Anti-static-interference laboratory powder spraying equipment

Abstract

The utility model relates to laboratory powder spraying equipment capable of preventing static interference. The laboratory powder spraying equipment comprises a cabinet body and a small-dose powder outlet spray gun system, a powder feeding cavity, a middle cavity and a powder collecting cavity are formed in the cabinet body. Plastic plates are arranged on the top face, the left side face, the right side face and the bottom face of the powder feeding cavity. The small-dose powder discharge spray gun system comprises a fluidization cylinder, and the powder storage amount of the fluidization cylinder is 10-150 g. A powder outlet of the Venturi powder pump is connected with the spray gun; the powder adjusting mechanism is suitable for adjusting the concentration amount of the powder pumped out by the powder pumping pipe. According to the laboratory powder spraying equipment capable of preventing electrostatic interference, the plastic plate is arranged in the powder feeding cavity, so that electrostatic interference caused by electric conduction of metal plates on the periphery to electrostatic spraying is avoided, metal powder is close to spraying on a production line when a sample plate is sprayed in a laboratory, and the accurate powder spraying effect is achieved; and the quality inspection accuracy of a sample plate manufactured in a laboratory is ensured. On the premise of ensuring the accuracy, the equipment is very convenient to use and clean afterwards.

Description

Technical Field

[0001] This utility model relates to the field of powder coating, specifically to a laboratory powder coating device that is resistant to electrostatic interference. Background Technology

[0002] Metallic powder coatings are a major challenge in the powder coating industry. Unlike liquid metallic coatings, the metallic pigments in metallic powder coatings are not encapsulated and bonded together by the coating resin; instead, they exist independently. The metallic pigments used in metallic powder coatings are mainly aluminum powder and pearlescent powder. These pigments differ significantly from the base powder in terms of charge capacity, geometry, and compatibility. These differences lead to substantial variations in powder application rates between the metallic pigments and the base powder during electrostatic spraying, resulting in a series of quality problems, including significant color differences and difficulty in quality control.

[0003] Currently, the quality inspection methods for metallic powders mainly follow the conventional methods used for solid color powders. When spraying solid color powders, the color of the powder coating remains the same regardless of changes in the spraying process conditions. However, in metallic powders, there are differences in charge capacity and geometry between the metallic pigments and the base powder. During electrostatic spraying, these differences are greatly influenced by process parameters such as static electricity and airflow. Instability in these process parameters leads to varying powder application rates, resulting in inconsistent color differences.

[0004] The main reason for this is that few people in the industry realize that non-standard spraying processes inevitably lead to unreliable quality control. This is one of the reasons why metal powder coatings are not produced well.

[0005] The main problems with the quality inspection of metal powder are as follows:

[0006] First: Current powder spraying booths are all made of metal plates, especially the powder application chamber, whose inner walls are all made of conductive metal plates. During powder spraying, this will interfere with the static electricity of the spray gun, thus affecting the powder application ratio of metallic pigments.

[0007] Secondly, the current powder coating equipment uses the same spray gun system as the powder coating production line. This traditional system often results in excessive powder application. For example, in the lab, people are accustomed to using 100 or even 150 grams of powder to coat a sample that only requires 10 grams. Because existing spray guns produce a large amount of powder, it's difficult to control the amount. As a result, the powder application rate is less than 10%, which is significantly different from the 60% to 80% application rate on actual production lines. Previously, when metallic powder was rarely used, spraying excessive amounts of solid color powder didn't cause quality problems; it only resulted in more powder waste. However, when spraying metallic powder, large differences in the powder application rate during coating can lead to variations in the metallic pigment application rate, directly causing significant color differences.

[0008] Third: For convenience, most people spray powder in the laboratory do not fluidize the powder before spraying as they would on a production line, which increases the difference in powder coating effect compared to the production line. Some have adopted designs that supply powder from the spray gun, and even prepared suspended fluidizing cups to solve the powder fluidization problem, but firstly, the effect cannot reach the effect of fluidizing equipment on the production line, and secondly, the operation and cleaning afterward are very cumbersome, so few people use them. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a laboratory powder spraying device that is resistant to electrostatic interference. This solves the technical problems of electrostatic interference when applying powder to experimental samples and the difficulty in controlling the amount of powder output when applying small doses of powder, which affects the quality inspection of metal powder.

[0010] The technical solution adopted by this utility model to solve its technical problem is:

[0011] A laboratory powder spraying device with anti-static interference is provided, including...

