Automatic grinding production equipment for polyester resin for powder coating

Abstract

The invention discloses automatic grinding production equipment for polyester resin for powder coating, and belongs to the technical field of powder coating production. The equipment comprises a grinding and screening barrel, a screening net, a grinding plate, a suction cavity and a feeding pipe, a screening groove is formed in the grinding and screening barrel, the screening net is installed in the screening groove, the grinding plate is configured to be driven to rotate in the grinding and screening barrel, and a gap is formed between the side wall of the grinding plate and the inner wall of the grinding and screening barrel; the side wall of the grinding plate and the inner wall of the grinding and screening barrel are combined to grind polyester resin in the gap, a push-pull piston is arranged in the suction cavity in a sliding mode, a suction pipe is connected to the suction cavity, the feeding pipe penetrates through one side wall of the grinding and screening barrel to extend into the grinding and screening barrel, and the push-pull piston is used for assisting the feeding pipe in feeding when sucking air flow. The invention particularly provides the automatic grinding production equipment for the polyester resin for the powder coating, which can reduce the size of the equipment, clean a screening net and assist feeding and discharging.

Description

Technical Field

[0001] The invention belongs to the technical field of powder coating production, in particular to an automatic grinding production device for polyester resin used in powder coating. Background Art

[0002] Powder coatings are suitable for products and facilities that do not require high corrosion resistance and weather resistance due to their advantages of being free of organic solvents, environmentally friendly (relative to oil-based coatings), high material utilization, and low energy consumption. They are currently widely used in many fields of the manufacturing industry. Among them, polyester powder coatings are widely used in outdoor facilities such as construction, automobiles, and transportation due to their excellent comprehensive performance and relatively low cost. Currently, more than half of thermosetting powder coatings are powder coatings prepared using polyester resin as the base material.

[0003] Grinding and screening are essential processes for producing polyester resin for powder coating. In the prior art, the grinding mechanism and screening mechanism of the powder coating production equipment are independently set, which leads to a large volume of the production equipment as a whole and requires a large production space. In the process of screening the powder coating, the powder coating is easy to adhere to the screen, affecting the screening efficiency. At the same time, the existing polyester resin production equipment for powder coating has the problem of poor feeding and discharging smoothness when feeding the polyester resin particles and discharging the prepared powder coating. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an automatic grinding production equipment for polyester resin for powder coatings, so as to at least partially solve the problems raised in the above background technology.

[0005] The present invention provides the following technical solution: An automatic grinding production equipment for polyester resin for powder coatings proposed by the present invention comprises: The grinding and screening cylinder is configured to be rotatable around its own central axis, and a screening slot is provided on the side wall of the grinding and screening cylinder, and the longitudinal section of the screening slot is a fan-shaped structure; A screening net is installed in the screening tank; A grinding plate is configured to be driven to rotate in the grinding and screening cylinder, a gap is provided between the side wall of the grinding plate and the inner wall of the grinding and screening cylinder, and the side wall of the grinding plate and the inner wall of the grinding and screening cylinder cooperate to grind the polyester resin in the gap; A suction chamber, wherein a push-pull piston is slidably arranged in the suction chamber, wherein the push-pull piston slides in the suction chamber to generate a suction airflow, wherein a suction pipe is connected to the suction chamber, wherein the suction pipe is located above the grinding and screening cylinder, and wherein the suction airflow acts on the screening net to clean the screening net; A feeding pipe, wherein the feeding pipe penetrates a side wall of the grinding and screening cylinder and extends into the grinding and screening cylinder. The push-pull piston sucks airflow to assist the feeding pipe in feeding.

[0006] Furthermore, an automatic grinding production equipment for polyester resin for powder coatings also includes an aggregate shell, and the two ends of the grinding and screening cylinder are rotatably arranged in the aggregate shell through two sets of rotating shafts, and the aggregate shell is used to collect the polyester resin powder screened by the grinding and screening cylinder; The rotating shaft is a hollow shaft, and the feeding pipe penetrates a group of rotating shafts at one end of the grinding and screening cylinder and extends into the grinding and screening cylinder.

