An electrostatic powder spraying device for aluminum profiles

Abstract

The present invention discloses an electrostatic powder spraying device for aluminum profiles, and relates to the technical field of electrostatic powder spraying. The present invention includes a shell, an adjustment component and a lifting component are provided inside the shell, and the lifting component is located directly above the adjustment component; the adjustment component includes a bottom plate provided inside the shell, the top edge position of the bottom plate is fixedly connected to the bottom surface of the atomizing tube, the top surface of the atomizing tube is fixedly connected to the inner side surface of the top edge position of the shell, and a first cavity is formed between the atomizing tube and the shell for conveying preliminarily atomized powder; a mounting ring is also fixedly installed on the top of the bottom plate, and a circle of rubber extrusion membrane is installed on the top of the mounting ring, and a second cavity is formed between the rubber extrusion membrane and the atomizing tube. The present invention changes the powder output by changing the voltage while lowering the voltage of the powder spraying device to reduce the powder ion velocity, thereby reducing the rebound phenomenon sprayed on the workpiece surface, and further reducing the shielding effect of the powder spraying.

Description

Technical Field

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

[0002] Electrostatic powder spraying is commonly used when coating aluminum profiles. Electrostatic spraying utilizes the principle of a high-voltage electrostatic corona field. The metal guide cup on the spray gun head is connected to a high-voltage negative charge, while the workpiece being coated is grounded to form a positive electrode. This creates a strong electrostatic field between the spray gun and the workpiece. As the carrier gas (compressed air) transports the powder coating from the powder supply drum through the powder delivery tube to the guide cup of the spray gun, a dense charge forms around it, imparting a negative charge to the powder. The electrostatic force and compressed air uniformly adsorb the powder onto the workpiece. Upon heating, the powder melts and solidifies (or plasticizes), forming a uniform, continuous, smooth, and even coating. Electrostatic powder spraying offers advantages such as high spraying efficiency, high coating utilization, and excellent coating quality.

[0003] At present, when electrostatic powder spraying is performed on the surface of aluminum profiles, since some aluminum profile surfaces have curved surfaces, the bending groove positions are easily affected by the Faraday shielding effect, resulting in poor spraying effects, thereby affecting the spraying effect. Traditional electrostatic powder spraying is performed using a manual handheld spray gun, and the distance of the sprayed workpiece cannot be properly adjusted 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 the problem of difficulty in applying powder when spraying at the bending groove position of the aluminum profile due to the Faraday shielding effect. At the same time, the distance and powder spraying amount when spraying the workpiece cannot be appropriately adjusted according to the different spraying positions of the workpiece. 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 problem that the existing aluminum profile powder spraying device is difficult to apply powder when spraying at the bending groove position of the aluminum profile due to the Faraday shielding effect, and the distance when spraying the workpiece cannot be appropriately adjusted according to the different spraying positions of the workpiece.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is an electrostatic powder spraying device for aluminum profiles, comprising a housing, an adjustment assembly and a lifting assembly disposed within the housing, the lifting assembly being located directly above the adjustment assembly. The housing serves as an external protective component of the electrostatic powder spraying device, protecting the internal components.

[0008] The adjusting component includes a bottom plate arranged inside the shell, the top edge position of the bottom plate is fixedly connected to the bottom surface of the atomizing tube, the top surface of the atomizing tube is fixedly connected to the inner side surface of the top edge position of the shell, and a first cavity is formed between the atomizing tube and the shell for conveying the preliminarily atomized powder; a mounting ring is also fixedly installed on the top of the bottom plate, a circle of rubber extrusion membrane is installed on the top of the mounting ring, and a second cavity is formed between the rubber extrusion membrane and the atomizing tube, and the second cavity is used to adjust the powder output, and three extrusion rings are provided on the top of the inner side surface of the mounting ring, and the three extrusion rings are stacked in sequence upwards, and the extrusion rings are movably connected by wedge-shaped grooves; four electromagnets are evenly spaced on the inner side surface of each extrusion ring, the bottom plate is used to support the adjusting component and the lifting component, and the atomizing tube is used to convey the preliminarily atomized powder Further atomization is carried out to avoid incomplete atomization of powder and thus agglomeration during the spraying process. The mounting ring is used to install the rubber extrusion membrane and the extrusion ring on the top of the support. The mounting ring is supported on the bottom of the first extrusion ring to play a supporting role. The rubber extrusion membrane, as a thin film made of rubber material, generates an outward expansion force 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; the electromagnet is used to adsorb the pick after power is turned on. According to the size of the voltage, when the voltage is large, the length of the pick is long, and when the pick rotates, it will directly hit the bottom of the electromagnet of the first extrusion ring. When the voltage decreases, the length of the pick is reduced, and the rotation of the pick will skip the first extrusion ring, thereby hitting the bottom of the electromagnet of the second extrusion ring or the third extrusion ring;

