A powder coating equipment for aluminum profiles

Abstract

This application relates to a powder coating equipment for aluminum profiles, including a spraying robotic arm, an adjustment frame mounted on the spraying robotic arm, two position adjustment modules symmetrically mounted on the adjustment frame, two swing modules respectively mounted on the two position adjustment modules, two adjustment plates respectively mounted on the two swing modules, a negative pressure chamber within the adjustment plates, and negative pressure holes evenly distributed on the working surface of the adjustment plates and communicating with the negative pressure chamber. The distance between the two swing modules is adjustable, and the two swing modules are used to drive the two adjustment plates to adjust between a spraying position and a non-spraying position. The powder coating equipment for aluminum profiles disclosed in this application achieves automated spraying of irregularly shaped structures by dynamically adjusting the spraying range and controlling the amount of powder sprayed.

Description

Technical Field

[0001] This application relates to the field of powder coating technology, and in particular to a powder coating device for aluminum profiles. Background Technology

[0002] Powder coating of aluminum profiles is a complete process system consisting of pretreatment, spraying, curing, and posttreatment. Its core objective is to form a uniform, dense, and high-performance powder coating on the surface of aluminum profiles, which combines decorative and corrosion-resistant properties.

[0003] Current spraying technology has evolved to the stage of automated spraying. This is mainly achieved by using a conveying system (using a suspended conveyor chain or gantry crane that runs through the entire process of pretreatment, spraying, and curing) to ensure production continuity and by using robotic arms for automated spraying. At the same time, a powder recovery system is used to achieve the secondary utilization of raw materials and to purify equipment to meet environmental protection requirements.

[0004] However, for aluminum profiles, it is still necessary to add inspection and manual touch-up spraying processes, mainly because the irregular structure of aluminum profiles (grooves, slots, holes) causes local thickness abnormalities. Current solutions include customized spray guns, step-by-step layering schemes, and adjusting spray trajectory and parameters.

[0005] These solutions can solve the problem to some extent, but for the increasing number of small-batch productions, the implementation cost of these methods is too high. For example, the applicability of customized spray guns is limited, the step-by-step layering solution requires additional manual spraying steps, and adjusting the spraying trajectory and parameters requires experienced personnel to make decisions based on multiple tests. Summary of the Invention

[0006] This application provides a powder coating equipment for aluminum profiles, which achieves automated coating of irregular structures by dynamically adjusting the coating range and controlling the amount of powder sprayed.

[0007] The above-mentioned objective of this application is achieved through the following technical solution:

[0008] This application provides a powder coating device for aluminum profiles, comprising:

[0009] A robotic arm for spray painting;

[0010] The adjustment frame is mounted on the spraying robot arm;

[0011] Two position adjustment modules are symmetrically arranged on the adjustment frame;

[0012] Two swing modules are respectively located on two position adjustment modules, and the distance between the two swing modules can be adjusted;

[0013] Two first adjustment plates are respectively mounted on two swing modules, and the two swing modules are used to drive the two first adjustment plates to adjust between the spraying position and the non-spraying position;

[0014] The negative pressure chamber is located inside the first regulating plate;

[0015] Negative pressure holes are evenly distributed on the working surface of the first adjusting plate and are connected to the negative pressure chamber.

[0016] In one possible implementation of this application, a flexible adjustment element is provided on the inner wall of the negative pressure chamber, which is used to adjust the flow area of ​​the negative pressure hole.

[0017] In one possible implementation of this application, the flexible adjustment element includes:

[0018] Multiple guide beams are spaced apart on the working surface of the first adjusting plate or on the inner wall of the negative pressure chamber;

[0019] The flexible plate passes sequentially through the gap between each guide beam and the first adjusting plate. Flexible adjusting holes that match the negative pressure holes are evenly distributed on the flexible plate.

[0020] The driver is located on the first adjustment plate and connected to the flexible plate.

