Spray gun nozzle heating device on PVF spraying production line

Abstract

The utility model relates to the field of spraying, in particular to a spray gun nozzle heating device on a PVF spraying production line, which comprises an air inlet pipe, an air outlet pipe, a coil pipe, an air delivery pipe, a spray gun, a resistance wire and a power supply, the air inlet pipe is coaxially and fixedly connected to one end of the coil pipe, and the air outlet pipe is coaxially and fixedly connected to the other end of the coil pipe; the air outlet pipe is communicated with the spray gun through an air conveying pipe, the resistance wire is wound on the periphery of the coil pipe, and the two ends of the resistance wire are electrically connected to a power source. When the resistance wire is electrified, heat energy is generated, the coil is heated, the temperature of the coil is increased, compressed air enters the coil after passing through the air inlet pipe, heat exchange occurs, the temperature of the compressed air rises, the compressed air is exhausted from the air outlet pipe, passes through the air conveying pipe and finally enters a pipeline of the spray gun, the probability that the surface of a product is exposed is reduced, and the spraying operation quality is improved.

Description

Technical Field

[0001] The present application relates to the field of spraying, and particularly to a heating device for the spray gun nozzle on a PVF spraying production line. Background Art

[0002] A PVF spraying production line is a production line specifically used for spraying PVF (polyvinyl fluoride) coatings. Due to its excellent weather resistance, corrosion resistance, and good decorative properties, PVF coatings are widely used in many fields such as construction, automotive, and household appliances.

[0003] A PVF spraying production line generally includes the following main equipment and processes: pretreatment equipment, which performs pretreatment such as cleaning, degreasing, and rust removal on the substrate to be sprayed to ensure that the coating can firmly adhere to the substrate; spraying equipment, including a spray gun, a coating supply system, and a spraying chamber, etc. The coating is evenly sprayed on the surface of the substrate through the spray gun to form a uniform coating; drying equipment, which is used to dry the sprayed substrate to quickly cure the coating and improve the hardness and wear resistance of the coating; inspection equipment, which conducts quality inspection on the sprayed products to ensure that the quality of the coating meets the requirements.

[0004] In the spraying process, compressed air can be used to better atomize the coating, making the coating particles more uniform and delicate, thereby improving the spraying effect and the quality of the coating. Therefore, compressed air is introduced into the spray gun to spray the coating.

[0005] However, in the prior art, the compressed air is cold air, while the temperature of the product after forming is relatively high, and the production environment temperature of the production line is higher than the normal temperature, especially the ambient temperature around the spray gun on the production line. The temperature of the compressed air sprayed out by the spray gun is lower than the ambient temperature of the surrounding working environment, which will cause condensation on the surface of the product or the spray gun, affecting the spraying operation quality. Summary of the Utility Model

[0006] In order to improve the spraying operation quality, the present application provides a heating device for the spray gun nozzle on a PVF spraying production line.

[0007] The heating device for the spray gun nozzle on a PVF spraying production line provided by the present application adopts the following technical solution:

[0008] A heating device for the spray gun nozzle on a PVF spraying production line includes an air inlet pipe, an air outlet pipe, a coil pipe, an air delivery pipe, a spray gun, a resistance wire, and a power supply. The air inlet pipe is coaxially and fixedly connected to one end of the coil pipe, the air outlet pipe is coaxially and fixedly connected to the other end of the coil pipe, the air outlet pipe is connected to the spray gun through the air delivery pipe, the resistance wire is wound around the outer periphery of the coil pipe, and both ends of the resistance wire are electrically connected to the power supply.

[0009] By adopting the above technical solution, the resistance wire will generate heat energy when it is energized, heating the coil and increasing the coil temperature. The compressed air enters the coil through the air inlet pipe, heat exchange occurs, and the compressed air temperature rises. The compressed air is discharged from the air outlet pipe and passes through the air supply pipe, and finally enters the pipeline of the spray gun, reducing the probability of product surface exposure and improving the quality of spraying operations.

[0010] Preferably, it also includes a protective shell and a bracket, the protective shell is provided with a accommodating cavity, the protective shell is provided with a pipe inlet and a pipe outlet, the pipe inlet and the pipe outlet are both connected to the accommodating cavity, the bracket is fixedly connected to the bottom wall of the accommodating cavity, the upper end of the bracket is used to support the coil, the air inlet pipe is coaxially fixedly connected to the inner wall of the pipe inlet, and the air outlet pipe is coaxially fixedly connected to the inner wall of the pipe outlet.

