Dust removal device for a film laminating machine and apparatus

Abstract

The application provides a dust removal device for a film laminating machine and equipment thereof. The dust removal device for the film laminating machine comprises a discharging seat, a dust suction barrel and a rotating sealing plate. The discharging seat is provided with a discharging opening and a discharging cavity in communication. The dust suction barrel comprises a negative pressure dust suction cover, a filtering barrel and a filter screen. The negative pressure dust suction cover is provided with a dust suction cavity. The negative pressure dust suction cover is arranged on the filtering barrel. The filtering barrel is provided with a feeding cavity. The feeding cavity is used for being in communication with a feeding pipe of a suction mechanism, so as to convey plastic particles into the feeding cavity. The filter screen is arranged between the negative pressure dust suction cover and the filtering barrel. The dust suction cavity is in communication with the feeding cavity through the filter screen. The rotating sealing plate is located in the discharging cavity and is rotationally connected with the discharging seat. When the negative pressure dust suction cover works, the dust suction cavity and the feeding cavity form a negative pressure environment, so that the rotating sealing plate rotates and covers the discharging opening. When the negative pressure dust suction cover stops working, the dust suction cavity and the feeding cavity form an atmospheric pressure environment. The rotating sealing plate rotates and opens to a predetermined angle, so that the feeding cavity is in communication with the discharging cavity.

Description

Technical Field

[0001] This utility model relates to the technical field of release paper manufacturing equipment, and in particular to a dust removal device and equipment for a coating machine. Background Technology

[0002] A laminating machine, also known as an extrusion laminating machine, is a type of extrusion molding machinery. It utilizes the principle of extrusion casting: plastic particles are plasticized by a screw and then extruded in a linear fashion through a flat die. After stretching, they adhere to the surface of flexible substrates such as paper, film, non-woven fabric, and woven fabric. After cooling and shaping, they are pressed into a composite material that combines the barrier and heat-sealing properties of a plastic film layer with the strength and functional characteristics of the substrate.

[0003] In the production process of release paper, it is made by coating the surface of the base paper with plastic particles such as PE, PP, or PET to form a lamination coating. The lamination coating acts as a release layer and is commonly used in applications requiring non-stick properties, such as tapes and printing. Currently, existing lamination machines typically use a suction mechanism to automatically draw the plastic particles directly into the feeding tank before melting and heating them. However, this method easily melts and heats dust particles and other debris mixed in with the plastic particles, resulting in a lamination coating with numerous defects such as "black spots," "plastic particles," or uneven surfaces.

[0004] Therefore, how to perform dust removal operations at the front end of plastic particle feeding has become an essential research topic. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dust removal device and equipment for a coating machine that can achieve automatic dust collection and automatic feeding, and ensure the purity of plastic particles during the feeding process.

[0006] The objective of this utility model is achieved through the following technical solution: A dust removal device for a coating machine, located at the feed end of the feeding hopper of the coating machine, includes: The feeding seat has a connected feeding port and a feeding chamber. The feeding seat is detachably installed on the feeding end of the feeding tank of the coating machine. A dust collection bin includes a negative pressure dust collection cover, a filter media bin, and a filter screen. The negative pressure dust collection cover has a dust collection chamber and is placed on top of the filter media bin. The filter media bin has a feeding chamber that is connected to the feed pipe of the suction mechanism to transport plastic particles into the feeding chamber. The filter media bin is detachably connected to the discharge seat. The filter screen is located between the negative pressure dust collection cover and the filter media bin, and the dust collection chamber is connected to the feeding chamber through the filter screen. A rotating sealing plate is located inside the feeding chamber and is rotatably connected to the feeding seat. When the negative pressure dust suction cover is working, the dust suction chamber and the feeding chamber form a negative pressure environment, causing the rotating sealing plate to rotate and cover the feeding port. When the negative pressure dust suction cover stops working, the dust suction chamber and the feeding chamber form a chamber pressure environment, and the rotating sealing plate rotates and opens to a predetermined angle, so that the feeding chamber and the feeding chamber are connected.

[0007] In one embodiment, the negative pressure suction cover is provided with a negative pressure tube, one end of which is connected to the suction chamber, and the other end of which is used to connect to the negative pressure suction system.

[0008] In one embodiment, the side wall of the filter media barrel is provided with a feeding pipe that communicates with the feeding chamber, and the end of the feeding pipe away from the filter media barrel is connected to the conveying pipe of the suction mechanism.

