Plastic powder recycling device for plastic spraying machine

Abstract

This application relates to the field of powder coating equipment technology, and in particular to a powder coating machine powder recovery device, including a frame housing, a filter element, a negative pressure fan, and a powder cleaning structure. The frame housing has a working chamber for accommodating the workpiece to be coated. The filter element is detachably connected to the frame housing and is disposed in the working chamber. The negative pressure fan creates a negative pressure environment inside the filter element to force the powder coating in the air to be adsorbed onto the outer surface of the filter element. The powder cleaning structure is used to shake off the powder coating on the filter element, and a collection chamber is provided at the bottom of the frame housing for collecting the shaken-off powder coating. In this application, the powder cleaning structure is used to periodically clean the powder coating accumulated on the filter element, thereby reducing the thickness of the powder layer on the outer periphery of the filter element; this improves the negative pressure adsorption effect of the negative pressure fan on the powder coating, thereby reducing the filtration resistance of the filter element and improving the powder coating recovery effect.

Description

Technical Field

[0001] This application relates to the field of powder coating equipment technology, and in particular to a powder coating machine powder recycling device. Background Technology

[0002] Powder coating machines primarily operate on the principle of electrostatic adsorption. Electrostatic powder coating equipment sprays powder coating onto the workpiece surface. Under the influence of electrostatics, the negatively charged powder adheres evenly to the positively charged workpiece surface, forming a powdery coating. This powdery coating is then baked at high temperature to achieve leveling and curing, becoming the final coating.

[0003] In electrostatic powder coating equipment, some of the powder coating adheres to the workpiece surface, while some disperses into the air. Existing technology utilizes a powder recovery device to collect the airborne powder coating. This system employs a negative pressure fan to draw in the airborne powder coating, causing it to adhere to the filter element. The powder coating on the filter element is then collected in a collection container. However, in this powder recovery device, the powder coating gradually accumulates on the filter element surface, forming a dust layer. As the dust layer thickens, the filtration resistance of the filter element increases significantly, thus affecting the filtration and recovery efficiency of the powder recovery device. Utility Model Content

[0004] In order to improve the filtration and recycling effect of the plastic powder recovery device, this application provides a plastic powder recovery device for a powder coating machine.

[0005] This application provides a powder recycling device for a powder coating machine, which adopts the following technical solution:

[0006] A powder coating machine powder recovery device includes a frame housing, a filter element, a negative pressure fan, and a powder cleaning structure. The frame housing has a working chamber for accommodating the workpiece to be coated. The filter element is detachably connected to the frame housing and is disposed in the working chamber. The negative pressure fan creates a negative pressure environment inside the filter element to force the powder coating in the air to adhere to the outer surface of the filter element. The powder cleaning structure is used to shake off the powder coating on the filter element. The bottom of the frame housing has a collection chamber for collecting the shaken-off powder coating.

[0007] By adopting the above technical solution, the worker places the workpiece to be coated in the working chamber of the frame housing, and the workpiece can be suspended from the top of the working chamber. When the electrostatic powder coating equipment sprays powder coating onto the surface of the workpiece, the powder coating dispersed in the air flows towards the filter element under the action of the negative pressure fan; that is, under the synergistic action of the negative pressure fan and the filter element, the powder coating dispersed in the air is recovered to the outer circumference of the filter element. The powder cleaning structure causes the powder coating on the outer circumference of the filter element to fall onto the frame housing at the bottom of the working chamber. The worker can use a brush to collect the powder coating at the bottom of the working chamber to the collection port, and the powder coating falls into the collection drawer through the collection port.

[0008] In this technical solution, the powder coating accumulated on the filter element is periodically cleaned by the plastic powder cleaning structure, thereby reducing the thickness of the powder layer on the outer periphery of the filter element; thereby improving the negative pressure adsorption effect of the negative pressure fan on the powder coating, reducing the filtration resistance of the filter element, and improving the recovery effect of the powder coating.

[0009] Optionally, the frame housing is provided with an airflow chamber, and the frame housing has an air extraction port for connecting the airflow chamber and the working chamber. At least two filter elements are provided, and the filter elements cover the air extraction port. The negative pressure fan is provided on the frame housing, and the air duct of the negative pressure fan is connected to the airflow chamber. The negative pressure fan is used to extract gas from the airflow chamber and the filter elements.

