Public area air microorganism sampling device

Abstract

The invention provides a public area air microorganism sampling device, which comprises a main machine and culture dishes, the main machine comprises a shell, an impact assembly and a base, the impact assembly is rotatably arranged on the shell, a plurality of piled culture dishes are arranged on the base, the shell is rotatably connected with the base, each culture dish comprises a dish bottom and a dish cover, the dish cover covers the dish bottom, and the dish cover covers the dish bottom. An agar layer is arranged in the dish bottom; the impact assembly has an open state and a closed state, the space in the middle of the impact assembly is through in the open state, and the impact assembly separates the dish bottom and the dish cover of each culture dish, opens the plurality of culture dishes and opens the culture dish cover in the main machine in the closed state, so that the pollution possibly caused to a sampling result by placing the culture dish with the cover opened before sampling is reduced; and the culture dish can be recycled after the culture dish cover is covered after sampling, so that sampling pollution during recycling is reduced.

Description

Technical Field

[0001] The invention relates to the field of microbial sampling, and in particular to a public area air microbial sampling device. 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 impact air microbial sampler. The six-stage sieve hole impact 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 ring, which decrease layer by layer, and the standard sampling flow rate is 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 prior art, the lid of the culture dish with agar needs to be opened and then 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 in the prior art, 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 the sampling error.

[0006] The above purpose is achieved through the following technical solutions: A public area air microorganism sampling device, comprising: A host, the host comprising a shell, a base and a plurality of impact assemblies, the shell having openings at both ends, a cover being detachably provided at one end of the shell, and the other end of the shell being detachably connected to the base, a plurality of the impact assemblies being equidistantly provided in the shell along a vertical direction, each of the impact assemblies comprising a base plate and a plurality of porous plates, a through hole being provided in the middle of the base plate, the porous plates comprising a plurality of unit plates rotatably connected to the base plate, and a plurality of holes being provided on each of the unit plates; A plurality of culture dishes, each of which comprises a dish bottom and a dish cover, wherein the dish cover is covered on the dish bottom, an agar layer is arranged in the dish bottom, a plurality of stacked culture dishes are placed on the base and located in the through hole of the substrate, and each of the impact assemblies corresponds to each of the culture dishes one by one; 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 hole on the base plate is opened, and a plurality of unopened culture dishes are stacked in sequence; when the impact assembly is in the closed state, the unit plate is extended and gathered at the center of the base plate to form a closed plate body, the multi-hole plate covers the through hole in the middle of the base plate, the multi-hole plate separates the dish bottom and the dish cover of each of the culture dishes, and a plurality of the culture dishes are opened; The host 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, 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.

[0007] Optionally, the impact assembly further comprises a rotating plate and a plurality of connecting rods, a plurality of slide grooves are evenly arranged on the rotating plate in the circumferential direction, the slide grooves are arc-shaped, the slide grooves are concentric with the rotating plate, a plurality of cylindrical pins evenly arranged in the circumferential direction are arranged 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.

[0008] Optionally, the unit plate includes a first plate body and a boss, the first plate body is provided with a plurality of holes, and a surface of the boss close to the first plate body is an inclined surface.

[0009] Optionally, the shell and the base are cylindrical structures, the shell and the base are coaxially arranged, the plurality of substrates are eccentrically arranged with the shell, the shell is rotatably connected with the base, and the sealing member closest to the upper end of the shell is rotatably connected with 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, and the plurality of transmission teeth 1 are sequentially staggered in the circumferential direction.

[0010] 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.

[0011] Optionally, magnets are respectively disposed inside the bottom of the culture dish and the opening of the cover of the culture dish.

[0012] Optionally, chamfers are provided on the outer side surfaces of the opening ends of the dish bottom and the dish cover.

[0013] Optionally, positioning pins are provided on the upper portion of the base, and the positioning pins are evenly distributed along a circle coaxial with the base plate, and the culture dish is arranged on the positioning pins.

[0014] Optionally, a vent hole is set in the middle of the base, the vent hole is coaxial with the substrate, one end of the vent hole is connected to a side of the base where the culture dish is set, the other end of the vent hole is connected to the side wall of the base, the output end of the air pump is connected to a ventilation pipe, and the other end of the ventilation pipe connected to the air pump is connected to one end of the vent hole connected to the side wall of the base.

