Paint surface drying equipment

Abstract

The invention discloses paint surface drying equipment, which belongs to the field of paint surface drying equipment and is characterized in that a basic platform is constructed by an equipment bracket and a conveying belt, a drying area is isolated by a sealing cover, and accurate positioning and partitioned heating of a workpiece are realized by a built-in positioning cover structure. The drying spray pipe structure realizes'air supply-air exhaust 'alternate dynamic airflow circulation through a plurality of groups of independent pipelines, and solvent steam and moisture volatilized by a paint film are effectively taken away by combining the two-way airflow switching design of a heat preservation air pipe and a branch pipeline and the airflow guiding design of a horn-shaped air outlet, so that water vapor accumulation is avoided; and the arc dome of the positioning cover is integrated with a temperature-adjustable heating lamp tube, and is matched with a heat preservation layer and an intelligent temperature control system, so that the surface temperature of the paint film is accurately matched and uniformly heated. According to the equipment, the defects of paint film water spots, sagging and surface and interior dryness are thoroughly eliminated through a sectional type dynamic moisture removal and precise temperature control technical system, and the hardness and weather resistance of a paint film are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of paint drying equipment, and particularly relates to a paint drying equipment. BACKGROUND

[0002] The surface paint quality of the automobile bumper, as a key part of the vehicle body appearance, directly affects the appearance and weather resistance of the whole vehicle. In the paint spraying process, the drying process is a necessary link to ensure the curing of the paint film and the formation of a dense protective layer, and high-temperature baking is usually used to accelerate the cross-linking reaction of the coating. The mainstream drying process in the industry is to send the painted bumper into a closed drying chamber through a hanging chain or a conveying belt, and to continuously heat it at a high temperature of 80-180 DEG C for 15-30 minutes to make the paint film reach the ideal hardness and gloss.

[0003] However, the traditional drying process has significant defects. Since the bumper has just been painted, a large amount of uncured wet paint layer is attached to the surface. At the initial stage of high-temperature baking, the solvents (such as dimethylbenzene and butyl acetate) in the paint film volatilize rapidly, and the moisture (from the paint thinner or the environmental humidity) evaporates under heat, and the two mix to form a large amount of high-temperature and high-humidity water vapor. If these water vapor cannot be discharged in time, it will accumulate in the drying chamber and attach to the surface of the bumper, causing multiple problems: on the one hand, the water vapor in the local area will delay the drying speed of the paint film, causing the phenomenon of "surface drying and inner not drying", making the internal stress of the paint film uneven, and causing cracking and peeling in the later period; on the other hand, the water vapor condenses into water droplets on the low-temperature wall surface (such as the top of the drying chamber or the door body), and drops on the paint film which has not completely solidified, which will form defects such as "water spots" and "flowing", seriously affecting the appearance consistency; in addition, the high-humidity environment will also reduce the convection efficiency of the hot air in the drying chamber, causing uneven heat distribution, and the drying time in some areas needs to be extended to reach the standard, which not only increases the energy consumption, but also may cause the paint film to yellow or age due to over-baking.

[0004] Although the existing drying equipment is equipped with a ventilation system, it is difficult to adapt to the dynamic process of water vapor release and the change of the loading capacity of different batches of bumpers due to the fixed air duct design. When the loading capacity is large, insufficient ventilation will cause the water vapor to accumulate further; when the loading capacity is small, excessive ventilation will cause waste of heat. At the same time, the traditional drying chamber usually uses single-temperature-zone control, which cannot dynamically adjust the temperature and air speed according to the drying stage of the paint film, further limiting the improvement of the drying efficiency. These problems have become the key bottleneck restricting the stability of the paint spraying quality and the production efficiency of the bumper, and a new drying technology scheme that can efficiently remove moisture and accurately control the temperature is urgently needed. SUMMARY

[0005] The present application aims to provide a paint drying equipment to solve the problems in the background.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a paint surface drying equipment, comprising an equipment support and a product conveying belt, the product conveying belt passes through the equipment support, a positioning cover structure is arranged in the sealing cover part of the equipment support, a drying spray pipe structure is arranged below the positioning cover structure, the drying spray pipe structure comprises a plurality of groups of pipeline structures arranged independently of each other, and the pipeline structure has both air supply and air exhaust functions. The pipeline structure comprises a plurality of groups of air pipes arranged independently of each other, and the air pipes are provided with heat preservation layers on the side walls. The four corners of the air pipe are provided with branch pipelines, and the branch pipelines are arranged independently of each other.

