A uniform mixing device for epoxy powder coating processing

Abstract

The present invention relates to the technical field related to coating mixing, and discloses a uniform mixing device for epoxy powder coating processing. In order to solve the problem of excessive residue when the mixing tank pours out the coating, a stirring rod that moves radially along the lower pressing cylinder is installed on the lower pressing cylinder. The stirring rod is thrown out by the rotation of the lower pressing cylinder, and the mixing and stirring of the coating are realized. When the mixed coating needs to be poured out, the stirring rod is successively pressed by the outer pressing seat and the inner pressing seat, so that the inner and outer sides of the lower pressing cylinder are successively scraped. During this process, when the stirring rod moves radially along the lower pressing cylinder, the coating adhered to itself can be scraped off, and finally a comprehensive cleaning effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to coating mixing, and particularly to a uniform mixing device for epoxy powder coating processing. Background Art

[0002] Epoxy powder coating is a thermosetting powder coating with excellent performance, and is widely favored for its excellent corrosion resistance and toughness. It consists of a variety of key components, including high-quality epoxy resin as the base material, carefully selected pigments and fillers to endow the coating with the required color and covering power, and various additives such as leveling agents and antistatic agents to improve the processing performance of the coating and the performance of the final coating film. In addition, the curing agent is an indispensable part, which reacts chemically with the epoxy resin under heating conditions to cure the coating and form a hard paint film.

[0003] Currently, the mixing and preparation process of epoxy powder coating mainly relies on the key equipment of the mixing tank. However, in actual operation, when the mixed coating is poured out of the mixing tank, a large amount of coating often remains inside the tank body and on the stirring rod. These sticky coatings not only cause waste of raw materials, but also may affect the purity and performance consistency of the subsequent batches of coatings. If the mixing tank is directly cleaned to remove these residues, it will not only consume a large amount of time and manpower, but also result in higher cost losses due to the washed-off coatings. Summary of the Invention

[0004] The present invention provides a uniform mixing device for epoxy powder coating processing, which has the advantage of comprehensive cleaning to solve the problem of excessive residue when the coating is poured out of the mixing tank as mentioned in the above background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A uniform mixing device for epoxy powder coating processing, comprising: a mixing tank, with a feed pipe fixed on the side, a bottom plug installed at the bottom, a driving gear and a driven gear meshed externally at the top, and the driving gear is driven by a motor; a support rod, movably installed on the driven gear, with a pressing cylinder fixed at the bottom end of the support rod, and a stirring rod movably installed outside the pressing cylinder; a pressure rod seat, movably installed on the top of the mixing tank, and a return spring is connected between the pressure rod seat and the top of the mixing tank. A magnetic block is fixedly installed on the bottom surface of the pressure rod seat, and a coil is fixedly installed on the top of the mixing tank below the magnetic block. An inner pressure pull rod and an outer pressure pull rod are fixedly installed at the bottom of the pressure rod seat. An inner pressure seat is installed on the inner pressure pull rod, and an outer pressure seat is installed on the outer pressure pull rod.

[0006] Further, the shape of the pressing cylinder is a cylinder with a through middle part.

[0007] Further, the inner pressure seat is located inside the pressing cylinder, the outer pressure seat is located between the outer side of the pressing cylinder and the inner side of the mixing tank, and the cross-sectional shapes of both the inner pressure seat and the outer pressure seat are isosceles trapezoids.

[0008] Furthermore, an internal pressure support rod is movably installed at the top of the internal pressure seat, and an internal pressure spring is connected between the internal pressure support rod and the internal pressure pull rod. An external pressure spring is fixedly installed between the top of the external pressure seat and the external pressure pull rod.

[0009] Furthermore, a stop switch is fixedly installed at the bottom of the external pressure pull rod, a limit ejector rod located inside the external pressure spring is fixedly installed at the top of the external pressure seat, and a control computer is fixed on the outside of the mixing tank.

