Electrostatic powder spraying device for aluminum profile

Abstract

The invention discloses an electrostatic powder spraying device for an aluminum profile, and relates to the technical field of electrostatic powder spraying. The device comprises a shell, an adjusting assembly and a lifting assembly are arranged in the shell, and the lifting assembly is located over the adjusting assembly; the adjusting assembly comprises a bottom plate arranged in the shell, the edge position of the top of the bottom plate is fixedly connected with the bottom face of the atomizing cylinder, the top face of the atomizing cylinder is fixedly connected with the inner side face of the edge position of the top of the shell, and a first cavity is formed between the atomizing cylinder and the shell and used for conveying preliminarily atomized powder; a mounting ring is further fixedly mounted at the top of the bottom plate, a circle of rubber extrusion film is mounted at the top of the mounting ring, and a second cavity is formed between the rubber extrusion film and the atomization barrel. The powder output quantity is changed while the voltage is changed, and the powder ion speed can be reduced by lowering the voltage of the powder spraying device, so that the rebound phenomenon of spraying on the surface of a workpiece is reduced, and the shielding effect of powder spraying is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrostatic powder spraying, and particularly relates to an electrostatic powder spraying device for aluminum profiles. Background Art

[0002] When coating the surface of aluminum profiles, the electrostatic powder spraying technology is usually used. Electrostatic spraying utilizes the principle of high-voltage electrostatic corona electric field. The metal deflector cup on the spray gun head is connected to a high-voltage negative electricity, and the workpiece to be coated is grounded to form a positive electrode. A strong electrostatic field is formed between the spray gun and the workpiece. When the carrier gas (compressed air) transports the powder coating from the powder supply barrel to the deflector cup of the spray gun through the powder delivery pipe, dense charges are generated around it, and the powder becomes negatively charged. Under the action of electrostatic force and compressed air, the powder is evenly adsorbed on the workpiece and then becomes a uniform, continuous, flat, and smooth coating film after heating and powder melting and curing (or plasticizing); Electrostatic powder spraying has the advantages of high spraying efficiency, high coating utilization rate, and good coating quality.

[0003] Currently, when electrostatic powder spraying the surface of aluminum profiles, due to the presence of bending surfaces on the surface of some aluminum profiles, the bending groove positions are prone to poor spraying effects due to the Faraday shielding effect, thus affecting the spraying effect. Traditional electrostatic powder spraying uses a manually held spray gun for operation, and the distance between the spray gun and the workpiece cannot be adjusted appropriately according to the spraying position of the workpiece, resulting in uneven spraying of the aluminum profile workpiece during spraying.

[0004] The existing aluminum profile powder spraying device has problems such as difficult powder adhesion in the bending groove positions of aluminum profiles due to the Faraday shielding effect, and at the same time, the distance during workpiece spraying and the powder spraying amount cannot be adjusted appropriately according to different workpiece spraying positions. Therefore, the present invention provides an electrostatic powder spraying device for aluminum profiles. Summary of the Invention

