Powder coating, drying and curing device heated by single burner

Abstract

The utility model discloses a powder coating, drying and curing device heated by a single combustion engine. The powder coating, drying and curing device comprises a box body and a combustion cavity formed in the bottom of the box body; the box body comprises a drying cavity and a curing cavity, and a heating system for supplying hot air to the curing cavity is arranged in the combustion cavity in a matched mode; a heat supply pipeline communicating with the output end of the heating system and a circulating air pipeline communicating with the heat supply pipeline are sequentially arranged in the curing cavity in the hot air flowing direction. An air supply port is formed in the circulating air pipeline, the combustion cavity communicates with an air return pipeline, an air return port is formed in the end, away from the combustion cavity, of the air return pipeline, and a heat transfer wall plate used for curing a coated workpiece is arranged at the joint of the drying cavity and the curing cavity; the drying cavity for coating and the curing cavity share one fuel gas burner, and the burner is mounted on the curing cavity, so that the energy consumption of equipment is reduced by reducing the number of the fuel gas burners and the number of circulating fans, and the purposes of saving energy and improving heat efficiency are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of coating equipment, and in particular to a powder coating drying and curing device using a single burner for heating. Background Art

[0002] Powder coating technology is an environmentally friendly and efficient surface treatment technology. It is widely used in many industrial fields such as household appliance components, hardware accessories, automotive parts, communication facilities, engineering machinery and equipment, etc. It can achieve metal corrosion protection and decoration. Compared with the natural drying film formation process of liquid coatings, powder coating needs to be cured at high temperature to form a film.

[0003] The existing metal coating process is generally equipped with an independent drying chamber, which uses a smaller burner for drying and dehydration, and then coating. After coating, the workpiece enters the curing chamber to form a coating at high temperature. Because the coating requires a high temperature and the light-colored coating requires clean air in the oven, the curing chamber mostly uses a high-power burner and transfers heat through a shell-and-tube heat exchanger. In addition, since drying and curing use independent heating systems to dry and cure the powder coating respectively, it not only increases the equipment cost, but also there are problems such as low energy utilization efficiency and complicated operation in the powder coating process.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] In view of at least one of the above technical problems, the present disclosure provides a powder coating drying and curing device with single burner heating to solve the problems of low thermal efficiency, high cost and energy waste caused by using independent heating systems in the existing drying and curing processes.

[0006] According to one aspect of the present disclosure, a powder coating drying and curing device with heat supplied by a single burner is provided, comprising a box body and a combustion chamber arranged at the bottom of the box body; the box body comprises a drying chamber and a curing chamber, and the combustion chamber is provided with a heating system for supplying hot air to the curing chamber; the interior of the curing chamber is provided with a heating pipe connected to an output end of the heating system and a circulating air duct connected to the heating pipe in sequence along the direction of hot air flow; an air supply port is provided on the circulating air duct, the combustion chamber is connected to a return air duct, a return air port is provided at one end of the return air duct away from the combustion chamber, and a heat transfer wall panel for curing the painted workpiece is provided at the connection between the drying chamber and the curing chamber.

[0007] In some embodiments of the present disclosure, the heating system includes a gas burner, a combustion heat exchange chamber connected to an air outlet of the gas burner, and a circulation fan disposed in the combustion heat exchange chamber.

[0008] In some embodiments of the present disclosure, a heat exchange pipe connected to the heat supply pipe is provided in the drying chamber.

[0009] In some embodiments of the present disclosure, a plurality of inspection openings are provided on the heat exchange pipe, and a closing plate for sealing the inspection openings is provided on the inspection openings.

[0010] In some embodiments of the present disclosure, a baffle is provided at a corresponding position of the air inlet of the heat exchange pipe to adjust the temperature inside the drying chamber.

[0011] In some embodiments of the present disclosure, the heat transfer wall plate is a copper-zinc plate.

[0012] In some embodiments of the present disclosure, the circulating air duct is a flow-through heat pipe.

[0013] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages:

[0014] 1. The drying chamber and the curing chamber share a gas burner, and the burner is installed on the curing chamber. Therefore, by reducing the number of gas burners and circulating fans, the energy consumption of the equipment is greatly reduced, thereby achieving the purpose of saving energy and improving thermal efficiency.

[0015] 2. By improving the heat source and heat circulation method of the drying chamber, the structure of the drying chamber is simplified, making operation and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a powder coating drying and curing device in one embodiment of the present application.

