Uniform mixing device for processing epoxy powder coating

Abstract

The invention relates to the related technical field of coating mixing, discloses a uniform mixing device for processing an epoxy powder coating, and aims to solve the problem that excessive residues are left when a mixing tank pours out the coating, a stirring rod moving in the radial direction of a pressing cylinder is mounted on the pressing cylinder, and the stirring rod is thrown out under the rotation of the pressing cylinder, so that the coating is uniformly mixed. When the mixed coating needs to be poured out, the stirring rod is pressed through the outer pressing base and the inner pressing base in sequence, the inner side and the outer side of the lower pressing cylinder are scraped in sequence, in the process, when the stirring rod moves in the radial direction of the lower pressing cylinder, the coating adhering to the stirring rod can be scraped away, and finally the comprehensive cleaning effect is achieved.

Description

Technical Field

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

[0002] Epoxy powder coating is a thermosetting powder coating with excellent performance, which is widely favored for its excellent corrosion resistance and toughness. It is composed of a variety of key ingredients, including high-quality epoxy resin as the base material, carefully selected pigments and fillers to give the coating the required color and hiding power, and various additives such as leveling agents and antistatic agents to improve the processing properties 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 process of epoxy powder coatings mainly relies on the key equipment of the mixing tank. However, in actual operation, when the mixed paint is poured out of the mixing tank, a large amount of paint often remains inside the tank and on the stirring rod. These sticky paints not only waste raw materials, but also may affect the purity and performance consistency of subsequent batches of paint. If the mixing tank is cleaned directly to remove these residues, it will not only consume a lot of time and manpower, but also lead to higher cost losses due to the washed away paint. 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 and is used to solve the problem of excessive residue in the mixing tank when pouring out the coating in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a uniform mixing device for epoxy powder coating processing, comprising: a mixing tank, a feeding pipe is fixed on the side, a bottom plug is installed at the bottom, a driving gear and a driven gear with external teeth meshing are installed on the top, and the driving gear is driven by a motor; a support rod is movably installed on the driven gear, a lower pressure cylinder is fixed at the bottom of the support rod, and a stirring rod is movably installed on the outer side of the lower pressure cylinder; a pressure rod seat is 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, a coil located below the magnetic block is fixedly installed on the top of the mixing tank, and an internal pressure pull rod and an external pressure pull rod are fixedly installed on the bottom of the pressure rod seat; an internal pressure seat is installed on the internal pressure pull rod, and an external pressure seat is installed on the external pressure pull rod.

[0006] Furthermore, the shape of the lower pressure cylinder is a cylinder with a through middle portion.

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

[0008] Furthermore, an internal pressure support rod is movably installed on 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, and 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 push rod located inside the external pressure spring is fixedly installed on the top of the external pressure seat, and a control computer is fixed outside 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 on 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 provided at the port of the switching slider, an in-position switch is fixedly installed in the rectangular groove, and a convex strip is provided at the middle part of the outer side of the outer pressure seat.

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

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

[0014] Furthermore, a limiting ring is fixed on the outer side of the support rod.

[0015] The present invention has the following beneficial effects: The present invention provides a uniform mixing device for epoxy powder coating processing. When the lower pressing cylinder is driven by a driving device to rotate, the stirring rod on it will be thrown out due to the centrifugal force, thereby mixing and stirring the epoxy powder coating in an all-round way in a three-dimensional space. This stirring method not only ensures the uniformity of the coating, but also greatly improves the mixing efficiency.

[0016] When the mixing process is completed and the paint needs to be poured out, the stirring rod is pressed in turn by the external pressure seat and the internal pressure seat. This step is crucial because it not only makes the stirring rod move along the radial direction of the lower pressing 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 pressing cylinder, thereby scraping off and taking away the sticky paint on the stirring rod. At the same time, the further effect of the internal pressure seat also ensures that the inside of the lower pressing cylinder can also be effectively scraped to avoid paint residue.

