Raw material screening device for composite PET polyester film production

Abstract

The invention relates to the technical field of screening, in particular to a raw material screening device for composite PET polyester film production, which comprises a dust removal assembly, a dust removal assembly, a first discharge pipeline arranged at the bottom of the horn mouth and a rotating disc arranged in the horn mouth, and the rotating disc comprises a first inclined surface and an air suction plate arranged between the horn mouth and the rotating disc; a first channel penetrates through the air suction plate, and the interior and the exterior of the air suction plate are communicated through an air outlet; the filtering assembly comprises a filtering plate arranged in the horn mouth and a second discharging pipeline which is arranged in the horn mouth and can move up and down. Raw material particles are subjected to dust removal through collision, dust is drained through an air blowing opening, and the cleanliness of the raw material particles before screening is guaranteed. Meanwhile, by screening the raw material particles in different size ranges, it is guaranteed that the range difference of the raw material particles used in the same batch is not large, and the stability and production efficiency of the follow-up process are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of screening, and particularly to a raw material screening device for the production of composite PET polyester films. Background Art

[0002] Polyester film (PET) is a film material made from polyethylene terephthalate glycol as raw material, extruded into thick sheets and then biaxially stretched; to obtain high-quality polyester films, the first consideration is of course the source of production - the product raw materials. During the production process, it is required that the plastic raw materials be pure, with low impurity content and no dust, as dust will greatly affect the stability of the melting point and viscosity of the plastic raw materials, and thus have a great impact on the subsequent processing of the raw materials. Traditional screening is to place the raw materials on a sieve for screening, but the raw materials are exposed to the outside, and it is easy to fall into dust while screening dust. When using a vibrating motor during screening, the noise is large.

[0003] At the same time, screening can remove impurities, foreign objects and non-conforming particles in the raw materials. The size and shape of the raw material particles after screening are more uniform, which helps to maintain stable process parameters during subsequent melting, extrusion and stretching processes. This can not only improve production efficiency, but also reduce product performance differences caused by uneven raw materials. Summary of the Invention

[0004] In this part, as well as in the abstract and title of the specification of the present application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract of the specification and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above or prior art, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a raw material screening device for the production of composite PET polyester films, the dust removal component of which includes a flared mouth, a first discharge pipe is provided at the bottom of the flared mouth, and a rotating disk is provided inside the flared mouth. Among them, the rotating disk includes a first inclined surface, and a suction plate is provided between the flared mouth and the rotating disk. The suction plate is provided with a first channel, and the inside and outside of the suction plate are communicated by an air outlet. The filtering component includes a filter plate provided inside the flared mouth and a second discharge pipe that can move up and down inside the flared mouth.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A raw material screening device for the production of composite PET polyester films, the inner diameter of the flared mouth forms a second inclined surface that continuously shrinks from top to bottom, and the suction plate is located between the first inclined surface and the second inclined surface.

[0008] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a sleeve is provided at one end of the rotating disk close to the filter plate, and a first slider is provided on the outer wall of the sleeve; A second channel through which the second discharge pipe can slide is provided through the center position of the filter plate, and a second slider that can contact the first slider is provided on the end face of the filter plate.

[0009] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a fixing ring is provided on the outer wall of the second discharge pipe, and a sliding rod is provided on the outer wall of the fixing ring; A first moving groove for the sliding rod to slide is provided on the outer wall of the first discharge pipe.

[0010] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a first chute is provided on the inner wall of the second discharge pipe, a driving shaft is provided inside the second discharge pipe, and a third slider that can slide along the inside of the first chute is provided on the outer wall of the driving shaft.

[0011] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: one end of the driving shaft extends into the sleeve.

[0012] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a partition plate is provided inside the sleeve, and the driving shaft passes through the partition plate; a limiting block is provided on the outer wall of the driving shaft above the partition plate; A telescopic limiting member is provided inside the sleeve.

[0013] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a third channel through which the limiting member can slide is provided through the sleeve, and the limiting member includes a limiting rod that slides along the inside of the third channel, a limiting plate is provided at one end of the limiting rod close to the inside, and a first elastic member is provided between the limiting plate and the inner wall of the sleeve.

