Preparation equipment and method of polyester powder coating

Abstract

This invention relates to the field of powder coating production equipment technology, and discloses a preparation equipment and method for polyester powder coating, including a cooling cylinder with a feed inlet at the top. A material leveling hopper is located inside the cooling cylinder, directly below the feed inlet. A spiral material channel is fixedly connected to the inner wall of the cooling cylinder, located below the material leveling hopper. A first grinding disc and a second grinding disc are arranged inside the cooling cylinder, located around the outer edge of the material leveling hopper. A driving mechanism is located outside the cooling cylinder to drive the first and second grinding discs. A spraying mechanism is located inside the cooling cylinder, at its center. The material leveling hopper is conical. Multiple raised rings are arranged on the surface of the first grinding disc. Through the above-described technical solution, this invention can improve the cooling efficiency of the material.

Description

Technical Field

[0001] This invention relates to the field of powder coating production equipment technology, specifically to a preparation equipment and method for polyester powder coating. Background Technology

[0002] Polyester powder coatings are powder coatings with polyester resin as the main film-forming material. Due to their excellent adhesion, weather resistance, and leveling properties, they have been widely used in building materials, home appliances, hardware, and other fields. Currently, the industrial preparation process for polyester powder coatings typically involves multiple steps, including batching, mixing, extrusion, tableting and cooling, crushing and grinding. Among these, the tableting and cooling stage after extrusion directly affects the subsequent grinding efficiency and the particle size uniformity of the final coating product.

[0003] In current polyester powder coating production, extruded materials are often directly conveyed to flatbed presses for natural cooling, or a simple immersion cooling process is used. On the one hand, large extruded materials cool slowly and unevenly, often resulting in a situation where the surface has cooled and solidified while the internal temperature remains high. This not only slows down the overall production cycle but also easily leads to material softening and clumping, affecting subsequent crushing and grinding processes. On the other hand, conventional immersion cooling processes have low water utilization rates and cannot pre-crush clumped extruded materials, requiring additional pre-crushing equipment. This results in a long process flow and high equipment investment costs. Furthermore, during the conveying of cooled materials, material slippage and accumulation are common, affecting the continuous and stable operation of the production line. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a preparation device and preparation method for polyester powder coating, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a preparation device and method for polyester powder coating, including a cooling cylinder with a feed inlet at the top and a uniform hopper inside the cooling cylinder, the uniform hopper being located directly below the feed inlet. A spiral feed channel is fixedly connected to the inner wall of the cooling cylinder, the spiral feed channel being located below the uniform hopper. A first grinding disc and a second grinding disc are arranged inside the cooling cylinder, the first grinding disc and the second grinding disc being located around the outer ring of the uniform hopper. A driving mechanism is arranged outside the cooling cylinder to drive the first grinding disc and the second grinding disc. A spraying mechanism is arranged inside the cooling cylinder, the spraying mechanism being located at the center of the cooling cylinder.

[0006] It also includes that the material equalization hopper is conical, the surface of the first grinding disc is provided with multiple convex rings, and a fixing rod for connecting the material equalization hopper is fixedly connected to the inner wall of the cooling cylinder.

[0007] It also includes a drive mechanism comprising a first motor, which is mounted on the outer wall of the cooling cylinder. The output end of the first motor is fixedly connected to a driving bevel gear, and a driven bevel gear is rotatably connected to the outer wall of the cooling cylinder. A mounting box is fixedly connected to the driven bevel gear, and a first electric push rod is installed inside the mounting box. The first electric push rod is used to drive the first grinding disc.

[0008] It also includes a limiting port on the outer wall of the cooling cylinder, a connecting frame slidably connected inside the limiting port, the connecting frame being fixedly connected to the first grinding disc, and the connecting frame being slidably connected inside the mounting box.

[0009] It also includes a second electric push rod installed on the inner wall of the limiting port, the telescopic end of the second electric push rod being fixedly connected to the second grinding disc, a limiting block being fixedly connected to the second grinding disc, and the limiting block being slidably connected to the limiting port.

[0010] It also includes a second motor in the spraying mechanism, an installation platform fixedly connected inside the material hopper, the second motor being installed on the installation platform, a water pipe fixedly connected to the output end of the second motor, and multiple nozzles arranged in a ring fixedly connected to the water pipe.

