Epoxy polyester powder coating production equipment and production process

Abstract

The present invention relates to the technical field of powder coating production, and specifically to an epoxy polyester powder coating production device, comprising: a cooling conveyor belt, a crusher installed at the end of the cooling conveyor belt in the feeding direction, the crusher having a vertical downward discharge port, a collection box placed on one side of the cooling conveyor belt, and the collection box is located directly below the discharge port, and a dust removal unit is installed at the discharge port. The present invention cooperates with the dust removal unit through an adjustment unit, so that the dust removal unit can suck air in any horizontal direction where dust is generated by the epoxy polyester powder coating production device with the same suction force, thereby solving the problem of low dust removal efficiency of the dust removal unit in the existing equipment, improving the safety of the epoxy polyester powder coating production device, and ensuring the health and safety of workers when using the epoxy polyester powder coating production device. The present invention also provides a production process using the epoxy polyester powder coating production device.

Description

Technical Field

[0001] The present invention relates to the technical field of powder coating production, in particular to epoxy polyester powder coating production equipment and a production process. Background Art

[0002] Existing epoxy polyester powder coatings are generally produced using a melt mixing method. The production process generally includes batching, pre-mixing, melt extrusion, cooling and tableting, coarse grinding, fine grinding, grading and screening, and finished product packaging. During the cooling and tableting and coarse grinding process, to prevent further chemical reactions in the molten extruded material, the material is pressed into thin flakes using cooling rollers. The flakes are then further cooled to below 35°C by a cooling conveyor belt, which brings them to the required size for fine grinding. The flakes are then transported by the cooling conveyor belt onto the crusher platform, where they are crushed into fragments of various shapes. The fragments then fall into a collection bin at the crusher's outlet.

[0003] According to Zou Lijian's "Dust Emission and Control in Powder Coating Production", when the tablets are crushed by the crusher, in addition to producing fragments of various shapes, dust is also produced. When these dusts are inhaled into the human lungs, smaller particles will enter the respiratory system, which can easily cause respiratory diseases after a long time. The existing large-scale epoxy polyester powder coating production line uses fully enclosed automatic transportation equipment to connect each production equipment, and there will be no dust problem. However, due to space problems, some workshops are limited and the production equipment is installed in groups and materials are collected through containers. The existing ones will assemble the melt extruder, cooling conveyor belt and crusher together, and use a collection box at the crusher outlet to collect tablet fragments. The existing dust solution is to set an air suction port at the crusher outlet to suck away the dust, but in order to observe the collection situation of the collection box, a certain distance will be left between the collection box and the crusher outlet, so the crusher outlet and the collection box are separated. The boxes are completely open, which results in stronger suction near the air inlet, resulting in better dust removal, while the suction away from the air inlet is weak and the dust removal effect is poor. If the suction at the air inlet is increased so that the effective coverage area is larger, the above problem can be solved. However, since the tablet fragments are very light, there is an upper limit to the suction force of the air inlet. Suction exceeding the upper limit will affect the falling trajectory of the tablet fragments, so that the fragments may not fall into the collection box, affecting the normal production of epoxy polyester powder coatings. It is even possible that the fragments are sucked into the air inlet, causing the air inlet to become blocked and ineffective, causing damage to the machine. Therefore, most of the dust in production will still spread in the workshop, which will not only affect the safety in the workshop, but also seriously endanger the health of the workers if they inhale this dust for a long time.

