A hot air circulation drying equipment for polyester resin coating production

Abstract

The application relates to the technical field of powder drying, and discloses a hot air circulation drying equipment for polyester resin paint production, which aims to solve the problem of uneven heating during polyester resin paint drying, and the air flow blown by a fan is heated by a heater, the hot air flow is directly delivered to the inside of a drying pipe, and the powder paint in the inside of the drying pipe is subjected to contact drying, the air flow output from the inside of the drying pipe is returned to the fan, air flow circulation is realized, the air flow output from the drying pipe is heated again, and air flow waste heat loss is reduced; meanwhile, filter plates are arranged at the two ends of the drying pipe, the filter plates are used for filtering to prevent the powder in the inside of the drying pipe from being input into the fan along with the air flow, when the filter plates are blocked, the fan is reversely rotated, the air flow direction in the inside of the drying pipe is changed, the powder drying is ensured, the filter plates are subjected to air flow back flushing to unblock, and finally, the effect of air flow circulation and uniform heating of the powder paint is realized.

Description

Technical Field

[0001] This application relates to the field of powder drying technology, and in particular to a hot air circulating drying device for the production of polyester resin coatings. Background Technology

[0002] Polyester resin coatings are coatings that use polyester resin as the main film-forming substance, formed by the condensation polymerization of polyols and polyacids. Due to their excellent properties, polyester resin coatings are widely used in construction, automobiles, furniture, electrical appliances, pipelines, and other fields.

[0003] Traditional methods for drying polyester resin coatings primarily rely on a simple heating tube baking technique. Specifically, this involves placing powdered polyester resin coating in a drying tube and then heating the outer wall of the tube using an external heat source. This heating method aims to conduct heat through the tube wall to the interior, thereby drying the powder coating. However, in practical applications, this drying method suffers from significant heating unevenness. Due to differences in the path and speed of heat transfer, material close to the tube wall is more susceptible to heat and therefore dries more easily than material in the inner layers of the tube. This uneven heating often leads to over-drying, even scorching, of the material near the tube wall, while the material in the middle of the tube may remain undried or semi-dry. This uneven heating not only affects the efficiency of coating drying but can also adversely impact the quality and performance of the coating. Summary of the Invention

[0004] This application proposes a hot air circulating drying device for the production of polyester resin coatings, which has the advantage of uniform drying and solves the problem of uneven heating during the drying of polyester resin coatings mentioned in the background art.

[0005] To achieve the above objectives, this application adopts the following technical solution: a hot air circulating drying device for polyester resin coating production, comprising: a support base, a drying pipe installed in the middle via a bearing seat, a drive motor fixedly connected to the top, and a control main board fixed to the surface; a fan connected to the shaft of the drive motor, with its inlet / outlet connected to a heater; the heater connected to the drying pipe; and achieving airflow circulation.

[0006] Furthermore, it also includes: a drive gear, fixed on the output shaft of the drive motor, meshing with a spherical gear rack fixedly connected to the outside of the drying tube; and a turning bar, fixed on the inside of the drying tube.

[0007] Furthermore, filter plates are fitted onto both ends of the drying tube, and a connecting tube is movably fitted onto the middle of the filter plate. Nuts are threaded onto the connecting tube to clamp and fix the filter plate, and filter holes are opened on the surface of the filter plate.

[0008] Furthermore, it also includes: an air supply box, connected to the heater, symmetrically arranged on the top of the support base; an adjusting box, movably connected to the drying pipe, and the adjusting box and the drying pipe are connected; a telescopic pipe, with its top end connected to the air supply box and its bottom end connected to the adjusting box, for communication between the air supply box and the adjusting box; and a reversing switch, fixedly connected to the surface of the adjusting box.

[0009] Furthermore, the spherical toothed rack has an arc shape, and the center point of the spherical toothed rack is located on the rotation center line between the drying tube and the support base.

[0010] Furthermore, a material control sleeve is movably fitted on one side of the drying tube. The material control sleeve is fixed on the adjusting air box. Feed baffles and discharge baffles are symmetrically arranged on the side of the material control sleeve, and both feed baffles and discharge baffles are threaded onto the material control sleeve.