[0017] The clever design of the cleaning mechanism is that it utilizes the natural characteristics of the stirring rod during radial movement to achieve double cleaning of the stirring rod and the lower pressure cylinder. This process is not only efficient but also comprehensive, ensuring that the device can be restored to its original state after each use, providing a clean and contamination-free environment for the next mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] The present invention may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall external three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall internal three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the overall internal planar cross-sectional structure of the present invention; Figure 4 for Figure 3 The enlarged structural diagram at E in the middle; Figure 5 for Figure 3 The enlarged structural diagram at F in the middle; Figure 6 for Figure 3 The enlarged structural diagram at G in the middle; Figure 7 It is a schematic diagram of the positions and structures of various components on the pressure rod seat of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the lower pressure cylinder of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the switching slider of the present invention.

[0020] 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. internal pressure seat; 12. internal pressure support rod; 13. internal pressure spring; 14. internal pressure pull rod; 15. pressure rod seat; 151, reset spring; 16. re-pressure switch; 17. magnetic block; 18. external pressure pull rod; 19. external pressure spring; 20. stop switch; 21. external pressure seat; 211, limit push rod; 22. lower pressure cylinder; 221, upper pressure cylinder; 23, stirring rod; 24, in-position switch; 25. motor; 26. coil. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a uniform mixing device for epoxy powder coating processing, which is intended to solve the problem of excessive coating residue when the coating in the mixing tank 1 is poured out. Figure 1 and Figure 2 It can be seen that the mixing tank 1 can be stably placed in a desired position through the bracket. A cavity is left inside the mixing tank 1, and the coating is fed through the feeding pipe 3 fixed on the side, so that the epoxy powder coating to be mixed is fed into the inner cavity of the mixing tank 1. After the stirring mechanism in the mixing tank 1 finishes stirring the epoxy powder coating, the bottom plug 4 movably installed at the bottom of the mixing tank 1 is removed, so that the epoxy powder coating stirred in the mixing tank 1 is poured out.

[0023] For details on the stirring mechanism, refer to Figure 2 , Figure 3 and Figure 8 It can be seen that a driven gear 8 is movably mounted on the top of the mixing tank 1, and a driving gear 7 driven by a motor 25 is movably mounted on the top of the mixing tank 1. The external teeth of the driving gear 7 and the driven gear 8 are meshed. When the motor 25 drives the driving gear 7 to rotate, the driven gear 8 can rotate synchronously, thereby providing sufficient power for subsequent stirring of the powder coating. Three support rods 9 are installed on the driven gear 8 at equal angles in a ring shape. The lower pressure cylinder 22 is fixedly mounted on the bottom end of the support rod 9, and as shown in FIG. Figure 3 and Figure 8 As shown, the lower pressing cylinder 22 is in the shape of a hollow cylinder, and a plurality of stirring rods 23 are movably installed on the outside. It should be noted that both ends of the stirring rod 23 are provided with a cylinder with a diameter slightly larger than the diameter of the middle part, and the inner and outer sides of the lower pressing cylinder 22 are provided with corresponding cylindrical grooves. This method not only limits the stirring rod 23 to only radially 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 cylinder. 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, and the stirring rod 23 moves outward under the action of centrifugal force until its end reaches the inner side of the lower pressing cylinder 22. At this time, the stirring work of the epoxy powder coating in the mixing tank 1 is completed by using the extended stirring rod 23.

[0024] After 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 amount of powder coating adhering to the inner wall of the mixing tank 1, the inner and outer sides of the lower pressure cylinder 22 and the stirring rod 23, the epoxy powder coating is poured out by opening the bottom plug 4. Figure 3-Figure 7It can be seen that a pressure rod seat 15 is movably installed on the top of the mixing tank 1, which reciprocates up and down along its axial direction. A reset spring 151 is connected between the pressure rod seat 15 and the top of the mixing tank 1. Under the elastic force of the reset spring 151, the pressure rod seat 15 always has a tendency to move upward, that is, it provides the upward power 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 on the top of the mixing tank 1. When the coil 26 is energized, it can generate magnetism that attracts the magnetic block 17, so that the pressure rod seat 15 moves downward and compresses the reset spring 151.

