A thermal spraying device capable of reducing VOC in coatings

Abstract

This invention discloses a thermal spraying device for reducing VOCs in coatings, comprising a spray pipe, a nozzle, and a rectifier box. A heating device is fixed to the spray pipe, and a nozzle is fixed to the end of the spray pipe. A sliding plate is slidably connected to the spray pipe, and a first spring is sleeved on the spray pipe. Flow guide boxes are symmetrically arranged at the front end of the nozzle, with sliding grooves on both the upper and lower sides of each flow guide box. Two limiting sliding rods are arranged parallel to each other on the upper and lower sides of the flow guide box, with a support rod fixedly connected to the left end of each limiting sliding rod and the support rod fixedly connected to the nozzle. A second spring is arranged on the left side of the flow guide box, and an adjusting plate is slidably connected to the flow guide box. The left end of the adjusting plate is fixedly connected to the sliding plate. The heating device heats the spray pipe, and by utilizing the effect of temperature on the shape memory metal material, the first and second springs extend upon heating, adjusting the air intake of the flow guide box, thereby adjusting the airflow rate, the thermal spraying rate, and the coating cooling rate.

Description

Technical Field

[0001] This invention belongs to the field of coating spraying technology, and specifically relates to a thermal spraying device that can reduce VOCs in coatings. Background Technology

[0002] VOC is the abbreviation for Volatile Organic Compounds, which have a significant impact on human health. When using solvent-based coatings for spraying, organic solvents are added to dilute the coating to reduce its viscosity. To achieve the required viscosity, a large amount of thinner is often needed. Heated spraying, on the other hand, involves heating the coating and maintaining it at a high temperature to significantly reduce its viscosity, then applying it via atomization using methods such as air spraying, high-pressure airless spraying, or electrostatic spraying. The viscosity of the coating often changes significantly when heated to a higher temperature. Compared to ordinary spraying, heated spraying requires far less thinner to achieve the same viscosity, thus reducing VOC emissions. Thermal spraying not only reduces coating viscosity but also ensures viscosity stability, maintaining consistent coating quality over time. However, the spraying temperature during thermal spraying has a significant impact on the coating effect. Failure to properly control the nozzle temperature can greatly affect the coating quality. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a thermal spraying device that can effectively control the spraying temperature and reduce the VOC of the coating, so as to solve the above problems.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a thermal spraying device for reducing VOCs in coatings, comprising a spray pipe, a nozzle, and a rectifier box. A heating device is fixed on the spray pipe, and a nozzle is fixed at the end of the spray pipe. A sliding plate is slidably connected to the spray pipe, and a first spring is sleeved on the spray pipe. One end of the first spring is fixedly connected to the nozzle, and the other end of the first spring is fixedly connected to the sliding plate. A guide box is symmetrically arranged at the front end of the nozzle. Sliding grooves are provided on both the upper and lower sides of the guide box, and two limiting sliding rods are arranged parallel to each other on the upper and lower sides of the guide box. A support rod is fixedly connected to the left end of the limiting sliding rod, and the support rod is fixedly connected to the nozzle. A second spring is arranged on the left side of the guide box. One end of the second spring is fixedly connected to the guide box, and the other end of the second spring is fixedly connected to the support rod. An adjusting plate is slidably connected to the guide box, and the left end of the adjusting plate is fixedly connected to the sliding plate.

[0005] Preferably, both the first spring and the second spring are made of shape memory metal.

[0006] Preferably, an air pump is installed on the nozzle, and a connecting port is provided on the flow guide box. The connecting port is connected to the air inlet of the air pump through a hose, and the exhaust port of the air pump leads to the inside of the nozzle.

[0007] Preferably, the flow guide box has evenly distributed vent holes on the side leading to the nozzle, which facilitates the entry of outside air into the flow guide box.

