Energy-saving hot air circulating electrostatic powder curing furnace

Abstract

The utility model relates to electrostatic powder solidification furnace technical field discloses an energy -saving hot -blast circulation electrostatic powder solidification furnace, including solidification furnace body, outer circulation air supply component, inner air supply main pipe, inner air supply increment branch pipe, inner return air main pipe and inner return air increment branch pipe, wherein the first air supply mouth of multiple sets is opened to the inner air supply main pipe, the second air supply mouth of multiple sets is opened to the inner air supply increment branch pipe, the first return air mouth of multiple sets is opened to the inner return air main pipe, and the second return air mouth of multiple sets is opened to the inner return air increment branch pipe. The hot -blast circulation structure of the energy -saving powder solidification furnace has the advantages that temperature uniformity is good, can effectively save energy consumption, and promotes product quality consistency.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic powder curing oven technology, specifically to an energy-saving hot air circulating electrostatic powder curing oven. Background Technology

[0002] Hot air circulating curing ovens are one of the core pieces of equipment in electrostatic powder coating production lines, and their energy consumption typically accounts for more than 40% of the total energy consumption of the coating workshop. Temperature uniformity within the oven is crucial for ensuring consistent coating curing quality (gloss, hardness, durability). Traditional curing ovens often employ a vertical circulation method with top-supply and bottom-return air. This method is prone to airflow "short circuits" and circulation dead zones, resulting in significant temperature differences (often exceeding ±10℃) in different areas of the oven chamber, especially at the four corners and in areas with densely packed workpieces.

[0003] To reach the lower limit of the temperature required by the process, operators often need to increase the overall set temperature of the furnace, which results in a huge waste of energy. In addition, uneven temperature may also cause some parts of the workpiece to be under-cured while others are over-cured, affecting product quality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide an energy-saving hot air circulating electrostatic powder curing oven with good temperature uniformity, which can effectively save energy consumption and improve product quality consistency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An energy-saving hot air circulating electrostatic powder curing oven includes: Curing furnace body; An external circulation air supply component is located outside the curing oven body to increase the temperature of the hot air and drive the hot air to circulate. An internal air supply main pipe is located inside the curing oven body. The output end of the external circulation air supply component is connected to the input end of the internal air supply main pipe. Several sets of first air outlets are spaced apart along the length of the internal air supply main pipe. An internal air supply increment branch pipe is located inside the curing oven on the side away from the output end of the external circulation air supply component. The internal air supply increment branch pipe is connected to the internal air supply main pipe. Several sets of second air supply ports are spaced apart along the length direction on the internal air supply increment branch pipe. An internal return air main pipe is installed inside the curing oven body. The output end of the internal return air main pipe is connected to the input end of the external circulation air supply component. Several sets of first return air inlets are spaced apart along the length of the internal return air main pipe. An internal return air increment branch pipe is located on the side of the curing oven body away from the input end of the external circulation air supply component. The internal return air increment branch pipe is connected to the internal return air main pipe. Several sets of second return air inlets are spaced apart along the length of the internal return air increment branch pipe.

[0006] As a further improvement to the above technical solution: The external circulation air supply assembly includes a heat exchange device, a supply fan, and an external air supply duct connected in sequence. The output end of the internal return air main is connected to the input end of the heat exchange device, and the output end of the external air supply duct is connected to the input end of the internal air supply main.

[0007] The main internal air supply pipe is installed on the top inner wall of the curing oven body, and the internal air supply increment branch pipe is installed at the bottom of the main internal air supply pipe. The internal return air main pipe is installed on the bottom inner wall of the curing oven body, and the internal return air increment branch pipe is installed on the top of the internal return air main pipe.

[0008] The internal air supply main pipe is a rectangular square tube structure. The first air outlets are respectively located on the two side walls of the internal air supply main pipe, and the air supply direction of the first air outlets is horizontally towards the inner side wall of the curing furnace body. The internal air supply increment branch pipe is a trapezoidal pipe structure that is wider at the top and narrower at the bottom. The second air outlet is located on both sides of the internal air supply increment branch pipe. The air supply direction of the second air outlet is inclined downward toward the inner side wall of the curing furnace body.