[0012] Cabinet and small-dose powder spray gun system;

[0013] The cabinet has a powder loading chamber, a middle chamber, and a powder collection chamber. The top, left and right sides, and bottom of the powder loading chamber are all covered with plastic panels.

[0014] The low-dose powder spray gun system includes

[0015] Fluidizing cylinder, the lower end of which is inserted into the middle cavity from the bottom of the upper powder chamber, and its upper end is attached to the bottom of the upper powder chamber. The powder storage capacity of the fluidizing cylinder is 10-150g.

[0016] A venturi powder pump, wherein the suction port of the venturi powder pump is connected to an exhaust pipe, the lower end of the exhaust pipe is adapted to be inserted into a fluidizing cylinder, and the discharge port of the venturi powder pump is connected to a spray gun.

[0017] A powder adjustment mechanism is provided on the powder extraction tube and is adapted to adjust the concentration of powder extracted by the powder extraction tube.

[0018] Furthermore, the central cavity is not connected to the powder loading cavity, and a first drawer is provided inside the central cavity, in which an electrostatic generator is placed.

[0019] Furthermore, the powder collection chamber is connected to the powder loading chamber, and a second drawer is provided inside the powder collection chamber, which is suitable for collecting fallen powder.

[0020] Furthermore, the powder adjusting mechanism includes

[0021] Multiple air inlet holes are distributed vertically on the powder extraction tube.

[0022] A sleeve is fitted onto a powder extraction tube, and the sleeve is movable on the powder extraction tube and adapted to block the air inlet.

[0023] Furthermore, the sleeve moves up and down on the powder extraction tube to block each air inlet hole.

[0024] Furthermore, a U-shaped groove is formed on the sleeve, with the opening of the U-shaped groove located at the upper or lower end of the sleeve. The sleeve rotates on the powder extraction tube, thereby blocking each air inlet hole and adjusting the air intake of the powder extraction tube from each air inlet hole.

[0025] Furthermore, the fluidizing cylinder includes

[0026] The cylinder has a radially outwardly protruding hanging edge at its upper end, and the cylinder fits into the bottom surface of the powder chamber via the hanging edge;

[0027] Fluidizing plate, which is located at the bottom of the cylinder;

[0028] The fluidizing gas inlet is located on the lower side wall of the cylinder.

[0029] Furthermore, the diameter of the cylinder is 5-8 cm and the height of the cylinder is 20-30 cm.

[0030] Furthermore, the diameter of the powder extraction tube is 6-10 mm.

[0031] Furthermore, the diameter of the jet needle of the Venturi powder pump is 0.6-0.8 mm.

[0032] The beneficial effects of this utility model are:

[0033] This utility model relates to an anti-static interference laboratory powder coating device. By placing a plastic plate inside the powder coating chamber, it avoids the electrostatic interference caused by the conductivity of the surrounding metal plates during electrostatic spraying. This makes the metal powder spraying of laboratory samples similar to that on the production line, achieving accurate powder coating results and ensuring the accuracy of quality inspection of laboratory-made samples. In addition to ensuring accuracy, the device is also very convenient to use and clean afterward.

[0034] By using a small-dose powder spray gun system, replacing it with a venturi powder pump with a small powder output, and configuring a small fluidizing cylinder specifically for laboratory sample spraying, it is possible to achieve powder spraying with a small powder output, thus meeting the needs of laboratory sample spraying for small-dose powder spraying.

[0035] Small fluidizing drums can fluidize small amounts of powder, best simulating the powder coating process. In fact, the coating effect with a fluidizing drum is much better than that without one.

[0036] The movement of the sleeve on the powder extraction tube can control the number of air inlet holes blocked, thereby controlling the air intake of the powder extraction tube and the powder concentration of the powder extraction tube. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] Figure 1 This is a simplified side view of the laboratory powder spraying equipment for anti-static interference according to this utility model;

[0039] Figure 2 This is an isometric view of a laboratory powder spraying equipment designed to resist electrostatic interference.