[0021] In one possible implementation of this application, the flexible plate is further provided with an airflow guide shell, and the number of airflow guide shells is the same as that of the flexible adjustment holes and they correspond one-to-one.

[0022] The airflow guide shell and the corresponding flexible adjustment hole form an adjustment channel, and the orientation of the adjustment channel is not perpendicular to the plane where the flexible adjustment hole is located.

[0023] In one possible implementation of this application, the first adjusting plate includes two horizontal segments and an arc-shaped segment located between the two horizontal segments;

[0024] When the two first adjustment plates are in the spraying position, the distance between the horizontal sections of the two first adjustment plates is not equal.

[0025] In one possible implementation of this application, the negative pressure hole is located on the arc-shaped section of the first adjustment plate and the horizontal section near the position adjustment module.

[0026] In one possible implementation of this application, an antistatic coating is applied to the working surface of the horizontal segment away from the position adjustment module.

[0027] In one possible implementation of this application, a guide adjustment member is provided on the working surface of the horizontal section away from the position adjustment module. The guide adjustment member is used to adjust the tilt angle of the horizontal section away from the position adjustment module.

[0028] In one possible implementation of this application, the guide adjustment element includes:

[0029] The flexible sheet has its edges bonded to a horizontal section that is far from the position adjustment module.

[0030] The second adjustment plate is bonded to the inner side of the flexible sheet and hinged to the horizontal section away from the position adjustment module.

[0031] The adjustment plate driver is connected at both ends to the flexible sheet and the horizontal section away from the position adjustment module, respectively.

[0032] The beneficial effects of this application are as follows:

[0033] The powder coating equipment for aluminum profiles disclosed in this application can be used with an electrostatic powder spray gun for spraying operations. When performing large-area spraying operations, the powder coating equipment for aluminum profiles disclosed in this application is in a non-spraying state. When performing groove spraying operations, the powder coating equipment for aluminum profiles disclosed in this application is in a spraying state.

[0034] The powder coating equipment for aluminum profiles disclosed in this application can also adapt to grooves of different widths by dynamically adjusting the spraying range, and achieve automated spraying of irregular structures by controlling the amount of powder sprayed. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating the spraying process principle of an electrostatic powder spray gun provided in this application.

[0036] Figure 2 This is a schematic diagram illustrating the spraying process principle of another electrostatic powder spray gun provided in this application.

[0037] Figure 3 This is a schematic diagram illustrating the principle of a groove that is not easily sprayed, as provided in this application.

[0038] Figure 4 This is a schematic diagram of the use of the powder coating equipment for aluminum profiles disclosed in this application.

[0039] Figure 5 This is a structural schematic diagram of an adjustment frame, a position adjustment module, and a swing module provided in this application.

[0040] Figure 6 This is a schematic diagram illustrating the working principle of a swing module provided in this application.

[0041] Figure 7 This is a schematic diagram of the internal structure and accessories of an adjustment plate provided in this application.

[0042] Figure 8 This is a partial structural schematic diagram of a flexible adjustment component provided in this application.

[0043] Figure 9 This is a schematic diagram illustrating the effect of airflow on powder particle flow provided in this application.

[0044] Figure 10 This is a schematic diagram illustrating another effect of airflow on powder particle flow provided in this application.

[0045] Figure 11 This is a structural schematic diagram of a guide adjustment component provided in this application.

[0046] Figure 12 and Figure 13 This is a schematic diagram of the powder coating method of the aluminum profile powder coating equipment disclosed in this application.

[0047] In the diagram, 1 is the spraying robot arm, 2 is the adjustment frame, 4 is the flexible adjustment component, 5 is the guide adjustment component, 21 is the position adjustment module, 31 is the swing module, 32 is the first adjustment plate, 33 is the negative pressure chamber, 34 is the negative pressure hole, 41 is the guide beam, 42 is the flexible plate, 43 is the driver, 44 is the airflow guide shell, 51 is the flexible sheet, 52 is the second adjustment plate, 53 is the adjustment plate driver, 321 is the horizontal section, and 322 is the arc section. Detailed Implementation

[0048] To better understand the technical solutions in this application, the relevant content will be introduced first.

