Electrostatic spraying system capable of rapidly replacing powder coating

Abstract

The utility model provides an electrostatic spraying system capable of rapidly replacing powder coating, and belongs to the technical field of powder electrostatic spraying. According to the technical scheme, the powder spraying device comprises a spraying rotary cup, an air line, a powder pipe and an air supply device. The spraying rotary cup comprises a rotary cup head, a forming air cover, a turbine motor, a rotary cup body and an electrostatic generator. The air line comprises a pressure maintaining air line, an atomization forming air line, a turbine motor driving air line and a rotary cup cleaning air line. Air inlet connectors with different functions are arranged in the spraying rotary cup, aerodynamic force is provided for centrifugal dispersion and atomization of powder coating, the coating quality of spraying smoothness and uniformity is guaranteed, and waste of the powder coating is effectively avoided. Most importantly, due to the arrangement of the pressure maintaining gas pipeline and the connector of the spraying rotary cup, the function of rapidly replacing the powder coating on line of the spraying rotary cup is effectively guaranteed, it is guaranteed that the powder coating is rapidly replaced and cleaned under the condition that operation of a production line is not suspended, and waste of the powder coating and a coated base material is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic spraying, in particular to an electrostatic spraying system for rapidly replacing powder coatings. Background Art

[0002] Electrostatic powder spraying is the process of applying powder coating to the substrate through electrostatic action and forming a coating by baking at a certain temperature for a certain period of time. Electrostatic powder coating is a coating method that uses the induction effect of high-voltage electric field to induce the powder coating and the coated object to carry opposite charges, thereby attracting the powder coating to the coated object. The electrostatic powder spraying system is that when the powder coating passes through the high-voltage electrostatic sprayer, the powder coating is charged with static electricity and is attracted to the coated object with the opposite charge, and then the coated object is placed in a baking oven for baking and leveling to form a film.

[0003] The electrostatic powder spraying system is generally provided with a driving air pipeline connected to the compressed air pipeline, a molding air pipeline and a powder supply pipeline for powder output spraying. When it changes to powder coatings of different colors or different texture functions, it is necessary to stop the original powder coating supply, and then consume the powder coating of the remaining powder tube and its spraying system, and then pause the production line and replace the new powder coating. At this time, some of the original powder coating still remains in the spraying system, which needs to be sprayed together with the newly replaced powder coating. At this time, the sprayed coated substrate is treated as waste and needs to be cut off before winding, which will cause unnecessary waste of powder coating and waste of the coated substrate. Therefore, in order to solve the problem that the electrostatic powder spraying system cannot replace the powder coating in the system online, it is necessary to develop an electrostatic spraying system that can quickly replace the powder coating. Summary of the invention

[0004] The utility model aims to provide an electrostatic spraying system for quickly replacing powder coatings which has simple operation and can realize online replacement of powder coatings.

[0005] The utility model is achieved through the following measures:

[0006] An electrostatic spraying system for rapid replacement of powder coatings, comprising a spraying rotary cup, an air circuit, a powder hose, an air supply device, and a powder supply device; the spraying rotary cup comprises a rotary cup head, a forming air cover, a turbine motor, a rotary cup body, and an electrostatic generator; the air circuit comprises a pressure-maintaining air pipeline, an atomizing forming air pipeline, a turbine motor driving air pipeline, and a rotary cup cleaning air pipeline; one end of the powder hose is connected to the powder supply device through a powder feed pump, and the other end is connected to the spraying rotary cup; one end of the air circuit is connected to the air supply device, and the other end is connected to the spraying rotary cup;

[0007] The spraying bell comprises a bell head, a molding air cover, a turbine motor, an electrostatic generator, and a bell body from the front end to the rear end. The electrostatic generator is built into the bell body. A molding cavity is arranged in the molding air cover. The turbine motor is built into the molding cavity. The bell head is arranged at the rotating end of the turbine motor by magnetic attraction. The turbine motor comprises two sets of upper and lower bearings arranged coaxially. A sealing gasket is arranged between the bearings to help enhance the sealing effect, prevent impurities, dust, moisture, etc. from entering the bearings, and ensure the normal operation and service life of the bearings.