[0011] Furthermore, it also includes: a reversing rod, the top of which is fixedly connected to the air supply box, the bottom of which is located on one side of the filter plate, and the bottom is fixedly connected to symmetrically arranged upper limit blocks and lower limit blocks; an adjusting frame, one end of which is movably mounted on the reversing rod, and the other end is threadedly connected to an adjusting cylinder, and the other end is fitted onto a connecting pipe, and the outer side of the other end is connected to a cleaning disc via a bearing; a cleaning column, fixed on the surface of the cleaning disc, used to clean the filter holes; an anti-detachment column, fixed on the surface of the cleaning disc, used to guide the cleaning column when it is inserted into the filter hole; and a limiting spring, one end of which is connected to the adjusting frame, and the other end of which is connected to the reversing rod.

[0012] Furthermore, a pressure relief valve is installed on the bellows.

[0013] Furthermore, it also includes: a limiting rod, movably mounted at the end of the adjusting cylinder, and a limiting spring 2 connected between the limiting rod and the adjusting frame; a transmission sleeve, fixedly connected to the end of the limiting rod, for synchronous movement of the two limiting rods; a one-way toothed rack, fixed on the lower limit block; and a reset slider, slidably mounted on the upper limit block.

[0014] Furthermore, the bottom of the reset slider is sloped, and the sides are arc-shaped.

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

[0016] This application provides a hot air circulating drying device for the production of polyester resin coatings. A heater heats the airflow blown out by a fan to a suitable temperature, forming a hot airflow. This hot airflow is then directly transported into the interior of the drying tube, where it comes into full contact with the polyester resin powder coating, thereby achieving the drying of the coating.

[0017] After the airflow completes its drying process, the airflow exiting the drying tube is not directly discharged to the outside. Instead, it returns to the fan through a designed circulation channel. This design not only achieves airflow recycling but also significantly reduces waste heat loss and improves energy efficiency by reheating the airflow exiting the drying tube.

[0018] In addition, to prevent powder coating from entering the blower through the airflow inside the drying tube, filter plates are installed at both ends of the drying tube. These filter plates effectively filter powder particles in the airflow, ensuring the normal operation of the blower. Simultaneously, when the filter plates become clogged due to prolonged use, the equipment automatically triggers a reverse rotation mechanism. After the blower reverses its rotation, the airflow direction inside the drying tube changes accordingly, backflushing and clearing the filter plates. This process not only ensures the continuous drying of the powder coating but also effectively removes the blockage from the filter plates, maintaining smooth airflow circulation.

[0019] In summary, this hot air circulating drying equipment for polyester resin coating production, through ingenious design and optimization, achieves the effect of uniform heating of powder coatings through airflow circulation, providing an efficient and energy-saving solution for the drying process in coating production. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0021] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0022] Figure 1 This is a schematic diagram of the overall external three-dimensional structure;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the power unit;

[0024] Figure 3 This is a schematic diagram of the overall frontal sectional structure;

[0025] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the drying tube;

[0026] Figure 5 A schematic diagram showing the placement of each part after the adjustment frame is installed;

[0027] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the regulating cylinder;

[0028] Figure 7 A schematic diagram showing the locations of various components installed on the bottom of the commutator;

[0029] Figure 8 This is a schematic diagram of the end plane of the reset slider;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the blockage clearing disc.

[0031] In the diagram: 1. Support base; 100. Control main board; 2. Drive motor; 3. Fan; 300. Heater; 4. Drive gear; 5. Air supply box; 6. Telescopic pipe; 7. Reversing switch; 8. Adjusting air box; 9. Drying pipe; 900. Tilting bar; 901. Bearing seat; 10. Spherical toothed rack; 11. Material control sleeve; 110. Feed baffle; 111. Discharge baffle; 12. Pressure relief valve; 13. Reversing rod; 14. Upper limit block; 140. Reset slider; 15. Lower limit block; 150. One-way toothed rack; 16. Filter plate; 17. Unblocking disc; 170. Unblocking column; 171. Anti-detachment column; 18. Adjusting frame; 19. Limiting spring one; 20. Adjusting cylinder; 21. Transmission sleeve; 22. Connecting pipe; 23. Limiting top rod; 230. Limiting spring two. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example 1