[0007] Preferably, the equipment support further comprises a lower support part and guide supports located on both sides of the product conveying belt, and the guide supports are located between the lower support part and the sealing cover part.

[0008] Preferably, the positioning cover structure comprises a unit lifting frame and a unit mounting frame, the unit lifting frame is arranged in the sealing cover part of the equipment support through the lateral beams on both sides, the upper surface geometric center position of the unit lifting frame is provided with a pipeline positioning pipe, the two sides of the unit lifting frame are provided with fixed frames, and the two sides of the unit mounting frame are connected in the fixed frames.

[0009] Preferably, the branch pipeline has the functions of independent air supply and air exhaust.

[0010] The bottom outlet of the air pipe is provided with a horn-shaped air outlet, and the bottom outlet of the air pipe is provided with a retaining edge for limiting the ejection direction of the air flow.

[0011] The lower surface of the unit mounting frame is a circular arch dome, the circular arch dome is provided with a heating lamp tube, and the heating lamp tube can set the temperature as required.

[0012] The pipeline structure is provided with the circulation drying mode of air supply-air exhaust-air supply-air exhaust in sequence along the direction from the front end inlet to the rear end outlet.

[0013] The present application has the following advantages: The present equipment solves the core problems such as water vapor accumulation, uneven temperature, high energy consumption and quality fluctuation in the traditional drying process by the innovative segmented dynamic dehumidification and precise temperature control technology system, and brings comprehensive benefits in all aspects.

[0014] In terms of dehumidification, the dynamic air flow mode of air supply and air exhaust alternately circulating is adopted, and the bidirectional air flow switching function of the independent branch pipeline is matched, so that the solvent vapor and moisture volatilized from the paint film can be timely removed in the initial drying stage, the water vapor is prevented from accumulating and condensing in the room, the defects such as water spots, sagging and uneven drying of the paint film are completely eliminated, and the paint film curing is more pure and uniform.

[0015] In terms of temperature control, the heat loss is reduced through the heat preservation air pipe, the heat radiation is adjusted by the arc dome heating lamp tube partition, and the intelligent linkage control is combined to realize the precise adaptation of the paint film surface temperature, avoid the cracking caused by sudden heating, prevent the yellowing aging caused by over-baking, and ensure the synchronous improvement of the paint film hardness and weather resistance.

[0016] In terms of energy consumption and production efficiency, the segmented air flow logic of on-demand start and stop optimizes the energy utilization efficiency, cooperates with smooth conveying and automatic process, significantly improves the continuous production capacity, and reduces the invalid energy consumption. In terms of adaptability, it is compatible with various process requirements such as water-based paint and high-solid content paint, and can deal with abnormal conditions such as over-temperature and belt breakage through intelligent protection mechanism, to ensure the production stability, and the maintenance period is reasonable and convenient.

[0017] Finally, the equipment improves the consistency of paint surface drying quality while realizing the effective control of energy consumption cost and the efficient cooperation of production rhythm, provides a more reliable and more economical solution for automobile bumper and large workpiece paint baking, and helps enterprises realize the dual upgrade of quality and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the present application; Figure 3 is a positioning cover structure and a drying spray pipe structure schematic diagram of the present application; Figure 4 is a drying spray pipe structure schematic diagram.

[0019] In the drawings, the following marks are marked: 1-equipment support; 11-lower support part; 12-guiding support; 2-product conveying belt; 3-positioning cover structure; 31-unit lifting frame; 32-unit mounting frame; 33-pipe positioning pipe; 34-fixing frame; 4-drying spray pipe structure; 41-pipe structure; 411-air pipe; 412-heat preservation layer; 413-branch pipe; 414-baffle. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application will be further described below with reference to the drawings and the embodiments, to help the skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present application.