[0005] The purpose of the present invention is to provide an electrostatic powder spraying device for aluminum profiles, which solves the problems that the existing aluminum profile powder spraying device has difficult powder adhesion in the bending groove positions of aluminum profiles due to the Faraday shielding effect, and at the same time, the distance during workpiece spraying cannot be adjusted appropriately according to different workpiece spraying positions.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: The present invention is an electrostatic powder spraying device for aluminum profiles, including a housing. An adjustment component and a lifting component are arranged inside the housing. The lifting component is located directly above the adjustment component. The housing serves as an external protection component of the electrostatic powder spraying device and plays a role in protecting the internal components. The adjusting assembly includes a bottom plate disposed inside the housing. The top edge of the bottom plate is fixedly connected to the bottom surface of the atomizing cylinder. The top surface of the atomizing cylinder is fixedly connected to the inner side surface of the top edge of the housing. A first cavity is formed between the atomizing cylinder and the housing for conveying the preliminarily atomized powder. A mounting ring is also fixedly installed on the top of the bottom plate. A rubber extrusion film is installed on the top of the mounting ring. A second cavity is formed between the rubber extrusion film and the atomizing cylinder. The second cavity is used to adjust the powder output. Three extrusion rings are arranged on the top inner side surface of the mounting ring. The three extrusion rings are stacked upward in sequence, and the extrusion rings are movably connected through wedge-shaped grooves. Four electromagnets are equally spaced on the inner side surface of each extrusion ring. The bottom plate is used to support the adjusting assembly and the lifting assembly. The atomizing cylinder is used to further atomize the preliminarily atomized powder to prevent the powder from being incompletely atomized and caking during the spraying process. The mounting ring is used to install and support the rubber extrusion film and the extrusion rings on the top. The mounting ring supports the bottom of the first extrusion ring and plays a supporting role. The rubber extrusion film, as a rubber film, generates an outward expansion force when being pushed upward by the extrusion rings, thereby squeezing the volume of the second cavity. When the volume of the second cavity decreases, the amount of powder output from the second cavity per unit time will become less. The electromagnets are used to adsorb the bar when energized. According to the magnitude of the voltage, when the voltage is high, the bar is stretched to a long length. When the bar rotates, it directly abuts against the bottom of the electromagnet of the first extrusion ring. When the voltage decreases, the stretching length of the bar decreases, and the rotational movement of the bar will skip the first extrusion ring and thus abut against the bottom of the electromagnet of the second extrusion ring or the third extrusion ring. The lifting assembly includes a threaded rod disposed inside the installation cavity surrounded by the rubber extrusion film. Four movable blocks are arranged in an array on the circumferential side surface of the threaded rod. A plurality of teeth are arranged on the outer surface of each movable block and are threadedly connected to the threaded rod. A nut is also arranged on the movable block and is also movably connected to the threaded rod. A bar is arranged at the bottom of the movable block. The bar is made of metal and is adsorbed to the electromagnet arranged on the inner side of the extrusion ring when the electromagnet is energized. The threaded rod rotates under the drive of a micro motor, thereby driving the movable block engaged with it through the teeth to rotate around the pin shaft to one side of the threaded rod. When the movable block rotates a certain angle, the nut installed on its surface just rotates to the angle engaged with the threaded rod. Therefore, when the threaded rod continues to rotate, it drives the movable block to move upward.

[0007] Preferably, four connecting blocks are arranged on the inner side surface of the housing, and each connecting block is connected to the bottom outer side surface of the atomizing cylinder. An installation hole is opened at the bottom of the housing, and a connecting flange is welded on the installation hole. The connecting flange is used to connect the pipeline for supplying powder.

[0008] Preferably, a round hole is formed in the top of the outer shell, a first telescopic tube is welded to the inner wall of the round hole, a second telescopic tube is slidably sleeved on the inner wall of the first telescopic tube, a third telescopic tube is slidably sleeved on the inner wall of the second telescopic tube, and a telescopic spray head is slidably sleeved on the inner wall of the third telescopic tube; the three telescopic tubes can be raised simultaneously, and the telescopic spray head is used for spraying powder outward for workpiece spraying.

[0009] Preferably, the three pressing rings include a first pressing ring, a second pressing ring and a third pressing ring. The first pressing ring, the second pressing ring and the third pressing ring are stacked from bottom to top in sequence, and the inner diameters decrease in sequence; annular protrusions are arranged on the tops of the first pressing ring and the second pressing ring, and annular grooves are arranged on the bottoms of the second pressing ring and the third pressing ring. The annular protrusions on the tops of the first pressing ring and the second pressing ring are respectively arranged inside the annular grooves on the bottoms of the second pressing ring and the third pressing ring; the voltages applied to the electromagnets arranged on the inner walls of the pressing rings change with the control voltage of the electrostatic powder spraying device. That is, when the control voltage of the electrostatic powder spraying device decreases, the energizing voltage of the electromagnet decreases.

[0010] Preferably, a micro motor is welded to the center of the top of the bottom plate, and the output end of the top of the micro motor is fixedly connected to the bottom end of the threaded rod; the threaded rod is located at the center of the installation cavity surrounded by the rubber extrusion film. A cover plate is installed on the top of the rubber extrusion film, and four through holes are formed in the cover plate. A connecting rod is slidably arranged inside each through hole, and the tops of the four connecting rods are all installed on the inner top wall of the telescopic spray head.