[0007] Furthermore, a grinding shaft is rotatably provided in the rotating shaft at the other end of the grinding and screening cylinder, one end of the grinding shaft passes through the side wall of the grinding and screening cylinder and extends into the grinding and screening cylinder, the other end of the grinding shaft is externally connected to the output shaft of the grinding motor, and the end of the grinding shaft located in the grinding and screening cylinder is connected to the grinding plate through a fixed column.

[0008] Furthermore, when the grinding and screening drum and the grinding plate rotate at the same time, the grinding and screening of the polyester resin can be completed synchronously. In order to avoid the polyester resin being squeezed between the grinding plate and the polyester screening net when the screening net rotates to the bottom of the grinding plate, the rotating shaft and the axis of the grinding and screening drum are not colinear, and the radial length between the rotating shaft and the screening net is greater than the radial length of the grinding and screening drum.

[0009] Furthermore, a discharge port is provided on the bottom wall of the aggregate shell, and a discharge mechanism is provided at the lower part of the aggregate shell, and the discharge mechanism is located below the grinding and screening cylinder; The discharging mechanism includes a discharging motor, a discharging shaft and a spiral blade. The discharging shaft is rotatably arranged on the inner wall of the aggregate shell, one end of the discharging shaft passes through the side wall of the aggregate shell and extends to the outside of the aggregate shell. The discharging shaft is connected to the output shaft of the discharging motor, and the spiral blade is fixed on the discharging shaft.

[0010] Furthermore, a group of belt pulleys are fixedly disposed on one group of the rotating shafts and the discharging shaft correspondingly, and transmission belts are sleeved on the two groups of belt pulleys.

[0011] Furthermore, a suction shell is provided on the top wall of the aggregate shell, the suction chamber is provided in the suction shell, and the suction pipe penetrates the top wall of the aggregate shell and extends into the aggregate shell; A piston driving mechanism is fixedly provided on the outer wall of the aggregate shell, and the piston driving mechanism includes a push-pull motor and a push-pull connecting rod. A driving disk is fixedly provided on the output shaft of the push-pull motor, and a push-pull sliding rod is fixedly provided on the push-pull piston. One end of the push-pull sliding rod is slidably provided on the side wall of the suction shell, and a mounting plate is fixedly provided on the end of the push-pull sliding rod away from the push-pull piston. Both ends of the push-pull connecting rod are respectively hingedly connected to the driving disk and the mounting plate, and the push-pull connecting rod is hingedly connected to the driving disk.

[0012] Furthermore, a moving mechanism is provided in the aggregate shell, and the moving mechanism includes a moving motor, a moving screw and a sliding rod. The moving screw is rotatably arranged on the inner wall of the aggregate shell, and the moving motor is fixedly arranged on the outer wall of the aggregate shell. The moving screw is fixedly connected to the output shaft of the moving motor, and the sliding rod is fixedly arranged on the inner wall of the aggregate shell. The sliding rod is parallel to the moving screw, and a moving block is threadedly connected to the moving screw. The moving block is slidably arranged on the sliding rod, and the suction pipe is connected to the moving block.

[0013] Furthermore, the moving block is provided with multiple groups on the moving screw and the sliding rod, and the suction pipe is provided with multiple groups corresponding to the moving block.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The screen mesh on the grinding and screening drum cooperates with the rotating structure of the grinding and screening drum to realize the adjustment and switching of the grinding and screening state of the grinding and screening drum. The grinding and screening of polyester resin can be completed continuously in the grinding and screening drum, reducing the overall volume and floor space of the equipment.

[0015] (2) The airflow in the suction chamber is pushed and squeezed by sliding the push-pull piston in the suction chamber, and the airflow generated by the push and squeeze acts on the grinding and screening cylinder: when the push-pull piston pushes the airflow forward and is squeezed and ejected to act on the screening net, the surface of the screening net is cleaned to prevent the powder coating from adhering to the screening net and affecting the screening efficiency; when the push-pull piston is pulled back to suck the airflow, the airflow pressure in the grinding and screening cylinder becomes smaller, and the polyester resin particles in the feeding pipe can smoothly enter the grinding and screening cylinder, thereby achieving efficient feeding.