[0004] To this end, an epoxy polyester powder coating production equipment and production process are proposed. Through the cooperation of the dust removal unit and the adjustment unit, suction is generated in any horizontal direction at the dust generation point of the dust removal unit, and the suction is at the upper limit value, thereby increasing the safety of the epoxy polyester powder coating production process. Summary of the Invention

[0005] The purpose of the present invention is to provide an epoxy polyester powder coating production device and a production process. The present invention ensures the safety of the epoxy polyester powder coating production process by controlling the concentration of dust in the production process and preventing the dust from spreading in the workshop. Therefore, the present invention combines the adjustment unit with the existing dust removal unit so that the suction force in any horizontal direction at the dust generation point of the dust removal unit is the same and is at the upper limit value, further increasing the dust removal effect to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A cooling conveyor belt is used to cool the epoxy polyester tablets to below 35°C. A crusher is installed at the end of the cooling conveyor belt in the feeding direction. The crusher is used to crush the epoxy polyester tablets into fragments. The crusher is provided with a discharge port, and the discharge port is oriented vertically downward. A collection box for holding epoxy polyester coating fragments is placed on one side of the cooling conveyor belt, and the collection box is located directly below the discharge port. A dust removal unit is installed at the discharge port.

[0008] A pipe is installed around the discharge port, an air inlet is opened on the side wall of the pipe, the air inlet surrounds the entire discharge port, the outer wall of the inner ring of the pipe is vertically flush with the inner wall of the discharge port, a negative pressure pipe is connected to the side wall of the pipe, and an adjustment unit is installed in the pipe. Under the action of the adjustment unit, the dust removal unit can suck air in any horizontal direction of the discharge port with the same suction force.

[0009] Before the production of epoxy polyester powder coating, the staff will weigh the various ingredients of epoxy polyester powder coating in proportion, put the ingredients into the mixer to mix evenly, and then put the mixed ingredients into the melt extruder for mixing. The material extruded by the melt extruder is squeezed into tablets through the cooling roller. In order to prevent the extruded material from continuing to react, the cooling conveyor belt will cool the tablets to below 35°C when transporting them to the crusher. The tablets are broken into fragments of about 1cm×5cm×5cm by the crusher.

[0010] When the crusher crushes the tablets, it will produce fine powder. These powders will not fall into the collection box, but will float in the air. If these dusts are inhaled for a long time, it will easily cause pneumoconiosis to the workers. Therefore, the national air quality standard stipulates the size and concentration of the diameter of the particles in the air. In particular, the PM2.5 value is 35-75μg / m 3 . That is, the content of particles below 2.5μm in good-grade air is 35-75μg per cubic meter. Existing crushers will be equipped with a suction port at the discharge port to suck away the air near the discharge port and the dust in the air to prevent the dust from floating everywhere. However, since the crusher outlet and the collection box are completely open, the dust removal effect will only be better near the suction port, and some dust will still float into the air, endangering the workers. If the suction force at the suction port is increased, the effective coverage area will be larger, which can solve this problem. However, the greater suction force will affect the falling trajectory of the tablet fragments, so that the fragments will not fall into the collection box, and may even be sucked into the suction port. If the fragments block the suction port, the suction port will fail.

[0011] Therefore, the present invention installs a dust removal unit around the discharge port. Since the dust removal unit is arranged in a surrounding manner, it will generate suction in any horizontal direction of the discharge port, avoiding the existing situation where there is only one suction port, resulting in poor dust removal effect at the discharge port.

[0012] Preferably, the air inlet is located at the bottom of the pipe.

[0013] When the crusher is started, the negative pressure machine is started simultaneously. The negative pressure machine creates a negative pressure state in the pipe through the negative pressure pipe. Therefore, the outside air will enter the pipe from the air inlet, and the dust in the air will also enter the pipe. In order to prevent the pipe from blocking the falling of the fragments, the outer wall of the inner ring of the pipe and the inner wall of the discharge port are set to be vertically flush. The air outlet is set at the bottom of the pipe in the vertical direction. Therefore, when the fragments fall to the front of the air inlet, they will not be pulled by the horizontal upward force, so the falling trajectory of the fragments will not be affected. When the fragments fall to the air inlet, the angle between the suction force of the air inlet and the gravity of the fragments will be large. In addition, the previous vertical downward movement has made the movement speed of the fragments very fast. Therefore, compared with the existing method that affects the movement direction of the fragments when the fragments just start to fall, the present invention will have little effect on the falling of the fragments. Therefore, the present invention can use a greater suction force to increase the dust collection effect.