[0049] First, let's introduce the industry's solutions:

[0050] Customized spray gun combinations: To address the issue of weak electric fields inside deep tanks, a short-nozzle close-range spray gun and a flexible spray bar spray gun can be used. The short-nozzle spray gun shortens the powder spraying distance, reduces charge loss during powder transport, and makes it easier for the powder to reach the bottom of the tank; the flexible spray bar can reach deep into the tank, targeting hidden areas within the tank. By adjusting the spray gun voltage, the shielding effect of the strong surface electric field on the tank can be reduced, balancing the coating thickness between the tank and the profile surface.

[0051] Step-by-step layer-by-layer spraying scheme: For deep grooves with a depth-to-bottom-width ratio ≥2, a combination process of "hand-sprayed primer + hand-sprayed base coat mixture + hand-sprayed top coat + automatic sprayed clear coat" can be adopted.

[0052] First, the amount of primer used in the deep groove is precisely controlled by hand spraying to avoid missed areas; the intermediate layer of primer and topcoat mixture can enhance the adhesion of the coating; finally, the clear coat is automatically sprayed to ensure the overall appearance is consistent.

[0053] Adjust the spraying trajectory and parameters: Set the spray gun's trajectory to be parallel to the direction of the profile suspension to reduce the amount of paint adsorbed at the sharp corners of the deep groove. In addition, appropriately reduce the spraying voltage and increase the powder supply to reduce the charge intensity of the powder particles and reduce their accumulation at the edge of the groove, allowing more powder to enter the deep groove with the airflow.

[0054] This section will further explain the working principle of the spray gun:

[0055] by Figure 1 and Figure 2 For example, airflow and powder enter the electrostatic spray gun, where the powder becomes charged inside the gun and is then ejected from the head. Electrostatic spray guns offer two spraying methods: linear and circular. Figure 1 and Figure 2 As can be seen, for flat surface spraying requirements, electrostatic spray guns can effectively form a uniform coating on the sprayed surface.

[0056] Please see Figure 3 The structure on the aluminum profile is simplified here. For the bottom of the groove, there is a certain difficulty in spraying, for the following reasons:

[0057] The principle of electrostatic spraying is to use a high-voltage electric field to charge the powder. The charged powder moves towards and is attracted to the grounded aluminum profile (positive electrode) under the action of Coulomb force. However, the tank of the aluminum profile is a closed or semi-closed cavity structure. When the electric field lines generated by the external electrode irradiate the tank opening, the electric field lines will preferentially concentrate at the sharp edge of the tank opening, resulting in extremely high electric field intensity at the tank opening, while the electric field intensity inside the tank decreases sharply, forming an "electric field dead zone".

[0058] Charged powder particles are attracted by the strong electric field at the opening of the tank and are difficult to enter the tank. Even if a small amount of powder enters, it will not be able to overcome gravity or airflow disturbance due to insufficient electric field force in the tank, and will not be able to adhere stably to the tank wall, ultimately resulting in missed spraying in the tank and insufficient coating thickness.

[0059] The technical solutions in this application will be further described in detail below with reference to the accompanying drawings.

[0060] This application discloses a powder coating equipment for aluminum profiles. In some examples, the powder coating equipment for aluminum profiles disclosed in this application includes a spraying robotic arm 1, an adjustment frame 2, a position adjustment module 21, a swing module 31, a first adjustment plate 32, a negative pressure chamber 33, and a negative pressure hole 34.

