Drying and UV curing device for PU paint

Abstract

The utility model relates to the technical field of paint baking devices. A drying and ultraviolet curing device for PU paint comprises a box with a sealed door, a rotatable material rack is arranged in the box, a heating system is symmetrically arranged on both sides of the material rack, an ultraviolet lamp is arranged on the other side, and a humidifier and an exhaust fan are also arranged. A temperature sensor and a humidity sensor are also arranged in the box, and the temperature sensor and the humidity sensor are connected to a control system outside the box, and the control system controls the heating system, the ultraviolet lamp, the humidifier and the exhaust fan. The above technical scheme solves the problem of controlling the temperature and humidity of the PU paint during the high-temperature curing process, and eliminates the problems of uneven drying of the paint film or wrinkling and cracking caused by temperature and humidity. Its beneficial effect is also that the ultraviolet curing method can also be implemented in the same device, which shortens the curing time, improves the production efficiency, reduces energy consumption, and reduces pollution to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of paint baking devices, in particular to a PU paint curing device. Background Art

[0002] PU paint is a high-performance coating with excellent weather resistance, chemical resistance and abrasion resistance. Curing is a key step in the formation of PU paint coating, and the quality of curing determines the hardness, durability and glossiness of the coating.

[0003] Currently, the most common PU paint curing method is drying curing, but this method requires good control of curing temperature and humidity. Otherwise, too high a temperature will cause uneven drying of the paint film or wrinkling, cracking and other problems; while too low a temperature will prolong the curing time.

[0004] Ultraviolet curing is another more advanced technology at present. Ultraviolet curing has the characteristics of fast curing speed, energy saving and environmental protection, but it has strict requirements on the exposure time and intensity of ultraviolet rays. Therefore, how to apply ultraviolet curing in baking equipment is a technical problem that urgently needs to be solved in the field of baking paint equipment technology. Utility Model Content

[0005] The purpose of the utility model is to provide a drying and ultraviolet curing device for PU paint to solve the above technical problems.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] The drying and ultraviolet PU paint curing device comprises a box body with a sealed door, a control system is also arranged outside the box body, a rotatable material rack is arranged inside the box body; the material rack is provided with at least two layers of brackets for carrying materials, which are called material brackets; electric heaters are symmetrically arranged along the material rack inside the box body; at least two fans are arranged behind the electric heater, and the air outlets of the fans are facing the material rack; at least three ultraviolet lamps are also arranged on the side of the box body facing the sealed door, and the ultraviolet lamps irradiate toward the material rack; an exhaust port is arranged on the box body, the exhaust port is arranged at the upper end of the box body, and an exhaust fan is arranged at the exhaust port; a humidifier is also included outside the box body, a humidification port is arranged at the lower end of the box body, and the humidification outlet of the humidifier is connected to the humidification port of the box body.

[0008] In the utility model, the material rack is a rotatable device. The material rack is provided with a multi-layer material support, and multiple pieces of materials to be cured can be placed at one time. When the material rack rotates during the curing process, the temperature environment or the amount of ultraviolet light irradiation of the materials on the material rack are the same, eliminating the defects of local differences.

[0009] Electric heaters are symmetrically arranged on both sides of the material rack. The advantage of this arrangement is that the temperature rises quickly and it is easy to control the temperature. A fan is arranged behind the electric heater to circulate the hot air in the box, making the heat distribution more even, preventing the local temperature from being too high or too low, which is conducive to better baking the PU paint surface and ensuring that the chemical properties of the paint will not decrease due to uneven heating.

[0010] An ultraviolet lamp is also arranged on one side of the box body, and ultraviolet curing can be implemented. Although the ultraviolet lamp is arranged asymmetrically, the material rack is rotating, so the material on the material rack can still be evenly irradiated by the ultraviolet lamp.

[0011] A humidifier and an exhaust fan are also provided. The humidification port is arranged at the lower end of the box, and the exhaust port is arranged at the upper end of the box. After moisture enters the box, it rises due to the heat of the electric heater. The exhaust port is arranged at the upper end of the box to easily discharge the rising moisture, thereby facilitating the adjustment of the humidity in the box and preventing problems such as uneven drying, wrinkling, and cracking of the paint film during the curing process.