[0021] As shown in Figures 1-4 The present application provides a paint surface drying equipment, comprising an equipment support 1 and a product conveying belt 2, the product conveying belt 2 passes through the equipment support 1, the sealing cover part of the equipment support 1 is provided with a positioning cover structure 3, a drying nozzle structure 4 is installed below the positioning cover structure 3, the drying nozzle structure 4 comprises a plurality of groups of pipeline structures 41 which are independently arranged, and the pipeline structure 41 has both air exhaust and air supply functions. The conveying belt 2 is made of Teflon mesh belt with a mesh density of 10 meshes / cm2, which can ensure the passage of paint mist particles and prevent the workpiece from falling off; the driving system adopts a servo motor and a planetary reducer, and the conveying speed is linked with the drying cycle. Photoelectric sensors are arranged on both sides of the mesh belt to monitor the position of the workpiece in real time and trigger the start of the drying program.

[0022] The pipeline structure 41 comprises a plurality of groups of air pipes 411 which are independently arranged, and the air pipe 411 is provided with a heat preservation layer 412 on the side wall. The air pipe 411 is provided with branch pipes 413 at four corners, and the branch pipes 413 are independently arranged.

[0023] The branch pipes 413 are independently arranged at four corners of the main air pipe, and each group of branch pipes is provided with a bidirectional electromagnetic valve: in the air supply mode, the bidirectional electromagnetic valve is connected with a hot air generator, and in the air exhaust mode, the bidirectional electromagnetic valve is connected with a centrifugal fan. The end of the branch pipe is provided with an air flow diffuser to make the air flow uniformly cover the surface of the workpiece.

[0024] The equipment adopts a modular frame design, and the core comprises an equipment support 1 and a product conveying belt 2 to form a basic running platform.

[0025] The equipment support 1 serves as a main support structure and is divided into a lower support part 11 and a guide support 12: the lower support part 11 is fixed to the ground, bears the weight of the equipment and provides a horizontal reference; the guide supports 12 are symmetrically distributed on both sides of the conveying belt 2, and are adapted to the height of the bumper of different sizes through a vertical adjusting mechanism to ensure that the bumper smoothly enters the drying area. The product conveying belt 2 penetrates the sealing cover part of the equipment support 1 and is made of high-temperature-resistant silicone material, which can continuously convey the painted bumper, and the conveying speed is linked with the drying cycle for linkage control to realize automatic flow operation.

[0026] In the present embodiment, the equipment support 1 further comprises a lower support part 11 and guide supports 12 located on both sides of the product conveying belt 2, and the guide supports 12 are located between the lower support part 11 and the sealing cover part.

[0027] In this embodiment, the positioning cover structure 3 includes a unit hoisting frame 31 and a unit mounting frame 32. The unit hoisting frame 31 is installed inside the sealing cover part of the equipment support 1 through cross beams on both sides. At the geometric center position of the upper surface of the unit hoisting frame 31, there is a pipeline positioning pipe 33. On both sides of the unit hoisting frame 31, there are fixed frames 34, and both sides of the unit mounting frame 32 are connected inside the fixed frames 34.

[0028] In this embodiment, the sealing cover part of the equipment support 1 is a rectangular cavity, with the positioning cover structure 3 built-in. Its core function is to isolate the drying area from the external environment and at the same time improve the drying accuracy through physical positioning. The positioning cover structure 3 consists of a unit hoisting frame 31 and a unit mounting frame 32: The unit hoisting frame 31 is welded into a rectangular frame using Q235A square steel pipes and is suspended from the top cross beam of the sealing cover through M16 high-strength bolts, ensuring a load-bearing capacity of ≥500 kg; a pipeline positioning pipe 33 is provided at the geometric center of the frame, which is used to fix the main air inlet pipe and the exhaust pipe of the drying nozzle structure 4, and a pneumatic butterfly valve is equipped at the pipe opening to achieve rapid air flow switching.