[0009] The lifting assembly includes a threaded rod, which is arranged inside an installation cavity surrounded by a rubber extrusion membrane. Four movable blocks are arranged in an array on the side surface of the threaded rod. The outer surface of each movable block is provided with a plurality of teeth that are threadedly connected to the threaded rod, and a nut is also provided on the movable block, and the nut is also movably connected to the threaded rod; a shift bar is provided at the bottom of the movable block, and the shift bar is made of metal. The shift bar and the electromagnet arranged on the inner side of the extrusion ring are attracted to each other when powered, and the threaded rod rotates under the drive of the micro motor, thereby driving the movable block engaged with it through the teeth to rotate toward one side of the threaded rod with the pin shaft as the center of the circle. When the movable block rotates a certain angle, the nut installed on its surface just rotates to the angle of engagement with the threaded rod. Therefore, when the threaded rod continues to rotate, it drives the movable block to move upward.

[0010] Preferably, four connecting blocks are provided on the inner side of the shell, each connecting block is connected to the bottom of the outer side of the atomizer tube; a mounting hole is provided at the bottom of the shell, a connecting flange is welded on the mounting hole, and the connecting flange is used to connect a pipeline for providing powder.

[0011] Preferably, a circular hole is opened on the top of the shell, a first telescopic tube is welded to the inner wall of the circular 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 nozzle is slidably sleeved on the inner wall of the third telescopic tube; the three telescopic tubes can be raised upward at the same time, and the telescopic nozzle is used to spray powder outward to spray the workpiece.

[0012] Preferably, the three extrusion rings include a first extrusion ring, a second extrusion ring and a third extrusion ring, and the first extrusion ring, the second extrusion ring and the third extrusion ring are stacked in sequence from bottom to top, and the inner diameters decrease in sequence; the first extrusion ring and the second extrusion ring are both provided with an annular protrusion on the top, and the second extrusion ring and the third extrusion ring are both provided with an annular groove on the bottom, and the annular protrusions on the top of the first extrusion ring and the second extrusion ring are respectively arranged inside the annular grooves on the bottom of the second extrusion ring and the third extrusion ring; the voltage passed through each electromagnet 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 power-on voltage of the electromagnet decreases.

[0013] Preferably, a micro motor is welded at the center position of the top of the base plate, and the top output end of the micro motor is fixedly connected to the bottom end of the threaded rod; the threaded rod is located at the center position of the installation cavity surrounded by the rubber extrusion membrane, and a cover plate is installed on the top of the rubber extrusion membrane, and four through holes are opened on the cover plate, and a connecting rod is slidably arranged inside each through hole, and the top ends of the four connecting rods are installed on the inner top wall of the telescopic nozzle.

[0014] Preferably, each movable block is provided with a movable hole, and a pin is installed in each movable hole. The four adjacent pins are fixedly connected at their ends by a mounting block, and the four pins form a rectangle; the top of each mounting block is fixedly connected to the bottom end of a connecting rod, and the connecting rod moves upward at the same time as the upward movement of the bottom movable block, thereby pushing the telescopic nozzle and the three telescopic tubes connected thereto upward, thereby changing the distance between the telescopic nozzle and the workpiece for spraying.

[0015] Preferably, a sleeve is welded to the bottom of each movable block, an elastic part is arranged inside the sleeve, the bottom end of the elastic part is welded to the top of the shift bar, and the shift bar is movably arranged inside the sleeve; when the electromagnet is not energized, two-thirds of the length of the shift bar is retracted inside the sleeve, and the elastic part is in a normal state without stress. When the electromagnet is energized, the elastic part is pulled by the shift bar and is in a stressed and stretched state.

[0016] Preferably, the four shift bars correspond to the electromagnets on the inner walls of the extrusion rings respectively. When the shift bars are in motion, they are located at the bottom of the electromagnets and lift the electromagnets and the extrusion rings at the electromagnet installation positions upwards.