[0008] The bell cup body and the forming cavity are separated by a closed joint gland, and the joint gland is provided with an air line joint, a powder pipe joint and a communication joint. The air line joint includes a pressure-maintaining air pipeline joint, an atomizing forming air pipeline joint, a turbine motor driving air pipeline joint, and a bell cup cleaning air pipeline joint.

[0009] The specific features of the utility model also include:

[0010] One end of the pressure-maintaining air pipeline joint is connected to the pressure-maintaining air pipeline, and the other end is connected to the turbine motor bearing. The air supply device is connected to the pressure-maintaining air pipeline to transport pressure-maintaining air through the turbine motor to ensure that the spray cup replaces the powder coating. When the purge air back-blows to clean the residual powder coating in the bell head, the powder coating in the bell head is prevented from flowing back into the turbine motor.

[0011] One end of the atomizing forming air pipeline connector is connected to the atomizing forming air pipeline, and the other end is connected to the atomizing nozzle in the forming cavity. The atomizing forming air is delivered through the air supply device connected to the atomizing forming air pipeline, so that the powder coating carrying electrostatic charge through the electrostatic high-voltage generator is dispersed and atomized by the rotation of the turbine motor.

[0012] One end of the turbine motor driving air pipeline connector is connected to the turbine motor driving air pipeline, and the other end is connected to the pneumatic input end of the turbine motor. The driving air is delivered through the air supply device connected to the turbine motor driving air pipeline. The gas flows through the turbine motor to drive the turbine motor to rotate, so that the spray powder is thrown out from the spray cup.

[0013] One end of the rotary cup cleaning air pipeline connector is connected to the rotary cup cleaning air pipeline, and the other end is connected to the rotary cup head. Clean air is delivered through the air supply device connected to the rotary cup cleaning air pipeline to protect the spraying rotary cup from being cleaned and prevent the tip of the rotary cup head electrode from absorbing too much powder.

[0014] A regulating valve is provided at the inlet of the air supply device to adjust the pipeline pressure and flow rate. Sub-regulating valves are respectively provided on the air lines connected to the air supply device to adjust the pipeline pressure and flow rate of each air line. When the spray cup, powder supply device, powder feed pump and powder tube are cleaned by changing color with a compressed air gun, it is necessary to ensure that the regulating valves of the pressure-maintaining air pipeline and the turbine motor driving air pipeline are opened to ensure a continuous supply of turbine motor driving air and clean pressure-maintaining air, so as to protect the bearings, improve cleaning efficiency and ensure that the turbine motor will not be contaminated by powder.

[0015] One end of the powder pipe joint is connected to a powder supply device through a powder pipe via a powder feed pump, and the powder supply device supplies powder coating to the powder pipe joint. A powder pipe is provided at the other end of the powder pipe joint, and the powder pipe is connected to the spraying bell. The powder coating enters from the powder pipe joint, flows through the powder pipe, and generates huge centrifugal force under the high-speed rotation of the spraying bell, so that the powder coating is thrown out from the spraying bell.

[0016] The beneficial effects of the utility model are as follows: the utility model provides an electrostatic spraying system for quickly replacing powder coating, and the air inlet joints with different functions are arranged in the spraying bell, which provide air power for the centrifugal dispersion atomization of powder coating, ensure the smooth and uniform coating quality of spraying, and effectively avoid the waste of powder coating. The most important thing is that the setting of the pressure-maintaining air pipeline and joint of the spraying bell effectively ensures the function of the spraying bell to quickly replace powder coating online, ensures that the powder coating can be quickly replaced without suspending the production line operation, and effectively reduces the material waste of powder coating and coated substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system composition of the utility model.

[0018] Figure 2 It is a schematic diagram of the spraying rotary cup structure in the embodiment of the utility model.

