Cold spraying system and control method

Abstract

The invention relates to the technical field of cold spraying, and discloses a cold spraying system and a control method.The cold spraying system comprises a gas cylinder, an airflow adjusting device, a spraying gun, a powder feeding device, a heating device, a water cooling device and a controller, an air pump and an air source are arranged in the gas cylinder, and a first switch valve and a second switch valve are fixedly installed in the air pump; the airflow adjusting device comprises a main air path and a powder feeding air path, the two ends of the main air path are fixedly connected to the interior of the air pump and the tail of the spray gun respectively, a main air proportional valve is fixedly installed in the main air path, and the input end of the main air proportional valve is electrically connected to the output end of the spray gun. Compared with the prior art, the spraying device has the following advantages and effects that the two different gas sources can be selected for gas supply by achieving switching of the two different gas sources, the stability of the spraying quality is achieved by monitoring the gas flow, the gas temperature and the cooling water temperature, the failure rate is reduced, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cold spraying technology, and in particular to a cold spraying system and control method. Background Technology

[0002] Cold spraying is a technique that uses preheated high-speed gas (nitrogen or helium) to accelerate and heat the raw material powder, which then impacts the substrate in a solid form, causing the substrate and particles to undergo severe plastic deformation to achieve bonding. As a low-temperature processing technology, cold spraying has a smaller thermal impact on raw materials, and the resulting coating has low porosity, high bonding strength, and is under compressive stress, thus possessing good mechanical, thermal, and electrical properties. Cold spraying process uses high-speed particle impact to achieve bonding. Particle velocity and temperature have a significant impact on bonding quality. Therefore, improving particle velocity and temperature stability, as well as the stability of the spray gun cooling environment, is crucial. The stability and accuracy of the powder delivery airflow are crucial. The stability of the main airflow directly affects the particle velocity and temperature. The temperature control method also affects the particle temperature, and the stability of the cooling system also affects the particle temperature stability. In the existing technology, the stability and accuracy of the powder delivery airflow need to be improved. Therefore, it is necessary to propose a cold spraying system and control method to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a cold spraying system and control method that improves the stability of gas flow rate, gas temperature, and cooling temperature, thereby effectively improving the stability of spraying quality, reducing the failure rate, and increasing efficiency.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a cold spraying system, comprising a gas cylinder, an airflow regulating device, a spray gun, a powder feeding device, a heating device, a water cooling device, and a controller. The gas cylinder contains an air pump and an air source. The air pump contains a first switching valve and a second switching valve. The airflow regulating device includes a main air path and a powder feeding air path. The two ends of the main air path are respectively fixedly connected to the inside of the air pump and the tail of the spray gun. The main air path contains a main air proportioning valve, and the input end of the main air proportioning valve is electrically connected to… At the output end of the spray gun, the powder feeding device includes a powder feeder and a powder feeding proportioning valve. The powder feeding proportioning valve is fixedly installed at the powder outlet of the powder feeder. The powder feeding air passage inside the airflow regulating device is connected to the powder feeder. The powder feeder is fixedly connected to the powder outlet pipe. The powder outlet pipe is fixedly connected to the inside of the spray gun. The heating device includes a heating power supply, a heater, and a heating circuit. The heating power supply and the heater are bidirectionally electrically connected through the heating circuit. The water cooling device includes a water chiller and a cooling water circuit. The water chiller is fixedly connected to the spray gun through the cooling water circuit.

[0005] By adopting the above technical solution, the main air path and the powder delivery air path are controlled by switch valve one and switch valve two respectively. Two different air sources can be selected for air delivery. The air source inside the main air path enters the heater inside the spray gun for heating. The powder delivery air path carries particles through the powder feeder and enters the interior of the spray gun and merges with the main air path. Then it is sprayed out through the spray gun. The water chiller sends cooling water into the interior of the spray gun for cooling through the cooling water path. The controller adjusts the current output of the heating power supply through current command to control the heating power of the heater, thereby controlling the gas temperature inside the spray gun. In order to accurately control the particle temperature, the heating device uses the spray gun and the main air path as temperature control targets.

[0006] A further feature of the present invention is that the output terminal of the controller is electrically connected to the input terminal of the main air proportional valve, and the controller sends a pressure control command to the main air proportional valve to monitor the main air flow and main air pressure of the spray gun.