[0025] More importantly, from Figure 7 It can be seen that an inner pressure rod 14 and an outer pressure 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 rod 14, and the inner pressure seat 11 is located on the inner side of the lower pressure cylinder 22. The outer side of the inner pressure seat 11 is slidably connected to the inner side of the lower pressure cylinder 22. When the inner pressure seat 11 moves axially along the lower pressure cylinder 22, it can scrape the inner side of the lower pressure cylinder 22. Similarly, an outer pressure seat 21 is installed on the outer pressure rod 18, which is located between the outer side of the lower pressure cylinder 22 and the inner side of the mixing tank 1. 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 of the lower pressure cylinder 22, thereby reducing the raw materials adhering to this part. Not only that, refer to Figure 3 It can be clearly seen that the inner pressure seat 11 is an approximate cylinder with an isosceles trapezoidal cross-section, and the outer pressure seat 21 is also an approximate circular ring with an isosceles trapezoidal cross-section. The advantage of this arrangement is that when the coil 26 is energized and generates magnetism that attracts the magnetic block 17, the height difference between the inner pressure seat 11 and the outer pressure seat 21 causes the outer pressure seat 21 to contact the lower pressure cylinder 22 first. When the motor 25 stops working, the outer pressure seat 21 is pressed down, so that the paint adhered to the inner wall of the mixing tank 1 and the outer wall of the lower pressure cylinder 22 is scraped off, and the outer pressure seat 21 is pressed down. The bottom inclined surface of the pressure seat 21 abuts against the stirring rod 23, which will cause the stirring rod 23 to move radially along the lower pressing cylinder 22, and in the process of moving, the outer side of the stirring rod 23 is scraped by the lower pressing cylinder 22, and 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, and when the inner pressure seat 11 passes the inner side of the lower pressing cylinder 22, the paint adhered to the inner side wall of the lower pressing cylinder 22 can be scraped off. It can be seen from this that by scraping the mixing tank 1 and the lower pressing cylinder 22 successively by the outer pressure seat 21 and the inner pressure seat 11, the powder coating adhered to the inner and outer sides of the lower pressing cylinder 22, the outer side of the stirring rod 23, and the inner side wall of the mixing tank 1 can be greatly reduced.

[0026] On this basis, in order to avoid the problem of the outer pressure seat 21 / inner pressure seat 11 and the stirring rod 23 being stuck due to rigid contact, Figure 3-Figure 5 as well as Figure 7 It can be seen that the top of the inner pressure seat 11 has an inner pressure support rod 12 movably installed 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 the inner pressure seat 11 and the outer pressure seat 21 will not be stuck in the downward movement due to rigid direct contact. In addition, combined with Figure 3 , Figure 5 and Figure 7 It can be seen that a stop switch 20 is fixedly installed at the bottom of the external pressure rod 18, and correspondingly, a limit push rod 211 located on the inner side of the external pressure spring 19 is fixedly installed at the top of the external pressure seat 21. On the one hand, the limit push rod 211 can limit the movement of the external pressure spring 19. On the other hand, when the stop switch 20 on the external pressure rod 18 presses the limit push rod 211, it means that the external pressure seat 21 has moved to the bottom, and its signal is transmitted to the control computer 2 fixed on the outside of the mixing tank 1 through the stop switch 20, 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 reaches the bottom of the mixing tank 1, it is squeezed by the stop switch 20 to automatically cut off the power after reaching the downward limit, and the pressure rod seat 15 is pushed upward by the elastic force of the reset spring 151.