[0010] By adopting the above technical solution and setting up an airflow chamber, the powder recovery device can be equipped with multiple filter elements to improve the recovery effect of powder coatings.

[0011] Optionally, the powder coating cleaning structure includes an air storage cylinder, a solenoid valve switch, an air supply pipe, and a controller; the air storage cylinder stores compressed air, the first end of the air supply pipe is connected to the air storage cylinder, the second end of the air supply pipe passes through the air extraction port, the second end of the air supply pipe is located inside the filter element, the solenoid valve switch is located on the air supply pipe, and the controller is used to control the opening and closing of the solenoid valve switch; when the solenoid valve switch is open, the air supply pipe sprays airflow into the filter element to shake off the powder coating on the outer periphery of the filter element.

[0012] By adopting the above technical solution, the controller in the powder coating cleaning structure can control the operation of the solenoid valve switch at intervals, so that the solenoid valve switches release high-pressure gas at intervals, thereby forming short high-pressure airflows (pulses) inside the filter element to shake off the powder coating on the outer periphery of the filter element.

[0013] Optionally, the frame housing has a collection port for connecting the collection chamber and the working chamber; the frame housing has a collection drawer disposed in the collection chamber for receiving powder coating that falls from the collection port.

[0014] By adopting the above technical solution, the fallen powder coating can be collected in a collection drawer, making it easier for staff to operate.

[0015] Optionally, the filter element includes a support mesh cylinder, a filter paper cylinder, and a base plate. The base plate is disposed at the bottom of the filter element, and the support mesh cylinder and the filter paper cylinder are disposed on the base plate. The filter paper cylinder is sleeved around the outer periphery of the support mesh cylinder and is used to filter and intercept powder coatings in the air.

[0016] By adopting the above technical solution, the support mesh cylinder has greater rigidity. The support mesh cylinder is used to support the filter paper cylinder to reduce the deformation of the filter paper cylinder.

[0017] Optionally, the filter element further includes a guide tube, which is disposed inside the support mesh cylinder and vertically disposed on the base plate; the bottom of the guide tube has a plurality of vent holes, which are arranged in a ring around the outer periphery of the guide tube.

[0018] By adopting the above technical solution, when the plastic powder cleaning structure releases high-pressure gas into the filter element, part of the airflow will enter the guide tube and pass through the vent at the bottom of the guide tube to vibrate the filter paper cylinder at the bottom of the filter element.

[0019] Optionally, a flow guide ring plate is provided on the outer periphery of the flow guide tube, and the flow guide ring plate is disposed above the vent hole; along the vertical upward direction, the distance from the flow guide ring plate to the flow guide tube decreases.

[0020] By adopting the above technical solution, the guide ring plate guides the airflow, causing the airflow to flow downwards at an angle, so that the powder coating on the outer periphery of the filter paper tube falls downwards, reducing the range of powder coating drifting outwards, and making it easier for workers to collect the fallen powder coating.

[0021] Optionally, it may also include a sound-absorbing cotton board, which is disposed on the inner side wall of the airflow chamber.

[0022] By adopting the above technical solution, the sound-absorbing cotton board can absorb noise, thereby reducing the noise of the plastic powder recycling device.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The powder coating accumulated on the filter element is cleaned regularly using the plastic powder cleaning structure, thereby reducing the thickness of the powder layer on the outer periphery of the filter element; thus improving the negative pressure adsorption effect of the negative pressure fan on the powder coating, reducing the filtration resistance of the filter element, and improving the recovery effect of the powder coating;

[0025] 2. The controller in the powder coating cleaning structure can intermittently control the operation of the solenoid valve switch; so that the solenoid valve switch intermittently releases high-pressure gas; to form short high-pressure airflow (pulse) inside the filter element, so as to shake off the powder coating on the outer periphery of the filter element;

[0026] 3. The guide ring plate guides the airflow, causing it to flow downwards at an angle, so that the powder coating on the outer periphery of the filter paper tube falls downwards, reducing the range of powder coating drifting outwards, and making it easier for workers to collect the fallen powder coating. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the plastic powder recycling device in Example 1.

[0028] Figure 2 This is a schematic diagram of the plastic powder recycling device in Example 1.

[0029] Figure 3 This is a schematic diagram of the internal structure of the plastic powder recycling device in Example 1.

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure 5 This is a schematic diagram of the filter element in Example 1.

[0032] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0033] Figure 7 This is a schematic diagram of the filter element in Example 1.