[0014] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: threads are provided on the outer walls of both the first discharge pipe and the second discharge pipe.

[0015] As a preferred embodiment of the raw material screening device for the production of the composite PET polyester film of the present invention, wherein: a support frame is connected to the outer wall of the bell mouth and the support frame is attached to the outer wall of the bell mouth.

[0016] Advantages of the present invention: The present invention uses collisions to remove dust from raw material particles and uses air blowing ports to divert dust, ensuring the cleanliness of raw material particles before screening. At the same time, by screening raw material particles in different size ranges, it is ensured that the range gap of raw material particles used in the same batch is not very large, ensuring the stability and production efficiency of subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them: Figure 1 It is an overall three-dimensional view of the raw material screening device for composite PET polyester film production.

[0018] Figure 2 It is a schematic diagram of the internal structure of the flared opening of the raw material screening device for composite PET polyester film production.

[0019] Figure 3 It is Figure 2 The enlarged schematic diagram of the structure of area A in

[0020] Figure 4 It is Figure 2 The enlarged schematic diagram of the structure of area B in

[0021] Figure 5 It is an overall cross-sectional view of the raw material screening device for composite PET polyester film production.

[0022] Figure 6 It is Figure 5 The enlarged schematic diagram of the structure of area C in

[0023] Figure 7 It is the unfolded schematic diagram of the first sliding groove.

[0024] Figure 8 It is the cooperation schematic diagram of the driving rod and the limiting member.

[0025] In the figure: 100, dust removal component; 101, bell mouth; 101a, first discharge pipe; 101b, second inclined surface; 101c, first moving groove; 102, rotating disk; 102a, first inclined surface; 103, suction plate; 103a, first channel; 103b, air outlet; 200, filtering component; 201, filter plate; 201a, second channel; 201b, second slider; 202, second discharge pipe; 202a, first chute; 203, sleeve; 203a, first slider; 203b, third channel; 204, fixing ring; 204a, slide bar; 205, drive shaft; 205a, third slider; 205b, limiting block; 205b-1, first arc surface; 205b-2, cross section; 206, partition board; 207, limiting part; 207a, limiting rod; 207a-1, limiting plate; 207b, first elastic part; 301, support frame. Detailed implementation mode

[0026] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific implementation mode of the present invention in detail with reference to the accompanying drawings of the specification.

[0027] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it an embodiment that is separate or selectively mutually exclusive with other embodiments. Embodiment 1

[0029] Referring to Figures 1-2 , for the first embodiment of the present invention, this embodiment provides a raw material screening device for the production of composite PET polyester film, which includes a dust removal component 100, including a bell mouth 101. The bottom of the bell mouth 101 is provided with a first discharge pipe 101a and a rotating disk 102 arranged inside the bell mouth 101. Among them, the rotating disk 102 includes a first inclined surface 102a and a suction plate 103 arranged between the bell mouth 101 and the rotating disk 102; The suction plate 103 is provided with a first channel 103a through it, and the inside and outside of the suction plate 103 are communicated by an air outlet 103b; A filtering component 200, including a filter plate 201 arranged inside the bell mouth 101 and a second discharge pipe 202 arranged inside the bell mouth 101 and capable of moving up and down.

[0030] Among them, as Figure 1 shown, a rotating disk 102 is arranged inside the bell mouth 101. The first inclined surface 102a on the outer wall of the rotating disk 102 is not parallel to the inner wall of the bell mouth 101, and the radius of the outer wall of the rotating disk 102 gradually increases from top to bottom, thus forming the first inclined surface 102a. A motor is externally connected to the rotating disk 102, and the rotating disk 102 can be driven to rotate by relying on the motor. When working, the motor drives the rotating disk 102 to rotate, and raw material particles enter the inside of the bell mouth 101 from the outside. At the same time, they hit the surface of the first inclined surface 102a on the outer wall of the rotating disk 102. Because the rotating disk 102 is rotating, the raw material particles hitting the surface will be thrown away and then hit the inner wall of the bell mouth 101, thus generating back-and-forth collisions, and using the collisions to remove dust from the surface of the raw materials.