[0011] It also includes that the nozzle is equipped with two water outlets, one above the other, and a liquid storage tank is fixedly connected inside the material hopper, and the liquid storage tank is connected to a water pipe.

[0012] It also includes a material-turning assembly fixedly connected to the end of the water pipe. The material-turning assembly consists of a connecting seat and multiple turning blades. The connecting seat is fixedly connected to the water pipe, and the multiple turning blades are fixedly connected to the connecting seat.

[0013] It also includes a conveyor belt located below the cooling cylinder, with protrusions fixedly connected to the surface of the conveyor belt, baffle rings on both sides of the conveyor belt, and multiple support frames fixedly connected to the bottom of the cooling cylinder.

[0014] This invention also provides a method for preparing polyester powder coatings, comprising the following steps: S1: Automatic batching and feeding: raw material storage silo group, ton bag unloading station, loss-in-weight weighing scale, vibrating discharge pipeline, negative pressure conveying fan, buffer hopper; S2: Sealed high-speed mixing: horizontal high-speed mixer, double-layer jacketed water-cooled cavity, high and low speed stirring paddle, discharge pneumatic butterfly valve, dust return pipeline; S3: Twin-screw spiral extrusion: forced feeder, co-rotating twin-screw extruder, segmented temperature-controlled heating cylinder, high-shear screw assembly, die head feeding assembly, screw cooling oil circuit; S4: Water-cooled pressing and crushing: The polyester powder coating preparation equipment of claims 1-9 is used for water cooling and crushing. S5: Grading Grinding: The vertical grinding host grinds the material and then sieves it through a vibrating screen.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: 1. This invention, through the combination of a uniform hopper and a spiral feed channel, can evenly disperse the high-temperature material after extrusion into the spiral feed channel. Compared with the traditional straight cooling path, it greatly extends the residence distance of the material in the cooling cylinder and prolongs the cooling time. With the spray mechanism that can rotate at the center, it can perform all-round uniform spray cooling on the material that gradually falls along the spiral feed channel, which not only improves the cooling efficiency but also ensures the uniformity of cooling in all parts of the material, avoiding the problems of surface cooling and solidification and internal heat accumulation and softening.

[0016] 2. This invention, through the first and second grinding discs arranged on the outer ring of the equalizing hopper, can pre-crush large, agglomerated extruded materials entering the equipment, compressing and breaking them into smaller pieces. This increases the contact area between the material and the cooling water, further improving the cooling effect, and eliminates the cost of additional pre-crushing equipment, thus shortening the overall process flow. The distance and relative position of the first and second grinding discs can be flexibly adjusted via the drive mechanism, enabling crushing operations on materials of different sizes and allowing for adjustment of the discharge position after crushing, ensuring smooth process transitions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the preparation method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the drive mechanism structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the spiral material channel structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the drive mechanism in an embodiment of the present invention; Figure 6 As described in the embodiments of the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the limiting port structure in an embodiment of the present invention; Figure 8 This is a schematic diagram of the conveyor belt structure in an embodiment of the present invention.

[0019] The labels in the diagram represent: 1. Cooling cylinder; 101. Feed inlet; 102. Support frame; 103. Limiting port; 2. Blending hopper; 3. Fixing rod; 4. Spiral feed channel; 5. Drive mechanism; 51. First motor; 52. Driving bevel gear; 53. Driven bevel gear; 54. Mounting box; 55. First electric push rod; 56. Connecting frame; 57. Second electric push rod; 58. Limiting block; 6. Spraying mechanism; 61. Second motor; 62. Water pipe; 63. Spray head; 64. Mounting platform; 7. Liquid storage tank; 8. Conveyor belt; 801. Material retaining ring; 802. Protrusion; 9. First grinding disc; 91. Convex ring; 10. Second grinding disc; 11. Turning assembly. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example 1: Please see Figures 2-8 This invention provides a technical solution: a polyester powder coating preparation device, including a cooling cylinder 1, a feed inlet 101 at the top of the cooling cylinder 1, a uniform hopper 2 inside the cooling cylinder 1 located directly below the feed inlet 101, a spiral feed channel 4 fixedly connected to the inner wall of the cooling cylinder 1 located below the uniform hopper 2, a first grinding disc 9 and a second grinding disc 10 inside the cooling cylinder 1, the first grinding disc 9 and the second grinding disc 10 located on the outer ring of the uniform hopper 2, and the first grinding disc 9 and the second grinding disc 10 are installed at an inclination inside the cooling cylinder 1, so that the material falling on the second grinding disc 10 can fall onto the first grinding disc 9 under the action of gravity, and then be crushed. After crushing, the inclination first grinding disc 9 rises and moves, thereby creating a gap between it and the uniform hopper 2, and the material falls onto the spiral feed channel 4 through the gap. A driving mechanism 5 is provided outside the cooling cylinder 1, the driving mechanism 5 being used to drive the first grinding disc 9 and the second grinding disc 10.