[0034] Figure 8 yes Figure 7 Enlarged view of point C in the middle.

[0035] Explanation of reference numerals in the attached drawings: 1. Frame housing; 11. Collection chamber; 12. Working chamber; 13. Airflow chamber; 14. Air extraction port; 15. Collection port; 16. Collection drawer; 17. Sound-absorbing cotton board; 2. Filter element; 21. Support mesh cylinder; 22. Filter paper cylinder; 23. Base plate; 24. Guide pipe; 241. Vent hole; 25. Guide ring plate; 3. Negative pressure fan; 4. Powder cleaning structure; 41. Air storage cylinder; 42. Solenoid valve switch; 43. Air supply pipe; 44. Controller. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 -8 provides further details regarding this application.

[0037] Example 1

[0038] This application discloses a powder recycling device for a powder coating machine. (Refer to...) Figure 1 and Figure 2 The powder recovery device for powder coating machines includes a frame housing 1, a filter element 2, a negative pressure fan 3, and a powder cleaning structure 4.

[0039] Reference Figure 3 Along the vertically upward direction, the frame housing 1 is provided with a collection chamber 11, a working chamber 12, and an airflow chamber 13 in sequence. The frame housing 1 has an exhaust port 14, which is used to connect the airflow chamber 13 and the working chamber 12; the frame housing 1 has a collection port 15, which is used to connect the collection chamber 11 and the working chamber 12.

[0040] Reference Figure 1 and Figure 3 The working chamber 12 is used to hold the workpiece to be sprayed; a slide rail with a slider can be set on the top of the working chamber 12. The slider can be used to suspend the workpiece to be sprayed. The slider is slidably connected to the slide rail to move the workpiece horizontally.

[0041] Reference Figure 3 and Figure 4 The filter element 2 is detachably connected to the frame housing 1. The filter element 2 is disposed in the working chamber 12 and covers the air extraction port 14. The number of filter elements 2 can be one, two, or three, etc., and this application does not limit the number of filter elements 2. In this embodiment, at least two filter elements 2 are provided to improve the adsorption effect of the filter element 2 on the powder coating (plastic powder) in the air, so as to increase the recovery of powder coating and prevent the powder coating in the working chamber 12 from escaping to the outside.

[0042] Reference Figure 3 and Figure 4 The negative pressure fan 3 is mounted on the frame housing 1. The air duct of the negative pressure fan 3 is connected to the airflow chamber 13. The negative pressure fan 3 is used to extract gas from the airflow chamber 13 and the filter element 2. The negative pressure fan 3 creates a negative pressure environment inside the filter element 2 to force the powder coating in the air to be adsorbed onto the outer surface of the filter element 2, thereby achieving the purpose of recovering the powder coating in the air.

[0043] Reference Figure 5 and Figure 6 Referring to filter element 2, it includes a support mesh cylinder 21, a filter paper cylinder 22, and a base plate 23. The base plate 23 is located at the bottom of filter element 2, and the support mesh cylinder 21 and filter paper cylinder 22 are mounted on the base plate 23; the filter paper cylinder 22 is fitted around the outer periphery of the support mesh cylinder 21. The support mesh cylinder 21 is made of stainless steel mesh and has high rigidity. The support mesh cylinder 21 supports the filter paper cylinder 22 to reduce deformation of the filter paper cylinder 22. The filter paper cylinder 22 can be made of polyester-coated material. The filter paper cylinder 22 allows gas to pass through but does not allow particulate powder to pass through; the filter paper cylinder 22 is used to filter and intercept powder coatings in the air.

[0044] Reference Figure 2 and Figure 3 The powder cleaning structure 4 includes an air storage cylinder 41, a solenoid valve switch 42, an air supply pipe 43, and a controller 44. (Refer to...) Figure 3 and Figure 4 The air storage cylinder 41 stores compressed air. The first end of the air supply pipe 43 is connected to the air storage cylinder 41, and the second end of the air supply pipe 43 passes through the air extraction port 14. The second end of the air supply pipe 43 is located inside the filter element 2. A solenoid valve switch 42 is located on the air supply pipe 43, and a controller 44 controls the opening and closing of the solenoid valve switch 42. When the solenoid valve switch 42 is open, compressed air is ejected from the end of the air supply pipe 43 to form a short, high-pressure airflow (pulse) inside the filter element 2, dislodging the powder coating on the outer periphery of the filter element 2. In other embodiments, a nozzle can be provided at the second end of the air supply pipe 43 to improve the spray range and spray effect.

