Water-based paint dipping process for construction machinery tracks

Abstract

The application discloses a water-based paint dipping process for engineering machinery tracks, which comprises the following steps: a bundling step, in which adjacent track plates of a track are rolled to stack the track plates to form a track plate bundle; a feeding step; a cleaning and degreasing step, in which the track plate bundle is degreased by using a 40-50 DEG C cleaning agent for 2-3 min, then washed by using 40-50 DEG C pure water for 2-3 min, and then blown by using 50-60 DEG C air flow for 5 min to dry the moisture on the track plates; a paint dipping step, in which the track plate bundle is placed in a paint tank for dipping in an environment with an air relative humidity of less than or equal to 80 %; a paint draining step, in which the track plate bundle after the dipping is taken out of the paint tank and drained in an environment with an air relative humidity of less than or equal to 80 %; a leveling step, in which air flow is blown to the surface of the track plate bundle to level the track plate bundle in an environment with an air relative humidity of less than or equal to 80 %; a drying step; and a strong cooling step, in which the surface temperature of the track plates of the track plate bundle is reduced to below 40 DEG C.

Description

Technical Field

[0001] This invention relates to a water-based paint dip coating process, and particularly to a water-based paint dip coating process for engineering machinery tracks. Background Technology

[0002] Track shoes are chassis components of construction machinery and are considered wear parts. They are commonly used on excavators, bulldozers, tracked cranes, and pavers. Steel track shoes are mostly used on equipment with higher tonnage. In recent years, with the rapid development of industry, the construction machinery manufacturing industry has risen and grown rapidly, driving the development of the track shoe industry and its related coating industry. Track shoes are wear parts, mainly due to their intended use. Therefore, to ensure a longer service life, their surface coating must have high hardness, high adhesion, and strong impact resistance. Traditional coating processes often use spraying, but due to the complex shape and structure of track assemblies, spray degreasing and spraying processes cannot meet the requirements for track coating. Therefore, dip coating is often used. Currently, most track coating processes in the industry involve heating and cleaning on the pre-bundling line, with a process flow of assembly, cleaning and degreasing, bundling, loading, preheating, and dipping. However, this process is prone to energy waste and generates secondary pollution during transportation, resulting in high production costs and affecting the quality of track coating. Summary of the Invention

[0003] The purpose of this invention is to provide a water-based paint dipping process for engineering machinery tracks that saves energy, reduces secondary pollution, and improves the appearance coating quality of tracks.

[0004] This invention discloses a water-based paint dipping process for engineering machinery tracks, comprising:

[0005] The bundling step includes rolling up adjacent track plates of the track so that the track plates of the track are stacked to form a track plate bundle;

[0006] The loading step includes using a lifting device to lift the track plate bundle;

[0007] The cleaning and degreasing steps include degreasing the track pad bundles with a cleaning agent at 40-50°C for 2-3 minutes, then washing the track pad bundles with pure water at 40-50°C for 2-3 minutes, and then blowing water onto the track pad bundles with an airflow at 50-60°C for 5 minutes to dry the moisture on the track pads.

[0008] The dipping process includes placing the track plate bundles in a paint tank for dipping in an environment with relative humidity ≤80%, wherein the temperature of the water-based paint in the paint tank is 15-35℃, and the dipping time of the track plate bundles in the water-based paint is 20s.

[0009] The paint application step includes removing the track pads that have been dipped in paint from the paint tank and applying paint in an environment with a relative humidity of ≤80%.

[0010] The leveling step includes using airflow to blow onto the surface of the track pad bundle in an environment with relative humidity ≤80% to level the track pad bundle;

[0011] The drying step includes drying the leveled track pad bundles;

[0012] The forced cooling process includes rapidly cooling the track pad bundles to reduce the surface temperature of the track pads to below 40°C.

[0013] In some embodiments, a protective step is included before the bundling step, which includes applying grease to the pin holes and / or sleeve holes of each track plate and inserting protective plugs.

