A powder spraying apparatus

Abstract

The application relates to the field of film processing, in particular to a powder spraying device which comprises a powder spraying pipe and a powder pumping component for sending powder to the powder spraying pipe; wherein the powder spraying pipe comprises a pipe body connected to the powder pumping component and used for receiving powder, a plurality of powder outlet holes are arranged on the circumferential surface of the pipe body, a powder scattering unit is arranged at a position corresponding to the powder outlet hole on the circumferential surface of the pipe body and used for scattering powder, and a wind resistance sheet is rotatably arranged on the pipe body along the axis direction of the powder outlet hole, one end of the wind resistance sheet extends to the powder outlet hole, and a recess and a protrusion are respectively formed on a group of opposite sides of the wind resistance sheet along the axis direction of the wind resistance sheet. The application has the effects of improving the uneven powder scattering of the existing film powder spraying and improving the powder coating quality of the film.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of film processing, in particular to a powder spraying device. BACKGROUND

[0002] In the production and processing of plastic film, in order to prevent the plastic film from sticking during the conveying process, dry powder such as talc powder is coated on the surface of the plastic film to act as a release agent to prevent sticking. In order to make the talc powder on the surface of the plastic film evenly and effectively coated, manual coating is usually used in the operation process, which seriously wastes human resources and reduces production efficiency.

[0003] To solve the problem of low efficiency of manual powdering and waste of human resources, some related technologies provide an automatic powdering method, that is, a powder hopper is arranged above the conveying path of the film, a powder outlet is formed on the lower side of the powder hopper, a net rack is fixed horizontally within a certain distance below the powder outlet, and a scraper capable of reciprocating along the length or width direction of the net rack is arranged on the net rack. When the powder in the powder hopper falls onto the net rack, the reciprocating scraper spreads the powder on the net rack and makes the powder fall from the net rack, so as to be sprayed onto the film in the conveying process, thereby achieving powder coating on the surface of the film.

[0004] However, after using this method for a period of time, the following problems are found:

[0005] First, the powder is easy to block the mesh holes of the net rack, so that the powder is difficult to fall evenly from the net rack, resulting in uneven powdering and affecting the powdering quality.

[0006] Second, the powder accumulated below the mesh holes will automatically fall due to its own weight when the accumulated powder is too much and the weight is too large, falling onto the film being conveyed below, thereby causing the formation of powder blocks on the film, still resulting in uneven powdering and affecting the powdering quality.

[0007] Therefore, there is an urgent need to provide a new film surface powder spraying scheme. SUMMARY

[0008] In order to improve the problem of uneven powdering of the existing film powdering device, which affects the film powdering quality, the present application provides a powder spraying device.

[0009] The powder spraying device provided by the present application adopts the following technical scheme:

[0010] A powder spraying device, comprising a powder spraying pipe and a powder feeding component for feeding powder to the powder spraying pipe;

[0011] The powder spraying pipe comprises:

[0012] A tube body connected to the powder pumping component for receiving powder, a plurality of powder outlet holes are arranged on the circumferential surface of the tube body;

[0013] A powder scattering unit arranged at a position corresponding to the powder outlet hole on the circumferential surface of the tube body for scattering powder;

[0014] A wind resistance sheet rotatably arranged on the tube body along the axis direction of the powder outlet hole, one end of the wind resistance sheet extends to the powder outlet hole, and a recess and a protrusion are respectively formed on a group of opposite sides of the wind resistance sheet along the axis direction thereof.

[0015] By adopting the above technical scheme, when in use, the powder spraying tube is placed on either side of the film conveying line, the powder scattering unit faces the film, and then the wind resistance sheet is rotated so that the recess of the wind resistance sheet faces the powder inlet direction of the tube body. At this time, the powder is pumped into the tube body by the powder pumping component, and when the powder meets the wind resistance sheet, part of the powder enters the powder outlet hole along the recess of the wind resistance sheet, and then the powder is uniformly scattered on the film by the powder scattering unit. When it is necessary to adjust the powder output of the powder scattering unit, the wind resistance sheet is rotated to adjust the direction of the recess of the wind resistance sheet, so that the amount of powder entering the powder outlet hole is reduced, thereby reducing the powder spraying amount of the powder outlet hole. When it is necessary to stop the powder output of any powder outlet hole, the wind resistance sheet is rotated so that the protrusion of the wind resistance sheet faces the powder inlet direction of the tube body. When the powder is blown to the position of the wind resistance sheet, the powder will flow to the rear position along the protrusion of the wind resistance sheet, thereby avoiding the powder from entering the powder outlet hole corresponding to the wind resistance sheet, achieving the stop of the powder output of the powder outlet hole, and meeting the requirements of different scenes.

[0016] Optionally, the powder scattering unit comprises:

[0017] A powder spraying sleeve rotatably arranged on the tube body along the axis direction of the powder outlet hole;

[0018] A plurality of powder outlet holes are arranged on the circumferential surface of the powder spraying sleeve.