[0029] The unit mounting frame 32 is spliced into a "冂"-shaped frame from aluminum alloy profiles. Both sides are embedded in the fixed frames 34 of the hoisting frame and can slide horizontally along the hoisting frame to adapt to bumpers of different widths; the lower surface of the mounting frame is an arc dome, and 6 groups of infrared heating lamps are evenly distributed inside the dome. The lamp spacing is 150 mm, and the coverage area is 1200 mm × 800 mm, ensuring the uniformity of the workpiece surface temperature.

[0030] In this embodiment, the unit hoisting frame 31 is suspended at the top of the sealing cover through cross beams on both sides, and a pipeline positioning pipe 33 is provided at the geometric center, which is used to fix the main air supply / exhaust pipeline of the drying nozzle structure 4 to ensure the stability of the air flow path; In this embodiment, the unit mounting frame 32 is embedded in the fixed frames 34 on both sides of the hoisting frame, and the lower surface is designed as an arc dome. Adjustable temperature heating lamps are integrated inside the dome, and a gradient temperature of 80 - 180 °C can be set according to the paint type to achieve differential heating in the surface drying and through drying stages of the paint film. The arc dome structure can also reflect thermal radiation, reduce the loss of heat to the sealing cover wall surface, and improve the energy utilization rate.

[0031] In this embodiment, the branch pipeline 413 has the functions of independent air supply and exhaust. At the bottom outlet of the air pipe 411, there is a flared air outlet. At the bottom outlet of the air pipe 411, there is a baffle 414, and the baffle 414 is used to limit the direction of the air flow ejection.

[0032] The main air pipe 411 is made of stainless steel seamless steel pipe, the inner wall is polished, the side wall is wrapped with a heat preservation layer 412, and the temperature attenuation of the hot air in the pipe is less than 5 ℃ / m; the bottom outlet of the air pipe is provided with a horn-shaped air outlet and a rotatable baffle 414, the baffle is controlled by a micro stepping motor, and the airflow direction can be dynamically adjusted according to the bumper curved surface to avoid dead angle accumulation of moisture.

[0033] In the embodiment, the drying nozzle structure 4 is the core structure of the device, which is installed below the positioning cover structure 3 and realizes the circulation of the air flow of “air supply-exhaust air” alternately through a plurality of pipeline structures 41. Each pipeline structure 41 includes the following key points: In the embodiment, a plurality of air pipes 411 are arranged side by side in the pipeline structure 41, and the side wall of each air pipe is wrapped with a heat preservation layer 412 to prevent the heat dissipation of the high-temperature gas in the pipe and maintain the stability of the air supply temperature.

[0034] In the embodiment, the air pipe 411 extends branch pipes 413 at four corners, and each branch pipe independently controls the air supply / exhaust function, for example, the front branch pipe blows hot air at 80-100 ℃, the middle branch pipe starts negative pressure suction, and the rear branch pipe blows hot air at 120-150 ℃ again, forming an air flow design of preheating-drying-wet strengthening.

[0035] In the embodiment, the bottom outlet of the air pipe 411 is provided with a horn-shaped air outlet and a baffle 414, the baffle can be deflected by 0-30°, and the airflow is guided to flow along the bumper curved surface to avoid local overheating of the paint film caused by direct blowing; the horn-shaped outlet expands the airflow coverage range to ensure that the complex shaped parts are uniformly heated.

[0036] In the embodiment, the lower surface of the unit mounting frame 32 is a circular arc dome, and the circular arc dome is provided with a heating lamp tube.

[0037] In the embodiment, the pipeline structure 41 is sequentially provided with the circulation drying mode of air supply-exhaust air-air supply-exhaust air from the front end inlet to the rear end outlet.