[0019] Figure 3 This is a cross-sectional diagram of a spray cup according to an embodiment of the utility model.

[0020] Figure 4 Schematic diagram of the structure of the air line connector of this embodiment.

[0021] The reference numerals are: 1. Spraying cup, 2. Air line, 3. Powder hose, 4. Air supply device, 5. Powder supply device, 6. Communication connector, 7. Connector gland;

[0022] 101. cup head, 102. forming air hood, 103. turbine motor, 104. rotary cup body, 105. electrostatic generator; 1021. atomizing nozzle hole, 1022. forming cavity, 1031. bearing; 201A. atomizing forming air pipeline, 202A. rotary cup cleaning air pipeline, 203A. turbine motor driving air pipeline, 204A. pressure maintaining air pipeline, 201B. atomizing forming air pipeline joint, 202B. rotary cup cleaning air pipeline joint, 203B. turbine motor driving air pipeline joint, 204B. pressure maintaining air pipeline joint; 301. powder pipe joint, 401. regulating valve, 501. powder feed pump. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0027] See also Figure 1, an electrostatic spraying system for rapid replacement of powder coating, comprising a spraying bell 1, an air circuit 2, a powder tube 3, an air supply device 4, and a powder supply device 5; the spraying bell 1 comprises a bell head 101, a molding air hood 102, a turbine motor 103, a bell body 104, and an electrostatic generator 105, the air circuit 2 comprises a pressure-maintaining air pipeline 204A, an atomizing molding air pipeline 201A, a turbine motor driving air pipeline 203A, and a bell cleaning air pipeline 202A, one end of the powder tube 3 is connected to the powder supply device 5 through a powder feed pump 501, and the other end is connected to the spraying bell 1, one end of the air circuit 2 is connected to the air supply device 4, and the other end is connected to the spraying bell 1.

[0028] like Figure 2 and Figure 3 As shown, the spraying bell 1 comprises, from front to rear end, a bell head 101, a molding air hood 102, a turbine motor 103, an electrostatic generator 105, and a bell body 104. The electrostatic generator 105 is built in the bell body 104. A molding cavity 1022 is arranged in the molding air hood 102. The turbine motor 103 is built in the molding cavity 1022. The bell head 101 is arranged at the rotating end of the turbine motor 103 by magnetic attraction. The turbine motor 103 includes two sets of upper and lower bearings 1031 arranged coaxially. A sealing gasket is arranged between the bearings 1031 to help enhance the sealing effect, prevent impurities, dust, moisture, etc. from entering the bearing 1031, and ensure the normal operation and service life of the bearing 1031.

[0029] like Figure 4 As shown, the bell body 104 and the forming cavity 1022 are separated by a closed joint gland 7, and the joint gland 7 is provided with an air line 2 joint, a powder pipe joint 301 and a communication joint 6, and the air line 2 joint includes a pressure-maintaining air pipeline joint 204B, an atomizing forming air pipeline joint 201B, a turbine motor driving air pipeline joint 203B, and a bell cleaning air pipeline joint 202B, wherein the communication joint 6 is connected to the controller through a cable to output electrostatic high voltage.

[0030] Furthermore, one end of the pressure-maintaining air pipeline connector 204B is connected to the pressure-maintaining air pipeline 204A, and the other end is connected to the bearing 1031 of the turbine motor 103. The pressure-maintaining air is delivered to the turbine motor 103 through the connection of the air supply device 4 with the pressure-maintaining air pipeline 204A, thereby ensuring that the spray cup 1 replaces the powder coating, and when the purge air back-blows to clean the residual powder coating in the cup head 101, the powder coating in the cup head 101 is prevented from flowing back to the turbine motor 103.

[0031] Furthermore, one end of the atomizing molding air pipeline connector 201B is connected to the atomizing molding air pipeline 201A, and the other end is connected to the atomizing nozzle 1021 in the molding cavity 1022. The atomizing molding air is delivered through the air supply device 4 connected to the atomizing molding air pipeline 201A, so that the powder coating carrying electrostatic charge through the electrostatic high-voltage generator 105 is rotated centrifugally and dispersed into atomization through the turbine motor 103.