[0019] By adopting the above technical scheme, the direction of the powder outlet hole can be adjusted by rotating the powder spraying sleeve, so that the powder entering the powder spraying sleeve through the powder outlet hole is uniformly sprayed to the appropriate film position.

[0020] Optionally, an adjusting rod is rotatably arranged on the side of the tube body away from the powder scattering unit, the adjusting rod extends into the tube body and is fixed to the wind resistance sheet.

[0021] By adopting the above technical scheme, when in use, the adjusting rod is rotated to drive the wind resistance sheet to rotate, so that the amount of powder entering each powder outlet hole can be adjusted, thereby facilitating the adjustment of the powder spraying amount of different powder scattering units.

[0022] Optionally, the powder spraying device further comprises a powder spraying box, and the powder spraying box is provided with a film passing port on each of the opposite sides thereof for the film to pass through.

[0023] The powder spraying pipe is located on the upper or lower side of the corresponding membrane penetration port inside the powder spraying box;

[0024] The powder spraying box is equipped with a negative pressure air vent on its upper side, which is used to remove powder that has not adhered to the film surface.

[0025] By adopting the above technical solution, during operation, the film is conveyed into the powder spraying box. After the film enters the powder spraying box, the powder sprayed from the powder spraying pipe will be evenly dispersed in the box. Then, some of it will be adsorbed onto the surface of the film to achieve powder coating. The remaining powder that is not adsorbed onto the surface of the film will be sucked away by the negative pressure air vent to avoid excessive powder. The entire powder coating process of the film is completed in the box, which not only achieves uniform powder coating of the film, but also avoids powder spillage into the working environment and pollution and waste.

[0026] Optionally, the powder pumping component includes:

[0027] Powder pump with a built-in cavity for storing powder;

[0028] The air inlet is located at the lower end of the powder pump and is used to deliver compressed gas.

[0029] A fluidizing plate is placed on the upper side of the air inlet inside the powder pump to disperse compressed gas.

[0030] The powder inlet is located on the upper side of the fluidizing plate and is used to feed powder into the powder pump.

[0031] A microporous plate is installed on the upper side of the powder inlet inside the powder pump to filter powder.

[0032] The powder outlet is located at the top of the powder pump and connected to the powder spraying pipe.

[0033] By adopting the above technical solution, during operation, compressed gas enters the powder pump from the lower end of the pump body. After entering the powder pump, the compressed gas will move directly upward through the fluidizing plate. The compressed gas dispersed by the fluidizing plate will blow the powder on the upper side of the fluidizing plate upward evenly. The rising powder will pass through the microporous plate again for filtration. In this process, the powder with smaller particle size rises and finally enters the powder spraying pipe through the powder outlet, while the powder with larger particle size will be blocked by the microporous plate, so that the texture of the powder entering the powder spraying pipe is uniform.

[0034] Optionally, the powder pumping component further includes:

[0035] The negative pressure inlet is located on the upper side of the microporous plate and connected to the negative pressure air outlet of the powder spraying box.

[0036] By adopting the above technical solution, the negative pressure inlet is set to recover the powder sucked out of the powder spraying box, and to further disperse the powder on the upper side of the microporous plate, so that the powder can enter the powder outlet evenly.

[0037] Optionally, the powder pumping component comprises:

[0038] a first powder pipe vertically arranged on the upper side of the powder pump and connected to the powder pump;

[0039] a second powder pipe horizontally arranged on the upper end of the first powder pipe, and the powder outlet is located in the second powder pipe;

[0040] a first gas pipe horizontally arranged on the opposite side of the first powder pipe and used for conveying compressed gas.

[0041] By adopting the above technical scheme, when working, the powder in the powder pump will enter the second powder pipe from the first powder pipe and then be sent to the powder spraying pipe from the powder outlet. The first gas pipe arranged can supplement the powder in the second powder pipe with gas, so as to ensure the gas pressure and make the powder quickly enter the powder spraying pipe, thereby ensuring the completion of the powder spraying operation.

[0042] Optionally, the powder pumping component comprises:

[0043] a second gas pipe vertically arranged on the upper end of the first powder pipe and used for conveying compressed gas.

[0044] By adopting the above technical scheme, when the powder in the second powder pipe is blocked, the second gas pipe can be opened to instantaneously increase the gas pressure in the second powder pipe, so as to break through the crowded powder in the second powder pipe, thereby solving the powder blocking problem in the second powder pipe.

[0045] Optionally, the powder pump is provided with a heat source bulb corresponding to the position of the powder inlet of the powder pump and used for drying the powder.

[0046] By adopting the above technical scheme, on the one hand, the powder entering the powder pump can be heated, and on the other hand, the temperature is prevented from being too high or the heat source from contacting the powder, so as to prevent the powder sprayed from the powder spraying pipe from being too high to damage the film.

[0047] Optionally, the powder pump is provided with a dismounting opening corresponding to one side of the fluidization plate and the microporous plate; and the fluidization plate and the microporous plate are detachably arranged in the powder pump.

