A public area air microbial sampling device

Abstract

The present invention provides a public area air microorganism sampling device, comprising a main unit and a culture dish. The main unit comprises a shell, an impact assembly and a base. The impact assembly is rotatably arranged on the shell. Several stacked culture dishes are arranged on the base. The shell is rotatably connected to the base. Each culture dish comprises a dish bottom and a dish cover. The dish cover is covered on the dish bottom. An agar layer is arranged in the dish bottom. The impact assembly has an open state and a closed state. In the open state, the space in the middle of the impact assembly is connected. In the closed state, the impact assembly separates the dish bottom and the dish cover of each culture dish. Multiple culture dishes are opened, and the culture dish covers are opened in the main unit, thereby reducing the contamination of the sampling results caused by placing the culture dishes with the covers opened before sampling. The culture dishes can also be recovered after the culture dish covers are covered after sampling, thereby reducing the sampling contamination during recovery.

Description

Technical Field

[0001] The present invention relates to the field of microbial sampling, in particular to a device for sampling air microorganisms in public areas. Background Art

[0002] Microbial sampling in public areas is a method for detecting air environmental indicators in public areas. The commonly used sampling device is a six-stage sieve hole impactor air microbial sampler. The six-stage sieve hole impactor air microbial sampler is composed of six impactors combined into one. Each stage is actually a single-stage sampler. Each single-stage sampler includes a disc with tiny holes and a culture dish with agar placed under the disc. Each disc has four hundred tiny holes arranged in a circle, which decrease layer by layer and have a standard sampling flow rate of 1 cubic foot (28.3L / min). The six single-stage samplers are firmly connected together by three spring hooks, and the gas is passed in from the sampling port on the top layer. Because the sizes of microbial particles in the air are different, the size and direction of the speed generated by the airflow are different. Microbial particles of different sizes impact the agar surface of the corresponding culture dish according to their aerodynamic characteristics.

[0003] In the sampling process of the existing technology, the lid of the culture dish with agar needs to be opened before it is placed in the sampling device. During this process, the agar in the sampling culture dish is always exposed to the air, and particles in the environment may directly adhere to the culture medium. At the same time, the operator needs to hold his breath during the placement and recovery process to reduce the impact of exhaled gas on the sampling results. However, operational risks and environmental maintenance risks may cause false positives or false negatives in the sampling results, which may still affect the sampling results.

[0004] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] In view of the deficiencies of the existing technology, a public area air microorganism sampling device is provided, which can greatly reduce the impact of the operation process and environment on the sampling results and reduce sampling errors.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A public area air microorganism sampling device, comprising:

[0008] The host comprises a shell, a base and a plurality of impact assemblies, the shell having openings at both ends, a detachable cover being provided at one end of the shell, and the other end of the shell being detachably connected to the base, the plurality of impact assemblies being equidistantly arranged in the shell along the vertical direction, each of the impact assemblies comprising a base plate and a plurality of porous plates, the base plate having a through hole in the middle thereof, the porous plates comprising a plurality of unit plates rotatably connected to the base plate, each of the unit plates being provided with a plurality of holes;

[0009] A plurality of culture dishes, each comprising a dish bottom and a dish cover, the dish cover being covered on the dish bottom, an agar layer being provided in the dish bottom, the plurality of stacked culture dishes being placed on the base and positioned in the through-holes of the substrate, each of the impact assemblies corresponding to each of the culture dishes;

[0010] The impact assembly has an open state and a closed state. When the impact assembly is in the open state, the unit plate is retracted, the through-holes on the base plate are opened, and a plurality of unopened culture dishes are stacked in sequence. When the impact assembly is in the closed state, the unit plates are extended and gathered at the center of the base plate to form a closed plate body. The multi-porous plate covers the through-holes in the middle of the base plate. The multi-porous plate separates the bottom and the cover of each culture dish, and a plurality of culture dishes are opened.

[0011] The main unit further comprises a plurality of seals, wherein the plurality of seals are arranged on the impact assembly, and the seal closest to the upper end of the shell is connected to the shell;

[0012] An air pump, wherein the working end of the air pump is connected to the base, and is used for pumping air so that the air flows from the upper end of the shell to the end of the shell connected to the base during sampling.