[0014] In some embodiments, lifting the track plate bundle using a lifting device includes lifting the track plate bundle at an angle of 15 to 30°, and maintaining this lifting angle of the track plate bundle unchanged until the strong cooling step is completed.

[0015] In some embodiments, the paint application step includes applying paint for 180 seconds in an environment with a relative humidity of ≤80%.

[0016] In some embodiments, the airflow used to level the track pad bundles in the leveling step has a wind speed of 0.4 to 1 m / s and a leveling time of 3 to 5 min.

[0017] In some embodiments, the drying step includes drying the track pad bundle at 60–80°C for 35–50 minutes.

[0018] In some embodiments, the track pad bundles are dried using a gas-fired far-infrared drying device.

[0019] In some embodiments, the forced cooling step includes rapidly cooling the track pad bundles for 10 to 15 minutes.

[0020] In some embodiments, a degreasing and rust-preventing two-in-one cleaning agent is used in the cleaning and degreasing step, with a concentration of 8-10%, and a cleaning method combining spraying and immersion is adopted.

[0021] In some embodiments, after blowing water on the track plate bundle for 5 minutes, the surface temperature of the track plate of the track plate bundle is 15-35°C.

[0022] In some embodiments, the impregnation step uses a base-and-surface integrated water-based impregnation coating, employing a one-time impregnation process, to achieve a surface coating thickness of 40–80 μm for the track plates of the track plate bundle.

[0023] Based on the water-based paint dipping process for engineering machinery tracks provided by this invention, by placing the cleaning and degreasing steps after the bundling and loading steps and before the dipping step, the track pad bundles can be effectively cleaned without preheating before the dipping step, reducing the preheating process and saving energy. Furthermore, after cleaning and degreasing the track pad bundles, there is no need for loading and transfer; dipping can proceed directly, reducing secondary pollution during transportation. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0026] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The water-based paint dipping process for engineering machinery tracks in this embodiment includes the following steps: bundling, loading, cleaning and degreasing, dipping, asphalt application, leveling, drying, and forced cooling. For example, the water-based paint dipping process can be applied to engineering machinery tracks with a 216mm pitch, 49 track plates, and a track plate width of 800mm.

[0029] The bundling process involves rolling up adjacent track plates to stack them into a track plate bundle. A track is composed of many track plates connected together, with adjacent plates hinged at the edges and able to rotate relative to each other. To make the track more compact and easier to handle during the coating process, the track plates are rolled up using the hinged relationship between them, stacking them as high as possible to form a track plate bundle. The shape of the track plate bundle can then be fixed using ropes or other methods.

[0030] The loading process includes using lifting equipment to hoist the track pad bundles. After the track pad bundles are formed, they are then hoisted using the hooks of lifting equipment such as electric hoists.

[0031] The cleaning and degreasing steps include degreasing the track pad bundles with a 40-50°C cleaning agent for 2-3 minutes, then rinsing them with 40-50°C pure water for 2-3 minutes, followed by drying them with a 50-60°C hot air stream for 5 minutes. Pure water refers to water with low conductivity; distilled water can be used, but it is not required to be distilled water-grade pure water. Only water with low conductivity, such as below 100 μS / cm, is needed. After the cleaning and degreasing steps, the surface temperature of the track pads on the track pad bundles is 15-35°C.

[0032] The dipping process includes placing the track pad bundles in a paint tank for dipping in an environment with relative humidity ≤80%, wherein the temperature of the water-based paint in the paint tank is 15-35℃, and the dipping time of the track pad bundles in the water-based paint is 20s.

[0033] The paint application process includes removing the track pad bundles that have been dipped in paint from the paint tank, applying paint in an environment with a relative humidity of ≤80%, maintaining the lifting angle of the track pad bundles under the action of the lifting equipment, and allowing excess water-based paint to drip off from the surface of the track pads.

