Hot melt marking paint laboratory test device

Abstract

The utility model belongs to the road marking paint performance detection field relates to a kind of hot melt marking paint laboratory testing device, including feed assembly, forming assembly, support assembly and temperature control assembly;Forming assembly is overall shallow pool structure;Forming assembly is erected on support assembly;Feed assembly is vertically arranged on support assembly and supplies experimental paint to forming assembly;Temperature control assembly is respectively arranged on feed assembly, forming assembly and support assembly.The utility model provides a kind of hot melt marking paint laboratory testing device, temperature and thickness control are accurate and can completely simulate actual construction working condition.

Description

Technical Field

[0001] This utility model belongs to the field of performance testing of road marking paint, and relates to an experimental testing device, especially a laboratory testing device for hot melt marking paint that can accurately control the heating temperature and coating thickness. Background Technology

[0002] Hot-melt road marking paint is a type of paint that is melted by heating and applied to the road surface. It is commonly used for highway markings to provide clear traffic guidance. The added glass microspheres impart retroreflective properties to the markings, reflecting light back towards the driver under vehicle headlights at night, improving the visibility of the markings. However, under existing laboratory conditions, the imprecise control of heating temperature and coating thickness in performance testing of hot-melt road marking paint significantly affects the correlation between experimental results and actual service performance, making it particularly difficult to accurately assess key indicators such as retroreflective performance. Retroreflective performance is highly dependent on the embedding state of the glass microspheres in the coating, which is directly affected by the paint temperature and its cooling process.

[0003] Existing laboratory testing methods typically employ simple heating, manual application, and natural cooling, which cannot simulate the bottom-up cooling process of the coating in actual road conditions and the combined effects of convection heat transfer with air. This results in significant differences between the glass bead embedding behavior and coating performance and actual conditions. Furthermore, inconsistent coating thickness further leads to uneven cooling rates, affecting the mechanical and optical properties of the coating, making laboratory conclusions difficult to effectively guide engineering applications. Clearly, existing testing equipment cannot simultaneously and precisely control the heating temperature, film thickness, and cooling conditions of hot-melt road marking paint. This prevents laboratory tests from effectively guiding the optimization of actual products. This structural issue urgently needs to be addressed in the research and quality control of hot-melt road markings; otherwise, it will reduce the service quality of hot-melt road markings and affect traffic safety. Utility Model Content

[0004] In order to solve the above-mentioned technical problems in the background art, the present invention provides a laboratory testing device for hot melt road marking paint that can accurately control temperature and thickness and completely simulate actual construction conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A laboratory testing device for hot-melt road marking paint, characterized in that: the laboratory testing device for hot-melt road marking paint includes a feeding component, a forming component, a supporting component, and a temperature control component; the forming component is generally in the shape of a shallow pool; the forming component is mounted on the supporting component; the feeding component is vertically mounted on the supporting component and supplies the test paint into the forming component; the temperature control component is respectively mounted on the feeding component, the forming component, and the supporting component.

[0006] Preferably, the temperature control component includes an adjustable speed fan, an infrared thermometer, a heating temperature sensor, a discharge temperature sensor, a surface temperature sensor, and a water storage tank; the adjustable speed fan and the infrared thermometer are mounted on the support component; the heating temperature sensor and the discharge temperature sensor are mounted on the feeding component; and the surface temperature sensor and the water storage tank are mounted on the molding component.

[0007] Preferably, the feeding assembly includes a heating container, a control valve, and a discharge pipe; the heating container is connected to the discharge pipe through the control valve; the discharge port of the discharge pipe faces the molding assembly and supplies experimental coating to the shallow pool of the molding assembly; the heating container is vertically mounted on the support assembly; the heating temperature sensor is placed inside the heating container; and the discharge temperature sensor is placed at the discharge port of the discharge pipe.

[0008] Preferably, the feeding assembly further includes a stirring rod and a stirring motor; the stirring motor is fixedly mounted on the support assembly; the stirring rod is positioned inside the heating container along the axial direction of the heating container; the stirring motor is connected to the stirring rod and drives the stirring rod to rotate.

