A BOPP membrane permeability testing device

Abstract

The present invention discloses a B0PP membrane permeability testing device, comprising a fixed base, a support frame is arranged at the top of the fixed base, a fixed cover is placed at the top of the fixed base, through holes are opened at equal intervals on the side of the fixed cover, a film is placed at the top of the through hole, a fixed cover is placed at the top of the through hole, a clamping assembly is arranged at the top of the fixed base, and a sliding limit assembly is fixedly installed at the top of the fixed side plate. The present invention arranges a clamping assembly and a sliding limit assembly as well as a fixed cover and a fixed cover, and utilizes the mutual cooperation of the several, firstly operates the telescopic rod to drive the clamping block and the fixed cylinder and the limiting ring below it to move against the outer side of the fixed cover, so that the limiting ring on its side can compress and squeeze the film placed above the fixed cover, thereby improving the sealing between the edge of the film and the fitting edge above the fixed cover, and ensuring the connection strength between the two after compression and fixation.

Description

Technical Field

[0001] The present invention relates to the field of BOPP membrane detection technology, and more specifically, the present invention is a BOPP membrane permeability detection device. Background Art

[0002] Biaxially oriented polypropylene film (BOPP) is generally a multi-layer co-extruded film, which is made by co-extruding polypropylene particles into sheets and then stretching them in the longitudinal and transverse directions. Due to the orientation of the stretched molecules, the film has good physical stability, mechanical strength, and air tightness, high transparency and gloss, and is tough and wear-resistant. It is a widely used printing film. The general thickness is 20-40μm, and the most widely used is 20μm. Biaxially oriented polypropylene film is mainly used as the outer film of the composite film and is suitable for holding dry food. Biaxially oriented polypropylene film has the advantages of light weight, non-toxicity, odorlessness, moisture resistance, high mechanical strength, good dimensional stability, good printing performance, good transparency, etc. Its good physical properties and low production cost make it an ideal choice for the outer layer of composite materials. Therefore, it is necessary to test the barrier properties of PP and PE when designing composite material structures. The test process is carried out under a temperature environment of room temperature to 45°C. Mainly combined with the stability of temperature control, a large number of tests were carried out at 4 temperature points of 30°C, 35°C, 40°C, and 45°C. The number of effective tests at each temperature point was more than 3 times. The data fitting function of the VAC-V1 gas permeameter was used to obtain the oxygen permeability data of polypropylene materials at each temperature point between -120°C and 350°C (i.e., 153K to 623K). This temperature range basically covers the actual temperature range of use, so it is very It has reference significance. The establishment of the database can bring great convenience to the relevant personnel in the production, processing and use of PP membranes. The prior art patent with publication number: CN110186834B provides a sealant permeability detection device for reverse osmosis membranes, including a detection box, the detection box includes a box body and a cover body sealed on the top opening of the box body; a carrier plate for placing the reverse osmosis membrane is provided in the box body, the carrier plate is provided with a through hole, the carrier plate divides the interior of the detection box into an upper pressure chamber and a lower characterization chamber for characterizing the detection results, a pressing plate is placed on the top of the carrying plate, the pressing plate and the carrying plate are used to clamp and fix the reverse osmosis membrane, and a hollow hole is provided in the middle of the pressing plate. The hollow area corresponds to the through hole in the vertical direction; the top of the cover body is provided with an air inlet interface, the outer side wall of the box body is provided with a water inlet interface and a measuring tube, the water inlet interface is connected with the characterization cavity, the measuring tube is vertically arranged and the bottom is connected with the characterization cavity, the measuring tube is transparent and has an opening at the top, and the tube wall of the measuring tube is also marked with scale lines for convenient reading. The detection device in the invention performs pressure simulation through the pressure cavity and performs specific permeability characterization through the characterization cavity, thereby clearly showing the permeability of the sealant to the reverse osmosis membrane, which is instructive for improving the sealing of the reverse osmosis membrane filter element and helps to improve the water filtration function of the permeable membrane filter element.