[0010] Furthermore, an upper pressure cylinder located above the lower pressure cylinder is movably installed on the outside of the support rod, and a stirring rod is movably installed on the upper pressure cylinder. A switching slider is movably installed on the outside of the mixing tank, and a screw handle is threadedly connected to the switching slider, and the end of the screw handle is installed on the outside of the mixing tank.

[0011] Furthermore, a rectangular groove is opened at the port of the switching slider, a position switch is fixedly installed in the rectangular groove, and a rib is arranged in the middle of the outside of the external pressure seat.

[0012] Furthermore, a re-pressing switch located above the pressure rod seat is fixedly installed on the mixing tank.

[0013] Furthermore, a limit bolt is arranged at the top of the support rod, and a vibration ejector spring is connected between the limit bolt and the top of the driven gear.

[0014] Furthermore, a limit ring is fixed on the outside of the support rod.

[0015] The present invention has the following beneficial effects:

[0016] A uniform mixing device for epoxy powder coating processing provided by the present invention, when the lower pressure cylinder rotates driven by a driving device, the stirring rod on it will be thrown out due to the centrifugal force, so as to mix and stir the epoxy powder coating in all directions in three-dimensional space. This stirring method not only ensures the uniformity of the coating, but also greatly improves the mixing efficiency.

[0017] When the mixing process is completed and the coating needs to be poured out, the external pressure external pressure seat and the internal pressure internal pressure seat are used to press the stirring rod in sequence. This step is crucial because it not only makes the stirring rod move radially along the lower pressure cylinder, but more importantly, during this process, the outer surface of the stirring rod will be in close contact with the inner wall of the lower pressure cylinder, so as to scrape and take away the coating adhered to the stirring rod. At the same time, the further action of the internal pressure seat also ensures that the inside of the lower pressure cylinder can be effectively scraped, avoiding the residue of the coating.

[0018] The ingenious design of this cleaning mechanism lies in its utilization of the natural characteristics of the stirring rod during radial movement, achieving dual cleaning of the stirring rod and the pressing cylinder. This process is not only efficient but also comprehensive, ensuring that the device can return to its initial state after each use, providing a clean and pollution-free environment for the next mixing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of the specification depict the embodiments disclosed by the present invention and, together with the specification, are used to explain the principles disclosed by the present invention.

[0020] Referring to the drawings, the present invention can be more clearly understood from the following detailed description, wherein:

[0021] Figure 1 is a schematic external three-dimensional structure diagram of the whole of the present invention;

[0022] Figure 2 is a schematic internal three-dimensional structure diagram of the whole of the present invention;

[0023] Figure 3 is a schematic internal planar sectional structure diagram of the whole of the present invention;

[0024] Figure 4 is Figure 3 an enlarged structure diagram at position E in

[0025] Figure 5 is Figure 3 an enlarged structure diagram at position F in

[0026] Figure 6 is Figure 3 an enlarged structure diagram at position G in

[0027] Figure 7 is a schematic diagram of the positions and structures of the components on the pressure rod seat of the present invention;

[0028] Figure 8 is a schematic three-dimensional structure diagram of the pressing cylinder of the present invention;

[0029] Figure 9 is a schematic three-dimensional structure diagram of the switching slider of the present invention.

[0030] In the figure: 1, mixing tank; 2, control computer; 3, feed pipe; 4, bottom plug; 5, switching slider; 6, screw handle; 7, driving gear; 8, driven gear; 9, support rod; 900, limit ring; 10, vibration top spring; 11, inner pressure seat; 12, inner pressure support rod; 13, inner pressure spring; 14, inner pressure pull rod; 15, pressure rod seat; 151, return spring; 16, re-pressing switch; 17, magnet; 18, outer pressure pull rod; 19, outer pressure spring; 20, stop switch; 21, outer pressure seat; 211, limit ejector rod; 22, lower pressing cylinder; 221, upper pressing cylinder; 23, stirring rod; 24, in-place switch; 25, motor; 26, coil. Detailed implementation