[0009] Preferably, the forming assembly includes a heater, a forming steel plate, and a sidewall disposed at the edge of the forming steel plate; the sidewall and the forming steel plate form a shallow pool-like structure; the forming steel plate is mounted on a support assembly; the heater and a water tank are disposed in parallel at the bottom of the forming steel plate; and the surface temperature sensor is disposed on the upper surface of the forming steel plate.

[0010] Preferably, the forming assembly further includes a leveling applicator; a groove is provided on the side wall along the length of the side wall; the lower edge of the groove is at a height higher than the upper surface of the forming steel plate; the leveling applicator is embedded in the groove and moves along the axial direction of the groove.

[0011] Preferably, the forming assembly further includes a partition disposed on the forming steel plate along the moving direction of the scraper applicator, the end of the partition being engaged or embedded in the side wall; the partition is one or more, and the partition is a non-perforated partition and / or a perforated partition; the heater is an electric heating plate or a heating tube.

[0012] Preferably, the support assembly includes a bearing platform, a boss, a horizontal slide rail, and a support frame; the formed steel plate is mounted on the bearing platform; the boss is located at the edge of the bearing platform; the axial direction of the boss is perpendicular to the moving direction of the scraper applicator; a horizontal slide rail is provided on the boss along its axial direction; the support frame is placed on the horizontal slide rail and slides freely on the horizontal slide rail; the feeding assembly is vertically mounted on the support frame; the adjustable speed fan and the infrared thermometer are arranged in parallel on the support frame.

[0013] Preferably, the support assembly further includes a support base disposed at the bottom of the support frame.

[0014] Preferably, both the heating temperature sensor and the discharge temperature sensor are high-temperature thermocouples or high-temperature platinum resistance thermometers; the water storage tank is equipped with heating elements and cooling elements.

[0015] Compared with the prior art, the advantages and beneficial effects of this utility model are: This invention provides a laboratory testing device for hot-melt road marking paint, including a feeding component, a forming component, a supporting component, and a temperature control component. The forming component has a shallow pool-like structure and is mounted on the supporting component. The feeding component is vertically positioned on the supporting component and supplies the experimental paint into the forming component. The temperature control component is located on the feeding component, the forming component, and the supporting component. This invention, through a specially designed laboratory device, achieves precise control over the entire process of hot-melt road marking paint, from heating and application to cooling. The device uses a sealed container with heating wires to achieve precise heating and heat preservation of the paint, and temperature sensors at the bottom and outlet monitor the paint status in real time. After the paint flows out, it is formed by a preheated adjustable-thickness steel plate and then coated by a coater to form a film of uniform thickness. The core innovation of the system lies in achieving bidirectional temperature monitoring of the coating surface and bottom: an infrared thermometer monitors the surface temperature, and a sensor built into the steel plate monitors the bottom temperature; simultaneously, an upper fan controls the airflow at room temperature to adjust the surface cooling rate, while a water-temperature-controlled iron box at the bottom simulates the road surface heat capacity effect, thus comprehensively replicating the temperature gradient and cooling process under actual road conditions. The equipment can precisely control the heating temperature, coating thickness and cooling environment of hot-melt road marking paint, significantly improving the correlation between laboratory tests and actual service performance, and providing a reliable and efficient experimental platform for optimizing the retroreflective performance and evaluating the durability of hot-melt road marking paint. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the laboratory testing device for hot-melt road marking paint provided by this utility model; Figure 2 This is a side view of the laboratory testing device for hot-melt road marking paint provided by this utility model. The annotations in the attached figures are explained as follows: 1-Feeding assembly; 11-Heating container; 12-Stirring rod; 13-Control valve; 14-Discharge pipe; 15-Stirring motor; 2-Forming assembly; 21-Forming steel plate; 22-Side wall; 23-Chutter; 24-Non-perforated partition; 25-Perforated partition; 26-Scraper applicator; 3-Support assembly; 31-Bearing platform; 32-Boss; 33-Horizontal slide rail; 34-Support frame; 35-Support base; 4-Temperature control assembly; 41-Adjustable speed fan; 42-Water tank; 43-Infrared thermometer. Detailed Implementation

[0017] See Figure 1 as well as Figure 2 This utility model provides a laboratory testing device for hot-melt road marking paint. The laboratory testing device for hot-melt road marking paint includes a feeding component 1, a forming component 2, a supporting component 3, and a temperature control component 4. The forming component 2 has a shallow pool-like structure. The forming component 2 is mounted on the supporting component 3. The feeding component 1 is vertically mounted on the supporting component 3 and supplies the test paint to the forming component 2. The temperature control component 4 is mounted on the feeding component 1, the forming component 2, and the supporting component 3.