[0011] By adopting the above technical solution, the coil is placed in a protective shell, which reduces the probability of operators being injured due to accidental touch. In addition, the protective shell can reduce heat loss and reduce resource waste.

[0012] Preferably, the protective shell is provided with a through opening, the through opening is connected to the accommodating cavity, the through opening is used for allowing the resistance wire to pass through, and the power supply is arranged on the outer periphery of the protective shell.

[0013] By adopting the above technical solution, the resistance wire is connected to the power supply after passing through the through hole. The temperature inside the protective shell is higher, and the power supply is outside the protective shell, so that the power supply is at a lower temperature, thereby extending the service life of the power supply.

[0014] Preferably, it also includes an air pump, the air outlet pipe is coaxially fixedly connected to the inner wall of the air inlet of the air pump, and the air outlet of the air pump is connected to the air supply pipe.

[0015] By adopting the above technical solution, the air pump draws air so that the gas flows into the air pipe, thereby supplying air to the spray gun and facilitating the control of gas flow.

[0016] Preferably, it also includes a steam drum and a connecting pipe, the steam drum is provided with a feed inlet, one end of the connecting pipe is connected to the air outlet of the air pump, the other end of the connecting pipe is coaxially fixedly connected to the inner wall of the feed inlet, the steam drum is provided with a discharge port, and one end of the gas pipe is coaxially fixedly connected to the inner wall of the discharge port.

[0017] By adopting the above technical solution, a steam drum is used to separate steam and water, purify the compressed air, and make the compressed air entering the spray gun free of moisture, thereby improving the quality of the spraying operation.

[0018] Preferably, there are a plurality of discharge ports, which are arranged at intervals along the length direction of the drum, and there are a plurality of gas pipes, which are arranged in one-to-one correspondence with the discharge ports.

[0019] By adopting the above technical solution, the use of a steam drum makes it easy to evenly distribute compressed air to multiple air pipes, thereby facilitating air supply to the spray gun and improving the quality of the spraying operation.

[0020] Preferably, the steam drum is provided in plurality, the connecting pipe is provided in plurality, and the connecting pipes are arranged in one-to-one correspondence with the steam drums.

[0021] By adopting the above technical solution, multiple steam drums can easily supply gas to multiple spray guns, which is convenient for users to use.

[0022] Preferably, it further comprises a controller, wherein the controller is electrically connected to a power source.

[0023] By adopting the above technical solution, the power supply is controlled by the controller, so that the coil temperature can be adjusted conveniently.

[0024] Preferably, it also includes a temperature sensor, which is connected to the inner wall of the accommodating cavity, and is used to detect the temperature of the accommodating cavity, and the temperature sensor is electrically connected to the controller.

[0025] By adopting the above technical solution, a temperature sensor is used to detect the temperature in the accommodation cavity, and the detection value is sent to a controller, which is used to control the power supply after analysis and processing by the controller to adjust the coil temperature.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the resistance wire is energized, it will generate heat energy, heat the coil, increase the coil temperature, and the compressed air will enter the coil through the air inlet pipe, heat exchange will occur, and the compressed air temperature will rise. After being discharged from the air outlet pipe, the compressed air will pass through the air supply pipe and finally enter the pipeline of the spray gun, reducing the probability of product surface exposure and improving the quality of spraying operation;

[0028] 2. The coil is placed in a protective shell to reduce the probability of operators being injured by accidental touch. In addition, the protective shell can reduce heat loss and waste of resources;

[0029] 3. The use of a steam drum facilitates the separation of steam and water and purifies the compressed air, so that the compressed air entering the spray gun does not contain moisture, thereby improving the quality of the spraying operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a schematic diagram of the overall structure of a spray gun nozzle heating device on a PVF spraying production line.

[0031] Figure 2 It is a schematic diagram of the internal structure of a spray gun nozzle heating device on a PVF spraying production line after being cut open.

[0032] Description of the reference numerals: 1. protective shell; 11. accommodation cavity; 12. inlet pipe opening; 13. outlet pipe opening; 14. through opening; 2. support; 3. heating element; 31. coil pipe; 32. inlet air pipe; 33. outlet air pipe; 34. resistance wire; 35. power supply; 4. spraying component; 41. support leg; 42. spraying chamber; 421. spraying cavity; 43. spray gun; 44. air pump; 45. steam drum; 451. feed inlet; 452. discharge outlet; 46. connecting pipe; 47. air delivery pipe; 5. control component; 51. controller; 52. temperature sensor. Detailed implementation manners

[0033] The following further describes the present application in detail with reference to Figure 1-2 the accompanying drawings.