[0027] Furthermore, in order to achieve that the powder coating in the mixing tank 1 can flow up and down during the stirring process, thereby achieving more uniform material mixing, the Figure 3 and Figure 8 It can be seen that an upper pressure cylinder 221 located above the lower pressure cylinder 22 is movably mounted on the outer side of the support rod 9, and a plurality of stirring rods 23 are also movably arranged on the upper pressure cylinder 221. Figure 3 and Figure 6It can be seen that 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. The end of the screw handle 6 is installed on the outside of 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 arranged in the middle of the outer side of the outer pressure seat 21. When the outer pressure seat 21 moves up to the inner top limit of the mixing tank 1, it is blocked by the inner side of the mixing tank 1, which makes the outer pressure seat 21 unable to continue to move upward. At this time, by twisting the screw handle 6, the switching slider 5 can be pressed against the outer side of the outer pressure seat 21, and the position switch 24 on the switching slider 5 can be pressed against the convex strip arranged on the outer side of the outer pressure seat 21. Since the position switch 24 is placed in the groove, the position switch 24 can be squeezed only when the switching slider 5 is pressed against the outer side of the outer pressure seat 21. Furthermore, the signal of the squeeze of the in-place switch 24 is transmitted to the control computer 2, and the control computer 2 makes the re-pressure switch 16 fixed on the mixing tank 1 start to work. Figure 1 It can be seen that the re-pressure switch 16 is located above the pressure rod seat 15. When the pressure rod seat 15 moves up to the top, it will squeeze the re-pressure switch 16. When the re-pressure switch 16 starts to work, the re-pressure switch 16 after being pressurized will make the coil 26 start to work until the stop switch 20 is pressurized, thereby providing a signal to cut off the power to the coil 26. It can be seen that when the in-place switch 24 is pressurized, the re-pressure switch 16 can start to work, and the re-pressure switch 16 is pressurized to force the coil 26 to be energized, and after the stop switch 20 is pressurized, the coil 26 can be cut off again, and so on, which can ensure that the pressure rod seat 15 can reciprocate up and down along the top of the mixing tank 1.

[0028] More importantly, reference Figure 8 It can be seen that the top of the support rod 9 is movably mounted on the driven gear 8, and a limit bolt is provided on 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. The elastic force of the vibration top spring 10 forces the support rod 9 to have a tendency to pull the lower pressure cylinder 22 to move upward. It should be noted that the elastic force of the vibration top spring 10 can only realize the upward movement of the lower pressure cylinder 22. If the upper pressure cylinder 221 is pressed on the lower pressure cylinder 22, the weight of the upper pressure cylinder 221 and the lower pressure cylinder 22 is greater than the elastic force of the vibration top spring 10, so that the lower pressure cylinder 22 pulls the support rod 9 to move downward and squeezes the vibration top spring 10 at the same time.

[0029] Specifically, the main working method of the present application is as follows: Under normal conditions, the pressure rod seat 15 moves upward under the elastic force of the reset spring 151 until the pressure re-pressure switch 16 is squeezed. At this time, the switching slider 5 is relatively away from the external pressure seat 21 by twisting the screw handle 6. At the same time, when the pressure rod seat 15 moves upward to the top limit, the external pressure pull rod 18 and the internal pressure pull rod 14 move to the upward limit at the same time, and there is a tendency to pull the external pressure seat 21 upward through the external pressure spring 19 until the external pressure seat 21 moves upward to the limit; similarly, the internal pressure spring 13 pulls the internal pressure seat 11 upward to the limit through the internal pressure support rod 12. In addition, the internal pressure seat 11 is relatively located above the external pressure seat 21. The upper pressure cylinder 221 presses the lower pressure cylinder 22 under its own gravity, and the lower pressure cylinder 22 pulls the support rod 9 downward and compresses the vibration top spring 10.

[0030] The bottom of the mixing tank 1 is sealed by the bottom plug 4, and the epoxy powder coating is input into 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, and 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 outward under the action of centrifugal force until the stirring rod 23 reaches the inner side of the upper pressing cylinder 221 / lower pressing cylinder 22, and the stirring rod 23 is used to mix and stir the powder coating between the mixing tank 1 and the outer side of the lower pressing cylinder 22.