[0014] After stopping production, the staff can turn off the negative pressure machine 4-5 minutes later to ensure that most of the dust is sucked away by the dust removal unit to prevent dust from floating in the air.

[0015] Preferably, a baffle is vertically fixedly installed at the edge of the air inlet close to the outer circle of the pipe, and the baffle is used to adjust the air intake direction of the air inlet.

[0016] Since dust is generated within the crusher, to improve the dust removal efficiency of the dust removal unit, the air drawn into the air inlet should originate more from the space enclosed by the discharge port and the duct, reducing air drawn in from other directions. Therefore, the present invention incorporates a vertically fixed baffle at the edge of the air inlet near the outer circumference of the duct, creating a height difference between the inner and outer circumferences of the air inlet. This increases the amount of air drawn from below the duct and within the baffle, thereby enhancing the dust removal efficiency of the dust removal unit. The baffle also prevents some debris from being dragged by the airflow and redirected to fall outside the collection bin. Because the baffle is positioned vertically, debris moving diagonally downward and colliding with the baffle will be redirected to vertical downward movement. Furthermore, as air from the discharge port is continuously drawn away, a suction force toward the discharge port is generated at the crusher's feed port. As the tablets are crushed, some of the tablet fragments may remain at the feed port due to the crusher's lack of a guide device. When excessive fragments accumulate, they may fall onto the cooling conveyor and ultimately onto the ground, resulting in material waste. The present invention generates suction at the feed port, so that the fragments can enter the crusher more easily when they are generated, and then be discharged from the discharge port.

[0017] Furthermore, the baffle can be set to be inclined toward the center of the pipe to form a funnel shape. Although this will hinder the falling speed of some fragments, the opening at the bottom of the baffle will become smaller, reducing the dust removal unit's absorption of air from the outside and increasing the dust removal unit's absorption of air at the discharge port. At the same time, since the lower end of the baffle is completely smaller than the collection box, most of the fragments can be ensured to fall completely into the collection box. However, some fragments may remain on the inclined surface of the baffle, which may cause serious blockage. Therefore, it is necessary to install a vibration device to make the baffle vibrate intermittently.

[0018] Preferably, the adjustment unit includes a partition fixedly installed horizontally in the middle of the inner side of the pipe, a plurality of through holes are opened on the partition, and a spring is installed on the side of the through hole close to the air inlet to adjust the air suction volume of the through hole according to the suction force. The connection between the negative pressure tube and the pipe is located above the partition, and an anti-blocking unit cooperating with the cooling conveyor belt is installed on the outer top wall of the pipe, and the anti-blocking unit is used to prevent the pipe from being blocked by dust.

[0019] When the negative pressure machine starts working, the negative pressure pipe will form a negative pressure state in the space above the partition in the pipe, so outside air will be replenished into the pipe from the through hole. Normally, the closer the through hole is to the negative pressure pipe, the stronger the suction force will be, so more air will approach this place, and the air pressure formed will press the reed to deform and move closer to the through hole. The approach of the reed reduces the distance between the reed and the through hole, so the amount of air inhaled will decrease. In order to ensure the stability of the air pressure in the space formed by the pipe and the partition, the pipe will absorb more air from other through holes far away from the negative pressure pipe, so The suction force of the through holes close to the negative pressure tube decreases, while the suction force of the through holes far from the negative pressure tube increases. Through the action of the reed, the suction force of all the through holes is roughly equal. The dust removal unit has the same suction force in any direction on the horizontal plane of the discharge port. Therefore, the present invention will not have a situation where the suction force in a single direction is too large and affects the falling of fragments. At the same time, since the suction force is evenly distributed, the present invention can increase the suction force of the negative pressure tube without interfering with the falling of fragments compared to the prior art. This is equivalent to installing the suction port of the prior art in any direction on the horizontal plane of the discharge port, thereby improving the dust removal effect.