[0023] In practice: the set uniform hopper 2 can evenly disperse the crushed material into the spiral material channel 4. The spiral material channel 4 has a longer path than a straight path, which can extend the cooling time of the material, improve the cooling effect, and thus speed up the entire process. Under the control of the drive mechanism 5, the first grinding disc 9 and the second grinding disc 10 can crush the material, thereby avoiding the problem of large pieces of material clumping together and causing poor cooling effect. Crushing the material into small pieces can improve the cooling effect of the material.

[0024] Please see Figures 1-8 The present invention provides a technical solution: the uniform hopper 2 is conical, the surface of the first grinding disc 9 is provided with a plurality of convex rings 91, and the inner wall of the cooling cylinder 1 is fixedly connected with a fixing rod 3 for connecting the uniform hopper 2.

[0025] In practice: the multiple convex rings 91 can improve the crushing effect. The contact between the convex rings 91 and the material increases the friction, thereby squeezing and crushing large pieces of material, improving the crushing efficiency of agglomerated materials, and ensuring that the subsequent cooling process can proceed smoothly.

[0026] Please see Figures 1-8 The present invention provides a technical solution: the driving mechanism 5 includes a first motor 51, the first motor 51 is mounted on the outer wall of the cooling cylinder 1, the output end of the first motor 51 is fixedly connected to a driving bevel gear 52, the outer wall of the cooling cylinder 1 is rotatably connected to a driven bevel gear 53, the driven bevel gear 53 is fixedly connected to a mounting box 54, the mounting box 54 is equipped with a first electric push rod 55, and the first electric push rod 55 is used to drive the first grinding disc 9.

[0027] Please see Figures 1-8 The present invention provides a technical solution: a limiting port 103 is provided on the outer wall of the cooling cylinder 1, and a connecting frame 56 is slidably connected in the limiting port 103. The connecting frame 56 is fixedly connected to the first grinding disc 9, and the connecting frame 56 is slidably connected in the mounting box 54.

[0028] In specific implementation: the limit port 103 is set to the angle range of the first grinding disc 9 rotation, and the connecting frame 56 is slidably connected in the mounting box 54 and rotates synchronously with the mounting box 54.

[0029] Please see Figures 1-8 The present invention provides a technical solution: a second electric push rod 57 is installed on the inner wall of the limiting port 103, the telescopic end of the second electric push rod 57 is fixedly connected to the second grinding disc 10, a limiting block 58 is fixedly connected to the second grinding disc 10, and the limiting block 58 and the limiting port 103 are slidably connected.

[0030] In specific implementation: the limiting block 58 is used to limit the second grinding disc 10 to ensure that the second grinding disc 10 will not tilt during the movement, thus preventing it from accurately fitting with the first grinding disc 9.

[0031] In specific implementation: the drive mechanism 5 can drive the first grinding disc 9 and the second grinding disc 10 to move and rotate. The specific process is as follows: firstly, the second electric push rod 57 drives the second grinding disc 10 to move, thereby confining the material between the first grinding disc 9 and the second grinding disc 10. Then, the first motor 51 is started to drive the active bevel gear 52 to rotate. The active bevel gear 52 further drives the driven bevel gear 53 and the mounting box 54 to rotate synchronously. The connecting frame 56, which is slidably connected in the mounting box 54, drives the second grinding disc 10 to rotate synchronously, thereby crushing the material located between the first grinding disc 9 and the second grinding disc 10. After crushing, the second electric push rod 57 is started to move the second grinding disc 10 a certain distance. Then, the first electric push rod 55 drives the first grinding disc 9 to move, thereby creating a gap between the first grinding disc 9 and the uniform hopper 2. When the first grinding disc 9 is tilted, the material falls onto the spiral feed channel 4 under the influence of gravity.