[0015] Optionally, the public area air microorganism sampling device also includes a flow meter for calculating the sampling flow.

[0016] The beneficial effects of the present invention are: 1. The present invention provides a covered culture dish and an impact assembly, wherein an openable and closable porous plate is provided in the impact assembly. The culture dish cover is opened in the main machine, thereby reducing the contamination of the sampling result caused by placing the opened culture dish before sampling. The culture dish cover can also be covered after sampling and then the culture dish can be recovered, thereby reducing the sampling contamination during recovery.

[0017] 2. The present invention is provided with a transmission tooth 1 on the shell and a transmission tooth 2 on the rotating plate. When sampling, multiple culture dishes are placed at the same time. All the culture dishes can be opened for sampling by rotating the shell. All the sampled culture dishes can be covered by rotating the shell in the opposite direction. There is no need to place and cover them one by one. The operation is convenient, fast and not complicated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a public area air microorganism sampling device of the present invention; Figure 2 It is an exploded schematic diagram of the structure of a public area air microorganism sampling device of the present invention; Figure 3 It is a structural schematic diagram of the host in the present invention; Figure 4 for Figure 3 Cross-sectional view at AA in the middle (initial state with culture dish); Figure 5 for Figure 3 Another cross-sectional view at AA in the middle (sampling state with culture dish); Figure 6 for Figure 3 Cross-sectional view at AA in the middle (the initial state of the culture dish is omitted); Figure 7 for Figure 3 Cross-sectional view at AA in the middle (sampling state of the culture dish is omitted); Figure 8 for Figure 3 Sectional view at the middle BB; Fig. 9 This is a schematic diagram of the structure of the culture dish in the present invention in an open state (without the sealing member); Fig.10 It is a structural schematic diagram of the culture dish in the closed state in the present invention; Fig.11 for Figure 3 Another cross-sectional view of the middle AA (only one set of petri dishes); Fig.12 It is a schematic diagram of the structure of the culture dish in the present invention; Fig.13 for Fig.12 Cross-sectional view at CC.

[0019] in: 100, host; 110, shell; 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 tooth 1; 131, positioning pin; 132, vent; 181, first plate body; 182, boss; 183, limit table; 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 tooth 2; 1121, first transmission tooth 1; 1122, second transmission tooth 1; 1123, third transmission tooth 1; 1124, fourth transmission tooth 1; 1125, fifth transmission tooth 1; 1126, sixth transmission tooth 1; 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; 300. Chassis; 310. Ventilation pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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 used to limit the present invention.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 to the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] 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. The main unit 100 is connected to the chassis 300 for air extraction sampling.

[0024] The host 100 includes a housing 110, a sealing member 120, a base 130 and a plurality of impact assemblies 140. The plurality of impact assemblies 140 are disposed in the housing 110. The housing 110 is detachably disposed on the base 130, and the stacked culture dishes 200 are disposed 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 environmental sampling air to enter the housing 110. A plurality of impact assemblies 140 are arranged equidistantly in the vertical direction, each of the impact assemblies 140 comprises a base plate 170 and a porous plate 150, a through hole is arranged in the middle of the base plate 170, each porous plate 150 is composed of a plurality of unit plates 180 rotatably connected to the base plate 170, and a plurality of tiny holes are arranged on each unit plate 180; 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 arranged 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 one by one.

[0025] 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 dish bottom 210 and the dish cover 220 of each corresponding culture dish 200, and multiple culture dishes 200 are opened.

[0026] 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 .

[0027] It should be added that the chassis 300 includes an air pump, and the output end of the air pump is connected to the base 130. There is an air vent 132 in the middle of the base 130. When 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, which is used to make the sampled air flow through a number of 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 uppermost 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.

[0028] 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 arranged along the circumferential direction on the rotating plate 160, a plurality of cylindrical pins uniformly arranged along the circumferential direction are arranged on one surface of the base plate 170, each cylindrical pin corresponds to each slide groove one by one and the cylindrical pin slides in the slide groove, the rotating plate 160 is rotatably arranged on the base plate 170, and the sealing member 120 is fixedly arranged on the rotating plate 160; 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; one end of the unit plate 180 hinged to the base plate 170 is close to the through hole of the base plate 170, and one 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.