[0017] Figure 2 It is a top view of a powder coating drying and curing device in one embodiment of the present application.

[0018] Figure 3 It is a schematic structural diagram of a powder coating drying and curing device in one embodiment of the present application.

[0019] Figure 4 This is a front view of a powder coating drying and curing device in another embodiment of the present application.

[0020] Figure 5 This is a front view of a powder coating drying and curing device in another embodiment of the present application.

[0021] Figure 6 This is a top view of a powder coating drying and curing device in yet another embodiment of the present application.

[0022] In the above figures, 1 is a box body; 2 is a drying chamber; 3 is a curing chamber; 4 is a heating duct; 5 is a circulating air duct; 6 is a return air duct; 7 is a return air outlet; 8 is a heat transfer wall panel; 9 is a gas burner; 10 is a heat exchange duct; 11 is a baffle; and 12 is a combustion chamber. DETAILED DESCRIPTION

[0023] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] The unit modules, parts, structures, mechanisms and other devices involved in the following embodiments are all conventional commercially available products unless otherwise specified.

[0025] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] This example discloses a powder coating drying and curing device with heating provided by a single burner (see Figure 1 ), including a box body and a combustion chamber arranged at the bottom of the box body.

[0027] The length of the combustion chamber is 0.7 to 1 m, and a gas burner 9 is provided in the combustion chamber for supplying hot air to the curing chamber. The specifications of the gas burner 9 are adjusted according to the volume of the curing chamber 3 and the drying chamber 2. In this embodiment, the combustion furnace of the gas burner 9 is welded with 3 mm thick high temperature resistant stainless steel 310S, and the size of the furnace can be φ0.8m×1.2m, and the conical furnace cap is φ0.5m×0.3m. The power of the gas burner 9 is 40-100m 3 The gas burner 9 output port is connected with a combustion heat exchange chamber, and a circulating fan is arranged in the gas heat exchange chamber. The combustion exhaust gas of the gas burner 9 is sent into the curing chamber 3 along with the circulating wind through the insulation pipe. The drying temperature can be adjusted by adjusting the circulating wind size.

[0028] The box body 1 includes a drying chamber 2 and a curing chamber 3. A heating pipe 4 connected to the output end of the gas burner 9 and a circulating air pipe 5 connected to the heating pipe 4 are arranged in sequence inside the curing chamber 3 along the hot air flow direction; an air supply port is opened on the circulating air pipe 5, and a return air pipe 6 is connected to the top of the combustion chamber. A return air port 7 is opened at one end of the return air pipe 6 away from the combustion chamber. In this embodiment, see Figure 1 and Figure 2 The output end of the circulating fan is connected to the heating pipe 4 arranged along the height direction of the box body 1 to provide heat for the curing chamber 3. The circulating air duct 5 is U-shaped and arranged at the top of the box body 1 to change the temperature of the drying chamber 2. One end of the return air duct 6 extends to the bottom of the curing chamber 3, and the other end is connected to the combustion chamber 12 to realize air circulation and heat recovery. In this way, hot air is sent into the curing chamber 3 from above. After being dispersed inside the curing chamber 3, the hot air is sucked into the return air duct 6 at the bottom of the curing chamber 3, and then recycled after being processed. The curing chamber 3 is heated in the form of upper air supply and lower return air, and the temperature is evenly distributed.

[0029] In some other embodiments (see Figure 3 , Figure 4 ), the heating pipe 4 and the circulating air duct 5 are both arranged at the bottom of the curing chamber 3, the heating pipe 4 is arranged along the length direction of the curing chamber 3, the return air duct 6 is arranged on one side of the curing chamber 3, one end of the return air duct 6 is connected to the top of the curing chamber 3, and the other end is connected to the combustion chamber 12. In this way, hot air is sent into the curing chamber 3 from the bottom, and then after being dispersed inside the curing chamber 3, the hot air is sucked into the return air duct 6 above the curing chamber 3 for processing, and the curing chamber 3 is heated in the way of lower air supply and upper return air, which more effectively controls the air flow and achieves higher energy efficiency. The curing chamber 3 and the drying chamber 2 share a heating system and circulating air duct 5 for heating, and the heat of the curing chamber 3 and the drying chamber 2 comes from the gas burner 9 on the curing chamber 3.

