively opened at corresponding positions on each material changing plate 320, and a second guide sleeve 323 is installed in each second guide hole 322. The two second guide rods 130 pass through each material changing plate 320 in turn and are sleeved in the corresponding second guide sleeve 323, so that the material changing plate 320 can slide up and down relative to the second guide rods 130. The second transmission screw nut 342 moves along the second transmission screw 341, thereby driving each second scissor assembly 311 and the corresponding material changing plate 320 to stably rise and fall in the direction parallel to the second guide rod 130.

[0069] Reference Figure 2 and Figure 3 In order to make the filter blocks 211 connected more tightly, in some embodiments, a clamping device 700 is provided above the graded filter 210 , and the clamping device 700 includes a third driving device 701 , a rotating block 702 , a slider 703 and a limit sensor 704 .

[0070] A fixed plate 225 is provided above the topmost connecting plate 222, and the topmost first scissor assembly 221 extends upward and is connected to the fixed plate 225; the third driving device 701 is installed on the fixed plate 225, and the power output end of the third driving device 701 is connected to the rotating block 702; the rotating block 702 is movably installed on the top cover of the topmost filter block 211, and a slide groove 705 is provided on the rotating block 702; the slider 703 is assembled in the slide groove 705, and the slider 703 is connected to the top of the slide groove 705 through a spring 706; the limit sensor 704 is installed on the rotating block 702, and is electrically connected to the third driving device 701, and is used to transmit a downward pressure signal to the third driving device 701. The third driving device 701 is used to drive the rotating block 702 to rotate, so that the slider 703 on the rotating block 702 is pressed against the top cover of the topmost filter block 211.

[0071] After the first scissor mechanism 220 drives each filter block 211 to press each other, the third driving device 701 drives the rotating block 702 to rotate, so that the slider 703 on the rotating block 702 is pressed against the top filter block 211, thereby pressing each filter block 211 more tightly, wherein the spring 706 plays a buffering role to prevent the slider 703 from over-pressing the filter block 211. The limit sensor 704 plays a role in sensing the downward pressure of the slider 703. When the rotating block 702 drives the slider 703 to press down to the set value of the limit sensor 704, the limit sensor 704 will send a signal to the third driving device 701, so that the third driving device 701 stops applying a rotational force to the rotating block 702.

[0072] Reference Figure 1 In some embodiments, the aerosol classification sampling device further includes a box 800, which is disposed outside the filter unit 200 and the material replacement unit 300 and connected to the base 100; the box 800 is provided with an air inlet, which is used to connect to the air inlet nozzle of the classification filter 210. The box 800 plays a role in protecting the filter unit 200 and the material replacement unit 300.

[0073] A support seat 140 is installed at the bottom of the base 100 , and a buffer pad 150 is installed at the bottom of the support seat 140 . The buffer pad 150 plays a buffering role.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit the present invention. Although the above embodiments have described the present invention in detail, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the present invention.