[0013] Optionally, the impact assembly further includes a rotating plate and a plurality of connecting rods, a plurality of slide grooves are uniformly arranged along the circumference of the rotating plate, the slide grooves are arc-shaped, the slide grooves are concentric with the rotating plate, a plurality of cylindrical pins are uniformly arranged along the circumference of the base plate, each of the cylindrical pins corresponds to each of the slide grooves one by one and the cylindrical pins are slidably arranged in the slide grooves, the rotating plate is located above the base plate, and the sealing member is fixedly arranged on the rotating plate;

[0014] The connecting rod corresponds to the unit plate one by one, one end of the connecting rod is rotatably connected to the unit plate, and the other end of the connecting rod is rotatably connected to the rotating plate. The end of the unit plate hinged to the base plate is close to the through hole of the base plate, and the end of the unit plate hinged to the connecting rod rotates around the hinge point between the unit plate and the base plate.

[0015] Optionally, the unit plate includes a first plate body and a boss, the first plate body is provided with a plurality of holes, and the surface of the boss close to the first plate body is an inclined surface.

[0016] Optionally, the shell and the base are cylindrical structures, the shell and the base are coaxially arranged, the multiple substrates are eccentrically arranged with respect to the shell, the shell is rotatably connected to the base, and the sealing member closest to the upper end of the shell is rotatably connected to the shell;

[0017] Transmission teeth 1 corresponding to the positions of the plurality of rotating plates are arranged on the inner side wall of the shell, and transmission teeth 2 are arranged on the arc surface of the outer side surface of the rotating plate. The plurality of transmission teeth 1 are staggered in the circumferential direction in sequence.

[0018] Optionally, a limit platform is provided on the upper end surface of the boss, and one end of the limit platform close to the boss inclined surface is an inclined surface.

[0019] Optionally, magnets are respectively provided inside the bottom of the culture dish and the opening of the lid.

[0020] Optionally, outer side surfaces of the opening ends of the dish bottom and the dish cover are chamfered.

[0021] Optionally, positioning pins are provided on the upper portion of the base, and the positioning pins are evenly distributed along a circumference coaxial with the base plate, and the culture dish is provided on the positioning pins.

[0022] Optionally, a vent is provided in the middle of the base, the vent is coaxial with the substrate, one end of the vent is connected to a side of the base where the culture dish is provided, the other end of the vent is connected to the side wall of the base, the output end of the air pump is connected to a vent pipe, and the other end of the vent pipe connected to the air pump is connected to one end of the vent connected to the side wall of the base.

[0023] Optionally, the public area air microorganism sampling device further includes a flow meter for calculating the sampling flow.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention provides a covered culture dish and an impact assembly. An openable and closable porous plate is provided in the impact assembly. The culture dish cover is opened in the host, thereby reducing the contamination of the sampling results caused by placing the open culture dish before sampling. The culture dish cover can also be covered after sampling and then recovered, thereby reducing sampling contamination during recovery.

[0026] 2. The present invention is provided with a transmission tooth 1 on the housing and a transmission tooth 2 on the rotating plate. When sampling, multiple culture dishes can be placed at the same time. By rotating the housing, all culture dishes can be opened for sampling. By rotating the housing in the opposite direction, all sampled culture dishes can be covered. There is no need to place and cover them one by one, and the operation is convenient, fast and not cumbersome. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a public area air microorganism sampling device according to the present invention;

[0028] Figure 2 This is an exploded schematic diagram of the structure of a public area air microorganism sampling device according to the present invention;

[0029] Figure 3 It is a structural diagram of the host in the present invention;

[0030] Figure 4 for Figure 3 Cross-sectional view at AA in the middle (initial state with culture dish);

[0031] Figure 5 for Figure 3 Another cross-sectional view at AA in the middle (sampling state with culture dish);

[0032] Figure 6 for Figure 3 Cross-sectional view at AA in the middle (omitting the initial state of the culture dish);

[0033] Figure 7 for Figure 3 Cross-sectional view at AA in the middle (omitting the sampling state of the culture dish);

[0034] Figure 8 for Figure 3 Cross-sectional view at the middle BB;

[0035] Figure 9 A schematic diagram of the structure of the culture dish in the open state of the present invention (seal is omitted);

[0036] Figure 10 This is a schematic structural diagram of the culture dish in the closed state of the present invention;

[0037] Figure 11 for Figure 3 Another cross-sectional view of the middle AA (only one set of culture dishes);

[0038] Figure 12 Schematic diagram of the structure of the culture dish of the present invention;

[0039] Figure 13 for Figure 12 Cross-sectional view at CC.