[0012] Furthermore, the material rack also includes a rotating rod and a base frame; the rotating rod is a hollow metal rod, and the rotating rod is perpendicular to the base frame; the base frame includes an annular steel pipe, a cross support rod is radially arranged on the inner side of the annular steel pipe, and at least three rollers are arranged at the lower end of the annular steel pipe; the rotating rod and the base frame cross support rod are fixedly connected at the center; it also includes an annular guide rail, which is fixedly arranged on the bottom surface of the box body; the roller runs along the annular guide rail, and the circular trajectory formed by the roller coincides with the circle of the annular guide rail; the material support includes a ring with a flange, at least two annular rings of different sizes, and at least three connecting rods; the ring includes a disc-shaped flange and a cylindrical ring connected together, and a threaded through hole is arranged on the side wall of the ring; the annular ring is arranged in concentric circles with the ring as the center; the connecting rod is arranged with the ring as the center, and the central angle of the circle is evenly divided by 360°, the connecting rod is fixedly connected to the flange, and is fixedly connected to the annular rings arranged in each concentric circle in turn; the ring of the material support is connected to the rotating rod by a screw.

[0013] In the utility model, the annular steel pipe is conducive to enhancing the supporting strength of the base frame, and more rollers can be arranged under the annular steel pipe. More rollers are conducive to bearing the weight of the material to be solidified on the material rack, and the cross support rod can distribute the weight on the rotating rod and the material support to each roller.

[0014] The setting of the circular guide rail helps the rotation of the material rack and reduces the resistance when the roller rotates.

[0015] The material support adopts a plurality of annular rings of different sizes, which are fixedly connected by connecting rods, and each connecting rod is fixedly connected to the flange of the ring to form a spider web-shaped support. The support with this structure is firm and light.

[0016] Furthermore, a threaded hole is provided on the outer wall of the rotating rod, and the screw rod passes through the threaded through hole provided on the side wall of the collar to detachably connect the material support to the rotating rod.

[0017] In the utility model, threaded holes are evenly and equidistantly arranged on the rod wall of the rotating rod, and the distances between the material supports can be adjusted arbitrarily, so as to flexibly adapt to curing parts of different sizes.

[0018] Furthermore, a bearing is provided at the connection between the upper end of the rotating rod and the box top.

[0019] In the utility model, the rotating rod passes through the top of the box to connect to the rotating motor system, so a bearing is arranged between the rotating rod and the box wall to reduce friction during rotation. In addition, the bearing also plays a sealing role to reduce heat loss in the box.

[0020] Furthermore, it also includes a rotating motor system; the rotating motor system includes a motor and a reduction box, the reduction box has an input shaft and an output shaft, the motor shaft of the motor is connected to the input shaft of the reduction box, and the output shaft of the reduction box is connected to the upper end of the rotating rod through a coupling; the rotating motor system is arranged above the box body.

[0021] The function of the rotating motor system is to rotate the material rack through the rotating rod so that the materials on the material rack are subjected to uniform temperature or the same ultraviolet light.

[0022] Furthermore, the electric heater is a U-shaped heating tube.

[0023] The U-shaped heating tube heats up quickly, has a long service life, is easy to integrate and control, and can make the temperature distribution in the box more uniform.

[0024] Furthermore, a humidity sensor and a temperature sensor are also provided in the box; the humidity sensor has a humidity information output interface; the temperature sensor has a temperature information output interface; the control system has an information input interface and a control signal output interface; the humidity information output interface of the humidity sensor is connected to the information input interface of the control system; the temperature information output interface of the temperature sensor is connected to the information input interface of the control system; the control signal output interface of the control system is connected to the control switch of the heating system; the control signal output interface of the control system is connected to the control switch of the humidifier; the control signal output interface of the control system is connected to the control switch of the exhaust fan; and the control signal output interface of the control system is also connected to the control switch of the ultraviolet lamp.

[0025] The humidity sensor and temperature sensor detect the humidity and temperature in the box. The relevant humidity and temperature data are connected to the control system. The control system is equipped with humidity and temperature control logic. When the detection value is lower than the set threshold, the control system outputs control information to the heating system to increase the temperature and start the humidifier to humidify. If the detection value is higher than the set threshold, the control system stops outputting control information to the heating system, turns off the humidifier, and starts the exhaust fan to dehumidify. In this way, the box is maintained at a suitable temperature and humidity.