Claims

1. An aerosol graded sampling device capable of automatically replacing filters, characterized in that: It comprises a base (100), a filtering unit (200) and a material changing unit (300); The filtering unit (200) comprises a graded filter (210), a first scissor mechanism (220) and a first guide drive mechanism; the graded filter (210) comprises a plurality of filter blocks (211) stacked in sequence and interconnected on a base (100), and a filter screen (600) is installed on each filter block (211) except the top filter block (211); a top cover is provided on the top filter block (211), and an air inlet nozzle is provided on the top cover; an air outlet nozzle is provided on the bottom filter block (211), and the air outlet nozzle is used to connect an air pump; the first guide drive mechanism is used to drive the first scissor mechanism (220) to perform lifting and lowering movements; The first scissor mechanism (220) comprises a plurality of first scissor assemblies (221) which are sequentially connected in a stacked manner on the base (100); each first scissor assembly (221) is connected to each filter block (211) in a one-to-one correspondence via a connecting plate (222); each first scissor assembly (221) is foldable in a height direction and is the same height as the corresponding filter block (211) after being folded; A rotating mechanism (400) and a translation mechanism (500) are provided at the bottom of the material changing unit (300); the material changing unit (300), the rotating mechanism (400) and the translation mechanism (500) are installed in sequence from top to bottom, and the translation mechanism (500) is installed on the base (100); the rotating mechanism (400) is used to drive the material changing unit (300) to rotate, and the translation mechanism (500) is used to drive the material changing unit (300) and the rotating mechanism (400) to approach or move away from the grading filter (210); The material changing unit (300) comprises a second scissor mechanism (310), a multi-layer material changing plate (320) and a second guide drive mechanism; the second scissor mechanism (310) comprises a plurality of second scissor assemblies (311) connected to the multi-layer material changing plates (320) in a one-to-one correspondence; each second scissor assembly (311) is foldable in a height direction; the plurality of second scissor assemblies (311) are sequentially stacked and connected on the base (100), so that the plurality of material changing plates (320) are arranged at equal intervals in the height direction; the second guide drive mechanism is used to drive the second scissor mechanism (310) to perform lifting and lowering movements; a plurality of opening grooves (321) are provided on the outer edge of the material changing plate (320) for installing a filter screen (600) that needs to be replaced; and a material changing plate (320) corresponds to each of two adjacent filter blocks (211).

2. The aerosol graded sampling device with automatically replaceable filter screen according to claim 1 is characterized in that: The first guide drive mechanism comprises a first drive device (230), a first fixed bracket (250) and a first transmission mechanism (240); the first drive device (230) is installed above the first scissor mechanism (220) via the first fixed bracket (250); The first transmission mechanism (240) comprises a first transmission screw (241), a first transmission nut (242) and a first rotating seat (243); the first transmission screw (241) is inserted into the interior of the plurality of first scissor-fork assemblies (221), one end of which is connected to the power output end of the first driving device (230), and the other end is rotatably connected to the first rotating seat (243); the first transmission nut (242) is installed in the first scissor-fork assembly (221) at the top layer, and is sleeved on the first transmission screw (241); the first rotating seat (243) is located in the first scissor-fork assembly (221) at the bottom layer, and is fixed on the base (100).

3. The aerosol graded sampling device with automatically replaceable filter screen according to claim 2 is characterized in that: A support frame (110) is installed on the base (100); the grading filter (210) and the first scissor mechanism (220) are both arranged on the base (100) through the support frame (110); and the first rotating seat (243) is fixed on the base (100) through the support frame (110); The first fixed bracket (250) comprises a first support platform (252) and two first support plates (251); the two first support plates (251) are respectively located on both sides of the first scissor mechanism (220), are parallel to each other, and are both vertically mounted on the support frame (110); the first support platform (252) is horizontally mounted on the top of the two first support plates (251), and the first drive device (230) is fixed on the first support platform (252).

4. The aerosol graded sampling device with automatically replaceable filter screen according to claim 3 is characterized in that: The second guide drive mechanism comprises a second drive device (330), a second fixed bracket (350) and a second transmission mechanism (340); the second drive device (330) is installed above the second scissor mechanism (310) via the second fixed bracket (350); The second transmission mechanism (340) comprises a second transmission screw (341), a second transmission nut (342) and a second rotating seat (343); the second transmission screw (341) is inserted into the plurality of second scissor-fork assemblies (311), one end of which is connected to the power output end of the second driving device (330), and the other end is rotatably connected to the second rotating seat (343); the second transmission nut (342) is installed in the second scissor-fork assembly (311) at the top layer, and is sleeved on the second transmission screw (341); the second rotating seat (343) is located in the second scissor-fork assembly (311) at the bottom layer, and is fixed to the output end of the rotating mechanism (400).

5. The aerosol graded sampling device with automatically replaceable filter screen according to claim 4 is characterized in that: The second fixed bracket (350) comprises a second supporting platform (352) and two second supporting plates (351); the two second supporting plates (351) are parallel to each other and are both vertically fixed on the output end of the rotating mechanism (400); the second supporting platform (352) is horizontally fixed on the top of the two second supporting plates (351), and the second driving device (330) is installed on the second supporting platform (352).