[0018] The temperature control component 4 includes an adjustable-speed fan 41, an infrared thermometer 43, a heating temperature sensor, a discharge temperature sensor, a surface temperature sensor, and a water storage tank 42. The adjustable-speed fan 41 and the infrared thermometer 43 are mounted on the support component 3; the heating temperature sensor and the discharge temperature sensor are mounted on the feeding component 1; and the surface temperature sensor and the water storage tank 42 are mounted on the molding component 2. The heating temperature sensor, the discharge temperature sensor, and the surface temperature sensor are used to acquire key temperature parameters during the experiment. The heating temperature sensor and the discharge temperature sensor ensure accurate temperature control during coating discharge. During the coating cooling stage, the infrared thermometer 43 and the surface temperature sensor monitor the surface and bottom temperatures of the coating, respectively.

[0019] Both the heating temperature sensor and the discharge temperature sensor are high-temperature thermocouples or high-temperature platinum resistance thermometers; the water tank 42 is equipped with heating and cooling elements. The temperature control component 4 is used to control or adjust the temperature of the coating in the shallow pool according to the ambient temperature. The adjustable speed fan 41 is located above the coating, aligned with the coating area on the formed steel plate 21. The adjustable speed fan 41 can provide airflow at a constant temperature (generally room temperature). In the experiment, the adjustable speed fan 41 is started the instant the glass beads are scattered, and the airflow blows onto the coating surface at a set speed. By changing the rotation speed of the adjustable speed fan 41, different environmental wind speed conditions, such as light breeze or strong wind, can be simulated, which have different effects on the cooling rate of the coating.

[0020] The water tank 42 is installed flush against the bottom of the formed steel plate 21. The water tank 42 is made of a highly thermally conductive metal (such as iron or copper; for example, it could be a water-filled iron tank), and is hollow inside, filled with a certain amount of water through an inlet to act as a cooling medium. During the experiment, the formed steel plate 21 maintains good contact with the water tank 42 or is tightly fitted via thermally conductive pads to ensure that the heat generated by the coating can be conducted to the cooling medium in the water tank 42. A temperature control system is connected to the water tank 42, and heating and cooling elements are installed inside. The heating element, for example, is a tubular electric heater that heats the water in the tank to a set temperature; the cooling element can be a semiconductor cooler or a cooling coil (connected to an external refrigerator) to lower the water temperature inside the tank. Before the experiment begins, the water temperature in the water tank 42 can be adjusted as needed. For example, to simulate typical road surface temperatures, the water temperature can be pre-adjusted to around 25°C; to simulate high-temperature road surfaces, it can be increased to 50°C; to simulate cold conditions, it can be lowered to 5°C or even 0°C, close to freezing point. After the paint is poured and leveled, the water tank 42 quickly absorbs heat from the coating from below. If further acceleration of cooling is needed, the cooling element can be activated to maintain a low water temperature; conversely, the heating element can be used to appropriately heat the water to slow down the cooling rate. By combining air cooling from the outlet of the adjustable-speed fan 41 with bottom cooling from the water tank 42, the coating sample will cool and cure in a manner closely resembling the actual road surface environment. This dual cooling method effectively avoids deviations caused by air cooling alone or bottom cooling alone, making the glass bead embedding process and coating curing morphology more consistent with actual construction conditions.

