A coating line waste heat recovery device

Abstract

The utility model discloses a kind of coating line waste heat recovery devices, belong to coating line waste heat recovery technical field, including coating box, the side of the coating box is fixedly connected with filter box, the side of the coating box is fixedly connected with heat exchange box, waste heat recovery mechanism is provided on the heat exchange box, the end of the heat exchange box is fixedly connected with blowing pipe, the side of the filter box is fixedly installed with exhaust fan, the input end of the exhaust fan extends to the inner chamber of filter box. In the utility model, the suction hood is made to produce suction force by exhaust fan, and the hot air in the coating box and the paint raised are sucked into the filter cloth bag in the inner chamber of filter box, the paint is collected using the filter cloth bag, the hot air enters the inner chamber of filter box from the filter hole of filter cloth bag side, and the hot air is led out from the heat exchange box and blowing pipe, the hot air blown by blowing pipe end is used to air dry the parts after pretreatment cleaning, and the waste heat is reasonably utilized.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology in coating lines, and more specifically, to a waste heat recovery device for coating lines. Background Technology

[0002] A coating line is an industrial production line used for coating workpiece surfaces. Through core processes such as pretreatment, powder coating, and heat curing, it achieves functions such as corrosion resistance, decoration, and wear resistance. Its equipment includes automated systems for cleaning, spraying, and curing, involving technologies such as electrostatic adsorption and UV curing. Application areas cover industries such as automotive, hardware, and home appliances. During the thermal spraying process in a coating line, the coating material is heated to a molten or semi-molten state using a heat source (such as an electric arc or plasma arc), and then sprayed at high speed onto the workpiece surface to form a coating. Spraying is generally carried out in a spray booth, which makes it difficult to efficiently utilize the heat dissipated by the coating during spraying, easily leading to energy waste. Therefore, we propose a waste heat recovery device for coating lines. Utility Model Content

[0003] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a waste heat recovery device for a coating line.

[0004] To solve the above problems, the present invention adopts the following technical solution: a waste heat recovery device for a coating line, comprising a coating box, a filter box fixedly connected to the side of the coating box, a heat exchange box fixedly connected to the side of the coating box, a waste heat recovery mechanism provided on the heat exchange box, a blower pipe fixedly connected to the end of the heat exchange box, an exhaust pump fixedly installed on the side of the filter box, the input end of the exhaust pump extending into the inner cavity of the filter box, the output end of the exhaust pump fixedly sleeved into the inner cavity of the heat exchange box, a filter bag provided at the top of the inner cavity of the filter box, a guide steel pipe fixedly sleeved at the top of the filter box, a T-joint fixedly sleeved at the end of the guide steel pipe, suction steel pipes fixedly sleeved at both ends of the T-joint, suction hoods fixedly connected to the ends of the two suction steel pipes, and suction hoods fixedly sleeved at the ends of the two suction hoods fixedly sleeved into the inner cavity of the coating box.

[0005] As a preferred embodiment of this utility model, the waste heat recovery mechanism includes multiple heat exchange tubes fixedly sleeved in the inner cavity of the heat exchange box, an insulation box placed at the bottom of the heat exchange box, and multiple support columns fixedly connected to the top surface of the heat exchange box. A water storage tank is fixedly connected to the top surface of the multiple support columns. Multiple upper electrically controlled valves are fixedly installed on the bottom surface of the water storage tank. The top ends of the upper electrically controlled valves extend into the inner cavity of the water storage tank. The bottom ends of the multiple upper electrically controlled valves are fixedly sleeved into the inner cavity of the heat exchange tubes. Multiple heat exchange fins are fixedly sleeved on the side of the heat exchange tubes. A lower electrically controlled valve is fixedly installed on the bottom surface of each heat exchange tube. The bottom end of the lower electrically controlled valve is fixedly sleeved into the inner cavity of the insulation box. The top end of the lower electrically controlled valve is fixedly sleeved into the inner cavity of the heat exchange tube. A temperature sensor is provided at the bottom of the inner cavity of each heat exchange tube.

[0006] As a preferred embodiment of this utility model, a sealing door is hinged to the outside of the filter box, and a controller is fixedly installed on the outside of the sealing door. The controller is electrically connected to the exhaust pump, the upper solenoid valve, the lower solenoid valve, and the temperature sensor.