[0003] However, it still has some shortcomings in actual use. For example, when the current biaxially oriented polypropylene film is subjected to the barrier test, there is a certain gap between the outermost edge of the material and the fixed structure of the test device, resulting in some gas escaping from the outer edge of the film during the oxygen permeability barrier test, which leads to inaccurate test results and affects the accuracy of the equipment. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a B0PP membrane permeability performance testing device, which provides a clamping component and a sliding limit component as well as a fixed cover and a fixed cover, and utilizes the mutual cooperation of the several components. First, the operator inputs the gas into the interior of the fixed cover through the delivery pipe. At this time, the gas passes through the interior of the film and is delivered to the interior of the fixed cover, and is finally discharged through the through hole on the outside of the fixed cover. At this time, the barrier performance of the film can be tested by the existing instrument during the oxygen permeation process of the film to test the oxygen permeability data of the film. At the same time, the telescopic rod can be manipulated to drive the clamping block, the fixed cylinder and the limiting ring below it to move along the outside of the fixed cover, thereby ensuring that the inner diameter of the limiting ring and the outer diameter of the fixed cover are adapted to each other, so that the limiting ring on its side can compress and squeeze the film placed above the fixed cover, so that the corners of the film are turned inward and attached to the outer surface of the fixed cover, thereby improving the sealing between the edge of the film and the fitting edge above the fixed cover, and To ensure the connection strength of the two after compression and fixation, a clamping component is set, and a limiting groove is opened at the bottom end of the movable plate to make it match the matching arc-shaped mouth on the surface of the clamping block below, so that the fixed cylinder is clamped and fixed, and the limiting ring at one end of the fixed cylinder is synchronously limited and fixed as a whole; by setting a sliding limiting plate, an arc-shaped groove, a locking ring and a limiting top plate, and utilizing the mutual cooperation of the several, an arc-shaped groove is opened at the top end of the sliding limiting plate, so that it can be embedded in the arc-shaped groove through the locking ring, and then the two side-by-side sliding limiting plates are limited and locked, thereby improving its stability during work, and one end of the sliding limiting plate is extended out of the inner end of the fixed slide seat and extends to the top of the fixed cover, so that the top of the fixed cover can be limited and locked in the vertical direction, further improving the practical effect of the equipment, and ensuring the firmness of the three structures of the fixed cover, the film and the fixed cover, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a B0PP membrane permeability testing device, comprising a fixed base, a support frame is arranged at the top of the fixed base, a fixed cover is placed at the top of the fixed base, through holes are opened at equal intervals on the side of the fixed cover, a film is placed at the top of the through hole, a fixed cover is placed at the top of the through hole, a conveying pipe is connected to one end of the fixed cover, a pressing assembly is arranged at the top of the fixed base, a fixed side plate is installed at the top of the fixed base, and a sliding limit assembly is fixedly installed at the top of the fixed side plate;

[0006] The clamping assembly includes a movable plate, and rack side plates are respectively provided at the left and right ends of the movable plate, a telescopic rod is fixedly installed on the top of the movable plate, a limiting groove is provided at the bottom end of the movable plate, and a clamping block is detachably installed at the bottom end of the limiting groove, a threaded through hole is provided inside the clamping block, and a fixing bolt is connected to the internal thread of the threaded through hole, and an adapting arc-shaped opening is provided on the side of the clamping block close to the movable plate, a fixed cylinder is embedded in the limiting groove, and a limiting ring is inlaid on one end of the fixed cylinder.

[0007] In a preferred embodiment, one end of the fixing bolt passes through the interior of the threaded through hole and is connected to the internal thread of the movable plate, and the surface of the fixing bolt is evenly coated with a layer of lubricating grease.

[0008] In a preferred embodiment, the side of the rack side plate is meshedly connected with an auxiliary gear, the side of the auxiliary gear is inlaid with a fixed shaft 1, the side of the auxiliary gear is rotatably sleeved with a supporting side frame, and the side of the supporting side frame is fixedly connected with a fixed base.

[0009] In a preferred embodiment, a fixing spring is inlaid and installed on the top of the fixed base, a limiting plate is inlaid and installed on the top of the fixing spring, an arc-shaped recess is fixedly connected to the top of the limiting plate, an adapter plate is symmetrically inlaid and installed on the side of the limiting plate, and one side surface of the adapter plate is in contact with the surface of the fixed base.