[0026] The utility model provides a rotatable material rack in the box, on which the parts to be cured are placed, and a heating system is symmetrically provided on both sides of the material rack. A fan is also provided behind the heating system, which has the beneficial effect of facilitating temperature control, uniform heat distribution in the box, and the parts to be cured on the material rack are heated equally during rotation, thereby eliminating defects caused by differences. An ultraviolet lamp is also provided in the box, which has the beneficial effect of enabling ultraviolet curing; a humidifier and an exhaust fan are also provided in the box, and under the control of the control system, the temperature in the box is controlled at a set value, and the humidity is controlled at a set value, thereby ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0028] Figure 1 It is a top view of the utility model;

[0029] Figure 2 It is a front view of the utility model;

[0030] Figure 3 It is a bottom view of the chassis of the utility model;

[0031] Figure 4 It is a front view of the utility model;

[0032] Figure 5 It is a schematic diagram of the installation of the collar and the rotating rod of the utility model.

[0033] Explanation of symbols:

[0034] 1. Sealed door; 2. Box body; 3. Electric heater; 4. Fan; 5. Material rack; 6. Ultraviolet lamp; 7. Humidifier; 8. Wet outlet; 9. Exhaust fan; 10. Annular guide rail; 11. Base frame; 12. Roller; 13. Rotating rod; 14. Material support; 15. Rotating motor system; 110. Annular steel pipe; 111. Cross support rod; 130. Threaded hole; 140. Ring; 141. Annular ring; 142. Connecting rod; 143. Threaded through hole. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0038] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Reference Figure 1 , Figure 2 As shown, the drying and ultraviolet PU paint curing device includes a box body 2 with a sealed door 1, a control system is also provided outside the box body 2, a rotatable material rack 5 is provided inside the box body 2; the material rack 5 is provided with at least two layers of brackets for carrying materials, which are called material brackets 14; electric heaters 3 are symmetrically arranged along the material rack 5 in the box body 2; at least two fans 4 are arranged behind the electric heater 3, and the air outlet of the fan 4 faces the material rack 5; at least three ultraviolet lamps 6 are also arranged on the side of the box body 2 facing the sealed door 1, and the ultraviolet lamps 6 irradiate the material rack 5; an exhaust outlet is provided on the box body 2, the exhaust outlet is arranged at the upper end of the box body 2, and an exhaust fan is provided at the exhaust outlet; a humidifier 7 is also included outside the box body 2, a humidification port is provided at the lower end of the box body 2, and the humidification outlet 8 of the humidifier 7 is connected to the humidification port of the box body 2.

[0040] In this embodiment, the material rack 5 is a rotatable device. The material rack 5 is provided with a multi-layer material support 14, and multiple pieces of materials to be cured can be placed at one time. When the material rack 5 rotates during the curing process, the temperature environment or the amount of ultraviolet light irradiation of the materials on the material rack 5 is the same, eliminating local defects with differences.

[0041] The electric heaters 3 are symmetrically arranged on both sides of the material rack 5. The advantages of arranging the electric heaters 3 in this way are fast and uniform heating, and easy control of the temperature. A fan 4 is arranged behind the electric heater 3. The blowing of the fan 4 can circulate the hot air in the box 2, making the heat distribution more uniform, preventing the local temperature from being too high or too low, and being conducive to better baking the PU paint surface, ensuring that the chemical properties of the paint will not decrease due to uneven heating.

[0042] At least three ultraviolet lamps 6 are also arranged on one side of the box body 2, so this embodiment can also adopt ultraviolet curing. Although the ultraviolet lamps 6 are arranged asymmetrically, the material rack 5 is rotating, so the workpiece material to be cured on the material rack 5 can still be evenly irradiated with ultraviolet rays.

[0043] A humidifier 7 and an exhaust fan 9 are also provided. Both the humidifier 7 and the exhaust fan 9 are existing mature technologies. Through the humidifier 7 and the exhaust fan 9, the humidity in the box 2 can be adjusted to prevent problems such as uneven drying, wrinkling, and cracking of the paint film during the curing process.

[0044] In this embodiment, the drying and ultraviolet PU paint curing device is arranged in a box, and can also be arranged in a sealed building.