[0034] An embodiment of the present application discloses a heating device for a spray gun nozzle on a PVF spraying production line. Referring to Figure 1 and Figure 2 , a heating device for a spray gun nozzle on a PVF spraying production line includes a protective shell 1, a support 2, a heating element 3, a spraying component 4 and a control component 5. The heating element 3 includes a coil pipe 31, an inlet air pipe 32, an outlet air pipe 33, a resistance wire 34 and a power supply 35.

[0035] Referring to Figure 1 and Figure 2 , the protective shell 1 is provided with an accommodation cavity 11. The two ends of the protective shell 1 are respectively provided with an inlet pipe opening 12 and an outlet pipe opening 13. The inlet pipe opening 12 and the outlet pipe opening 13 are both communicated with the accommodation cavity 11. The support 2 is fixedly connected to the bottom wall of the accommodation cavity 11. The upper end of the support 2 is used for supporting the coil pipe 31.

[0036] The inlet air pipe 32 is coaxially and fixedly connected to one end of the coil pipe 31. The outlet air pipe 33 is coaxially and fixedly connected to the other end of the coil pipe 31. The inlet air pipe 32 is coaxially and fixedly connected to the inner wall of the inlet pipe opening 12. The outlet air pipe 33 is coaxially and fixedly connected to the inner wall of the outlet pipe opening 13.

[0037] Referring to Figure 2 , the resistance wire 34 is wound around the outer wall of the coil pipe 31 in multiple turns along the extending direction of the coil pipe 31. A through opening 14 is provided on one side of the protective shell 1. The through opening 14 is communicated with the accommodation cavity 11. The through opening 14 is used for allowing both ends of the resistance wire 34 to pass through. The power supply 35 is arranged on the outer periphery of the protective shell 1. The power supply 35 is arranged close to the through opening 14. The power supply 35 is fixedly connected to the ground. Both ends of the resistance wire 34 are electrically connected to the power supply 35.

[0038] Referring to Figure 1 , the spraying component 4 is arranged on the side of the power supply 35 away from the protective shell 1. The spraying component 4 includes a support leg 41, a spraying chamber 42, a spray gun 43, an air pump 44, a steam drum 45, a connecting pipe 46 and an air delivery pipe 47.

[0039] The lower end of the support leg 41 is fixedly connected to the ground, and the upper end of the support leg 41 is fixedly connected to the lower end of the spraying chamber 42. There are four support legs 41, and the four support legs 41 are respectively close to the four corners of the spraying chamber 42. The spraying chamber 42 is provided with a spraying cavity 421, and the spray gun 43 is fixedly connected to the inner wall of the spraying cavity 421. The length direction of the spraying chamber 42 is parallel to the length direction of the protective shell 1.

[0040] Referring to Figure 1 and Figure 2 , the air pump 44 is fixedly connected to the ground, and one end of the air outlet pipe 33 far away from the coil pipe 31 is coaxially and fixedly connected to the air inlet of the air pump 44. The steam drum 45 is fixedly connected to the outer wall of the spraying chamber 42. There are two steam drums 45, and the two steam drums 45 are respectively arranged close to the two ends of the spraying chamber 42. The length direction of the steam drum 45 is parallel to the width direction of the spraying chamber 42. One end of the steam drum 45 facing the protective shell 1 is provided with a feed inlet 451. One end of the connecting pipe 46 communicates with the air outlet of the air pump 44, and the other end of the connecting pipe 46 is coaxially and fixedly connected to the inner wall of the feed inlet 451. There are two connecting pipes 46, and the connecting pipes 46 are arranged in one-to-one correspondence with the steam drums 45.

[0041] Referring to Figure 1 , the upper end of the steam drum 45 is provided with a discharge outlet 452. There are four discharge outlets 452, and the four discharge outlets 452 are evenly spaced along the length direction of the steam drum 45. The length direction of the steam drum 45 is parallel to the width direction of the spraying chamber 42. There are four gas transmission pipes 47, and the gas transmission pipes 47 are arranged in one-to-one correspondence with the discharge outlets 452. There are four spray guns 43, and the spray guns 43 are arranged in one-to-one correspondence with the gas transmission pipes 47. The lower end of the gas transmission pipe 47 is coaxially and fixedly connected to the inner wall of the discharge outlet 452, and the upper end of the gas transmission pipe 47 communicates with the spray gun 43.

[0042] Referring to Figure 1 and Figure 2 , the control member 5 includes a controller 51 and a temperature sensor 52. The controller 51 is arranged on the side of the protective shell 1 far away from the spraying chamber 42. The controller 51 is electrically connected to the power supply 35. The temperature sensor 52 is fixedly connected to the inner wall of the accommodation cavity 11. The temperature sensor 52 is electrically connected to the controller 51. The temperature sensor 52 is used to detect the temperature of the accommodation cavity 11 and send the detected value to the controller 51. The controller 51 is used to analyze the data to control the opening and closing of the power supply 35, and further control the temperature of the coil pipe 31.