[0040] Figure 3 This is a schematic diagram of a small-dose powder spray gun system;

[0041] Figure 4 This is a schematic diagram of the first type of powder adjustment mechanism;

[0042] Figure 5 This is a schematic diagram of the second type of powder adjustment mechanism;

[0043] Among them, 1. cabinet, 11. powder inlet chamber, 12. middle chamber, 13. powder collection chamber, 14. filter element, 15. fan, 16. air tank;

[0044] 2. Fluidizing cylinder; 21. Hanging edge; 22. Fluidizing plate;

[0045] 3. Venturi powder pump; 31. Air jet needle;

[0046] 4. Powder extraction pipe; 41. Air inlet hole; 42. Sleeve; 421. U-shaped groove;

[0047] 5. Spray gun;

[0048] 61. First drawer; 62. Second drawer;

[0049] 7. Plastic sheet. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0051] This application provides a laboratory powder spraying device with anti-static interference, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0052] To address the technical problems in existing technologies where electrostatic interference during powder coating of experimental samples and the difficulty in controlling powder output when applying small doses of powder, thus affecting the quality inspection of metal powder, an embodiment of this application provides a laboratory powder coating device resistant to electrostatic interference. This is described in detail below.

[0053] like Figure 1 and Figure 2 As shown, a laboratory powder spraying device with anti-static interference includes...

[0054] Cabinet 1 and small-dose powder spray gun system;

[0055] The cabinet 1 has a powder loading chamber 11, a middle chamber 12 and a powder collection chamber 13. The top, left and right sides and the bottom of the powder loading chamber 11 are all provided with plastic plates 7.

[0056] The low-dose powder spray gun system includes

[0057] Fluidizing cylinder 2, the lower end of which is inserted into the middle cavity 12 from the bottom surface of the upper powder cavity 11, and its upper end is connected to the bottom surface of the upper powder cavity 11. The powder storage capacity of the fluidizing cylinder 2 is 10-150g.

[0058] Venturi powder pump 3, the suction port of the Venturi powder pump 3 is connected to the exhaust pipe, the lower end of the exhaust pipe is adapted to be inserted into the fluidizing cylinder 2, and the discharge port of the Venturi powder pump 3 is connected to the spray gun 5.

[0059] A powder adjustment mechanism is provided on the powder extraction tube 4 and is adapted to adjust the amount of powder extracted by the powder extraction tube 4.

[0060] The plastic plate 7 can be fixed by means of adhesive, clips, etc.

[0061] Specifically, as an optional implementation method in this embodiment, such as Figure 1 and Figure 2 As shown, the central cavity 12 is not connected to the powder loading cavity 11. A first drawer 61 is provided inside the central cavity 12, and the first drawer 61 houses the electrostatic generator and other electrical components. The electrostatic generator is located inside the central cavity 12 via the first drawer 61, which facilitates the debugging and maintenance of the electrostatic generator.

[0062] Specifically, as an optional implementation method in this embodiment, such as Figure 1 and Figure 2 As shown, the powder collection chamber 13 is connected to the powder loading chamber 11. A second drawer 62 is provided in the powder collection chamber 13. The second drawer 62 is suitable for collecting powder that falls off the filter element 14.

[0063] See Figure 1 There is a space between the rear side of the powder filling chamber 11 and the rear side of the cabinet 1. The lower end of the filter element 14 extends into this area, and the back-blown powder directly enters the second drawer 62.

[0064] The powder loading chamber 11 is a negative pressure chamber. A filter element 14 is installed on the rear side of the powder loading chamber 11. The filter element 14 is connected to an external fan 15. When the fan 15 is working, the powder loading chamber 11 is in a negative pressure state, so that the powder sprayed by the spray gun 5 can move from front to back in the powder loading chamber 11. Secondly, an air tank 16 is installed on the top of the cabinet 1. The air tank 16 is used to backflush the filter element 14. The powder on the filter element 14 is blown off by backflush. The backflush technology of the filter element 14, the fan 15 and the air tank 16 are all existing technologies, and the applicant will not elaborate on them again. The key point of this embodiment is to add plastic plates 7 on the top, side and bottom surfaces of the powder loading chamber 11 to prevent the metal powder in the powder loading chamber 11 from being affected by the static electricity of the metal plates.

[0065] The electrostatic generator is used to provide static electricity to the spray gun needle, and the gas tank 16 provides the total gas. After the total gas passes through a gas distribution device, it is divided into main gas and auxiliary gas as needed. Both the main gas and the auxiliary gas are connected to the Venturi powder pump 3.

[0066] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, the powder adjusting mechanism includes

[0067] Multiple air inlet holes 41 are distributed vertically on the powder extraction pipe 4.

[0068] A sleeve 42 is fitted onto the powder extraction tube 4. The sleeve 42 moves on the powder extraction tube 4 and is adapted to block the air supply hole 41.

