Biaxially-oriented polypropylene (BOPP) film drawing material cleaning mechanism

Abstract

The invention discloses a BOPP film stretching material cleaning mechanism, and belongs to the technical field of film cleaning, the BOPP film stretching material cleaning mechanism comprises a supporting seat and material guide rollers mounted on two sides of the upper surface of the supporting seat and used for conveying a BOPP film, the upper surface of the supporting seat is further fixedly provided with a mounting frame of a C-shaped structure, and the upper side and the lower side in the mounting frame are both provided with sliding grooves; each sliding groove is slidably connected with one side of a sliding plate, the other side of each sliding plate is connected with a brush plate through a pneumatic extrusion mechanism, and bristles are distributed on the opposite sides of the two brush plates. According to the device, chippings can be brushed away through movement of the BOPP film and relative movement of bristles on the brush plate, the brush plate can drive the bristles to reciprocate in the direction perpendicular to the movement direction of the BOPP film, the chipping brushing effect can be improved, in addition, in the reciprocating movement process, the bristles can be affected by sprayed gas, and the chipping effect can be improved. And scraps adsorbed on the bristles can be reduced, so that the effect of removing the scraps by the brush can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of film cleaning, and specifically provides a cleaning mechanism for BOPP film stretching and discharging. Background Art

[0002] The production of BOPP film needs to go through processes such as extrusion, sheet casting, longitudinal stretching, and transverse stretching. During the high-temperature stretching process, the edges of the film are prone to film breakage and wire drawing. At the same time, equipment friction or raw material impurities will cause debris to adhere. If not cleaned in time, these pollutants will affect the transparency and flatness of the film and the yield rate of subsequent processes such as printing and lamination.

[0003] The BOPP film stretching and discharging cleaning mechanism is a mechanism for cleaning debris during the stretching and discharging process of BOPP film, which can reduce the impact of pollutants on the film.

[0004] When the existing BOPP film stretching and discharging cleaning mechanism is in use, the structure for brushing off debris is fixed and only relies on the relative movement between the discharging of the BOPP film and it to achieve brushing off debris. For example, a BOPP film stretching and discharging cleaning device disclosed in the publication number CN216026475U only generates relative movement between the movement of the film and the fixed cleaning brush to brush off impurities on the film. This method has poor effect in brushing off debris impurities and is likely to reduce the yield rate.

[0005] In addition, with the increase in the use time of the existing BOPP film stretching and discharging cleaning mechanism, more and more debris will be generated on the cleaning brush, which is not conducive to ensuring the effect of subsequent debris brushing.

[0006] Therefore, a BOPP film stretching and discharging cleaning mechanism is needed to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a BOPP film stretching and discharging cleaning mechanism to solve the problem of poor debris brushing effect in the use process of the existing BOPP film stretching and discharging cleaning mechanism mentioned in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A BOPP film stretching and discharging cleaning mechanism, including a support seat and guide rollers installed on both sides of its upper surface for conveying the BOPP film. The upper surface of the support seat is also fixedly installed with an installation frame in a C-shaped structure, and sliding grooves are provided on both the upper and lower sides inside the installation frame. One side of a sliding plate is slidably connected to each sliding groove, and the other side of the sliding plate is connected to a brush plate through a pneumatic extrusion mechanism. Brush hairs are distributed on the side of the two brush plates facing each other. A dust suction pipe is fixedly connected to the installation frame, and the dust suction pipe is connected to the installation frame through a dust suction mechanism. The dust suction mechanism is connected to the brush plate through a reciprocating mechanism.

[0010] Preferably, the pneumatic extrusion mechanism includes piston tubes evenly distributed at equal angles on the other side of the sliding plate. One end of a piston block is slidably connected without a seam inside the open end of the piston tube, and the other end of the piston block is fixedly connected to the brush plate. A spring nested outside the corresponding piston block is arranged between the brush plate and the piston tube.

