A foreign body detection device for BOPP film surface

Abstract

The present invention relates to the technical field of BOPP film surface detection devices, and specifically to a foreign body detection device for BOPP film surface, comprising a support frame, a support shell is fixedly installed on the upper end of the support frame, a roller for winding the film surface is rotatably installed on the inner end of the support shell, an irradiation lamp is fixedly installed on the inner left end of the support shell, a receiving panel is fixedly installed on the upper left end of the support frame, and the receiving panel is located directly below the irradiation lamp, a compression cylinder is installed on the inner side of the support shell, a dust removal surface shell is arranged on one side of the compression cylinder, and a removal device for removing impurities from the outer surface of the film is arranged at the inner end of the dust removal surface shell, when high-speed and high-pressure gas reaches the upper end of the movable plug, the movable plug is pushed downward, and flows to the bottom end of the jet pipe along the inner wall of the jet pipe, and then is ejected from the holes on the outer surface of the limit plate and sprayed on the outer surface of the film, causing it to oscillate, thereby realizing the shaking out of dust, and utilizing non-contact vibration to realize the shaking out of foreign bodies on the outer surface of the film.

Description

Technical Field

[0001] The invention relates to the technical field of BOPP film surface detection devices, in particular to a foreign matter detection device for BOPP film surface. Background Art

[0002] BOPP film refers to Biaxially Oriented Polypropylene Film, which is a plastic film made by extruding polypropylene raw materials into film and then biaxially stretching it. During the production process of this film, polypropylene is first melted and extruded into a film, and then biaxially stretched, that is, stretched in both horizontal and vertical directions, to make the film molecules more evenly and densely arranged, thereby improving the strength, transparency and flatness of the film.

[0003] After searching, it was found that the prior art publication number is CN 218974205 U, which discloses a foreign body detection device for BOPP film production, relates to the technical field of BOPP film production, and solves the problem that it is inconvenient for workers to adjust the height and use films of different thicknesses. The device comprises a mounting assembly; a supporting device and a clamping device are installed on the mounting assembly, and the clamping device is located above the supporting device; a collecting device, the collecting device is installed on the top of the mounting assembly, and a monitoring assembly is installed on the front side of the mounting assembly; the mounting assembly comprises: a bottom plate, two mounting holes are penetrated on the bottom plate; under the action of two springs, it is convenient to use BOPP film surfaces of different thicknesses, and the versatility is improved. Because the stopper is fixedly installed on the rear side of the inclined block B, and the inclined block B is fixedly installed on the left side of the clamping plate, the foreign matter on the top of the BOPP film surface moves forward under the action of the stopper and the inclined block B, which plays a better diversion role and avoids the blockage of foreign matter after cleaning.

[0004] Therefore, based on the above search and in combination with the existing technology, the above method, when cleaning foreign matter on the surface of the film, uses a block to remove foreign matter on the film surface. This method may directly cause damage to the film surface due to uneven force. Most of the foreign matter on the film surface is due to the static electricity of the film itself, which causes the foreign matter to adhere to the outer surface. At this time, the block scrapes the film surface while rubbing against it and generates static electricity again, so new foreign matter will adhere to the outer surface of the film. It is not very practical. For this reason, we propose a foreign matter detection device for BOPP film surface. Summary of the invention

[0005] The object of the present invention is to provide a device for detecting foreign matter on a BOPP film surface, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting foreign matter on a BOPP film surface, comprising a support frame, a support shell is fixedly installed on the upper end of the support frame, a roller for winding the film surface is rotatably installed on the inner end of the support shell, an irradiation lamp is fixedly installed on the inner left end of the support shell, a receiving panel is fixedly installed on the upper left end of the support frame, the receiving panel is located directly below the irradiation lamp, and the light emitted by the irradiation lamp irradiates the outer surface of the film and then projects to the upper end of the receiving panel, two compression cylinders for transition are fixedly installed on the inner right end of the support shell, and the compression cylinders are arranged on the inner side of the support shell in an up-and-down staggered manner, a dust removal surface shell is provided on the side where the two compression cylinders are close to each other, the dust removal surface shell is fixedly installed on the inner right end of the support shell, a mounting cover is detachably installed on the end of the compression cylinders that are away from each other, and the mounting covers are fixedly connected through a conducting pipe, a removal device for removing impurities from the outer surface of the film is provided on the inner end of the dust removal surface shell, and a rotating body is rotatably installed on the inner bottom end of the compression cylinder;