[0009] The internal return air main pipe is a rectangular square tube structure. The first return air inlets are respectively located on the two side walls of the internal return air main pipe. The return air direction of the first return air inlets is horizontally away from the inner side wall of the curing furnace body. The internal return air increment branch pipe is a trapezoidal pipe structure that is narrow at the top and wide at the bottom. The second return air inlets are respectively located on the two side walls of the internal return air increment branch pipe. The return air direction of the second return air inlets is inclined downward and away from the inner side wall of the curing furnace body.

[0010] The first air supply outlet and the second air supply outlet are arranged in an alternating pattern in the vertical direction, and the first return air outlet and the second return air outlet are arranged in an alternating pattern in the vertical direction.

[0011] The curing furnace body includes a small-cavity furnace section, a transition furnace section, and a large-cavity furnace section connected in sequence. The external circulation air supply assembly is located outside the small-cavity furnace section, and the internal air supply increment branch pipe and the internal return air increment branch pipe are located inside the transition furnace section and the large-cavity furnace section.

[0012] The top inner wall of the curing furnace is equipped with a workpiece hoisting conveyor line, which includes a feeding conveyor section, a rotary conveyor section and a discharging conveyor section connected in sequence. The feeding conveyor section extends along the small-cavity furnace section and the transition furnace section into the large-cavity furnace section. The rotary conveyor section is located in the large-cavity furnace section and forms a 180° turnaround path. The discharging conveyor section extends along the transition furnace section and the small-cavity furnace section outward.

[0013] Compared with the prior art, the advantages of this utility model are: This utility model discloses an energy-saving hot air circulating electrostatic powder curing oven. An internal air supply increment branch pipe is connected to the side of the internal air supply main pipe away from the output end of the external air circulation component. Multiple sets of second air supply outlets are provided on the internal air supply increment branch pipe. Similarly, an internal return air increment branch pipe is connected to the side of the internal return air main pipe away from the input end of the external air circulation component. Multiple sets of second return air outlets are provided on the internal return air increment branch pipe. This allows the first and second air supply outlets to cooperate to form a "strong air supply zone," and the first and second return air outlets to cooperate to form a "strong return air zone." In a pre-defined area where the temperature is prone to be low at a distance, the "strong air supply zone" and "strong return air zone" are used to address this issue. This design allows for on-demand distribution of hot air heat within the furnace, compensating for localized heat loss at the far end of the furnace. It significantly improves the temperature uniformity of the effective working area within the curing furnace, controlling temperature differences between different areas within the furnace to within ±5℃. Due to the improved temperature uniformity, there is no need to increase the overall furnace temperature to ensure the low-temperature point meets the standard. Under the premise of ensuring the same curing quality, the furnace setting temperature can be lowered, directly resulting in significant savings in natural gas or electricity. Moreover, the uniform and stable temperature field ensures that each workpiece undergoes the same thermal process, resulting in highly consistent curing degree, color, and performance, effectively improving product quality consistency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an energy-saving hot air circulating electrostatic powder curing oven.

[0015] Figure 2 This is a schematic diagram of the internal structure of an energy-saving hot air circulating electrostatic powder curing oven.

[0016] Figure 3 This is a top-view structural diagram of an energy-saving hot air circulating electrostatic powder curing oven.

[0017] Figure 4 This is a frontal view of the structure of an energy-saving hot air circulating electrostatic powder curing oven.

[0018] Figure 5 This is a side view structural diagram of an energy-saving hot air circulating electrostatic powder curing oven.

[0019] Figure 6This is a structural diagram of the internal air supply main pipe, the internal air supply increment branch pipe, the internal return air main pipe, and the internal return air increment branch pipe.

[0020] Figure 7 This is a schematic diagram showing the hot air flow direction of the main internal air supply pipe, the internal air supply increment branch pipe, the internal return air main pipe, and the internal return air increment branch pipe.