[0011] Preferably, the dust suction mechanism includes a servo motor installed on the support seat. An inner groove is provided on the dust suction pipe, and one end of the rotating shaft of a fan blade assembly is connected by a bearing to one side inside the inner groove. The other end of the rotating shaft of the fan blade assembly sequentially passes through the other side inside the inner groove and one end of the dust suction pipe by bearings. The fan blade assembly includes fan blades installed on the rotating shaft for generating suction. One end of the rotating shaft on the fan blade assembly is also connected to the servo motor through a belt drive structure. An adsorption box is arranged inside the support seat, and a limiting block is provided on the adsorption box for limiting and engaging with the support seat. A notch is provided on the support seat for limiting and engaging with the limiting block to position the adsorption box. The other end of the dust suction pipe is connected through a through connection to one end of a dust guide pipe, and the other end of the dust guide pipe movably passes through the support seat and is threadedly connected through the adsorption box.

[0012] Preferably, the dust suction mechanism further includes dust suction bins arranged inside the upper and lower ends of the installation frame, and dust suction ports communicating with the corresponding dust suction bins are opened on both the upper and lower sides inside the installation frame. Two strip-shaped channels are provided at one end of the dust suction pipe, which are respectively connected through to the two dust suction bins for generating suction at the dust suction ports.

[0013] Preferably, the dust suction ports are inclined towards the brush hairs, and the minimum distance between the two strip-shaped dust suction ports at the same height is greater than the maximum width of the sliding plate to prevent the sliding plate from blocking the dust suction ports and causing the dust suction ports to be unable to absorb dust.

[0014] Preferably, the reciprocating mechanism includes support tubes provided on both the upper and lower sides inside the mounting frame. At one end of the support tube close to the dust suction tube, three strip-shaped through holes penetrating both its inner and outer sides are arranged at equal angles. At one end of the support tube close to the dust suction tube, a limiting hole coaxial with it is also provided, and the tail end of the piston column extends into the limiting hole movably. On the outer side of the middle part of the piston column, three protrusions respectively penetrating the three strip-shaped through holes are provided, and the upper ends of a connecting frame are connected to the outer sides of the three protrusions. The outer end of the connecting frame is of an annular structure and is coaxial with the piston column. On the inner end of each connecting frame, two rollers are connected by bearings, and a toggle plate is slidably engaged between the two rollers. The toggle plate is of a twisted disc-shaped structure and is used to drive the connecting frame to reciprocate when the toggle plate rotates in cooperation with the rollers. The toggle plate is fixedly arranged at the other end of the rotating shaft of the fan blade assembly. The inner ends of the two connecting frames are respectively fixedly connected to one side of the two sliding plates.

[0015] Preferably, the reciprocating mechanism further includes the head end of the piston column that is seamlessly and slidably connected to the inner side of the other end of the support tube close to the sliding plate. On the other end part of the support tube close to the sliding plate, one-way air inlet holes are arranged at equal angles. A gas guide tube is connected through the other end of the support tube close to the sliding plate, and the gas guide tube is arranged between the sliding plate and the brush plate. A branch pipe is arranged on the gas guide tube for being connected through to the corresponding piston tube.

[0016] Preferably, an air collecting chamber is arranged inside the brush plate, and strip-shaped air jet ports penetrating through to the air collecting chamber are arranged on the side of the brush plate provided with bristles.

[0017] Preferably, a tube groove penetrating through the piston tube and the air collecting chamber is arranged on the piston block, and the inner diameter of the tube groove is not greater than 1 / 2 of the inner diameter of the branch pipe on the gas guide tube. The inner diameter of the gas guide tube is the same as the inner diameter of the branch pipe thereon.

[0018] Preferably, the gas guide tube is of a loop structure, and the inner diameter of the part where the gas guide tube is connected to the support tube is the same as the inner diameter of the gas guide tube, ensuring that the amount of gas entering the gas guide tube per unit time is the same as the amount of gas discharged from the gas guide tube to the piston tube.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The BOPP film stretching and discharging cleaning mechanism can not only brush off debris by the relative movement between the movement of the BOPP film and the bristles on the brush plate, but also enable the brush plate to drive the bristles to reciprocate in the direction perpendicular to the movement direction of the BOPP film, thereby helping to improve the effect of brushing off debris. In addition, during the reciprocating movement, the bristles can be affected by the ejected gas, which helps to reduce the debris adsorbed on the bristles, and further can ensure the effect of the bristles brushing off debris:

[0020] 1. When the servo motor is running, the fan blade assembly rotates, and the rotating shaft on it drives the toggle plate to rotate, which in turn causes the connecting frame to drive the corresponding sliding plate to move back and forth. During this process, the sliding plate drives the brush plate to move back and forth through the pneumatic extrusion mechanism, thereby improving the effect of brushing away debris;

[0021] 2. During the reciprocating movement of the connecting frame, the piston column will be driven to reciprocate synchronously. With the one-way air inlet hole, the external gas can continuously enter the support tube, and then continuously enter the piston tube through the air guide tube, and then enter the air collection chamber through the piston block, and finally spray to the bristles from the air jet port, thereby reducing the debris adsorbed on the bristles, which helps to ensure the effect of brushing the bristles to remove debris;

[0022] 3. In the process of gas entering the piston tube through the air guide tube and entering the gas collecting bin through the piston block, since the amount of gas entering the piston tube per unit time is greater than the amount of gas entering the gas collecting bin per unit time, positive pressure will be generated in the piston tube, causing the piston block to move under pressure, thereby ensuring a certain pressure between the bristles and the BOPP film, which helps to improve the effect of the bristles on the brush plate in removing debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the connection structure between the guide roller and the BOPP film of the present invention;

[0024] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between the adsorption box and the mounting frame of the present invention;

[0026] Figure 4 It is a schematic diagram of a partial longitudinal section structure of the mounting frame of the present invention;

[0027] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of point A;

[0028] Figure 6 It is a schematic diagram of a partial cross-sectional structure of the mounting frame of the present invention;

[0029] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure of point B in the middle;

[0030] Figure 8 This is a schematic diagram of the connection structure between the servo motor and the mounting frame of the present invention;

[0031] Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at point C in the middle.

[0032] In the figure: 1. support seat; 2. guide roller; 3. adsorption box; 4. limit block; 5. dust suction pipe; 6. mounting frame; 7. servo motor; 8. dust guide pipe; 9. inner groove; 10. sliding plate; 11. dust suction bin; 12. piston tube; 13. piston block; 14. brush plate; 15. air collecting bin; 16. air jet; 17. spring; 18. air guide pipe; 19. dust suction port; 20. fan blade assembly; 21. toggle plate; 22. belt drive structure; 23. support tube; 24. one-way air inlet hole; 25. strip through hole; 26. limit hole; 27. piston column; 28. connecting frame; 29. roller; 30. slide groove. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figures 1 - 9 , the present invention provides the following technical solutions:

[0035] Embodiment 1: In order to solve the problem that the cleaning brush of the previous BOPP film stretching and discharging cleaning mechanism is prone to absorb a lot of debris after long-term use, and thus cannot ensure the effect of subsequent brushing off of debris, the following technical solution is provided, specifically, a BOPP film stretching and discharging cleaning mechanism, including a support seat 1 and guide rollers 2 installed on both sides of its upper surface for conveying BOPP film, the upper surface of the support seat 1 is also fixedly installed with a mounting frame 6 with a C-shaped structure, and the upper and lower sides of the mounting frame 6 are provided with slide grooves 30, each of the slide grooves 30 is slidably connected to one side of the sliding plate 10, and the other side of the sliding plate 10 is connected to a brush plate 14 through a pneumatic extrusion mechanism, and bristles are distributed on the opposite sides of the two brush plates 14, and a dust suction pipe 5 is fixedly connected to the mounting frame 6, and the dust suction pipe 5 is connected to the mounting frame 6 through a dust suction mechanism.