[0034] The leveling step involves using airflow to blow onto the surface of the track pad bundle in an environment with relative humidity ≤80% to level the track pad bundle, thereby causing the solvent vapors on the track pad surface to evaporate within a certain time. At the same time as the vapors evaporate, the wet paint film on the track pad surface is also leveled, thus ensuring the smoothness and gloss of the paint film.

[0035] The drying step includes drying the leveled track pad bundles to remove moisture from the paint film on the track pad surface.

[0036] The forced cooling step involves rapidly cooling the track pad bundle to reduce the surface temperature of the track pads to below 40°C. This forced cooling process quickly cools and solidifies the paint film on the track pad surface, thus completing the impregnation process. After the forced cooling step is completed, the track pad bundle is removed from the lifting device, completing the unloading step.

[0037] Construction machinery tracks require preheating before the dipping process. Without preheating, the low surface temperature leads to poor dipping and an unsatisfactory paint film. This embodiment utilizes a water-based paint dipping process for construction machinery tracks. By placing the cleaning and degreasing steps after the bundling and loading steps and before the dipping step, the track bundles are effectively cleaned without the need for preheating, reducing the preheating process and saving energy. Furthermore, after cleaning and degreasing the track bundles, there is no need for loading and transfer; dipping can proceed directly, reducing secondary contamination during transport.

[0038] In some embodiments, a protective step is included before the bundling step. This protective step involves applying grease to the pin holes and / or sleeve holes of each track plate and inserting protective plugs. The track plates have pin holes for mounting pins and sleeve holes for mounting pin sleeves that mate with the pins. These holes do not require painting; therefore, in this embodiment, applying grease and inserting protective plugs to the pin holes and sleeve holes prevents interference with them throughout the water-based paint dipping process, thus protecting them.

[0039] In some embodiments, lifting the track pad bundles using a lifting device involves lifting the track pad bundles at an angle of 15–30°, and maintaining this lifting angle until the intensive cooling step is completed. The lifting angle of the track pad bundles refers to the angle between the axis of the track pad bundles and the vertical direction after the lifting device has lifted them. Maintaining this lifting angle until the intensive cooling step is completed helps to improve the effectiveness of the washing, impregnation, asphalt coating, and leveling processes.

[0040] In some embodiments, the paint application step includes applying paint for 180 seconds in an environment with a relative humidity of ≤80%. This paint application time can achieve a good paint application effect, while also helping to avoid unevenness of the paint film under gravity caused by excessive time.

[0041] In some embodiments, the airflow velocity used to blow onto the surface of the track pad bundle to level the track pad bundle in the leveling step is 0.4 to 1 m / s, and the leveling time is 3 to 5 min.

[0042] In some embodiments, the drying step includes drying the track pad bundles at 60–80°C for 35–50 minutes.

[0043] In some embodiments, a gas-fired far-infrared drying device is used to dry the track pad bundles. This embodiment employs a gas-fired far-infrared drying device, which improves the drying effect and reduces energy consumption.

[0044] In some embodiments, the rapid cooling step includes rapidly cooling the track pad bundles for 10 to 15 minutes. Rapid cooling can be performed by blowing cold air.

[0045] In some embodiments, a degreasing and rust-preventing two-in-one cleaning agent is used in the cleaning and degreasing step, with a concentration of 8-10%, employing a combination of spraying and immersion cleaning methods. For example, Lockeway RA-7100 cleaning agent from Hangzhou Locke Technology Co., Ltd. can be used, with a water-to-clean ratio of 8-10%. The spraying-immersion cleaning method refers to first soaking the track pads in the cleaning agent mixed with water, followed by spraying, which allows for more efficient and thorough cleaning of the track pads.

[0046] In some embodiments, after blowing water onto the track plate bundles for 5 minutes, the surface temperature of the track plates in the track plate bundles is 15–35°C.

