Surface particle sampling head

Abstract

The present invention provides a surface particle sampling head, comprising a housing, on which an air inlet pipe and an air extraction pipe are disposed. The outlet end of the air inlet pipe and the inlet end of the air extraction pipe are respectively directed toward the surface of the object to be sampled. The air medium can be blown toward the surface of the object through the air inlet pipe and then sucked out by the air extraction pipe. The surface particle sampling head of the present invention blows air toward the surface of the object to be sampled through the air inlet pipe, blowing up floating particles, fibers, bacterial flora, etc. on the surface of the object, which are then sucked up by the air extraction pipe. A capture structure is synchronously provided at the rear end for capturing the particles, thereby evaluating parameters such as environmental quality and product quality. The structure has a wide range of applications, is simple in structure, and has low manufacturing costs.

Description

Technical Field

[0001] The invention belongs to the field of object surface sampling, 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 inspections on dust-free environments, dust and fiber absorption is performed on the rated area of ​​the dust-free environment. When conducting quality inspections on textile fabrics, fiber extraction is performed on the surface of the fabric.

[0019] Each of these methods has its own advantages and disadvantages, and is suitable for different sampling needs and environments. For example, the swab method is suitable for sampling large surfaces, while the rinse method is suitable for sampling food surfaces. Choosing the right sampling method can improve sampling efficiency and accuracy. Existing techniques for sampling surfaces require different sampling heads of varying specifications to suit different sampling environments and objects, resulting in complex operations and high costs. Summary of the Invention

[0020] In view of this, the present invention aims to propose a surface particle sampling head to solve the problem that in the prior art, when sampling the surface of an object, different sampling environments and sampling objects require sampling heads of different specifications, which results in complex operation and high supporting costs.

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

[0022] A surface particle sampling head comprises a shell, on which an air inlet pipe and an air extraction pipe are arranged. The outlet end of the air inlet pipe and the inlet end of the air extraction pipe are respectively directed toward the surface of the object to be sampled. The gas medium can be blown toward the surface of the object through the air inlet pipe and then sucked out by the air extraction pipe.

[0023] Furthermore, an intake duct and an exhaust duct are respectively provided in the shell, and the inlet end of the intake duct is connected to the intake pipe, and the outlet end of the exhaust duct is connected to the exhaust pipe, and the inlet end of the exhaust duct is located in the middle of the lower end of the shell, and an outlet end of the intake duct is respectively provided on both sides of the inlet end of the exhaust duct.

[0024] Furthermore, the outlet end of the inlet air channel is provided with an angle relative to the surface of the object to be sampled.

[0025] Furthermore, the air extraction channel is a gradually decreasing diameter structure, the outlet end of the air extraction channel is a small diameter end, and the inlet end of the air extraction channel is a large diameter end.

[0026] Furthermore, an open slot is provided at the lower end of the shell, and the air inlet channel and the air exhaust channel are respectively connected to the open slot.

[0027] Furthermore, a plurality of adjustment plates are provided at the lower end of the shell, and the plurality of adjustment plates are arranged parallel to each other, each adjustment plate is located at the inlet end of the exhaust air duct, and a flow gap is provided between each adjustment plate and between each adjustment plate and the inner wall of the shell.

[0028] Furthermore, the lower end of the adjustment plate is provided with multiple air guide grooves, which are arranged parallel to each other, and the lower end surface of each adjustment plate is flush with the top surface of the open groove. The air guide grooves are used to guide the gas medium at the outlet end of the inlet flow channel into the flow gap.

[0029] Furthermore, the shell, the air inlet pipe, the adjustment plate and the air extraction pipe are an integrated structure.

[0030] Furthermore, two adjustment plates are provided at the lower end of the shell, and the air inlet end of the exhaust air duct is provided between the two adjustment plates. The side of each adjustment plate away from the exhaust air duct is the air outlet end of the intake air duct. Each adjustment plate is provided with multiple air guide grooves, and the air guide grooves on the two adjustment plates are staggered.

[0031] Furthermore, the staggered air guide grooves are complementary structures, and the width of the air guide grooves is greater than the width between any two air guide grooves.

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

[0033] (1) The surface particle sampling head of the present invention blows air toward the surface of the object to be sampled through the air inlet pipe, blows up the floating particles, fibers, bacterial flora, etc. on the surface of the object, and then absorbs them through the exhaust pipe. A capture structure is synchronously provided in the rear section to capture them, and then evaluate parameters such as environmental quality and product quality. This structure has a wide range of uses, a simple structure, and a low manufacturing cost.

[0034] (2) The surface particle sampling head described in the present invention has an outlet end of the air inlet channel set at an angle 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 the air extraction channel. At the same time, the air extraction channel is a funnel-shaped structure with a gradually decreasing diameter. The outlet end of the air extraction channel is a small-diameter end, and the inlet end of the air extraction channel is a large-diameter end, so that the gas medium can be gradually pressurized during the extraction, thereby improving the suction force of the extraction pipe and the air extraction channel.