[0048] By adopting the above technical scheme, the detachable fluidization plate and microporous plate can be taken out from the dismounting opening after a period of time, so as to clean the powder accumulated on the surface of the fluidization plate and the microporous plate, thereby ensuring the normal operation of the powder pump.

[0049] In summary, the present application has at least one of the following beneficial technical effects:

[0050] When in use, the powder spraying tube is placed on either side of the film conveying line, with the powder scattering unit facing the film, and then the wind resistance sheet is turned so that the concave part of the wind resistance sheet faces the powder inlet direction of the tube. At this time, the powder is pumped into the tube by the powder pumping component, and when the powder meets the wind resistance sheet, part of the powder enters the powder outlet hole along the concave part of the wind resistance sheet, and then passes through the powder scattering unit, so that the powder is quickly and uniformly dispersed on the film. When it is necessary to adjust the powder outlet amount of the powder scattering unit, the wind resistance sheet is turned to adjust the direction of the concave part of the wind resistance sheet, so that the amount of powder entering the powder outlet hole is reduced, thereby reducing the powder spraying amount of the powder outlet hole. When it is necessary to stop the powder outlet of any powder outlet hole, the wind resistance sheet is turned so that the convex part of the wind resistance sheet faces the powder inlet direction of the tube. When the powder is blown to the position of the wind resistance sheet, the powder will quickly flow to the rear position along the convex part of the wind resistance sheet, thereby avoiding the powder from entering the powder outlet hole corresponding to the wind resistance sheet, achieving the stop of the powder outlet of the powder outlet hole, and meeting the requirements of different scenes.

[0051] By turning the powder spraying sleeve, the direction of the powder spraying hole can be adjusted, so that the powder entering the powder spraying sleeve through the powder spraying hole is uniformly sprayed on the appropriate film position.

[0052] When in use, the film enters the powder spraying box along the conveying, and when the film enters the powder spraying box, the powder sprayed by the powder spraying tube will be uniformly dispersed in the box, and then part of the powder will be adsorbed on the surface of the film to realize the powder coating of the film. The remaining more powder that is not adsorbed on the surface of the film will be sucked away by the negative pressure air port, so as to avoid too much powder and realize the completion of the powder coating process of the entire film in the box, thereby achieving the uniform powder coating of the film and avoiding the pollution and waste caused by the overflow of the powder in the working environment. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a front view of a powder spraying device in an embodiment of the present application;

[0054] Figure 2 is a schematic view of a powder pump structure of a powder spraying device in an embodiment of the present application;

[0055] Figure 3 is a schematic view of a powder pump structure of a powder spraying device in another embodiment of the present application;

[0056] Figure 4 is a schematic view of a first installation position of a drying component of a powder spraying device in an embodiment of the present application;

[0057] Figure 5 is a schematic view of another installation position of a drying component of a powder spraying device in another embodiment of the present application;

[0058] Figure 6 is a structural schematic view of a powder scattering unit of a powder spraying device in an embodiment of the present application;

[0059] Figure 7 is a structural schematic diagram of a powder scattering unit of a powder spraying device in another embodiment of the present application;

[0060] Figure 8 is an exploded schematic diagram of a powder spraying sleeve structure of a powder spraying device in an embodiment of the present application;

[0061] Figure 9 is a schematic diagram of a powder spraying sleeve cross-sectional structure of a powder spraying device in an embodiment of the present application;

[0062] Figure 10 is an exploded schematic diagram of an adjusting rod structure of a powder spraying device in an embodiment of the present application;

[0063] Figure 11 is a schematic diagram of a powder spraying tube structure of a powder spraying device in an embodiment of the present application;

[0064] Figure 12 is a schematic diagram of a powder spraying box structure of a powder spraying device in an embodiment of the present application.

[0065] BRIEF DESCRIPTION OF THE DRAWINGS: 1, powder spraying tube; 11, tube body; 111, connecting ring; 112, arc-shaped slot; 113, first tube body; 114, second tube body; 12, powder outlet hole; 13, multi-hole arc plate; 14, powder spraying sleeve; 141, powder spraying hole; 142, concave ring; 143, stop ring; 144, limiting column; 15, wind resistance sheet; 151, supporting column; 16, adjusting rod; 161, positioning hole; 17, convex ring; 171, screw; 172, cavity; 173, positioning plate; 174, positioning arc sheet; 17, negative pressure inlet; 2, powder pump; 21, air inlet; 22, fluidization plate; 23, powder inlet; 231, powder cup; 24, micro-hole plate; 25, first powder tube; 251, second powder tube; 252, first air tube; 253, second air tube; 26, dismounting port; 261, cover; 262, insertion slot; 27, heat source bulb; 3, powder spraying box; 31, membrane penetrating port; 32, negative pressure air inlet. DETAILED DESCRIPTION

[0066] The following will be described in detail with reference to the accompanying drawings. Figures 1-12 The present application will be further described in detail.

[0067] Embodiments of the present application disclose a powder spraying device.