[0009] In one embodiment, the negative pressure dust collection cover is detachably connected to the filter media canister.

[0010] In one embodiment, the filter screen has a plurality of filter holes, the diameter of which is smaller than the diameter of the plastic particles.

[0011] In one embodiment, the filter screen is a one-piece molded plastic structure.

[0012] In one embodiment, the material feeding seat has a protruding material feeding tube at the lower end of the material feeding port. The material feeding tube extends into the material feeding cavity, and the end of the material feeding tube facing away from the material feeding port forms an inclined end face. The rotating sealing plate rotates and covers the inclined end face.

[0013] In one embodiment, the rotating sealing plate is provided with a rotating shaft, and the first end and the second end of the rotating shaft respectively rotatably pass through the feeding seat; The first end of the rotating shaft is provided with a first limiting part, and the second end of the rotating shaft is provided with a second limiting part, which is detachably connected to the rotating shaft.

[0014] In one embodiment, the dust removal device for the coating machine further includes a solenoid valve body, which is disposed on the outer wall of the feeding seat; The first end of the rotating shaft extends to form a bent portion, and a gravity block is fitted on the bent portion. The bent portion extends away from the rotating sealing plate with the rotating shaft as the central axis, so that the bent portion and the rotating sealing plate form a preset angle. The solenoid valve body is used to drive the second end of the rotating shaft to rotate over a short distance, so that the rotating sealing plate rotates and opens to a predetermined angle.

[0015] A dust removal device for a coating machine, characterized in that it includes a negative pressure dust collection system and the dust removal device for a coating machine as described in any of the above embodiments.

[0016] Compared with the prior art, the present invention has at least the following advantages: When the negative pressure dust collection cover is working, it utilizes the principle of negative pressure to create a negative pressure environment in the dust collection chamber and the feeding chamber. This causes the rotating cover of the rotating sealing plate to be positioned at the discharge port. At this time, the feeding chamber and the discharge chamber are not connected. Thus, while the conveying pipe of the suction mechanism transports plastic particles into the feeding chamber, the negative pressure dust collection cover continues to work, filtering the plastic particles into the feeding chamber through the filter screen. Dust particles and other debris are drawn into the dust collection chamber through the filter screen, thereby filtering the dust particles and other debris from the plastic particles. Conversely, when the negative pressure dust collection cover stops working, the dust collection chamber and the feeding chamber return to a normal pressure environment. The rotating sealing plate rotates and opens to a predetermined angle under the action of gravity, connecting the feeding chamber and the discharge chamber. This allows the plastic particles to enter the feeding end of the feeding hopper of the coating machine through the discharge port and the discharge chamber, thus completing the feeding of the coating machine. The dust removal device for the coating machine of this utility model can achieve automatic dust collection and automatic feeding by adding a dust removal device to the feeding end of the feeding hopper of the coating machine. This ensures the purity of plastic particles during the feeding process and effectively avoids defects such as "black spots", "plastic particles" or unevenness in the coating obtained after coating. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the dust removal device used in a coating machine in one embodiment; Figure 2 for Figure 1 The diagram shows the structure of the dust removal device used in the coating machine. Figure 3 for Figure 1 A cross-sectional view of the dust removal device used in the coating machine shown. Figure 4 for Figure 1 A partial structural schematic diagram of the dust removal device used in the coating machine is shown.

[0019] Reference numerals: Dust removal device 10 for coating machine; feeding seat 100; feeding port 101; feeding chamber 102; feeding pipe 110; inclined end face 1110; dust collection bucket 200; negative pressure dust collection cover 210; dust collection chamber 2101; negative pressure pipe 2110; filter material bucket 220; feeding chamber 2201; feeding pipe 2210; filter screen 230; filter hole 2301; rotating sealing plate 300; rotating shaft 310; first limiting part 3110; second limiting part 3120; bending part 3130; gravity block 3140; solenoid valve body 400. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] This disclosure provides a dust removal device for a coating machine, disposed at the inlet end of the feeding hopper of the coating machine. The dust removal device includes a feeding seat, a dust collection bucket, and a rotating sealing plate. The feeding seat has a connected discharge port and a discharge chamber, and is detachably installed at the inlet end of the feeding hopper of the coating machine. The dust collection bucket includes a negative pressure dust collection cover, a filter media bucket, and a filter screen. The negative pressure dust collection cover has a dust collection chamber and is placed on the filter media bucket. The filter media bucket has an inlet chamber, which is connected to the conveying pipe of the suction mechanism to convey plastic particles into the inlet chamber. The filter media bucket is detachably connected to the feeding seat. The filter screen is disposed on the... Between the negative pressure dust collection cover and the filter media canister, the dust collection chamber is connected to the feed chamber through the filter screen; the rotating sealing plate is located in the discharge chamber and is rotatably connected to the discharge seat. When the negative pressure dust collection cover is working, the dust collection chamber and the feed chamber form a negative pressure environment, causing the rotating sealing plate to rotate and cover the discharge port; when the negative pressure dust collection cover stops working, the dust collection chamber and the feed chamber form a chamber pressure environment, and the rotating sealing plate rotates and opens to a predetermined angle, so that the feed chamber and the discharge chamber are connected.