[0007] As a preferred embodiment of this utility model, an external threaded ring is provided at the top of the inner cavity of the filter box, and an internal threaded cover is fixedly connected to the top of the filter bag, with the internal threaded cover threaded onto the outside of the external threaded ring.

[0008] As a preferred embodiment of this utility model, a threaded plug is threadedly installed on the top of the water storage tank, and the bottom end of the threaded plug extends into the inner cavity of the water storage tank.

[0009] As a preferred embodiment of this utility model, a drain valve is fixedly installed on the side of the insulation box, and the end of the drain valve extends into the inner cavity of the insulation box.

[0010] The advantages of this utility model are: (1) In this utility model, the suction pump is used to generate suction force to draw the hot air and the raised paint from the inner cavity of the coating box into the filter bag in the inner cavity of the filter box. The paint is collected by the filter bag. The hot air enters the inner cavity of the filter box from the filter hole on the side of the filter bag and is discharged from the heat exchange box and the blower pipe. The hot air blown out from the end of the blower pipe is used to dry the pre-treated and cleaned parts, and the residual heat is rationally utilized.

[0011] (2) In this utility model, when hot air flows in the inner cavity of the heat exchange box, the heat in the hot air exchanges heat with the water in the inner cavity of the heat exchange tube, thereby realizing the recovery of waste heat. In addition, when the temperature sensor detects that the temperature in the inner cavity of the heat exchange tube reaches the predetermined heating temperature, the hot water in the inner cavity of the heat exchange tube is introduced into the heat preservation box for heat preservation and storage using the lower solenoid valve, and the cold water in the inner cavity of the water storage tank is added to the heat exchange tube to continue the heat exchange and recovery using the upper solenoid valve. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 is a schematic diagram of the structure of the filter box of this utility model.

[0014] Figure 3 is a schematic diagram of the internal structure of the filter box of this utility model.

[0015] Figure 4 is a schematic diagram showing the disassembly of the filter box and filter bag of this utility model.

[0016] Figure 5 is a cross-sectional schematic diagram of the heat exchange tube of this utility model.

[0017] The following are the labels in the diagram: 1. Coating box; 2. Filter box; 3. Air guide pipe; 4. T-joint; 5. Suction pipe; 6. Suction hood; 7. Exhaust pump; 8. Heat exchange box; 9. Waste heat recovery mechanism; 10. Air blowing pipe; 11. Filter bag; 12. Insulation box; 13. Support column; 14. Heat exchange tube; 15. Heat exchange fins; 16. Water storage tank; 17. Upper solenoid valve; 18. Lower solenoid valve; 19. Threaded plug; 20. Drain valve; 21. Temperature sensor; 22. External threaded ring; 23. Internal threaded cap; 24. Sealing door; 25. Controller. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0021] As shown in Figures 1 to 5, a waste heat recovery device for a coating line includes a coating box 1. The coating box 1 is equipped with a device for thermal spraying of parts and a conveyor belt for transporting parts (this is prior art and will not be described in detail). A filter box 2 is fixedly connected to the side of the coating box 1, and a heat exchange box 8 is fixedly connected to the side of the coating box 1. A waste heat recovery mechanism 9 is provided on the heat exchange box 8. A blower pipe 10 is fixedly connected to the end of the heat exchange box 8, extending to the cleaned parts to dry them with hot air. A suction pump 7 is fixedly installed on the side of the filter box 2. The input end of the suction pump 7 extends into the inner cavity of the filter box 2, and the output end of the suction pump 7 is fixedly sleeved into the inner cavity of the heat exchange box 8. A filter bag 11 is provided at the top of the inner cavity of the filter box 2, and a guide steel pipe 3 is fixedly sleeved on the top of the filter box 2. The end of the filter bag 11 is fixedly fitted with a three-way connector 4. The two ends of the three-way connector 4 are respectively fixedly fitted with suction steel pipes 5. The ends of the two suction steel pipes 5 are respectively fixedly connected with suction hoods 6. The ends of the two suction hoods 6 are respectively fixedly fitted into the inner cavity of the coating box 1. The top of the inner cavity of the filter box 2 is provided with an external threaded ring 22. The top of the filter bag 11 is fixedly connected with an internal threaded cap 23. The internal threaded cap 23 is threaded on the outside of the external threaded ring 22. The filter bag 11 is installed in the inner cavity of the filter box 2 through the cooperation of the external threaded ring 22 and the internal threaded cap 23. At the same time, the filter bag 11 can be removed to process the collected paint. Example 2