[0068] Reference will be made to Figure 1 A powder spraying device includes a powder pumping component and a powder spraying tube 1. The powder pumping component is used to pump powder into the powder spraying tube 1, and the powder spraying tube 1 is used to spray the powder to the surface of a film.

[0069] Reference will be made to Figure 2Specifically, the powder pumping component comprises a powder pump 2, which is in a vertical barrel shape and has an internal cavity. A gas inlet 21 is formed at the lower end of the circumferential surface of the powder pump 2, and is used to connect a compressed gas delivery device so as to deliver compressed gas into the powder pump 2.

[0070] With reference to Figure 2 A fluidizing plate 22 is horizontally fixed at the upper side of the powder pump 2 corresponding to the gas inlet 21. An inlet 23 is formed at the upper side of the circumferential surface of the powder pump 2 corresponding to the fluidizing plate 22, and can be connected to a powder cup 231 to fill the powder pump 2 with powder. When the compressed gas enters the powder pump 2 from the lower side, it is first processed by the fluidizing plate 22 to disperse the gas flow, and then is blown to the powder above the fluidizing plate 22 to uniformly disperse and blow the powder upward.

[0071] With reference to Figure 2 A microporous plate 24 is horizontally fixed at the upper side of the powder pump 2 corresponding to the inlet 23. The microporous plate 24 is uniformly provided with micropores, and the pore size of the micropores can be set according to different practical requirements. In this embodiment, the microporous plate 24 is set as a 300-mesh filter plate.

[0072] With reference to Figure 2 When the compressed gas blows the powder upward to the microporous plate 24, the powder with a particle size not greater than 300 microns will pass through the microporous plate 24 to rise, and the powder with a particle size greater than 300 microns will be blocked by the microporous plate 24 at the lower side of the microporous plate 24, so that the powder with a uniform particle size rises to the upper side of the microporous plate 24.

[0073] With reference to Figure 1 and Figure 2 A first powder pipe 25 is rotatably connected to the upper end of the powder pump 2 and is vertically arranged. The lower end of the first powder pipe 25 is in communication with the powder pump 2. A second powder pipe 251 is fixed to the upper end of the first powder pipe 25 and is horizontally arranged. One end of the second powder pipe 251 is in communication with the first powder pipe 25, and the other end of the second powder pipe 251 is an outlet for communication with the powder spraying pipe 1. A first gas pipe 252 is fixed to the upper end of the second powder pipe 251 and is horizontally arranged away from one side of the second powder pipe 251. The first gas pipe 252 is used to input compressed gas. A second gas pipe 253 is vertically fixed to the upper end of the second powder pipe 251, and the lower end of the second gas pipe 253 is in communication with the first powder pipe 25.

[0074] When working, the powder in the powder pump 2 will enter the second powder pipe 251 from the first powder pipe 25 and then be sent to the powder spraying pipe 1 from the powder outlet, the first air pipe 252 arranged can supplement air to the powder entering the second powder pipe 251, so as to ensure the air pressure and make the powder quickly enter the powder spraying pipe 1, and ensure the completion of the powder spraying work. When the powder in the second powder pipe 251 is blocked, the second air pipe 253 can be opened to instantaneously increase the air pressure in the second powder pipe 251, so as to break through the crowded powder in the second powder pipe 251, and solve the powder blocking in the second powder pipe 251.

[0075] With reference to Figure 1 In order to realize the control of the compressed gas inlet, the air inlet 21 of the pump body, the first air pipe 252 and the second air pipe 253 can be connected with a compressed gas source, and then the air inlet 21 of the pump body, the first air pipe 252 and the second air pipe 253 are respectively provided with solenoid valves for realizing the adjustment, closing and opening of the amount of the compressed gas entering.

[0076] With reference to Figure 3 In addition, in order to facilitate the replacement and cleaning of the microporous plate 24 and the fluidization plate 22 in the powder pump 2, the positions corresponding to the microporous plate 24 and the fluidization plate 22 on the circumferential surface of the powder pump 2 are respectively provided with a dismounting opening 26 and a cover 261 for closing the dismounting opening 26. The cover 261 can be connected with the powder pump 2 by means of bolt connection, clamping connection, plug connection or the combination of the above connection modes. The positions corresponding to the microporous plate 24 and the fluidization plate 22 on the inner circumferential surface of the powder pump 2 are respectively formed with a slot 262. In use, the cover 261 is opened, the fluidization plate 22 and the microporous plate 24 are respectively inserted into the corresponding slots 262 in the powder pump 2, and then the cover 261 is closed, so that the microporous plate 24 and the fluidization plate 22 can be installed. The reverse operation can be performed when the microporous plate 24 and the fluidization plate 22 are dismounted, so that the microporous plate 24 and the fluidization plate 22 can be conveniently installed and dismounted for cleaning and replacement.

[0077] In order to avoid the powder entering the powder pump 2 from being damp, a drying component can be further arranged to dry the powder. Two specific embodiments are described below.