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] A uniform mixing device for epoxy powder coating processing provided by the present invention aims to solve the problem of excessive coating residue when the coating in the mixing tank 1 is poured out. Please refer to Figure 1 and Figure 2 It can be seen that the mixing tank 1 can be stably placed at the required position through the bracket. There is a cavity inside the mixing tank 1, and the coating is input through the feed pipe 3 fixed on the side, so that the epoxy powder coating to be mixed is input into the inner cavity of the mixing tank 1. After the stirring mechanism in the mixing tank 1 stirs the epoxy powder coating, the bottom plug 4 movably installed at the bottom of the mixing tank 1 is taken out, so that the stirred epoxy powder coating in the mixing tank 1 is poured out.

[0033] Regarding the stirring mechanism, specifically, refer to Figure 2 、 Figure 3 and Figure 8 It can be seen that a driven gear 8 is movably installed at the top of the mixing tank 1, and a driving gear 7 driven by a motor 25 is movably installed at the top of the mixing tank 1. The driving gear 7 and the driven gear 8 are externally meshed. When the motor 25 drives the driving gear 7 to rotate, the driven gear 8 can be driven to rotate synchronously, thereby providing sufficient power for subsequent stirring of the powder coating. Three support rods 9 distributed at equal angles in a ring are installed on the driven gear 8, and the lower pressing cylinder 22 is fixedly installed at the bottom end of the support rod 9. And, as Figure 3 and Figure 8As shown in the figure, the shape of the lower pressing cylinder 22 is a hollow cylinder, and a plurality of stirring rods 23 are movably installed on the outer side. It should be noted that both ends of the stirring rod 23 are provided with cylinders having a diameter slightly larger than the diameter of the middle part thereof, and corresponding cylindrical grooves are provided on both the inner and outer sides of the lower pressing cylinder 22. This method not only restricts the stirring rod 23 to only perform radial reciprocating motion along the lower pressing cylinder 22, but also prevents the stirring rod 23 from detaching from the lower pressing cylinder 22 through the restriction of the end cylinders. Based on the above, when the driven gear 8 drives the lower pressing cylinder 22 to rotate through the support rod 9, the stirring rod 23 can be rotated synchronously. The stirring rod 23 moves outward under the action of centrifugal force until its end abuts against the inner side of the lower pressing cylinder 22. At this time, the stirring rod 23 that extends is used to complete the stirring work of the epoxy powder coating in the mixing tank 1.

[0034] After the stirring is completed, the epoxy powder coating in the mixing tank 1 is poured out by opening the bottom plug 4. In order to reduce the coating adhered to the inner wall of the mixing tank 1, the inner and outer sides of the lower pressing cylinder 22, and the stirring rod 23, combined with Figures 3 - 7 It can be seen that a pressure rod seat 15 that moves up and down reciprocally along its axis is movably installed at the top of the mixing tank 1. A return spring 151 is connected between the pressure rod seat 15 and the top of the mixing tank 1. Under the pushing force of the elastic force of the return spring 151, the pressure rod seat 15 always has a tendency to move upward, that is, to provide the driving force for the upward movement of the pressure rod seat 15. A magnetic block 17 is fixedly installed on the bottom surface of the pressure rod seat 15. Correspondingly, a coil 26 located below the magnetic block 17 is fixedly installed at the top of the mixing tank 1. When the coil 26 is energized, it can generate magnetism that attracts the magnetic block 17, realizing the downward movement of the pressure rod seat 15 and compressing the return spring 151.