[0031] During this process, the screw handle 6 is manually turned to move the switching slider 5 toward the outer pressure seat 21. When the switching slider 5 is inserted to the outer side of the outer pressure seat 21, the convex strip on the outer side of the outer pressure seat 21 will hit the in-place switch 24. The in-place switch 24 is compressed and transmits data to the control computer 2. After being processed by the control computer 2, the re-pressure switch 16 starts to work. Thereafter, the re-pressure switch 16 is compressed to cause the coil 26 to start working, thereby generating a magnetic force that attracts the magnetic block 17. The magnetic block 17 drives the pressure rod seat 15 downward and suppresses the reset spring 151. During this process, the inner pressure rod 14 and the outer pressure rod 18 will move downward with the pressure rod seat 15, and the outer pressure rod 18 will suppress the outer pressure spring 19, so that the outer pressure seat 21 moves downward, but at this time, the side of the outer pressure seat 21 is blocked by the switching slider 5, so that it cannot move downward. When the inner pressure rod 14 moves downward, the inner pressure support rod 12 is pushed downward synchronously by the inner pressure spring 13. During the process of the inner pressure support rod 12 pushing the inner pressure seat 11 downward, the outer side of the inner pressure seat 11 moves downward along the inner side of the upper pressure cylinder 221. Figure 3As shown, when the inner pressure seat 11 moves downward along the inner side of the upper pressure cylinder 221, the pressure in the inner cavity of the upper pressure cylinder 221 will increase, so that the paint in the lower pressure cylinder 22 flows to the outer side of the lower pressure cylinder 22 after passing through the bottom of the mixing tank 1, thereby stirring the powder paint in the middle area of ​​the lower pressure cylinder 22. When the external pressure rod 18 moves downward and makes the stop switch 20 contact the limit push rod 211, the stop switch 20 under pressure will send a signal to the control computer 2 to stop the coil 26. Afterwards, the pressure rod seat 15 moves upward under the elastic force of the reset spring 151. At this time, the internal pressure rod 14, the internal pressure spring 13 and the internal pressure support rod 12 will pull the internal pressure seat 11 to move upward. When the inner pressure seat 11 moves upward, the friction between the outer side of the inner pressure seat 11 and the limit push rod 211 will drive the upper pressure cylinder 221 to move upward synchronously, and the upper pressure cylinder 221 and the lower pressure cylinder 22 will separate, so that the powder coating on the outer side of the upper pressure cylinder 221 flows into the lower pressure cylinder 22. As the upper pressure cylinder 221 continues to move upward, it will eventually hit the limit ring 900 fixed on the outer side of the support rod 9, and the upper pressure cylinder 221 will be blocked by the limit ring 900 to limit the upward movement of the upper pressure cylinder 221. As the inner pressure seat 11 continues to move upward, the inner pressure seat 11 and the upper pressure cylinder 221 will eventually separate, and 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 re-pressure switch 16, the coil 26 will be connected and work again, and the cycle will continue, so that the internal pressure seat 11 will continuously reciprocate up and down. During this process, the powder coating inside the lower pressure cylinder 22 will be squeezed unidirectionally and continuously toward the outer area of ​​the lower pressure cylinder 22, and finally the powder coating inside the mixing tank 1 will circulate up and down to enhance the effect of uniform mixing of materials.

[0032] Moreover, in the process that the inner pressure seat 11 drives the upper pressure cylinder 221 to move upward, as the upper pressure cylinder 221 and the lower pressure cylinder 22 separate, the support rod 9 moves upward under the elastic force of the vibration top spring 10, and simultaneously pulls the lower pressure cylinder 22 to move upward until the support rod 9 reaches the limit position after moving up a certain distance (such as Figure 8 Afterwards, as the upper pressure cylinder 221 and the inner pressure seat 11 are separated, the upper pressure cylinder 221 moves downward and presses the lower pressure cylinder 22 again, causing the lower pressure cylinder 22 to move downward again. This cycle allows the lower pressure cylinder 22 to continuously reciprocate up and down, further enhancing the mixing efficiency of the powder coating in the mixing tank 1. In addition, 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.

[0033] 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 twisted to make the switching slider 5 disengage from the outer pressure seat 21. Afterwards, 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 rod 14 and the outer pressure 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. In addition, as the outer pressure seat 21 moves downward, the inclined surface at the bottom is used to make the stirring rod 23 move radially toward the middle of the upper pressure cylinder 221 until the outer pressure seat 21 passes over the outer side of the stirring rod 23. Afterwards, 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 that the paint adhering to the inner side of the limiting push rod 211 is scraped out. Then, it continues to move downward in this manner 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 is not completely separated 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, and finally, the powder paint remaining in the mixing tank 1 is scraped out and discharged from the bottom of the mixing tank 1.