[0020] The reed will return to its initial state after the vacuum machine stops working, and will not resume adjustment until the next time the vacuum machine starts working. Therefore, the adjustment unit of the present invention requires a certain amount of time to adjust the suction force at each through-hole to be equal. Therefore, the present invention needs to start 2-3 minutes before the epoxy polyester powder coating production to ensure the dust removal effect.

[0021] In addition to using reeds, the adjustment unit can also adjust the size of the holes on the partition to achieve balance. The holes closer to the negative pressure tube have smaller diameters. A smaller diameter results in less air passing through per unit time. Therefore, to maintain the air pressure in the pipeline, the air intake of the remaining holes farther away from the negative pressure tube will increase, thereby achieving balanced regulation. However, adjusting the air intake volume at various points in the pipeline by changing the size of the holes requires extensive experimentation to determine the appropriate aperture size and gradient. Using reeds does not require extensive experimentation, but reeds will wear out after repeated use, requiring regular maintenance and replacement.

[0022] Preferably, the side of the partition away from the reed is set as an inclined surface to facilitate the movement of dust in the pipeline. The farthest path of the partition from the negative pressure pipe is the highest point of the inclined surface, and the lowest point of the inclined surface is located at the partition closest to the negative pressure pipe.

[0023] In order to prevent dust from falling onto the partition and accumulating during its movement in the pipe, or even causing blockage, the present invention provides an inclined surface on the side of the partition away from the spring. The point of the partition farthest from the negative pressure pipe is the highest point of the inclined surface. The inclined surface begins to slope from the highest point to both sides. The lowest point of the inclined surface is located at the part of the partition closest to the negative pressure pipe. This arrangement facilitates the movement of airflow. At the same time, when dust falls onto the inclined surface, the component force generated by its gravity will give it a tendency to move downward along the inclined surface, making it easier for the dust to move under the influence of the airflow and eventually enter the negative pressure pipe.

[0024] Preferably, the corners of the inner side wall of the pipe are rounded.

[0025] Rounded corners can reduce the resistance of airflow when it moves through the corners in the pipe, preventing dust from falling onto the partitions and accumulating due to the reduction of airflow. At the same time, if the corners are sharp, some dust will accumulate at the angle formed by the side walls when passing through the corners. Long-term accumulation may cause pipe blockage, but rounded corners will not cause this problem.

[0026] Preferably, the anti-blocking unit includes a plurality of elastic rods vertically fixedly mounted on the top wall outside the pipeline, and fixed blocks cooperating with the elastic rods are fixedly mounted on the ends on both sides of the forward direction of the cooling conveyor belt.

[0027] An elastic rod is vertically fixed to the outer wall of the duct. When the cooling belt runs, the fixed blocks attached to the links at both ends of the cooling belt strike the rod, causing it to deform elastically. As the cooling belt moves, the fixed blocks separate from the rod. Without the fixed blocks, the rod returns to its original position. This recovery causes the rod to shake and vibrate the duct. This vibration prevents dust from accumulating inside, ensuring the dust removal unit's effectiveness. The elastic rod should be made of a material with strong elastic deformation, such as rubber or spring steel.

[0028] Furthermore, since the pipeline will generate vibration, the connection between the pipeline and the discharge port and the installation of crusher parts need to adopt anti-loosening connections, such as using spring washers, Nord-Lock washers and Spirax washers.

[0029] A production process of epoxy polyester powder coating:

[0030] S1: Weigh the various ingredients of epoxy polyester powder coating according to the proportion, put the ingredients into the mixer and mix them evenly;

[0031] S2: The mixed ingredients are put into a melt extruder for mixing. The material extruded by the melt extruder is squeezed into a tablet through a cooling roller. The cooling conveyor belt cools the tablet to below 35°C during the conveying process to the crusher. The tablet is crushed into fragments of about 1cm×5cm×5cm by the crusher. The dust removal unit at the crusher outlet cooperates with the adjustment unit to generate suction in any horizontal direction of the outlet, and the suction force is at the upper limit value, so that the dust cannot spread.