[0016] (3) By setting up the discharging mechanism, while the grinding plate rotates to grind the polyester resin, the sieved polyester resin powder is assisted to be discharged, thereby improving the discharging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 is a schematic diagram of a three-dimensional cross-sectional structure in the main viewing direction of an embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of part A; Figure 4 It is a schematic diagram of a side perspective cross-sectional structure of an aggregate shell according to an embodiment of the present invention; Figure 5 It is a schematic diagram of a side perspective cross-sectional structure of an aggregate housing and a grinding and screening cylinder according to an embodiment of the present invention; Figure 6 for Figure 5 A partial enlarged view of part B; Figure 7 Schematic diagram of the structure of the piston drive mechanism according to an embodiment of the present invention.

[0018] Among them, 1. grinding and screening cylinder, 2. screening net, 3. grinding plate, 4. suction chamber, 5. push-pull piston, 6. suction pipe, 7. feeding pipe, 8. aggregate shell, 9. rotating shaft, 10. grinding shaft, 11. grinding motor, 12. fixed column, 13. discharge port, 14. discharge mechanism, 15. discharge motor, 16. discharge shaft, 17. spiral blade, 18. transmission belt, 19. suction shell, 20. piston driving mechanism, 21. push-pull motor, 22. push-pull connecting rod, 23. driving disk, 24. push-pull sliding rod, 25. mounting plate, 26. moving mechanism, 27. moving motor, 28. moving screw, 29. sliding rod, 30. moving block. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] This embodiment is an improvement on the technical problems of the existing automated grinding production equipment for polyester resin for powder coatings, in which the grinding mechanism and the screening mechanism are independently arranged, resulting in a relatively large overall volume of the equipment, and the polyester resin powder coating obtained during screening easily adheres to the screen, affecting the screening efficiency, and the loading and discharging smoothness is poor.

[0022] See also Figure 1 and Figure 2 The present embodiment provides an automatic grinding production equipment for polyester resin for powder coating, comprising: The grinding and screening drum 1 is configured to be rotatable around its own central axis, and a screening slot is provided on the side wall of the grinding and screening drum 1, and the longitudinal section of the screening slot is a fan-shaped structure; A screening net 2 is installed in the screening tank; The grinding plate 3 is configured to be driven to rotate in the grinding and screening cylinder 1, and there is a gap between the side wall of the grinding plate 3 and the inner wall of the grinding and screening cylinder 1. The side wall of the grinding plate 3 and the inner wall of the grinding and screening cylinder 1 work together to grind the polyester resin in the above gap; During specific use, the relative positions of the grinding plate 3 and the screening net 2 are adjusted by rotating the grinding and screening drum 1. When the screening net 2 rotates to above the grinding plate 3, the side wall of the grinding and screening drum 1 below the grinding plate 3 is a solid plate structure. The rotating grinding plate 3 cooperates with the solid inner wall of the grinding and screening drum 1 to grind the polyester resin into powder, and during the rotation of the grinding and screening drum 1, the powdered polyester resin is screened by using centrifugal force.

[0023] A suction chamber 4, in which a push-pull piston 5 is slidably provided, the push-pull piston 5 slides in the suction chamber 4 to generate a suction airflow, the suction chamber 4 is connected with a suction pipe 6, the suction pipe 6 is located above the grinding and screening cylinder 1, and the suction airflow acts on the screening net 2 to clean the screening net 2; During specific use, when the screening net 2 is adjusted to the bottom of the suction pipe 6 as the grinding and screening drum 1 rotates, the air in the suction chamber 4 is sucked and squeezed by pushing and pulling the piston 5 sliding in the suction chamber 4 to generate a suction airflow. When the suction airflow is squeezed and ejected, the screening net 2 below the suction pipe 6 can be cleaned.