[0021] Legend: 1. Curing furnace body; 101. Small-capacity furnace section; 102. Transition furnace section; 103. Large-capacity furnace section; 2. External circulation air supply assembly; 201. Heat exchange device; 202. Air supply fan; 203. External air supply duct; 3. Internal air supply main pipe; 301. First air supply outlet; 4. Internal air supply increment branch pipe; 401. Second air supply outlet; 5. Internal return air main pipe; 501. First return air outlet; 6. Internal return air increment branch pipe; 601. Second return air outlet; 7. Workpiece hoisting and conveying line; 701. Feeding conveying section; 702. Rotary conveying section; 703. Discharge conveying section; 100. Workpiece. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 7 As shown, the energy-saving hot air circulating electrostatic powder curing oven of this embodiment includes: a curing oven body 1; an external circulation air supply component 2, disposed outside the curing oven body 1, used to increase the hot air temperature and drive the hot air to circulate; an internal air supply main pipe 3, disposed inside the curing oven body 1, the output end of the external circulation air supply component 2 being connected to the input end of the internal air supply main pipe 3, and a plurality of first air supply ports 301 spaced apart along the length direction on the internal air supply main pipe 3; and an internal air supply increment branch pipe 4, disposed inside the curing oven body 1 on the side away from the output end of the external circulation air supply component 2, the internal air supply increment branch pipe 4 being connected to the internal air supply main pipe 3. The internal air supply incremental branch pipe 4 is provided with several sets of second air supply ports 401 spaced apart along its length; the internal return air main pipe 5 is located inside the curing oven body 1, and the output end of the internal return air main pipe 5 is connected to the input end of the external circulation air supply component 2, and several sets of first return air ports 501 spaced apart along its length; the internal return air incremental branch pipe 6 is located inside the curing oven body 1 on the side away from the input end of the external circulation air supply component 2, and the internal return air incremental branch pipe 6 is connected to the internal return air main pipe 5, and several sets of second return air ports 601 spaced apart along its length.

[0024] This energy-saving hot air circulating electrostatic powder curing oven includes a curing oven body 1. An external circulation air supply component 2 is installed outside the curing oven body 1. An internal air supply main pipe 3 and an internal return air main pipe 5 are installed inside the curing oven body 1. Multiple sets of first air supply ports 301 are opened on the internal air supply main pipe 3, and multiple sets of first return air ports 501 are opened on the internal return air main pipe 5. The internal air supply main pipe 3 is connected to the output end of the external circulation air supply component 2, and the internal return air main pipe 5 is connected to the input end of the external circulation air supply component 2. Because the internal air supply main pipe 3 is close to the external air supply component 2… The heat distribution on the side of the output end of the circulating air supply component 2 is generally higher than that on the side away from the output end of the external circulating air supply component 2, exhibiting a gradient distribution characteristic of gradually decreasing temperature and gradually decreasing air volume. Therefore, in order to further optimize the hot airflow distribution inside the curing oven 1, an internal air supply increment branch pipe 4 is connected to the side of the internal air supply main pipe 3 away from the output end of the external circulating air supply component 2. Multiple sets of second air outlets 401 are opened on the internal air supply increment branch pipe 4. The side of the internal return air main pipe 5 away from the input end of the external circulating air supply component 2 is connected to... The furnace is connected to an internal return air increment branch pipe 6, which has multiple sets of second return air inlets 601. This allows the first air outlet 301 and the second air outlet 401 to work together to form a "strong air supply zone," and the first return air inlet 501 and the second return air inlet 601 to work together to form a "strong return air zone." In the preset area where the temperature is prone to be low at the far end, the "strong air supply zone" and the "strong return air zone" work together to achieve on-demand distribution of hot air heat inside the furnace body, compensating for local heat loss at the far end of the furnace body. This significantly improves the temperature uniformity of the effective working area within the curing furnace body 1, and controls the temperature difference between different areas within the furnace body to within ±5℃. Due to the improved temperature uniformity, there is no need to increase the overall furnace temperature to ensure that the low temperature point meets the standard. Under the premise of ensuring the same curing quality, the furnace body setting temperature can be reduced, directly resulting in significant savings in natural gas or electricity (usually up to 8%-15%). Moreover, the uniform and stable temperature field ensures that each workpiece undergoes the same thermal process, resulting in highly consistent curing degree, color, and performance, effectively improving product quality consistency.