[0032] S3: The collected fragments are put into an air classifying mill (ACM mill) for fine grinding. The finely ground powder is screened by a sifter and the 180-200 mesh powder is packaged in double plastic bags.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. In the existing epoxy polyester powder coating production process, it is necessary to efficiently suck away the dust generated in the process to prevent the dust from spreading in the workshop and affecting the safety of the epoxy polyester powder coating production process. Therefore, the present invention cooperates with the dust removal unit and the adjustment unit, so that the dust removal unit has equal suction force in any direction of the horizontal plane at the dust generation location and the suction force is the upper limit value, which is equivalent to installing the existing dust removal unit around the dust generation location, thereby improving the dust removal efficiency, increasing the safety of the epoxy polyester powder coating production process, and preventing the staff from being harmed by dust when performing the epoxy polyester powder coating production process for a long time.

[0035] 2. Compared to existing dust removal units, this system utilizes a duct mounted around the discharge port, with an air inlet located at the bottom. This creates a vertical suction force that does not affect the falling of debris, preventing it from falling outside the collection box. Therefore, the present invention can remove over 90% of the dust generated by the crusher without affecting production, increasing crusher safety and protecting workers from dust hazards.

[0036] 3. A baffle is vertically mounted on the outer ring of the duct air inlet, creating a height difference between the inner and outer rings of the air inlet. This baffle increases the amount of air absorbed by the baffle, thereby enhancing the dust removal efficiency of the dust removal unit of the present invention. Simultaneously, as air from the discharge port is continuously drawn away, a suction force is generated at the crusher feed port toward the discharge port, allowing generated debris to more easily enter the crusher and be discharged from the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the overall structure of the pipeline of the present invention;

[0039] Figure 3 for Figure 2 Middle AA section view;

[0040] Figure 4 for Figure 3 Middle BB cross-section;

[0041] Figure 5 for Figure 3 Middle CC section view;

[0042] Figure 6 This is a schematic structural diagram of the anti-blocking unit of the present invention;

[0043] Figure 7 This is a comparison diagram of the baffle effect of the present invention.

[0044] In the figure: 1. Cooling conveyor belt; 2. Crusher; 3. Collection box; 4. Pipe; 5. Air inlet; 6. Negative pressure pipe; 7. Baffle; 8. Partition; 801. Highest point; 802. Lowest point; 9. Through hole; 10. Reed; 11. Elastic rod; 12. Fixing block. DETAILED DESCRIPTION

[0045] The following will be combined with the appended Figures 1 to 7 , clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments of the present invention include but are not limited to the embodiments described below. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] The terms "first" and "second" appearing in this application are used solely for the purpose of describing the order of objects, and are not intended to indicate relative importance or to specify the quantity of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of the aforementioned features. The term "plurality" used in this application means at least two.

[0047] A production process of epoxy polyester powder coating:

[0048] S1: Weigh the various ingredients of epoxy polyester powder coating according to the proportion, put the ingredients into SYH-15 three-dimensional motion mixer and mix them for 2 hours to make the ingredients uniform to 99%;

[0049] S2: The mixed ingredients are put into a single-screw 45-type melt extruder for mixing. The material extruded by the single-screw 45-type melt extruder is squeezed into a sheet through a cooling roller. The cooling conveyor belt 1 cools the sheet to 33°C during the process of transporting the sheet to the gear crusher 2. The sheet is broken into pieces of about 1cm×5cm×5cm by the gear crusher 2. The dust removal unit at the discharge port of the gear crusher 2, in cooperation with the adjustment unit, generates suction in any horizontal direction of the discharge port, and the suction force is at the upper limit, so that the dust cannot spread. At the same time, the dust removal rate reaches 97%, making the PM2.5 value in the workshop 24μg / m 3 ;

[0050] S3: The collected fragments are placed in an air classifying mill (ACM mill) for fine grinding for 0.5 hours. The finely ground powder is screened by a vibrating screener and the 180-200 mesh powder is packaged in double plastic bags.