[0030] A heat transfer wall panel 8 for curing the painted workpiece is provided at the connection between the drying chamber 2 and the curing chamber 3. The heat transfer wall panel 8 provides a constant temperature source for the drying chamber 2. The drying temperature can be adjusted by adjusting the area of ​​the heat transfer wall panel 8. In this embodiment, the heat transfer wall panel 8 is 0.5 mm thick and has an area of ​​2.2 m×8.4 m. The installation process of the heat transfer wall panel 8 is as follows: a 50 mm×50 mm angle steel welding frame is used at the connection between the drying chamber and the curing chamber 3. Several plates with a length of 2.0 m and a width of 1.5 m are connected into a heat transfer wall panel 8 by welding or riveting, and high-temperature resistant glue is used at the joints for sealing, and the heat transfer wall panel 8 is fully welded between the frames.

[0031] The drying chamber 2 is provided with a heat exchange pipe 10 connected to the heat supply pipe 4. The heat exchange pipe 10 has a thickness of 1m and a volume of 0.2m×0.2mm×20m. The heat exchange pipe 10 is formed by a U-shaped groove and a U-shaped top plate being riveted together to form a sealed heat exchange pipe 10. In this embodiment, see Figure 1 and Figure 2, the heat exchange tube 10 is arranged along the width direction of the drying chamber 2. In another embodiment, see Figure 3 and Figure 4 The heat exchange pipe 10 is arranged circumferentially along the inner wall of the drying chamber 2. Through the arrangement of the heat exchange pipe 10, the hot air is circulated in the drying chamber 2, so that its heat energy can be effectively transferred, ensuring that the hot air can be evenly and continuously circulated in the drying chamber, thereby achieving an efficient drying effect. In some other embodiments, see Figure 5 and Figure 6 The drying chamber 2 is not provided with a heat exchange pipe 10, and the drying chamber 2 is heated by providing a heat transfer wall plate 8 with a larger area.

[0032] The heat exchange pipe 10 is provided with a plurality of inspection openings. In the present embodiment, there are four inspection openings with an opening size of 200 mm×200 mm. The inspection openings are provided with closing plates for sealing the inspection openings, so as to facilitate the cleaning of volatile crystals of powder in the pipe, thereby ensuring the heat exchange efficiency. A baffle 11 is provided at the corresponding position of the air inlet of the heat exchange pipe 10. The opening and closing of the baffle 11 as well as the opening size can be used to adjust the size of the ventilation cross-section, thereby realizing flexible adjustment of the temperature inside the drying chamber 2. This process is closely coordinated with the heat exchange pipe 10, and they work together to ensure the drying effect while further optimizing energy utilization and improving the drying efficiency.

[0033] The return air duct 7, circulating air duct 5 and heat transfer wall panel 8 can be made of stainless steel, copper, aluminum and copper-zinc. In this embodiment, the return air duct 7, circulating air duct 5 and heat transfer wall panel 8 are made of copper-zinc, and the box body 1 and the combustion heat exchange chamber are made of insulation board material.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A powder coating drying and curing device with heating provided by a single burner, characterized in that: It includes a box body and a combustion chamber arranged at the bottom of the box body; the box body includes a drying chamber and a curing chamber, and the combustion chamber is provided with a heating system for supplying hot air to the curing chamber; the inside of the curing chamber is provided with a heating pipe connected to the output end of the heating system and a circulating air duct connected to the heating pipe in sequence along the hot air flow direction; an air supply port is provided on the circulating air duct, the combustion chamber is connected to a return air duct, and a return air port is provided at one end of the return air duct away from the combustion chamber, and a heat transfer wall panel for curing the painted workpiece is provided at the connection between the drying chamber and the curing chamber.

2. The powder coating drying and curing device according to claim 1, characterized in that: The heating system comprises a gas burner, a combustion heat exchange chamber connected to an air outlet of the gas burner, and a circulation fan arranged in the combustion heat exchange chamber.

3. The powder coating drying and curing device according to claim 1, characterized in that: A heat exchange pipe communicating with the heat supply pipe is arranged in the drying chamber.

4. The powder coating drying and curing device according to claim 3, characterized in that: The heat exchange pipe is provided with a plurality of inspection openings, and the inspection openings are provided with closing plates for sealing the inspection openings.

5. The powder coating drying and curing device according to claim 3, characterized in that: A baffle is provided at a corresponding position of the air inlet of the heat exchange pipe to adjust the temperature inside the drying chamber.

6. The powder coating drying and curing device according to claim 1, characterized in that: The heat transfer wall plate is a copper-zinc plate.

7. The powder coating drying and curing device according to claim 1, characterized in that: The circulating air duct is a flow-through heat conduction pipe.

Images