[0021] See Figure 1The feeding assembly 1 used in this invention includes a heating container 11, a control valve 13, and a discharge pipe 14. The heating container 11 is connected to the discharge pipe 14 via the control valve 13. The discharge port of the discharge pipe 14 faces the molding assembly 2 and supplies experimental coating to the shallow pool of the molding assembly 2. The heating container 11 is vertically mounted on the support assembly 3. A heating temperature sensor is placed inside the heating container 11, and a discharge temperature sensor is placed at the discharge port of the discharge pipe 14. The heating container 11 is a cylindrical metal container with an open top. Electric heating wires are wound around its side walls and bottom for uniform heating and heat preservation of the internal coating. Insulation material is provided on the outermost layer to reduce heat loss during the heating and heat preservation process. The bottom of the heating container 11 has a discharge pipe 14, the end of which is the discharge port. Preferably, the control valve 13 is manually or electrically controlled. After the coating is heated, the valve can be opened to allow the molten coating to flow out from the discharge port. The diameter and shape of the discharge port are designed to appropriate specifications to ensure controllable paint flow and stable outflow pattern. A heating temperature sensor is installed at the bottom of the heating container 11, close to the bottom wall, to measure the real-time temperature of the paint; a discharge temperature sensor is also installed at the discharge port to measure the temperature of the paint the instant it flows out of the container. These two sensors can be high-temperature thermocouples or high-temperature platinum resistance thermometers, such as K-type thermocouple probes, with a temperature measurement range covering room temperature to 300℃ and an accuracy of ±1℃, to ensure accurate capture of changes in the temperature of the molten paint. Simultaneously, to ensure that the material inside the heating container 11 is uniformly heated, the feeding assembly 1 of this invention also includes a stirring rod 12 and a stirring motor 15; the stirring motor 15 is fixedly mounted on the support assembly 3; the stirring rod 12 is positioned inside the heating container 11 along its axial direction; the stirring motor 15 is connected to the stirring rod 12 and drives the stirring rod 12 to rotate. The stirring rod 12 is an inert metal rod, driven by the stirring motor 15 to ensure uniform heating and mixing of the paint inside the heating container 11.

[0022] See Figure 1The forming component 2 used in this invention includes a heater, a forming steel plate 21, and a sidewall 22 disposed at the edge of the forming steel plate 21. The sidewall 22 and the forming steel plate 21 form a shallow pool-like structure, which is used to limit the flow range of the coating and control the coating thickness. The height of the replaceable sidewall can be adjusted according to the required coating thickness, specifically by replacing sideplates of different heights or using a liftable structure. For example, the sidewall height can be adjusted to 1.5 mm to obtain a sample with a thickness equivalent to that of actual road markings; if it is necessary to test the effect of different thicknesses on performance, the sidewall height can also be adjusted accordingly. The forming steel plate 21 is mounted on the support component 3; the heater and the water tank 42 are arranged in parallel at the bottom of the forming steel plate 21; the surface temperature sensor is disposed on the upper surface of the forming steel plate 21. The forming component 2 is horizontally disposed below the discharge port to receive the flowing molten coating and form a sample of a specified thickness. The forming steel plate 21 is made of a thick thermally conductive metal material, such as steel or aluminum alloy plate, to simulate the rigid substrate characteristics of the road surface. The length and width of the formed steel plate 21 are designed to accommodate coating samples of a certain size. To preheat the steel plate to a specified temperature before pouring the coating, an independent heater is installed beneath the formed steel plate 21. The heater can be an electric heating plate or heating tube attached to the bottom surface of the formed steel plate 21. Before the experiment begins, the formed steel plate 21 is electrically heated to bring its surface temperature close to that of the environment or road surface. This preheating step prevents rapid solidification of the molten coating upon contact with a cold metal surface, thus helping to improve the adhesion and uniformity of the coating.

[0023] For example, the surface temperature sensor is embedded in the side of the formed steel plate 21 near the coating, actually measuring the temperature change at the bottom of the coating, immediately adjacent to the steel plate. A thin-film temperature sensor can be used, attached directly to the surface of the steel plate, or the sensing end of a thermocouple can be embedded in the shallow layer of the upper surface of the steel plate. The surface sensor can be a high-temperature resistant K-type thermocouple (temperature range up to 300℃) mounted on the surface of the formed steel plate 21, and calibration ensures the accuracy of the measured coating interface temperature. To improve the reliability of temperature measurement, all sensors are calibrated before use, and the temperature-time curves are recorded in real time by a computer during the experiment. After the coating cools to room temperature, this data can be used to determine the temperature range corresponding to the glass bead embedding, the coating cooling rate, and the temperature gradient, thus providing a basis for analyzing the performance of the marking line.