[0040] in:

[0041] 100, host; 110, housing; 120, seal; 130, base; 140, impact assembly; 150, porous plate; 160, rotating plate; 170, base plate; 180, unit plate; 190, connecting rod; 111, cover; 112, transmission gear 1; 131, positioning pin; 132, vent; 181, first plate; 182, boss; 183, limiter; 161, first rotating plate; 162, second rotating plate; 163, third rotating plate; 164, fourth rotating plate; 165, fifth rotating plate; 166, sixth rotating plate; 167, transmission gear 2; 1121, first transmission gear 1; 1122, second transmission gear 1; 1123, third transmission gear 1; 1124, fourth transmission gear 1; 1125, fifth transmission gear 1; 1126, sixth transmission gear 1;

[0042] 200, culture dish; 210, dish bottom; 220, dish cover; 230, magnet; 240, chamfer; 201, first culture dish; 202, second culture dish; 203, third culture dish; 204, fourth culture dish; 205, fifth culture dish; 206, sixth culture dish;

[0043] 300, chassis; 310, ventilation pipe. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0046] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] Please refer to Figures 1 to 13 The present invention provides a public area air microorganism sampling device, which includes a main unit 100, a culture dish 200 and a chassis 300. A plurality of culture dishes 200 stacked in a vertical direction are arranged in the main unit 100, and the main unit 100 is connected to the chassis 300 for air extraction and sampling.

[0048] The main unit 100 includes a housing 110, a sealing member 120, a base 130, and several impact assemblies 140. The impact assemblies 140 are disposed within the housing 110. The housing 110 is detachably mounted on the base 130, and the stacked culture dishes 200 are mounted on the base 130. Both ends of the housing 110 are open, and a detachable cover 111 is disposed at one end of the housing 110. The cover 111 is removed during sampling to allow ambient sample air to enter the housing 110.

[0049] Several impact assemblies 140 are equidistantly arranged in the vertical direction. Each impact assembly 140 includes a base plate 170 and a porous plate 150. The base plate 170 is provided with a through hole in the middle. Each porous plate 150 is composed of a plurality of unit plates 180 rotatably connected to the base plate 170. Each unit plate 180 is provided with a plurality of tiny holes.

[0050] The culture dish 200 includes a dish bottom 210 and a dish cover 220. The diameter of the dish bottom 210 is the same as the diameter of the dish cover 220. The dish cover 220 covers the dish bottom 210. An agar layer is provided in the dish bottom 210 for collecting microbial particles. The diameter of the through hole in the middle of the substrate 170 is the same as the diameter of the culture dish 200. Several stacked culture dishes 200 are arranged in the through holes in the middle of several substrates 170. Each impact assembly 140 corresponds to each culture dish 200.

[0051] The impact assembly 140 has an open state and a closed state. When the impact assembly 140 is in the open state, all the porous plates 150 are retracted, the central space of the impact assembly 140 is through, and multiple culture dishes 200 are stacked in sequence and placed in the space in the middle of the impact assembly 140, and are in an unopened state; when the impact assembly 140 is closed, the porous plates 150 are unfolded, the porous plates 150 cover the through holes in the middle of the substrate 170, and the porous plates 150 separate the bottom 210 and the cover 220 of each corresponding culture dish 200, and multiple culture dishes 200 are opened.

[0052] The seal 120 is an annular structure and is disposed on the impact assembly 140 to prevent the sampled air from flowing into the lower end of the housing 110 from between the impact assembly 140 and the inner wall surface of the housing 110 .

[0053] It should be added that the chassis 300 includes an air pump, the output end of the air pump is connected to the base 130, and there is an air vent 132 in the middle of the base 130. During sampling, the cover 111 is opened, and the air pump is used to pump air, so that the air in the area to be sampled enters the shell 110, and the air flow direction is from one end of the shell 110 where the cover 111 is set to the end of the shell 110 connected to the base 130, so that the sampled air flows through several culture dishes 200 in the open state in turn. The sampled air enters through the upper end of the shell 110, and after hitting the agar culture medium of the culture dish 200 from the top porous plate 150, it enters the space where the next porous plate 150 is located through the gap between the porous plate 150 and the culture dish 200, and then enters from the next porous plate 150 and hits the agar culture medium of the next culture dish 200. The sampled air passes through multiple porous plates 150 in turn.