[0032] Example 2: Please see Figures 2-8 Based on Embodiment 1, the present invention also provides a technical solution: a spraying mechanism 6 is provided inside the cooling cylinder 1, the spraying mechanism 6 is located at the center of the cooling cylinder 1, the spraying mechanism 6 includes a second motor 61, an installation platform 64 is fixedly connected inside the material equalization hopper 2, the second motor 61 is installed on the installation platform 64, a water pipe 62 is fixedly connected to the output end of the second motor 61, and a plurality of nozzles 63 arranged in a ring are fixedly connected to the water pipe 62.

[0033] In specific implementation: The spraying mechanism 6 is used to cool down the material falling in the spiral material channel 4, thereby improving the cooling efficiency of the material. During the spraying process, the second motor 61 is started to drive the water pipe 62 and the nozzle 63 to rotate, so that the material falling along the spiral material channel 4 can be sprayed evenly, ensuring that the material at each position can come into contact with the coolant and improving the overall cooling uniformity.

[0034] Please see Figures 1-8 The present invention provides a technical solution: the nozzle 63 is equipped with two water outlets, one above the other, and the liquid storage tank 7 is fixedly connected inside the material hopper 2. The liquid storage tank 7 is connected to the water pipe 62.

[0035] In practice: the two water outlets set at the top and bottom can simultaneously spray the material in the upper and lower layers of the spiral feed channel 4, further improving the coverage of spray cooling and ensuring uniform cooling effect.

[0036] Please see Figures 1-8 The present invention provides a technical solution: a material turning assembly 11 is fixedly connected to the end of the water pipe 62. The material turning assembly 11 consists of a connecting seat and multiple turning blades. The connecting seat is fixedly connected to the water pipe 62, and the multiple turning blades are fixedly connected to the connecting seat.

[0037] In practice: During the rotation of water pipe 62, the material turning component 11 is driven to rotate simultaneously. The turning blades can turn over the material that has fallen on the conveyor belt 8, so that the material can fully contact the cooling water, further improving the cooling effect and avoiding the problem of insufficient internal heat dissipation caused by material accumulation.

[0038] Please see Figures 1-8 The present invention provides a technical solution: a support frame 102 is provided below the cooling cylinder 1, and the support frame 102 is fixedly connected to the outer wall of the cooling cylinder 1 to support and fix the entire device and ensure the stability of the device during operation.

[0039] Example 3: Please see Figures 1-8 Based on Embodiment 1, the present invention also provides a technical solution: a conveyor belt 8 is provided below the cooling cylinder 1, a protrusion 802 is fixedly connected to the surface of the conveyor belt 8, baffle rings 801 are provided on both sides of the conveyor belt 8, and a plurality of support frames 102 are fixedly connected to the bottom of the cooling cylinder 1.

[0040] In specific implementation: the conveyor belt 8 is used to transport the cooled material, the protrusion 802 can create a gap between the material and the surface of the conveyor belt 8, thereby facilitating heat dissipation of the material and improving the cooling rate of the material, and the baffle ring 801 is used to prevent the material from falling.

[0041] This invention also provides a method for preparing polyester powder coatings, comprising the following steps: S1: Automatic batching and feeding: raw material storage silo group, ton bag unloading station, loss-in-weight weighing scale, vibrating discharge pipeline, negative pressure conveying fan, buffer hopper; S2: Sealed high-speed mixing: horizontal high-speed mixer, double-layer jacketed water-cooled cavity, high and low speed stirring paddle, discharge pneumatic butterfly valve, dust return pipeline; S3: Twin-screw spiral extrusion: forced feeder, co-rotating twin-screw extruder, segmented temperature-controlled heating cylinder, high-shear screw assembly, die head feeding assembly, screw cooling oil circuit; S4: Water-cooled pressing and crushing: The polyester powder coating preparation equipment as described in the claims is used for water cooling and crushing. S5: Grading Grinding: The vertical grinding host grinds the material and then sieves it through a vibrating screen.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation apparatus for polyester powder coating, comprising a cooling cylinder (1), characterized in that, The cooling cylinder (1) has a feed inlet (101) at the top and a uniform hopper (2) inside. The uniform hopper (2) is located directly below the feed inlet (101). A spiral channel (4) is fixedly connected to the inner wall of the cooling cylinder (1) and is located below the uniform hopper (2). The cooling cylinder (1) is provided with a first grinding disc (9) and a second grinding disc (10). The first grinding disc (9) and the second grinding disc (10) are located on the outer ring of the uniform hopper (2). The cooling cylinder (1) is provided with a driving mechanism (5) on the outside. The driving mechanism (5) is used to drive the first grinding disc (9) and the second grinding disc (10). The cooling cylinder (1) is equipped with a spray mechanism (6) located at the center of the cooling cylinder (1).