[0029] 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 allows the culture dish 200 to pass through. Fig. 9 , rotating the rotating plate 160 in the opposite direction, the plurality of unit plates 180 gather toward the center of the substrate 170 to form a closed porous plate 150, covering the through hole in the middle of the substrate 170, please refer to Fig.10 .

[0030] When in use, this embodiment takes six culture dishes 200 and six impact assemblies 140 as an example. When in 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 the state where the multiple unit plates 180 are not gathered, and there is a through space in the middle of the impact assembly 140; The culture dishes 200 stacked in sequence are placed in the space in the middle of the impact assembly 140, and the first rotating plate 161 is rotated, and the multiple unit plates 180 connected thereto are gathered toward the center of the circle. The unit plates 180 are gathered toward the center of the circle from the connection between the dish bottom 210 and the dish cover 220 of the first culture dish 201, and the dish cover 220 is lifted from the dish bottom 210 by a certain distance. At this time, the first culture dish 201 is opened, and the dish cover 220 of the first culture dish 201 and the other unopened culture dishes 200 placed thereon are lifted by the same distance. When the second culture dish 202 is rotated, the connection between the dish bottom 210 and the dish cover 220 of the second culture dish 202 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 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; the second rotating plate 162 is rotated, and the multiple unit plates 180 connected thereto gather toward the center of the circle, so that the second culture dish 202 is rotated. The cover 220 of the second culture dish 202 is lifted from the bottom 210 of the dish by a certain distance. At this time, the second culture dish 202 is opened, and the cover 220 of the second culture dish 202 and the other unopened culture dishes 200 placed thereon are lifted by the same distance. At this time, the connection between the bottom 210 and the cover 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 cover 220 of the third culture dish 203, so as to make the sampled gas The liquid flows from the space between the 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 in turn, so that the culture dishes 200 from bottom to top are opened in turn, and the air pump can be turned on to start sampling; After sampling, the sixth rotating plate 166 is rotated in the reverse direction, and the multiple unit plates 180 connected thereto are diffused in the circumferential direction of the substrate 170, and 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 diffused in the circumferential direction of the substrate 170, and 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, and it contacts 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 in sequence, and the culture dishes 200 from top to bottom are covered in sequence to the initial stacked state, and the collection of the sampled culture dishes 200 is completed.

[0031] 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 arranged 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 an inclined surface; when the unit plate 180 connected to the impact assembly 140 gathers 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 inclined surface of the boss 182, and is lifted by the inclined surface and is located on the plane at the upper end of the boss 182.

[0032] In a further embodiment, the shell 110 and the base 130 are cylindrical structures, the shell 110 and the base 130 are coaxially arranged, and the plurality of substrates 170 are eccentrically arranged with respect to the shell 110, then the culture dish 200 is eccentrically arranged with respect to the base 130, and the shell 110 is rotatably connected with the base 130; 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, an annular groove coaxial with the substrate 170 is provided at the bottom of the substrate 170, the sliding member slides in the annular groove of the substrate 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, the sliding member on the seal 120 at the uppermost end slides in the annular groove of the shell 110, and the seal 120 at the uppermost end is rotatably connected to the shell 110, and the air during sampling can only flow into the opened culture dish 200 through the porous plate 150.

[0033] A plurality of transmission teeth 112 corresponding to the positions of the rotating plate 160 are arranged on the inner side wall of the housing 110, and a transmission tooth 2 167 is arranged on the arc surface of the outer side of the rotating plate 160, and the plurality of transmission teeth 112 are sequentially staggered in the circumferential direction; From bottom to top, multiple transmission teeth 112 are defined as a first transmission tooth 1121, a second transmission tooth 1122, a third transmission tooth 1123, a fourth transmission tooth 1124, a fifth transmission tooth 1125 and a sixth transmission tooth 1126, and 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 meshed 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 from the meshing; then the second transmission tooth 1122 is meshed with the second transmission tooth 167 on the second rotating plate 162, and the second transmission tooth 1122 drives the second rotating plate 162 to rotate and then disengages from the meshing at the shortest distance between the impact assembly 140 and the inner wall of the housing 110; then the third transmission tooth 1123 is meshed with the transmission tooth 167 on the third rotating plate 163. The fourth transmission tooth 1124 is engaged with the second transmission tooth 167 on the fourth rotating plate 164 and then disengaged; the fifth transmission tooth 1125 is engaged with the second transmission tooth 167 on the fifth rotating plate 165 and then disengaged; the sixth transmission tooth 1126 is engaged with the second transmission tooth 167 on the sixth rotating plate 166 and then disengaged; all the transmission teeth 112 are 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.