[0031] At the same time, the inside of the suction plate 103 is a cavity structure, and the first channel 103a runs through from top to bottom. There are air outlet ports 103b on the inner wall of the first channel 103a and communicate with the inside of the suction plate 103. A dust collection device is externally connected to the suction plate 103, and a common dust collection device on the market can be directly used for this device, which will not be elaborated here. The advantage of this design here is that an air flow towards the suction plate 103 can be formed at the first channel 103a. That is, when the raw material particles to be processed pass through the first channel 103a, the dust will be sucked into the inside of the suction plate 103 by the air flow here and thus collected by the dust collection device.

[0032] A filter plate 201 is installed below the suction plate 103. The filter plate 201 is mainly a filter net. After the dust-removed raw material particles fall onto the surface of the filter plate 201, the filter plate 201 filters the raw materials with too large particles, thus ensuring that particles within different particle ranges can be separated. It should be noted here that the first channel 103a can also be used as a screening standard according to requirements. That is, the suction plate 103 cooperates with the filter plate 201 to be able to filter out too large and too small particles, ensuring that the screened range can slide out and be collected through the second discharge pipe 202.

[0033] Among them, the filter plate 201 is slidably connected to the second discharge pipe 202. The second discharge pipe 202 can move above the filter plate 201. The protruding part can block the raw material particles on the upper surface of the filter plate 201 from entering the inside of the second discharge pipe 202. When the second discharge pipe 202 moves below the filter plate 201, the raw material particles above the filter plate 201 can be transported out through the second discharge pipe 202. At the same time, the smaller particles are transported out through the first discharge pipe 101a.

[0034] In summary, the raw material particles are added into the interior of the flared opening 101, and the raw material particles first come into contact with the first inclined surface 102a. Subsequently, due to the rotation of the rotating disk 102, the raw material particles will be thrown away and then rebound from the inner wall of the flared opening 101, forming a path of back-and-forth collision, thereby removing the dust adhering to the surface of the particles by means of the collision. Subsequently, the raw material particles that meet the size of the first channel 103a enter below the suction plate 103 and fall on the surface of the filter plate 201. Subsequently, through the screening of the filter plate 201, the raw material particles within a certain range are screened out. Subsequently, the second discharge pipe 202 is moved below the filter plate 201, and the screened raw material is transported out through the second discharge pipe 202. Example 2

[0035] Refer to Figures 1-6 , which is the second embodiment of the present invention. The difference from the first embodiment is that it further includes a second inclined surface 101b formed by the inner diameter of the flared opening 101 gradually decreasing from top to bottom, and the suction plate 103 is located between the first inclined surface 102a and the second inclined surface 101b.

[0036] Among them, as Figure 1 shown, the flared opening 101 opens upward and expands outward continuously; thus, the second inclined surface 101b is formed, that is, the inner wall of the second inclined surface 101b gradually approaches the outer wall of the rotating disk 102. The advantage of such a design is that the raw material particles jump on the two inclined surfaces. When falling from the suction plate 103, the raw material particles will fall on the surface of the second inclined surface 101b again. Another advantage here is that the airflow will slow down the falling speed of the raw material particles, allowing the raw material particles to slide onto the surface of the filter plate 201 along the surface of the second inclined surface 101b as much as possible.

[0037] A sleeve 203 is provided at one end of the rotating disk 102 close to the filter plate 201, and a first slider 203a is provided on the outer wall of the sleeve 203; A second channel 201a through which the second discharge pipe 202 can slide is provided through the center position of the filter plate 201, and a second slider 201b that can contact the first slider 203a is provided on the end face of the filter plate 201.

[0038] Among them, a sleeve 203 is fixedly installed on the lower surface of the rotating disk 102, and the first sliders 203a are circumferentially arranged on the lower surface of the sleeve 203. The second sliders 201b are fixedly installed at the positions corresponding to the upper surface of the filter plate 201 below the first sliders 203a, that is, as Figure 4As shown, the first slider 203a has a semi-circular structure, and the second slider 201b has a convex hemispherical structure. That is, when the rotary disk 102 rotates, the semi-circular first slider 203a slides along the surface of the second slider 201b with a hemispherical structure, and then squeezes the filter plate 201 downward. When the first slider 203a disengages from the surface of the second slider 201b, the filter plate 201 resets by virtue of the toughness of the filter mesh. The first slider 203a continuously squeezes the second slider 201b, and the filter plate 201 begins to vibrate continuously, which can continuously move the raw material particles closer to the second discharge pipe 202. This process uses vibration to screen the raw material particles and can also transport the raw material particles screened by the filter plate 201 to the position of the second discharge pipe 202.