[0038] Working principle: when the device is running, the bumper enters the sealed cover with the conveying belt 2, the circular arc dome heating lamp tube of the positioning cover structure 3 starts to preheat at a low temperature of about 60-80 ℃, and the surface layer of the paint film is preliminarily softened. Then, the drying nozzle structure 4 works in the “air supply-exhaust air-air supply-exhaust air” circulation mode: First stage: the front air pipe 411 blows hot air through the branch pipe 413 to accelerate the volatilization of low-boiling-point solvents such as acetone in the paint film; Second stage: the middle air pipe is switched to negative pressure suction, and the volatilized solvent vapor and water vapor are discharged from the sealed cover through the independent exhaust branch pipe 413 to avoid accumulation; Third stage: the rear air pipe blows hot air at a higher temperature to promote the curing of high-boiling-point components; Fourth stage: the end of the tracheal suction again the remaining moisture, to ensure that the paint film is completely dry.

[0039] This cycle mode by real-time monitoring of the humidity sensor data in the sealed cover dynamic adjustment, when the humidity > 40% RH automatically extend the exhaust time, humidity < 20% RH shorten the time of air supply.

[0040] In summary, the equipment by sectional air control, independent heat preservation air pipe and the design of the circular arch dome heating, dynamic suction to make the drying chamber humidity is always controlled in 20-40% RH, to avoid the paint film "white" "blistering"; heating lamp and heat preservation air pipe, the realization of ± 5 ℃ temperature accuracy, prevent over-baking yellow; on-demand start-stop sectional air mode than traditional constant temperature drying more energy saving, at the same time compatible with different paint process, strong adaptability.

[0041] The above description of the present application is combined with the drawings, it is obvious that the specific implementation of the present application is not limited to the above manner, as long as the various non-essential improvements are made by using the inventive concept and technical solutions of the present application, or the inventive concept and technical solutions of the present application are directly applied to other occasions without improvement, all within the scope of the present application.

Claims

1. A paint-drying apparatus, characterized by: Including equipment support (1) and product conveying belt (2), product conveying belt (2) passes through equipment support (1), the sealing cover part of equipment support (1) is equipped with positioning cover structure (3), the lower portion of positioning cover structure (3) is equipped with drying spray pipe structure (4), drying spray pipe structure (4) includes multiple groups of pipeline structures (41) independently arranged, pipeline structure (41) has two functions of exhaust and air supply; The pipeline structure (41) includes multiple groups of air pipes (411) independently arranged, and the sidewall of the air pipe (411) is provided with a heat preservation layer (412); The four corners of the air pipe (411) are provided with branch pipes (413), and the branch pipes (413) are independently arranged.

2. A paint drying apparatus as claimed in claim 1, characterised in that: The equipment support (1) further includes a lower support portion (11) and a guide support (12) located on both sides of the product conveying belt (2), and the guide support (12) is located between the lower support portion (11) and the sealing cover portion.

3. A paint drying apparatus as claimed in claim 1, wherein: The positioning cover structure (3) includes a unit lifting frame (31) and a unit mounting frame (32), the unit lifting frame (31) is mounted in the sealing cover portion of the equipment support (1) through the lateral beams on both sides, the upper surface geometric center position of the unit lifting frame (31) is provided with a pipeline positioning pipe (33), the both sides of the unit lifting frame (31) are provided with a fixed frame (34), and the both sides of the unit mounting frame (32) are connected in the fixed frame (34).

4. A paint drying apparatus as claimed in claim 1, wherein: The branch pipe (413) has the functions of independent air supply and exhaust.

5. A paint drying apparatus as claimed in claim 1, wherein: The bottom outlet of the air pipe (411) is provided with a horn-shaped air outlet.

6. A paint drying apparatus as claimed in claim 1, wherein: The bottom outlet of the air pipe (411) is provided with a retaining edge (414), and the retaining edge (414) is used for limiting the ejection direction of air flow.

7. A paint drying apparatus as claimed in claim 3, wherein: The lower surface of the unit mounting frame (32) is a circular arch dome, the circular arch dome is provided with a heating lamp, and the heating lamp can set the temperature as required.

8. A paint drying apparatus as claimed in claim 1, wherein: The pipeline structure (41) is sequentially provided with air supply-exhaust-air supply-exhaust circulating drying pipes from the front end inlet to the rear end outlet.

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