[0032] Furthermore, one end of the turbine motor driving air pipeline 203B connector is connected to the turbine motor driving air pipeline 203A, and the other end is connected to the pneumatic input end of the turbine motor 103. The driving air is connected to the turbine motor driving air pipeline 203A through the air supply device 4. The gas flows through the turbine motor 103 to drive the turbine motor to rotate, so that the spray powder is thrown out from the spray cup 1.

[0033] Furthermore, one end of the rotary cup cleaning air pipeline connector 202B is connected to the rotary cup cleaning air pipeline 202A, and the other end is connected to the rotary cup head 101. The clean air is delivered through the air supply device 4 connected to the rotary cup cleaning air pipeline 202A to protect the spraying rotary cup 1 from being cleaned and prevent the tip of the electrode of the rotary cup head 101 from adsorbing too much powder.

[0034] The inlet of the air supply device 4 is provided with a regulating valve 401 to adjust the pipeline pressure and flow rate. The air lines 2 connected to the air supply device 4 are respectively provided with sub-regulating valves to adjust the pipeline pressure and flow rate of each air line. When the spray cup 1, the powder supply device 5, the powder feed pump 501 and the powder tube 3 are cleaned by changing the color, a compressed air gun is used for cleaning. It is necessary to ensure that the regulating valves 401 of the pressure-maintaining air pipeline 204A and the turbine motor drive air pipeline 203A are opened to ensure a continuous supply of turbine motor drive air and clean pressure-maintaining air, so as to protect the bearing 1031 and improve the cleaning efficiency, and ensure that the turbine motor 103 will not be contaminated by powder.

[0035] One end of the powder pipe joint 301 is connected to the powder supply device 5 through the powder pipe 3 via the powder feed pump 501, and the powder supply device 5 supplies powder coating to the powder pipe joint 301. The other end of the powder pipe joint 301 is provided with a powder pipe 3, and the powder pipe 3 is connected to the spraying bell 1. The powder coating enters from the powder pipe joint 301, flows through the powder pipe 3, and then, under the high-speed rotation of the spraying bell 1, the powder coating generates huge centrifugal force, and the powder coating is thrown out from the spraying bell 1.

[0036] Before starting the spraying bell 1, ensure that the regulating valve 401 on the air supply device 4 and the air line 2 is open, turn on the main power of the system, first start the spraying bell 1 to rotate, set the speed of the spraying bell 1, usually set it to 6000~8000rpm, and the maximum is not more than 12000rpm, open the regulating valve 401 on the air line 2, set the appropriate pressure value for each air line 2, generally the pressure-maintaining air pipeline 204A is set at 0.02~0.05MPa during spraying, and at 0.02~0.05MPa during cleaning. 0.6~0.7MPa, the rotary cup cleaning air pipeline 202A is set at 0.06~0.1MPa, after the regulating valve 401 is set to a suitable pressure value, wait until the speed of the spray rotary cup 1 reaches the set value or fluctuates smoothly around the set value (plus or minus 10% fluctuation is allowed), and the product and the back-coated substrate are in place, the spray rotary cup 1 turns on the electrostatic high voltage and outputs powder coating, sets suitable spraying parameters, adjusts parameters such as electrostatic high voltage, electrostatic current, powder output amount, powder atomization gas size, and starts spraying operation.

[0037] When the spraying bell 1 is cleaned or replaced with new powder coating, the powder feed pump 501 stops feeding powder and stops the input of electrostatic high voltage. At the same time, the regulating valves 401 of the atomizing forming air pipeline 201A and the bell cleaning air pipeline 202A are closed, the regulating valve 401 of the turbine motor driving air pipeline 203A is kept open, and the regulating valve 401 of the pressure-maintaining air pipeline 204A is fully opened. Then, the bell head 101 of the spraying bell 1 is backblown by an air gun connected to the air supply device 4 to blow out the residual powder coating. Since the pressure-maintaining air pipeline 204A and the turbine motor driving air 203A continuously supply air, the powder coating is prevented from flowing back into the turbine motor 103 and the corresponding bearing 1031 during backblowing, thereby completing the rapid replacement of the powder coating online and reducing the waste of powder coating and the coated substrate.