6. The aerosol graded sampling device with automatically replaceable filter screen according to claim 5, characterized in that: The translation mechanism (500) comprises a fixed seat (510) mounted on the base (100), and a driving motor (520), a screw rod (530) and a sliding seat (540) respectively mounted on the fixed seat (510); one end of the screw rod (530) is connected to the power output end of the driving motor (520); the sliding seat (540) is slidably mounted on the fixed seat (510) and is connected to a nut mounted on the screw rod (530); The rotating mechanism (400) comprises a rotating motor (410) and a rotating disk (420), wherein the rotating disk (420) is an output end; the second scissor mechanism (310), the second rotating seat (343) and the two second supporting plates (351) are all mounted on the rotating disk (420), and the rotating disk (420) is movably mounted on a slide seat (540); the rotating motor (410) is mounted on the slide seat (540), and the power output end of the rotating motor (410) is connected to the rotating disk (420) for driving the rotating disk (420) to rotate on the slide seat (540).

7. The aerosol graded sampling device with automatically replaceable filter screen according to claim 6, characterized in that: It also includes two first guide rods (120) and two second guide rods (130); Two first guide rods (120) are arranged in parallel, and their tops are respectively connected to the first support platform (252), and their bottoms are installed on the support frame (110); two first guide holes (223) are respectively arranged at corresponding positions on each connecting plate (222), and a first guide sleeve (224) is installed in each first guide hole (223); the two first guide rods (120) pass through each connecting plate (222) in sequence and are sleeved in the corresponding first guide sleeve (224); the first transmission nut (242) moves along the first transmission screw (241), thereby driving each first scissor assembly (221) and the corresponding connecting plate (222) and the filter block (211) to perform lifting activities along a direction parallel to the first guide rods (120); The two second guide rods (130) are arranged in parallel, and the tops thereof are respectively connected to the second support platform (352), and the bottoms are installed on the rotating disk (420); two second guide holes (322) are respectively opened at corresponding positions on each material changing plate (320), and a second guide sleeve (323) is installed in each second guide hole (322); the two second guide rods (130) pass through each material changing plate (320) in turn, and are sleeved in the corresponding second guide sleeve (323); the second transmission nut (342) moves along the second transmission screw (341), thereby driving each second scissor assembly (311) and the corresponding material changing plate (320) to perform lifting activities along a direction parallel to the second guide rod (130).

8. The aerosol graded sampling device with automatically replaceable filter screen according to any one of claims 1 to 7, characterized in that: It also includes a pressing device (700) arranged above the grading filter (210), the pressing device (700) including a third driving device (701), a rotating block (702), a sliding block (703) and a limit sensor (704); A fixed plate (225) is provided above the topmost connecting plate (222), and the topmost first scissor assembly (221) extends upward and is connected to the fixed plate (225); the third driving device (701) is mounted on the fixed plate (225), and the power output end of the third driving device (701) is connected to the rotating block (702); the rotating block (702) is movably mounted on the top cover of the topmost filter block (211), and a slide groove (705) is provided on the rotating block (702); the slider (703) is assembled in the slide groove (705), and the slider (703) is connected to the top of the slide groove (705) through a spring (706); the limit sensor (704) is mounted on the rotating block (702), and is electrically connected to the third driving device (701), and is used to transmit a downward pressure signal to the third driving device (701).

9. The aerosol graded sampling device with automatically replaceable filter screen according to claim 1, characterized in that: It also includes a box body (800), which is arranged outside the filter unit (200) and the material replacement unit (300) and is connected to the base (100); the box body (800) is provided with an air inlet for extending the air inlet nozzle of the grading filter (210).

10. The aerosol graded sampling device with automatically replaceable filter screen according to claim 1, characterized in that: A support seat (140) is installed at the bottom of the base (100), and a buffer pad (150) is installed at the bottom of the support seat (140).

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