[0051] In the first embodiment, the collection boxes 3 used in production are all of the same type.

[0052] 2-3 minutes before the production of epoxy polyester powder coating, start the negative pressure machine, refer to Figure 4 and Figure 5 , the negative pressure pipe 6 makes the space formed by the pipe 4 and the partition 8 form a negative pressure state. In order to maintain the stability of the air pressure in the pipe 4, the outside air will continue to enter the space formed by the pipe 4 and the partition 8 from the through hole 9. Figure 7 The baffle 7 installed at the air inlet 5 is used to adjust the air suction direction of the air inlet 5. When there is no baffle 7, the air inlet 5 will absorb air from multiple directions. After adding the baffle 7, the air inlet 5 will increase the amount of air absorbed from the vertical direction and the space enclosed by the baffle 7, thereby increasing the dust removal effect. At the beginning, the closer the through hole 9 is to the negative pressure tube 6, the stronger the suction force is, so more air will approach this place, and the air pressure formed will press the reed 10 to deform and move closer to the through hole 9. The approach of the reed 10 reduces the distance between the reed 10 and the through hole 9, so the amount of air inhaled will decrease. In order to ensure the stability of the air pressure in the space formed by the pipe 4 and the partition 8, the pipe 4 will absorb more air from other through holes 9 away from the negative pressure tube 6. Therefore, the suction force of the through holes 9 close to the negative pressure tube 6 is reduced, and the suction force of the through holes 9 away from the negative pressure tube 6 is increased. Under the action of the reed 10, the suction force of all the through holes 9 is roughly equal, and the power of the negative compressor can be adjusted according to actual conditions, so that the suction force at each point of the pipe 4 is equal to the suction force of the existing air intake, thereby increasing the dust removal effect.

[0053] refer to Figure 1 and Figure 2During production, the cooling conveyor belt 1 will feed the pressed tablets into the crusher 2. When the cooling conveyor belt drives the pressed tablets forward, the fixed blocks 12 connected at both ends of the cooling conveyor belt 1 will hit the elastic rod 11, causing the elastic rod 11 to undergo 30° elastic deformation. The elastic rod 11 here is made of a material with strong elastic deformation ability, such as rubber, spring steel, etc. The fixed block 12 will separate from the elastic rod 11 as the cooling conveyor belt 1 moves. At this time, due to the lack of the fixed block 12, the elastic rod 11 will return to its current state. While recovering, the elastic rod 11 will shake and drive the pipe 4 to vibrate. The vibration of the pipe 4 can prevent dust from accumulating inside it, and will also cause the dust attached to the inner wall of the pipe 4 and the partition 8 to fall off. In order to facilitate the cleaning and maintenance of the pipe 4 during subsequent use, the pipe 4 should be installed at the discharge port of the crusher 2 using a detachable connection, such as a bolt connection. However, since the elastic rod 11 causes the entire pipe 4 to vibrate, general detachable connections are prone to loosening under a vibrating environment, so anti-loosening connections are required, such as spring washers, Nord-Lock washers, and Spiralock washers. After the epoxy polyester tablets enter the crusher 2, they will be broken into pieces under the action of the crusher 2, and a large amount of fine dust will be generated. The fragments will leave the crusher 2 from the discharge port and finally fall into the collection box 3. The dust will enter the air inlet 5 of the pipe 4 under the action of the flowing air, and then enter the space formed by the pipe 4 and the partition 8 from the through hole 9. When the dust moves in the space, some of it will inevitably fall on the partition 8. In order to prevent the dust from accumulating on the partition 8 and forming a blockage, an inclined surface is set on the side of the partition 8 away from the spring 10. Figures 3 to 5 The highest point 801 of the partition 8 is where it is farthest from the negative pressure pipe 6 along the pipe 4, and the lowest point 802 is where the partition 8 is closest to the negative pressure pipe 6. The force generated by the gravity of the dust falling on the inclined surface will give it a tendency to move downward along the inclined surface, making it easier for the dust to move under the influence of the airflow. At the same time, the corners of the pipe 4 are set to be rounded to prevent dust from accumulating at the angle of the inner wall of the pipe 4. The dust in the pipe 4 will eventually enter the negative pressure pipe 6 and be collected. In order to facilitate the subsequent cleaning of the pipe 4, one of the side walls of the pipe 4 can be set to be detachable, and the pipe 4 can be cleaned regularly. The inner wall of the pipe 4 with a rounded corner is easier to clean. When the collecting box 3 is full, the staff can stop starting the cooling conveyor belt 1 and the single screw 45 type melt extruder and replace the collecting box 3, but the negative pressure machine cannot be turned off at this time to prevent the dust that has not been sucked into the pipeline from spreading. After replacing the collecting box 3, the staff restarts the cooling conveyor belt 1 and the single screw 45 type melt extruder.