[0033] Please see Figure 1 It is evident that the support base 1 has a drying tube 9 defined by a bearing housing 901 in the middle. The top of the support base 1 has a drive motor 2 fixedly connected by bolts, and a fan 3 is fixedly connected to the shaft of the drive motor 2. The direction of the airflow output by the fan 3 changes according to the forward / reverse rotation of the drive motor 2. A heater 300 is connected to the inlet / outlet of the fan 3. When the heater 300 is powered on, it heats the airflow output by the fan 3. The inlet / outlet of the heater 300 is connected to both ends of the drying tube 9 via pipes. The speed and direction of rotation of the drive motor 2, as well as the temperature of the heater 300, are controlled by a control board 100 fixed to the surface of the support base 1. Figure 4 As can be seen, the drying tube 9 is an internally continuous cylinder used to hold polyester resin powder.

[0034] In practical applications, the powder coating is placed into the drying tube 9. The control board 100 controls the drive motor 2 to rotate and adjusts the heater 300 to heat to the required temperature. When the fan 3 inputs airflow from the heater 300 into the drying tube 9, the hot airflow generated by the heater 300 enters the inner cavity of the drying tube 9, thereby drying the powder coating inside the drying tube 9. The airflow output from the drying tube 9 eventually returns to the fan 3. Since the temperature of the airflow output from the drying tube 9 is still higher than the outside air temperature, the hotter airflow is reheated by the heater 300, allowing the airflow to heat up more quickly and thus reducing heat loss.

[0035] Regarding how the powder coating is input / output from the drying tube 9, based on the first embodiment, the powder coating can be directly input / output from any end opening of the drying tube 9.

[0036] Because the powder coating accumulated inside the drying tube 9 is prone to uneven heating, in order to address this problem, combined with... Figure 2 It can be seen that a drive gear 4 is fixedly installed on one side of the fan 3 via the output shaft of the drive motor 2, and a spherical gear rack 10 that meshes with the drive gear 4 is fixedly connected to the outside of the drying tube 9. Therefore, when the drive motor 2 drives the fan 3 and the drive gear 4 to rotate synchronously, the drive gear 4 will cause the drying tube 9 to rotate synchronously, thereby causing the powder coating in the inner cavity of the drying tube 9 to tumble, ensuring uniform contact between the powder coating and the airflow. Figure 4 It can be clearly seen that multiple material-turning strips 900 are fixedly connected to the inner side of the drying tube 9, and the multiple material-turning strips 900 are arranged at equal angles on the inner wall of the drying tube 9. Thus, when the drying tube 9 rotates, the material-turning strips 900 are used to spray the powder coating, thereby achieving uniform contact between the powder coating and the hot airflow. Example 2

[0037] For further improvements based on Example 1, please refer to [link / reference]. Figure 3 and Figure 4 It is evident that filter plates 16 are fitted onto both ends of the drying tube 9, and a connecting tube 22 is movably fitted onto the middle of the filter plate 16. Two nuts are used to install the filter plates 16 at both ends of the drying tube 9, thereby clamping the filter plates 16 and ensuring that they do not detach from the drying tube 9. Figure 4 It can be clearly seen that multiple filter holes are provided on the surface of the filter plate 16 to filter the powder coating in the inner cavity of the drying tube 9, thereby preventing the coating in the inner cavity of the drying tube 9 from flowing directly into the fan 3 through the airflow.

[0038] Since the filter plate 16 filters through filter holes, in practical applications, airflow may be obstructed due to clogging of the filter holes. To address this problem in this second embodiment, based on the above description, air supply boxes 5 are symmetrically arranged on the top of the support base 1 on both sides of the heater 300. The two air supply boxes 5 are respectively connected to the inlet / outlet of the heater 300. The bottom of the air supply boxes 5 has a telescopic pipe 6 fixed by a flange connection. The telescopic pipe 6 is preferably a corrugated pipe. Figure 1 and Figure 3 It can be seen that the bottom end of the telescopic pipe 6 has an adjusting air box 8 fixedly connected by a flange. The side of the adjusting air box 8 is movably connected to the end of the drying pipe 9, thereby realizing the communication between the inner cavities of the adjusting air box 8 and the drying pipe 9. In order to prevent the adjusting air box 8 from rotating with the drying pipe 9, combined with... Figure 1 As can be seen, the surface of the adjusting air box 8 has a cylindrical tube connected by a ball, and the cylindrical tube is inserted into the positioning guide post on the outside of the air supply air box 5. The guide post can rotate on the air supply air box 5. Thus, through the restriction of the cylindrical tube and the positioning guide post, the adjusting air box 8 and the air supply air box 5 can move relative to each other, but the adjusting air box 8 will not rotate with the drying tube 9.

