Surface particle sampling head

Abstract

The invention provides a surface particle sampling head which comprises a shell, an air inlet pipe and an air suction pipe are arranged on the shell, the outlet end of the air inlet pipe and the inlet end of the air suction pipe face the surface of an object to be sampled, and an air medium can be blown to the surface of the object through the air inlet pipe and then sucked out through the air suction pipe. According to the surface particle sampling head, air is blown to the surface of an object to be sampled through the air inlet pipe, floating and sinking, fibers, flora and the like on the surface of the object are blown up and then sucked by the air suction pipe, the capturing structure is synchronously arranged at the rear section for capturing, then parameters such as environment quality and product quality are evaluated, and the structure is wide in application range, simple in structure and convenient to operate. The manufacturing cost is low.

Description

Technical Field

[0001] The invention belongs to the field of surface sampling of objects, and in particular relates to a surface particle sampling head. Background Art

[0002] Surface sampling is the process of collecting a sample from a surface, typically to detect the presence of microorganisms or other substances. Below are several common surface sampling methods.

[0003] Swab method:

[0004] Materials: Sterile sampling frame (plastic or stainless steel), moistened swab, sampling solution.

[0005] Steps: First, use a sterile sampling frame to determine the sampling area. Then, soak the swab in the diluent and apply it twice to the surface to be tested by slowly rotating the swab parallel to the surface. After sampling, place the swab in a test tube containing the sampling solution.

[0006] ‌Eluent method‌:

[0007] Materials: Sterile diluent.

[0008] Steps: Elute the sample with a sterile diluent 10 times the volume of the sample to obtain the sample stock solution. This method is suitable for whole poultry, dried fruits, vegetables and other foods, but the results only represent the total number of bacteria on the sample surface.

[0009] Tape method:

[0010] Materials: Self-adhesive tape or labels, sterile adhesive rack.

[0011] Steps: Press the tape onto the surface of the substance to be tested to take a sample, then stick it back onto the adhesive holder. After delivery to the laboratory, remove the tape from the adhesive holder and press it onto the surface of the desired culture medium.

[0012] Agar intestinal method:

[0013] Materials: sterile agar medium, sterile plastic tray.

[0014] Steps: Fill the center of the plastic plate with sterile agar medium to form a convex surface, press the agar surface onto the sample surface, take the sample, and culture it at an appropriate temperature.

[0015] ‌Touch-piece method‌:

[0016] Materials: Sterile contact pads, culture medium.

[0017] ‌Steps‌: Press the probe onto the sample surface, take the sample and place it on a culture dish for culture.

[0018] In addition, when conducting quality inspection on a dust-free environment, dust and fibers are aspirated from the rated area of the dust-free environment. When conducting quality inspection on a textile fabric, fibers are extracted from the fabric surface.

[0019] These methods have their own advantages and disadvantages and are suitable for different sampling requirements and environments. For example, the swab method is suitable for sampling large-area surfaces, while the rinsing method is suitable for sampling food surfaces. Selecting the appropriate sampling method can improve sampling efficiency and accuracy. In the prior art, when sampling the surface of an object, different sampling environments and sampling objects require different specifications of sampling heads, which is complex to operate and has a high supporting cost. Summary of the Invention

[0020] In view of this, the present invention aims to provide a surface particle sampling head to solve the problems in the prior art that different sampling environments and sampling objects require different specifications of sampling heads, which is complex to operate and has a high supporting cost when sampling the surface of an object.

[0021] To achieve the above object, the technical solution of the present invention is realized as follows:

[0022] A surface particle sampling head includes a housing. An air inlet pipe and an air extraction pipe are provided on the housing. The outlet end of the air inlet pipe and the inlet end of the air extraction pipe are respectively oriented towards the surface of the object to be sampled, and the gas medium can be blown from the air inlet pipe onto the object surface and then sucked out by the air extraction pipe.

[0023] Further, an air inlet flow channel and an air extraction flow channel are respectively provided in the housing. The inlet end of the air inlet flow channel is connected to the air inlet pipe, and the outlet end of the air extraction flow channel is connected to the air extraction pipe. The inlet end of the air extraction flow channel is located in the middle of the lower end of the housing, and the outlet ends of two air inlet flow channels are respectively provided on both sides of the inlet end of the air extraction flow channel.

[0024] Further, the outlet end of the air inlet flow channel is angled relative to the surface of the object to be sampled.

[0025] Further, the air extraction flow channel is a gradually reduced-diameter structure. The outlet end of the air extraction flow channel is the small-diameter end, and the inlet end of the air extraction flow channel is the large-diameter end.