[0038] Technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be elaborated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. An electrostatic spraying system for rapid replacement of powder coating, characterized in that: It includes a spraying rotary cup, an air circuit, a powder hose, an air supply device, and a powder supply device; the spraying rotary cup includes a rotary cup head, a molding air cover, a turbine motor, a rotary cup body, and an electrostatic generator; the air circuit includes a pressure-maintaining air pipeline, an atomizing molding air pipeline, a turbine motor driving air pipeline, and a rotary cup cleaning air pipeline; one end of the powder hose is connected to the powder supply device through a powder feed pump, and the other end is connected to the spraying rotary cup; one end of the air circuit is connected to the air supply device, and the other end is connected to the spraying rotary cup; The spraying bell comprises a bell head, a molding air cover, a turbine motor, an electrostatic generator, and a bell body from the front end to the rear end, wherein the electrostatic generator is built in the bell body, a molding cavity is arranged in the molding air cover, the turbine motor is built in the molding cavity, the bell head is arranged at the rotating end of the turbine motor by magnetic attraction, and the turbine motor comprises two sets of upper and lower bearings arranged coaxially, and a sealing gasket is arranged between the bearings; The bell cup body and the forming cavity are separated by a closed joint gland, and the joint gland is provided with an air line joint, a powder pipe joint and a communication joint. The air line joint includes a pressure-maintaining air pipeline joint, an atomizing forming air pipeline joint, a turbine motor driving air pipeline joint, and a bell cup cleaning air pipeline joint.

2. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: One end of the pressure-maintaining air pipeline joint is connected to the pressure-maintaining air pipeline, and the other end is connected to the turbine motor bearing. The air supply device is connected to the pressure-maintaining air pipeline to transport pressure-maintaining air through the turbine motor to ensure that the spray cup replaces the powder coating. When the purge air back-blows to clean the residual powder coating in the bell head, the powder coating in the bell head is prevented from flowing back into the turbine motor.

3. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: One end of the atomizing forming air pipeline connector is connected to the atomizing forming air pipeline, and the other end is connected to the atomizing nozzle in the forming cavity. The atomizing forming air is delivered through the air supply device connected to the atomizing forming air pipeline, so that the powder coating carrying electrostatic charge through the electrostatic high-voltage generator is dispersed and atomized by the rotation of the turbine motor.

4. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: One end of the turbine motor driving air pipeline connector is connected to the turbine motor driving air pipeline, and the other end is connected to the pneumatic input end of the turbine motor. The driving air is delivered through the air supply device connected to the turbine motor driving air pipeline. The gas flows through the turbine motor to drive the turbine motor to rotate, so that the spray powder is thrown out from the spray cup.

5. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: One end of the rotary cup cleaning air pipeline connector is connected to the rotary cup cleaning air pipeline, and the other end is connected to the rotary cup head. Clean air is delivered through the air supply device connected to the rotary cup cleaning air pipeline to protect the spraying rotary cup from being cleaned and prevent the tip of the rotary cup head electrode from absorbing too much powder.

6. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: The inlet of the air supply device is provided with a regulating valve to adjust the pipeline pressure and flow rate. The air lines connected to the air supply device are respectively provided with sub-regulating valves to adjust the pipeline pressure and flow rate of each air line.

7. The electrostatic spraying system for rapid replacement of powder coating according to claim 1, characterized in that: One end of the powder pipe joint is connected to a powder supply device through a powder pipe via a powder feed pump, and the other end of the powder pipe joint is provided with a powder pipe, and the powder pipe is communicated with the spraying rotary cup.

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