[0022] Based on Embodiment 1, as shown in Figures 1 to 5, the waste heat recovery mechanism 9 includes multiple heat exchange tubes 14 fixedly sleeved inside the heat exchange box 8, an insulation box 12 placed at the bottom of the heat exchange box 8, and multiple support columns 13 fixedly connected to the top surface of the heat exchange box 8. A water storage tank 16 is fixedly connected to the top surface of the multiple support columns 13. Multiple upper solenoid valves 17 are fixedly installed on the bottom surface of the water storage tank 16. The top ends of the upper solenoid valves 17 extend into the inner cavity of the water storage tank 16, and the bottom ends of the multiple upper solenoid valves 17 are fixedly sleeved into the inner cavity of the heat exchange tubes 14. Multiple heat exchange fins 15 are fixedly sleeved on the side of the heat exchange tubes 14. Lower solenoid valves 18 are fixedly installed on the bottom surface of each heat exchange tube 14. The bottom end of the valve is fixedly sleeved to the inner cavity of the heat exchange tube 14, and the top end of the lower electric control valve 18 is fixedly sleeved to the inner cavity of the heat exchange tube 14. Temperature sensors 21 are provided at the bottom of the inner cavity of the heat exchange tube 14. A threaded plug 19 is threadedly installed on the top of the water storage tank 16, and the bottom end of the threaded plug 19 extends into the inner cavity of the water storage tank 16. Cold water is added to the inner cavity of the water storage tank 16 by removing the threaded plug 19. A drain valve 20 is fixedly installed on the side of the heat storage tank 12, and the end of the drain valve 20 extends into the inner cavity of the heat storage tank 12. Hot water in the inner cavity of the heat storage tank 12 is released for use by opening the drain valve 20. Example 3

[0023] Based on Embodiment 1 and Embodiment 2, as shown in Figures 2 to 5, a sealing door 24 is hinged to the outside of the filter box 2, and a sealing strip is provided between the sealing door 24 and the filter box 2. This is conventional technology. A controller 25 is fixedly installed on the outside of the sealing door 24. The controller 25 is electrically connected to the exhaust pump 7, the upper solenoid valve 17, the lower solenoid valve 18, and the temperature sensor 21, respectively. The controller 25 controls the exhaust pump 7, the upper solenoid valve 17, the lower solenoid valve 18, and the temperature sensor 21. At the same time, the controller 25 processes the information detected by the temperature sensor 21. In addition, the power supply of the external device supplies power to the controller 25, the exhaust pump 7, the upper solenoid valve 17, the lower solenoid valve 18, and the temperature sensor 21. This is conventional technology.