[0007] By adopting the above technical solution, the main air proportional valve uses a controller to achieve pressure control. The pressure detection point is located inside the spray gun. Through main air flow monitoring and main air pressure monitoring, it plays an abnormal monitoring role when the air path is blocked or the flow is abnormal.

[0008] A further configuration of the present invention is as follows: the output terminal of the controller is electrically connected to the input terminal of the heating power supply, and the controller sends a current control command to the heating power supply to detect the heater temperature and the gas temperature of the spray gun.

[0009] By adopting the above technical solution, in order to prevent the heater from being damaged due to excessive short-term power during the adjustment process, the controller detects the temperature of the heater. When the heater temperature approaches the safe value, the protection program is activated to avoid failure.

[0010] A further provision of the present invention is that the output terminal of the controller is electrically connected to the input terminal of the water chiller, and the controller sends water cooling control commands to the water chiller to detect the outlet water temperature, the return water temperature, and the return water flow rate.

[0011] By adopting the above technical solution, the controller performs outlet water temperature detection, return water temperature detection, and return water flow monitoring for the water chiller. The outlet water temperature detection is used for cooling water temperature control feedback, the return water flow can monitor return water leakage, and the return water temperature monitoring can understand the cooling status of the spray gun. When the temperature is abnormal, the water temperature can be adjusted to ensure the cooling effect.

[0012] A further feature of the present invention is that the output terminal of the controller is electrically connected to the input terminal of the powder feeding proportional valve, and the controller sends a flow control command to the powder feeding proportional valve to monitor the powder feeding flow and the powder feeding pressure of the powder feeder.

[0013] By adopting the above technical solution, in order to ensure stable powder feeding, the powder feeder uses a powder feeding proportional valve to achieve flow control. The flow detection point is located at the front end of the powder feeder. The controller monitors the powder feeding flow and powder feeding pressure of the powder feeder. When the powder feeding air path is abnormal, the pressure monitoring can be used as a monitoring basis to avoid equipment damage.

[0014] A further feature of the present invention is that the cooling water circuit is a circulation pipeline, and the cooling water circulates inside the water chiller through the cooling water circuit.

[0015] By adopting the above technical solution, the cooling water circuit is used as a circulation pipeline, so that the cooling water enters the interior of the spray gun through the cooling water circuit and then flows back to the interior of the water cooler.

[0016] The beneficial effects of this invention are: This invention enables the switching between two different gas sources, allowing for the selection of two different gas sources for gas delivery. Furthermore, by monitoring gas flow rate, gas temperature, and cooling water temperature, it ensures the stability of spray coating quality, reduces the failure rate, and improves efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the cold spraying control system of the present invention; Figure 2 This is a schematic diagram of the gas path control process of the present invention; Figure 3 This is a schematic diagram of the temperature control process of the present invention; Figure 4 This is a schematic diagram of the main gas control process of the present invention; Figure 5 This is a flowchart of the powder feeding gas control process of the present invention; Figure 6 This is a flowchart of the cooling water control process of the present invention.

[0019] In the diagram, 1 represents a gas cylinder; 1-1 represents valve one; and 1-2 represents valve two. 2. Airflow regulating device; 2-1. Main air passage; 2-2. Powder delivery air passage; 2-3. Main air proportional valve; 3. Spray gun; 4. Powder feeding device; 4-1. Powder feeder; 4-2. Powder feeding proportioning valve; 4-3. Powder outlet pipeline; 5. Heating device; 5-1. Heating power supply; 5-2. Heater; 5-3. Heating circuit; 6. Water cooling system; 6-1. Water chiller; 6-2. Cooling water circuit; 7. Controller. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. 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.