[0024] The forming component 2 also includes a scraper applicator 26; a groove 23 is provided on the sidewall 22 along its length; the lower edge of the groove 23 is at a height higher than the upper surface of the forming steel plate 21; the scraper applicator 26 is embedded in the groove 23 and moves axially along the groove 23. The scraper applicator 26 is located above the replaceable sidewall and is typically a scraper or applicator bar spanning two replaceable sidewalls. The gap between the lower edge of the scraper applicator 26 and the forming steel plate 21 below the replaceable sidewall is the target coating thickness. When molten paint is poured into the shallow groove formed by the replaceable sidewall and the forming steel plate 21, the scraper applicator 26 slides on the top of the sidewall to evenly scrape away excess paint, making the coating surface flush with the upper edge of the sidewall. This ensures a consistent coating thickness, a smooth surface, and no excess buildup. With the combination of the shaped steel plate 21, replaceable sidewalls, and scraper applicator 26, this device can prepare coating samples that meet the standard thickness requirements in the laboratory, ensuring that subsequent test results are comparable and repeatable.

[0025] The forming assembly 2 also includes a partition disposed on the forming steel plate 21 along the moving direction of the scraper applicator 26, the ends of which are held or embedded in the sidewall; there are one or more partitions, which are non-perforated partitions 24 and / or perforated partitions 25; the heater is an electric heating plate or a heating tube.

[0026] The support assembly 3 includes a support platform 31, a boss 32, a horizontal slide rail 33, and a support frame 34. The forming steel plate 21 is mounted on the support platform 31. The boss 32 is located at the edge of the support platform 31. The axial direction of the boss 32 is perpendicular to the moving direction of the scraper applicator 26. A horizontal slide rail 33 is provided along the axial direction of the boss 32. The support frame 34 is placed on the horizontal slide rail 33 and slides freely on it. The feeding assembly 1 is vertically mounted on the support frame 34, meaning the heating container 11 can be moved as a whole via the horizontal slide rail 33, ensuring that the molten coating can flow fully into different forming areas below. An adjustable speed fan 41 and an infrared thermometer 43 are arranged in parallel on the support frame 34. For example, the infrared thermometer 43 is fixedly installed at a certain distance above the coating, aligned with the center of the coating surface. Its selection meets the requirements of high measurement accuracy and fast response time at high temperatures, ensuring continuous recording of the coating surface temperature change from approximately 200°C to room temperature. Data obtained from the infrared thermometer 43 and the surface temperature sensor can be recorded by the data acquisition system for subsequent analysis. The infrared thermometer 43 can be a non-contact infrared temperature sensor (such as a certain type of infrared temperature sensor module) with a measurement range of 0–250℃ and an accuracy of 0.5%. The support assembly 3 also includes a support base 35 located at the bottom of the support frame 34.

[0027] This invention utilizes a specially designed laboratory apparatus to achieve precise control over the entire process of hot-melt road marking paint, from heating and application to cooling. Compared to existing technologies, this apparatus can strictly control the temperature of the molten paint and maintain a uniform film thickness, simulating cooling conditions in actual road environments, making laboratory test results closer to actual service performance. For example, this apparatus can be used to optimize the glass bead spreading process, accurately assessing the impact of glass bead embedding on retroreflective brightness under different temperature conditions in the laboratory, thereby guiding improvements to paint formulations and construction parameters. Furthermore, by adjusting the bottom water temperature and wind speed, the effects of different seasons and climatic conditions on the initial performance of road markings can be studied.

Claims

1. A laboratory testing device for hot-melt road marking paint, characterized in that: The laboratory testing device for hot melt road marking paint includes a feeding component (1), a molding component (2), a support component (3), and a temperature control component (4); the molding component (2) has a shallow pool-like structure; the molding component (2) is mounted on the support component (3); the feeding component (1) is vertically mounted on the support component (3) and supplies the experimental paint to the molding component (2); the temperature control component (4) is mounted on the feeding component (1), the molding component (2), and the support component (3).