[0078] With reference to Figure 4 The first kind is that the drying component directly uses a heat source bulb 27. The heat source bulb 27 can be selected according to the requirement, and the heat source bulb 27 is arranged between the fluidization plate 22 and the microporous plate 24 in the powder pump 2. The heat source bulb 27 is powered on to dry the powder by means of the heat of the heat source bulb 27.

[0079] With reference to Figure 5The second is that the drying part includes a heat source bulb 27 installed in the powder cup 231. The heat source bulb 27 can be selected according to requirements. The powder is stored in the powder cup 231 before entering the powder pump 2, and then the powder in the powder cup 231 is dried by the heat source bulb 27 before entering the powder pump 2, so as to achieve the drying of the powder.

[0080] In this way, by setting the heat source bulb 27 as the heating source for powder drying, on the one hand, the powder entering the powder pump 2 can be heated, and on the other hand, the temperature is prevented from being too high or the heat source from contacting the powder, which can cause the powder sprayed from the powder spraying pipe 1 to excessively damage the film.

[0081] Referring to Figure 1 and Figure 6 The powder spraying pipe 1 includes a pipe body 11. The pipe body 11 can be arranged on at least one side of the film conveying path according to the film conveying path, that is, when single-sided powder spraying is required, the pipe body 11 can be arranged on the side of the film for powder spraying, and when double-sided powder spraying is required, two pipe bodies 11 can be arranged on the two sides of the film.

[0082] Referring to Figure 6 A plurality of powder outlet holes 12 are arranged on the surface of the powder spraying pipe 1 in the axial direction of the powder spraying pipe 1, and the axes of the powder outlet holes 12 are perpendicular to the axial direction of the powder spraying pipe 1. The positions corresponding to the powder outlet holes 12 of the powder spraying pipe 1 are each provided with a powder scattering unit for realizing powder scattering after the powder outlet holes 12 spray powder, so that the powder is uniformly sprayed on the surface of the film.

[0083] In this embodiment, the powder scattering unit can be directly fixed to the outer side of the surface of the powder spraying pipe 1 corresponding to the powder outlet holes 12 by using a plurality of hole arc plates 13, so that the powder entering the powder outlet holes 12 is dispersed again by the hole arc plates 13.

[0084] Referring to Figure 7 In addition, the powder scattering unit can also adopt a powder spraying sleeve 14. The powder spraying sleeve 14 is rotatably connected to the positions of the surface of the powder spraying pipe 1 corresponding to the powder outlet holes 12. The powder spraying sleeve 14 is coaxially arranged with the powder outlet holes 12. A plurality of powder spraying holes 141 are arranged on the surface of the powder spraying sleeve 14. The powder spraying holes 141 can be arranged on one side of the surface of the powder spraying sleeve 14. At this time, the powder spraying pipe 1 can be arranged on one side of the film for single-sided powder spraying on the surface of the film. In addition, the plurality of powder spraying holes 141 can also be arranged on opposite sides of the surface of the powder spraying sleeve 14. At this time, the powder spraying pipe 1 is arranged between the two films, and the two films on the same side can be simultaneously sprayed.

[0085] In order to realize the rotation limiting of the powder spraying sleeve 14 and the pipe body 11, the following solutions can be further adopted:

[0086] Referring to Figure 8 and Figure 9, the outer circumferential surface of the pipe body 11 is protrudedly formed with a connecting ring 111 at the position corresponding to the powder spraying sleeve 14, the outer circumferential surface of the connecting ring 111 is uniformly provided with a plurality of arc-shaped grooves 112, the center lines of the arc-shaped grooves 112 are arranged along the axial direction of the connecting ring 111. The inner circumferential surface of the powder spraying sleeve 14 is formed with a concave ring 142, the concave ring 142 is arranged in the inner circumferential surface of the powder spraying sleeve 14 and is provided with an elastic stop ring 143, the stop ring 143 comprises a first arc-shaped piece unit protruding towards the axial direction and a second arc-shaped piece unit protruding away from the axial direction, the first arc-shaped piece unit and the second arc-shaped piece unit are arranged in a spaced manner, and the first arc-shaped piece unit is adapted to the arc-shaped groove 112 on the outer circumferential surface of the connecting ring 111. The concave ring 142 of the powder spraying sleeve 14 is fixed with a limiting column 144 at the arc-shaped opening position corresponding to the second arc-shaped piece unit of the stop ring 143, and the limiting column 144 can limit the rotation of the stop ring 143 relative to the powder spraying sleeve 14.

[0087] Referring to Figure 8 and Figure 9 In use, the first arc-shaped piece unit of the stop ring 143 is adapted to the arc-shaped groove 112 on the outer circumferential surface of the connecting ring 111, which can limit the rotation of the powder spraying sleeve 14 relative to the pipe body 11. When it is necessary to adjust the angle of the powder spraying hole 141, the powder spraying sleeve 14 is rotated, and the powder spraying sleeve 14 is forced to rotate relative to the pipe body 11. Since the stop ring 143 is an elastic ring, the stop ring 143 deforms under force, so that the first arc-shaped piece unit of the stop ring 143 is separated from the corresponding arc-shaped groove 112, and the powder spraying sleeve 14 can be smoothly rotated. When the appropriate angle is reached, the powder spraying sleeve 14 is loosened, and the stop ring 143 recovers to the original state due to its own elasticity, so that the first arc-shaped piece unit is inserted into the corresponding arc-shaped groove 112, and the angle adjustment of the powder spraying sleeve 14 relative to the pipe body 11 is completed.