2. The equipment for preparing polyester powder coating according to claim 1, characterized in that: The material hopper (2) is conical in shape, and the surface of the first grinding disc (9) is provided with multiple convex rings (91). The inner wall of the cooling cylinder (1) is fixedly connected with a fixing rod (3) for connecting the material hopper (2).

3. The equipment for preparing polyester powder coating according to claim 2, characterized in that: The drive mechanism (5) includes a first motor (51), which is mounted on the outer wall of the cooling cylinder (1). The output end of the first motor (51) is fixedly connected to a driving bevel gear (52). A driven bevel gear (53) is rotatably connected to the outer wall of the cooling cylinder (1). A mounting box (54) is fixedly connected to the driven bevel gear (53). A first electric push rod (55) is installed inside the mounting box (54). The first electric push rod (55) is used to drive the first grinding disc (9).

4. The equipment for preparing polyester powder coating according to claim 3, characterized in that: A limiting port (103) is provided on the outer wall of the cooling cylinder (1). A connecting frame (56) is slidably connected in the limiting port (103). The connecting frame (56) is fixedly connected to the first grinding disc (9). The connecting frame (56) is slidably connected in the mounting box (54).

5. The equipment for preparing polyester powder coating according to claim 4, characterized in that: A second electric push rod (57) is installed on the inner wall of the limiting port (103). The telescopic end of the second electric push rod (57) is fixedly connected to the second grinding disc (10). A limiting block (58) is fixedly connected to the second grinding disc (10). The limiting block (58) and the limiting port (103) are slidably connected.

6. The equipment for preparing polyester powder coating according to claim 5, characterized in that: The spraying mechanism (6) includes a second motor (61), and an installation platform (64) is fixedly connected inside the material hopper (2). The second motor (61) is installed on the installation platform (64), and a water pipe (62) is fixedly connected to the output end of the second motor (61). Multiple nozzles (63) arranged in a ring are fixedly connected to the water pipe (62).

7. The equipment for preparing polyester powder coating according to claim 6, characterized in that: The nozzle (63) is equipped with two water outlets, one above the other. The liquid storage tank (7) is fixedly connected inside the material hopper (2). The liquid storage tank (7) is connected to the water pipe (62).

8. The equipment for preparing polyester powder coating according to claim 7, characterized in that: The end of the water pipe (62) is fixedly connected to a material turning assembly (11), which consists of a connecting seat and multiple turning blades. The connecting seat is fixedly connected to the water pipe (62), and the multiple turning blades are fixedly connected to the connecting seat.

9. The equipment for preparing polyester powder coating according to claim 8, characterized in that: A conveyor belt (8) is provided below the cooling cylinder (1). A protrusion (802) is fixedly connected to the surface of the conveyor belt (8). Baffle rings (801) are provided on both sides of the conveyor belt (8). Multiple support frames (102) are fixedly connected to the bottom of the cooling cylinder (1).

10. A method for preparing a polyester powder coating, using the equipment for preparing a polyester powder coating as described in any one of the claims, characterized in that: Includes the following steps: S1: Automatic batching and feeding: raw material storage silo group, ton bag unloading station, loss-in-weight weighing scale, vibrating discharge pipeline, negative pressure conveying fan, buffer hopper; S2: Sealed high-speed mixing: horizontal high-speed mixer, double-layer jacketed water-cooled cavity, high and low speed stirring paddle, discharge pneumatic butterfly valve, dust return pipeline; S3: Twin-screw spiral extrusion: forced feeder, co-rotating twin-screw extruder, segmented temperature-controlled heating cylinder, high-shear screw assembly, die head feeding assembly, screw cooling oil circuit; S4: Water-cooled pressing and crushing: The polyester powder coating preparation equipment as described in the claims is used for water cooling and crushing. S5: Grading Grinding: The vertical grinding host grinds the material and then sieves it through a vibrating screen.

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