[0035] More importantly, from Figure 7 It can be seen that an inner pressure pull rod 14 and an outer pressure pull rod 18 are fixedly installed at the bottom of the pressure rod seat 15. Correspondingly, an inner pressure seat 11 is installed on the inner pressure pull rod 14, and the inner pressure seat 11 is located inside the lower pressing cylinder 22. The outer side of the inner pressure seat 11 is slidably connected to the inner side of the lower pressing cylinder 22. When the inner pressure seat 11 moves along the axis of the lower pressing cylinder 22, it can scrape the inner side part of the lower pressing cylinder 22; similarly, an outer pressure seat 21 located between the outer side part of the lower pressing cylinder 22 and the inner side part of the mixing tank 1 is installed on the outer pressure pull rod 18. When the outer pressure seat 21 moves up and down, it uses itself to scrape the inner wall of the mixing tank 1 and the outer side part of the lower pressing cylinder 22, thereby reducing the raw materials adhered to this part. Not only that, referring to Figure 3It can be clearly seen that the inner pressure seat 11 is an approximate cylinder with an isosceles trapezoid cross-section, and the outer pressure seat 21 is also an approximate ring with an isosceles trapezoid cross-section. The advantage of this arrangement is that when the coil 26 is energized and generates magnetism that attracts the magnet 17, due to the height difference between the inner pressure seat 11 and the outer pressure seat 21, the outer pressure seat 21 will come into contact with the lower pressing cylinder 22 first. When the motor 25 stops working, the outer pressure seat 21 presses down, so that the paint adhering to the inner wall of the mixing tank 1 and the outer wall of the lower pressing cylinder 22 is scraped off. When the bottom inclined surface of the outer pressure seat 21 abuts against the stirring rod 23, the stirring rod 23 will move radially along the lower pressing cylinder 22, and during the movement, the outer side of the stirring rod 23 is scraped by the lower pressing cylinder 22. As the outer pressure seat 21 continues to move downward, the area between the lower pressing cylinder 22 and the inner side of the mixing tank 1 is scraped off; when the inner pressure seat 11 also moves downward synchronously, the inner pressure seat 11 will push the stirring rod 23 radially outward along the lower pressing cylinder 22. When the inner pressure seat 11 passes through the inner side of the lower pressing cylinder 22, the paint adhering to the inner wall of the lower pressing cylinder 22 can be scraped out. It can be seen that by scraping the mixing tank 1 and the lower pressing cylinder 22 successively with the outer pressure seat 21 and the inner pressure seat 11, the powder paint adhering to the inner and outer sides of the lower pressing cylinder 22, the outer side of the stirring rod 23, and the inner wall of the mixing tank 1 can be greatly reduced.

[0036] On this basis, in order to avoid the problem of jamming caused by rigid contact between the outer pressure seat 21 / inner pressure seat 11 and the stirring rod 23, combined with Figures 3 - 5 and Figure 7 it can be seen that there is an inner pressure support rod 12 movably installed on the top of the inner pressure seat 11 through a bearing, and an inner pressure spring 13 is connected between the inner pressure support rod 12 and the inner pressure pull rod 14; an outer pressure spring 19 is fixedly installed between the top of the outer pressure seat 21 and the outer pressure pull rod 18. Specifically, the top of the outer pressure spring 19 is fixed to the bottom end of the outer pressure pull rod 18, and the bottom is fixed to the top of the outer pressure seat 21. Through the elastic connection between the inner pressure seat 11 and the inner pressure pull rod 14, and the outer pressure seat 21 and the outer pressure pull rod 18, it is ensured that during the downward movement of the inner pressure seat 11 and the outer pressure seat 21, the problem of movement jamming caused by rigid direct contact will not occur. Moreover, combined with Figure 3 、 Figure 5 and Figure 7It can be seen that a stop switch 20 is fixedly installed at the bottom of the external pressure pull rod 18. Correspondingly, a limit ejector rod 211 located inside the external pressure spring 19 is fixedly installed at the top of the external pressure seat 21. On the one hand, the limit ejector rod 211 can restrict the movement of the external pressure spring 19. On the other hand, when the stop switch 20 on the external pressure pull rod 18 presses the limit ejector rod 211, it indicates that the external pressure seat 21 has moved to the bottom. The stop switch 20 transmits its signal to the control computer 2 fixedly installed outside the mixing tank 1, and the coil 26 stops working through the control computer 2. Therefore, it can be seen that when the external pressure seat 21 moves downward and abuts against the lower part of the mixing tank 1, by squeezing the stop switch 20, it automatically cuts off the power after reaching the downward limit, and the pressure rod seat 15 moves upward and returns to its original position under the elastic force of the return spring 151.