[0039] In the specific implementation process, from Figure 1 and Figure 3 It can be clearly seen that the spherical toothed rack 10 is arc-shaped, and the center point of the spherical toothed rack 10 is located on the rotation center line between the drying tube 9 and the support base 1. Thus, when the drying tube 9 deflects on the support base 1, the drive gear 4 can always maintain meshing transmission with the spherical toothed rack 10.

[0040] When the drive motor 2 drives the fan 3 and the drive gear 4 to rotate, the meshing transmission between the drive gear 4 and the spherical gear set 10 forces the drying tube 9 to rotate synchronously. At the same time, the fan 3 and the heater 300 blow hot air into the drying tube 9 from one end, combined with... Figure 3 In the example of airflow from heater 300 to air supply box 5 on the left, the airflow first enters telescopic pipe 6 and adjusting air box 8 through air supply box 5. After being filtered by filter plate 16 on the left, the airflow is input into the interior of drying pipe 9 and mixed with powder coating that is turned over by turning strip 900 in the inner cavity of drying pipe 9. Finally, the airflow is output from filter plate 16 on the right and returns to fan 3 after passing through adjusting air box 8, telescopic pipe 6 and air supply box 5 on the right.

[0041] As the airflow is output from the filter plate 16 on the right, the filter plate 16 on the right will be blocked, causing poor gas flow until the airflow is completely cut off. As the airflow on the left side of the drying tube 9 increases, the telescopic tube 6 on the left side will tend to extend, while the telescopic tube 6 on the right side will tend to shorten due to the decrease in airflow. Under these conditions, the drying tube 9 will deflect counterclockwise.

[0042] from Figure 1 and Figure 3 It is clearly visible that both adjusting air boxes 8 have reversing switches 7 fixedly connected to their surfaces. When either reversing switch 7 is activated, the drive motor 2 can change its rotation direction under the control of the main control board 100. As mentioned above, when the drying tube 9 continuously rotates counterclockwise, the right reversing switch 7 will gradually approach the air supply box 5 until the air supply box 5 and the reversing switch 7 make contact. Upon receiving the signal, the main control board 100 causes the drive motor 2 to rotate in the opposite direction, thereby causing airflow to enter the heater 300 from the left air supply box 5, pass through the fan 3, and exit into the right air supply box 5. Figure 3 As can be seen, when the filter plate 16 on the right is blocked, the airflow blown from the right-side adjusting air box 8 to the left side of the filter plate 16 impacts the filter holes of the filter plate 16 in the opposite direction, thereby clearing the blockage of the filter plate 16 on the right. Similarly, the filter plate 16 on the left performs filtration. This cycle ensures that the airflow in the drying pipe 9 is evenly circulated to dry the powder coating, while at the same time, by changing the gas flow direction, the blockage of the filter plate 16 is cleared.

[0043] Because the drying tube 9 has too many connecting parts at both ends in this implementation, it is obviously too cumbersome to input / output materials by disassembly. In order to facilitate material input / output, from... Figure 3 and Figure 4 As can be clearly seen, a material control sleeve 11 is movably fitted onto one side of the drying tube 9. The material control sleeve 11 is connected and fixed to the adjusting air box 8. A feed baffle 110 and a discharge baffle 111 are symmetrically arranged on the side of the material control sleeve 11, and both the feed baffle 110 and the discharge baffle 111 are threaded onto the material control sleeve 11. Thus, when the feed baffle 110 is open, the powder coating can be conveyed into the inner cavity of the drying tube 9; similarly, when the discharge baffle 111 is open, the coating in the drying tube 9 is discharged outwards. Therefore, when powder coating needs to be input / output into / out of the inner cavity of the drying tube 9, only the corresponding feed baffle 110 / discharge baffle 111 needs to be opened. Example 3