[0007] The removal device includes a dispersion pipe, which is fixedly installed on the inner upper end of the dust removal surface shell. The upper end of the dispersion pipe is fixedly connected to the bottom end of the compression cylinder through an air outlet pipe. A plurality of jet pipes are fixedly installed on the bottom end of the dispersion pipe. The plurality of jet pipes are arranged in a matrix, thereby achieving the ability to blow air to the film without dead angles.

[0008] As a further solution of the present invention, a movable plug is passed through the inner side of the jet pipe, and the bottom end of the movable plug is exposed on the outside of the jet pipe. A limit plate is fixedly installed on the bottom end of the movable plug, and a return spring is provided at the upper end of the limit plate. The return spring is clamped between the bottom end of the jet pipe and the upper end of the limit plate. Under the action of the contraction force of the return spring, the movable plug can always maintain an upward force.

[0009] As a further solution of the present invention, multiple sets of connecting rods are rotatably installed on the inner bottom end of the jet pipe, and an abutment ring is rotatably installed on the upper end of the connecting rod. The abutment ring is sleeved on the outer surface of the movable plug, and the movable plug is abutted by the abutment ring to prevent it from moving downward too far, thereby preventing the upper end of the movable plug from blocking the air outlet of the jet pipe again.

[0010] As a further solution of the present invention, a connecting column is fixedly installed on the inner bottom end of the compression cylinder, and the rotating body is rotatably sleeved on the outer surface of the connecting column, so that the rotating body can be fixed in one position and rotate.

[0011] As a further solution of the present invention, a plurality of blades are fixedly installed on the outer surface of the rotating body, a protrusion is fixedly installed on the bottom end of the rotating body, the protrusion is fitted with the inner bottom end of the compression cylinder, and a plurality of air ports are opened at the inner bottom end of the compression cylinder, the air ports connect the air outlet pipe and the inner cavity of the compression cylinder, so as to realize reasonable distribution of gas.

[0012] As a further solution of the present invention, the width of the protrusion is the same as the diameter of the air port. When the protrusion moves to the air port following the rotation of the rotating body, it blocks the air port, thereby achieving regular and intermittent blocking and conduction of the air port.

[0013] As a further solution of the present invention, a connecting pipe is fixedly installed on the outer surface of the compression cylinder, a strip air outlet is fixedly installed on the right end of the dust removal surface shell, and the other end of the connecting pipe is fixedly connected to the right end of the strip air outlet, and the gas flows into the connecting pipe and flows out from the strip air outlet.

[0014] As a further solution of the present invention, two mounting seats are fixedly installed on the inner right end of the support shell, and a eliminator for releasing and neutralizing static electricity is fixedly installed on one end of the two mounting seats close to each other to prevent the film from generating static electricity again.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The accumulation of dust and debris may affect the quality and performance of the film, resulting in uneven film surface or defects. When high-speed and high-pressure gas reaches the upper end of the movable plug, it will push the movable plug downward and flow along the inner wall of the jet tube to the bottom end of the jet tube, and then spray out from the holes on the outer surface of the limit plate and spray on the outer surface of the film, causing it to vibrate, thereby shaking out the dust. Non-contact vibration is used to shake out foreign matter on the outer surface of the film, thereby avoiding damage to the film and making it unusable.

[0017] 2. When dust appears on the surface of the film, the light from the irradiation lamp shines on the outer surface of the film. When the light encounters particles with a size close to its wavelength, scattering occurs, that is, the light is reflected or refracted by the particles, thereby forming the Tyndall effect, and finally forming a visible light path in a specific direction and scattering on the upper end of the receiving panel, so as to detect whether there is foreign matter on the outer surface of the film. The Tyndall effect is a highly sensitive detection method, even tiny foreign matter or small defects can be detected. At the same time, the detection of the Tyndall effect is a non-contact method, which does not require direct contact with the film surface, avoiding possible damage or interference to the film;

