Full-automatic air permeability tester

Abstract

The invention relates to the field of paper air permeability detection instruments, and discloses a highly-integrated full-automatic air permeability tester which comprises an upper pressing mechanism, a lifting mechanism, an air source mechanism, a flow monitoring mechanism and a supporting body and can rapidly and accurately measure the air permeability of insulation paper, paper tube paper, paper, paperboards and the like. According to the air permeability tester, the lower pressing disc moves upwards to clamp a sample, the distance of the lower pressing disc is short, the lower pressing disc ascends through a thin film and air pressure, the sample can be rapidly clamped, space can be saved to the maximum extent, and the air permeability tester is simple in structure and easy to install.

Description

Technical Field

[0001] The invention relates to the field of paper air permeability detection instruments, in particular to a full-automatic air permeability tester. Background Art

[0002] In industries such as papermaking, packaging, and cigarettes, the air permeability of insulation paper, paper tube paper, and paperboard is a key indicator of product quality, directly impacting product performance and user experience. Air permeability refers to the volume of air that passes through a sample (such as insulation paper, paper tube paper, or paperboard) per unit area per unit time under a given pressure differential. It is one of the most important physical indicators for measuring paper performance.

[0003] For example, during the printing process, the air permeability of paper directly affects the ink's drying speed and adhesion. The air permeability of coated paper (such as coated paper and coated whiteboard) affects the uniformity and adhesion of the coating layer. Excessively high air permeability in food packaging can make food susceptible to moisture, oxidation, or microbial contamination. Low air permeability can prevent gas exchange within the packaging, accelerating food spoilage (e.g., hindering the respiration of fresh fruits and vegetables). The air permeability of industrial packaging paper (such as carton paper and moisture-proof paper) affects its moisture and dust resistance. For example, packaging paper used to transport precision instruments or electronic products requires low air permeability to isolate external moisture and dust. In the tobacco industry, excessive air permeability in cigarette paper can cause cigarettes to burn too quickly, affecting the smoking experience. Low air permeability can lead to incomplete combustion and the production of excessive harmful substances. Excessively high air permeability in filter paper (such as coffee filters and oil filters) can result in incomplete filtration, while low air permeability can reduce the amount of liquid or gas that can pass through due to excessive resistance.

[0004] Therefore, it is necessary to monitor the air permeability of various types of paper or cardboard. Therefore, it is necessary to design a highly versatile, fully automatic air permeability tester. This tester often includes upper and lower pressure plates for clamping the sample. Currently, most air permeability testers use manual pressure to clamp the sample. However, air permeability testers like the one in this application, which use upper and lower pressure plates to automatically clamp the sample, are often complex in design and occupy a large space. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a full-automatic air permeability tester.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A fully automatic air permeability tester, comprising an upper pressure mechanism, a lifting mechanism, an air source mechanism, a flow monitoring mechanism, and a supporting body; the supporting body comprising a housing, a support plate, and a base, the support plate being detachably fixed above the base; the air source mechanism being disposed on the housing and the support plate, and comprising an air source processing element, a fluid control valve, and a precision pressure regulating valve; the flow monitoring mechanism comprising a flow sensor and a pressure sensor; the upper pressure mechanism being detachably fixed to the bottom of the support plate, the lifting mechanism being detachably disposed within the base, the upper surface of the lifting mechanism being flush with the upper surface of the base; The upper pressing mechanism includes an upper pressing plate, which is detachably fixed to the bottom of the support plate; The lifting mechanism includes a lower pressure plate, a pressure ring, a lower pressure plate seat, an air guide channel, and an elastic film; a groove is provided inside the lower pressure plate seat, and a circle of islands is provided at the bottom of the groove. The elastic film can be removably placed on the island and forms an air guide chamber with the bottom of the groove; the pressure ring is a hollow cylinder, and the pressure ring can be removably placed on the elastic film, and the lower pressure plate is placed in the hollow position of the pressure ring, facing the upper pressure plate; the air guide channel is provided below the groove of the lower pressure plate seat, one end of which is connected to the air guide chamber, and the other end is connected to the outside of the lower pressure plate seat.

[0007] Preferably, a push rod is further provided at the rear of the base, and the front end of the push rod is detachably connected to the air guide channel.

[0008] Preferably, the air guide channel has a connecting component extending outward, a connecting hole is provided in the middle of the front end of the push rod, and the connecting component can be connected to the connecting hole by mortise and tenon.