[0011] Preferably, an activity hole is formed in each movable block, and a pin shaft is installed inside each activity hole. The adjacent heads and tails of the four pin shafts are fixedly connected by an installation block, and the four pin shafts enclose a rectangle; the top of each installation block is fixedly connected to the bottom end of a connecting rod. The connecting rods move upward simultaneously driven by the upward movement of the bottom movable block, thereby pushing the telescopic spray head and the three telescopic tubes connected thereto to rise upward, so as to change the distance between the telescopic spray head and the workpiece spraying.

[0012] Preferably, a sleeve is welded to the bottom of each movable block, an elastic member is arranged inside the sleeve, the bottom end of the elastic member is welded to the top of the strip, and the strip is movably arranged inside the sleeve; two-thirds of the length of the strip contracts inside the sleeve in the non-energized state of the electromagnet. At this time, the elastic member is in the normal state without being stressed. When the electromagnet is energized, the elastic member is pulled by the strip and is in the stressed and stretched state.

[0013] Preferably, the four strips respectively correspond to the electromagnets on the inner walls of the pressing rings. When the strip is in motion, it is located at the bottom of the electromagnet and lifts the electromagnet and the pressing ring where the electromagnet is installed upward.

[0014] Preferably, the installation cavity surrounded by the rubber extrusion film is in the shape of a frustum of a cone with a smaller upper part and a larger lower part, and the rubber extrusion film is expanded outwards during the upward movement of the extrusion ring. At this time, the volume of the second cavity between the rubber extrusion film and the atomizing cylinder decreases.

[0015] The present invention has the following beneficial effects: By setting the lifting component in the present invention, when the aluminum profile workpiece needs to be sprayed, the preliminarily atomized powder is introduced into the interior of the first chamber. The powder atomized again by the atomizing cylinder enters the interior of the second cavity, and finally the powder is sprayed on the surface of the aluminum profile workpiece by the telescopic nozzle. When spraying the bent groove position of the aluminum profile, the control voltage of the powder spraying device is reduced, and at the same time, the energizing voltage of the electromagnet decreases. The micro motor is started to drive the threaded rod to rotate, thereby driving the movable block engaged with it through the teeth to rotate around the pin shaft to one side of the threaded rod. When the movable block rotates a certain angle, the nut installed on its surface just rotates to the angle engaged with the threaded rod. Therefore, when the threaded rod continues to rotate, it drives the movable block to move upward; the connecting rod moves upward at the same time driven by the upward movement of the bottom movable block, thereby pushing the telescopic nozzle and the three telescopic tubes connected to it to rise, so as to change the distance between the telescopic nozzle and the workpiece to be sprayed. When the distance between the telescopic nozzle and the workpiece decreases, the powder can contact the workpiece more quickly, thereby enhancing the powder spraying effect.

[0016] By setting the adjusting component in the present invention, when the movable block rotates, it drives the bar to rotate at the same time. When the voltage is high, the stretched length of the bar is long. When the bar makes a rotational movement, it will directly press against the bottom of the electromagnet of the first extrusion ring. When the voltage decreases, the stretched length of the bar decreases, and the left rotational movement of the bar will bypass the first extrusion ring and thus press against the bottom of the electromagnet of the second extrusion ring or the third extrusion ring. According to the voltage change, the bar presses against the bottom of the electromagnet of the corresponding extrusion ring. When the movable block moves upward, it drives the extrusion ring to move upward in a straight line at the same time. As a thin film made of rubber material, the rubber extrusion film is subjected to an outward expansion force generated when the extrusion ring moves upward, thereby squeezing the volume of the second cavity. When the volume of the second cavity decreases, the amount of powder output from the second cavity per unit time will become less, so that while changing the voltage magnitude, the powder output amount is also changed. Lowering the voltage of the powder spraying device can reduce the velocity of the powder ions, thereby reducing the rebound phenomenon on the surface of the workpiece to be sprayed, and further reducing the shielding effect of the powder spraying. At the same time, the powder output amount during powder spraying is increased. The smaller the voltage, the smaller the extrusion and expansion force of the extrusion ring on the rubber extrusion film, and thus the more powder is output from the second cavity per unit time, achieving multiple benefits at once. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the overall structure of the electrostatic powder spraying device for aluminum profiles provided by the present invention; Figure 2 Schematic diagram of the internal structure of the electrostatic powder spraying device for aluminum profiles provided by the present invention; Figure 3 Schematic diagram of the front sectional structure of the electrostatic powder spraying device for aluminum profiles provided by the present invention; Figure 4 For the present invention Figure 3 Enlarged view at A in; Figure 5 Schematic diagram of the structure of the adjustment assembly of the electrostatic powder spraying device for aluminum profiles provided by the present invention; Figure 6 Enlarged schematic diagram of the structure of the adjustment assembly of the electrostatic powder spraying device for aluminum profiles provided by the present invention.