[0008] The beneficial effects of this invention are as follows: This invention heats the nozzle using a heating device. Outside air enters the nozzle through the guide box and mixes with the coating material before atomization. When the air pump draws outside air from the guide box, and the heating device continuously heats the nozzle to an excessively high temperature, the first spring, due to the characteristics of shape memory metal, elongates from a low-temperature phase to a high-temperature phase, pushing the sliding plate to the left. This causes the adjusting plate to slide to the left, increasing the number of vent holes and connecting ports on the guide box, thus increasing the air intake of the guide box and accelerating the amount of air entering the nozzle. This speeds up the thermal spraying of the nozzle and, on the other hand, accelerates the spraying process. The airflow rate at the nozzle accelerates the cooling efficiency of the coating. Similarly, during thermal spraying, the coating sprayed from the nozzle raises the temperature near the right end of the nozzle. When the second spring is heated, it elongates due to the properties of the shape memory metal, transitioning from a low-temperature phase to a high-temperature phase. This pushes the guide box to slide to the right, increasing the number of vents and connecting ports on the guide box and increasing the air intake of the guide box. By utilizing the effect of temperature on the shape memory metal material, the first and second springs elongate after being heated, adjusting the air intake of the guide box, thereby adjusting the airflow rate, the thermal spraying rate, and the coating cooling rate. Attached Figure Description

[0009] Figure 1 This is a top view of the main structure of the present invention;

[0010] Figure 2 This is a structural diagram of the flow guide box of the present invention.

[0011] The following numbers are labeled in the diagram: 1. Nozzle; 2. Nozzle head; 3. Flow guide box; 301. Slide groove; 302. Connecting port; 4. Heating device; 5. Slide plate; 6. First spring; 7. Air pump; 8. Support rod; 9. Limiting slide rod; 10. Second spring; 11. Adjusting plate. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0013] like Figure 1-2As shown, a thermal spraying device for reducing VOCs in coatings includes a spray pipe 1, a nozzle 2, and a rectifier box 3. A heating device 4 is fixed on the spray pipe 1, and a nozzle 2 is fixed to the end of the spray pipe 1. A sliding plate 5 is slidably connected to the spray pipe 1, and a first spring 6 is sleeved on the spray pipe 1. One end of the first spring 6 is fixedly connected to the nozzle 2, and the other end of the first spring 6 is fixedly connected to the sliding plate 5. A guide box 3 is symmetrically arranged at the front end of the nozzle 2. A sliding groove 301 is provided on both the upper and lower sides of the guide box 3, and two limiting sliding rods 9 are arranged parallel to each other on the upper and lower sides of the guide box 3. A support rod 8 is fixedly connected to the left end of the limiting sliding rod 9, and the support rod 8 is fixedly connected to the nozzle 2. A second spring 10 is arranged on the left side of the guide box 3. One end of the second spring 10 is fixedly connected to the guide box 3, and the other end of the second spring 10 is fixedly connected to the support rod 8. An adjusting plate 11 is slidably connected to the guide box 3, and the left end of the adjusting plate 11 is fixedly connected to the sliding plate 5.

[0014] In this embodiment, both the first spring 6 and the second spring 10 are made of shape memory metal.

[0015] In this embodiment, an air pump 7 is installed on the nozzle 2, and a connecting port 302 is provided on the flow guide box 3. The connecting port 302 is connected to the air inlet of the air pump 7 through a hose, and the exhaust port of the air pump 7 leads to the interior of the nozzle 2.

[0016] In this embodiment, the air guide box 3 has vent holes evenly distributed on the side leading to the nozzle 2, which facilitates the entry of outside air into the air guide box 3.