[0035] (3) The surface particle sampling head of the present invention has an opening slot, which is a power balance structure of the compressor and the vacuum equipment, and can reduce the accuracy of selecting the supporting equipment, thereby reducing the cost and debugging cost of the supporting equipment. The opening slot can also reduce the suction force of the sampling head on the surface of the object, thereby preventing damage to the surface of the object and facilitating the movement of the sampling head on the surface of the object.

[0036] (4) In the surface particle sampling head described in the present invention, the regulating plate is used to adjust the flow area at the inlet end of the air extraction channel, and the flow path is limited by the air guide groove to improve the suction quality of the air extraction channel. In addition, the shell, air inlet pipe, regulating plate and air extraction pipe are an integrated injection molding structure, which can reduce production costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

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

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

[0041] Figure 4 A vertical cross-sectional schematic diagram of a surface particle sampling head according to an embodiment of the present invention;

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

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

[0044] Figure 7 This is a structural diagram of an embodiment of the present invention in which an adjustment plate is provided at the inlet end of the air extraction channel;

[0045] Figure 8 A bottom view schematically showing an adjustment plate provided at the inlet end of the air exhaust duct according to an embodiment of the present invention;

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

[0047] Figure 10 This is a sampling effect diagram of the surface particle sampling head described in an embodiment of the present invention without an adjustment plate at the end thereof.

[0048] Description of reference numerals:

[0049] 1. Shell; 11. Inlet air duct; 12. Exhaust air duct; 13. Opening slot; 2. Inlet pipe; 3. Exhaust pipe; 4. Adjustment plate; 41. Flow gap; 42. Air guide groove; 43. Lower end surface. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 limiting 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 indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

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

[0054] like Figures 1-9 As shown, the surface particle sampling head includes a shell 1, on which an air inlet pipe 2 and an air extraction pipe 3 are arranged, the air inlet pipe 2 is connected to an external compressor, and the air extraction pipe 3 is connected to an external vacuum pumping device, and the outlet end of the air inlet pipe 2 and the inlet end of the air extraction pipe 3 are respectively directed to the surface of the object to be sampled, and the gas medium can be blown to the surface of the object by the air inlet pipe 2 and then sucked out by the air extraction pipe 3, and air is blown to the surface of the object to be sampled through the air inlet pipe 2 to blow up the floating sediment, fiber, bacterial flora, etc. on the surface of the object, and then sucked by the air extraction pipe 3, and a capture structure is synchronously provided in the rear section for capture, and then parameters such as environmental quality and product quality are evaluated. This structure has a wide range of uses, a simple structure, and a low production cost, and the above-mentioned capture structure is a capture net, capture membrane or capture dish or other structures in the prior art, which can be selected according to the applicable working conditions and will not be elaborated here.

[0055] An inlet flow channel 11 and an exhaust flow channel 12 are respectively provided in the shell 1, and the inlet end of the inlet flow channel 11 is connected to the air intake pipe 2, and the outlet end of the exhaust flow channel 12 is connected to the exhaust pipe 3, and the inlet end of the exhaust flow channel 12 is located in the middle of the lower end of the shell 1, and an outlet end of the inlet flow channel 11 is respectively provided on both sides of the inlet end of the exhaust flow channel 12, so that air can be supplied to both sides of the exhaust flow channel 12 at the same time. Figure 4 、 Figure 5 and Figure 6 As shown, the outlet end of the air inlet duct 11 is provided with an angle 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 the air exhaust duct 12. At the same time, the air exhaust duct 12 is a funnel-shaped structure with a gradually decreasing diameter. The outlet end of the air exhaust duct 12 is a small-diameter end, and the inlet end of the air exhaust duct 12 is a large-diameter end, so that the gas medium can be gradually pressurized during the extraction, thereby improving the suction force of the exhaust pipe 3 and the air exhaust duct 12.

[0056] An open groove 13 is provided at the lower end of the shell 1, and the inlet air duct 11 and the exhaust air duct 12 are respectively connected to the open groove 13. The open groove 13 is a power balancing structure for the compressor and the vacuum equipment, which can reduce the accuracy of selecting supporting equipment to reduce the cost and debugging cost of the supporting equipment. When the power of the vacuum equipment is large, the negative pressure in the shell 1 can be balanced through the open groove 13. In order to improve the sampling accuracy, the power of the vacuum equipment is usually greater than the power of the compressor, and the provision of the open groove 13 can reduce the suction force of the sampling head on the surface of the object, prevent damage to the surface of the object, and facilitate the movement of the sampling head on the surface of the object.