[0026] Further, an opening groove is provided at the lower end of the housing, and the air inlet flow channel and the air extraction flow channel are respectively communicated with the opening groove.

[0027] Further, a plurality of adjusting plates are provided at the lower end of the housing, and the plurality of adjusting plates are arranged in parallel. Each adjusting plate is located at the inlet end of the air extraction flow channel, and flow gaps are provided between two adjacent adjusting plates and between each adjusting plate and the inner wall of the outer shell.

[0028] Further, a plurality of air guiding grooves are provided at the lower end of the adjusting plate. The plurality of air guiding grooves are arranged in parallel with each other, and the lower end surface of each adjusting plate is flush with the top surface of the opening groove. The air guiding grooves are used to introduce the gas medium at the outlet end of the air inlet flow channel into the flow-through gap.

[0029] Further, the housing, the air inlet pipe, the adjusting plate and the air extraction pipe are of an integral structure.

[0030] Further, two adjusting plates are arranged at the lower end of the housing. The air inlet end of the air extraction flow channel is provided between the two adjusting plates. The air outlet end of the air inlet flow channel is on the side of each adjusting plate away from the air extraction flow channel. A plurality of air guiding grooves are provided on each adjusting plate, and the air guiding grooves on the two adjusting plates are arranged in a staggered manner.

[0031] Further, the staggered air guiding grooves are of a complementary structure, and the width of the air guiding grooves is greater than the width between two adjacent air guiding grooves.

[0032] Compared with the prior art, the surface particle sampling head of the present invention has the following beneficial effects:

[0033] (1) For the surface particle sampling head of the present invention, air is blown onto the surface of the object to be sampled through the air inlet pipe, so as to blow up the floating dust, fibers, bacteria, etc. on the object surface, and then sucked by the air extraction pipe. A capture structure is synchronously arranged in the latter section for capture, and then parameters such as environmental quality and product quality are evaluated. This structure has a wide range of applications, is simple in structure, and has a low manufacturing cost.

[0034] (2) For the surface particle sampling head of the present invention, the outlet end of the air inlet flow channel is angled relative to the surface of the object to be sampled, so that the airflow impacting the surface of the object to be sampled can impact into the air extraction flow channel. At the same time, the air extraction flow channel is a gradually reducing diameter structure such as a funnel shape. The outlet end of the air extraction flow channel is the small diameter end, and the inlet end of the air extraction flow channel is the large diameter end, so that the air medium can be gradually pressurized during air extraction, and the suction force of the air extraction pipe and the air extraction flow channel can be improved.

[0035] (3) For the surface particle sampling head of the present invention, the opening groove is a power balance structure of the compressor and the vacuum pumping device, which can reduce the accuracy of selecting the supporting equipment, so as to reduce the cost of the supporting equipment and the debugging cost. And setting the opening groove can reduce the adsorption force of the sampling head on the object surface, prevent damage to the object surface, and facilitate the movement of the sampling head on the object surface.

[0036] (4) For the surface particle sampling head of the present invention, the adjusting plate is used to adjust the flow-through area at the inlet end of the air extraction flow channel, and the flow-through path is defined by the air guiding grooves, so as to improve the suction quality of the air extraction flow channel. And the housing, the air inlet pipe, the adjusting plate and the air extraction pipe are of an injection molding integral structure, which can reduce the production cost and improve the production efficiency. Description of the Drawings

[0037] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not unduly limit the present invention. In the drawings:

[0038] Figure 1 is a schematic structural diagram of the first perspective of the surface particle sampling head according to an embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of the second perspective of the surface particle sampling head according to an embodiment of the present invention;

[0040] Figure 3 is a schematic side view of the surface particle sampling head according to an embodiment of the present invention;

[0041] Figure 4 is a schematic vertical sectional view of the surface particle sampling head according to an embodiment of the present invention;

[0042] Figure 5 is a schematic transverse sectional view along the axis of the intake pipe according to an embodiment of the present invention;

[0043] Figure 6 is a schematic transverse sectional view along the axis of the extraction pipe according to an embodiment of the present invention;

[0044] Figure 7 is a schematic structural diagram of the adjustment plate provided at the inlet end of the extraction flow channel according to an embodiment of the present invention;

[0045] Figure 8 is a schematic bottom view of the adjustment plate provided at the inlet end of the extraction flow channel according to an embodiment of the present invention;

[0046] Figure 9 is a sampling effect diagram of the adjustment plate provided at the end of the surface particle sampling head according to an embodiment of the present invention;

[0047] Figure 10 is a sampling effect diagram of the surface particle sampling head without the adjustment plate provided at the end according to an embodiment of the present invention.