[0054] The staff can only turn off the negative pressure machine 4 minutes after stopping production to ensure that 97% of the dust is sucked away by the dust removal unit to prevent the dust from floating in the air.

[0055] Embodiment 2: When the collection boxes 3 used in production have multiple styles with unequal heights.

[0056] When faced with collection boxes 3 of different heights, a height adjustment unit can be added so that the height of the pipe 4 can be adjusted according to the height of the collection box 3. Because the closer the baffle 7 is to the collection box 3, a relatively closed space will be formed between the baffle 7 and the collection box 3, and the dust removal effect will be better at this time. The height adjustment unit can use a device that can adjust the length at will, such as a hydraulic cylinder, an electric push rod, etc. Here, a hydraulic cylinder is taken as an example. Multiple hydraulic cylinders are evenly fixed and installed at the discharge port, and the output end of the hydraulic cylinder is located in a vertically downward direction. The output end of the hydraulic cylinder is fixedly connected to the top of the pipe 4. A foldable tape is connected between the discharge port and the pipe 4. The tape completely surrounds the hydraulic cylinder, so that debris and dust can only pass through the pipe 4 in the end, preventing dust from floating everywhere. According to the different heights of the collection boxes 3, the staff can start the hydraulic cylinder to drive the pipe 4 up and down to adapt and adjust. It is best when the pipe 4 is less than 30 cm away from the collection box 3.

[0057] In the third embodiment, when the through holes 9 of different sizes are used to adjust the balance of air intake at various locations of the pipeline 4 .

[0058] The aperture sizes of the through holes 9 on the partition 8 from the lowest point 802 to the highest point 801 are set in an arithmetically increasing manner. The closer the through holes 9 are to the negative pressure tube 6, the smaller the diameter is. Therefore, the amount of air passing through the through holes 9 near the negative pressure tube 6 per unit time is reduced. Therefore, in order to ensure the stability of the air pressure in the pipeline 4, the air intake of the remaining through holes 9 away from the negative pressure tube 6 will increase, thereby achieving balanced regulation of all through holes 9. However, using the size of the through holes 9 to adjust the air intake at various locations in the pipeline 4 requires a lot of experimentation to determine a reasonable aperture size and gradient. Using the reed 10 does not require a lot of experimentation, but the reed 10 will be damaged after repeated use, and therefore requires regular maintenance and replacement.