[0045] Reference Figure 2 , Figure 3 , Figure 4As shown, the material rack 5 also includes a rotating rod 13 and a base frame 11; the rotating rod 13 is a hollow metal rod, and the rotating rod 13 is perpendicular to the base frame 11; the base frame 11 includes an annular steel pipe 110, and a cross support rod 111 is radially arranged on the inner side of the annular steel pipe 110, and at least three rollers 12 are arranged at the lower end of the annular steel pipe 110; the rotating rod 13 and the center of the cross support rod 111 of the base frame 11 are fixedly connected; it also includes an annular guide rail 10, and the annular guide rail 10 is fixedly arranged on the bottom surface of the box body 2; the roller 12 runs along the annular guide rail 10, and the circular track formed by the roller 12 coincides with the circle of the annular guide rail 10; The material support 14 includes a collar 140 with a flange, at least two annular rings 141 of different sizes, and at least three connecting rods 142; the collar 140 includes a disc-shaped flange and a cylindrical collar 140 connected together, and a threaded through hole 143 is provided on the side wall of the collar 140; the annular ring 141 is arranged in concentric circles with the collar 140 as the center; the connecting rod 142 is arranged with the collar 140 as the center and the central angle is evenly divided into 360 degrees, the connecting rod 142 is fixedly connected to the flange, and is fixedly connected to the annular rings 141 arranged in each concentric circle in turn; the collar 140 of the material support 14 is connected to the rotating rod 13 through a screw.

[0046] In this embodiment, the annular steel pipe 110 is helpful to enhance the supporting strength of the base frame 11, and more rollers 12 can be arranged under the annular steel pipe 110. More rollers 12 are helpful to bear the weight of the material to be solidified on the material rack 5. The cross support rod 111 can distribute the weight on the rotating rod 13 and the material support 14 to each roller 12.

[0047] The setting of the annular guide rail 10 helps the rotation of the material rack 5 and reduces the resistance of the roller 12 when rotating. The annular guide rail 9 is made of stainless steel C-shaped guide rail steel and processed into a ring shape. The material rack 5 rolls in the guide rail 9 through at least 3 rollers 11 set on the base frame 10, and then drives the material rack 5 to rotate in the box body 2.

[0048] In this embodiment, the material support 14 includes a plurality of annular rings 141 of different sizes, the annular rings 141 are made of stainless steel bars, the connecting rods are made of stainless steel bars, the connecting rods 142 are arranged from the flange of the collar along the radial direction of the concentric rings to the outermost annular ring 141, the contact line between the connecting rod 142 and the collar flange, and the contact point between the connecting rod 142 and the annular ring 141 are all fixedly connected by spot welding to form a spider web-shaped material support 14, and the support of this structure is firm and light. Multiple workpiece materials to be cured can be placed on the material support 14, and when the material rack 5 rotates during the curing process, the temperature environment or the amount of ultraviolet light irradiated to the workpieces on the material support 14 can be kept consistent, eliminating the defects of local differences.

[0049] Reference Figure 5 As shown, the outer wall of the rotating rod 13 is provided with a threaded hole 130 , and the screw passes through a threaded through hole 143 provided on the side wall of the collar to detachably connect the material support 14 to the rotating rod 13 .

[0050] In this embodiment, threaded holes 130 are evenly spaced on the rod wall of the rotating rod 13 , and the distance between the material holders 14 can be adjusted arbitrarily, which can flexibly adapt to curing parts of different sizes.

[0051] A bearing is provided at the connection between the upper end of the rotating rod 13 and the box top.

[0052] In this embodiment, the rotating rod 13 passes through the top of the box and is connected to the rotating motor system 15. Therefore, a bearing is arranged between the rotating rod 13 and the box wall to reduce friction during rotation. In addition, the bearing also plays a sealing role to reduce heat loss in the box body 2.

[0053] It also includes a rotating motor system 15; the rotating motor system 15 includes a motor and a reduction box, the reduction box has an input shaft and an output shaft, the motor shaft of the motor is connected to the input shaft of the reduction box, and the output shaft of the reduction box is connected to the upper end of the rotating rod 13 through a coupling; the rotating motor system 15 is arranged above the box body 2.

[0054] In this embodiment, the function of the rotating motor system 15 is to drive the rotating rod 13 to rotate, and then drive the entire material rack 5 to rotate through the rotating rod 13. After the material rack 5 rotates, the workpiece material to be cured on the material support 14 can be subjected to uniform temperature or the same ultraviolet light.

[0055] The electric heater 3 is a U-shaped heating tube.

[0056] The U-shaped heating tube heats up quickly, has a long service life, is easy to integrate and control, and can make the temperature distribution in the box body 2 more uniform.

[0057] A humidity sensor and a temperature sensor are also provided in the box 2; the humidity sensor has a humidity information output interface; the temperature sensor has a temperature information output interface; the control system has an information input interface and a control signal output interface; the humidity information output interface of the humidity sensor is connected to the information input interface of the control system; the temperature information output interface of the temperature sensor is connected to the information input interface of the control system; the control signal output interface of the control system is connected to the control switch of the electric heater 3; the control signal output interface of the control system is connected to the control switch of the humidifier 7; the control signal output interface of the control system is connected to the control switch of the exhaust fan; the control signal output interface of the control system is also connected to the control switch of the ultraviolet lamp 6.