[0024] Please see Figures 1 to 4 To better understand the dust removal device 10 for the coating machine of this application, the following further explanation of the dust removal device 10 for the coating machine is provided: In one embodiment, a dust removal device 10 for a coating machine is provided at the feeding end of the feeding hopper of the coating machine. The dust removal device 10 for the coating machine includes a feeding seat 100, a dust collection hopper 200, and a rotating sealing plate 300. The feeding seat 100 has a connected discharge port 101 and a feeding chamber 102. The feeding seat 100 is detachably installed on the feeding end of the feeding tank of the coating machine. The dust collection tank 200 includes a negative pressure dust collection cover 210, a filter tank 220, and a filter screen 230. The negative pressure dust collection cover 210 has a dust collection chamber 2101 and covers the filter tank 220. The filter tank 220 has a feeding chamber 2201, which is connected to the conveying pipe of the suction mechanism (not shown) to convey plastic particles into the feeding chamber 2201. The filter tank 220 is detachably connected to the feeding seat 100. The filter screen 230 is located on... Between the negative pressure dust collection cover 210 and the filter media tank 220, the dust collection chamber 2101 is connected to the feed chamber 2201 through the filter screen 230; the rotating sealing plate 300 is located in the discharge chamber 102 and is rotatably connected to the discharge seat 100. When the negative pressure dust collection cover 210 is working, the dust collection chamber 2101 and the feed chamber 2201 form a negative pressure environment, so that the rotating sealing plate 300 rotates and covers the discharge port 101; when the negative pressure dust collection cover 210 is not working, the dust collection chamber 2101 and the feed chamber 2201 form a chamber pressure environment, and the rotating sealing plate 300 rotates and opens to a predetermined angle, so that the feed chamber 2201 is connected to the discharge chamber 102.

[0025] In this embodiment, when the negative pressure dust collection cover 210 is working, it utilizes the principle of negative pressure to create a negative pressure environment in the dust collection chamber 2101 and the feeding chamber 2201, thereby causing the rotating sealing plate 300 to rotate and cover the material discharge port 101. At this time, the feeding chamber 2201 and the discharge chamber 102 cannot communicate. Thus, while the conveying pipe of the suction mechanism transports plastic particles into the feeding chamber 2201, the negative pressure dust collection cover 210 continues to work, filtering the plastic particles into the feeding chamber 2201 through the filter screen 230, while dust particles and other debris are filtered out. The material is drawn into the suction chamber 2101 through the filter screen 230, thereby filtering out dust particles and other debris impurities from the plastic particles. Conversely, when the negative pressure suction cover 210 stops working, the suction chamber 2101 and the feeding chamber 2201 return to their original pressure environment. The rotating sealing plate 300 rotates open to a predetermined angle under the action of gravity, connecting the feeding chamber 2201 with the discharge chamber 102. This allows the plastic particles to enter the feeding end of the coating machine's feeding hopper through the discharge port 101 and the discharge chamber 102, thus completing the feeding of the coating machine. The dust removal device 10 for the coating machine of this utility model, by adding a dust removal device to the feeding end of the coating machine's feeding hopper, can achieve automatic dust collection and automatic feeding, ensuring the purity of the plastic particles during the feeding process and effectively avoiding defects such as "black spots," "plastic particles," or unevenness in the coating obtained after coating.