[0061] Please see Figure 4The spraying robotic arm 1 uses a multi-degree-of-freedom robotic arm. An electrostatic powder spray gun is installed at the working end of the spraying robotic arm 1. In actual use, there are multiple robotic arms. These robotic arms are arranged sequentially along the moving direction of the aluminum profile and are responsible for spraying the surface of the aluminum profile. The spraying robotic arm 1 described in this application is mainly responsible for spraying the groove area on the aluminum profile. The specific location is deployed according to process requirements, etc., and is not limited here.

[0062] Figure 4 The middle arrow indicates the direction of movement of the aluminum profile (the structure is for illustrative purposes only). There are four spraying robotic arms 1, each responsible for spraying different positions on the aluminum profile. One of the spraying robotic arms 1 is responsible for spraying the grooves on the aluminum profile.

[0063] like Figure 5 As shown, the adjustment frame 2 is fixedly installed on the spraying robot arm 1. Two position adjustment modules 21 are symmetrically installed on the adjustment frame 2. Two swing modules 31 are respectively installed on the two position adjustment modules 21. The function of the position adjustment module 21 is to change the distance between the two swing modules 31, so as to cope with different groove widths.

[0064] In some possible implementations, the position adjustment module 21 includes a slide rail, a slider slidably connected to the slide rail, and a linear motor, the telescopic end of which is connected to the slider to drive the slider to move on the slide rail.

[0065] In some possible implementations, the swing module 31 consists of two parts: a turntable mounted on the slider and a motor mounted on the slider. The motor and the turntable are engaged by a set of transmission gears.

[0066] contrast Figure 5 and Figure 6 It can be seen that when the swing module 31 rotates, it can drive the first adjustment plate 32 from the spraying position to the non-spraying position, and the rotation angle is generally between 60° and 90°.

[0067] The non-coating position refers to the position where the first adjusting plate 32 does not affect the normal operation of the electrostatic powder spray gun. In other words, in this application, one electrostatic powder spray gun can simultaneously spray the flat surface of the aluminum profile, such as... Figure 1 As shown, the grooves on the aluminum profile can also be sprayed.

[0068] Two first adjustment plates 32 are respectively mounted on two swing modules 31, such as Figure 7 As shown, there is a negative pressure chamber 33 inside the first adjusting plate 32, and negative pressure holes 34 are evenly distributed on the working surface of the first adjusting plate 32. These negative pressure holes 34 are all connected to the negative pressure chamber 33.

[0069] When working, the negative pressure port 34 is connected to the negative pressure module (composed of a vacuum pump and a gas storage tank) through a pipeline (the pipeline is connected to the negative pressure chamber 33 through an air nozzle). Some powder particles between the two first regulating plates 32 will enter the negative pressure chamber 33 through the negative pressure port 34. The powder particles in the negative pressure chamber 33 are carried by the airflow into the cyclone separator deployed at the front end of the gas storage tank. After separation, the powder particles are intercepted, the airflow enters the gas storage tank, and is then extracted by the vacuum pump.

[0070] In some examples, the inner wall of the negative pressure chamber 33 is provided with a flexible adjustment element 4. The flexible adjustment element 4 is used to adjust the flow area of ​​the negative pressure hole 34. The purpose of adjusting the flow area of ​​the negative pressure hole 34 is to change the process parameters. For example, in different spraying requirements, the amount of powder particles conveyed per unit time is different. At this time, it can be adjusted by changing the flow area of ​​the negative pressure hole 34.

[0071] Please see Figure 7 The flexible adjustment component 4 includes a guide beam 41, a flexible plate 42, and a driver 43. Multiple guide beams 41 are spaced apart on the working surface of the first adjustment plate 32 or on the inner wall of the negative pressure chamber 33. The flexible plate 42 passes sequentially through the gap between each guide beam 41 and the first adjustment plate 32. The driver 43 is fixed on the first adjustment plate 32 and connected to the flexible plate 42.

[0072] In some possible implementations, the actuator 43 uses a miniature electric cylinder, the telescopic rod of which is bonded to the flexible plate 42.

[0073] In some possible implementations, a set of actuators 43 are deployed on each side of the flexible plate 42.