[0034] As the pressure rod seat 15 continues to move downward, the stop switch 20 will eventually hit the limit push rod 211 due to the obstruction of the outer pressure seat 21, and the stop switch 20 will be compressed, causing the coil 26 to stop working. Afterwards, the pressure rod seat 15 moves upward and resets under the elastic force of the reset spring 151. When the pressure rod seat 15 moves upward and hits the re-pressure switch 16, the in-position switch 24 will not be activated because the switching slider 5 is relatively far away from the outer pressure seat 21. Therefore, the re-pressure switch 16 after being compressed will not be activated. Finally, when the pressure rod seat 15 moves upward to the top limit, the entire device stops working.

Claims

1. A uniform mixing device for epoxy powder coating processing, characterized in that: include: A mixing tank (1) has a feed pipe (3) fixed to the side, a bottom plug (4) installed at the bottom, and a driving gear (7) and a driven gear (8) meshing with external teeth installed at the top, wherein the driving gear (7) is driven by a motor (25); A support rod (9) is movably mounted on the driven gear (8), a lower pressure cylinder (22) is fixed to the bottom end of the support rod (9), and a stirring rod (23) is movably mounted on the outer side of the lower pressure cylinder (22); A pressure rod seat (15) is movably mounted 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 magnetic block (17) is fixedly mounted on the bottom surface of the pressure rod seat (15). A coil (26) located below the magnetic block (17) is fixedly mounted on the top of the mixing tank (1). An inner pressure rod (14) and an outer pressure rod (18) are fixedly mounted on the bottom of the pressure rod seat (15); An internal pressure seat (11) is mounted on the internal pressure pull rod (14), and an external pressure seat (21) is mounted on the external pressure pull rod (18).

2. The uniform mixing device for epoxy powder coating processing according to claim 1, characterized in that: The lower pressing cylinder (22) is shaped like a cylinder with a through middle portion.

3. The uniform mixing device for epoxy powder coating processing according to claim 1, characterized in that: The inner pressure seat (11) is located inside the lower pressure cylinder (22), and the outer pressure seat (21) is located between the outer side of the lower pressure cylinder (22) and the inner side of the mixing tank (1). The cross-sectional shapes of the inner pressure seat (11) and the outer pressure seat (21) are both isosceles trapezoids.

4. The uniform mixing device for epoxy powder coating processing according to claim 1, characterized in that: An internal pressure support rod (12) is movably mounted 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), and an external pressure spring (19) is fixedly mounted between the top of the external pressure seat (21) and the external pressure pull rod (18).

5. The uniform mixing device for epoxy powder coating processing according to claim 4, characterized in that: A stop switch (20) is fixedly installed at the bottom of the external pressure pull rod (18), a limit push rod (211) located inside the external pressure spring (19) is fixedly installed at the top of the external pressure seat (21), and a control computer (2) is fixedly installed outside the mixing tank (1).

6. The uniform mixing device for epoxy powder coating processing according to claim 4, characterized in that: An upper pressure cylinder (221) located above the lower pressure cylinder (22) is movably mounted on the outer side of the support rod (9), and a stirring rod (23) is movably mounted on the upper pressure cylinder (221). A switching slider (5) is movably mounted on the outer side 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 mounted on the outer side of the mixing tank (1).

7. The uniform mixing device for epoxy powder coating processing according to claim 6, characterized in that: A rectangular groove is provided at the port of the switching slide block (5), in which an in-position switch (24) is fixedly installed, and a convex strip is provided at the middle part of the outer side of the outer pressure seat (21).

8. The uniform mixing device for epoxy powder coating processing according to claim 6, characterized in that: A re-pressure switch (16) located above the pressure rod seat (15) is fixedly mounted on the mixing tank (1).

9. The uniform mixing device for epoxy powder coating processing according to claim 6, characterized in that: A limit bolt is arranged on 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).

10. The uniform mixing device for epoxy powder coating processing according to claim 9, characterized in that: A limiting ring (900) is fixed on the outer side of the support rod (9).

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