[0036] The pneumatic extrusion mechanism includes piston tubes 12 that are equally angularly distributed on the other side of the sliding plate 10. One end of a piston block 13 is slidably and seamlessly connected inside the open end of the piston tube 12, and the other end of the piston block 13 is fixedly connected to a brush plate 14. A spring 17 nested outside the corresponding piston block 13 is provided between the brush plate 14 and the piston tube 12. An air collecting chamber 15 is provided inside the brush plate 14, and a strip-shaped air jet port 16 that penetrates through to the air collecting chamber 15 is formed on the side of the brush plate 14 where the bristles are provided. A tube groove that penetrates through the piston tube 12 and the air collecting chamber 15 is provided on the piston block 13, and the inner diameter of the tube groove is not greater than 1 / 2 of the inner diameter of the branch pipe on the air guide pipe 18. The inner diameter of the air guide pipe 18 is the same as the inner diameter of the branch pipe thereon. The air guide pipe 18 is of a loop structure, and the inner diameter of the part where the air guide pipe 18 is connected to the support pipe 23 is the same as the inner diameter of the air guide pipe 18, ensuring that the amount of gas entering the air guide pipe 18 per unit time is the same as the amount of gas discharged from the air guide pipe 18 to the piston tube 12. During the process of gas entering the piston tube 12 through the air guide pipe 18 and entering the air collecting chamber 15 through the piston block 13, since the inner diameter of the tube groove provided on the piston block 13 is small, the amount of gas entering the piston tube 12 per unit time is greater than the amount of gas entering the air collecting chamber 15 per unit time. Therefore, positive pressure is generated inside the piston tube 12, causing the piston block 13 to be pressed and drive the brush plate 14 to move, thereby ensuring that there is a certain pressure between the bristles and the BOPP film, which helps to ensure the effect of the bristles brushing off dust.

[0037] The dust suction mechanism includes a servo motor 7 installed on the support seat 1, an inner groove 9 is provided on the dust suction pipe 5, and one side of the inner groove 9 is connected to one end of the rotating shaft of the fan blade assembly 20 by a bearing, and the other end of the rotating shaft of the fan blade assembly 20 passes through the other side of the inner groove 9 and one end of the dust suction pipe 5 in turn, and the fan blade assembly 20 includes a fan blade installed on the rotating shaft for generating suction, one end of the rotating shaft on the fan blade assembly 20 is also connected to the servo motor 7 through a belt transmission structure 22, an adsorption box 3 is arranged inside the support seat 1, and a limit block 4 is provided on the adsorption box 3 for limited engagement with the support seat 1, a notch is provided on the support seat 1 for limited engagement with the limit block 4, so as to position the adsorption box 3, the other end of the dust suction pipe 5 is through-connected with one end of the dust guide pipe 8, and the other end of the dust guide pipe 8 movably passes through the support seat 1 and is threadedly connected to the adsorption box 3, the dust suction mechanism also includes a dust suction bin 11 arranged at the upper and lower ends of the mounting frame 6, and both upper and lower sides of the mounting frame 6 are provided with through-to-corresponding The dust suction port 19 of the dust suction bin 11, one end of the dust suction pipe 5 is provided with two strip channels, which are respectively connected with the two dust suction bins 11, and are used to generate suction at the dust suction port 19, and the dust suction port 19 is inclined toward the bristles, and the minimum spacing between the two strip dust suction ports 19 at the same height is greater than the maximum width of the sliding plate 10, so as to avoid the sliding plate 10 blocking the dust suction port 19, resulting in the dust suction port 19 being unable to absorb dust. During the operation of the servo motor 7, the rotating shaft on the fan blade assembly 20 is driven to rotate, thereby driving The toggle plate 21 rotates, and through the rotation of the toggle plate 21, the connecting frame 28 equipped with the roller 29 can be driven to move back and forth. This process will cause the piston column 27 to move back and forth synchronously. Cooperating with the one-way air inlet 24, the external gas can continuously enter the support tube 23, and then enter the piston tube 12 through the air guide tube 18. After that, it enters the air collecting chamber 15 through the piston block 13 and is sprayed toward the bristles from the air jet port 16, thereby reducing the debris adsorbed on the bristles, which helps to ensure the effect of the bristles in removing debris.

[0038] Embodiment 2: In order to solve the problem that the previous BOPP film stretching discharge cleaning mechanism only relies on the relative movement of the film and the fixed cleaning brush to brush away the debris, resulting in poor effect of brushing away the debris, the following technical solution is provided, specifically, the dust collection mechanism is connected to the brush plate 14 through a reciprocating mechanism.