[0018] 3. The eliminator generates charged particles through radiation (such as ultraviolet rays) to neutralize static electricity, so that the static electricity on the outer surface of the film can be more fully eliminated, and static electricity on the outer surface of the film can be prevented from being generated again, causing foreign matter to adhere to the outer surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a foreign body detection device for BOPP film surface;

[0020] Figure 2 This is a schematic diagram of the internal structure of a device for detecting foreign matter on a BOPP film surface;

[0021] Figure 3 It is a schematic diagram of the structure of the compression cylinder and the dust removal shell;

[0022] Figure 4 It is a schematic diagram of the internal structure of the compression cylinder and the dust removal shell;

[0023] Figure 5 It is a schematic diagram of the internal structure of the compression cylinder;

[0024] Figure 6 It is a schematic diagram of the structure of the dispersion pipe and the jet pipe;

[0025] Figure 7 Schematic diagram of the internal structure of the dispersion tube;

[0026] Figure 8 Schematic diagram of the internal structure of the jet pipe;

[0027] Fig. 9 This is the disassembly diagram of the jet pipe;

[0028] Fig.10 It is the structural schematic diagram of the electric appliance;

[0029] Fig.11 This is the state diagram of the film when it is subjected to air force.

[0030] In the figure: 1, support frame; 2, compressor; 3, support shell; 201, connecting pipe; 202, conducting pipe; 203, exhaust pipe; 301, irradiation lamp; 302, roller; 303, receiving panel; 401, compression cylinder; 402, dust removal surface shell; 403, connecting pipe; 404, air outlet pipe; 405, strip air outlet; 406, dispersion pipe; 407, jet pipe; 408, air port; 409, connecting column; 410, connecting port; 411, rotating body; 412, blade; 413, bump; 414, mounting cover; 501, movable plug; 502, sealing ring; 503, abutting ring; 504, connecting rod; 505, reset spring; 601, mounting seat; 602, isolation plate; 603, electrical discharger. 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] Example 1: Please refer to Figures 1 to 3 , a device for detecting foreign matter on a BOPP film surface, comprising a support frame 1, a support shell 3 is fixedly installed on the upper end of the support frame 1 by bolts, and an observation window is fixedly installed on the front end of the support shell 3, so as to facilitate observation of the working conditions inside the support shell 3, a roller 302 for winding a film surface is rotatably installed on the inner end of the support shell 3, an irradiation lamp 301 is fixedly installed on the inner left end of the support shell 3 by bolts, a receiving panel 303 is fixedly installed on the upper left end of the support frame 1 by bolts, the receiving panel 303 is located directly below the irradiation lamp 301, and the light emitted by the irradiation lamp 301 irradiates the outer surface of the film and then projects to the upper end of the receiving panel 303, when dust appears on the surface of the film, the light emitted by the irradiation lamp 301 irradiates the outer surface of the film, when the light encounters particles with a size close to its wavelength, scattering occurs, that is, the light is reflected or refracted by the particles, thereby forming a Tyndall effect, and finally a visible light path is formed in a specific direction, and scattered on the upper end of the receiving panel 303, so as to detect whether there are foreign matter on the outer surface of the film;

[0033] Two compression cylinders 401 for transition are fixedly welded to the inner right end of the support shell 3, and the compression cylinders 401 are arranged in an up-and-down staggered manner on the inner side of the support shell 3. A dust removal surface shell 402 is provided on the side where the two compression cylinders 401 are close to each other, and the dust removal surface shell 402 is fixedly welded to the inner right end of the support shell 3. A mounting cover 414 is detachably installed at the end of the compression cylinders 401 away from each other, and the mounting covers 414 are fixedly connected through a conducting pipe 202. A compressor 2 is provided on the right side of the support frame 1, and a connecting pipe 201 is detachably installed at the output end of the compressor 2, and the other end of the connecting pipe 201 is fixedly connected to the conducting pipe 202, so that the compressor 2 can provide high-speed and high-pressure gas;

[0034] See also Figure 3 , 4 The inner end of the dust removal surface shell 402 is provided with a removal device that can remove impurities from the outer surface of the film, and a rotating body 411 is rotatably installed at the inner bottom end of the compression cylinder 401, and the width of the dust removal surface shell 402 is greater than the width of the film;

[0035] The removal device includes a dispersion pipe 406, which is fixedly installed on the inner upper end of the dust removal surface shell 402. The upper end of the dispersion pipe 406 is fixedly connected to the bottom end of the compression cylinder 401 through an air outlet pipe 404. There are multiple groups of dispersion pipes 406, which are arranged side by side on the inner upper end of the dust removal surface shell 402. There are also multiple groups of air outlet pipes 404, which are respectively connected to the multiple groups of dispersion pipes 406. A number of jet pipes 407 are fixedly installed on the bottom end of the dispersion pipe 406.