[0009] Preferably, the lower pressure plate seat, the elastic film and the pressure ring are fixed by bolts.

[0010] Preferably, the lower pressure plate is provided with an exhaust hole and an exhaust channel, the exhaust hole passes through the upper surface of the lower pressure plate and is connected with the exhaust channel, and the exhaust channel is provided inside the lower pressure plate and extends horizontally to connect with the outside of the lower pressure plate.

[0011] Preferably, the upper surface of the lower pressure plate is provided with concentric grooves, and the top of the cross-section of the lower pressure plate is serrated.

[0012] Preferably, a sealing ring is provided between the upper pressure plate and the lower pressure plate.

[0013] Preferably, the air source processing element is connected to the fluid control valve, the fluid control valve is connected to the precision pressure regulating valve through a pipeline, the precision pressure regulating valve is connected to the flow sensor through a pipeline, the flow sensor is connected to the support plate through a pipeline, and the pressure sensor is arranged on the support plate.

[0014] Preferably, a cover is provided around the upper pressure plate, and the cover is fixed to the bottom of the support plate.

[0015] Preferably, the front end of the air permeability meter is further provided with a display screen; and / or the top of the air permeability meter is provided with a printer.

[0016] The present invention provides a highly integrated fully automatic air permeability tester that can quickly and accurately measure the air permeability of insulating paper, paper tube paper, paper board, etc. The air permeability tester of this design clamps the sample by moving the lower pressure plate upward, and the lower pressure plate has a short distance. The present invention uses a film and air pressure to raise the lower pressure plate. This design can not only quickly clamp the sample, but also maximize space savings, and has a simple structure and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is one of the structural diagrams of the air permeability tester.

[0018] Figure 2 This is the second structural diagram of the air permeability tester.

[0019] Figure 3 This is the third structural diagram of the air permeability tester.

[0020] Figure 4 It is a structural diagram of the lifting mechanism.

[0021] Figure 5 It is a top view of the lifting mechanism.

[0022] Figure 6 for Figure 5 AA section of the lifting mechanism.

[0023] Figure 7 It is a structural diagram of the lower pressure plate.

[0024] Figure 8 for Figure 7 CC cross-section of the lower platen.

[0025] Figure 9 It is a structural diagram of the upper pressure plate. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0028] A fully automatic air permeability tester, such as Figure 1-3 The air permeability tester consists of a pressing mechanism, a lifting mechanism, an air source mechanism, a flow monitoring mechanism, and a supporting body. The supporting body is the frame of the air permeability tester, used to mount and secure the various components; the air source mechanism is primarily responsible for air processing and flow regulation; the flow monitoring mechanism is primarily responsible for detecting air flow data; the pressing mechanism and the lifting mechanism work together to secure the sample and assist in air permeability measurement.

[0029] The supporting body includes a housing 11 , a supporting plate 12 and a base 13 . The supporting plate 12 is detachably fixed on the base 13 .

[0030] The air source mechanism includes an air processing element 41, a fluid control valve 42, and a precision pressure regulating valve 43. In this embodiment, the air processing element 41 is fixed to the exterior of the rear cover of the housing 11 and filters the air, removing oil and water from the air and regulating the air flow. The fluid control valve 42 and the precision pressure regulating valve 43 are fixed to the interior of the rear cover of the housing 11, with the knob of the precision pressure regulating valve 43 located on the exterior of the rear cover to facilitate precise air flow adjustment. The air processing element 41 is connected to the fluid control valve 42, which is in turn connected to the precision pressure regulating valve 43 via a pipe. The precision pressure regulating valve 43 is also connected to a flow sensor 51 via a pipe. The flow sensor 51 is connected to the support plate 12 via a pipe. A pressure sensor is also located on the support plate 12 (the pipes are not shown in the figure).

[0031] The flow monitoring mechanism includes a flow sensor 51 and a pressure sensor. The flow sensor 51 is fixed inside the rear cover of the housing 11, and the pressure sensor (not shown) is fixed in the hole of the support plate 12 leading to the upper pressure plate 21, respectively measuring the air flow and the pressure difference on both sides of the sample.

[0032] The upper pressing mechanism includes an upper pressing plate 21, which is detachably fixed to the bottom of the support plate 12. Figure 9 As shown, the upper platen 21 is provided with a hole for air to pass through, and the hole can be arranged at the center of the upper platen 21. The support plate 12 is provided with a hole opposite thereto, and a pressure sensor and a pipe for air circulation are arranged on the hole.