[0025] Preferably, the external circulation air supply assembly 2 includes a heat exchange device 201, a blower 202, and an external air supply duct 203 connected in sequence. The output end of the internal return air main duct 5 is connected to the input end of the heat exchange device 201, and the output end of the external air supply duct 203 is connected to the input end of the internal air supply duct 3. In this embodiment, the low-temperature return air after heat exchange in the curing oven 1 enters the heat exchange device 201 through the output end of the internal return air main duct 5. The heat exchange device 201 adopts a direct heating mode with a burner. The flame generated by the burner directly heats the low-temperature return air in the heat exchange device 201, resulting in high heat conversion efficiency and rapid heating of the hot air. The output end of the heat exchange device 201 is connected to the blower 202, which provides air pressure for the hot air circulation. The heated hot air is pressurized and transported through the external air supply duct 203 to the internal air supply duct 3 in the curing oven 1, forming a complete external hot air heat exchange and transportation air path, thereby increasing the hot air temperature and driving the hot air circulation.

[0026] Preferably, the internal air supply main pipe 3 is installed on the top inner wall of the curing oven body 1, and the internal air supply increment branch pipe 4 is installed at the bottom of the internal air supply main pipe 3; the internal return air main pipe 5 is installed on the bottom inner wall of the curing oven body 1, and the internal return air increment branch pipe 6 is installed at the top of the internal return air main pipe 5. In this embodiment, the internal air supply main pipe 3, the internal air supply increment branch pipe 4, the internal return air main pipe 5, and the internal return air increment branch pipe 6 are arranged in a mirror symmetrical manner, and the air supply volume at the top of the curing oven body 1 is consistent with the return air volume at the bottom, forming a regular and stable hot air circulation flow field in the curing oven body 1, ensuring that the workpiece 100 is heated evenly when transported in the curing oven body 1.

[0027] Preferably, the internal air supply main pipe 3 is a rectangular square tube structure, with first air outlets 301 respectively located on both side walls of the internal air supply main pipe 3, and the air supply direction of the first air outlets 301 being horizontal towards the inner side wall of the curing furnace body 1; the internal air supply increment branch pipe 4 is a trapezoidal pipe structure that is wider at the top and narrower at the bottom, with second air outlets 401 respectively located on both side walls of the internal air supply increment branch pipe 4, and the air supply direction of the second air outlets 401 being inclined downward towards the inner side wall of the curing furnace body 1. In this embodiment, as... Figure 6 and Figure 7As shown, the internal air supply main pipe 3 adopts a rectangular square tube structure. Multiple sets of first air outlets 301 are spaced along the length of both the left and right side walls of the internal air supply main pipe 3. The air outlets 301 extend horizontally, and the hot air inside the internal air supply main pipe 3 is blown horizontally towards the inner walls of both sides of the curing furnace body 1. The internal air supply increment branch pipe 4 adopts a trapezoidal pipe structure that is wider at the top and narrower at the bottom. The top of the internal air supply increment branch pipe 4 is set as an open opening. The bottom wall of the internal air supply main pipe 3 has a through groove adapted to the open top opening of the internal air supply increment branch pipe 4. The inner cavity of 3 is connected to the inner cavity of the inner air supply increment branch pipe 4 through a through groove and an open opening. Multiple sets of second air supply ports 401 are opened at intervals along the length direction on both the left and right side walls of the inner air supply increment branch pipe 4. The air outlet direction of the second air supply ports 401 is inclined downward. The hot air in the inner air supply increment branch pipe 4 is blown out towards the inner walls of both sides of the curing furnace body 1 at an inclined downward direction, so that the hot air can flow from the middle to both sides, effectively covering the corner area of ​​the top of the curing furnace body 1, eliminating the circulation dead corner at the top of the furnace body, and reducing the temperature difference between different areas inside the furnace body.