[0019] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. Outer shell; 2. Connecting flange; 3. First telescopic tube; 4. Second telescopic tube; 5. Third telescopic tube; 6. Telescopic nozzle; 7. Base plate; 8. Atomizing cylinder; 9. Connecting block; 10. Mounting ring; 11. Rubber extrusion film; 12. Cover plate; 13. First extrusion ring; 14. Second extrusion ring; 15. Third extrusion ring; 16. Micro motor; 17. Threaded rod; 18. Movable block; 19. Teeth; 20. Nut; 21. Sleeve; 22. Elastic member; 23. Stripping bar; 24. Electromagnet; 25. Pin shaft; 26. Mounting block; 27. Connecting rod. Detailed implementation manners

[0020] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Refer to Figures 1-6 , the present invention is an electrostatic powder spraying device for aluminum profiles, including a housing 1. An adjustment component and a lifting component are arranged inside the housing 1. The lifting component is located directly above the adjustment component. The housing serves as an external protection component of the electrostatic powder spraying device and plays a role in protecting the internal components. The adjustment assembly includes a bottom plate 7 disposed inside the housing 1. The top edge of the bottom plate 7 is fixedly connected to the bottom surface of the atomization cylinder 8. The top surface of the atomization cylinder 8 is fixedly connected to the inner side surface of the top edge of the housing 1. A first cavity is formed between the atomization cylinder 8 and the housing 1 for transporting the preliminarily atomized powder. A mounting ring 10 is also fixedly installed on the top of the bottom plate 7. A rubber extrusion film 11 is installed on the top of the mounting ring 10. A second cavity is formed between the rubber extrusion film 11 and the atomization cylinder 8. The second cavity is used to adjust the powder output. Three extrusion rings are arranged on the top inner side surface of the mounting ring 10. The three extrusion rings are stacked successively upward, and the extrusion rings are movably connected through wedge-shaped grooves. Four electromagnets 24 are evenly arranged at equal intervals on the inner side surface of each extrusion ring. The bottom plate 7 is used to support the adjustment assembly and the lifting assembly. The atomization cylinder 8 is used to further atomize the preliminarily atomized powder to prevent the powder from not being thoroughly atomized and agglomerating during the spraying process. The mounting ring 10 is used to install and support the rubber extrusion film 11 and the extrusion rings on the top. The mounting ring 10 supports the bottom of the first extrusion ring 13 to play a supporting role. The rubber extrusion film 11, as a rubber film, generates an outward expansion force when being pushed upward by the extrusion ring, thereby squeezing the volume of the second cavity. When the volume of the second cavity decreases, the amount of powder output from the second cavity per unit time will become less. The electromagnet 24 is used to adsorb the bar 23 after being energized. According to the magnitude of the voltage, when the voltage is high, the stretched length of the bar 23 is long. When the bar makes a rotational movement, it will directly press against the bottom of the electromagnet 24 of the first extrusion ring 13. When the voltage decreases, the stretched length of the bar 23 decreases. The left rotational movement of the bar 23 will skip the first extrusion ring 13 and thus press against the bottom of the electromagnet 24 of the second extrusion ring 14 or the third extrusion ring 15. The lifting assembly includes a threaded rod 17. The threaded rod 17 is disposed inside the installation cavity surrounded by the rubber extrusion film 11. Four movable blocks 18 are arranged in an array on the circumferential side surface of the threaded rod 17. A plurality of teeth 19 are arranged on the outer surface of each movable block 18 and are threadedly connected to the threaded rod 17. A nut 20 is also arranged on the movable block 18 and is also movably connected to the threaded rod 17. A bar 23 is arranged at the bottom of the movable block 18. The bar 23 is made of metal. The bar 23 and the electromagnet 24 arranged on the inner side of the extrusion ring are mutually adsorbed in the energized state. The threaded rod 17 rotates under the drive of the micro motor 16, thereby driving the movable block 18 engaged with it through the teeth 19 to rotate around the pin shaft 25 to one side of the threaded rod 17. When the movable block 18 rotates by a certain angle, the nut 20 installed on its surface just rotates to the angle engaged with the threaded rod 17. Therefore, when the threaded rod 17 continues to rotate, it drives the movable block 18 to move upward.