[0074] In some possible implementations, the flexible plate 42 is made of rubber material and has flexible adjustment holes that match the negative pressure holes 34. The flexible adjustment holes can be made directly on the flexible plate 42 using a hole punch.

[0075] Please see Figure 8 The guide beam 41 is fixed at intervals on the working surface of the first adjusting plate 32, so that the flexible plate 42 can fit against the working surface of the first adjusting plate 32.

[0076] In some possible implementations, the flexible plate 42 is also provided with an airflow guide shell 44. The number of airflow guide shells 44 is the same as the number of flexible adjustment holes and they correspond one-to-one. The airflow guide shells 44 and the corresponding flexible adjustment holes form an adjustment channel, and the orientation of the adjustment channel is not perpendicular to the plane where the flexible adjustment holes are located.

[0077] In some possible implementations, the airflow guide shell 44 is manufactured using a hot pressing method.

[0078] The function of the airflow guide shell 44 is to reduce the impact of airflow on powder particles, in contrast. Figure 9 and Figure 10 As can be seen, the airflow guide shell 44 can effectively limit the influence range of the airflow, and can avoid the impact of the recovery process on the normally flowing powder particles while recovering some powder particles.

[0079] In some examples, please refer to Figure 6 The first adjusting plate 32 includes two horizontal segments 321 and an arc-shaped segment 322 located between the two horizontal segments 321. At the same time, it is required that when the two first adjusting plates 32 are in the spraying position, the distance between the horizontal segments 321 on the two first adjusting plates 32 is not equal.

[0080] Specifically, the distance between the two horizontal segments 321 on the side away from the spraying robot arm 1 is smaller than the distance between the two horizontal segments 321 on the other side. This is because after the recycling process of the first adjusting plate 32, the density of the spraying particles at the edge of the spraying particle airflow will decrease. By reducing the distance, the spraying particles at the edge of the spraying particle airflow can be squeezed to increase the density of the spraying particles at this location.

[0081] In some examples, the negative pressure hole 34 is located on the arc-shaped section 322 of the first adjusting plate 32 and the horizontal section 321 near the position adjustment module 21. That is, when the sprayed particles are about to flow out between the two first adjusting plates 32, the sprayed particles are no longer recycled, in order to avoid uneven distribution of the sprayed particles.

[0082] In some possible implementations, an antistatic coating is applied to the working surface of the horizontal segment 321 away from the position adjustment module 21.

[0083] In some examples, a guide adjustment member 5 is provided on the working surface of the horizontal segment 321 away from the position adjustment module 21. The guide adjustment member 5 is used to adjust the tilt angle of the horizontal segment 321 away from the position adjustment module 21.

[0084] The guide adjustment component 5 includes a flexible sheet 51, a second adjustment plate 52, and an adjustment plate driver 53. The edge portion of the flexible sheet 51 is bonded to the horizontal segment 321 away from the position adjustment module 21. The second adjustment plate 52 is bonded to the inner side of the flexible sheet 51 and hinged to the horizontal segment 321 away from the position adjustment module 21.

[0085] The two ends of the adjustment plate driver 53 are connected to the flexible sheet 51 and the horizontal section 321 away from the position adjustment module 21, respectively, to drive the second adjustment plate 52 to swing.

[0086] Specifically, as mentioned above, the distance between the two first adjusting plates 32 can be adjusted. However, if the gap width between the ends of the two first adjusting plates 32 still needs to be adjusted after the distance fixing rod is adjusted, it cannot be continued. In order to solve this problem, this application uses a guide adjusting member 5.

[0087] For example, for some narrow grooves, when the distance between the two first adjusting plates 32 cannot be reduced further, it can be further reduced by the guide adjusting member 5, such as... Figure 11 As shown.