[0037] Furthermore, in order to enable the powder coating in the mixing tank 1 to flow up and down during the stirring process, so as to achieve a more uniform material mixing, combined with Figure 3 and Figure 8 It can be seen that an upper pressure cylinder 221 is movably installed outside the support rod 9 above the lower pressure cylinder 22, and a plurality of stirring rods 23 are also movably arranged on the upper pressure cylinder 221. Moreover, combined with Figure 3 and Figure 6 It can be seen that a switching slider 5 is movably installed outside the mixing tank 1, and a screw handle 6 is threadedly connected to the switching slider 5. The end of the screw handle 6 is installed outside the mixing tank 1. When the screw handle 6 is manually rotated, the switching slider 5 can reciprocate along the radial direction of the mixing tank 1. A rectangular groove is opened at the port of the switching slider 5, and a position switch 24 is fixedly installed in the groove. Correspondingly, a convex strip is provided in the middle of the outside of the external pressure seat 21. When the external pressure seat 21 moves upward to the upper limit inside the mixing tank 1, it will be blocked by the inner part of the mixing tank 1 and the external pressure seat 21 cannot continue to move upward. At this time, by turning the screw handle 6, the switching slider 5 will abut against the outside of the external pressure seat 21, and the position switch 24 on the switching slider 5 will abut against the convex strip provided on the outside of the external pressure seat 21. Since the position switch 24 is placed in the groove, only when the switching slider 5 abuts against the outside of the external pressure seat 21 can the position switch 24 be squeezed. And the signal of the squeezed position switch 24 is transmitted to the control computer 2, and the re-pressure switch 16 fixed on the mixing tank 1 starts to work through the control computer 2. From Figure 1It can be seen that the double-pressure switch 16 is located above the pressure rod base 15. When the pressure rod base 15 moves upward to the top, it will squeeze the double-pressure switch 16. When the double-pressure switch 16 starts to work, the compressed double-pressure switch 16 will cause the coil 26 to start working until the stop switch 20 is compressed, thereby providing a signal to cut off the power supply of the coil 26. From this, it can be seen that when the in-place switch 24 is compressed, it can cause the double-pressure switch 16 to start working. By compressing the double-pressure switch 16, the coil 26 is forced to be energized, and after the stop switch 20 is compressed, the coil 26 can be cut off from the power supply again. Repeating this way can ensure that the pressure rod base 15 reciprocates up and down along the top of the mixing tank 1.

[0038] More prominently, referring to Figure 8 It can be seen that the top of the support rod 9 is movably installed on the driven gear 8, and a limit bolt is provided at the top of the support rod 9. A vibration top spring 10 is connected between the limit bolt and the top of the driven gear 8. Under the elastic force of the vibration top spring 10, the support rod 9 has a tendency to pull the lower pressing cylinder 22 upward. It should be noted that the elastic force of the vibration top spring 10 can only achieve the upward movement of the lower pressing cylinder 22. If the upper pressing cylinder 221 presses on the lower pressing cylinder 22, the weight of the upper pressing cylinder 221 and the lower pressing cylinder 22 is greater than the elastic force of the vibration top spring 10, so that the lower pressing cylinder 22 pulls the support rod 9 downward and simultaneously squeezes the vibration top spring 10.