[0010] In a preferred embodiment, the sliding limit assembly includes a fixed slide, a limit top plate is embedded and installed on the top of the fixed slide, a sliding limit plate is embedded and connected inside the fixed slide, and an arc groove is formed on the top of the sliding limit plate.

[0011] In a preferred embodiment, a locking ring is detachably embedded in the interior of the arc-shaped groove, and the surface of the locking ring is set to be a smooth surface.

[0012] In a preferred embodiment, the bottom end surface of the sliding limit plate is in close contact with the top end of the fixed cover, and there is an interference fit between the two.

[0013] In a preferred embodiment, the side surface of the limiting ring is in tight contact with the outer side of the fixed cover, and the shape of the limiting ring is adapted to the outer shape of the through hole. The cross-section of the limiting ring is circular, and the inner diameter of the limiting ring is adapted to the outer diameter of the fixed cover.

[0014] In a preferred embodiment, one end of the sliding limit plate extends out of an inner end of the fixed slide seat and extends to just above the fixed cover, and a layer of lubricating oil is evenly coated on the bottom end of the sliding limit plate.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention sets a clamping component and a sliding limit component as well as a fixed cover and a fixed cover, and utilizes the mutual cooperation of the several components. First, the operator inputs the gas into the interior of the fixed cover through the conveying pipe. At this time, the gas passes through the interior of the film and is conveyed to the interior of the fixed cover, and is finally discharged through the through hole on the outside of the fixed cover. At this time, the barrier performance of the film can be tested by the existing instrument during the oxygen permeation process of the film to test the oxygen permeability data of the film. At the same time, the telescopic rod can be manipulated to drive the clamping block, the fixed cylinder and the limiting ring below it to move along the outside of the fixed cover, so as to ensure that the inner diameter of the limiting ring and the outer diameter of the fixed cover are mutually adapted, so that the limiting ring on its side can compress and squeeze the film placed above the fixed cover, so that the corners of the film are turned inward and attached to the outer surface of the fixed cover, thereby improving the sealing between the edge of the film and the upper fitting edge of the fixed cover, and ensuring the connection strength between the two after compression and fixation, and further ensuring the accuracy of the experimental data;

[0017] 2. The present invention sets a clamping assembly and uses the bottom end of the movable plate to open a limiting groove, so that it is matched with the matching arc-shaped opening on the surface of the clamping block below, so as to clamp and fix the fixed cylinder, and synchronously limit and fix the limiting ring at one end of the fixed cylinder as a whole;

[0018] 3. The present invention sets a sliding limit plate, an arc-shaped groove, a locking ring and a limit top plate, and utilizes the mutual cooperation of the several members. The top end of the sliding limit plate is provided with an arc-shaped groove, so that it can be embedded in the arc-shaped groove through the locking ring, and then the two side-by-side sliding limit plates are limited and locked, thereby improving their stability during work, and one end of the sliding limit plate is extended out of the inner end of the fixed slide seat and extends to the top of the fixed cover, so that the top of the fixed cover can be limited and locked in the vertical direction, further improving the practical effect of the equipment and ensuring the firmness of the three structures of the fixed cover, the film and the fixed cover.

[0019] 4. The present invention sets a wedge-shaped slider, a linkage inclined plate and an adaptor roller, so that when the sliding limit plate slides and moves to the top of the fixed cover to fit and contact with it, the adaptor roller can be squeezed as a whole through the top of the fixed cover, thereby synchronously squeezing the wedge-shaped slider and the linkage inclined plate above through the adaptor roller, thereby compressing and squeezing the adaptor spring and the linkage spring on one side of the two structures, and then shrinking and squeezing them toward one side under the action of the adaptor roller. At this time, the first linkage plate and the second linkage plate on one side of the wedge-shaped slider can synchronously use their own rotational limiting form to limit the fixed axis 2 on one side of the adaptor roller through the arc-shaped groove on one side of the second linkage plate, further ensuring the fixing effect of the overall structure, thereby further improving the fitting force and sealing degree between the fixed cover, the fixed cover and the film, increasing the degree of coordination between the structures, and ensuring the accuracy of the final experimental data of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the fixed cover and film structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0024] Figure 5 It is a schematic diagram of a partial three-dimensional assembly structure of a pressing component of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional assembly structure of the clamping assembly of the present invention;

[0026] Figure 7 It is a schematic diagram of the overall structure of the clamping assembly of the present invention;

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the sliding limit plate of the present invention;

[0028] Fig. 9 It is a schematic diagram of the three-dimensional assembly structure of the sliding limit plate of the present invention;

[0029] Fig.10 It is a schematic diagram of the overall internal structure of the bottom end of the sliding limiting plate of the present invention.