[0034] 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 transmission tooth 2 167 on the sixth rotating plate 166 and then comes out, 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 transmission tooth 2 167 on the fifth rotating plate 165 and then comes out, 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.

[0035] 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, so that the sampled air can more easily enter the dish bottom 210, and the arc-shaped protrusion prevents the dish cover 220 from falling.

[0036] In further embodiments, please refer to Fig.12 and Fig.13 At the openings of the dish bottom 210 and the dish cover 220, magnets 230 that can be attracted are respectively arranged to facilitate the covering of the dish bottom 210 and the dish cover 220, and to prevent the dish cover 220 from sliding on the dish bottom 210 at will, thereby increasing the stability of the covering.

[0037] In a further embodiment, chamfers 240 are provided on the outer side surfaces 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.

[0038] In a further embodiment, positioning pins 131 coaxial with the base plate 170 and evenly distributed along the circumference are disposed on the upper portion of the base 130 , and the culture dish 200 is disposed on the positioning pins 131 .

[0039] 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 arranged, 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 pipe 310, and the other end of the vent pipe 310 connected to the air pump is connected to one end of the vent hole 132 connected to the side wall of the base 130.

[0040] In a further embodiment, the chassis 300 further includes a flow meter for calculating the sample flow.

[0041] The technical features of the above embodiments may 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.

[0042] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A public area air microorganism sampling device, characterized in that: include: A host, the host comprising a shell, a base and a plurality of impact assemblies, the shell having openings at both ends, a cover being detachably provided at one end of the shell, and the other end of the shell being detachably connected to the base, a plurality of the impact assemblies being equidistantly provided in the shell along a vertical direction, each of the impact assemblies comprising a base plate and a plurality of porous plates, a through hole being provided in the middle of the base plate, the porous plates comprising a plurality of unit plates rotatably connected to the base plate, and a plurality of holes being provided on each of the unit plates; A plurality of culture dishes, each of which comprises a dish bottom and a dish cover, wherein the dish cover is covered on the dish bottom, an agar layer is arranged in the dish bottom, a plurality of stacked culture dishes are placed on the base and located in the through hole of the substrate, and each of the impact assemblies corresponds to each of the culture dishes one by one; 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 hole on the base plate is opened, and a plurality of unopened culture dishes are stacked in sequence; when the impact assembly is in the closed state, the unit plate is extended and gathered at the center of the base plate to form a closed plate body, the multi-hole plate covers the through hole in the middle of the base plate, the multi-hole plate separates the dish bottom and the dish cover of each of the culture dishes, and a plurality of the culture dishes are opened; The host 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, 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.

2. The public area air microorganism sampling device according to claim 1 is characterized in that: The impact assembly also includes a rotating plate and a plurality of connecting rods, a plurality of slide grooves are evenly arranged along the circumferential direction on the rotating plate, the slide grooves are arc-shaped, the slide grooves are concentric with the rotating plate, a plurality of cylindrical pins are evenly arranged along the circumferential direction 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.

3. The public area air microorganism sampling device according to claim 2 is characterized in that: The unit plate comprises 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.

4. The public area air microorganism sampling device according to claim 3 is characterized in that: The shell and the base are cylindrical structures, the shell and the base are coaxially arranged, the plurality of substrates are eccentrically arranged with the shell, the shell is rotatably connected with the base, and the sealing member closest to the upper end of the shell is rotatably connected with 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, and the plurality of transmission teeth 1 are sequentially staggered in the circumferential direction.

5. The public area air microorganism sampling device according to claim 3 is characterized in that: A limit platform is arranged 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.

6. 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 cover of the culture dish.

7. The public area air microorganism sampling device according to claim 1, characterized in that: The outer side surfaces of the opening ends of the dish bottom and the dish cover are chamfered.

8. 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, and the positioning pins are evenly distributed along a circumference coaxial with the base plate, and the culture dish is arranged on the positioning pins.

9. The public area air microorganism sampling device according to claim 1, characterized in that: 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, 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.

10. 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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