[0024] Among them, four connecting blocks 9 are arranged on the inner side surface of the housing 1. Each connecting block 9 is connected to the bottom outer side surface of the atomization cylinder 8. An installation hole is opened at the bottom of the housing 1, and a connecting flange 2 is welded on the installation hole. The connecting flange 2 is used to connect the pipeline for supplying powder.

[0025] Among them, a round hole is provided at the top of the outer shell 1, and a first telescopic tube 3 is welded to the inner wall of the round hole. A second telescopic tube 4 is slidably sleeved on the inner wall of the first telescopic tube 3. A third telescopic tube 5 is slidably sleeved on the inner wall of the second telescopic tube 4. A telescopic nozzle 6 is slidably sleeved on the inner wall of the third telescopic tube 5. The three telescopic tubes can be raised simultaneously, and the telescopic nozzle 6 is used to spray powder outward for workpiece spraying.

[0026] Among them, the three pressing rings include a first pressing ring 13, a second pressing ring 14 and a third pressing ring 15. The first pressing ring 13, the second pressing ring 14 and the third pressing ring 15 are stacked from bottom to top in sequence, and the inner diameters decrease in sequence. Annular protrusions are provided at the tops of the first pressing ring 13 and the second pressing ring 14, while annular grooves are provided at the bottoms of the second pressing ring 14 and the third pressing ring 15. The annular protrusions at the tops of the first pressing ring 13 and the second pressing ring 14 are respectively arranged inside the annular grooves at the bottoms of the second pressing ring 14 and the third pressing ring 15. The voltages applied to the respective electromagnets 24 provided on the inner walls of the pressing rings change with the change of the control voltage of the electrostatic powder spraying device. That is, when the control voltage of the electrostatic powder spraying device decreases, the energizing voltage of the electromagnet 24 decreases.

[0027] Among them, a micro motor 16 is welded at the center position of the top of the bottom plate 7, and the output end at the top of the micro motor 16 is fixedly connected to the bottom end of the threaded rod 17. The threaded rod 17 is located at the center position of the installation cavity surrounded by the rubber extrusion film 11. A cover plate 12 is installed on the top of the rubber extrusion film 11. Four through holes are provided on the cover plate 12, and a connecting rod 27 is slidably arranged inside each through hole. The tops of the four connecting rods 27 are all installed on the inner top wall of the telescopic nozzle 6.

[0028] Among them, an activity hole is provided inside each activity block 18, and a pin shaft 25 is installed inside each activity hole. The adjacent ends of the four pin shafts 25 are fixedly connected through an installation block 26, and the four pin shafts 25 enclose a rectangle. The top of each installation block 26 is fixedly connected to the bottom end of a connecting rod 27. The connecting rods 27 move upward simultaneously driven by the upward movement of the bottom activity block 18, so as to drive the telescopic nozzle 6 and the three telescopic tubes connected thereto to rise, thereby changing the distance between the telescopic nozzle 6 and the workpiece spraying.

[0029] Among them, a sleeve 21 is welded at the bottom of each activity block 18. An elastic member 22 is arranged inside the sleeve 21. The bottom end of the elastic member 22 is welded to the top of the bar 23. The bar 23 is movably arranged inside the sleeve 21. When the electromagnet 24 is not energized, two-thirds of the length of the bar 23 contracts inside the sleeve 21. At this time, the elastic member 22 is in the normal state without being stressed. When the electromagnet 24 is energized, the elastic member 22 is pulled by the bar 23 and is in the stressed and stretched state.

[0030] Among them, the four dial bars 23 respectively correspond to the electromagnets 24 on the inner walls of the respective extrusion rings. When the dial bars 23 are at the bottom of the electromagnets 24 in the moving state, the electromagnets 24 and the extrusion rings at the installation positions of the electromagnets 24 are lifted upward.

[0031] Among them, the installation cavity enclosed by the rubber extrusion film 11 is in the shape of a frustum of a cone with a smaller upper part and a larger lower part. And the rubber extrusion film 11 is expanded outward during the upward movement of the extrusion ring. At this time, the volume of the second cavity between the rubber extrusion film 11 and the atomizing cylinder 8 decreases.