[0017] Preferably, the mounting cavity surrounded by the rubber extrusion membrane is in the shape of a truncated cone with a small top and a large bottom, and the rubber extrusion membrane is expanded outwards during the upward movement of the extrusion ring, at which time the volume of the second cavity between the rubber extrusion membrane and the atomizing tube is reduced.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a lifting assembly. When the aluminum profile workpiece needs to be sprayed, the preliminarily atomized powder is passed into the first chamber, the powder atomized again by the atomizing cylinder enters the second cavity, and finally the powder is sprayed on the surface of the aluminum profile workpiece by the telescopic nozzle. When the bending groove position of the aluminum profile is sprayed, the control voltage of the powder spraying device is reduced, and the energizing voltage of the electromagnet is reduced. 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 toward one side of the threaded rod with the pin as the center of the circle. When the movable block rotates a certain angle, the nut mounted on its surface just rotates to the angle engaged 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 under the drive of the upward movement of the bottom movable block, thereby pushing the telescopic nozzle and the three telescopic tubes connected thereto upward, thereby changing the distance between the telescopic nozzle and the workpiece for spraying. When the distance between the telescopic nozzle and the workpiece is reduced, the powder can contact the workpiece more quickly, thereby increasing the effect of powder spraying.

[0020] The present invention sets an adjustment component. When the movable block rotates, the dial bar is driven to rotate at the same time. When the voltage is large, the length of the stretched dial bar is long. When the dial bar rotates, it will directly hit the bottom of the electromagnet of the first extrusion ring. When the voltage decreases, the length of the stretched dial bar decreases. The left rotation of the dial bar will skip the first extrusion ring, thereby hitting the bottom of the electromagnet of the second extrusion ring or the third extrusion ring. According to the voltage change, the dial bar hits the bottom of the electromagnet of the corresponding extrusion ring. When the movable block moves upward, it also drives the extrusion ring to move linearly upward. The rubber extrusion membrane is a thin film made of rubber material and is affected by the upward movement of the extrusion ring. During movement, an outward expansion force is generated, 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, thereby changing the powder output while changing the voltage. Lowering the voltage of the powder spraying device can reduce the speed of powder ions, thereby reducing the rebound phenomenon sprayed on the workpiece surface, and further reducing the shielding effect of powder spraying, while increasing the powder output during powder spraying. The smaller the voltage, the smaller the extrusion ring's extrusion and expansion force on the rubber extrusion membrane, thereby more powder output per unit time from the second cavity, achieving multiple goals at one stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the overall structure of the electrostatic powder spraying device for aluminum profiles provided by the present invention;

[0023] Figure 2 A schematic diagram of the internal structure of the electrostatic powder spraying device for aluminum profiles provided by the present invention;

[0024] Figure 3 A schematic front cross-sectional view of the electrostatic powder spraying device for aluminum profiles provided by the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 A schematic diagram of the structure of the adjustment assembly of the electrostatic powder spraying device for aluminum profiles provided by the present invention;

[0027] Figure 6 This is a schematic diagram of the enlarged structure of the adjustment component of the electrostatic powder spraying device for aluminum profiles provided by the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Housing; 2. Connecting flange; 3. First telescopic tube; 4. Second telescopic tube; 5. Third telescopic tube; 6. Telescopic nozzle; 7. Base plate; 8. Atomizing tube; 9. Connecting block; 10. Mounting ring; 11. Rubber extrusion membrane; 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. Switch bar; 24. Electromagnet; 25. Pin; 26. Mounting block; 27. Connecting rod. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] See Figure 1-6 The present invention is an electrostatic powder spraying device for aluminum profiles, comprising a housing 1, an adjusting assembly and a lifting assembly disposed inside the housing 1, the lifting assembly being located directly above the adjusting assembly, the housing serving as an external protective component of the electrostatic powder spraying device, and protecting the internal components;