[0048] Explanation of reference numerals:

[0049] 1. Housing; 11. Intake air flow channel; 12. Extraction air flow channel; 13. Open slot; 2. Intake pipe; 3. Extraction pipe; 4. Adjustment plate; 41. Flow-through gap; 42. Air guide groove; 43. Lower end face. Detailed implementation manners

[0050] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0052] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0053] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0054] As Figures 1-9 shown, the surface particle sampling head includes a housing 1, an intake pipe 2 and an extraction pipe 3 are arranged on the housing 1. The intake pipe 2 is connected to an external compressor, and the extraction pipe 3 is connected to an external vacuum extraction device. The outlet end of the intake pipe 2 and the inlet end of the extraction pipe 3 are respectively oriented towards the surface of the object to be sampled. The gas medium can be blown from the intake pipe 2 onto the object surface and then sucked out by the extraction pipe 3. By blowing air through the intake pipe 2 onto the surface of the object to be sampled, the dust, fibers, bacteria, etc. on the object surface are blown up, and then sucked by the extraction pipe 3. A capture structure is synchronously arranged in the later stage for capture, and then parameters such as environmental quality and product quality are evaluated. This structure has a wide range of applications, is simple in structure, and has a low manufacturing cost. The above capture structure is a capture net, capture film or capture dish and other structures of the prior art, and can be selected according to the applicable working conditions, and will not be elaborated here.

[0055] Inside the housing 1, an intake air flow path 11 and an extraction air flow path 12 are respectively provided. The inlet end of the intake air flow path 11 is connected to the intake pipe 2, and the outlet end of the extraction air flow path 12 is connected to the extraction pipe 3. The inlet end of the extraction air flow path 12 is located in the middle of the lower end of the housing 1, and the outlet ends of two intake air flow paths 11 are respectively arranged on both sides of the inlet end of the extraction air flow path 12, so as to supply air simultaneously on both sides of the extraction air flow path 12. As Figure 4 , Figure 5 and Figure 6 shown, the outlet end of the intake air flow path 11 is angled relative to the surface of the object to be sampled, so that the air flow impacting the surface of the object to be sampled can impact into the extraction air flow path 12. At the same time, the extraction air flow path 12 is a gradually reducing diameter structure such as a funnel shape. The outlet end of the extraction air flow path 12 is the small diameter end, and the inlet end of the extraction air flow path 12 is the large diameter end, so that the air medium can be gradually pressurized during extraction, improving the suction force of the extraction pipe 3 and the extraction air flow path 12.

[0056] An opening groove 13 is provided at the lower end of the housing 1. The intake air flow path 11 and the extraction air flow path 12 are respectively communicated with the opening groove 13. The opening groove 13 is a power balance structure for the compressor and the vacuum extraction device, which can reduce the accuracy of selecting supporting equipment, so as to reduce the cost of supporting equipment and the commissioning cost. When the power of the vacuum extraction device is large, the negative pressure inside the housing 1 can be balanced through the opening groove 13. In order to improve the sampling accuracy, usually the power of the vacuum extraction device is greater than that of the compressor, and setting the opening groove 13 can reduce the adsorption force of the sampling head on the object surface, prevent damage to the object surface, and facilitate the movement of the sampling head on the object surface.

[0057] A plurality of adjusting plates 4 are arranged at the lower end of the housing 1, and the plurality of adjusting plates 4 are arranged in parallel with each other. Each adjusting plate 4 is located at the inlet end of the extraction air flow path 12, and an air flow gap 41 is provided between two adjacent adjusting plates 4 and between each adjusting plate 4 and the inner wall of the outer shell; a plurality of air guiding grooves 42 are provided at the lower end of the adjusting plate 4, and the plurality of air guiding grooves 42 are arranged in parallel with each other. The lower end surface 43 of each adjusting plate 4 is flush with the top surface of the opening groove 13. The air guiding grooves 42 are used to guide the air medium at the outlet end of the intake air flow path 11 into the air flow gap 41. The adjusting plate 4 is used to adjust the flow area at the inlet end of the extraction air flow path 12, and the air flow path is limited through the air guiding grooves 42, so as to improve the suction quality of the extraction air flow path 12. For the convenience of production, in this embodiment, the housing 1, the intake pipe 2, the adjusting plate 4 and the extraction pipe 3 are of an integral structure.