[0032] The working principle of the present invention is as follows: When an aluminum profile workpiece needs to be sprayed, the preliminarily atomized powder is introduced into the interior of the first chamber. The powder atomized again by the atomizing cylinder enters the interior of the second cavity. Finally, the powder is sprayed on the surface of the aluminum profile workpiece by the telescopic nozzle. When spraying the bent groove position of the aluminum profile, the control voltage of the powder spraying device is reduced, and at the same time, the energizing voltage of the electromagnet decreases. The micro motor is started to drive the threaded rod to rotate, thereby driving the movable block meshed with it through the teeth to rotate around the pin shaft to one side of the threaded rod. When the movable block rotates a certain angle, the nut installed on its surface just rotates to the angle meshed with the threaded rod. Therefore, when the threaded rod continues to rotate, the movable block is driven to move upward; the connecting rod moves upward at the same time driven by the upward movement of the bottom movable block, thereby pushing the telescopic nozzle and the three telescopic tubes connected to it to rise, so as to change the distance between the telescopic nozzle and the workpiece for spraying. When the distance between the telescopic nozzle and the workpiece decreases, the powder can contact the workpiece more quickly, thereby enhancing the powder spraying effect. When the movable block rotates, it drives the dial bar to rotate at the same time. When the voltage is high, the stretched length of the dial bar is long. When the dial bar makes a rotational movement, it will directly push against the bottom of the electromagnet of the first extrusion ring. When the voltage decreases, the stretched length of the dial bar decreases, and the left rotational movement of the dial bar will bypass the first extrusion ring, thereby pushing against the bottom of the electromagnet of the second extrusion ring or the third extrusion ring. According to the voltage change, the dial bar pushes against the bottom of the electromagnet of the corresponding extrusion ring. When the movable block moves upward, it drives the extrusion ring to move upward in a straight line at the same time. The rubber extrusion film, as a rubber film, is subjected to an outward expansion force generated by the upward movement of the extrusion ring, thereby squeezing the volume of the second cavity. When the volume of the second cavity decreases, the amount of powder output from the second cavity per unit time will become less, so that while changing the voltage magnitude, the powder output amount is also changed. Lowering the voltage of the powder spraying device can reduce the speed of the powder ions, thereby reducing the rebound phenomenon on the surface of the workpiece being sprayed, and further reducing the shielding effect of the powder spraying. At the same time, the powder output amount during powder spraying is increased. The smaller the voltage, the smaller the extrusion and expansion force of the extrusion ring on the rubber extrusion film, so that the powder output amount per unit time of the second cavity is more.

[0033] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An electrostatic powder spraying device for aluminum profiles, comprising a housing (1), characterized in that: Inside the housing (1), an adjustment component and a lifting component are provided, and the lifting component is located directly above the adjustment component; The adjustment component includes a bottom plate (7) disposed inside the housing (1). The top edge of the bottom plate (7) is fixedly connected to the bottom surface of the atomization cylinder (8). The top surface of the atomization cylinder (8) is fixedly connected to the inner side surface of the top edge of the housing (1). A first cavity is formed between the atomization cylinder (8) and the housing (1) for transporting the preliminarily atomized powder. A mounting ring (10) is also fixedly installed on the top of the bottom plate (7). A rubber extrusion film (11) is installed on the top of the mounting ring (10). A second cavity is formed between the rubber extrusion film (11) and the atomization cylinder (8). The second cavity is used to adjust the powder output. Three extrusion rings are provided on the top inner side surface of the mounting ring (10). The three extrusion rings are stacked in sequence directly upward, and the extrusion rings are movably connected through wedge-shaped grooves. Four electromagnets (24) are evenly spaced on the inner side surface of each extrusion ring; The lifting component includes a threaded rod (17). The threaded rod (17) is disposed inside the installation cavity surrounded by the rubber extrusion film (11). Four movable blocks (18) are arranged in an array on the circumferential side surface of the threaded rod (17). A plurality of teeth (19) are provided on the outer surface of each movable block (18) and are threadedly connected to the threaded rod (17). A nut (20) is also provided on the movable block (18), and the nut (20) is also movably connected to the threaded rod (17). A bar (23) is provided at the bottom of the movable block (18). The bar (23) is made of metal. The bar (23) and the electromagnet (24) provided on the inner side of the extrusion ring are adsorbed to each other in the energized state.