[0034] The regulating component includes a bottom plate 7 arranged inside the shell 1, the top edge position of the bottom plate 7 is fixedly connected to the bottom surface of the atomizing tube 8, the top surface of the atomizing tube 8 is fixedly connected to the inner side surface of the top edge position of the shell 1, and a first cavity is formed between the atomizing tube 8 and the shell 1 for conveying the preliminarily atomized powder; a mounting ring 10 is also fixedly installed on the top of the bottom plate 7, and a circle of rubber extrusion membrane 11 is installed on the top of the mounting ring 10, and a second cavity is formed between the rubber extrusion membrane 11 and the atomizing tube 8, and the second cavity is used to adjust the powder output, and three extrusion rings are arranged on the top of the inner side of the mounting ring 10, and the three extrusion rings are stacked in sequence upwards, and the extrusion rings are movably connected by wedge-shaped grooves; four electromagnets 24 are evenly spaced on the inner side of each extrusion ring, the bottom plate 7 is used to support the regulating component and the lifting component, and the atomizing tube 8 is used to further atomize the preliminarily atomized powder to avoid The powder is not completely atomized and thus agglomerates. The mounting ring 10 is used to install the rubber extrusion membrane 11 and the extrusion ring at the top of the support. The mounting ring 10 is supported on the bottom of the first extrusion ring 13 to play a supporting role. The rubber extrusion membrane 11, as a thin film made of rubber material, generates an outward expansion force 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; the electromagnet 24 is used to adsorb the pick 23 after being energized. According to the size of the voltage, when the voltage is large, the length of the pick 23 is stretched long, and when the pick rotates, it will directly hit the bottom of the electromagnet 24 of the first extrusion ring 13. When the voltage decreases, the length of the pick 23 is stretched less, and the left rotation of the pick 23 will skip the first extrusion ring 13, thereby hitting the bottom of the electromagnet 24 of the second extrusion ring 14 or the third extrusion ring 15;

[0035] The lifting assembly includes a threaded rod 17, which is arranged inside the installation cavity surrounded by the rubber extrusion membrane 11. Four movable blocks 18 are arranged in an array on the side surface of the threaded rod 17. The outer surface of each movable block 18 is provided with a plurality of teeth 19 that are threadedly connected to the threaded rod 17, and a nut 20 is also provided on the movable block 18, which is also movably connected to the threaded rod 17; a shift bar 23 is provided at the bottom of the movable block 18, and the shift bar 23 is made of metal. The shift bar 23 and the electromagnet 24 arranged on the inner side of the extrusion ring are attracted to each other when powered. 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 toward one side of the threaded rod 17 with the pin shaft 25 as the center of the circle. When the movable block 18 rotates a certain angle, the nut 20 mounted on its surface just rotates to the angle of engagement with the threaded rod 17. Therefore, when the threaded rod 17 continues to rotate, the movable block 18 is driven to move upward.

[0036] Among them, four connecting blocks 9 are provided on the inner side of the shell 1, and each connecting block 9 is connected to the bottom of the outer side of the atomizing tube 8; a mounting hole is opened at the bottom of the shell 1, and a connecting flange 2 is welded on the mounting hole, and the connecting flange 2 is used to connect the pipeline for providing powder.

[0037] Among them, a circular hole is opened on the top of the shell 1, and a first telescopic tube 3 is welded to the inner wall of the circular hole. A second telescopic tube 4 is slidably connected to the inner wall of the first telescopic tube 3, a third telescopic tube 5 is slidably connected to the inner wall of the second telescopic tube 4, and a telescopic nozzle 6 is slidably connected to the inner wall of the third telescopic tube 5; the three telescopic tubes can be raised upward at the same time, and the telescopic nozzle 6 is used to spray powder outward to spray the workpiece.

[0038] Among them, 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 in sequence from bottom to top, and the inner diameters decrease in sequence; the first extrusion ring 13 and the second extrusion ring 14 are both provided with an annular protrusion on the top, and the second extrusion ring 14 and the third extrusion ring 15 are both provided with an annular groove at the bottom, and the annular protrusions on the top of the first extrusion ring 13 and the second extrusion ring 14 are respectively arranged inside the annular grooves at the bottom of the second extrusion ring 14 and the third extrusion ring 15; the voltage passed through 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 power-on voltage of the electromagnet 24 decreases.

[0039] Among them, a micro motor 16 is welded at the center position of the top of the base plate 7, and the top output end 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 membrane 11, and a cover plate 12 is installed on the top of the rubber extrusion membrane 11. Four through holes are opened on the cover plate 12, and a connecting rod 27 is slidably arranged inside each through hole. The top ends of the four connecting rods 27 are all installed on the inner top wall of the telescopic nozzle 6.