[0059] Although a number of embodiments of the present invention have been enumerated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the states and components of these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An epoxy polyester powder coating production equipment, comprising: A cooling conveyor belt (1) is used to cool epoxy polyester tablets to below 35° C. A crusher (2) is installed at the end of the cooling conveyor belt (1) in the feeding direction. The crusher (2) is used to crush the epoxy polyester tablets into fragments. The crusher (2) is provided with a discharge port, and the discharge port is directed vertically downward. A collection box (3) for containing epoxy polyester coating fragments is placed on one side of the cooling conveyor belt (1), and the collection box (3) is located directly below the discharge port. A dust removal unit is installed at the discharge port. The invention is characterized in that: a pipe (4) is installed around the discharge port, an air inlet (5) is opened on the side wall of the pipe (4), the air inlet (5) surrounds the entire discharge port, the outer wall of the inner ring of the pipe (4) is vertically flush with the inner wall of the discharge port, a negative pressure pipe (6) is connected to the side wall of the pipe (4), an adjustment unit is installed in the pipe (4), and the dust removal unit, under the action of the adjustment unit, allows the dust removal unit to suck air in any horizontal direction of the discharge port with the same suction force; The regulating unit comprises a partition (8) fixedly mounted horizontally on the middle of the inner side of the pipe (4), a plurality of through holes (9) are provided on the partition (8), a spring (10) for adjusting the air intake volume of the through hole (9) according to the suction force is installed on the side of the through hole (9) close to the air inlet (5), the connection between the negative pressure pipe (6) and the pipe (4) is located above the partition (8), and an anti-blocking unit cooperating with the cooling conveyor belt (1) is installed on the outer top wall of the pipe (4), and the anti-blocking unit is used to prevent the pipe (4) from being blocked by dust; The negative pressure pipe (6) will cause the space above the partition (8) in the pipeline (4) to form a negative pressure state. The air pressure formed will compress the reed (10) to deform and move closer to the through hole (9). The approach of the reed (10) reduces the distance between the reed (10) and the through hole (9), so the amount of air sucked in will be reduced. Under the action of the reed (10), the suction force of all the through holes (9) is roughly equal, and the dust removal unit has the same suction force in any direction on the horizontal plane of the discharge port.

2. The epoxy polyester powder coating production equipment according to claim 1, characterized in that: The air inlet (5) is located at the bottom of the pipeline (4).

3. The epoxy polyester powder coating production equipment according to claim 2, characterized in that: A baffle (7) is vertically fixedly installed at the edge of the air inlet (5) close to the outer circle of the pipe (4), and the baffle (7) is used to adjust the air intake direction of the air inlet (5).

4. The epoxy polyester powder coating production equipment according to claim 1, characterized in that: The side of the partition (8) away from the reed (10) is set as an inclined surface to facilitate the movement of dust in the pipe (4); the farthest distance between the partition (8) and the negative pressure pipe (6) is the highest point (801) of the inclined surface, and the lowest point (802) of the inclined surface is located at the partition (8) closest to the negative pressure pipe (6).

5. The epoxy polyester powder coating production equipment according to claim 1, characterized in that: The corners of the inner side wall of the pipe (4) are rounded.

6. The epoxy polyester powder coating production equipment according to claim 1, characterized in that: The anti-blocking unit comprises a plurality of elastic rods (11) vertically fixedly mounted on the outer top wall of the pipe (4), and fixed blocks (12) cooperating with the elastic rods (11) are fixedly mounted on the ends of both sides of the forward direction of the cooling conveyor belt (1).

7. A production process for the epoxy polyester powder coating production equipment according to any one of claims 1 to 6, characterized in that: S1: Weigh the various ingredients of epoxy polyester powder coating according to the proportion, put the ingredients into the mixer and mix them evenly; S2: The mixed ingredients are put into a melt extruder for mixing. The material extruded by the melt extruder is squeezed into a tablet through a cooling roller. The cooling conveyor belt transports the tablet to the crusher (2) and cools the tablet to below 35°C. The tablet is crushed into pieces of about 1cm×5cm×5cm by the crusher (2). The dust removal unit at the discharge port of the crusher (2) absorbs the dust generated when the tablet is crushed; S3: The collected fragments are put into the air classifying mill for fine grinding. The finely ground powder is screened by a sifter and the 180-200 mesh powder is packaged in double plastic bags.

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