[0021] A cold spray coating system includes the following specific embodiments: Please refer to Figure 1-6 A cold spraying system includes a gas cylinder 1, an airflow regulating device 2, a spray gun 3, a powder feeding device 4, a heating device 5, a water cooling device 6, and a controller 7. The gas cylinder 1 contains an air pump and an air source. The air pump has two valves, a first valve 1-1 and a second valve 1-2, fixedly installed inside. The airflow regulating device 2 includes a main air path 2-1 and a powder feeding air path 2-2. The two ends of the main air path 2-1 are fixedly connected to the inside of the air pump and the tail of the spray gun 3, respectively. A main air proportioning valve 2-3 is fixedly installed inside the main air path 2-1, and its input end is electrically connected to the output end of the spray gun 3. The powder feeding device 4 includes a powder feeder 4-1 and a powder delivery device 4-2. Powder proportioning valve 4-2 is fixedly installed at the powder outlet of powder feeder 4-1. The powder feeding air passage 2-2 inside the airflow regulating device 2 is connected to powder feeder 4-1. The powder feeder 4-1 is fixedly connected to the powder outlet pipe 4-3 inside the powder outlet pipe 4-3. The powder outlet pipe 4-3 is fixedly connected to the inside of spray gun 3. Heating device 5 includes heating power supply 5-1, heater 5-2 and heating line 5-3. Heating power supply 5-1 and heater 5-2 are bidirectionally electrically connected through heating line 5-3. Water cooling device 6 includes water chiller 6-1 and cooling water passage 6-2. Water chiller 6-1 is fixedly connected to spray gun 3 through cooling water passage 6-2. Furthermore, the output of controller 7 is electrically connected to the input of the main gas proportional valve 2-3. Controller 7 sends pressure control commands to the main gas proportional valve 2-3, thereby monitoring the main gas flow and pressure of the spray gun 3. The output of controller 7 is also electrically connected to the input of the heating power supply 5-1. Controller 7 sends current control commands to the heating power supply 5-1, thereby detecting the heater temperature of heater 5-2 and the gas temperature of the spray gun 3. The output of controller 7 is also electrically connected to the water chiller 6-1. The input terminal of the controller 7 sends a water cooling control command to the water chiller 6-1, thereby detecting the outlet water temperature, return water temperature, and return water flow of the water chiller 6-1. The output terminal of the controller 7 is electrically connected to the input terminal of the powder feeding proportional valve 4-2, and sends a flow control command to the powder feeding proportional valve 4-2, thereby monitoring the powder feeding flow and powder feeding pressure of the powder feeder 4-1. The cooling water circuit 6-2 is a circulation pipeline, and the cooling water circulates inside the water chiller 6-1 through the cooling water circuit 6-2. A control method for a cold spraying system includes the following steps: S1: The main air passage 2-1 and the powder delivery air passage 2-2 are controlled by the opening and closing of the switch valve 1-1 and the switch valve 2-2. The main air passage 2-1 and the powder delivery air passage 2-2 deliver two different air sources. The main air passage 2-1 goes directly into the interior of the spray gun 3. The powder delivery air passage 2-2 carries particles through the powder feeder 4-1. The air source inside the main air passage 2-1 is heated by the heater 5-2. The air sources inside the main air passage 2-1 and the powder delivery air passage 2-2 are mixed inside the spray gun 3 and then sprayed out through the spray gun 3. S2: The water chiller 6-1 cools the cooling water. The cooling water flows through the cooling water passage 6-2 to the inside of the spray gun 3 and then flows back inside the water chiller 6-1, so that the spray gun 3 can be cooled down quickly to achieve a cooling effect. S3: Controller 7 sends control commands to main gas proportional valve 2-3, heating power supply 5-1, water chiller 6-1 and powder delivery proportional valve 4-2 respectively, thereby monitoring main gas flow rate, main gas pressure, gas temperature, outlet water temperature, return water temperature, return water flow rate, powder delivery flow rate and powder delivery pressure. S4: The two ends of the cooling water circuit 6-2 are respectively set at the outlet and inlet of the water chiller 6-1. After the cooling water is cooled inside the spray gun 3, it will flow back to the inside of the water chiller 6-1, so that the cooling water can circulate inside the water chiller 6-1. Specifically, the air supply input of the main air path 2-1 and the powder delivery air path 2-2 is controlled by switch valve 1-1 and switch valve 2-2 respectively. Two different air sources can be selected for air supply. The air source inside the main air path 2-1 enters the heater 5-2 inside the spray gun 3 for heating. The powder delivery air path 2-2, after being carried by the powder feeder 4-1, enters the interior of the spray gun 3 and merges with the main air path 2-1, and then is sprayed out through the spray gun 3. The water chiller 6-1 sends cooling water into the interior of the spray gun 3 through the cooling water path 6-2 for cooling. The controller 7 adjusts the heating power supply 5- through current commands. The current output of 1 controls the heating power of heater 5-2, thereby controlling the gas temperature inside spray gun 3. To accurately control the particle temperature, heating device 5 uses spray gun 3 and main gas path 2-1 as temperature control targets. The main gas proportional valve 2-3 uses controller 7 for pressure control. The pressure detection point is located inside spray gun 3. Through main gas flow monitoring and main gas pressure monitoring, it plays an abnormal monitoring role when the gas path is blocked or the flow is abnormal. To prevent heater 5-2 from being damaged due to excessive short-term power during adjustment, the controller 7 controls the temperature of the main gas path 2-1. Controller 7 monitors the