[0044] For further improvements based on Example 2, please refer to [link / reference]. Figure 3 , Figure 5 , Figure 7 and Figure 9As can be seen, the reversing rod 13 is fixedly connected to the inner side of the air supply box 5, and the bottom of the reversing rod 13 passes through the telescopic pipe 6 and is located in the adjusting air box 8, and is also located on one side of the filter plate 16. The bottom of the reversing rod 13 has an upper limit block 14 and a lower limit block 15 fixedly connected by bolts, and the upper limit block 14 and the lower limit block 15 are symmetrically arranged. The surface shape of the upper limit block 14 and the lower limit block 15 are both right-angled triangles, and the two have the same shape and structure. An adjusting frame 18 is movably installed on the bottom of the reversing rod 13, located on one side of the upper limit block 14 and the lower limit block 15. One end of the adjusting frame 18 is a cuboid, and the other end is a cylinder. The cuboid end of the adjusting frame 18 is threadedly connected to an adjusting cylinder 20 located between the two inclined surfaces of the upper limit block 14 and the lower limit block 15. The cylindrical end is fitted onto the connecting pipe 22, so that the adjusting frame 18 can move axially along the connecting pipe 22. Meanwhile, the outer side of the adjusting frame 18 has a cleaning disc 17 connected by bearings, and the surface of the cleaning disc 17 is fixedly connected with cleaning columns 170 corresponding to the filter holes on the filter plate 16. Furthermore, the surface of the cleaning disc 17 is fixedly connected with an anti-detachment column 171 that penetrates the filter plate 16. The length of the anti-detachment column 171 is 2-4 times the length of the cleaning column 170. Therefore, when the cleaning column 170 detaches from the filter holes on the filter plate 16, the anti-detachment column 171 remains in the filter plate 16, ensuring that when the cleaning disc 17 approaches the filter plate 16 again, the cleaning column 170 can accurately insert into the filter holes in the filter plate 16. Because a limiting spring 19 is provided between the adjusting frame 18 and the reversing rod 13, under the elastic force of the limiting spring 19, the cleaning column 170 on the cleaning disc 17 always tends to insert into the filter holes in the filter plate 16, thereby achieving the cleaning of the filter plate 16.

[0045] Under normal conditions, when powder material is fed into the drying tube 9, before the drive motor 2 is started, the spring force of the limiting spring 19 will force the adjusting frame 18 to move away from the reversing rod 13. Furthermore, as the adjusting frame 18 moves, the unblocking column 170 on the unblocking disc 17 inserts into the filter holes in the filter plate 16, thereby unblocking the filter holes. The adjusting cylinder 20, pulled by the adjusting frame 18, also moves towards the unblocking disc 17 and is restricted by the inclined surfaces of the upper limit block 14 and lower limit block 15, forcing the adjusting cylinder 20 to ultimately be at the bottom of the inclined surfaces of the upper limit block 14 and lower limit block 15. This ensures that, under normal conditions, the drying tube 9 is in a horizontal state due to the restriction of the limiting spring 19.

[0046] When drive motor 2 starts, combined with Figure 3Taking the airflow flowing into the left air supply box 5 as an example, since the filter plate 16 on the left is blocked by the unblocking column 170 at this time, the airflow pressure in the left adjusting air box 8 increases initially, which in turn pushes the left telescopic pipe 6 to extend, forcing the drying pipe 9 to deflect counterclockwise. As the drying pipe 9 rotates continuously and tilts itself, the material in the drying pipe 9 will first accumulate on the left side, thus preventing the filter plate 16 on the right from being blocked directly when the airflow blows towards the filter plate 16 after the material has accumulated.

[0047] As the drying tube 9 continues to deflect, the left regulating cylinder 20 will move downward on the inclined surface of the limit block 15. Similarly, the right regulating cylinder 20 will move upward on the limit block 14. The movement of the regulating cylinder 20 towards the inclined surface forces the regulating frame 18 to squeeze the limiting spring 19, and drives the unblocking column 170 on the unblocking disc 17 to disengage from the filter holes on the filter plate 16, thus enabling airflow to pass through the filter plate 16. However, the anti-disengagement column 171 will not disengage from the filter plate 16. Since the unblocking disc 17 and the regulating frame 18 are connected by a bearing, the unblocking disc 17 can rotate synchronously with the filter plate 16. Furthermore, the deflection of the drying tube 9 at this time will not cause the reversing switch 7 to contact the air supply box 5.