[0039] Specifically, the main working mode of this application is as follows: Under normal conditions, under the elastic force of the return spring 151, the pressure rod base 15 moves upward until it squeezes the double-pressure switch 16. At this time, by turning the screw handle 6, the switching slider 5 moves relatively away from the outer pressure seat 21. At the same time, when the pressure rod base 15 moves upward to the top limit, the outer pressure pull rod 18 and the inner pressure pull rod 14 move to the upward limit at the same time. There is a tendency for the outer pressure spring 19 to pull the outer pressure seat 21 upward until the outer pressure seat 21 moves upward to the limit; similarly, the inner pressure spring 13 pulls the inner pressure seat 11 upward to the limit through the inner pressure support rod 12. And the inner pressure seat 11 is relatively located above the outer pressure seat 21. The upper pressing cylinder 221 presses the lower pressing cylinder 22 under its own gravity, and the lower pressing cylinder 22 pulls the support rod 9 downward and compresses the vibration top spring 10.

[0040] The bottom of the mixing tank 1 is sealed by the bottom plug 4, and the epoxy powder coating is input into the interior of the mixing tank 1 through the feed pipe 3. The control computer 2 controls the motor 25 to rotate, so that the driving gear 7 drives the driven gear 8 to rotate synchronously. The driven gear 8 realizes the synchronous rotation of the lower pressing cylinder 22 and the upper pressing cylinder 221 according to the support rod 9. The stirring rod 23 is thrown outwards under the action of centrifugal force until the stirring rod 23 abuts against the inner side of the upper pressing cylinder 221 / the lower pressing cylinder 22, and the powder coating between the mixing tank 1 and the outer side of the lower pressing cylinder 22 is mixed and stirred by using the stirring rod 23.

[0041] During this process, manually turn the screw handle 6 and move the switching slider 5 towards the outer pressure seat 21. When the switching slider 5 is inserted outside the outer pressure seat 21, the rib on the outside of the outer pressure seat 21 will press against the limit switch 24. The limit switch 24 is pressed and transmits data to the control computer 2. After being processed by the control computer 2, the repressing switch 16 starts to work. Thereafter, when the repressing switch 16 is pressed, the coil 26 starts to work, thereby generating a magnetic force that attracts the magnetic block 17. The magnetic block 17 drives the pressure rod seat 15 to move downward and presses the reset spring 151. During this process, the inner pressure pull rod 14 and the outer pressure pull rod 18 will move downward with the pressure rod seat 15. The outer pressure pull rod 18 presses the outer pressure spring 19, causing the outer pressure seat 21 to move downward. However, at this time, the side of the outer pressure seat 21 is blocked by the switching slider 5, so it cannot move downward. When the inner pressure pull rod 14 moves downward, it pushes the inner pressure support rod 12 to move downward synchronously through the inner pressure spring 13. When the inner pressure support rod 12 pushes the inner pressure seat 11 to move downward, the outside of the inner pressure seat 11 will move downward along the inside of the upper pressure cylinder 221. As Figure 3 shown, when the inner pressure seat 11 moves downward along the inside of the upper pressure cylinder 221, the pressure in the inner cavity of the upper pressure cylinder 221 will increase, so that the coating in the lower pressure cylinder 22 will flow to the outside of the lower pressure cylinder 22 after passing through the bottom of the mixing tank 1, thereby stirring the powder coating in the middle area of the lower pressure cylinder 22. When the outer pressure pull rod 18 moves downward and the stop switch 20 contacts the limit ejector rod 211, the pressed stop switch 20 will send a signal to the control computer 2 to stop the coil 26 from working. Thereafter, under the elastic force of the reset spring 151, the pressure rod seat 15 moves upward. At this time, the inner pressure seat 11 is pulled upward through the inner pressure pull rod 14, the inner pressure spring 13 and the inner pressure support rod 12. When the inner pressure seat 11 moves upward, the friction force between the outside of the inner pressure seat 11 and the limit ejector rod 211 will drive the upper pressure cylinder 221 to move upward synchronously. The upper pressure cylinder 221 and the lower pressure cylinder 22 are separated, so that the powder coating outside the upper pressure cylinder 221 flows into the lower pressure cylinder 22. As the upper pressure cylinder 221 continues to move upward, the upper pressure cylinder 221 will eventually abut against the limit ring 900 fixed outside the support rod 9. Blocked by the limit ring 900, the upward movement of the upper pressure cylinder 221 is limited. Along with the continuous upward movement of the inner pressure seat 11, the inner pressure seat 11 and the upper pressure cylinder 221 will eventually separate. The upper pressure cylinder 221 will move downward again under its own gravity and press on the top of the lower pressure cylinder 22. When the pressure rod seat 15 moves upward and presses the repressing switch 16, the coil 26 will be connected and work again. In this way, the inner pressure seat 11 moves up and down continuously. During this process, the powder coating inside the lower pressure cylinder 22 will be continuously extruded unidirectionally towards the outer area of the lower pressure cylinder 22, and finally the powder coating inside the mixing tank 1 will flow up and down in a cycle to enhance the effect of uniform mixing of the materials.