[0069] Specifically, there are three air inlet holes 41, the powder extraction tube 4 is a plastic tube, and the sleeve 42 is also a plastic tube. The sleeve 42 is interference-fitted onto the powder extraction tube 4.

[0070] As an optional implementation of the powder adjustment mechanism in this embodiment, such as Figure 4 As shown, the sleeve 42 moves up and down on the powder extraction tube to block each air inlet hole.

[0071] By moving the sleeve 42 up and down, the number of times the sleeve 42 blocks the air inlet 41 is controlled, thereby controlling the air intake of the powder extraction tube 4. The more air enters the powder extraction tube 4, the more sparse the extracted metal powder will be; the less air enters the powder extraction tube 4, the more concentrated the extracted metal powder will be.

[0072] As another optional implementation of the powder adjusting mechanism in this embodiment, such as Figure 5 As shown, a U-shaped groove 421 is formed on the sleeve 42. The opening of the U-shaped groove 421 is located at the upper or lower end of the sleeve 42. The sleeve 42 rotates on the powder extraction tube, thereby blocking each air inlet hole and adjusting the air intake of the powder extraction tube from each air inlet hole. Figure 5 As shown, at this time, the three air inlets 31 are not blocked, and the air intake of the powder extraction pipe 3 is at its maximum.

[0073] A normal Venturi pump directly draws the fluidized powder from the fluidizing tank, making it impossible to control the powder concentration. To reduce the powder concentration, the Venturi powder pump 3 in this embodiment has an air inlet 41 and an additional sleeve 42 on its powder extraction pipe 4. The size of the air inlet can be adjusted by moving the sleeve up and down to regulate the amount of gas added.

[0074] In this embodiment, the powder adjustment mechanism can also directly use an existing mini regulating valve, which is directly connected to the powder extraction pipe 43, and the air intake of the powder extraction pipe 43 is directly controlled by the mini regulating valve.

[0075] Compared to the aforementioned sleeve 42, the mini regulating valve has the disadvantage that it occupies the radial space of the powder extraction pipe 4, thus affecting the entry and exit of the powder extraction pipe 4 into the fluidizing cylinder 2.

[0076] Specifically, as an optional implementation method in this embodiment, such as Figure 3 and Figure 4 As shown, the fluidizing cylinder 2 includes

[0077] The cylinder has a radially outwardly protruding hanging edge 21 at its upper end, and the cylinder is fitted with the bottom surface of the powder chamber 11 via the hanging edge 21.

[0078] Fluidizing plate 22 is disposed at the bottom of the cylinder;

[0079] The fluidizing gas inlet is located on the lower side wall of the cylinder.

[0080] The fluidizing gas inlet is connected to the gas tank 16. Gas is introduced into the cylinder from the fluidizing gas inlet. After the gas passes through the fluidizing plate 22, the metal powder in the cylinder begins to fluidize.

[0081] The fluidizing cylinder 2, thanks to the structure of the hanging edge 21, allows for easy addition of powder to a smaller fluidizing cylinder. It also facilitates direct purging after use.

[0082] As an optional implementation method in this embodiment, the diameter of the cylinder is 5-8cm and the height of the cylinder is 20-30cm.

[0083] As an optional implementation in this embodiment, the diameter of the powder extraction tube 4 is 6-10 mm. Previously, the diameter of the powder extraction tube 43 was about 20-22 mm. Now, the diameter has been reduced by more than half, and the area of ​​the extraction tube has been reduced by several times, making it suitable for small-dose powder output.

[0084] Specifically, the diameter of the jet needle 31 of the Venturi powder pump 3 is 0.6-0.8 mm. The common jet needle 31 diameter is 1.0-1.4 mm, and now the diameter of the jet needle 31 is reduced.

[0085] The blower 15 draws through the suction filter 14 to the rear of the powder loading chamber 11, thereby creating a negative pressure inside the powder loading chamber 11. The operator stands at the front of the powder loading chamber 11 and holds the spray gun 5 to spray metal powder onto the experimental sample inside the powder loading chamber 11. Relying on the four plastic plates 7 inside the powder loading chamber 11, the static electricity on the metal plate of the cabinet 1 is prevented from affecting the metal powder inside the powder loading chamber 11. The entire front of the powder loading chamber 11 can be guaranteed to be free of static electricity, so that the metal powder can be evenly distributed inside the powder loading chamber 11, ensuring the powder loading ratio of metal powder.