[0048] After prolonged filtration, the filter plate 16 on the right side becomes clogged, forcing the drying tube 9 to deflect further until the reversing switch 7 and the air supply box 5 come into contact, changing the rotation direction of the drive motor 2, achieving the effect described in the above embodiment. When the drive motor 2 stops and begins to move in the reverse direction, the elastic force of the limiting spring 19 will bring the drying tube 9 back to a horizontal state, and the unblocking column 170 will be inserted into the filter plate 16 again to perform unblocking work. When the drive motor 2 rotates in the reverse direction, the airflow is delivered to the air supply box 5 on the right side, and its operation is the same as described above, ultimately achieving the unblocking of the filter plate 16 and reducing the blockage of the filter plate 16.

[0049] In this embodiment, to facilitate unloading, combined with Figure 1 and Figure 3 It is evident that by installing a pressure relief valve 12 on the adjusting air box 8, when unloading is required, the drive motor 2 rotates, causing the airflow to flow into the right-side air supply box 5. Under the action of the airflow, the drying pipe 9 is forced to deflect clockwise, and the material in the drying pipe 9 will also accumulate to the right, making it easier to be discharged from the discharge baffle 111. After the drying pipe 9 deflects, by opening the left-side pressure relief valve 12, the airflow flows from the outside and no longer passes through the drying pipe 9. At this time, the deflected drying pipe 9 will output the material from the discharge baffle 111, and the rotation of the control sleeve 11 driven by the drive gear 4 will accelerate the material output rate. It should be noted that by opening the right-side pressure relief valve 12 and the left-side pressure relief valve 12 at different sizes, the drying pipe 9 can always be in a deflected state when the filter plate 16 is not connected. Example 4

[0050] A further improvement based on Embodiment 3: In Embodiment 3, when the unblocking column 170 detaches from the filter plate 16, it rapidly releases the airflow pressure in the adjusting air box 8. At this time, due to the elastic force of the limiting spring 19, the adjusting cylinder 20 will reset from the inclined surface of the upper limit block 14 or lower limit block 15, causing the unblocking column 170 to re-block the filter plate 16. Therefore, due to the limitation of the elastic force of the limiting spring 19, the filter plate 16 is in a state of intermittent connection / isolation, which is obviously not conducive to the continuous drying of materials. To prevent the adjusting cylinder 20 from uncontrollably resetting from the inclined surface of the upper limit block 14 / lower limit block 15 during operation, combined with... Figure 3 , Figures 5-8 It can be clearly seen that a limiting rod 23 is movably installed at the end of the adjusting cylinder 20, and a limiting spring 230 is connected between the limiting rod 23 and the adjusting frame 18. The elastic force of the limiting spring 230 forces the limiting rod 23 to always tend to push outward. The end of the limiting rod 23 is fixedly connected to a transmission sleeve 21 in the adjusting frame 18. Since the transmission sleeve 21 can extend and retract, and there are two adjusting frames 18, the limiting rods 23 on the two adjusting frames 18 are connected through the transmission sleeve 21. Thus, the transmission of the transmission sleeve 21 forces the limiting rod 23 to extend / retract from the adjusting cylinder 20 synchronously.

[0051] A one-way toothed rack 150 is fixedly connected to the inclined surface of the lower limit block 15. The surface shape of the one-way toothed rack 150 is an isosceles right triangle, so that when the limiting rod 23 moves from the one-way toothed rack 150, it can only move in one direction. (Refer to...) Figure 5 It can be seen that when the adjusting cylinder 20 and the limiting rod 23 move along the inclined surface of the lower limit block 15, they are restricted by the one-way toothed row 150, which prevents the adjusting cylinder 20 from moving to the bottom of the lower limit block 15.

[0052] A reset slider 140 is movably mounted in the inclined surface of the upper limit block 14. Since the upper limit block 14 is installed above the lower limit block 15, under normal conditions, the reset slider 140 will be at the bottom of the inclined surface of the upper limit block 14 due to its own weight. Figure 7 and Figure 8 As can be seen, the bottom of the reset slider 140 is inclined and the side is arc-shaped. When the limiting rod 23 is placed in the arc-shaped surface of the reset slider 140, it will force the limiting rod 23 to disengage from the one-way toothed row 150.