[0017] The working principle of this invention is as follows: In use, the heating device 4 heats the nozzle 1, and the paint is heated inside the nozzle 1. The paint then enters the nozzle 2. When the air pump 7 is turned on, outside air enters the nozzle 2 through the guide box 3 and mixes with the paint, then atomizes. After the paint cools in the air and reaches the substrate, it quickly fuses to form a paint film. When the air pump draws outside air from the guide box 3, it accelerates the airflow speed at the nozzle 2, thus accelerating the cooling and forming speed of the paint. During the thermal spraying process, when the heating device 4 continuously heats the nozzle 1 to an excessively high temperature, the first spring 6, due to the characteristics of shape memory metal, elongates from a low-temperature phase to a high-temperature phase, pushing the slide plate 5 to the left and causing the adjusting plate 11 to slide to the left. This increases the number of vent holes and connecting ports 302 on the guide box 3, increasing the air intake of the guide box 3. On the one hand, this accelerates the amount of air entering the nozzle 2, thus speeding up the thermal spraying speed of the nozzle 2. On the other hand, it accelerates the airflow rate at the nozzle 2, thus accelerating the cooling efficiency of the paint. Similarly, during the thermal spraying process, the paint sprayed from the nozzle 2 causes the temperature at the right end of the nozzle 2 to rise. After being heated, the second spring 10 elongates due to the characteristics of the shape memory metal, which transforms from a low-temperature phase to a high-temperature phase. This pushes the guide box 3 to slide to the right, thereby increasing the number of vent holes and connecting ports 302 on the guide box 3 and increasing the air intake of the guide box 3. By utilizing the effect of temperature on the shape memory metal material, the first spring 6 and the second spring 10 elongate after being heated, adjusting the air intake of the guide box 3, thereby adjusting the air flow rate, adjusting the thermal spraying rate, and adjusting the rate of paint cooling.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal spraying device for reducing VOCs in coatings, comprising a spray pipe, a nozzle, and a rectifier box, characterized in that: A heating device is fixed on the nozzle, and a nozzle is fixed at the end of the nozzle. A sliding plate is slidably connected to the nozzle, and a first spring is sleeved on the nozzle. One end of the first spring is fixedly connected to the nozzle, and the other end of the first spring is fixedly connected to the sliding plate. A flow guide box is symmetrically arranged at the front end of the nozzle. Sliding grooves are provided on both the upper and lower sides of the flow guide box, and two limiting sliding rods are arranged parallel on the upper and lower sides of the flow guide box. A support rod is fixedly connected to the left end of the limiting sliding rod, and the support rod is fixedly connected to the nozzle. A second spring is arranged on the left side of the flow guide box. One end of the second spring is fixedly connected to the flow guide box, and the other end of the second spring is fixedly connected to the support rod. An adjusting plate is slidably connected to the flow guide box, and the left end of the adjusting plate is fixedly connected to the sliding plate. Both the first and second springs are made of shape memory metal. An air pump is installed on the nozzle, and a connecting port is provided on the flow guide box. The connecting port is connected to the air inlet of the air pump through a hose, and the exhaust port of the air pump leads to the inside of the nozzle. The flow guide box has evenly distributed air vents on the side leading to the nozzle; In use, the nozzle is heated by a heating device, and the paint is heated inside the nozzle before entering the nozzle. When the air pump is turned on, outside air enters the nozzle through the guide box, mixes with the paint, and is atomized. After cooling in the air, the paint reaches the substrate and quickly fuses to form a paint film. When the air pump draws outside air from the guide box, it increases the airflow speed at the nozzle, accelerating the cooling and forming of the paint. During thermal spraying, when the heating device continuously heats the nozzle to an excessively high temperature, the first spring, due to the properties of shape memory metal, elongates from a low-temperature phase to a high-temperature phase, pushing the sliding plate to the left. This causes the adjusting plate to slide to the left, increasing the number of vents and connecting ports on the guide box. Increasing the air intake of the guide box accelerates the amount of air entering the nozzle, thus speeding up the thermal spraying process. It also increases the airflow rate at the nozzle, improving the coating cooling efficiency. During thermal spraying, the coating sprayed from the nozzle raises the temperature at the right end of the nozzle. The second spring, heated by the shape memory metal, elongates from a low-temperature phase to a high-temperature phase, pushing the guide box to slide to the right. This increases the number of vents and connecting ports on the guide box, further increasing the air intake. By utilizing the effect of temperature on the shape memory metal, the first and second springs elongate upon heating, adjusting the air intake of the guide box, thereby regulating the airflow rate, the thermal spraying rate, and the coating cooling rate.

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