[0054] In a further embodiment, the impact assembly 140 further includes a rotating plate 160 and a plurality of connecting rods 190. The rotating plate 160 is an annular structure. A plurality of slide grooves are uniformly distributed along the circumference of the rotating plate 160. A plurality of cylindrical pins are uniformly distributed along the circumference of the rotating plate 160. Each cylindrical pin corresponds to each slide groove one by one and the cylindrical pins slide in the slide groove. The rotating plate 160 is rotatably disposed on the base plate 170, and the sealing member 120 is fixedly disposed on the rotating plate 160.

[0055] The connecting rod 190 corresponds to the unit plate 180 one by one, one end of the connecting rod 190 is rotatably connected to the unit plate 180 through a pin hole connection, and the other end of the connecting rod 190 is rotatably connected to the rotating plate 160 through a pin hole connection; the end of the unit plate 180 hinged to the base plate 170 is close to the through hole of the base plate 170, and the end of the unit plate 180 hinged to the connecting rod 190 rotates around the hinge point between the unit plate 180 and the base plate 170.

[0056] The rotating plate 160 is rotated in one direction, and the plurality of unit plates 180 spread in the circumferential direction of the base plate 170 to form a space in the middle of the impact assembly 140 that can allow the culture dish 200 to pass through. Figure 9 , rotating the rotating plate 160 in the opposite direction, the multiple unit plates 180 gather toward the center of the base plate 170 to form a closed porous plate 150, covering the through hole in the middle of the base plate 170, please refer to Figure 10 .

[0057] During use, this embodiment takes six culture dishes 200 and six impact assemblies 140 as an example. During use, the culture dishes 200 are defined as the first culture dish 201, the second culture dish 202, the third culture dish 203, the fourth culture dish 204, the fifth culture dish 205, and the sixth culture dish 206 from bottom to top, and the rotating plates 160 are defined as the first rotating plate 161, the second rotating plate 162, the third rotating plate 163, the fourth rotating plate 164, the fifth rotating plate 165, and the sixth rotating plate 166. Before sampling, the initial state of the impact assembly 140 is that the multiple unit plates 180 are not gathered together, and there is a through space in the middle of the impact assembly 140.

[0058] The stacked culture dishes 200 are placed in the middle space of the impact assembly 140, and the first rotating plate 161 is rotated. The multiple unit plates 180 connected thereto gather toward the center of the circle. The unit plates 180 gather toward the center of the circle from the connection between the bottom 210 and the cover 220 of the first culture dish 201. The cover 220 is lifted a certain distance from the bottom 210. At this time, the first culture dish 201 is opened, and the cover 220 of the first culture dish 201 and the other unopened culture dishes 200 placed thereon are lifted the same distance. When the second culture dish 202 is rotated, the connection between the dish bottom 210 and the dish cover 220 corresponds to the position of the unit plate 180 connected to the second rotating plate 162, and the bottom surface of this unit plate 180 is higher than the connection between the dish bottom 210 and the dish cover 220 of the second culture dish 202, so that the sampled gas can flow from the space between this unit plate 180 and the dish bottom 210 of the second culture dish 202 into the space where the next unit plate 180 is located; when the second rotating plate 162 is rotated, the multiple unit plates 180 connected thereto gather toward the center of the circle, and the second culture dish 202 is rotated. The lid 220 of the second culture dish 202 is lifted a certain distance from the bottom 210 of the dish. At this time, the second culture dish 202 is opened, and the lid 220 of the second culture dish 202 and the other unopened culture dishes 200 placed thereon are lifted the same distance. At this time, the connection between the bottom 210 and the lid 220 of the third culture dish 203 corresponds to the position of the unit plate 180 connected to the third rotating plate 163, and the bottom surface of the unit plate 180 is higher than the connection between the bottom 210 and the lid 220 of the third culture dish 203. The purpose is to enable the sampling gas to The liquid flows from the space between this unit plate 180 and the bottom 210 of the third culture dish 203 into the space where the next unit plate 180 is located; the third rotating plate 163 is rotated to open the third culture dish 203; the fourth rotating plate 164 is rotated to open the fourth culture dish 204; the fifth rotating plate 165 is rotated to open the fifth culture dish 205; the sixth rotating plate 166 is rotated to open the sixth culture dish 206, and the rotating plates 160 of each layer are rotated from bottom to top. The culture dishes 200 from bottom to top are opened in turn, and the air pump can be turned on to start sampling;