[0053] In practical applications, powdered raw materials are added into the inner cavity of the drying tube 9 after the feed baffle 110 is opened. At this time, under the action of the limiting spring 19, the unblocking column 170 is inserted into the filter hole of the filter plate 16, and the adjusting cylinder 20 is located between the bottom of the inclined surface of the upper limit block 14 and the lower limit block 15.

[0054] Combination Figure 3 Taking the airflow from the blower 3 to the right air box 5 as an example, as the airflow is delivered, the air pressure in the right adjusting air box 8 will increase, which will cause the drying pipe 9 to tend to deflect clockwise. At the same time, when the drying pipe 9 drives the adjusting frame 18 to deflect clockwise, the right adjusting cylinder 20 moves along the inclined surface of the lower limit block 15, and the left adjusting cylinder 20 moves along the inclined surface of the upper limit block 14. At the same time, as the movement occurs, the adjusting frame 18 will be compressed towards the limiting spring 19, which will cause the unblocking disc 17 to drive the unblocking column 170 to gradually detach from the filter holes on the filter plate 16.

[0055] When the right-side adjusting cylinder 20 moves along the lower limit block 15, the limiting rod 23, which is elastically pushed out by the limiting spring 230, will be placed in the one-way toothed row 150, so that the adjusting cylinder 20 cannot move to the bottom of the inclined surface of the lower limit block 15. At the same time, the left-side adjusting cylinder 20 will push the reset slider 140 to move upward along the upper limit block 14 due to the extension of the limiting rod 23. At this time, the limiting rod 23 is pressed against the inclined surface of the reset slider 140.

[0056] As the regulating cylinder 20 moves along the inclined surface of the lower limit block 15 / upper limit block 14 until the unblocking column 170 is completely disengaged from the filter holes on the filter plate 16, the airflow on the right flows into the adjusting air box 8 on the left side of the drying pipe 9 as the filter holes are opened, thereby drying the powder raw materials in the drying pipe 9. Since the limiting rod 23 is pressed against the one-way toothed row 150, it restricts the regulating frame 18 from moving to the bottom of the lower limit block 15, which makes the regulating frame 18 always pull the unblocking column 170 away from the filter holes on the filter plate 16, ensuring continuous airflow.

[0057] During prolonged drying, the filter plate 16 on the left side will be blocked first, which will force the pressure in the adjusting air box 8 on the right side to increase further, thereby causing the drying tube 9 to deflect further. As the drying tube 9 deflects, the reset slider 140 on the left side will rise to the top of the upper limit block 14 and be restricted by the upper limit block 14 and unable to move again. When the adjusting cylinder 20 rises again along the inclined surface of the upper limit block 14, it will force the limiting rod 23 to cross the inclined surface of the reset slider 140 until it moves into the arc of the reset slider 140. At this time, the push from the arc will cause the limiting rod 23 to further press the limiting spring 230, and push the transmission sleeve 21 away from the adjusting cylinder 20 through the limiting rod 23. Due to the transmission of the transmission sleeve 21, the limiting rod 23 on the right side will also move away from the one-way toothed row 150, thereby realizing that the limiting rod 23 on the right side is disengaged from the one-way toothed row 150.

[0058] As the drying tube 9 continues to rotate clockwise, the reversing switch 7 on the left side will contact the air supply box 5, thereby switching the rotation direction of the drive motor 2. Since the one-way gear rack 150 releases the restriction on the limiting rod 23 at this time, under the action of the limiting spring 19, the adjusting cylinder 20 on the right side will be forced to move along the lower limit block 15, thereby causing the drying tube 9 to reset in the horizontal direction. After the reset slider 140 reaches the bottom of the upper limit block 14, the reset of the right adjusting cylinder 20 on the inclined surface of the lower limit block 15 will further force the limiting rod 23 on the left side to disengage from the reset slider 140, so that both adjusting cylinders 20 are between the bottom of the inclined surface of the upper limit block 14 and the lower limit block 15.

[0059] As the rotation direction of the drive motor 2 changes, the airflow will be blown into the left air supply box 5. Similarly, as mentioned above, the drying tube 9 will first deflect counterclockwise and then dry the powder coating again. This cycle is repeated to ensure that the powder coating inside the drying tube 9 is dried evenly.