[0088] Referring to Figure 6 and Figure 7 In order to adjust the powder spraying pipe 1, so that the powder can enter into each powder spraying hole 141, the pipe body 11 is rotatably provided with a wind resistance piece 15 at the position corresponding to each powder spraying hole 141, the wind resistance piece 15 is arranged along the axial direction of the powder spraying hole 141, one side of the wind resistance piece 15 is formed as a recess along the axial direction, and the side of the wind resistance piece 15 opposite to the recess is formed as a protrusion along the axial direction. For example, the cross section of the wind resistance piece 15 can be arc-shaped or V-shaped, and in this embodiment, the wind resistance piece 15 is taken as an arc-shaped plate for illustration, the outer diameter of the arc-shaped plate is the same as the inner diameter of the powder spraying hole 141, and the arc length of the arc-shaped plate is half of the whole circumference. The side of the pipe body 11 away from the powder scattering unit is also rotatably provided with an adjusting rod 16, and the adjusting rod 16 extends into the pipe body 11 and is fixed to one end of the wind resistance piece 15.

[0089] Referring to Figure 6 and Figure 7, so that when in use, the powder spraying pipe 1 is placed on either side of the film conveying line, the powder scattering unit is directed towards the film, and then the adjusting rod 16 is rotated to rotate the wind resistance sheet 15, so that the recessed part of the wind resistance sheet 15 is directed towards the powder inlet direction of the pipe body 11, the amount of powder entering each powder spraying hole 141 can be adjusted, at this time, the powder is pumped into the pipe body 11 by the powder pumping component, and when the powder encounters the wind resistance sheet 15, part of the powder enters the powder outlet hole 12 along the recess of the wind resistance sheet 15, and then passes through the powder scattering unit, so that the powder is quickly and uniformly dispersed on the film. When it is necessary to adjust the powder outlet amount of the powder scattering unit, the wind resistance sheet 15 is rotated to adjust the direction of the recessed part of the wind resistance sheet 15, so that the amount of powder entering the powder outlet hole 12 is reduced, thereby reducing the powder spraying amount of the powder outlet hole 12. When it is necessary to stop the powder outlet of any powder outlet hole 12, the wind resistance sheet 15 is rotated so that the protruding part of the wind resistance sheet 15 is directed towards the powder inlet direction of the pipe body 11, and when the powder is blown to the position of the wind resistance sheet 15, the powder will quickly flow to the rear position along the protruding part of the wind resistance sheet 15, thereby avoiding the powder entering the powder outlet hole 12 corresponding to the wind resistance sheet 15, achieving the stop of the powder outlet of the powder outlet hole 12, and meeting the requirements of different scenes.

[0090] To facilitate the relative position limitation of the adjusting rod 16 relative to the pipe body 11, a locking structure can be further provided, which is specifically as follows:

[0091] Referring to Figure 10 , one end of the wind resistance sheet 15 is formed with a support column 151 having the same diameter as the diameter of the whole circle of the arc-shaped plate of the wind resistance sheet 15, the adjusting rod 16 is fixed at the axial position of the support column 151, and the diameter of the adjusting rod 16 is smaller than the diameter of the support column 151. The locking structure includes a convex ring 17, one end of the inner hole of the convex ring 17 has the same diameter as the diameter of the support column 151, which is adapted to the support column 151, and the other end of the inner hole of the convex ring 17 has the same diameter as the diameter of the adjusting rod 16, which is adapted to the adjusting rod 16. Screws 171 are provided on both sides of the convex ring 17, and the ends of the screws 171 are threadedly connected to the pipe body 11, so that the support column 151 and the adjusting rod 16 are connected to the pipe body 11 through the convex ring 17, and the position of the wind resistance sheet 15 is limited.

[0092] Referring to Figure 10, the convex ring 17 is provided with a cavity 172 corresponding to the position of the adjusting rod 16, the surface of the adjusting rod 16 is provided with a plurality of positioning holes 161 corresponding to the position of the cavity 172, the cavity 172 of the convex ring 17 is provided with two elastic positioning plates 173, the two positioning plates 173 are symmetrically arranged with the center line of the adjusting rod 16 as the center, one end of the positioning plate 173 is fixed to the inner wall of the convex ring 17, and the other end of the positioning plate 173 is fixed with a positioning arc piece 174, which is used to adapt to the positioning hole 161, so that in the normal state, the positioning arc piece 174 can be inserted into the positioning hole 161, limiting the rotation of the adjusting rod 16 relative to the convex ring 17, thereby realizing the positioning of the wind resistance piece 15 in the powder spraying pipe 1, limiting the rotation thereof, when it is necessary to adjust the angle of the wind resistance piece 15, the adjusting rod 16 is rotated by force, so that the positioning arc piece 174 can be separated from the wind resistance piece 15 of the adjusting rod 16 through the elastic deformation of the positioning plate 173, so as to realize the rotation of the wind resistance piece 15, when the adjustment is completed, the positioning plate 173 can restore the original state through its own elasticity, and the positioning arc piece 174 is inserted into the corresponding positioning hole 161, so as to complete the positioning of the adjusting rod 16, and the rotation of the wind resistance piece 15 is limited again.