[0039] A fixing ring 204 is provided on the outer wall of the second discharge pipe 202, and a sliding rod 204a is provided on the outer wall of the fixing ring 204; A first moving groove 101c for the sliding rod 204a to slide is provided on the outer wall of the first discharge pipe 101a.

[0040] Among them, the fixing ring 204 is fixedly connected to the outer wall of the second discharge pipe 202, and the sliding rods 204a are circumferentially and arrayedly installed on the outer wall of the fixing ring 204, and the sliding rods 204a slide inside the first moving groove 101c; The advantage of such a design is that the second discharge pipe 202 will not rotate.

[0041] A first sliding groove 202a is provided on the inner wall of the second discharge pipe 202, a driving shaft 205 is provided inside the second discharge pipe 202, and a third slider 205a that can slide inside the first sliding groove 202a is provided on the outer wall of the driving shaft 205.

[0042] As Figure 7 , the developed view of the second discharge pipe 202, that is, the developed view of the first sliding groove 202a is wavy. When the driving shaft 205 rotates, the third slider 205a slides inside the first sliding groove 202a, and the third slider 205a will slide inside the first sliding groove 202a, causing the second discharge pipe 202 to move up and down; that is, when the driving shaft 205 rotates, the third slider 205a slides inside the first sliding groove 202a. When the third slider 205a slides from the lowest point of the first sliding groove 202a to the highest point of the first sliding groove 202a, the second discharge pipe 202 moves downward and will be lower than the filter plate 201, and the raw materials accumulated on the filter plate 201 will slide out from the second discharge pipe 202.

[0043] In summary, in this solution, the drive shaft 205 can be connected to the motor, and the motor is used to rotate the drive shaft 205. When filtration is required, the motor is used to move the second discharge pipe 202 above the filter plate 201 and into the sleeve 203. Subsequently, the motor drives the rotating disk 102 to rotate, and then the raw material particles are input into the bell mouth 101. While dust is removed, the first slider 203a under the rotating rotating disk 102 continuously presses the second slider 201b, causing the filter plate 201 to vibrate continuously to filter out smaller particles. When the filtration is completed, the motor is used to move the second discharge pipe 202 below the filter plate 201, and then the rotating disk 102 continues to rotate, causing the raw materials above the filter plate 201 to vibrate and enter the second discharge pipe 202. Embodiment 3

[0044] Referring to Figures 1-8 , which is the third embodiment of the present invention. The difference from the previous two embodiments is that one end of the drive shaft 205 extends into the sleeve 203.

[0045] An isolation plate 206 is provided inside the sleeve 203, and the drive shaft 205 passes through the isolation plate 206. A limit block 205b is provided on the outer wall of the upper end of the drive shaft 205 located on the isolation plate 206. A telescopic limiting member 207 is provided inside the sleeve 203.