[0024] The feeding pipe 7 passes through a side wall of the grinding and screening cylinder 1 and extends into the grinding and screening cylinder 1. The push-pull piston 5 is used to assist the feeding pipe 7 in feeding when sucking the airflow. During specific use, when the push-pull piston 5 slides in the suction chamber 4 to suck the airflow, the pressure in the screening grinding cylinder changes. Under the action of the suction pressure, the polyester resin particles in the feeding pipe 7 are assisted to be fed smoothly, which can effectively avoid the polyester resin particles from being blocked in the feeding pipe 7.

[0025] Specifically, see Figure 1-Figure 3 The polyester resin automatic grinding production equipment for powder coating provided in this embodiment also includes an aggregate shell 8, and the two ends of the grinding and screening cylinder 1 are rotatably arranged in the aggregate shell 8 through two sets of rotating shafts 9, and the aggregate shell 8 is used to collect the polyester resin powder screened by the grinding and screening cylinder 1; When in use, when the screening drum rotates, the polyester resin powder with the required particle size is screened out through the screening net 2 under the action of centrifugal force, and falls into the aggregate shell 8 for collection; The rotating shaft 9 is a hollow shaft, and the feeding pipe 7 passes through a group of rotating shafts 9 at one end of the grinding and screening cylinder 1 and extends into the grinding and screening cylinder 1. The hollow structure of this group of rotating shafts 9 can avoid interference between the rotation of the grinding and screening cylinder 1 and the installation position of the feeding pipe 7.

[0026] Specifically, see Figure 2 and Figure 3 In this embodiment, a grinding shaft 10 is rotatably provided in the rotating shaft 9 at the other end of the grinding and screening cylinder 1, one end of the grinding shaft 10 passes through the side wall of the grinding and screening cylinder 1 and extends into the grinding and screening cylinder 1, the other end of the grinding shaft 10 is externally connected to the output shaft of the grinding motor 11, and the end of the grinding shaft 10 located in the grinding and screening cylinder 1 is connected to the grinding plate 3 through a fixed column 12.

[0027] When in use, the grinding plate 3 is driven to rotate through the grinding shaft 10 under the action of the grinding motor 11, and the polyester resin particles between the grinding plate 3 and the inner wall of the grinding and screening cylinder 1 are ground under the cooperation of the grinding plate 3 and the inner wall of the grinding and screening cylinder 1.

[0028] Specifically, see Figure 4 In this embodiment, when the grinding and screening drum 1 and the grinding plate 3 rotate at the same time, the grinding and screening processing of the polyester resin can be completed synchronously. In order to avoid that the polyester resin is squeezed between the grinding plate 3 and the polyester screening net 2 when the screening net 2 rotates to the bottom of the grinding plate 3, the rotating shaft 9 is not colinear with the axis of the grinding and screening drum 1, and the radial length between the rotating shaft 9 and the screening net 2 is greater than the radial length of the grinding and screening drum 1, that is, the rotating shaft 9 is set in an eccentric position relative to the end face of the grinding and screening drum 1.

[0029] By eccentrically setting the rotating shaft 9 relative to the end face of the grinding and screening drum 1, the grinding and screening drum 1 rotates with the rotating shaft 9 as the central axis instead of the central axis of the grinding and screening drum 1. When the grinding and screening drum 1 and the grinding plate 3 rotate simultaneously, it can ensure that the grinding plate 3 and the solid inner wall of the grinding and screening drum 1 cooperate to grind the polyester resin particles, and it can also avoid that when the screening net 2 rotates to the bottom of the grinding plate 3, the grinding force of the grinding plate 3 directly acts on the screening net 2 to cause damage to the screening net 2.

[0030] Specifically, see Figure 2 and Figure 3 In this embodiment, a discharge port 13 is provided on the bottom wall of the aggregate shell 8, and a discharge mechanism 14 is provided at the lower part of the aggregate shell 8. The discharge mechanism 14 is located below the grinding and screening cylinder 1, and the discharge mechanism 14 is used to discharge the screened polyester resin powder from the aggregate shell 8; The discharging mechanism 14 includes a discharging motor 15, a discharging shaft 16 and a spiral blade 17. The discharging shaft 16 is rotatably arranged on the inner wall of the aggregate shell 8. One end of the discharging shaft 16 passes through the side wall of the aggregate shell 8 and extends to the outside of the aggregate shell 8. The discharging shaft 16 is connected to the output shaft of the discharging motor 15. The spiral blade 17 is fixed on the discharging shaft 16. The discharging shaft 16 is driven to rotate under the action of the discharging motor 15. When the discharging shaft 16 rotates, the polyester resin powder sifted into the aggregate shell 8 is output through the discharging port 13 through the spiral blade 17, thereby improving the smoothness of the discharging.