[0039] The reciprocating mechanism includes support tubes 23 arranged on both the upper and lower sides inside the mounting frame 6. At one end of the support tube 23 close to the dust suction tube 5, three strip-shaped through holes 25 penetrating through its inner and outer sides are arranged at equal angles. At one end of the support tube 23 close to the dust suction tube 5, a limiting hole 26 coaxial with it is also arranged. The tail end of the piston column 27 extends into the limiting hole 26 movably. On the outer side of the middle part of the piston column 27, three protrusions respectively penetrating through the three strip-shaped through holes 25 are arranged. The outer sides of the three protrusions are connected to the upper end of the connecting frame 28. The outer end of the connecting frame 28 is of an annular structure and is coaxially arranged with the piston column 27. On the inner end of each connecting frame 28, two rollers 29 are connected by bearings. A toggle plate 21 is slidably engaged between the two rollers 29. The toggle plate 21 is of a twisted disc-shaped structure and is used to drive the connecting frame 28 to reciprocate when the toggle plate 21 rotates, in cooperation with the rollers 29. The toggle plate 21 is fixedly arranged at the other end of the rotating shaft of the fan blade assembly 20. The inner ends of the two connecting frames 28 are respectively fixedly connected to one side of the two sliding plates 10. The reciprocating mechanism further includes the head end of the piston column 27 which is in seamless sliding connection with the inner side of the other end of the support tube 23 close to the sliding plate 10. On the other end part of the support tube 23 close to the sliding plate 10, one-way air inlet holes 24 are arranged at equal angles. A gas guide tube 18 is connected through the other end of the support tube 23 close to the sliding plate 10. The gas guide tube 18 is arranged between the sliding plate 10 and the brush plate 14. A branch pipe is arranged on the gas guide tube 18 for communicating with the corresponding piston tube 12. When the servo motor 7 operates and drives the connecting frame 28 to reciprocate, the sliding plate 10 will be driven to move synchronously. Through the pneumatic extrusion mechanism, the brush plate 14 can reciprocate with the sliding plate 10, and further the brush plate 14 can reciprocate along the direction perpendicular to the movement of the BOPP film, thereby improving the effect of the brush for removing dust.

[0040] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A BOPP film stretching and discharging cleaning mechanism, comprising a support base (1) and material guiding rollers (2) installed on both sides of its upper surface for conveying the BOPP film, characterized in that: The upper surface of the support base (1) is also fixedly installed with a mounting frame (6) in a C-shaped structure. Both the upper and lower sides inside the mounting frame (6) are provided with chutes (30). One side of a sliding plate (10) is slidably connected to each chute (30). The other side of the sliding plate (10) is connected to a brush plate (14) through a pneumatic extrusion mechanism. The opposite sides of the two brush plates (14) are distributed with bristles. A dust suction pipe (5) is fixedly connected to the mounting frame (6), and the dust suction pipe (5) is connected to the mounting frame (6) through a dust suction mechanism. The dust suction mechanism is connected to the brush plate (14) through a reciprocating mechanism.

2. The cleaning mechanism for the drawn and discharged BOPP film according to claim 1, characterized in that: The pneumatic extrusion mechanism includes piston pipes (12) evenly distributed at equal angles on the other side of the sliding plate (10). One end of a piston block (13) is slidably and seamlessly connected inside the open end of the piston pipe (12). The other end of the piston block (13) is fixedly connected to the brush plate (14). A spring (17) nested outside the corresponding piston block (13) is arranged between the brush plate (14) and the piston pipe (12).

3. A BOPP film stretching and discharging cleaning mechanism according to claim 2, characterized in that: The dust suction mechanism includes a servo motor (7) installed on the support base (1). An inner groove (9) is provided on the dust suction pipe (5). One end of the rotating shaft of a fan blade assembly (20) is connected by a bearing to one side inside the inner groove (9). The other end of the rotating shaft of the fan blade assembly (20) sequentially passes through the other side inside the inner groove (9) and one end of the dust suction pipe (5) by bearings. The fan blade assembly (20) includes fan blades installed on the rotating shaft for generating suction. One end of the rotating shaft on the fan blade assembly (20) is also connected to the servo motor (7) through a belt drive structure (22). An adsorption box (3) is arranged inside the support base (1). A limiting block (4) is provided on the adsorption box (3) and is limited and engaged with the support base (1). A notch is provided on the support base (1) for limiting and engaging with the limiting block (4) to position the adsorption box (3). The other end of the dust suction pipe (5) is connected in a through manner to one end of a dust guide pipe (8), and the other end of the dust guide pipe (8) movably passes through the support base (1) and is threadedly connected to the adsorption box (3) in a through manner.