[0093] In order to facilitate the replacement of part of the wind resistance piece 15, the following settings can be further made,

[0094] Referring to Figure 11 , the pipe body 11 includes a first pipe body 113 and a second pipe body 114, the connection mode of the second pipe body 114 and the first pipe body 113 can adopt sealing screw connection or sealing bolt connection, etc., the first pipe body 113 is a connecting pipe for connecting the powder spraying component and the second pipe body 114, and the wind resistance piece 15, the powder scattering unit and the adjusting rod 16 are arranged in the second pipe body 114, so that the second pipe body 114 is formed as an independent adjusting unit, thereby achieving independent replacement of each adjusting unit to meet different needs.

[0095] In addition, in order to reduce the waste of powder in the powder spraying process and the cleanliness of the environment, a powder spraying box 3 can also be arranged in the conveying path of the film. The following will be described in further detail.

[0096] Referring to Figure 12 , the powder spraying box 3 is horizontally arranged, and the relative two sides are provided with film penetrating ports 31, the film penetrating ports 31 on the relative two sides of the powder spraying box 3 are a group of film penetrating ports 31, according to the number of films required to pass through, a plurality of groups of film penetrating ports 31 can also be arranged, such as two groups, three groups or more groups.

[0097] Referring to Figure 12The powder spraying box 3 is arranged on the conveying path of the film, the film passing holes 31 of each group are used for the film to pass through, and the powder spraying pipes 1 are arranged in the powder spraying box 3 and correspond to the upper sides or lower sides of the film passing holes 31 of each group. The powder spraying pipes 1 can be arranged in different ways according to the positions of the film to be sprayed with powder. For example, only one side of the film can be sprayed with powder, the powder spraying pipe 1 with a one-way powder scattering unit can be directly arranged on the side of the film to be sprayed with powder. Both sides of the film can be sprayed with powder, two powder spraying pipes 1 with one-way powder scattering units can be arranged on both sides of the film. The adjacent sides of the adjacent films can be sprayed with powder, the powder spraying pipe 1 with a two-way powder scattering unit can be arranged between the adjacent films, so that the two films can be simultaneously sprayed with powder.

[0098] With reference to Figure 12 The upper side of the powder spraying box 3 is provided with a negative pressure air port 32, and the powder pump 2 is provided with a negative pressure inlet 18 corresponding to the upper side of the microporous plate 24. The negative pressure air port 32 and the negative pressure inlet 18 are communicated through a pipeline.

[0099] In operation, the film enters the powder spraying box 3 through the film passing holes 31. When the film enters the powder spraying box 3, the powder sprayed from the powder spraying pipes 1 is uniformly dispersed in the box, and then part of the powder is adsorbed on the surface of the film to realize the powder coating of the film. The rest of the powder that is not adsorbed on the surface of the film is sucked away by the negative pressure air port 32, so that the powder coating process of the whole film is completed in the box, the uniform powder coating of the film is realized, and the powder is prevented from overflowing in the working environment to cause pollution and waste. Through the negative pressure effect of the powder pump 2, the powder sucked out of the powder spraying box 3 can be recycled through the negative pressure inlet 18 of the powder pump 2, and the powder on the upper side of the microporous plate 24 can be further dispersed to make the powder uniformly enter the powder outlet.