[0057] A plurality of adjustment plates 4 are provided at the lower end of the shell 1, and the plurality of adjustment plates 4 are arranged parallel to each other, each adjustment plate 4 is located at the inlet end of the exhaust flow duct 12, and a flow gap 41 is provided between each of the adjustment plates 4 and between each adjustment plate 4 and the inner wall of the shell; a plurality of air guide grooves 42 are provided at the lower end of the adjustment plate 4, and the plurality of air guide grooves 42 are arranged parallel to each other, and the lower end surface 43 of each adjustment plate 4 is flush with the top surface of the opening groove 13, and the air guide groove 42 is used to guide the gas medium at the outlet end of the inlet flow duct 11 into the flow gap 41, and the adjustment plate 4 is used to adjust the flow area at the inlet end of the exhaust flow duct 12, and the flow path is limited by the air guide groove 42, so as to improve the suction quality of the exhaust flow duct 12, and for the convenience of production, the shell 1, the air inlet pipe 2, the adjustment plate 4 and the exhaust pipe 3 of this embodiment are an integrated structure.

[0058] like Figure 7 and Figure 8As shown, in this embodiment, two adjustment plates 4 are provided, and an air inlet end of the air extraction duct 12 is provided between the two adjustment plates 4. The side of each adjustment plate 4 away from the air extraction duct 12 is the air outlet end of the air inlet duct 11. Each adjustment plate 4 is provided with a plurality of air guide grooves 42, and the air guide grooves 42 on the two adjustment plates 4 are staggered, and the staggered air guide grooves 42 are complementary structures. During implementation, the width of the air guide grooves 42 is greater than the width between the two air guide grooves 42, so that the air guide grooves 42 on the two adjustment plates 4 can cover the surface of the items to be taken.

[0059] Sampling process of surface particle sampling head: In this embodiment, the carrier to be sampled is an acrylic plate, the particle observation object to be sampled is dust, the blowing flow rate is 1.1m³ / h, the suction flow rate is 1.4m³ / h, and the dust is collected by the airflow impacting the attached sticky container. Figure 9 and Figure 10 As shown, the observation area is an area with a diameter of 2.5 mm. Providing an adjustment plate 4 at the lower end of the shell 1 can significantly increase the amount of collected dust particles.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Surface particle sampling head, characterized by: The invention comprises a shell (1), an air inlet pipe (2) and an air extraction pipe (3) are arranged on the shell (1), the outlet end of the air inlet pipe (2) and the inlet end of the air extraction pipe (3) are respectively directed toward the surface of the object to be sampled, and the gas medium can be blown toward the surface of the object through the air inlet pipe (2) and then sucked out by the air extraction pipe (3); An air intake channel (11) and an air exhaust channel (12) are respectively provided in the housing (1), and the inlet end of the air intake channel (11) is connected to the air intake pipe (2), and the outlet end of the air exhaust channel (12) is connected to the air exhaust pipe (3), and the inlet end of the air exhaust channel (12) is located in the middle of the lower end of the housing (1), and an outlet end of the air intake channel (11) is respectively provided on both sides of the inlet end of the air exhaust channel (12); An open slot (13) is provided at the lower end of the housing (1), and the air inlet channel (11) and the air exhaust channel (12) are respectively connected to the open slot (13); A plurality of adjustment plates (4) are provided at the lower end of the housing (1), and the plurality of adjustment plates (4) are arranged parallel to each other, each adjustment plate (4) is located at the inlet end of the air extraction channel (12), and a flow gap (41) is provided between each of the adjustment plates (4) and between each adjustment plate (4) and the inner wall of the housing; The lower end of the adjustment plate (4) is provided with a plurality of air guide grooves (42), the plurality of air guide grooves (42) are arranged parallel to each other, and the lower end surface (43) of each adjustment plate (4) is flush with the top surface of the opening groove (13), and the air guide groove (42) is used to guide the gas medium at the outlet end of the inlet flow channel (11) into the flow gap (41); Two adjustment plates (4) are provided at the lower end of the housing (1), an air inlet end of the air extraction channel (12) is provided between the two adjustment plates (4), a side of each adjustment plate (4) away from the air extraction channel (12) is an air outlet end of the air inlet channel (11), and each adjustment plate (4) is provided with a plurality of air guide grooves (42), and the air guide grooves (42) on the two adjustment plates (4) are arranged in a staggered manner.

2. The surface particle sampling head according to claim 1, characterized in that: The outlet end of the inlet flow channel (11) is arranged at 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 channel (12) is a gradually reducing diameter structure, the outlet end of the air extraction channel (12) is a small diameter end, and the inlet end of the air extraction channel (12) is a large diameter end.

4. The surface particle sampling head according to claim 1, characterized in that: The staggered air guide grooves (42) are a complementary structure, and the width of the air guide grooves (42) is greater than the width between any two air guide grooves (42).

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

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