[0036] Example 2: Please refer to Figure 6 , 7 8. A foreign body detection device for BOPP film surface, based on Example 1, a movable plug 501 is passed through the inner side of the jet pipe 407, the bottom end of the movable plug 501 is exposed on the outer side of the jet pipe 407, a limit plate is fixedly installed on the bottom end of the movable plug 501, a hole is opened on the outer surface of the limit plate, a return spring 505 is arranged on the upper end of the limit plate, and the return spring 505 is clamped between the bottom end of the jet pipe 407 and the upper end of the limit plate, and the inner side of the jet pipe 407 is fixed with a limit plate. A sealing ring 502 is fixedly installed at the center, and the sealing ring 502 is made of rubber. The upper end of the movable plug 501 is arc-shaped, and the outer surface is smooth, thereby ensuring its airtightness. When the high-speed high-pressure gas reaches the upper end of the movable plug 501, it will push the movable plug 501 downward, and flow along the inner wall of the jet pipe 407 to the bottom end of the jet pipe 407, and then spray out from the holes on the outer surface of the limit plate, and spray on the outer surface of the film, causing it to vibrate, thereby achieving the purpose of shaking out the dust;

[0037] See also Figure 8 , 9 , multiple groups of connecting rods 504 are rotatably installed at the inner bottom end of the jet tube 407, and an abutment ring 503 is rotatably installed on the upper end of the connecting rod 504, and the abutment ring 503 is sleeved on the outer surface of the movable plug 501, and a torsion spring is clamped at the joint of the connecting rod 504. In order to prevent the upper end of the movable plug 501 from blocking the bottom end of the jet tube 407 when the movable plug 501 moves downward, the movable plug 501 drives the abutment ring 503 to move downward while descending, and the connecting rod 504 is folded by the downward force accompanied by the downward movement of the abutment ring 503, so that the connecting rod 504 will be folded into a "∟" shape, thereby limiting the movable plug 501 from continuing to move downward;

[0038] See also Figure 5 A connecting column 409 is fixedly installed at the inner bottom end of the compression cylinder 401, and a rotating body 411 is rotatably sleeved on the outer surface of the connecting column 409. The upper end of the connecting column 409 is conical, and the upper end of the rotating body 411 is also conical, so that the high-speed and high-pressure gas will be well guided and dispersed when passing through. A bearing is fixedly clamped at the connection between the rotating body 411 and the connecting column 409, and lubricating butter is applied, so that the rotating body 411 can rotate more smoothly;

[0039] See also Figure 3 , 4 , 5, 11, a plurality of blades 412 are fixedly mounted on the outer surface of the rotating body 411, so that when the high-speed and high-pressure airflow passes through the blades 412, the blades 412 drive the rotating body 411 to rotate, and a protrusion 413 is fixedly mounted on the bottom end of the rotating body 411, and the protrusion 413 is in contact with the inner bottom end of the compression cylinder 401, and a plurality of air ports 408 are opened on the inner bottom end of the compression cylinder 401, and the air ports 408 connect the air outlet pipe 404 with the inner cavity of the compression cylinder 401, and the width of the protrusion 413 is the same as the diameter of the air port 408, and when the protrusion 413 moves to the air port 408 following the rotation of the rotating body 411, the air port 408 is blocked, and the rotating rotating body 411 drives the protrusion 413 to reciprocate in this way The upper end of the air port 408 is wiped by the air port 408, so that the high-speed and high-pressure gas can flow into the air outlet pipe 404 through the air port 408 regularly and intermittently. A connecting pipe 403 is fixedly installed on the outer surface of the compression cylinder 401, and a connecting port 410 is opened at the inner end of the compression cylinder 401. The connecting port 410 connects the compression cylinder 401 and the connecting pipe 403 to each other. A strip air outlet 405 is fixedly installed on the right end of the dust removal surface shell 402, and the other end of the connecting pipe 403 is fixedly connected to the right end of the strip air outlet 405. The gas flows into the connecting pipe 403 and flows out from the strip air outlet 405, so that there is a high-speed airflow at the upper end of the film, which reduces the air pressure there, thereby realizing that the air pressure at the bottom of the film presses the film into an arc (such as Fig.11 As shown), the left end of the dust removal surface shell 402 is fixedly connected to the exhaust pipe 203, and the upper end of the exhaust pipe 203 passes through the upper end of the support shell 3, and the blown foreign matter is discharged from the end of the exhaust pipe 203;