[0031] Specifically, see Figure 2 and Figure 3 In this embodiment, a group of belt pulleys are fixedly provided on a set of rotating shafts 9 and a discharging shaft 16 correspondingly, and a transmission belt 18 is sleeved on the two groups of belt pulleys. Under the action of the transmission belt 18, the discharging motor 15 drives the rotating shaft 9 to rotate. There is no need to set up a separate motor. The grinding and screening drum 1 can be driven to rotate while discharging. When the grinding and screening drum 1 rotates, the polyester resin powder obtained by grinding is screened.

[0032] Specifically, see Figure 1 , Figure 2 and Figure 7 In this embodiment, a suction shell 19 is provided on the top wall of the aggregate shell 8, the suction chamber 4 is provided in the suction shell 19, and the suction pipe 6 penetrates the top wall of the aggregate shell 8 and extends into the aggregate shell 8; A piston driving mechanism 20 is fixedly provided on the outer wall of the aggregate shell 8, and the piston driving mechanism 20 includes a push-pull motor 21 and a push-pull connecting rod 22. A driving disk 23 is fixedly provided on the output shaft of the push-pull motor 21, and a push-pull slide rod 24 is fixedly provided on the push-pull piston 5. One end of the push-pull slide rod 24 is slidably arranged on the side wall of the suction shell 19, and a mounting plate 25 is fixedly provided on the end of the push-pull slide rod 24 away from the push-pull piston 5. The two ends of the push-pull connecting rod 22 are respectively hingedly connected to the driving disk 23 and the mounting plate 25, and the push-pull connecting rod 22 is hingedly connected to the driving disk 23.

[0033] When in use, the push-pull motor 21 drives the driving disk 23 to rotate, and the push-pull connecting rod 22 drives the push-pull slide bar 24 and the push-pull piston 5 to slide in the suction chamber 4, thereby realizing the suction and extrusion of the airflow.

[0034] Specifically, see Figure 1 , Figure 2 , Figure 5 and Figure 6In this embodiment, a moving mechanism 26 is provided in the aggregate shell 8, and the moving mechanism 26 includes a moving motor 27, a moving screw 28 and a sliding rod 29. The moving screw 28 is rotatably arranged on the inner wall of the aggregate shell 8, and the moving motor 27 is fixedly arranged on the outer wall of the aggregate shell 8. The moving screw 28 is fixedly connected to the output shaft of the moving motor 27, and the sliding rod 29 is fixedly arranged on the inner wall of the aggregate shell 8. The sliding rod 29 is parallel to the moving screw 28. A moving block 30 is threadedly connected to the moving screw 28, and the moving block 30 is slidably arranged on the sliding rod 29. Under the driving action of the moving screw 28 and the guiding action of the sliding rod 29, the moving block 30 is driven to realize position movement. The suction pipe 6 is connected to the moving block 30. Under the action of the moving mechanism 26, the position of the suction pipe 6 is adjusted, thereby expanding the coverage range of the suction pipe 6 and performing full coverage cleaning on the screening net 2.

[0035] Specifically, see Figure 2 In this embodiment, a plurality of moving blocks 30 are provided on the moving screw 28 and the sliding rod 29 , and a plurality of suction pipes 6 and the moving blocks 30 are provided correspondingly.