[0045] Reference Figure 1 and Figure 3 The frame housing 1 has a collection drawer 16, which is located in the collection chamber 11. When the powder cleaning structure 4 shakes off the powder coating on the filter element 2, the powder coating falls to the bottom of the working chamber 12. The operator can use a brush to collect the powder coating at the bottom of the working chamber 12 to the collection port 15, and the powder coating falls into the collection drawer 16 through the collection port 15.

[0046] Reference Figure 3 The plastic powder recovery device also includes a sound-absorbing cotton board 17, which is installed on the inner wall of the airflow chamber 13. The sound-absorbing cotton board 17 can absorb the noise generated by the negative pressure fan 3 and the noise generated by the solenoid valve switch 42 releasing high-pressure gas, thereby reducing the noise of the plastic powder recovery device during operation.

[0047] The implementation principle of a powder recycling device for a powder coating machine according to an embodiment of this application is as follows:

[0048] Reference Figure 3 The operator places the workpiece to be coated in the working chamber 12 of the frame housing 1, where the workpiece can be suspended. The negative pressure fan 3 operates to extract air from the airflow chamber 13 and the interior of the filter element 2, causing air outside the filter element 2 to flow towards it under negative pressure. Thus, when the electrostatic powder coating equipment sprays powder coating onto the workpiece surface, the powder coating dispersed in the air flows towards the filter element 2 under the action of the negative pressure fan 3. The filter paper cylinder 22 on the outer circumference of the filter element 2 intercepts the powder coating in the air, allowing air to pass through the filter paper cylinder 22 and flow into the interior space of the filter element 2. In other words, through the synergistic action of the negative pressure fan 3 and the filter element 2, the powder coating dispersed in the air is recovered to the outer circumference of the filter element 2.

[0049] Reference Figure 2 and Figure 3 The controller 44 in the powder cleaning structure 4 can intermittently control the operation of the solenoid valve switch 42, causing the solenoid valve switch 42 to intermittently release high-pressure gas, thereby forming short high-pressure airflows (pulses) inside the filter element 2 to shake off the powder coating on the outer periphery of the filter element 2. This causes the powder coating on the outer periphery of the filter element 2 to fall onto the frame housing 1 at the bottom of the chamber 12. Workers can use a brush to collect the powder coating at the bottom of the chamber 12 to the collection port 15, where it falls into the collection drawer 16. It is worth noting that when the powder cleaning structure 4 is working, the negative pressure fan 3 can stop operating to allow the powder coating on the filter element 2 to fall off. However, in this embodiment, the negative pressure fan 3 may not stop operating while the powder cleaning structure 4 is working.

[0050] In this technical solution, the powder coating accumulated on the filter element 2 is periodically cleaned by the plastic powder cleaning structure 4, thereby reducing the thickness of the powder layer on the outer periphery of the filter element 2; thereby improving the negative pressure adsorption effect of the negative pressure fan 3 on the powder coating, so as to reduce the filtration resistance of the filter element 2 and improve the recovery effect of the powder coating.

[0051] Example 2

[0052] The difference between Example 2 and Example 1 is as follows:

[0053] Reference Figure 7 and Figure 8 The filter element 2 also includes a guide tube 24 and a guide ring plate 25. The guide tube 24 is disposed inside the support mesh cylinder 21 and is vertically disposed on the base plate 23; the bottom of the guide tube 24 has several vent holes 241, which are arranged in a ring around the outer periphery of the guide tube 24, and a clearance distance is provided between the vent holes 241 and the top of the guide tube 24. The guide ring plate 25 is disposed above the vent holes 241; the distance from the guide ring plate 25 to the guide tube 24 decreases along the vertical upward direction.

[0054] The implementation principle of a powder recycling device for a powder coating machine according to an embodiment of this application is as follows:

[0055] When the solenoid valve switch 42 releases high-pressure gas at intervals to form short high-pressure airflow (pulse) inside the filter element 2, the high-pressure gas has a weaker vibration effect on the powder coating at the bottom of the filter element 2 compared to the powder coating at the top of the filter element 2, thus affecting the falling effect of the powder coating at the bottom of the filter element 2.