[0030] The accompanying drawings are marked as follows: 1, fixed base; 2, support frame; 3, fixed cover; 4, through hole; 5, film; 6, fixed cover; 7, conveying pipe; 8, clamping assembly; 9, fixed side plate; 10, sliding limit assembly; 81, moving plate; 82, rack side plate; 83, telescopic rod; 84, limit groove; 85, clamping block; 86, threaded through hole; 87, fixing bolt; 88, adapter arc mouth; 89, fixed cylinder; 810, limiting ring; 811, auxiliary gear; 812, fixed shaft 1; 813, supporting side frame; 814, fixed base; 815, fixed spring; 816, Limiting plate; 817, arc-shaped recess; 818, adapter plate; 101, fixed slide seat; 102, limiting top plate; 103, sliding limiting plate; 104, arc-shaped groove; 105, locking ring; 11, adapter spring; 12, wedge-shaped slider; 13, first linkage plate; 14, second linkage plate; 15, fixed swivel; 16, adapter hole; 17, arc-shaped notch; 18, adapter roller; 19, fixed shaft two; 20, linkage inclined plate; 21, linkage spring; 22, arc-shaped toggle plate; 23, flexible connecting bracket; 24, embedded groove; 25, spherical protrusion; 26, accommodating inner cavity. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As attached Figure 1 To Attachment Figure 7 A B0PP membrane permeability testing device shown in the figure comprises a fixed base 1, a support frame 2 is arranged at the top of the fixed base 1, a fixed cover 3 is placed at the top of the fixed base 1, through holes 4 are equidistantly opened on the side of the fixed cover 3, a film 5 is placed at the top of the through hole 4, a fixed cover 6 is placed at the top of the through hole 4, a conveying pipe 7 is arranged at one end of the fixed cover 6, a pressing assembly 8 is arranged at the top of the fixed base 1, a fixed side plate 9 is installed at the top of the fixed base 1, and a sliding limit assembly 10 is fixedly installed at the top of the fixed side plate 9;

[0033] The clamping assembly 8 includes a movable plate 81, and rack side plates 82 are respectively provided at the left and right ends of the movable plate 81. A telescopic rod 83 is fixedly installed on the top of the movable plate 81. A limiting groove 84 is provided at the bottom end of the movable plate 81. A clamping block 85 is detachably installed at the bottom end of the limiting groove 84. A threaded through hole 86 is provided inside the clamping block 85. The internal thread of the threaded through hole 86 is connected with a fixing bolt 87. An adapting arc-shaped opening 88 is provided on the side of the clamping block 85 close to the movable plate 81. A fixing cylinder 89 is embedded in the limiting groove 84, and a limiting ring 810 is embedded at one end of the fixing cylinder 89.

[0034] One end of the fixing bolt 87 passes through the interior of the threaded through hole 86 and is connected to the internal thread of the movable plate 81. The surface of the fixing bolt 87 is evenly coated with a layer of lubricating grease. The side of the rack side plate 82 is meshedly connected with an auxiliary gear 811. The side of the auxiliary gear 811 is inlaid with a fixed shaft 812. The side of the auxiliary gear 811 is rotatably sleeved with a supporting side frame 813. The side of the supporting side frame 813 is fixedly connected with a fixed base 814. The top of the fixed base 814 is inlaid with a fixing spring 815. The top of the fixing spring 815 is inlaid with a limiting plate 816. The top of the limiting plate 816 It is fixedly connected with an arc-shaped recess 817, and the side surface of the limit plate 816 is symmetrically inlaid with an adapter plate 818. One side surface of the adapter plate 818 is in contact with the surface of the fixed base 814 in an attached manner. The interior of the arc-shaped recess 104 is detachably inlaid with a locking ring 105, and the surface of the locking ring 105 is set to a smooth surface. The bottom end surface of the sliding limit plate 103 is in contact with the top end of the fixed cover 6, and there is an interference fit between the two. One end of the sliding limit plate 103 extends out of the inner end of the fixed slide 101 and extends to the top of the fixed cover 6. The bottom end of the sliding limit plate 103 is evenly coated with a layer of lubricating oil.