[0033] The lifting mechanism includes a lower pressure plate 31, a pressure ring 32, a lower pressure plate seat 33, an air guide channel 34, and an elastic film 35. The lower pressure plate seat 33 is detachably arranged on the base 13. Figure 5 、 6 As shown, a groove is provided inside the lower pressure plate seat 33, and a circle of islands is provided at the bottom of the groove. The elastic film 35 can be detachably placed on the circle to form an air guide chamber 36 with the bottom of the groove; the pressure ring 32 is a hollow cylinder, and the pressure ring 32 can be detachably placed on the elastic film 35 to suppress the elastic film 35 to prevent it from shifting; the elastic film 35 and the pressure ring 32 are fixed in the groove of the lower pressure plate seat 33 by bolts. The lower pressure plate 31 is placed in the hollow position of the pressure ring 32, facing the upper pressure plate 21, and a sealing ring is provided between the upper pressure plate 21 and the lower pressure plate 31. As shown Figure 4 、 6 As shown, the air guide channel 34 is provided below the groove of the lower pressure plate seat 33 and extends in the horizontal direction. One end of the air guide channel 34 is connected to the air guide chamber 36 , and the other end is connected to the outside of the lower pressure plate seat 33 .

[0034] like Figure 7 、 8 As shown, the lower platen 31 is provided with an exhaust hole 311 and an exhaust channel 312. The exhaust hole 311 runs through the upper surface of the lower platen 31 and is connected to the exhaust channel 312. The exhaust hole 311 is set at the center of the lower platen 31, corresponding to the hole in the center of the upper platen 21. The exhaust channel 312 is set inside the lower platen 31 and extends horizontally. One end of the exhaust channel 312 is connected to the exhaust hole 311, and the other end is connected to the outside of the side of the lower platen 31. A U-shaped groove is excavated along the side wall of the lower platen 31 toward the upper surface of the lower platen 31. One end of the U-shaped groove is connected to the exhaust channel 312, and the other end is connected to the outside of the upper surface of the lower platen 31. This structure allows air to pass from the exhaust hole 311 to the outside of the upper pressure mechanism. The upper surface of the lower platen 31 is also provided with concentric grooves, and the top of the cross-section of the lower platen 31 is serrated. In addition, the upper surface of the lower platen 31 is also provided with a strip groove, which passes through the center of the circle.

[0035] like Figure 2As shown, a push rod 131 can also be provided at the rear of the base 13. The end of the push rod 131 near the lower pressure plate seat 33 is the front end, and a connecting hole is provided in the middle of the front end. The connecting hole can be connected to a ventilation pipe (not shown). The air guide channel 34 can extend a portion of the outer portion of the lower pressure plate seat 33 to form a connecting component. The outer diameter of this connecting component should be smaller than the inner diameter of the connecting hole on the push rod 131. The lower pressure plate seat 33 can be detachably connected to the push rod 131 through the air guide channel 34 connecting component and the connecting hole on the push rod 131. When the lower pressure plate seat 33 is connected to the push rod 131 and placed on the base 13, a certain gap is left between the rear end of the push rod 131 and the back cover of the housing 11. After the sample test is completed, the rear end of the push rod 131 can be pushed forward to make it tightly fit between the rear end of the push rod 131 and the back cover of the housing 11. At this time, the lower pressure plate seat 33 is removed from the base 13.

[0036] A cover 6 is provided around the upper platen 21, and the cover 6 is fixed to the bottom of the support plate 12 to form a fence on the front side and the left and right sides of the upper platen 21. The cover 6 can be a glass cover.

[0037] The front end of the air permeability tester is also provided with a display screen 7 for operating the instrument.

[0038] A printer 8 is provided on the top of the air permeability tester. The main body of the printer 8 is located inside the casing 11, and part of the printer 8 is located outside the casing 11. The printer 8 can print the test results.

[0039] The following is an example of experimental data designed for a fully automatic air permeability tester in order to evaluate its performance and support the description of the effects of the invention: 1. Experimental Purpose Test the air permeability of different types of samples.

[0040] 2. Experimental parameters Sample specifications: A4 printing paper: 80g / m² thick, φ6cm round specimen, flat and without creases; Coated paper: thickness 157g / m², φ6cm circular specimen, uniform coating surface, no holes; Kraft paper: thickness 200g / m², φ6cm circular sample, taken from the flat part of the carton; Qualitative filter paper: φ6cm circular sample.