[0056] Reference Figure 7 and Figure 8This application incorporates a guide pipe 24 and a guide ring plate 25 inside the support mesh cylinder 21. When the powder cleaning structure 4 releases high-pressure gas into the filter element 2, some of the airflow enters the guide pipe 24 and passes through the vent hole 241 at the bottom of the guide pipe 24, thus vibrating the filter paper cylinder 22 at the bottom of the filter element 2. The guide ring plate 25 on the outer periphery of the guide pipe 24 is inclined, and the guide ring plate 25 guides the airflow, causing it to flow downwards at an angle. This allows the powder coating on the outer periphery of the filter paper cylinder 22 to fall downwards, reducing the range of powder coating dispersion and facilitating the collection of fallen powder coating by workers.

[0057] The above are all 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 plastic powder recovery device for a plastic spraying machine, characterized by: The device includes a frame housing (1), a filter element (2), a negative pressure fan (3), and a powder cleaning structure (4). The frame housing (1) has a working chamber (12) for accommodating the workpiece to be coated. The filter element (2) is detachably connected to the frame housing (1) and is located in the working chamber (12). The negative pressure fan (3) creates a negative pressure environment inside the filter element (2) to force the powder coating in the air to adhere to the outer surface of the filter element (2). The powder cleaning structure (4) is used to shake off the powder coating on the filter element (2). The bottom of the frame housing (1) has a collection chamber (11) for collecting the shaken-off powder coating.

2. The plastic powder recycling device for a plastic spraying machine according to claim 1, characterized in that: The frame housing (1) is provided with an airflow chamber (13) and an air extraction port (14) is provided. The air extraction port (14) is used to connect the airflow chamber (13) and the working chamber (12). At least two filter elements (2) are provided, and the filter elements (2) cover the air extraction port (14). The negative pressure fan (3) is provided on the frame housing (1). The air duct of the negative pressure fan (3) is connected to the airflow chamber (13). The negative pressure fan (3) is used to extract the gas in the airflow chamber (13) and the filter element (2).

3. The plastic powder recycling device for a plastic spraying machine according to claim 2, characterized in that: The powder cleaning structure (4) includes an air storage cylinder (41), a solenoid valve switch (42), an air supply pipe (43), and a controller (44). The air storage cylinder (41) stores compressed air. The first end of the air supply pipe (43) is connected to the air storage cylinder (41). The second end of the air supply pipe (43) passes through the air extraction port (14). The second end of the air supply pipe (43) is located inside the filter element (2). The solenoid valve switch (42) is located on the air supply pipe (43). The controller (44) is used to control the opening and closing of the solenoid valve switch (42). When the solenoid valve switch (42) is opened, the air supply pipe (43) sprays airflow into the filter element (2) to shake off the powder coating on the outer periphery of the filter element (2).

4. The plastic powder recycling device for a plastic spraying machine according to claim 1, characterized in that: The frame housing (1) has a collection port (15) for connecting the collection chamber (11) and the working chamber (12); the frame housing (1) has a collection drawer (16) for receiving powder coating that falls from the collection port (15) in the collection chamber (11).

5. The plastic powder recycling device for a plastic spraying machine according to claim 1, characterized in that: The filter element (2) includes a support mesh cylinder (21), a filter paper cylinder (22) and a base plate (23). The base plate (23) is disposed at the bottom of the filter element (2), and the support mesh cylinder (21) and the filter paper cylinder (22) are disposed on the base plate (23). The filter paper cylinder (22) is sleeved on the outer periphery of the support mesh cylinder (21), and the filter paper cylinder (22) is used to filter and intercept powder coatings in the air.

6. The plastic powder recycling device for a plastic spraying machine according to claim 5, characterized in that: The filter element (2) also includes a guide tube (24), which is disposed inside the support mesh cylinder (21) and is vertically disposed on the bottom plate (23); the bottom of the guide tube (24) has a number of air holes (241), which are arranged in a ring around the outer periphery of the guide tube (24).

7. The plastic powder recycling device for a plastic spraying machine according to claim 6, characterized in that: The outer periphery of the guide tube (24) is provided with a guide ring plate (25), which is located above the vent hole (241); along the vertical upward direction, the distance from the guide ring plate (25) to the guide tube (24) decreases.

8. The plastic powder recycling device for a plastic spraying machine according to claim 2, characterized in that: It also includes a sound-absorbing cotton board (17), which is disposed on the inner wall of the airflow chamber (13).

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