[0040] Among them, each movable block 18 is provided with a movable hole, and each movable hole is installed with a pin shaft 25. The four adjacent pin shafts 25 are fixedly connected at their ends by a mounting block 26, and the four pin shafts 25 form a rectangle; the top of each mounting block 26 is fixedly connected to the bottom end of a connecting rod 27, and the connecting rod 27 moves upward at the same time under the drive of the upward movement of the bottom movable block 18, thereby driving the telescopic nozzle 6 and the three telescopic tubes connected thereto to rise upward, thereby changing the distance between the telescopic nozzle 6 and the workpiece spraying.

[0041] Among them, a sleeve 21 is welded to the bottom of each movable block 18, and an elastic part 22 is arranged inside the sleeve 21. The bottom end of the elastic part 22 is welded to the top of the shift bar 23, and the shift bar 23 is movably arranged inside the sleeve 21; when the electromagnet 24 is not energized, two-thirds of the length of the shift bar 23 is retracted inside the sleeve 21. At this time, the elastic part 22 is in a normal state without force. When the electromagnet 24 is energized, the elastic part 22 is pulled by the shift bar 23 and is in a stressed and stretched state.

[0042] Among them, the four shift bars 23 correspond to the electromagnets 24 on the inner walls of the extrusion rings respectively. When the shift bars 23 are in motion, they are located at the bottom of the electromagnets 24 and lift the electromagnets 24 and the extrusion rings where the electromagnets 24 are installed upwards.

[0043] The mounting cavity surrounded by the rubber extrusion membrane 11 is in the shape of a truncated cone with a small top and a large bottom. The rubber extrusion membrane 11 is expanded outwards during the upward movement of the extrusion ring. At this time, the volume of the second cavity between the rubber extrusion membrane 11 and the atomizing tube 8 is reduced.

[0044] The working principle of the present invention is as follows: when the aluminum profile workpiece needs to be sprayed, the preliminarily atomized powder is passed into the first chamber, the powder atomized again by the atomizing tube enters the second cavity, and finally the powder is sprayed on the surface of the aluminum profile workpiece by the telescopic nozzle. When the bending groove position of the aluminum profile is sprayed, the control voltage of the powder spraying device is reduced, and the energized voltage of the electromagnet is reduced. 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 toward one side of the threaded rod with the pin as the center of the circle. When the movable block rotates a certain angle, the nut mounted on its surface just rotates to the angle engaged 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 under the drive of the upward movement of the bottom movable block, thereby pushing the telescopic nozzle and the three telescopic tubes connected thereto upward, thereby changing the distance between the telescopic nozzle and the workpiece spraying. When the distance between the telescopic nozzle and the workpiece is reduced, the powder can contact the workpiece more quickly, thereby increasing the effect of powder spraying. When the movable block rotates, the lever is driven to rotate at the same time. When the voltage is large, the length of the lever is stretched is long. When the lever rotates, it will directly hit the bottom of the electromagnet of the first extrusion ring. When the voltage is reduced, the length of the lever is stretched is reduced, and the left rotation of the lever will skip the first extrusion ring, thereby hitting the bottom of the electromagnet of the second extrusion ring or the third extrusion ring. According to the voltage change, the lever hits the bottom of the electromagnet of the corresponding extrusion ring. When the movable block moves upward, it also drives the extrusion ring to move upward in a straight line. The rubber extrusion membrane, as a thin film of rubber material, generates an outward expansion force 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 decrease, thereby changing the powder output while changing the voltage. Lowering the voltage of the powder spraying device can reduce the powder ion velocity, thereby reducing the rebound phenomenon sprayed on the workpiece surface, thereby reducing the shielding effect of powder spraying, and at the same time increasing the powder output during powder spraying. The smaller the voltage, the smaller the extrusion ring's extrusion and expansion force on the rubber extrusion membrane, thereby more powder output per unit time from the second cavity.