[0059] After sampling, the sixth rotating plate 166 is rotated in the reverse direction, and the multiple unit plates 180 connected thereto are spread in the circumferential direction of the base plate 170. The dish cover 220 of the sixth culture dish 206 is lowered a certain distance and covered back on the dish bottom 210, and the sixth culture dish 206 is covered. The fifth rotating plate 165 is rotated in the reverse direction, and the multiple unit plates 180 connected thereto are spread in the circumferential direction of the base plate 170. The dish cover 220 of the fifth culture dish 205 is lowered a certain distance and covered back on the dish bottom 210, and the fifth culture dish 205 is covered, contacting it. The sixth culture dish 206 then falls a certain distance; the fourth rotating plate 164 is rotated in the opposite direction to cover the fourth culture dish 204; the third rotating plate 163 is rotated in the opposite direction to cover the third culture dish 203; the second rotating plate 162 is rotated in the opposite direction to cover the second culture dish 202; the first rotating plate 161 is rotated in the opposite direction to cover the first culture dish 201; the rotating plates 160 are rotated in the opposite direction from top to bottom, and the culture dishes 200 from top to bottom are covered in sequence to the initial stacked state, and the sampled culture dishes 200 are recovered.

[0060] In a further embodiment, the unit plate 180 includes a first plate body 181 and a boss 182. The first plate body 181 is arranged on a side close to the center of the substrate 170. A plurality of holes are provided on the first plate body 181. The boss 182 is arranged on a side away from the center of the substrate 170. The upper end of the boss 182 is a plane, and the end of the boss 182 close to the first plate body 181 is a slope. When the unit plate 180 connected to the impact assembly 140 converges toward the center of the substrate 170, the dish cover 220 in the culture dish 200 corresponding to the impact assembly 140 is first lifted by the first plate body 181 and then contacts the slope of the boss 182. After being lifted by the slope, it is located on the plane of the upper end of the boss 182.

[0061] In a further embodiment, the housing 110 and the base 130 are cylindrical structures, the housing 110 and the base 130 are coaxially arranged, the multiple substrates 170 are eccentrically arranged with respect to the housing 110, and the culture dish 200 is eccentrically arranged with respect to the base 130, and the housing 110 and the base 130 are rotatably connected;

[0062] Each seal 120 corresponds to each impact assembly 140 one by one, a sliding member is provided at one end of the opening of the seal 120, and an annular groove coaxial with the base plate 170 is provided at the bottom of the base plate 170. The sliding member slides in the annular groove of the base plate 170 of the impact assembly 140 located thereon, and the seal 120 is rotatably connected to the impact assembly 140 above it; an annular groove is eccentrically provided on the upper part of the inner wall of the shell 110 and the shell 110, and the sliding member on the seal 120 at the upper end slides in the annular groove of the shell 110, and the seal 120 at the upper end is rotatably connected to the shell 110. The air during sampling can only flow into the opened culture dish 200 through the porous plate 150.

[0063] A plurality of transmission teeth 112 are provided on the inner side wall of the housing 110 and correspond one to one with the positions of the rotating plate 160. A second transmission tooth 167 is provided on the arc surface of the outer side of the rotating plate 160. The plurality of transmission teeth 112 are staggered in the circumferential direction.