[0046] Among them, the isolation plate 206 is fixed to the inner wall of the sleeve 203, and a space is formed between the upper inner wall of the sleeve 203 and the isolation plate 206. The drive shaft 205 extends into the space formed between the upper inner wall of the sleeve 203 and the isolation plate 206. At the same time, in this space, the limit block 205b is fixed to the outer wall of the drive shaft 205. Among them, the limit block 205b is as Figure 8As shown, its structure extends continuously outward from a point on the outer wall of the drive shaft 205 to form a first arc surface 205b-1; then a cross-section 205b-2 is formed with the outer wall of the drive shaft 205; a retractable limiting member 207 is provided inside the sleeve 203. Here, the main function of the limiting member 207 is to enable the drive shaft 205 to rotate unidirectionally. A one-way hinged rod can be used, and there is a torsion spring at the hinge. That is, when the sleeve 203 rotates, the cross-section 205b-2 pushes the hinged rod to rotate, causing the sleeve 203 to rotate, but the drive shaft 205 does not rotate; when the sleeve 203 rotates in reverse, when the one-way hinged rod abuts against the first arc surface 205b-1, it will push the drive shaft 205 to rotate together, thus realizing the unidirectional rotation of the drive shaft 205. The limiting member 207 can also be a combination of a spring and a support rod, allowing the support rod to slide along the first arc surface 205b-1. Thus, when the sleeve 203 rotates, it does not drive the drive shaft 205 to rotate. When rotating in reverse, the support rod will abut against the cross-section 205b-2 and push the drive shaft 205 to rotate. The advantage of such a design is that when the drive shaft 205 rotates, in cooperation with the transmission between the third slider 205a on the outer wall of the drive shaft 205 and the first chute 202a, the height of the second discharge pipe 202 can be appropriately adjusted, thereby adjusting the sliding of the raw materials from the second discharge pipe 202; when the drive shaft 205 does not rotate, the first slider 203a below the sleeve 203 starts to contact the second slider 201b, causing the raw materials on the surface of the filter plate 201 to continuously move towards the second discharge pipe 202. At the same time, continuous shaking can accelerate the screening of the raw materials by the filter plate 201.

[0047] The sleeve 203 is provided with a third channel 203b through which the limiting member 207 can slide. The limiting member 207 includes a limiting rod 207a that slides inside the third channel 203b. A limiting plate 207a-1 is provided at one end of the limiting rod 207a close to the inside. A first elastic member 207b is provided between the limiting plate 207a-1 and the inner wall of the sleeve 203.

[0048] Among them, the third channel 203b communicates the inside and outside of the sleeve 203. The limiting rod 207a slides along the inner wall of the third channel 203b. A limiting plate 207a-1 with a radius larger than that of the limiting rod 207a is fixedly installed at one end of the limiting rod 207a close to the inside. A first elastic member 207b is provided between the limiting plate 207a-1 and the inner wall of the sleeve 203. The first elastic member 207b is selected as a compression spring. That is, when the sleeve 203 rotates, the limiting plate 207a-1 slides along the first arc surface 205b-1 and does not drive the drive shaft 205 to rotate. At this time, the rotating disk 102 rotates, and the screening of the filter plate 201 can be realized. When the sleeve 203 rotates in reverse, the position of the second discharge pipe 202 can be adjusted by utilizing the characteristic that the third slider 205a slides inside the first chute 202a.

[0049] Threads are provided on the outer walls of both the first discharge pipe 101a and the second discharge pipe 202.

[0050] To better collect the sieved raw materials, threads are provided on the outer walls of both the first discharge pipe 101a and the second discharge pipe 202. The corresponding collection equipment is installed by screwing, which is simple and convenient to install and easy to disassemble and replace.

[0051] A support frame 301 is connected to the outer wall of the bell mouth 101, and the support frame 301 is in contact with the outer wall of the bell mouth 101.

[0052] Among them, the main function of the support frame 301 is to support the internal structure of the bell mouth 101, so that there is a certain space below the bell mouth 101, which is convenient for replacing the collection device. At the same time, the inner wall of the support frame 301 should be in contact with the outer wall of the bell mouth 101. The advantage of this design is that it can be considered not to weld the bell mouth 101 and the support frame 301. At the same time, the internal suction plate 103 can also be directly installed without welding. Ensure the replaceability of subsequent parts. Provide a certain operating space for a wider range of screening.

[0053] In summary, if only for dust removal, the second discharge pipe 202 can be moved below the filter plate 201, then the motor is started to drive the rotary disk 102 to rotate, and then the raw materials are added into the bell mouth 101 to remove dust from the raw materials.

[0054] If screening is required, replace the corresponding suction plate 103, and then install a suitable filter plate 201. Here, it should be noted that as shown in Figure 5 the rotary disk 102 has a support shaft inside, and the support shaft can be connected to an external motor to achieve drive; the motor can be fixed on the truss to ensure the overall operation of the equipment; at the same time, the suction plate 103 can be composed of two semi-circular structures. When disassembling, there is no need to consider the limitation of the rotary disk 102, or the motor output shaft and the support shaft are detachably connected, such as keyway connection, etc. Disassemble the motor, and then sleeved the complete suction plate 103 outside the rotary disk 102; after replacing the equipment, start the motor to start screening the raw material particles. The qualified ones are transported and collected by the second discharge pipe 202.