[0026] like Figure 1 and Figure 3 As shown, in one embodiment, the negative pressure suction cover 210 is provided with a negative pressure pipe 2110. One end of the negative pressure pipe 2110 is connected to the suction chamber 2101, and the other end of the negative pressure pipe 2110 is used to connect to a negative pressure suction system (not shown). Thus, the negative pressure suction system performs negative pressure suction on the suction chamber 2101 and the feeding chamber 2201, thereby creating a negative pressure environment in both the suction chamber 2101 and the feeding chamber 2201.

[0027] like Figure 1 and Figure 3 As shown, in one embodiment, the side wall of the filter media tank 220 is provided with a feeding pipe 2210 communicating with the feeding chamber 2201. One end of the feeding pipe 2210, away from the filter media tank 220, is connected to the conveying pipe of the suction mechanism. Thus, plastic particles are conveyed into the feeding chamber 2201 through the communication between the conveying pipe and the feeding pipe 2210 of the external suction mechanism. It should be noted that because the dust particles and other debris mixed in with the plastic particles are relatively light and small in size compared to the plastic particles, these particles can pass through the filter screen 230 and enter the suction chamber 2101, while the plastic particles fall to the bottom of the feeding chamber 2201 and accumulate.

[0028] like Figures 1 to 3As shown, in one embodiment, the negative pressure dust collection cover 210 is detachably connected to the filter media canister 220. This facilitates opening the negative pressure dust collection cover 210 to remove the filter screen 230 for cleaning or replacement. Specifically, in this embodiment, the negative pressure dust collection cover 210 and the filter media canister 220 are connected by fasteners or screws.

[0029] like Figure 3 As shown, in one embodiment, the filter screen 230 has a plurality of filter holes 2301, the diameter of which is smaller than the diameter of the plastic particles. This prevents the plastic particles from passing through the filter holes 2301, thereby filtering out dust particles and other debris impurities mixed in with the plastic particles.

[0030] like Figures 1 to 3 As shown, in one embodiment, the filter screen 230 is a one-piece molded plastic structure. This gives the filter screen 230 a certain degree of plastic elasticity, allowing the outer periphery of the negative pressure dust collection cover 210 to abut and press against the outer ring of the filter screen 230 when the cover is placed on the filter media container 220. This results in a better sealing effect when the cover is placed on the filter media container 220, ensuring the formation of a negative pressure environment.

[0031] like Figures 1 to 4 As shown, in one embodiment, the material feeding seat 100 is provided with a material feeding pipe 110 protruding from the lower end of the material feeding port 101. The material feeding pipe 110 extends into the material feeding cavity 102, and the end of the material feeding pipe 110 facing away from the material feeding port 101 forms an inclined end face 1110. The rotating sealing plate 300 is rotatably covered on the inclined end face 1110.

[0032] It is understood that in this embodiment, by extending the discharge pipe 110 at the lower end of the discharge port 101 and setting the lower end of the discharge pipe 110 as an inclined end face 1110, when the rotating sealing plate 300 is rotated and covered on the inclined end face 1110, the rotating sealing plate 300 is in an inclined state. Thus, when the plastic particles gradually accumulate in the discharge pipe 110 and the feeding chamber 2201 to reach a certain weight, the negative pressure dust suction cover 210 stops working, the dust suction chamber 2101 and the feeding chamber 2201 return to the room pressure environment, and the rotating sealing plate 300 can be easily rotated and opened to a predetermined angle by gravity, so that the feeding chamber 2201 and the discharge chamber 102 are connected, thereby achieving the purpose of discharging, so that the plastic particles flow through the discharge pipe 110 sequentially through the discharge chamber 102 and the feeding bucket.

[0033] like Figures 1 to 4As shown, in one embodiment, the rotating sealing plate 300 is provided with a rotating shaft 310, and the first end and the second end of the rotating shaft 310 respectively rotatably pass through the unloading seat 100; wherein, the first end of the rotating shaft 310 is provided with a first limiting part 3110, and the second end of the rotating shaft 310 is provided with a second limiting part 3120, and the second limiting part 3120 is detachably connected to the rotating shaft 310. In this way, the accuracy of the rotating sealing plate 300 rotating and covering the inclined end face 1110 is ensured by the first limiting part 3110 and the second limiting part 3120, so that the first limiting part 3110 and the second limiting part 3120 are both located on the outer side wall of the unloading seat 100, thereby restricting the lateral movement of the rotating shaft 310. Specifically, in this embodiment, the second limiting part 3120 is threadedly connected to the second end of the rotating shaft 310, which facilitates the disassembly and assembly of the rotating shaft 310.