temperature of heater 5-2. When the temperature of heater 5-2 approaches a safe value, a protection program is activated to prevent malfunction. Controller 7 monitors the outlet water temperature, return water temperature, and return water flow of water chiller 6-1. The outlet water temperature is used for cooling water temperature control feedback. The return water flow can monitor for return water leakage. The return water temperature monitoring can provide information on the cooling status of spray gun 3. In case of abnormal temperature, the water temperature can be adjusted to ensure cooling effect. To ensure stable powder feeding, powder feeder 4-1 uses a powder feeding proportional valve 4-2 to achieve flow control. The flow detection point is located at the powder feeding point. At the front end of the powder feeder 4-1, the controller 7 monitors the powder feeding flow and pressure of the powder feeder 4-1. When the powder feeding air path is abnormal, the pressure monitoring can be used as a monitoring basis to avoid equipment damage. By realizing the switching of two different air sources, two different air sources can be selected for air supply. Furthermore, by monitoring the gas flow, gas temperature, and cooling water temperature, the stability of the spraying quality is achieved, reducing the failure rate and improving efficiency. The cooling water path 6-2 serves as a circulation pipeline, allowing the cooling water to enter the interior of the spray gun 3 through the cooling water path 6-2 and then flow back to the interior of the water chiller 6-1. In this invention, the air supply input of the main air path 2-1 and the powder delivery air path 2-2 is controlled by switching valve 1-1 and switching valve 2-2 respectively. Two different air sources can be selected for air supply. The air source inside the main air path 2-1 enters the heater 5-2 inside the spray gun 3 for heating. The powder delivery air path 2-2, after being carried by the powder feeder 4-1, enters the interior of the spray gun 3 and merges with the main air path 2-1, and then is sprayed out through the spray gun 3. The water chiller 6-1 sends cooling water into the interior of the spray gun 3 through the cooling water path 6-2 for cooling. The controller 7 controls the air supply input. An overcurrent command adjusts the current output of the heating power supply 5-1 to control the heating power of the heater 5-2, thereby controlling the gas temperature inside the spray gun 3. To accurately control the particle temperature, the heating device 5 uses the spray gun 3 and the main gas path 2-1 as temperature control targets. The main gas proportional valve 2-3 uses a controller 7 for pressure control. The pressure detection point is located inside the spray gun 3. Through main gas flow monitoring and main gas pressure monitoring, it plays an abnormal monitoring role when the gas path is blocked or the flow is abnormal. To prevent excessive power during adjustment, [further measures are taken]. The heater 5-2 overheated and was damaged. The controller 7 monitors the temperature of heater 5-2. When the temperature approaches a safe value, a protection program is activated to prevent further damage. The controller 7 monitors the outlet water temperature, return water temperature, and return water flow of the water chiller 6-1. The outlet water temperature is used for cooling water temperature control feedback. The return water flow rate can monitor for leaks. The return water temperature monitoring provides information on the cooling status of the spray gun 3. In case of abnormal temperatures, the water temperature can be adjusted to ensure cooling effectiveness. To ensure stable powder feeding, the powder feeder 4-1 uses a proportional powder valve 4-2 for flow control. The flow detection point is located at the front end of the powder feeder 4-1. The controller 7 monitors the powder feeding flow and pressure of the powder feeder 4-1. When the powder feeding air path is abnormal, pressure monitoring can be used as a basis for monitoring to prevent equipment damage. By switching between two different air sources, two different air sources can be selected for air supply. Monitoring the gas flow rate, gas temperature, and cooling water temperature ensures stable spraying quality, reduces the failure rate, and improves efficiency.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold spraying system, comprising a gas cylinder (1), an airflow regulating device (2), a spray gun (3), a powder feeding device (4), a heating device (5), a water cooling device (6), and a controller (7), characterized in that: The gas cylinder (1) is equipped with an air pump and an air source. The air pump is equipped with a first switch valve (1-1) and a second switch valve (1-2). The airflow regulating device (2) includes a main air path (2-1) and a powder delivery air path (2-2). The two ends of the main air path (2-1) are fixedly connected to the inside of the air pump and the tail of the spray gun (3), respectively. The main air proportional valve (2-3) is fixedly installed inside the main air path (2-1). The input end of the main air proportional valve (2-3) is electrically connected to the output end of the spray gun (3). The powder delivery device (4) includes a powder feeder (4-1) and a powder delivery proportional valve (4-2). The powder delivery proportional valve (4-2) is fixedly installed on the powder feeder (4-1). At the powder outlet, the powder feeding air passage (2-2) inside the airflow regulating device (2) is connected to the powder feeder (4-1). The powder feeder (4-1) is fixedly connected to the powder outlet pipe (4-3). The powder outlet pipe (4-3) is fixedly connected to the inside of the spray gun (3). The heating device (5) includes a heating power supply (5-1), a heater (5-2), and a heating line (5-3). The heating power supply (5-1) and the heater (5-2) are bidirectionally electrically connected through the heating line (5-3). The water cooling device (6) includes a water chiller (6-1) and a cooling water passage (6-2). The water chiller (6-1) is fixedly connected to the spray gun (3) through the cooling water passage (6-2).