[0040] like Figure 2 , 10 Two mounting seats 601 are fixedly installed on the inner right end of the support shell 3, and an eliminator 603 for releasing and neutralizing static electricity is fixedly installed on one end of the two mounting seats 601 close to each other. Charged particles are generated by radiation (such as ultraviolet rays) to neutralize static electricity. An isolation plate 602 is fixedly installed on the upper end of the eliminator 603, and the isolation plate 602 is made of transparent material.

[0041] The working principle of the present invention is:

[0042] When in use, as the film continuously passes through the outer surface of the drum 302, when any node of the film passes under the irradiation lamp 301, when dust appears on the surface of the film, the light emitted by the irradiation lamp 301 irradiates the outer surface of the film. When the light encounters particles with a size close to its wavelength, scattering occurs, that is, the light is reflected or refracted by the particles, thereby forming a visible light path in a specific direction and scattering at the upper end of the receiving panel 303, so as to detect whether there is foreign matter on the outer surface of the film, and then the node continues to move to the dust removal surface shell 402 along with the rolling of the drum 302;

[0043] At this time, the high-speed and high-pressure gas released by the compressor 2 is transmitted from the connecting pipe 201 to the conducting pipe 202, and the conducting pipe 202 distributes the high-speed and high-pressure gas to the upper and lower compression cylinders 401 disposed inside the supporting shell 3;

[0044] When the high-speed and high-pressure gas flows into the compression cylinder 401, the blade 412 drives the rotating body 411 to rotate, and the rotating body 411 drives the protrusion 413 to rub the upper end of the air port 408 back and forth, so that the high-speed and high-pressure gas can flow into the air outlet pipe 404 through the air port 408 regularly and intermittently, and a part of the gas flows into the connecting pipe 403 through the connecting port 410, and then flows out from the left end of the strip air outlet 405, so that there is a high-speed air flow at the upper end of the film, which reduces the air pressure there, and then the air pressure at the bottom of the film presses the film into an arc (such as Fig.11 shown);

[0045] Next, the high-speed and high-pressure gas in the gas outlet pipe 404 is distributed to each gas injection pipe 407 at the bottom through the dispersion pipe 406, and the airflow in the gas injection pipe 407 squeezes the movable plug 501 downward. While the movable plug 501 descends, it drives the abutment ring 503 to move downward, and as the abutment ring 503 moves downward, the connecting rod 504 is folded by the downward force, so that the connecting rod 504 is folded into a "∟" shape, and then ejected from the bottom end of the gas injection pipe 407 along the inner wall of the gas injection pipe 407. Since the protrusion 413 intermittently blocks the upper end of the open gas port 408, the gas injection pipe 407 can regularly and intermittently eject high-speed gas, so that the outer surface of the film squeezed into an arc by the air is intermittently subjected to impact force again, causing the film to oscillate (such as Fig.11 As shown), the eliminator 603 generates charged particles through radiation (such as ultraviolet rays) to neutralize static electricity, so that the static electricity on the outer surface of the film can be more fully eliminated, and static electricity on the outer surface of the film can be avoided to cause foreign matter to adhere to the outer surface and eventually be discharged from the exhaust pipe 203. Then the other end of the film is solved by the elimination device at the bottom end of the support shell 3.