2. The laboratory testing device for hot-melt road marking paint according to claim 1, characterized in that: The temperature control component (4) includes an adjustable speed fan (41), an infrared thermometer (43), a heating temperature sensor, a discharge temperature sensor, a surface temperature sensor, and a water storage tank (42); the adjustable speed fan (41) and the infrared thermometer (43) are mounted on the support component (3); the heating temperature sensor and the discharge temperature sensor are mounted on the feeding component (1); the surface temperature sensor and the water storage tank (42) are mounted on the molding component (2).

3. The laboratory testing device for hot-melt road marking paint according to claim 2, characterized in that: The feeding assembly (1) includes a heating container (11), a control valve (13), and a discharge pipe (14); the heating container (11) is connected to the discharge pipe (14) through the control valve (13); the discharge port of the discharge pipe (14) faces the molding assembly (2) and supplies experimental coatings to the shallow pool of the molding assembly (2); the heating container (11) is vertically mounted on the support assembly (3); the heating temperature sensor is placed inside the heating container (11); the discharge temperature sensor is placed at the discharge port of the discharge pipe (14).

4. The laboratory testing device for hot-melt road marking paint according to claim 3, characterized in that: The feeding assembly (1) also includes a stirring rod (12) and a stirring motor (15); the stirring motor (15) is fixedly mounted on the support assembly (3); the stirring rod (12) is placed inside the heating container (11) along the axial direction of the heating container (11); the stirring motor (15) is connected to the stirring rod (12) and drives the stirring rod (12) to rotate.

5. The laboratory testing device for hot-melt road marking paint according to claim 4, characterized in that: The forming component (2) includes a heater, a forming steel plate (21), and a side wall (22) disposed at the edge of the forming steel plate (21); the side wall (22) and the forming steel plate (21) form a shallow pool-like structure; the forming steel plate (21) is mounted on a support component (3); the heater and the water tank (42) are disposed in parallel at the bottom of the forming steel plate (21); the surface temperature sensor is disposed on the upper surface of the forming steel plate (21).

6. The laboratory testing apparatus for hot-melt road marking paint according to claim 5, characterized in that: The forming component (2) also includes a scraper applicator (26); a groove (23) is provided on the side wall (22) along the length direction of the side wall (22); the lower edge of the groove (23) is at a height higher than the upper surface of the forming steel plate (21); the scraper applicator (26) is embedded in the groove (23) and moves along the axial direction of the groove (23).

7. The laboratory testing device for hot-melt road marking paint according to claim 6, characterized in that: The forming assembly (2) further includes a partition disposed on the forming steel plate (21) along the moving direction of the scraper applicator (26), the ends of the partition being held or embedded in the side wall; the partition is one or more, the partition being a non-perforated partition (24) and / or a perforated partition (25); the heater is an electric heating plate or a heating tube.

8. The laboratory testing apparatus for hot-melt road marking paint according to claim 7, characterized in that: The support assembly (3) includes a support platform (31), a boss (32), a horizontal slide rail (33), and a support frame (34); the formed steel plate (21) is mounted on the support platform (31); the boss (32) is located at the edge of the support platform (31); the axial direction of the boss (32) is perpendicular to the moving direction of the scraper applicator (26); a horizontal slide rail (33) is provided on the boss (32) along the axial direction of the boss (32); the support frame (34) is placed on the horizontal slide rail (33) and slides freely on the horizontal slide rail (33); the feeding assembly (1) is vertically arranged on the support frame (34); the adjustable speed fan (41) and the infrared thermometer (43) are arranged in parallel on the support frame (34).

9. The laboratory testing apparatus for hot-melt road marking paint according to claim 8, characterized in that: The support assembly (3) also includes a support base (35) disposed at the bottom of the support frame (34).

10. The laboratory testing apparatus for hot-melt road marking paint according to any one of claims 2-9, characterized in that: The heating temperature sensor and the discharge temperature sensor are both high-temperature thermocouples or high-temperature platinum resistance thermometers; the water storage tank (42) is equipped with heating elements and cooling elements.

Images