[0047] In some embodiments, a combined topcoat and basecoat water-based dip coating is used in the dipping process, meaning the dip coating can function as both a topcoat and a primer. A single dip coating process is employed to achieve a paint film thickness of 40–80 μm on the surface of the track plates of the track plate bundle. This embodiment successfully obtains low-cost, high-quality engineering track products with a paint film thickness of 40–80 μm and adhesion ≤ Grade 1. The water-based dip coating can be the product name "Water-based Dipping Coating BT-6016 Black" from Haolisen Chemical (Shanghai) Co., Ltd.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A waterborne paint dip coating process for an engineering machine track, characterized by, The method comprises the following steps: a bundling step, which comprises rolling adjacent track shoes of a track to stack the track shoes of the track to form a track shoe bundle; a lifting step, which comprises lifting the track shoe bundle by using a lifting tool; a degreasing and cleaning step, which comprises degreasing and cleaning the track shoe bundle by using a 40-50 DEG C cleaning agent for 2-3 minutes, then washing the track shoe bundle by using 40-50 DEG C pure water for 2-3 minutes, and then blowing water on the track shoe bundle by using a 50-60 DEG C air flow for 5 minutes to dry the water on the track shoe; a paint dipping step, which comprises placing the track shoe bundle in a paint tank to dip paint in an environment with an air relative humidity of less than or equal to 80%, wherein the water-based paint in the paint tank has a temperature of 15-35 DEG C, and the track shoe bundle is placed in the water-based paint for 20 seconds; a paint draining step, which comprises taking out the track shoe bundle after the paint dipping step from the paint tank to drain paint in an environment with an air relative humidity of less than or equal to 80%; a leveling step, which comprises blowing air to the surface of the track shoe bundle by using an air flow to level the track shoe bundle in an environment with an air relative humidity of less than or equal to 80%; a drying step, which comprises drying the track shoe bundle after the leveling step; a rapid cooling step, which comprises rapidly cooling the track shoe bundle to reduce the surface temperature of the track shoe bundle to less than or equal to 40 DEG C.

2. The waterborne paint dip process for an engineered machine track as claimed in claim 1, wherein, The method further comprises a protection step before the bundling step, wherein the protection step comprises applying butter to the pin hole and / or sleeve hole of each track shoe and inserting a protection plug into the pin hole and / or sleeve hole.

3. The waterborne paint dip process for an engineered machine track as claimed in claim 1, wherein, The lifting step comprises lifting the track shoe bundle by using the lifting tool at an angle of 15-30 DEG C, and the lifting angle of the track shoe bundle is kept unchanged before the rapid cooling step is completed.

4. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The paint draining step comprises draining paint in an environment with an air relative humidity of less than or equal to 80% for 180 seconds.

5. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The air flow used in the leveling step to blow air to the surface of the track shoe bundle to level the track shoe bundle has a wind speed of 0.4-1 m / s, and the leveling time is 3-5 minutes.

6. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The drying step comprises drying the track shoe bundle in an environment with a temperature of 60-80 DEG C for 35-50 minutes.

7. The waterborne paint dip process for an engineered machine track as claimed in claim 6 wherein, The drying step comprises drying the track shoe bundle by using a gas far infrared drying device.

8. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The rapid cooling step comprises rapidly cooling the track shoe bundle for 10-15 minutes.

9. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The degreasing and cleaning step adopts a degreasing and rust-preventing two-in-one cleaning agent, and the concentration of the cleaning agent is 8-10%.

10. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, After the track shoe bundle is blown water for 5 minutes, the surface temperature of the track shoe bundle is 15-35 DEG C.

11. The waterborne paint dip process for an engineered machine track as claimed in claim 1 wherein, The paint dipping step adopts a water-based dipping paint with a bottom surface, and adopts a one-time dipping process to make the surface paint film thickness of the track shoe bundle be 40-80 microns.