[0024] It should be noted that this utility model is a waste heat recovery device for a coating line. In use, the parts are first thermally sprayed inside the coating box 1. Simultaneously, the exhaust pump 7 is started to draw air from the inner cavity of the filter box 2. The negative pressure inside the filter box 2 causes suction to be generated by the air guide pipe 3, the three-way connector 4, the suction pipe 5, and the suction hood 6. The suction of the suction hood 6 draws the waste heat and the stirred-up paint from the inner cavity of the coating box 1 into the filter bag 11 inside the filter box 2. The filter bag 11 collects the paint, and the hot air enters the inner cavity of the filter box 2 through the filter holes of the filter bag 11. Then, the hot air is drawn out by the exhaust pump 7. The hot air enters the inner cavity of the heat exchange box 8 and exchanges heat with the water in the inner cavity of the heat exchange tube 14, thereby recovering the heat in the hot air. The recovered hot air is sprayed from the end of the blower pipe 10 onto the parts that have been cleaned during the pretreatment, thereby drying the cleaned parts. Finally, the temperature sensor 21 in the inner cavity of the heat exchange tube 14 is used to detect the water temperature in the inner cavity of the heat exchange tube 14. When the water temperature reaches the predetermined temperature, the controller 25 first controls the lower solenoid valve 18 to open for a predetermined time, so that the hot water in the inner cavity of the heat exchange tube 14 is discharged from the lower solenoid valve 18 into the inner cavity of the insulation box 12 for storage and insulation. Then, the controller 25 controls the lower solenoid valve 18 to close, so that the upper solenoid valve 17 is opened for a predetermined time, so that the cold water in the inner cavity of the water storage tank 16 enters the inner cavity of the heat exchange tube 14, so that the water in the inner cavity of the heat exchange tube 14 can exchange heat with the hot air passing through the inner cavity of the heat exchange box 8 again.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for a coating line, comprising a coating box (1), characterized in that: A filter box (2) is fixedly connected to the side of the coating box (1), and a heat exchange box (8) is fixedly connected to the side of the coating box (1). A waste heat recovery mechanism (9) is provided on the heat exchange box (8). A blower pipe (10) is fixedly connected to the end of the heat exchange box (8). An exhaust pump (7) is fixedly installed on the side of the filter box (2). The input end of the exhaust pump (7) extends into the inner cavity of the filter box (2), and the output end of the exhaust pump (7) is fixedly sleeved to the heat exchange box (8). The filter box (2) has a filter bag (11) at the top of its inner cavity. A guide steel pipe (3) is fixedly connected to the top of the filter box (2). A three-way connector (4) is fixedly connected to the end of the guide steel pipe (3). A suction steel pipe (5) is fixedly connected to both ends of the three-way connector (4). A suction hood (6) is fixedly connected to the ends of the two suction steel pipes (5). The ends of the two suction hoods (6) are fixedly connected to the inner cavity of the coating box (1).

2. The waste heat recovery device for a coating line according to claim 1, characterized in that: The waste heat recovery mechanism (9) includes multiple heat exchange tubes (14) fixedly sleeved in the inner cavity of the heat exchange box (8), an insulation box (12) placed at the bottom of the heat exchange box (8), and multiple support columns (13) fixedly connected to the top surface of the heat exchange box (8). A water storage tank (16) is fixedly connected to the top surface of the multiple support columns (13). Multiple upper solenoid valves (17) are fixedly installed on the bottom surface of the water storage tank (16). The top of the upper solenoid valves (17) extends into the inner cavity of the water storage tank (16). The bottom end of the upper solenoid valve (17) is fixedly sleeved to the inner cavity of the heat exchange tube (14). Multiple heat exchange fins (15) are fixedly sleeved on the side of the heat exchange tube (14). A lower solenoid valve (18) is fixedly installed on the bottom surface of the heat exchange tube (14). The bottom end of the lower solenoid valve (18) is fixedly sleeved to the inner cavity of the heat insulation box (12). The top end of the lower solenoid valve (18) is fixedly sleeved to the inner cavity of the heat exchange tube (14). A temperature sensor (21) is provided at the bottom of the inner cavity of the heat exchange tube (14).

3. The waste heat recovery device for a coating line according to claim 2, characterized in that: The filter box (2) is hinged to a sealing door (24) on the outside. A controller (25) is fixedly installed on the outside of the sealing door (24). The controller (25) is electrically connected to the exhaust pump (7), the upper solenoid valve (17), the lower solenoid valve (18), and the temperature sensor (21).

4. The waste heat recovery device for a coating line according to claim 1, characterized in that: The top of the inner cavity of the filter box (2) is provided with an external threaded ring (22), and the top of the filter bag (11) is fixedly connected with an internal threaded cover (23). The internal threaded cover (23) is threadedly installed on the outside of the external threaded ring (22).

5. A waste heat recovery device for a coating line according to claim 2, characterized in that: The top of the water storage tank (16) is threaded with a threaded plug (19), the bottom end of which extends into the inner cavity of the water storage tank (16).

6. A waste heat recovery device for a coating line according to claim 2, characterized in that: A drain valve (20) is fixedly installed on the side of the heat preservation box (12), and the end of the drain valve (20) extends into the inner cavity of the heat preservation box (12).

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