[0042] Moreover, during the process of the inner pressure seat 11 driving the upper pressure cylinder 221 to move upward, as the upper pressure cylinder 221 separates from the lower pressure cylinder 22, the support rod 9 will move upward under the elastic force of the vibration top spring 10, and synchronously pull the lower pressure cylinder 22 upward until the support rod 9 moves upward a certain distance and reaches the limit position (such as Figure 8 the limit sleeve located above the limit ring 900 as shown). After that, as the upper pressure cylinder 221 separates from the inner pressure seat 11, the upper pressure cylinder 221 moves downward and presses on the lower pressure cylinder 22 again, causing the lower pressure cylinder 22 to move downward again. In this way, the lower pressure cylinder 22 can continuously move up and down reciprocally, further enhancing the mixing efficiency of the powder coating in the mixing tank 1. And when the bottom plug 4 is opened, the floating lower pressure cylinder 22 can intensify the discharge of the powder coating, thereby increasing the discharge rate.

[0043] After the mixed powder coating in the mixing tank 1 is discharged from the bottom of the mixing tank 1, in order to reduce the coating adhered to the inner side of the mixing tank 1. The motor 25 stops working, and the screw handle 6 is turned to disengage the switching slider 5 from the outer pressure seat 21. Then, under the magnetic attraction of the coil 26, the pressure rod seat 15 moves downward again. Since the switching slider 5 releases the movement restriction on the outer pressure seat 21, when the pressure rod seat 15 drives the inner pressure pull rod 14 and the outer pressure pull rod 18 to move downward, the outer pressure seat 21 and the inner pressure seat 11 will move downward synchronously, and the outer pressure seat 21 is located below the inner pressure seat 11. The outer pressure seat 21 first scrapes the outer side wall of the upper pressure cylinder 221 and the inner side wall of the mixing tank 1. Moreover, as the outer pressure seat 21 moves downward, the stirring rod 23 moves along the radial direction of the upper pressure cylinder 221 towards its middle part by using the inclined surface at the bottom until the outer pressure seat 21 passes over the outside of the stirring rod 23. After that, as the inner pressure seat 11 moves downward, the inner side of the lower pressure cylinder 22 is scraped by the inner pressure seat 11, so as to scrape out the coating adhered to the inner side of the limit top rod 211. Then, it continues to move downward according to this method until the outer pressure seat 21 passes over the lower pressure cylinder 22 and reaches the inner bottom of the mixing tank 1, but the outer pressure seat 21 still does not completely separate from the lower pressure cylinder 22. As the inner pressure seat 11 continues to move downward, the inner side of the lower pressure cylinder 22 is also completely scraped out. Finally, the residual powder coating in the mixing tank 1 is scraped out and discharged from the bottom of the mixing tank 1.