Claims

1. A hot air circulating drying device for producing polyester resin coatings, characterized in that, include: The support base (1) has a drying tube (9) installed in the middle through a bearing seat (901), a drive motor (2) fixedly connected to the top, and a control board (100) fixed on the surface. The fan (3) is connected to the shaft of the drive motor (2), and its inlet / outlet is connected to the heater (300); The heater (300) is connected to the drying tube (9) to achieve airflow circulation. The drying tube (9) is fitted with filter plates (16) at both ends, and a connecting tube (22) is movably fitted in the middle of the filter plate (16). Nuts are threaded on the connecting tube (22) to clamp and fix the filter plate (16). Filter holes are opened on the surface of the filter plate (16). The air supply box (5) is connected to the heater (300) and is symmetrically arranged on the top of the support base (1); Adjust the air box (8) to be movably connected to the drying pipe (9), and adjust the air box (8) and the drying pipe (9) to be connected; The telescopic pipe (6) is connected at the top to the gas supply box (5) and at the bottom to the adjusting box (8) for connecting the gas supply box (5) and the adjusting box (8); A reversing switch (7) is fixedly connected to the surface of the adjusting bellows (8); The filter plate (16) on the right side is blocked by the powder coating, causing the airflow to be completely cut off. The drying tube (9) will deflect. When the drying tube (9) deflects, the reversing switch (7) approaches the air supply box (5). After the control board (100) receives the signal, it causes the drive motor (2) to rotate in the opposite direction, thereby changing the gas flow direction and clearing the blockage of the filter plate (16) on the right side. The filter plate (16) on the left side performs filtration. This cycle ensures that the airflow in the drying tube (9) is evenly circulated and dries the powder coating.

2. The hot air circulating drying equipment for polyester resin coating production according to claim 1, characterized in that, It also includes: The drive gear (4) is fixed on the output shaft of the drive motor (2) and meshes with the spherical gear row (10) fixedly connected to the outside of the drying tube (9); The material turning strip (900) is fixed on the inside of the drying tube (9).

3. The hot air circulating drying equipment for polyester resin coating production according to claim 1, characterized in that, The spherical toothed row (10) is arc-shaped, and the center point of the spherical toothed row (10) is located on the rotation center line between the drying tube (9) and the support base (1).

4. The hot air circulating drying equipment for polyester resin coating production according to claim 1, characterized in that, A material control sleeve (11) is movably fitted on one side of the drying tube (9). The material control sleeve (11) is fixed on the adjusting air box (8). The side of the material control sleeve (11) is symmetrically arranged with a feed baffle (110) and a discharge baffle (111), and both the feed baffle (110) and the discharge baffle (111) are threaded onto the material control sleeve (11).

5. The hot air circulating drying equipment for polyester resin coating production according to claim 1, characterized in that, It also includes: The reversing rod (13) is fixedly connected to the air supply box (5) at the top and located on one side of the filter plate (16) at the bottom. It is also fixedly connected to the bottom with symmetrically arranged upper limit block (14) and lower limit block (15). The adjusting frame (18) is movably mounted on the reversing rod (13) at one end, and the adjusting cylinder (20) is threadedly connected to the end there. The other end is fitted onto the connecting pipe (22), and the clearing disc (17) is connected to the outside of the end through a bearing. The unclogging column (170) is fixed on the surface of the unclogging disc (17) and is used to unclogging the filter holes; The anti-detachment column (171) is fixed on the surface of the unclogging disc (17) and is used to guide the unclogging column (170) when it is inserted into the filter hole; The limiting spring (19) is connected at one end to the adjusting frame (18) and at the other end to the reversing rod (13).

6. The hot air circulating drying equipment for polyester resin coating production according to claim 5, characterized in that, A pressure relief valve (12) is installed on the adjusting air box (8).

7. The hot air circulating drying equipment for polyester resin coating production according to claim 5, characterized in that, It also includes: The limiting rod (23) is movably installed at the end of the adjusting cylinder (20), and the limiting rod (23) and the adjusting frame (18) are connected by a limiting spring (230). The transmission sleeve (21) is fixedly connected to the end of the limiting push rod (23) for the synchronous movement of the two limiting push rods (23); A unidirectional toothed rack (150) is fixed on the lower limit block (15); The reset slider (140) is slidably mounted on the upper limit block (14).

8. The hot air circulating drying equipment for polyester resin coating production according to claim 7, characterized in that, The bottom of the reset slider (140) is sloping and the side is arc-shaped.

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