2. The cold spraying system according to claim 1, characterized in that: The output of the controller (7) is electrically connected to the input of the main gas proportional valve (2-3). The controller (7) sends a pressure control command to the main gas proportional valve (2-3) to monitor the main gas flow and main gas pressure of the spray gun (3).

3. The cold spraying system according to claim 1, characterized in that: The output of the controller (7) is electrically connected to the input of the heating power supply (5-1). The controller (7) sends a current control command to the heating power supply (5-1) to detect the heater temperature of the heater (5-2) and the gas temperature of the spray gun (3).

4. The cold spraying system according to claim 1, characterized in that: The output of the controller (7) is electrically connected to the input of the water chiller (6-1). The controller (7) sends water cooling control commands to the water chiller (6-1) to detect the outlet water temperature, the return water temperature and the return water flow of the water chiller (6-1).

5. A cold spraying system according to claim 1, characterized in that: The output of the controller (7) is electrically connected to the input of the powder feeding proportional valve (4-2). The controller (7) sends a flow control command to the powder feeding proportional valve (4-2) to monitor the powder feeding flow and the powder feeding pressure of the powder feeder (4-1).

6. A cold spraying system according to claim 1, characterized in that: The cooling water circuit (6-2) is a circulation pipeline, through which cooling water circulates within the water chiller (6-1).

7. A control method for a cold spraying system, characterized in that: The following steps are included: S1: The main air path (2-1) and the powder delivery air path (2-2) are controlled by the opening and closing of the switch valve one (1-1) and the switch valve two (1-2). The main air path (2-1) and the powder delivery air path (2-2) deliver two different air sources. The main air path (2-1) is directly connected to the inside of the spray gun (3). The powder delivery air path (2-2) carries particles through the powder feeder (4-1). The air source inside the main air path (2-1) is heated by the heater (5-2). The air sources inside the main air path (2-1) and the powder delivery air path (2-2) are mixed inside the spray gun (3) and then sprayed out through the spray gun (3). S2: The water chiller (6-1) cools the cooling water. The cooling water flows through the cooling water passage (6-2) to the inside of the spray gun (3) and then flows back inside the water chiller (6-1), so that the spray gun (3) cools down quickly to achieve a cooling effect. S3: The controller (7) sends control commands to the main gas proportional valve (2-3), heating power supply (5-1), water chiller (6-1) and powder delivery proportional valve (4-2) respectively, thereby monitoring the main gas flow rate, main gas pressure, gas temperature, outlet water temperature, return water temperature, return water flow rate, powder delivery flow rate and powder delivery pressure. S4: The two ends of the cooling water circuit (6-2) are respectively set at the outlet and inlet of the water chiller (6-1). After the cooling water is cooled inside the spray gun (3), it will flow back to the inside of the water chiller (6-1) so that the cooling water can circulate inside the water chiller (6-1).

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