[0064] From bottom to top, multiple transmission teeth 112 are defined as the first transmission tooth 1121, the second transmission tooth 1122, the third transmission tooth 1123, the fourth transmission tooth 1124, the fifth transmission tooth 1125 and the sixth transmission tooth 1126. The initial position of all rotating plates 160 is that the transmission tooth 2 167 thereon is at the shortest distance between the impact assembly 140 and the inner wall of the shell 110. The housing 110 is rotated, and the first transmission tooth 1121 is engaged with the second transmission tooth 167 on the first rotating plate 161. When the first transmission tooth 1121 rotates to the shortest distance, the first transmission tooth 1121 drives the first rotating plate 161 to rotate and then disengages; then the second transmission tooth 1122 is engaged with the second transmission tooth 167 on the second rotating plate 162. At the shortest distance between the impact assembly 140 and the inner wall of the housing 110, the second transmission tooth 1122 drives the second rotating plate 162 to rotate and then disengages; then the third transmission tooth 1123 is engaged with the transmission tooth 167 on the third rotating plate 163. The second transmission tooth 167 engages and then disengages; the fourth transmission tooth 1124 engages and then disengages with the second transmission tooth 167 on the fourth rotating plate 164; the fifth transmission tooth 1125 engages and then disengages with the second transmission tooth 167 on the fifth rotating plate 165; the sixth transmission tooth 1126 engages and then disengages with the second transmission tooth 167 on the sixth rotating plate 166; and all the transmission teeth 112 are sequentially engaged with the corresponding second transmission tooth 167 and then disengaged... Then, the housing 110 is rotated, that is, the first rotating plate 161 to the sixth rotating plate 166 are rotated in sequence, and the first culture dish 201 to the sixth culture dish 206 are opened in sequence.

[0065] When the culture dish 200 is recovered after sampling, the housing 110 is rotated in the reverse direction, the sixth transmission tooth 1126 engages with the second transmission tooth 167 on the sixth rotating plate 166 and then disengages, and the sixth rotating plate 166 rotates in the reverse direction, so that the unit plate 180 connected thereto spreads in the circumferential direction of the base plate 170, and the dish cover 220 of the sixth culture dish 206 falls onto the dish bottom 210, and the sixth culture dish 206 is covered; then the fifth transmission tooth 1125 engages with the second transmission tooth 167 on the fifth rotating plate 165 and then disengages, the fifth rotating plate 165 rotates in the reverse direction, and the fifth culture dish 205 is covered; then the fourth rotating plate 164 to the first rotating plate 161 rotate in the reverse direction in sequence, and the fourth culture dish 204 to the first culture dish 201 are covered in sequence.

[0066] In a further embodiment, a limit platform 183 is provided on the upper end plane of the boss 182, the end of the limit platform 183 close to the inclined surface of the boss 182 is an inclined surface, and an arc-shaped protrusion is provided on the end of the limit platform 183 away from the inclined surface of the boss 182. The dish cover 220 of the culture dish 200 is lifted onto the limit platform 183, making it easier for the sampled air to enter the dish bottom 210, and the arc-shaped protrusion prevents the dish cover 220 from falling.

[0067] In further embodiments, please refer to Figure 12 and Figure 13 , magnets 230 that can be attracted are respectively provided inside the openings of the dish bottom 210 and the dish cover 220, which facilitate the covering of the dish bottom 210 and the dish cover 220 and prevent the dish cover 220 from sliding on the dish bottom 210 at will, thereby increasing the stability of the covering.

[0068] In a further embodiment, chamfers 240 are provided on the outer sides of the opening ends of the dish bottom 210 and the dish cover 220 to reduce the influence of the position error of the unit plate 180 on the opening of the dish cover 220 when the unit plate 180 converges toward the center of the base plate 170.

[0069] In a further embodiment, positioning pins 131 coaxial with the base plate 170 and evenly distributed along the circumference are provided on the upper portion of the base 130 , and the culture dish 200 is placed on the positioning pins 131 .

[0070] In a further embodiment, a vent hole 132 is coaxially arranged in the middle of the base 130 and the substrate 170, one end of the vent hole 132 is connected to a side of the base 130 where the culture dish 200 is set, and the other end of the vent hole 132 is connected to the side wall of the base 130, the output end of the air pump is connected to the vent tube 310, and the other end of the vent tube 310 connected to the air pump is connected to one end of the side wall of the base 130 connected to the vent hole 132.

[0071] In a further embodiment, the chassis 300 further includes a flow meter for calculating the sampling flow.

[0072] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that a person of ordinary skill in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be determined by the appended claims.