[0055] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., changes in the dimensions, scales, structures, shapes, and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as being integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number, or position of discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be altered or reordered according to alternative embodiments. In the claims, any "means-plus-function" clauses are intended to cover the structures that perform the recited functions herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Accordingly, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0056] In addition, to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the present invention or those features that are not relevant to the implementation of the present invention).

[0057] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development efforts will be a routine task of design, fabrication, and production without undue experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A raw material screening device for producing composite PET polyester film, characterized in that: include, A dust removal assembly (100) comprises a bell mouth (101), a first discharge pipe (101a) being provided at the bottom of the bell mouth (101), and a rotating disk (102) being arranged inside the bell mouth (101), wherein the rotating disk (102) comprises a first inclined surface (102a), and an air suction plate (103) being arranged between the bell mouth (101) and the rotating disk (102); The air intake plate (103) is provided with a first channel (103a) running through it, and the interior and the exterior of the air intake plate (103) are communicated via an air outlet (103b); The filter assembly (200) comprises a filter plate (201) arranged inside the bell mouth (101), and a second discharge pipe (202) arranged inside the bell mouth (101) and capable of moving up and down.

2. The raw material screening device for composite PET polyester film production according to claim 1, characterized in that: The inner diameter of the bell mouth (101) decreases from top to bottom to form a second inclined surface (101b), and the air suction plate (103) is located between the first inclined surface (102a) and the second inclined surface (101b).

3. The raw material screening device for producing composite PET polyester film according to claim 2, characterized in that: A sleeve (203) is provided at one end of the rotating disk (102) close to the filter plate (201), and a first sliding block (203a) is provided on the outer wall of the sleeve (203); A second channel (201a) is provided through the center of the filter plate (201) for the second discharge pipe (202) to slide, and a second sliding block (201b) that can contact the first sliding block (203a) is provided on the end surface of the filter plate (201).

4. The raw material screening device for producing composite PET polyester film according to claim 3, characterized in that: A fixing ring (204) is provided on the outer wall of the second discharge pipe (202), and a sliding rod (204a) is provided on the outer wall of the fixing ring (204); The outer wall of the first discharge pipe (101a) is provided with a first movable groove (101c) in which the sliding rod (204a) can slide.

5. The raw material screening device for producing composite PET polyester film according to claim 4, characterized in that: The inner wall of the second discharge pipe (202) is provided with a first slide groove (202a), the interior of the second discharge pipe (202) is provided with a drive shaft (205), and the outer wall of the drive shaft (205) is provided with a third sliding block (205a) that can slide along the interior of the first slide groove (202a).

6. The raw material screening device for producing composite PET polyester film according to claim 5, characterized in that: One end of the driving shaft (205) extends into the interior of the sleeve (203).

7. The raw material screening device for producing composite PET polyester film according to claim 6, characterized in that: An isolation plate (206) is provided inside the sleeve (203), and the drive shaft (205) passes through the isolation plate (206); a limit block (205b) is provided on the outer wall of the upper end of the drive shaft (205) located on the isolation plate (206); A retractable limiting member (207) is provided inside the sleeve (203).

8. The raw material screening device for producing composite PET polyester film according to claim 7, characterized in that: The sleeve (203) is penetrated by a third channel (203b) for the limiting member (207) to slide, and the limiting member (207) comprises a limiting rod (207a) that slides along the inside of the third channel (203b), a limiting plate (207a-1) is provided at one end of the limiting rod (207a) close to the inside, and a first elastic member (207b) is provided between the limiting plate (207a-1) and the inner wall of the sleeve (203).

9. The raw material screening device for producing composite PET polyester film according to claim 8, characterized in that: The outer walls of the first discharge pipe (101a) and the second discharge pipe (202) are both provided with threads.

10. The raw material screening device for producing composite PET polyester film according to claim 9, characterized in that: The outer wall of the bell mouth (101) is connected to a support frame (301), and the support frame (301) is in close contact with the outer wall of the bell mouth (101).

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