[0045] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention 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: An adjusting component and a lifting component are provided inside the housing (1), and the lifting component is located directly above the adjusting component; The regulating assembly comprises a bottom plate (7) arranged inside the housing (1), the top edge of the bottom plate (7) is fixedly connected to the bottom surface of the atomizing tube (8), the top surface of the atomizing tube (8) is fixedly connected to the inner side surface of the top edge of the housing (1), and a first cavity is formed between the atomizing tube (8) and the housing (1) for conveying preliminarily atomized powder; a mounting ring (10) is also fixedly mounted on the top of the bottom plate (7), a circle of rubber extrusion membrane (11) is mounted on the top of the mounting ring (10), and a second cavity is formed between the rubber extrusion membrane (11) and the atomizing tube (8), and the second cavity is used to adjust the powder output; three extrusion rings are arranged on the top of the inner side surface of the mounting ring (10), and the three extrusion rings are stacked in sequence upwards, 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 assembly includes a threaded rod (17), which is arranged inside a mounting cavity surrounded by a rubber extrusion membrane (11). Four movable blocks (18) are arranged in an array around the side surface of the threaded rod (17). The outer surface of each movable block (18) is provided with a plurality of teeth (19) threadedly connected to the threaded rod (17), and a nut (20) is also provided on the movable block (18). The nut (20) is also movably connected to the threaded rod (17); a shift bar (23) is provided at the bottom of the movable block (18), and the shift bar (23) is made of metal. The shift bar (23) and the electromagnet (24) provided on the inner side of the extrusion ring are attracted to each other when powered.

2. The electrostatic powder spraying device for aluminum profiles according to claim 1, characterized in that: Four connecting blocks (9) are provided on the inner side of the housing (1), and each connecting block (9) is connected to the bottom of the outer side of the atomizing tube (8); a mounting hole is provided at the bottom of the housing (1), and a connecting flange (2) is welded to the mounting hole.

3. The electrostatic powder spraying device for aluminum profiles according to claim 2, characterized in that: A circular hole is formed on the top of the shell (1), a first telescopic tube (3) is welded to the inner wall of the circular 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), and a telescopic nozzle (6) is slidably sleeved on the inner wall of the third telescopic tube (5).

4. The 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), wherein the first extrusion ring (13), the second extrusion ring (14) and the third extrusion ring (15) are stacked in sequence from bottom to top, and their inner diameters decrease in sequence; the tops of the first extrusion ring (13) and the second extrusion ring (14) are both provided with an annular protrusion, and the bottoms of the second extrusion ring (14) and the third extrusion ring (15) are both provided with an annular groove, and the annular protrusions on the tops of the first extrusion ring (13) and the second extrusion ring (14) are respectively arranged inside the annular 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 voltage applied to the electromagnet (24) decreases.

5. The electrostatic powder spraying device for aluminum profiles according to claim 4, characterized in that: A micro motor (16) is welded at the center of the top of the base plate (7), and the top output end 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 of the installation cavity surrounded by the rubber extrusion membrane (11), and a cover plate (12) is installed on the top of the rubber extrusion membrane (11), and four through holes are opened on the cover plate (12), and a connecting rod (27) is slidably arranged inside each through hole, and the top ends of the four connecting rods (27) are installed on the inner top wall of the telescopic nozzle (6).

6. The electrostatic powder spraying device for aluminum profiles according to claim 5, characterized in that: Each movable block (18) is provided with a movable hole, and a pin shaft (25) is installed in each movable hole. The four adjacent pin shafts (25) are fixedly connected at their ends by a mounting block (26), and the four pin shafts (25) form a rectangle; the top of each mounting block (26) is fixedly connected to the bottom end of a connecting rod (27).

7. The electrostatic powder spraying device for aluminum profiles according to claim 6, characterized in that: A sleeve (21) is welded to 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 the shift bar (23), and the shift bar (23) is movably arranged inside the sleeve (21); when the electromagnet (24) is not energized, two-thirds of the length of the shift bar (23) is retracted inside the sleeve (21), and the elastic member (22) is in a normal state without stress; when the electromagnet (24) is energized, the elastic member (22) is pulled by the shift bar (23) and is in a stressed and stretched state.

8. The electrostatic powder spraying device for aluminum profiles according to claim 7, characterized in that: The four shift bars (23) correspond to the electromagnets (24) on the inner walls of the extrusion rings respectively. When the shift bars (23) are in motion, they are located at the bottom of the electromagnets (24) and lift the electromagnets (24) and the extrusion rings at the installation positions of the electromagnets (24) upwards.

9. The electrostatic powder spraying device for aluminum profiles according to claim 8, characterized in that: The installation cavity enclosed by the rubber extrusion membrane (11) is in the shape of a truncated cone with a smaller top and a larger bottom, and the rubber extrusion membrane (11) is expanded outwards during the upward movement of the extrusion ring, at which time the volume of the second cavity between the rubber extrusion membrane (11) and the atomizing tube (8) is reduced.

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