2. The electrostatic powder spraying device for an aluminum profile according to claim 1, characterized in that, Four connecting blocks (9) are provided on the inner side surface of the housing (1), and each connecting block (9) is connected to the bottom outer side surface of the atomization cylinder (8). An installation hole is opened at the bottom of the housing (1), and a connecting flange (2) is welded on the installation hole.

3. The electrostatic powder spraying device for an aluminum profile according to claim 2, wherein, A round hole is opened at the top of the housing (1). A first telescopic tube (3) is welded on the inner wall of the round hole. A second telescopic tube (4) is slidably sleeved on the inner wall of the first telescopic tube (3). A third telescopic tube (5) is slidably sleeved on the inner wall of the second telescopic tube (4). A telescopic nozzle (6) is slidably sleeved on the inner wall of the third telescopic tube (5).

4. An electrostatic powder spraying device for aluminum profiles according to claim 3, characterized in that, The three extrusion rings include a first extrusion ring (13), a second extrusion ring (14), and a third extrusion ring (15). The first extrusion ring (13), the second extrusion ring (14), and the third extrusion ring (15) are stacked from bottom to top in sequence, and their inner diameters decrease in sequence. Ring-shaped protrusions are provided on the tops of the first extrusion ring (13) and the second extrusion ring (14), and ring-shaped grooves are provided on the bottoms of the second extrusion ring (14) and the third extrusion ring (15). The ring-shaped protrusions on the tops of the first extrusion ring (13) and the second extrusion ring (14) are respectively arranged inside the ring-shaped grooves on the bottoms of the second extrusion ring (14) and the third extrusion ring (15). The voltage applied to each electromagnet (24) arranged on the inner wall of the extrusion ring changes with the control voltage of the electrostatic powder spraying device. That is, when the control voltage of the electrostatic powder spraying device decreases, the energizing voltage of the electromagnet (24) decreases.

5. The electrostatic powder spraying device for an aluminum profile according to claim 4, characterized in that, A micro motor (16) is welded at the center position of the top of the bottom plate (7). The output end at the top of the micro motor (16) is fixedly connected to the bottom end of a threaded rod (17). The threaded rod (17) is located at the center position of the installation cavity surrounded by the rubber extrusion film (11). A cover plate (12) is installed on the top of the rubber extrusion film (11). Four through holes are provided on the cover plate (12). A connecting rod (27) is slidably arranged inside each through hole. The tops of the four connecting rods (27) are all installed on the inner top wall of the telescopic nozzle (6).

6. The electrostatic powder spraying device for an aluminum profile according to claim 5, characterized in that, An activity hole is provided inside each movable block (18), and a pin shaft (25) is installed inside each activity hole. The adjacent ends of the four pin shafts (25) are fixedly connected by an installation block (26). The four pin shafts (25) enclose a rectangle. The top of each installation block (26) is fixedly connected to the bottom end of a connecting rod (27).

7. An electrostatic powder spraying device for aluminum profiles according to claim 6, characterized in that, A sleeve (21) is welded at the bottom of each movable block (18). An elastic member (22) is arranged inside the sleeve (21). The bottom end of the elastic member (22) is welded to the top of a strip (23). The strip (23) is movably arranged inside the sleeve (21). Two-thirds of the length of the strip (23) shrinks inside the sleeve (21) when the electromagnet (24) is in the non-energized state. At this time, the elastic member (22) is in the normal state without being stressed. When the electromagnet (24) is energized, the elastic member (22) is pulled by the strip (23) and is in the stressed and stretched state.

8. An electrostatic powder spraying device for aluminum profiles according to claim 7, characterized in that, The four strips (23) respectively correspond to the electromagnets (24) on the inner walls of the extrusion rings. When the strip (23) is in the moving state and is at the bottom of the electromagnet (24), it lifts the electromagnet (24) and the extrusion ring at the installation position of the electromagnet (24) upward.

9. An electrostatic powder spraying device for aluminum profiles according to claim 8, characterized in that, The installation cavity surrounded by the rubber extrusion film (11) is in the shape of a frustum with a smaller upper part and a larger lower part. And the rubber extrusion film (11) is expanded outward during the upward movement of the extrusion ring. At this time, the volume of the second cavity between the rubber extrusion film (11) and the atomizing cylinder (8) decreases.

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