[0035] The bottom end of the sliding limit plate 103 is provided with an accommodating inner cavity 26, an adapting spring 11 is embedded and installed on one side of the inner cavity 26, a wedge-shaped slider 12 is embedded and installed on one end of the adapting spring 11, a first linkage plate 13 is rotatably mounted on the side of the wedge-shaped slider 12, a second linkage plate 14 is rotatably mounted on one end of the first linkage plate 13, a fixed rotating port 15 is provided at the connection between the first linkage plate 13 and the second linkage plate 14, and a fixed rotating shaft is rotatably arranged inside the fixed rotating port 15, an adapting hole 16 is provided on the other end of the first linkage plate 13, and an arc-shaped notch 17 is provided on one end of the second linkage plate 14 away from the first linkage plate 13, and the accommodating inner cavity. The inner wall surface of 26 is equidistantly rotated and provided with adapting rollers 18 in sequence, and a fixed shaft 2 19 is fixedly installed inside the adapting roller 18. One end of the wedge-shaped slider 12 is inlaid with a linkage spring 21, and the other end of the linkage spring 21 is inlaid with a linkage inclined plate 20. The side of the adapting roller 18 is fitted with an arc-shaped toggle plate 22, and one end of the arc-shaped toggle plate 22 is inlaid with a flexible connection bracket 23. An embedding groove 24 is provided on the side of the arc-shaped toggle plate 22, and a spherical protrusion 25 is inlaid in the middle of the flexible connection bracket 23. The overall material of the flexible connection bracket 23 and the spherical protrusion 25 are both made of rubber elastic material. The wedge-shaped slider 12 and the linkage inclined plate 20 are both inclined structures as a whole, and the inclined surface faces one end of the adapting roller 18, and the surfaces of the wedge-shaped slider 12 and the linkage inclined plate 20 are both set to smooth surfaces.

[0036] By utilizing the above-mentioned wedge-shaped slider 12, linkage inclined plate 20 and adapting roller 18, when the sliding limit plate 103 slides and moves to the top of the fixed cover 6 to fit and contact with it, the adapting roller 18 can be squeezed as a whole through the upper part of the fixed cover 6, thereby synchronously squeezing the wedge-shaped slider 12 and the linkage inclined plate 20 above through the adapting roller 18, thereby compressing and squeezing the adapting spring 11 and the linkage spring 21 on one side of the two structures, and then shrinking and squeezing to one side under the action of the adapting roller 18. At this time, the first linkage plate 13 and the second linkage plate 14 on one side of the wedge-shaped slider 12 can synchronously use their own rotational restriction form to limit the fixed axis 2 19 on one side of the adapting roller 18 as a whole through the arc-shaped groove 17 on one side of the second linkage plate 14, further ensuring the fixing effect of the overall structure, thereby further improving the fitting force and sealing degree between the fixed cover 6, the fixed cover 3 and the film 5, and increasing the degree of fit between the structures.

[0037] For details, please refer to the attached manual Figure 2 and 4The sliding limit assembly 10 includes a fixed slide 101, a limit top plate 102 is embedded on the top of the fixed slide 101, a sliding limit plate 103 is embedded inside the fixed slide 101, and an arc groove 104 is opened on the top of the sliding limit plate 103.

[0038] The specific implementation method is as follows: an arc-shaped groove 104 is opened at the top of the sliding limit plate 103, so that it can be embedded in the arc-shaped groove 104 through a locking ring 105, and then the two side-by-side sliding limit plates 103 are limited and locked, thereby improving their stability during work. At the same time, a limiting groove 84 is opened at the bottom end of the movable plate 81 to make it compatible with the matching arc-shaped mouth 88 on the surface of the clamping block 85 below, so that the fixed cylinder 89 is clamped and fixed, and the limiting ring 810 at one end of the fixed cylinder 89 is synchronously limited and fixed as a whole.