[0088] In some possible implementations, the flexible sheet 51 is made of a rubber material, and the second adjusting plate 52 is made of a rigid material or hard plastic. Considering the small adjustment gap here, the adjusting plate actuator 53 uses an airbag, which is connected to an air line (…). Figure 11 (The dotted line in the diagram) connects to the gas source.

[0089] Please see Figure 12 and Figure 13 The powder coating equipment for aluminum profiles disclosed in this application is preferably used in conjunction with linear nozzles. Figure 12 The dashed line represents the spraying area, and the arrow indicates the direction of movement. When spraying the trench, the nozzle rotates 90 degrees, and the spraying area is limited by the technical solution provided in this application, confining the spraying area to the inside of the trench.

[0090] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A powder coating equipment for aluminum profiles, characterized in that, include: Spray painting robotic arm (1); Adjustment frame (2) is mounted on the spraying robot arm (1); Two position adjustment modules (21) are symmetrically arranged on the adjustment frame (2); Two swing modules (31) are respectively set on two position adjustment modules (21), and the distance between the two swing modules (31) can be adjusted; Two first adjustment plates (32) are respectively set on two swing modules (31), and the two swing modules (31) are used to drive the two first adjustment plates (32) to adjust between the spraying position and the non-spraying position; The negative pressure chamber (33) is located inside the first regulating plate (32); Negative pressure holes (34) are evenly distributed on the working surface of the first adjusting plate (32) and communicate with the negative pressure chamber (33); The inner wall of the negative pressure chamber (33) is provided with a flexible adjustment element (4), which is used to adjust the flow area of ​​the negative pressure hole (34); The first adjusting plate (32) includes two horizontal segments (321) and an arc segment (322) located between the two horizontal segments (321). When the two first adjustment plates (32) are in the spraying position, the distance between the horizontal sections (321) on the two first adjustment plates (32) is not equal.

2. The powder coating equipment for aluminum profiles according to claim 1, characterized in that, The flexible adjustment element (4) includes: Multiple guide beams (41) are spaced apart on the working surface of the first adjusting plate (32) or on the inner wall of the negative pressure chamber (33); The flexible plate (42) passes sequentially through the gap between each guide beam (41) and the first adjusting plate (32). Flexible adjusting holes matching the negative pressure holes (34) are evenly distributed on the flexible plate (42). The driver (43) is located on the first adjustment plate (32) and connected to the flexible plate (42).

3. The powder coating equipment for aluminum profiles according to claim 2, characterized in that, The flexible plate (42) is also provided with an airflow guide shell (44), and the number of airflow guide shells (44) is the same as that of the flexible adjustment holes and they correspond one-to-one. The airflow guide shell (44) and the corresponding flexible adjustment hole form an adjustment channel, and the orientation of the adjustment channel is not perpendicular to the plane where the flexible adjustment hole is located.

4. The powder coating equipment for aluminum profiles according to claim 1, characterized in that, The negative pressure hole (34) is located on the arc-shaped section (322) of the first adjustment plate (32) and the horizontal section (321) near the position adjustment module (21).

5. The powder coating equipment for aluminum profiles according to claim 4, characterized in that, An antistatic coating is applied to the working surface of the horizontal section (321) away from the position adjustment module (21).

6. The powder coating equipment for aluminum profiles according to claim 1, characterized in that, A guide adjustment component (5) is provided on the working surface of the horizontal section (321) away from the position adjustment module (21). The guide adjustment component (5) is used to adjust the tilt angle of the horizontal section (321) away from the position adjustment module (21).

7. The powder coating equipment for aluminum profiles according to claim 6, characterized in that, The guide adjustment component (5) includes: The flexible sheet (51) has its edge portion bonded to the horizontal segment (321) away from the position adjustment module (21); The second adjustment plate (52) is bonded to the inner side of the flexible sheet (51) and hinged to the horizontal segment (321) away from the position adjustment module (21); The adjustment plate driver (53) is connected at both ends to the flexible sheet (51) and the horizontal section (321) away from the position adjustment module (21), respectively.

Images