[0100] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent changes made according to the structure, shape and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A powder spraying apparatus, characterized by, The application relates to a powder spraying pipe (1) and a powder feeding component for feeding powder to the powder spraying pipe (1); wherein the powder spraying pipe (1) comprises: a pipe body (11) connected to the powder feeding component and used for receiving powder, a plurality of powder outlet holes (12) arranged on the circumferential surface of the pipe body (11); a powder scattering unit arranged at a position corresponding to the powder outlet holes (12) on the circumferential surface of the pipe body (11) and used for scattering powder; and a wind resistance sheet (15) rotatably arranged on the pipe body (11) along the axis direction of the powder outlet holes (12), one end of the wind resistance sheet (15) extending to the powder outlet holes (12), and a group of opposite sides of the wind resistance sheet (15) respectively shaped with recessed parts and protruding parts along the axis direction thereof. One end of the wind resistance sheet (15) is shaped with a support column (151) with the same diameter as the diameter of the whole circle of the arc-shaped plate of the wind resistance sheet (15), an adjusting rod (16) is fixed at the axis position of the support column (151), and the diameter of the adjusting rod (16) is smaller than the diameter of the support column (151); the locking structure comprises a convex ring (17), the inner hole of the convex ring (17) has the same diameter as the diameter of the support column (151) at one end and is used for matching the support column (151), and the inner hole of the convex ring (17) has the same diameter as the diameter of the adjusting rod (16) at the other end and is used for matching the adjusting rod (16); screws (171) are arranged on the two sides of the convex ring (17), and the end portions of the screws (171) are threadedly connected to the pipe body (11), so that the support column (151) and the adjusting rod (16) are connected to the pipe body (11) through the convex ring (17), and the position of the wind resistance sheet (15) is limited. The position corresponding to the adjusting rod (16) of the convex ring (17) is also provided with a cavity (172), the circumferential surface of the adjusting rod (16) is shaped with a plurality of positioning holes (161) at the position corresponding to the cavity (172), the cavity (172) of the convex ring (17) is provided with two elastic positioning plates (173), the two positioning plates (173) are symmetrically arranged with the center line of the adjusting rod (16) as the center, one end of each of the positioning plates (173) is fixed to the inner wall of the convex ring (17), the other end of each of the positioning plates (173) is fixed with a positioning arc sheet (174), and the positioning arc sheet (174) is used for matching the positioning hole (161), so that the positioning arc sheet (174) can be inserted into the positioning hole (161) in a normal state, the rotation of the adjusting rod (16) relative to the convex ring (17) is limited, the positioning of the wind resistance sheet (15) in the powder spraying pipe (1) is realized, and the rotation of the wind resistance sheet (15) is limited; when the angle of the wind resistance sheet (15) needs to be adjusted, the adjusting rod (16) is rotated with force, so that the positioning arc sheet (174) is separated from the wind resistance sheet (15) of the adjusting rod (16) through the elastic deformation of the positioning plate (173), the rotation of the wind resistance sheet (15) is realized, and when the adjustment is completed, the positioning plate (173) can restore the original state through the elasticity thereof, the positioning arc sheet (174) is inserted into the corresponding positioning hole (161), the positioning of the adjusting rod (16) is completed, and the rotation of the wind resistance sheet (15) is limited again.

2. A duster according to claim 1, characterised in that: The powder scattering unit comprises: a powder spraying sleeve (14) rotatably arranged on the pipe body (11) along the axial direction of the powder spraying hole (141); and a plurality of powder spraying holes (141) formed on the circumferential surface of the powder spraying sleeve (14).

3. A duster according to claim 1, wherein: An adjusting rod (16) is rotatably arranged on the side of the pipe body (11) away from the powder scattering unit, and the adjusting rod (16) extends into the pipe body (11) and is fixed to the wind resistance sheet (15).

4. A duster according to claim 1, wherein The powder spraying box (3) is further provided with a film passing port (31) on each of the opposite sides of the powder spraying box (3) for the film to pass through; the powder spraying pipe (1) is arranged in the powder spraying box (3) on the upper side or the lower side corresponding to the film passing port (31); and the upper side of the powder spraying box (3) is provided with a negative pressure air inlet (32) for sucking away the powder not adhered to the surface of the film.

5. A duster according to claim 4, wherein, The powder pumping component comprises: a powder pump (2) with an internal cavity for storing powder; an air inlet (21) arranged at the lower end of the powder pump (2) for conveying compressed gas; a fluidization plate (22) arranged in the powder pump (2) on the upper side corresponding to the air inlet (21) for dispersing the compressed gas; a powder inlet (23) arranged on the upper side of the fluidization plate (22) for feeding the powder into the powder pump (2); a microporous plate (24) arranged in the powder pump (2) on the upper side corresponding to the powder inlet (23) for filtering the powder; and a powder outlet arranged at the upper end of the powder pump (2) and connected to the powder spraying pipe (1).

6. A duster according to claim 5, wherein, The powder pumping component further comprises: a negative pressure inlet (18) arranged on the upper side of the microporous plate (24) and connected to the negative pressure air inlet (32) of the powder spraying box (3).

7. A duster according to claim 5, wherein, The powder pumping component comprises: a first powder pipe (25) vertically arranged on the upper side of the powder pump (2) and connected to the powder pump (2); a second powder pipe (251) horizontally arranged at the upper end of the first powder pipe (25), wherein the powder outlet is located in the second powder pipe (251); and a first gas pipe (252) horizontally arranged on the opposite side of the first powder pipe (25) for conveying compressed gas.

8. A duster according to claim 7, wherein, The powder pumping component comprises: a second gas pipe (253) vertically arranged at the upper end of the first powder pipe (25) for conveying compressed gas.

9. A duster according to claim 5 wherein: The powder pump (2) is provided with a heat source bulb (27) at the position corresponding to the powder inlet (23) of the powder pump (2) for drying the powder.

10. A duster according to claim 5 wherein: The powder pump (2) is provided with a dismounting port (26) on one side of the fluidization plate (22) and the microporous plate (24); and the fluidization plate (22) and the microporous plate (24) are detachably arranged in the powder pump (2).

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