[0034] like Figures 1 to 4 As shown, in one embodiment, the dust removal device 10 for the coating machine further includes an electromagnetic valve body 400, which is disposed on the outer wall of the feeding seat 100; the first end of the rotating shaft 310 extends to form a bent portion 3130, and a gravity block 3140 is sleeved on the bent portion 3130. The bent portion 3130 extends about the side away from the rotating sealing plate 300 with the rotating shaft 310 as the central axis, so that the bent portion 3130 and the rotating sealing plate 300 form a preset angle. The electromagnetic valve body 400 is used to drive the second end of the rotating shaft 310 to rotate over a short distance, so that the rotating sealing plate 300 rotates and opens to a predetermined angle.

[0035] It is understood that in this embodiment, by adding a gravity block 3140 on the bent portion 3130, and positioning the rotating sealing plate 300 and the gravity block 3140 on opposite sides of the rotating shaft 310, the rotating shaft 310 is rotated using the lever principle, with the rotating shaft 310 as the center of rotation. The downward force exerted by the gravity block 3140 causes the rotating shaft 310 to rotate, causing the rotating sealing plate 300 to rotate and cover the inclined end face 1110, thereby closing the discharge pipe 110. Thus, when the negative pressure dust collection cover 210 is working, the negative pressure principle creates a negative pressure environment in the dust collection chamber 2101 and the feeding chamber 2201. Simultaneously, the addition of the gravity block 3140 assists in driving the rotating sealing plate 300 to rotate and cover the inclined end face 1110, effectively preventing the rotating shaft 310 from accidentally jamming.

[0036] Specifically, when plastic particles gradually accumulate in the discharge pipe 110 and the feeding chamber 2201 to reach a certain weight, the negative pressure dust suction cover 210 stops working, and the dust suction chamber 2101 and the feeding chamber 2201 restore the chamber pressure environment. The second end of the rotating shaft 310 is driven to rotate by the solenoid valve body 400 over a short distance. That is, the solenoid valve body 400 is used to assist in driving the rotating sealing plate 300 to rotate and open to a predetermined angle, thereby ensuring that the rotating sealing plate 300 can open the discharge pipe 110. This can avoid the problem that the rotating sealing plate 300 cannot open automatically under the action of gravity because the plastic particles in the feeding chamber 2201 or the discharge pipe 110 are too tightly packed and there is still a negative pressure.

[0037] It should be noted that the rotating sealing plate 300 is a thin sheet structure, and the weight of the gravity block 3140 is greater than the weight of the rotating sealing plate 300, so that the gravity block 3140 can move downward around the rotating shaft 310, thereby driving the rotating sealing plate 300 to move upward around the rotating shaft 310, thus assisting in driving the rotating sealing plate 300 to rotate and cover the inclined end face 1110.

[0038] It should also be noted that the structural principle and control method of the solenoid valve body 400 driving the second end of the rotating shaft 310 to rotate and open the rotating sealing plate 300 to a predetermined angle are existing technologies and will not be described in detail here. This application only protects the connection and positional relationship of each component.

[0039] This application also provides a dust removal device for a coating machine, including the dust removal device 10 for a coating machine described in any of the above embodiments.

[0040] In this embodiment, the dust removal equipment used in the coating machine adopts the dust removal device for the coating machine described above. By adding a dust removal device at the feeding end of the feeding hopper of the coating machine, automatic dust collection and automatic feeding can be achieved, ensuring the purity of plastic particles during the feeding process. This effectively avoids defects such as "black spots", "plastic particles" or unevenness in the coating obtained after coating, thereby better meeting the requirements for appearance quality, smoothness and flatness of the release paper surface.