[0058] The humidity sensor and the temperature sensor detect the humidity and temperature in the box 2, and the relevant humidity and temperature data are connected to the control system. The control system is provided with the control logic of humidity and temperature. When the detection value is lower than the set threshold, the control system outputs the control information to the electric heater 3 for heating and temperature increase, and starts the humidifier 7 for humidification. If the detection value is higher than the set threshold, the control information output to the electric heater 3 is stopped, and the temperature will slowly drop; or the humidifier 7 is turned off, and the exhaust fan is started for dehumidification; thereby maintaining the box 2 at a suitable temperature and humidity.

[0059] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, ie, those features that are not relevant to the best mode of the invention or those features that are not relevant to implementing the invention.

[0060] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A drying and ultraviolet curing device for PU paint, comprising a box with a sealed door, and a control system is also arranged outside the box, characterized in that: A rotatable material rack is provided in the box; The material rack is provided with at least two layers of supports for carrying materials, which are called material supports; Electric heaters are symmetrically arranged along the material rack in the box; At least two fans are arranged behind the electric heater, and the air outlets of the fans face the material rack; At least three ultraviolet lamps are also arranged on one side of the box body facing the sealed door, and the ultraviolet lamps irradiate toward the material rack; The box body is provided with an exhaust port, which is arranged at the upper end of the box body, and an exhaust fan is arranged at the exhaust port; A humidifier is also included outside the box body, a humidification port is arranged at the lower end of the box body, and the moisture outlet of the humidifier is connected to the humidification port of the box body.

2. The drying and UV curing device for PU paint according to claim 1, characterized in that: The material rack also includes a rotating rod and a bottom frame; The turning rod is a hollow metal rod, which is perpendicular to the base frame; The base frame includes an annular steel pipe, a cross support rod is arranged radially inside the annular steel pipe, and at least three rollers are arranged at the lower end of the annular steel pipe; The rotating rod is fixedly connected to the center of the cross support rod of the base frame; It also includes an annular guide rail, which is fixedly arranged on the bottom surface of the box body; The roller runs along the annular guide rail, and the circular track formed by the roller coincides with the circle of the annular guide rail; The material support comprises a collar with a flange, at least two annular rings of different sizes, and at least three connecting rods; The collar is formed by connecting a disc-shaped flange and a cylindrical collar, and a threaded through hole is arranged on the side wall of the collar; The annular ring is arranged concentrically with the collar as the center; The connecting rod is set with the collar as the center and is evenly divided into 360° central angles. The connecting rod is fixedly connected to the flange and is fixedly connected to the annular rings set in each concentric circle in turn.

3. The drying and UV curing device for PU paint according to claim 2, characterized in that: The outer wall of the rotating rod is provided with a threaded hole, and the collar of the material support is detachably connected to the rotating rod through a screw rod.

4. The drying and UV curing device for PU paint according to claim 2, characterized in that: A bearing is arranged at the connection between the upper end of the rotating rod and the box top.

5. The drying and UV curing device for PU paint according to claim 1, characterized in that: Also includes a rotating motor system; The rotating motor system includes a motor and a reduction box, the reduction box has an input shaft and an output shaft, the motor shaft of the motor is connected to the input shaft of the reduction box, and the output shaft of the reduction box is connected to the upper end of the rotating rod through a coupling; The rotating motor system is arranged above the box body.

6. The drying and UV curing device for PU paint according to claim 1, characterized in that: The electric heater is a U-shaped heating tube.

7. The drying and UV curing device for PU paint according to claim 1, characterized in that: A humidity sensor and a temperature sensor are also provided in the box; The humidity sensor has a humidity information output interface; The temperature sensor has a temperature information output interface; The control system has an information input interface and a control signal output interface; The humidity information output interface of the humidity sensor is connected to the information input interface of the control system; The temperature information output interface of the temperature sensor is connected to the information input interface of the control system; The control signal output interface of the control system is connected to the control switch of the electric heater; The control signal output interface of the control system is connected to the control switch of the humidifier; The control signal output interface of the control system is connected to the control switch of the exhaust fan; The control signal output interface of the control system is also connected to the control switch of the ultraviolet lamp.

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