[0044] As the pressure rod seat 15 continues to move downward, since the downward movement of the outer pressure seat 21 is blocked, the stop switch 20 will eventually abut against the limit top rod 211, and the stop switch 20 is pressed, causing the coil 26 to stop working. Then, under the elastic force of the return spring 151, the pressure rod seat 15 moves upward and resets. When the pressure rod seat 15 moves upward and abuts against the re-pressing switch 16, since the switching slider 5 is relatively far away from the outer pressure seat 21, the in-place switch 24 will not be activated. Therefore, the re-pressing switch 16 after being pressed will not be activated either. Finally, when the pressure rod seat 15 moves upward to the top limit, the whole device stops working.

Claims

1. A uniform mixing device for epoxy powder coating processing, characterized in that, Including: A mixing tank (1) with a feed pipe (3) fixed to its side, a bottom plug (4) installed at the bottom, a driving gear (7) and a driven gear (8) with external teeth meshing installed at the top, and the driving gear (7) is driven by a motor (25); A support rod (9) is movably installed on the driven gear (8). A pressing cylinder (22) is fixed to the bottom end of the support rod (9), and a stirring rod (23) is movably installed on the outside of the pressing cylinder (22); A pressure rod seat (15) is movably installed on the top of the mixing tank (1), and a return spring (151) is connected between the pressure rod seat (15) and the top of the mixing tank (1). A magnet block (17) is fixedly installed on the bottom surface of the pressure rod seat (15), a coil (26) is fixedly installed on the top of the mixing tank (1) below the magnet block (17), and an internal pressure pull rod (14) and an external pressure pull rod (18) are fixedly installed at the bottom of the pressure rod seat (15); An internal pressure seat (11) is installed on the internal pressure pull rod (14), and an external pressure seat (21) is installed on the external pressure pull rod (18); The pressing cylinder (22) is in the shape of a cylinder with a through middle part; The internal pressure seat (11) is located inside the pressing cylinder (22), the external pressure seat (21) is located between the outer side of the pressing cylinder (22) and the inner side of the mixing tank (1), and the cross-sectional shapes of both the internal pressure seat (11) and the external pressure seat (21) are isosceles trapezoids; An internal pressure support rod (12) is movably installed on the top of the internal pressure seat (11), and an internal pressure spring (13) is connected between the internal pressure support rod (12) and the internal pressure pull rod (14). An external pressure spring (19) is fixedly installed between the top of the external pressure seat (21) and the external pressure pull rod (18); A stop switch (20) is fixedly installed at the bottom of the external pressure pull rod (18), a limit top rod (211) located inside the external pressure spring (19) is fixedly installed on the top of the external pressure seat (21), and a control computer (2) is fixed on the outside of the mixing tank (1); A pressing cylinder (221) is movably installed on the outside of the support rod (9) above the pressing cylinder (22), and a stirring rod (23) is movably installed on the pressing cylinder (221). A switching slider (5) is movably installed on the outside of the mixing tank (1), and a screw handle (6) is threadedly connected to the switching slider (5), and the end of the screw handle (6) is installed on the outside of the mixing tank (1).

2. The uniform mixing device for epoxy powder coating processing according to claim 1, characterized in that, A rectangular groove is opened at the port of the switching slider (5), and a position switch (24) is fixedly installed in the rectangular groove. A rib is provided in the middle of the outside of the external pressure seat (21).

3. The uniform mixing device for epoxy powder coating processing according to claim 1, wherein, A re-pressing switch (16) is fixedly installed on the mixing tank (1) above the pressure rod seat (15).

4. The uniform mixing device for epoxy powder coating processing according to claim 1, characterized in that, A limit bolt is provided at the top of the support rod (9), and a vibration top spring (10) is connected between the limit bolt and the top of the driven gear (8).

5. The uniform mixing device for epoxy powder coating processing according to claim 4, characterized in that, A limit ring (900) is fixed on the outside of the support rod (9).

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