[0039] For details, please refer to the attached manual Figure 6-7 The side surface of the limiting ring 810 is in close contact with the outer side of the fixed cover 6, and the shape of the limiting ring 810 is adapted to the outer shape of the through hole 4. The cross-section of the limiting ring 810 is circular, and the inner diameter of the limiting ring 810 is adapted to the outer diameter of the fixed cover 3.

[0040] The specific implementation method is: the inner diameter of the limiting ring 810 is adapted to the outer diameter of the fixed cover 3, so that the limiting ring 810 on the side can compress and squeeze the film 5 placed above the fixed cover 3, so that the edges and corners of the film 5 are turned inward and attached to the outer surface of the fixed cover 3, thereby improving the sealing between the edge of the film 5 and the fitting edge above the fixed cover 3, and ensuring the connection strength between the two after compression and fixation.

[0041] Working principle of the present invention:

[0042] Step 1: First, the operator assembles the various components of the device normally, and then starts the device normally.

[0043] Step 2: First, the operator inputs the gas into the interior of the fixed cover 6 through the delivery pipe 7. At this time, the gas passes through the interior of the film 5 and is delivered to the interior of the fixed cover 3, and is finally discharged through the through hole 4 on the outside of the fixed cover 3. At this time, the barrier performance of the film 5 can be tested by the existing instrument during the oxygen permeation process to test the oxygen permeability data of the film 5. At the same time, the telescopic rod 83 can be manipulated to drive the clamping block 85, the fixed cylinder 89 and the limiting ring 810 below it to move along the outside of the fixed cover 3, so as to ensure that the inner diameter of the limiting ring 810 and the outer diameter of the fixed cover 3 are mutually adapted, so that the limiting ring 810 on the side can compress and squeeze the film 5 placed above the fixed cover 3, so that the corners of the film 5 turn inward and adhere to the outer surface of the fixed cover 3, thereby improving the sealing between the edge of the film 5 and the upper fitting edge of the fixed cover 3, and ensuring the connection strength between the two after compression and fixation, further ensuring the accuracy of the experimental data, and improving the detection effect of the film 5. Finally, the device completes the oxygen permeability detection process of the film 5.

[0044] Step 3: First, the operator shuts down the device normally, then checks whether the fixation between the various components of the device is normal, and then replaces and repairs the aging and severely worn parts inside the device.

[0045] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0046] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0047] Finally: 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 protection scope of the present invention.

Claims

1. A BOPP membrane permeability testing device, comprising a fixed base (1), a support frame (2) is arranged at the top of the fixed base (1), a fixed cover (3) is placed at the top of the fixed base (1), through holes (4) are equidistantly opened on the side of the fixed cover (3), and a film (5) is placed at the top of the through hole (4), characterized in that: A fixed cover (6) is placed at the top of the through hole (4), one end of the fixed cover (6) is connected to a delivery pipe (7), a clamping assembly (8) is provided at the top of the fixed base (1), a fixed side plate (9) is installed at the top of the fixed base (1), and a sliding limit assembly (10) is fixedly installed at the top of the fixed side plate (9); The clamping assembly (8) comprises a movable plate (81), the left and right ends of the movable plate (81) are respectively provided with rack side plates (82), a telescopic rod (83) is fixedly installed at the top of the movable plate (81), a limiting groove (84) is provided at the bottom end of the movable plate (81), a clamping block (85) is detachably installed at the bottom end of the limiting groove (84), a threaded through hole (86) is provided inside the clamping block (85), the internal thread of the threaded through hole (86) is connected with a fixing bolt (87), an adapting arc-shaped opening (88) is provided on one side of the clamping block (85) close to the movable plate (81), a fixing cylinder (89) is embedded and connected inside the limiting groove (84), and a limiting ring (810) is embedded and connected at one end of the fixing cylinder (89).

2. A BOPP membrane permeability detection device according to claim 1, characterized in that: One end of the fixing bolt (87) passes through the interior of the threaded through hole (86) and is connected to the internal thread of the moving plate (81), and the surface of the fixing bolt (87) is evenly coated with a layer of lubricating grease.

3. A BOPP membrane permeability detection device according to claim 1, characterized in that: The side of the rack side plate (82) is meshedly connected with an auxiliary gear (811), the side of the auxiliary gear (811) is inlaid with a fixed shaft (812), the side of the auxiliary gear (811) is rotatably sleeved with a supporting side frame (813), and the side of the supporting side frame (813) is fixedly connected with a fixed base (814).