[0041] Compared with the prior art, the present invention has at least the following advantages: When the negative pressure dust collection cover is working, it utilizes the principle of negative pressure to create a negative pressure environment in the dust collection chamber and the feeding chamber. This causes the rotating cover of the rotating sealing plate to be positioned at the discharge port. At this time, the feeding chamber and the discharge chamber are not connected. Thus, while the conveying pipe of the suction mechanism transports plastic particles into the feeding chamber, the negative pressure dust collection cover continues to work, filtering the plastic particles into the feeding chamber through the filter screen. Dust particles and other debris are drawn into the dust collection chamber through the filter screen, thereby filtering the dust particles and other debris from the plastic particles. Conversely, when the negative pressure dust collection cover stops working, the dust collection chamber and the feeding chamber return to a normal pressure environment. The rotating sealing plate rotates and opens to a predetermined angle under the action of gravity, connecting the feeding chamber and the discharge chamber. This allows the plastic particles to enter the feeding end of the feeding hopper of the coating machine through the discharge port and the discharge chamber, thus completing the feeding of the coating machine. The dust removal device for the coating machine of this utility model can achieve automatic dust collection and automatic feeding by adding a dust removal device to the feeding end of the feeding hopper of the coating machine. This ensures the purity of plastic particles during the feeding process and effectively avoids defects such as "black spots", "plastic particles" or unevenness in the coating obtained after coating.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dust removal device for a coating machine, located at the feed end of the feeding hopper of the coating machine, characterized in that, include: The feeding seat has a connected feeding port and a feeding chamber. The feeding seat is detachably installed on the feeding end of the feeding tank of the coating machine. A dust collection bin includes a negative pressure dust collection cover, a filter media bin, and a filter screen. The negative pressure dust collection cover has a dust collection chamber and is placed on top of the filter media bin. The filter media bin has a feeding chamber that is connected to the feed pipe of the suction mechanism to transport plastic particles into the feeding chamber. The filter media bin is detachably connected to the discharge seat. The filter screen is located between the negative pressure dust collection cover and the filter media bin, and the dust collection chamber is connected to the feeding chamber through the filter screen. A rotating sealing plate is located inside the feeding chamber and is rotatably connected to the feeding seat. When the negative pressure dust suction cover is working, the dust suction chamber and the feeding chamber form a negative pressure environment, causing the rotating sealing plate to rotate and cover the feeding port. When the negative pressure dust suction cover stops working, the dust suction chamber and the feeding chamber form a chamber pressure environment, and the rotating sealing plate rotates and opens to a predetermined angle, so that the feeding chamber and the feeding chamber are connected.

2. The dust removal device for the coating machine according to claim 1, characterized in that, The negative pressure dust collection cover is equipped with a negative pressure tube, one end of which is connected to the dust collection chamber, and the other end of which is used to connect to the negative pressure dust collection system.

3. The dust removal device for the coating machine according to claim 1, characterized in that, The filter media barrel has a feeding pipe on its side wall that communicates with the feeding chamber, and the end of the feeding pipe away from the filter media barrel is connected to the conveying pipe of the suction mechanism.

4. The dust removal device for the coating machine according to claim 1, characterized in that, The negative pressure dust collection cover is detachably connected to the filter media canister.

5. The dust removal device for a coating machine according to claim 1, characterized in that, The filter screen has multiple filter holes, and the diameter of each filter hole is smaller than the diameter of the plastic particles.

6. The dust removal device for a coating machine according to claim 5, characterized in that, The filter screen is a one-piece molded plastic structure.

7. The dust removal device for a coating machine according to claim 1, characterized in that, The material feeding seat has a protruding material feeding tube at the lower end of the material feeding port. The material feeding tube extends into the material feeding cavity, and the end of the material feeding tube facing away from the material feeding port forms an inclined end face. The rotating sealing plate rotates and covers the inclined end face.

8. The dust removal device for a coating machine according to claim 7, characterized in that, The rotating sealing plate is provided with a rotating shaft, and the first end and the second end of the rotating shaft respectively rotatably pass through the feeding seat; The first end of the rotating shaft is provided with a first limiting part, and the second end of the rotating shaft is provided with a second limiting part, which is detachably connected to the rotating shaft.

9. The dust removal device for a coating machine according to claim 8, characterized in that, The dust removal device for the coating machine also includes an electromagnetic valve body, which is disposed on the outer wall of the feeding seat; The first end of the rotating shaft extends to form a bent portion, and a gravity block is fitted on the bent portion. The bent portion extends away from the rotating sealing plate with the rotating shaft as the central axis, so that the bent portion and the rotating sealing plate form a preset angle. The solenoid valve body is used to drive the second end of the rotating shaft to rotate over a short distance, so that the rotating sealing plate rotates and opens to a predetermined angle.

10. A dust removal device for a coating machine, characterized in that, Includes a negative pressure dust collection system and a dust removal device for a coating machine according to any one of claims 1 to 9.

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