[0058] As Figure 7 and Figure 8As shown in the figure, two adjusting plates 4 are provided in this embodiment. The intake end of the air extraction flow channel 12 is provided between the two adjusting plates 4. The outlet end of the air intake flow channel 11 is on the side of each adjusting plate 4 away from the air extraction flow channel 12. A plurality of air guiding grooves 42 are provided on each adjusting plate 4, and the air guiding grooves 42 on the two adjusting plates 4 are arranged staggeredly, and the staggeredly arranged air guiding grooves 42 are complementary structures. During implementation, the width of the air guiding grooves 42 is greater than the width between two adjacent air guiding grooves 42, so that the air guiding grooves 42 on the two adjusting plates 4 can cover the surface of the item to be taken.

[0059] Sampling process of the surface particle sampling head: In this embodiment, the carrier to be sampled is an acrylic board, the particulate matter to be sampled is dust, the blowing air flow rate is 1.1 m³ / h, the suction air flow rate is 1.4 m³ / h, and the dust is collected by hitting an attached sticky vessel through the air flow, such as Figure 9 and Figure 10 As shown, the observation area is an area with a diameter of 2.5 mm. Setting the adjusting plate 4 at the lower end of the housing 1 can significantly increase the number of collected dust particles.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A surface particle sampling head, characterized in that: It includes a housing (1), an air inlet pipe (2) and an air extraction pipe (3) are arranged on the housing (1), the outlet end of the air inlet pipe (2) and the inlet end of the air extraction pipe (3) are respectively oriented towards the surface of the object to be sampled, and the gas medium can be blown from the air inlet pipe (2) towards the object surface and then sucked out by the air extraction pipe (3). An air inlet flow channel (11) and an air extraction flow channel (12) are respectively arranged inside the housing (1), the inlet end of the air inlet flow channel (11) is connected to the air inlet pipe (2), the outlet end of the air extraction flow channel (12) is connected to the air extraction pipe (3), and the inlet end of the air extraction flow channel (12) is located in the middle of the lower end of the housing (1), and the outlet ends of two air inlet flow channels (11) are respectively arranged on both sides of the inlet end of the air extraction flow channel (12). An opening groove (13) is arranged at the lower end of the housing (1), and the air inlet flow channel (11) and the air extraction flow channel (12) are respectively communicated with the opening groove (13). A plurality of adjusting plates (4) are arranged at the lower end of the housing (1), and the plurality of adjusting plates (4) are arranged in parallel with each other. Each adjusting plate (4) is located at the inlet end of the air extraction flow channel (12), and an air flow gap (41) is arranged between every two adjusting plates (4) and between each adjusting plate (4) and the inner wall of the outer shell.

2. The surface particle sampling head according to claim 1, characterized in that: The outlet end of the air inlet flow channel (11) has an angle relative to the surface of the object to be sampled.

3. The surface particle sampling head according to claim 1, characterized in that: The air extraction flow channel (12) is a gradually reducing diameter structure, the outlet end of the air extraction flow channel (12) is the small diameter end, and the inlet end of the air extraction flow channel (12) is the large diameter end.

4. The surface particle sampling head according to claim 1, wherein: A plurality of air guiding grooves (42) are arranged at the lower end of the adjusting plate (4), the plurality of air guiding grooves (42) are arranged in parallel with each other, and the lower end surface (43) of each adjusting plate (4) is flush with the top surface of the opening groove (13). The air guiding grooves (42) are used to guide the gas medium at the outlet end of the air inlet flow channel (11) into the air flow gap (41).

5. The surface particle sampling head according to claim 4, characterized in that: Two adjusting plates (4) are arranged at the lower end of the housing (1), the inlet end of the air extraction flow channel (12) is arranged between the two adjusting plates (4), the outlet end of the air inlet flow channel (11) is on the side of each adjusting plate (4) away from the air extraction flow channel (12), and a plurality of air guiding grooves (42) are arranged on each adjusting plate (4), and the air guiding grooves (42) on the two adjusting plates (4) are arranged in a staggered manner.

6. The surface particle sampling head according to claim 5, characterized in that: The staggered air guiding grooves (42) are complementary structures, and the width of the air guiding grooves (42) is greater than the width between every two air guiding grooves (42).

7. The surface particle sampling head according to claim 1, characterized in that: The housing (1), the air inlet pipe (2), the adjusting plate (4) and the air extraction pipe (3) are of an integral structure.

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