[0028] Preferably, the inner return air main pipe 5 is a rectangular square tube structure, and the first return air inlet 501 is respectively provided on the two side walls of the inner return air main pipe 5. The return air direction of the first return air inlet 501 is horizontal and away from the inner side wall of the curing furnace body 1. The inner return air increment branch pipe 6 is a trapezoidal pipe structure that is narrow at the top and wide at the bottom. The second return air inlet 601 is respectively provided on the two side walls of the inner return air increment branch pipe 6. The return air direction of the second return air inlet 601 is inclined downward and away from the inner side wall of the curing furnace body 1. In this embodiment, the internal return air main pipe 5 adopts a rectangular square tube structure. Multiple sets of first return air inlets 501 are spaced along the length of both the left and right side walls of the internal return air main pipe 5. The return air direction of the first return air inlets 501 extends horizontally, and the hot air inside the curing furnace 1 is drawn horizontally towards the first return air inlets 501. The internal return air increment branch pipe 6 adopts a trapezoidal pipe structure that is narrower at the top and wider at the bottom. The bottom of the internal return air increment branch pipe 6 is set as an open opening, and the top wall of the internal return air main pipe 5 has an opening adapted to the open bottom of the internal return air increment branch pipe 6. The inner cavity of the inner return air increment branch pipe 6 is connected to the inner cavity of the inner return air main pipe 5 through an open opening and a through slot. Multiple sets of second return air inlets 601 are opened at intervals along the length direction on both the left and right side walls of the inner return air increment branch pipe 6. The return air direction of the second return air inlets 601 is inclined downward. The hot air in the curing furnace body 1 is drawn into the second return air inlets 601 inclined downward, so that the hot air at the bottom of the furnace body flows from both sides to the middle, eliminating the circulation dead zone at the bottom of the furnace body and forming a stable hot air circulation flow field in the curing furnace body 1.

[0029] Preferably, the first air supply outlet 301 and the second air supply outlet 401 are arranged in a staggered manner in the vertical direction, and the first return air outlet 501 and the second return air outlet 601 are also arranged in a staggered manner in the vertical direction. In this embodiment, as... Figure 4As shown, the first air outlet 301 and the second air outlet 401 are staggered in the vertical direction, which significantly increases the density of hot air flow on the side of the curing oven body 1 away from the output end of the external circulation air supply component 2. This can effectively supplement the air supply volume in the far-end area of ​​the curing oven body 1 and improve the problem of insufficient heat in the far end caused by the hot air flow along the path. Similarly, the first return air outlet 501 and the second return air outlet 601 are staggered in the vertical direction, which can fully draw the residual hot air flow in the far-end area of ​​the curing oven body 1, enhance the hot air circulation effect in the far end, and improve the hot air circulation efficiency and heat utilization rate.