[0041] 3. Test conditions: Test air pressure: 20.0 kPa; Gas source pressure: 0.2MPa; Number of tests: 5 times; Test environment: (20±10)℃, ≤80%RH.

[0042] 4. Experimental data The test results of all samples were within the measurement range of the instrument (≤100 μm / (Pa・s)), with a standard deviation of less than 5%, meeting the repeatability requirements.

[0043] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable professionals in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully automatic air permeability tester, characterized in that: The air permeability measuring instrument comprises an upper pressure mechanism, a lifting mechanism, an air source mechanism, a flow monitoring mechanism and a supporting body; the supporting body comprises a housing (11), a supporting plate (12) and a base (13), and the supporting plate (12) is detachably fixed above the base (13); the air source mechanism is arranged on the housing (11) and the supporting plate (12), and comprises an air source processing element (41), a fluid control valve (42), and a precision pressure regulating valve (43); the flow monitoring mechanism comprises a flow sensor (51) and a pressure sensor; the upper pressure mechanism is detachably fixed to the bottom of the supporting plate (12), and the lifting mechanism is detachably arranged inside the base (13), and the upper surface of the lifting mechanism is flush with the upper surface of the base (13); The upper pressing mechanism comprises an upper pressing plate (21), and the upper pressing plate (21) is detachably fixed to the bottom of the support plate (12); The lifting mechanism comprises a lower pressure plate (31), a pressure ring (32), a lower pressure plate seat (33), an air guide channel (34), and an elastic film (35); a groove is provided inside the lower pressure plate seat (33), a ring island is provided at the bottom of the groove, and the elastic film (35) is detachably placed on the ring island to form an air guide chamber (36) with the bottom of the groove; the pressure ring (32) is a hollow cylinder, the pressure ring (32) is detachably placed on the elastic film (35), and the lower pressure plate (31) is placed in the hollow position of the pressure ring (32) and is directly opposite to the upper pressure plate (21); the air guide channel (34) is provided below the groove of the lower pressure plate seat (33), one end of which is connected to the air guide chamber (36), and the other end of which is connected to the outside of the lower pressure plate seat (33).

2. A fully automatic air permeability tester according to claim 1, characterized in that: A push rod (131) is further provided at the rear of the base (13), and the front end of the push rod (131) is detachably connected to the air guide channel (34).

3. A fully automatic air permeability tester according to claim 2, characterized in that: The air guide channel (34) is provided with a connecting component extending outward, and a connecting hole is provided in the middle of the front end of the push rod (131), and the connecting component can be connected to the connecting hole by mortise and tenon.

4. The fully automatic air permeability tester according to claim 1, characterized in that: The lower pressure disc seat (33), the elastic film (35), and the pressure ring (32) are fixed by bolt connection.

5. The fully automatic air permeability tester according to claim 1, characterized in that: The lower pressure plate (31) is provided with an exhaust hole (311) and an exhaust channel (312). The exhaust hole (311) passes through the upper surface of the lower pressure plate (31) and is connected to the exhaust channel (312). The exhaust channel (312) is provided inside the lower pressure plate (31) and extends in a horizontal direction to be connected to the outside of the lower pressure plate (31).

6. The fully automatic air permeability tester according to claim 1, characterized in that: The upper surface of the lower pressing plate (31) is provided with concentric circular grooves, and the top of the cross section of the lower pressing plate (31) is serrated.

7. The fully automatic air permeability tester according to claim 1, characterized in that: A sealing ring is provided between the upper pressing plate (21) and the lower pressing plate (31).

8. The fully automatic air permeability tester according to claim 1, characterized in that: The air source processing element (41) is connected to the fluid control valve (42), the fluid control valve (42) is connected to the precision pressure regulating valve (43) via a pipeline, the precision pressure regulating valve (43) is connected to the flow sensor (51) via a pipeline, the flow sensor (51) is connected to the support plate (12) via a pipeline, and the pressure sensor is arranged on the support plate (12).

9. The fully automatic air permeability tester according to claim 1, characterized in that: A cover shell (6) is provided around the upper pressure plate (21), and the cover shell (6) is fixed to the bottom of the support plate (12).

10. The fully automatic air permeability tester according to claim 1, characterized in that: The front end of the air permeability meter is also provided with a display screen (7); and / or the top of the air permeability meter is provided with a printer (8).

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