[0086] At the same time, the powder output of the spray gun 5 in the laboratory powder spraying equipment was also controlled, which can carry out small-dose powder spraying. The fluidizing cylinder 2 and Venturi powder pump 3 of the small-dose powder spraying gun system were optimized in size. In particular, the fluidizing cylinder 2, as a small cylinder, can be directly hung on the bottom surface of the powder chamber 11, which changes the traditional large barrel structure. The small fluidizing cylinder 2 is suitable for small-dose powder fluidization.

[0087] To achieve intelligent operation, this embodiment can also add a sensor control function to the fan 15, and install a device for controlling the power supply of the fan 15 by human body sensing, which will automatically stop the operation of the fan 15 when not in use, thereby reducing noise and saving energy.

[0088] A purge shield door is provided on the front side of the powder chamber 11. The shield door adopts a hinge structure or other installation structure so that the shield door can rotate and open and close normally. When the powder chamber 11 is purged, the shield door can be closed to prevent powder from overflowing.

[0089] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0090] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0091] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0093] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0094] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0095] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A laboratory powder spraying device resistant to electrostatic interference, characterized in that, include Cabinet (1) and small-dose powder spray gun system; The cabinet (1) has a powder loading chamber (11), a middle chamber (12) and a powder collection chamber (13). The top, left and right sides and bottom of the powder loading chamber (11) are all provided with plastic plates (7). The low-dose powder spray gun system includes Fluidizing cylinder (2), the lower end of the fluidizing cylinder (2) is inserted into the middle cavity (12) from the bottom surface of the upper powder cavity (11), and its upper end is connected to the bottom surface of the upper powder cavity (11). The amount of powder stored in the fluidizing cylinder (2) is 10-150g. Venturi powder pump (3), the suction port of the Venturi powder pump (3) is connected to the exhaust pipe, the lower end of the exhaust pipe is adapted to be inserted into the fluidizing cylinder (2), and the powder outlet of the Venturi powder pump (3) is connected to the spray gun (5). A powder adjustment mechanism is provided on the powder extraction tube (4) and is adapted to adjust the amount of powder extracted by the powder extraction tube (4).

2. The laboratory powder spraying equipment for resisting electrostatic interference according to claim 1, characterized in that, The middle cavity (12) is not connected to the powder filling cavity (11). A first drawer (61) is provided in the middle cavity (12), and an electrostatic generator is placed in the first drawer (61).

3. The anti-static interference laboratory powder spraying equipment according to claim 1, characterized in that, The powder collection chamber (13) is connected to the powder loading chamber (11), and a second drawer (62) is provided in the powder collection chamber (13). The second drawer (62) is suitable for collecting the fallen powder.

4. The laboratory powder spraying equipment for resisting electrostatic interference according to claim 1, characterized in that, The powder adjusting mechanism includes Multiple air inlet holes (41) are arranged vertically on the powder extraction tube (4); A sleeve (42) is fitted onto a powder extraction tube (4). The sleeve (42) moves on the powder extraction tube (4) and is adapted to block the air inlet (41).

5. The anti-static interference laboratory powder spraying equipment according to claim 4, characterized in that, The sleeve (42) moves up and down on the powder extraction tube (4) to block each air inlet (41).

6. The anti-static interference laboratory powder spraying equipment according to claim 4, characterized in that, A U-shaped groove (421) is provided on the sleeve (42). The opening of the U-shaped groove (421) is located at the upper or lower end of the sleeve (42). The sleeve (42) rotates on the powder extraction tube (4) to block each air inlet (41) and adjust the air intake of the powder extraction tube (4) from each air inlet (41).

7. The anti-static interference laboratory powder spraying equipment according to claim 1, characterized in that, The fluidizing cylinder (2) includes The cylinder has a radially outwardly protruding hanging edge (21) at its upper end, and the cylinder is fitted with the bottom surface of the powder chamber (11) via the hanging edge (21); Fluidizing plate (22) is located at the bottom of the cylinder; The fluidizing gas inlet is located on the lower side wall of the cylinder.

8. The anti-static interference laboratory powder spraying equipment according to claim 7, characterized in that, The diameter of the cylinder is 5-8 cm and the height is 20-30 cm.

9. The laboratory powder spraying equipment for resisting electrostatic interference according to claim 1, characterized in that, The diameter of the powder extraction tube (4) is 6-10 mm.

10. The anti-static interference laboratory powder spraying equipment according to claim 1, characterized in that, The diameter of the jet needle (31) of the Venturi powder pump (3) is 0.6-0.8 mm.

Images