[0030] Preferably, the curing furnace body 1 includes a small-cavity furnace section 101, a transition furnace section 102, and a large-cavity furnace section 103 connected in sequence. An external circulation air supply assembly 2 is disposed outside the small-cavity furnace section 101, and internal air supply increment branch pipes 4 and 6 are disposed inside the transition furnace section 102 and the large-cavity furnace section 103. In this embodiment, the curing furnace body 1 has three interconnected cavities, namely the small-cavity furnace section 101, the transition furnace section 102, and the large-cavity furnace section 103, wherein the external circulation air supply assembly 2 is entirely installed outside the small-cavity furnace section 101. Figure 2 As shown, to accommodate the larger cavities inside the transition furnace section 102 and the large-capacity furnace section 103, both the internal air supply main pipe 3 and the internal return air main pipe 5 are bent into front and rear pipe sections. The front pipe section of the internal air supply main pipe 3 and the internal return air main pipe 5 extends from the small-capacity furnace section 101 into the transition furnace section 102, and the rear pipe section of the internal air supply main pipe 3 and the internal return air main pipe 5 extends from the transition furnace section 102 into the large-capacity furnace section 103. The internal air supply increment branch pipe 4 is installed at the bottom of the rear pipe section of the internal air supply main pipe 3, and the internal return air increment branch pipe 6 is installed... At the top of the rear section of the internal return air main pipe 5, a "normal air supply zone" and a "normal return air zone" are formed inside the curing furnace body 1 on the side close to the external circulation air supply component 2, and a "strong air supply zone" and a "strong return air zone" on the side away from the external circulation air supply component 2. In the preset areas where the temperature is prone to be low at the far end (transition furnace section 102 and large cavity furnace section 103), the temperature uniformity in the small cavity furnace section 101, transition furnace section 102 and large cavity furnace section 103 can be significantly improved by the cooperation of the "strong air supply zone" and the "strong return air zone".

[0031] Preferably, the top inner wall of the curing furnace body 1 is provided with a workpiece hoisting conveyor line 7. The workpiece hoisting conveyor line 7 includes a feeding conveyor section 701, a rotary conveyor section 702, and a discharging conveyor section 703 connected in sequence. The feeding conveyor section 701 extends along the small-cavity furnace section 101 and the transition furnace section 102 into the large-cavity furnace section 103. The rotary conveyor section 702 is located within the large-cavity furnace section 103 and forms a 180° turnaround path. The discharging conveyor section 703 extends along the transition furnace section 102 and the small-cavity furnace section 101 outwards. In this embodiment, as... Figure 3As shown, a workpiece hoisting conveyor line 7 is installed on the inner wall of the top of the curing furnace body 1, including a feeding conveyor section 701, a rotary conveyor section 702, and a discharging conveyor section 703 connected sequentially along the conveying direction of the workpiece 100. The feeding conveyor section 701 is located within the small-cavity furnace section 101 and the transition furnace section 102, the rotary conveyor section 702 is located within the large-cavity furnace section 103, and the discharging conveyor section 703 is located within the transition furnace section 102 and the small-cavity furnace section 101, forming a U-shaped zigzag conveying trajectory. The workpiece 100 after being sprayed with electrostatic powder... Suspended on the workpiece hoisting conveyor line 7, the workpiece 100 passes sequentially through the small cavity furnace section 101, the transition furnace section 102, the large cavity furnace section 103, the transition furnace section 102, and the small cavity furnace section 101 within the curing furnace body 1. This effectively extends the high-temperature curing time of the workpiece 100. Moreover, the temperature uniformity within the small cavity furnace section 101, the transition furnace section 102, and the large cavity furnace section 103 is good, ensuring that each workpiece 100 undergoes the same thermal process, allowing the electrostatic powder coating to fully cure and improving product quality consistency.

[0032] The above description is merely a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An energy-saving hot air circulating electrostatic powder curing oven, characterized in that, include: Curing furnace body (1); An external circulation air supply component (2) is disposed outside the curing furnace body (1) to increase the temperature of the hot air and drive the hot air to circulate. An internal air supply main pipe (3) is located inside the curing furnace body (1). The output end of the external circulation air supply component (2) is connected to the input end of the internal air supply main pipe (3). Several sets of first air supply ports (301) are spaced apart along the length direction on the internal air supply main pipe (3). An internal air supply increment branch pipe (4) is located inside the curing furnace body (1) on the side away from the output end of the external circulation air supply component (2). The internal air supply increment branch pipe (4) is connected to the internal air supply main pipe (3). Several sets of second air supply ports (401) are spaced apart along the length direction on the internal air supply increment branch pipe (4). An internal return air main pipe (5) is located inside the curing furnace body (1). The output end of the internal return air main pipe (5) is connected to the input end of the external circulation air supply component (2). Several sets of first return air inlets (501) are spaced apart along the length direction on the internal return air main pipe (5). An internal return air increment branch pipe (6) is located inside the curing furnace body (1) on the side away from the input end of the external circulation air supply component (2). The internal return air increment branch pipe (6) is connected to the internal return air main pipe (5). Several sets of second return air inlets (601) are spaced apart along the length direction on the internal return air increment branch pipe (6).