[0036] The working principle of the polyester resin automatic grinding production equipment for powder coating provided in this embodiment is as follows: (1) In the initial state, the screening net 2 of the grinding and screening cylinder 1 is located directly below the suction pipe 6, and the polyester resin particles are added into the grinding and screening cylinder 1 through the feeding pipe 7; When feeding, the push-pull motor 21 is started, and the push-pull motor 21 drives one end of the push-pull connecting rod 22 to rotate synchronously therewith, and the other end of the push-pull connecting rod 22 drives the push-pull piston 5 to slide in the suction chamber 4 through the push-pull sliding rod 24, and a suction extrusion airflow is generated when the push-pull piston 5 slides, and a suction airflow is generated when the push-pull piston 5 slides backward along the suction chamber 4, and the polyester resin is smoothly fed under the action of the suction airflow; (2) After the loading is completed, the push-pull motor 21 is turned off, and the grinding motor 11 and the discharging motor 15 are started; The grinding motor 11 drives the grinding plate 3 to rotate through the grinding shaft 10, and the grinding plate 3 cooperates with the solid inner wall of the grinding and screening cylinder 1 to complete the grinding of the polyester resin particles; When the discharging motor 15 is working: On the one hand, the rotating shaft 9 is driven to rotate by the transmission belt 18, and the rotating shaft 9 drives the grinding and screening drum 1 to rotate. When the grinding and screening drum 1 rotates, the ground polyester resin powder is screened under the action of centrifugal force, and the screened polyester resin powder that meets the requirements falls into the aggregate shell 8; On the other hand, the discharging motor 15 drives the discharging shaft 16 to rotate, and the screened polyester resin powder is discharged through the discharging port 13 under the action of the spiral blade 17; (3) After each grinding and screening for a certain period of time, the discharging motor 15 is turned off, the screening net 2 of the grinding and screening cylinder 1 stops below the suction pipe 6, and the push-pull motor 21 is restarted. When the push-pull slide rod 24 pushes the push-pull piston 5 forward in the suction chamber 4, the forward-pushing push-pull piston 5 squeezes the airflow in the suction chamber 4, and the squeezed airflow is ejected to act on the screening net 2 to clean the screening net 2; During the cleaning process, the moving motor 27 is started, and the moving motor 27 drives the moving screw 28 to rotate. Under the drive of the moving screw 28 and the guidance of the sliding rod 29, the moving block 30 is driven to move. When the moving block 30 moves, it drives the suction pipe 6 to move, thereby adjusting the position of the suction pipe 6 relative to the screening net 2. Multiple groups of suction pipes 6 that can be moved can cooperate to complete the full coverage cleaning of the screening net 2.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic grinding production equipment for polyester resin for powder coating, characterized in that: include: The grinding and screening cylinder (1) is configured to be rotatable around its own central axis, a screening slot is provided on the side wall of the grinding and screening cylinder (1), and the longitudinal section of the screening slot is a fan-shaped structure; A screening net (2) installed in the screening tank; A grinding plate (3) is configured to be driven to rotate in the grinding and screening cylinder (1), a gap is provided between the side wall of the grinding plate (3) and the inner wall of the grinding and screening cylinder (1), and the side wall of the grinding plate (3) and the inner wall of the grinding and screening cylinder (1) work together to grind the polyester resin in the gap; A suction chamber (4), wherein a push-pull piston (5) is slidably provided in the suction chamber (4), wherein the push-pull piston (5) slides in the suction chamber (4) to generate a suction airflow, wherein a suction pipe (6) is connected to the suction chamber (4), wherein the suction pipe (6) is located above the grinding and screening cylinder (1), and wherein the suction airflow acts to clean the screening net (2); A feeding pipe (7), wherein the feeding pipe (7) penetrates a side wall of the grinding and screening cylinder (1) and extends into the grinding and screening cylinder (1); the push-pull piston (5) is used to assist the feeding pipe (7) in feeding when sucking air flow.

2. The automatic grinding production equipment for polyester resin for powder coating according to claim 1, characterized in that: It also comprises an aggregate shell (8), wherein the two ends of the grinding and screening cylinder (1) are rotatably arranged in the aggregate shell (8) via two sets of rotating shafts (9), and the aggregate shell (8) is used to collect the polyester resin powder screened by the grinding and screening cylinder (1); The rotating shaft (9) is a hollow shaft, and the feeding pipe (7) penetrates a group of rotating shafts (9) at one end of the grinding and screening cylinder (1) and extends into the grinding and screening cylinder (1).