4. A BOPP film stretching and discharging cleaning mechanism according to claim 3, characterized in that: The dust suction mechanism further includes dust suction chambers (11) arranged inside the upper and lower ends of the mounting frame (6). Dust suction ports (19) that penetrate through to the corresponding dust suction chambers (11) are opened on both the upper and lower sides inside the mounting frame (6). One end of the dust suction pipe (5) is provided with two strip-shaped channels respectively connected in a through manner to the two dust suction chambers (11) for generating suction at the dust suction ports (19).

5. The BOPP film stretching and discharging cleaning mechanism according to claim 4, characterized in that: The dust suction port (19) is inclined towards the bristles. The minimum distance between the two strip-shaped dust suction ports (19) at the same height is greater than the maximum width of the sliding plate (10) to prevent the sliding plate (10) from blocking the dust suction port (19) and causing the dust suction port (19) to be unable to absorb dust.

6. A BOPP film stretching and discharging cleaning mechanism according to claim 5, characterized in that: The reciprocating mechanism includes support tubes (23) arranged on both the upper and lower sides inside the mounting frame (6). At one end of the support tube (23) close to the dust suction tube (5), three strip-shaped through holes (25) penetrating through its inner and outer sides are arranged at equal angles. At one end of the support tube (23) close to the dust suction tube (5), a limiting hole (26) coaxial with it is also arranged, and the tail end of the piston column (27) extends into the limiting hole (26) movably. On the outer side of the middle part of the piston column (27), three protrusions respectively penetrating through the three strip-shaped through holes (25) are arranged, and the upper ends of a connecting frame (28) are connected to the outer sides of the three protrusions. The outer end of the connecting frame (28) is of an annular structure and is arranged coaxially with the piston column (27). On the inner end of each connecting frame (28), two rollers (29) are connected by bearings, and a toggle plate (21) is slidably engaged between the two rollers (29). The toggle plate (21) is of a twisted disc-shaped structure and is used to drive the connecting frame (28) to reciprocate in cooperation with the rollers (29) when the toggle plate (21) rotates. The toggle plate (21) is fixedly arranged at the other end of the rotating shaft of the fan blade assembly (20). The inner ends of the two connecting frames (28) are respectively fixedly connected to one side of the two sliding plates (10).

7. A BOPP film stretching and discharging cleaning mechanism according to claim 6, characterized in that: The reciprocating mechanism further includes the head end of the piston column (27) slidably and seamlessly connected to the inner side of the other end of the support tube (23) close to the sliding plate (10). At the other end of the support tube (23) close to the sliding plate (10), one-way air inlet holes (24) are arranged at equal angles. At the other end of the support tube (23) close to the sliding plate (10), an air guide tube (18) is connected through. The air guide tube (18) is arranged between the sliding plate (10) and the brush plate (14), and branch tubes are arranged on the air guide tube (18) for being connected to the corresponding piston tubes (12) through.

8. A BOPP film stretching and discharging cleaning mechanism according to claim 7, characterized in that: A gas collecting chamber (15) is arranged inside the brush plate (14), and strip-shaped air jet openings (16) penetrating through to the gas collecting chamber (15) are arranged on the side of the brush plate (14) provided with bristles.

9. A BOPP film stretching and discharging cleaning mechanism according to claim 8, characterized in that: A tube groove penetrating through the piston tube (12) and the gas collecting chamber (15) is arranged on the piston block (13), and the inner diameter of the tube groove is not greater than 1 / 2 of the inner diameter of the branch tube on the air guide tube (18). The inner diameter of the air guide tube (18) is the same as the inner diameter of the branch tube on it.

10. A BOPP film stretching and discharging cleaning mechanism according to claim 9, characterized in that: The air guide tube (18) is of a loop structure, and the inner diameter of the part of the air guide tube (18) connected to the support tube (23) is the same as the inner diameter of the air guide tube (18), ensuring that the amount of gas entering the air guide tube (18) per unit time is the same as the amount of gas discharged from the air guide tube (18) to the piston tube (12).

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