[0046] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting foreign matter on a BOPP film surface, comprising a support frame (1), characterized in that: A support shell (3) is fixedly mounted on the upper end of the support frame (1); a roller (302) for winding the film surface is rotatably mounted on the inner end of the support shell (3); an irradiation lamp (301) is fixedly mounted on the inner left end of the support shell (3); a receiving panel (303) is fixedly mounted on the upper left end of the support frame (1); the receiving panel (303) is located directly below the irradiation lamp (301); and light emitted by the irradiation lamp (301) irradiates the outer surface of the film and is then projected onto the upper end of the receiving panel (303); two compression cylinders (401) for transition are fixedly mounted on the inner right end of the support shell (3); The compression cylinders (401) are arranged in an up-and-down staggered manner on the inner side of the support shell (3); a dust removal surface shell (402) is provided on the side where the two compression cylinders (401) are close to each other; the dust removal surface shell (402) is fixedly mounted on the right inner end of the support shell (3); a mounting cover (414) is detachably mounted on the ends of the compression cylinders (401) that are away from each other, and the mounting covers (414) are fixedly connected via a conducting tube (202); a removal device that can remove impurities from the outer surface of the film is provided on the inner end of the dust removal surface shell (402); and a rotating body (411) is rotatably mounted on the inner bottom end of the compression cylinder (401); The removal device comprises a dispersion pipe (406), wherein the dispersion pipe (406) is fixedly mounted on the inner upper end of the dust removal surface shell (402), the upper end of the dispersion pipe (406) is fixedly connected to the bottom end of the compression cylinder (401) via an air outlet pipe (404), a plurality of air injection pipes (407) are fixedly mounted on the bottom end of the dispersion pipe (406), and a plurality of groups of the dispersion pipes (406) are arranged side by side on the inner upper end of the dust removal surface shell (402), and a plurality of groups of the air outlet pipes (404) are also arranged and are respectively connected to the plurality of groups of dispersion pipes (406); A movable plug (501) is inserted into the inner side of the jet tube (407), the bottom end of the movable plug (501) is exposed outside the jet tube (407), a limit plate is fixedly mounted on the bottom end of the movable plug (501), a hole is provided on the outer surface of the limit plate, a return spring (505) is provided on the upper end of the limit plate, and the return spring (505) is clamped between the bottom end of the jet tube (407) and the upper end of the limit plate; A plurality of connecting rods (504) are rotatably mounted on the inner bottom end of the jet pipe (407), an abutment ring (503) is rotatably mounted on the upper end of the connecting rod (504), and the abutment ring (503) is sleeved on the outer surface of the movable plug (501), and a torsion spring is clamped at the joint of the connecting rod (504); A connecting column (409) is fixedly mounted on the inner bottom end of the compression cylinder (401), and the rotating body (411) is rotatably sleeved on the outer surface of the connecting column (409), the upper end of the connecting column (409) is conical, and the upper end of the rotating body (411) is also conical, and a bearing is fixedly clamped at the connection between the rotating body (411) and the connecting column (409); A plurality of blades (412) are fixedly mounted on the outer surface of the rotating body (411), a convex block (413) is fixedly mounted on the bottom end of the rotating body (411), the convex block (413) is in contact with the inner bottom end of the compression cylinder (401), and a plurality of air ports (408) are provided on the inner bottom end of the compression cylinder (401), the air ports (408) connect the air outlet pipe (404) and the inner cavity of the compression cylinder (401) to each other; The width of the protrusion (413) is the same as the diameter of the air port (408), and when the protrusion (413) moves to the air port (408) following the rotation of the rotating body (411), the air port (408) at that location is blocked; A connecting pipe (403) is fixedly mounted on the outer surface of the compression cylinder (401), and a connecting port (410) is provided at the inner end of the compression cylinder (401), wherein the connecting port (410) connects the compression cylinder (401) and the connecting pipe (403) to each other; A strip-shaped air outlet (405) is fixedly mounted on the right end of the dust removal surface shell (402), and the other end of the connecting pipe (403) is fixedly connected to the right end of the strip-shaped air outlet (405), so that gas flows into the connecting pipe (403) and flows out from the strip-shaped air outlet (405).

2. The device for detecting foreign matter on BOPP film surface according to claim 1, characterized in that: Two mounting seats (601) are fixedly mounted on the inner right end of the support shell (3), and a eliminator (603) for releasing and neutralizing static electricity is fixedly mounted on one end of the two mounting seats (601) close to each other.

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