2. The energy-saving hot air circulating electrostatic powder curing oven according to claim 1, characterized in that, The external circulation air supply assembly (2) includes a heat exchange device (201), an air supply fan (202), and an external air supply duct (203) connected in sequence. The output end of the internal return air main duct (5) is connected to the input end of the heat exchange device (201), and the output end of the external air supply duct (203) is connected to the input end of the internal air supply main duct (3).

3. The energy-saving hot air circulating electrostatic powder curing oven according to claim 2, characterized in that, The internal air supply main pipe (3) is installed on the top inner wall of the curing furnace body (1), and the internal air supply increment branch pipe (4) is installed at the bottom of the internal air supply main pipe (3). The internal return air main pipe (5) is installed on the bottom inner wall of the curing furnace body (1), and the internal return air increment branch pipe (6) is installed on the top of the internal return air main pipe (5).

4. The energy-saving hot air circulating electrostatic powder curing oven according to claim 3, characterized in that, The internal air supply main pipe (3) is a rectangular square tube structure. The first air outlet (301) is respectively located on the two side walls of the internal air supply main pipe (3). The air supply direction of the first air outlet (301) is horizontally facing the inner side wall of the curing furnace body (1). The internal air supply increment branch pipe (4) is a trapezoidal pipe structure that is wider at the top and narrower at the bottom. The second air outlet (401) is respectively located on the two side walls of the internal air supply increment branch pipe (4). The air supply direction of the second air outlet (401) is inclined downward toward the inner side wall of the curing furnace body (1).

5. The energy-saving hot air circulating electrostatic powder curing oven according to claim 4, characterized in that, The internal return air main pipe (5) is a rectangular square tube structure. The first return air inlet (501) is respectively located on the two side walls of the internal return air main pipe (5). The return air direction of the first return air inlet (501) is horizontally away from the inner side wall of the curing furnace body (1). The inner return air increment branch pipe (6) is a trapezoidal pipe structure that is narrow at the top and wide at the bottom. The second return air inlet (601) is respectively located on the two side walls of the inner return air increment branch pipe (6). The return air direction of the second return air inlet (601) is inclined downward and away from the inner side wall of the curing furnace body (1).

6. The energy-saving hot air circulating electrostatic powder curing oven according to claim 5, characterized in that, The first air supply outlet (301) and the second air supply outlet (401) are arranged in an alternating manner in the vertical direction, and the first return air outlet (501) and the second return air outlet (601) are arranged in an alternating manner in the vertical direction.

7. The energy-saving hot air circulating electrostatic powder curing oven according to claim 1, characterized in that, The curing furnace body (1) includes a small cavity furnace section (101), a transition furnace section (102) and a large cavity furnace section (103) connected in sequence. The external circulation air supply assembly (2) is located outside the small cavity furnace section (101), and the internal air supply increment branch pipe (4) and the internal return air increment branch pipe (6) are located inside the transition furnace section (102) and the large cavity furnace section (103).

8. The energy-saving hot air circulating electrostatic powder curing oven according to claim 7, characterized in that, The top inner wall of the curing furnace body (1) is provided with a workpiece hoisting conveyor line (7). The workpiece hoisting conveyor line (7) includes a feeding conveyor section (701), a rotary conveyor section (702), and a discharging conveyor section (703) connected in sequence. The feeding conveyor section (701) extends along the small cavity furnace section (101) and the transition furnace section (102) into the large cavity furnace section (103). The rotary conveyor section (702) is located in the large cavity furnace section (103) and forms a 180° turnaround path. The discharging conveyor section (703) extends along the transition furnace section (102) and the small cavity furnace section (101) to the outside.

Images