Claims

1. A public area air microbial sampling device, characterized in that: include: The main unit includes a shell, a base and a plurality of impact assemblies. The shell has openings at both ends, a cover is detachably provided at one end of the shell, and the other end of the shell is detachably connected to the base. The plurality of impact assemblies are equidistantly arranged in the shell along the vertical direction. Each impact assembly includes a base plate and a plurality of porous plates. The base plate has a through hole in the middle. The porous plates include a plurality of unit plates rotatably connected to the base plate. The unit plates include a first plate body and a boss. The first plate body is provided on a side close to the center of the base plate. A plurality of holes are provided on the first plate body. The boss is provided on a side away from the center of the base plate. The upper end of the boss is a plane, and the end of the boss close to the first plate body is an inclined surface. A plurality of culture dishes, each comprising a dish bottom and a dish cover, the dish cover covering the dish bottom, an agar layer disposed within the dish bottom, the plurality of stacked dish dishes being placed on a base and positioned within the through-holes of a base plate, each impact assembly corresponding to each dish, the dish bottom and the dish cover having the same diameter, and chamfered outer surfaces of the open ends of the dish bottom and the dish cover to reduce the effect of positional errors of the unit plates on the opening of the dish cover when the unit plates converge toward the center of the base plate; The impact assembly has an open state and a closed state. When the impact assembly is in the open state, the unit plate retracts, the through-hole on the base plate is opened, and multiple unopened culture dishes are stacked in sequence. When the impact assembly is in the closed state, when the unit plates connected to the impact assembly gather toward the center of the base plate, the dish cover in the culture dish corresponding to the impact assembly is first lifted by the first plate body and then contacts the inclined surface of the boss. After being lifted by the inclined surface, it is located on the plane at the upper end of the boss. The unit plates extend and gather at the center of the base plate to form a closed plate body. The multi-porous plate covers the through-hole in the middle of the base plate. The multi-porous plate separates the dish bottom and dish cover of each culture dish, and multiple culture dishes are opened. The main unit further comprises a plurality of seals, wherein the plurality of seals are arranged on the impact assembly, and the seal closest to the upper end of the shell is connected to the shell; An air pump, the working end of which is connected to the base, for pumping air so that the air flows from the upper end of the housing to the end of the housing connected to the base during sampling; The impact assembly further includes a rotating plate and a plurality of connecting rods, wherein a plurality of slide grooves are evenly distributed along the circumference of the rotating plate, the slide grooves are arc-shaped, and the slide grooves are concentric with the rotating plate, and a plurality of cylindrical pins are evenly distributed along the circumference of the rotating plate are provided on the base plate, each of the cylindrical pins corresponds to each of the slide grooves one by one and the cylindrical pins are slidably arranged in the slide grooves, the rotating plate is located above the base plate, and the sealing member is fixedly arranged on the rotating plate; The connecting rod corresponds to the unit plate one by one, one end of the connecting rod is rotatably connected to the unit plate, and the other end of the connecting rod is rotatably connected to the rotating plate. The end of the unit plate hinged to the base plate is close to the through hole of the base plate, and the end of the unit plate hinged to the connecting rod rotates around the hinge point between the unit plate and the base plate; a limit platform is provided on the upper end surface of the boss, and the end of the limit platform close to the inclined surface of the boss is an inclined surface.

2. The public area air microorganism sampling device according to claim 1, characterized in that: The shell and the base are cylindrical structures, the shell and the base are coaxially arranged, the multiple substrates are eccentrically arranged with respect to the shell, the shell is rotatably connected to the base, and the sealing member closest to the upper end of the shell is rotatably connected to the shell; Transmission teeth 1 corresponding to the positions of the plurality of rotating plates are arranged on the inner side wall of the shell, and transmission teeth 2 are arranged on the arc surface of the outer side surface of the rotating plate. The plurality of transmission teeth 1 are staggered in the circumferential direction in sequence.

3. The public area air microorganism sampling device according to claim 1, characterized in that: Magnets are respectively arranged inside the bottom of the culture dish and the opening of the dish cover.

4. The public area air microorganism sampling device according to claim 1, characterized in that: Positioning pins are arranged on the upper part of the base. The positioning pins are evenly distributed along a circumference coaxial with the base plate. The culture dish is arranged on the positioning pins.

5. The public area air microorganism sampling device according to claim 1, characterized in that: An air vent is provided in the middle of the base, the air vent is coaxial with the substrate, one end of the air vent is connected to a side of the base on which the culture dish is provided, the other end of the air vent is connected to the side wall of the base, the output end of the air pump is connected to the air pipe, and the other end of the air pipe connected to the air pump is connected to one end of the air hole connected to the side wall of the base.

6. The public area air microorganism sampling device according to claim 1, characterized in that: The public area air microorganism sampling device also includes a flow meter for calculating the sampling flow.

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