4. A BOPP membrane permeability detection device according to claim 3, characterized in that: A fixing spring (815) is inlaid and installed on the top of the fixing base (814), a limiting plate (816) is inlaid and installed on the top of the fixing spring (815), an arc-shaped notch (817) is fixedly connected to the top of the limiting plate (816), an adapter plate (818) is symmetrically inlaid and installed on the side of the limiting plate (816), and one side surface of the adapter plate (818) is in contact with the surface of the fixing base (814) in an adhesive manner.

5. A BOPP membrane permeability detection device according to claim 1, characterized in that: The sliding limit assembly (10) comprises a fixed slide seat (101), a limit top plate (102) is inlaid on the top of the fixed slide seat (101), a sliding limit plate (103) is inlaid inside the fixed slide seat (101), and an arc-shaped groove (104) is formed on the top of the sliding limit plate (103).

6. A BOPP membrane permeability detection device according to claim 5, characterized in that: A locking ring (105) is detachably embedded in the interior of the arc-shaped groove (104), and the surface of the locking ring (105) is set to be a smooth surface.

7. A BOPP membrane permeability detection device according to claim 6, characterized in that: The bottom end surface of the sliding limit plate (103) is in close contact with the top end of the fixed cover (6), and there is an interference fit between the two.

8. A BOPP membrane permeability detection device according to claim 1, characterized in that: The side surface of the limiting ring (810) is in close contact with the outer side of the fixing cover (6), and the shape of the limiting ring (810) is compatible with the outer shape of the through hole (4). The cross section of the limiting ring (810) is circular, and the inner diameter of the limiting ring (810) is compatible with the outer diameter of the fixing cover (3).

9. A BOPP membrane permeability detection device according to claim 5, characterized in that: One end of the sliding limit plate (103) extends out of an inner end of the fixed slide seat (101) and extends to the top of the fixed cover (6). The bottom end of the sliding limit plate (103) is evenly coated with a layer of lubricating oil.

10. A BOPP membrane permeability detection device according to claim 9, characterized in that: The bottom end of the sliding limit plate (103) is provided with an accommodating inner cavity (26), an adapting spring (11) is embedded and installed on one side of the inner cavity (26), a wedge-shaped slider (12) is embedded and installed on one end of the adapting spring (11), a first linkage plate (13) is rotatably mounted on the side of the wedge-shaped slider (12), a second linkage plate (14) is rotatably mounted on one end of the first linkage plate (13), a fixed rotating opening (15) is provided at the connection between the first linkage plate (13) and the second linkage plate (14), and a fixed rotating shaft is rotatably arranged inside the fixed rotating opening (15), an adapting hole (16) is provided on the other end of the first linkage plate (13), an arc-shaped notch (17) is provided on the end of the second linkage plate (14) away from the first linkage plate (13), and adapting rollers (18) are rotatably arranged on the inner wall surface of the accommodating inner cavity (26) in sequence, and the adapting rollers (18) are equidistantly rotatably arranged on the inner wall surface of the accommodating inner cavity (26), and the adapting rollers (18) are rotatably arranged on the inner wall surface of the accommodating inner cavity (26). 8) is fixedly installed with a fixed shaft 2 (19) inside, one end of the wedge-shaped slider (12) is inlaid with a linkage spring (21), the other end of the linkage spring (21) is inlaid with a linkage inclined plate (20), the side of the adapting roller (18) is fitted with an arc-shaped toggle plate (22), one end of the arc-shaped toggle plate (22) is inlaid with a flexible connection bracket (23), the side of the arc-shaped toggle plate (22) is provided with an embedding groove (24), the middle part of the flexible connection bracket (23) is inlaid with a spherical protrusion (25), the whole material of the flexible connection bracket (23) and the spherical protrusion (25) are both made of rubber elastic material, the wedge-shaped slider (12) and the linkage inclined plate (20) are both inclined structures as a whole, and the inclined surface faces one end of the adapting roller (18), and the surfaces of the wedge-shaped slider (12) and the linkage inclined plate (20) are both set as smooth surfaces.

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