[0043] The implementation principle of the spray gun nozzle heating device on a PVF spraying production line in an embodiment of the present application is as follows: The control member 5 controls the opening and closing of the power supply 35. When the resistance wire 34 is energized, the heating coil pipe 31 is heated, and the compressed air is heated through heat exchange after passing through the coil pipe 31. The air pump 44 extracts the heated compressed air, which is processed by the steam drum 45 and then distributed to the gas transmission pipes 47, and then enters the pipeline of the spray gun 43. The paint sprayed by the spray gun 43 has a higher temperature and is not prone to condensation, improving the quality of the spraying operation.

[0044] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A spray gun nozzle heating device on a PVF spraying production line, characterized in that: The invention comprises an air inlet pipe (32), an air outlet pipe (33), a coil (31), an air supply pipe (47), a spray gun (43), a resistance wire (34) and a power source (35), wherein the air inlet pipe (32) is coaxially fixedly connected to one end of the coil (31), the air outlet pipe (33) is coaxially fixedly connected to the other end of the coil (31), the air outlet pipe (33) is connected to the spray gun (43) via the air supply pipe (47), the resistance wire (34) is wound around the outer circumference of the coil (31), and both ends of the resistance wire (34) are electrically connected to the power source (35).

2. The spray gun nozzle heating device on a PVF spraying production line according to claim 1 is characterized in that: The invention also comprises a protective shell (1) and a bracket (2), wherein the protective shell (1) is provided with a containing cavity (11), the protective shell (1) is provided with a pipe inlet (12) and a pipe outlet (13), the pipe inlet (12) and the pipe outlet (13) are both connected to the containing cavity (11), the bracket (2) is fixedly connected to the bottom wall of the containing cavity (11), the upper end of the bracket (2) is used to support the coil (31), the air inlet pipe (32) is coaxially fixedly connected to the inner wall of the pipe inlet (12), and the air outlet pipe (33) is coaxially fixedly connected to the inner wall of the pipe outlet (13).

3. The spray gun nozzle heating device on a PVF spraying production line according to claim 2 is characterized in that: The protective shell (1) is provided with a through opening (14), the through opening (14) being connected to the accommodating cavity (11), the through opening (14) being used for allowing the resistance wire (34) to pass through, and the power source (35) is arranged on the outer periphery of the protective shell (1).

4. The spray gun nozzle heating device on a PVF spraying production line according to claim 1 is characterized in that: It also includes an air pump (44), the air outlet pipe (33) is coaxially fixedly connected to the inner wall of the air inlet of the air pump (44), and the air outlet of the air pump (44) is connected to the air delivery pipe (47).

5. The spray gun nozzle heating device on a PVF spraying production line according to claim 4 is characterized in that: The steam drum (45) further comprises a steam drum (45) and a connecting pipe (46), wherein the steam drum (45) is provided with a feed port (451), one end of the connecting pipe (46) is connected to the gas outlet of the air pump (44), and the other end of the connecting pipe (46) is coaxially fixedly connected to the inner wall of the feed port (451), the steam drum (45) is provided with a discharge port (452), and one end of the gas transmission pipe (47) is coaxially fixedly connected to the inner wall of the discharge port (452).

6. The spray gun nozzle heating device on a PVF spraying production line according to claim 5, characterized in that: There are a plurality of discharge ports (452), which are arranged at intervals along the length direction of the steam drum (45); there are a plurality of gas delivery pipes (47), which are arranged in a one-to-one correspondence with the discharge ports (452).

7. The spray gun nozzle heating device on a PVF spraying production line according to claim 5, characterized in that: A plurality of the steam drums (45) are provided, a plurality of the connecting pipes (46) are provided, and the connecting pipes (46) are arranged in a one-to-one correspondence with the steam drums (45).

8. The spray gun nozzle heating device on a PVF spraying production line according to claim 2 is characterized by: It also includes a controller (51), wherein the controller (51) is electrically connected to the power source (35).

9. The spray gun nozzle heating device on a PVF spraying production line according to claim 8, characterized in that: It also includes a temperature sensor (52), the temperature sensor (52) being connected to the inner wall of the accommodating chamber (11), the temperature sensor (52) being used to detect the temperature of the accommodating chamber (11), and the temperature sensor (52) being electrically connected to the controller (51).

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