3. The automatic grinding production equipment for polyester resin for powder coating according to claim 2, characterized in that: A grinding shaft (10) is rotatably provided in the rotating shaft (9) at the other end of the grinding and screening cylinder (1); one end of the grinding shaft (10) passes through the side wall of the grinding and screening cylinder (1) and extends into the grinding and screening cylinder (1); the other end of the grinding shaft (10) is externally connected to the output shaft of a grinding motor (11); and one end of the grinding shaft (10) located in the grinding and screening cylinder (1) is connected to the grinding plate (3) via a fixing column (12).

4. The automatic grinding production equipment for polyester resin for powder coating according to claim 3, characterized in that: The rotating shaft (9) and the axis of the grinding and screening drum (1) are not colinear, and the radial length between the rotating shaft (9) and the screening net (2) is greater than the radial length of the grinding and screening drum (1).

5. The automatic grinding production equipment for polyester resin for powder coating according to claim 2, characterized in that: A discharge port (13) is provided on the bottom wall of the aggregate shell (8), a discharge mechanism (14) is provided at the lower part of the aggregate shell (8), and the discharge mechanism (14) is located below the grinding and screening cylinder (1); The discharging mechanism (14) comprises a discharging motor (15), a discharging shaft (16) and a spiral blade (17); the discharging shaft (16) is rotatably arranged on the inner wall of the aggregate shell (8); one end of the discharging shaft (16) passes through the side wall of the aggregate shell (8) and extends to the outside of the aggregate shell (8); the discharging shaft (16) is connected to the output shaft of the discharging motor (15); and the spiral blade (17) is fixedly arranged on the discharging shaft (16).

6. The automatic grinding production equipment for polyester resin for powder coating according to claim 5, characterized in that: A group of belt pulleys are fixedly disposed on one group of the rotating shafts (9) and the discharging shaft (16) correspondingly, and a transmission belt (18) is sleeved on the two groups of belt pulleys.

7. The automatic grinding production equipment for polyester resin for powder coating according to claim 2, characterized in that: A suction shell (19) is provided on the top wall of the aggregate shell (8), the suction chamber (4) is provided in the suction shell (19), and the suction pipe (6) penetrates the top wall of the aggregate shell (8) and extends into the aggregate shell (8); A piston drive mechanism (20) is fixedly provided on the outer wall of the aggregate shell (8), and the piston drive mechanism (20) comprises a push-pull motor (21) and a push-pull connecting rod (22). A drive disk (23) is fixedly provided on the output shaft of the push-pull motor (21). A push-pull slide rod (24) is fixedly provided on the push-pull piston (5). One end of the push-pull slide rod (24) is slidably provided on the side wall of the suction shell (19). A mounting plate (25) is fixedly provided on the end of the push-pull slide rod (24) away from the push-pull piston (5). The two ends of the push-pull connecting rod (22) are respectively hingedly connected to the drive disk (23) and the mounting plate (25), and the push-pull connecting rod (22) is hingedly connected to the drive disk (23).

8. The automatic grinding production equipment for polyester resin for powder coating according to claim 2, characterized in that: A moving mechanism (26) is provided inside the aggregate shell (8), and the moving mechanism (26) comprises a moving motor (27), a moving screw (28) and a sliding rod (29); the moving screw (28) is rotatably arranged on the inner wall of the aggregate shell (8); the moving motor (27) is fixedly arranged on the outer wall of the aggregate shell (8); the moving screw (28) is fixedly connected to the output shaft of the moving motor (27); the sliding rod (29) is fixedly arranged on the inner wall of the aggregate shell (8); the sliding rod (29) is parallel to the moving screw (28); a moving block (30) is threadedly connected to the moving screw (28); the moving block (30) is slidably arranged on the sliding rod (29); and the suction pipe (6) is connected to the moving block (30).

9. The automatic grinding production equipment for polyester resin for powder coating according to claim 8, characterized in that: The moving block (30) is provided in multiple groups on the moving screw rod (28) and the sliding rod (29), and the suction pipe (6) is provided in multiple groups corresponding to the moving block (30).

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