Powder preheating type explosion spraying powder feeding device

Abstract

The invention relates to the technical field of explosion spraying, in particular to a powder preheating type explosion spraying powder feeding device which comprises a powder storage tank, a powder heating device, a powder feeding pipeline, a powder flow control mechanism, a powder conveying pipeline, a powder overflowing device, a powder incidence pipeline and a controller. The powder is preheated, so that the powder reaches a certain temperature before entering the spray gun, the time and energy required by heating in the spray gun are reduced, uniform melting and sufficient acceleration are easier to realize, the generation probability of unmelted particles is reduced, and the compactness and bonding strength of a coating are improved. The spraying effect of difficult-to-process spraying materials with high melting point, poor thermal conductivity and the like is effectively improved, the applicable material range of the explosion spraying process is widened, and the preparation of a novel high-performance coating is promoted. And through real-time monitoring and adjustment of the temperature sensor and the controller, the powder heating temperature can be accurately controlled, the requirements of different spraying materials and technologies for the powder preheating temperature are met, and the stability and reliability of the powder feeding and heating process are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of explosive spraying technology, specifically to a powder preheating explosive spraying powder feeding device, which can preheat the powder before it enters the spray gun, thereby optimizing the performance of the explosive spraying process. Background Technology

[0002] Explosive spraying utilizes the energy generated by a gas explosion to heat powder to a specific temperature and velocity, then sprays it onto the substrate surface to form a coating. Explosive spraying technology boasts the densest and lowest porosity coating among existing thermal spraying technologies. During the spraying process, the initial state of the powder significantly impacts coating quality. Traditional explosive spraying powder feeding devices only provide powder transport and cannot preheat the powder. Cold powder entering the spray gun via the feeding device must rely on the high-temperature gas generated by the explosion to rapidly heat, melt, and accelerate it. This can lead to uneven powder heating, with some powder failing to fully melt due to insufficient heating, forming unmelted particles and reducing coating density and bonding strength. Furthermore, for some spraying materials with high melting points or poor thermal conductivity, contact with high-temperature gas can absorb a large amount of heat, causing a rapid drop in gas temperature. This affects the gas's acceleration effect on the powder, resulting in insufficient particle velocity, impacting coating quality and limiting the application of high-performance wear-resistant coating materials. Summary of the Invention

[0003] The present invention aims to provide a powder preheating explosive spraying powder feeding device, which improves the heating, melting and acceleration effect of the powder during the explosive spraying process by preheating the powder, thereby improving the coating quality, reducing the dependence on explosive energy, and expanding the range of applicable spraying materials.

[0004] To solve this technical problem, the technical solution of the present invention is as follows: A preheating explosive spraying powder feeding device includes: a powder storage tank 1, a powder heating device, a powder feeding pipeline, a powder flow control mechanism, a powder conveying pipeline, a powder overflow device, a powder injection pipeline, and a controller; the powder storage tank is provided with a feeding port at the top and a discharge port at the bottom; a material level sensor 2 is installed on the inner wall of the powder storage tank 1 to monitor the powder filling amount and feed back a signal to the controller 3; the powder heating device is sleeved outside the discharge port of the powder storage tank 1; one end of the powder flow control mechanism is connected to the discharge end of the powder heating device, and the other end is connected to the powder overflow device; the powder conveying pipeline is located outside the powder flow control mechanism; and the powder overflow device is connected to the outside of the preheating explosive spraying powder feeder through a slot.

[0005] The discharge port of the powder storage tank 1 is made of high temperature and wear resistant material, and the inner wall is smooth to reduce powder adhesion and clogging.

[0006] The powder heating device includes a heating chamber 4, heating elements 5, and a temperature sensor 6. The heating chamber 4 is cylindrical, and its inner wall forms a heating space with the outer wall of the powder storage tank outlet. The heating elements 5 are evenly arranged around the heating chamber 4, and the heating temperature is controlled by a controller 3. The heating temperature is 100~200℃. The temperature sensor 6 is installed on the inner wall of the powder storage tank outlet to detect the powder temperature in real time and feed the temperature signal back to the controller 3. The controller 3 automatically adjusts the temperature of the heating elements according to the preset temperature parameters to achieve precise control of the powder heating temperature.

[0007] The heating element 5 is a resistance heating wire or an infrared heating tube.

[0008] The powder overflow device includes a powder feeding slider guide plate 7, a powder feeding slider 8, a pressure spring 9, and a push rod 10. The powder feeding slider guide plate 7 is located at the top of the powder flow control mechanism, with its upper end connected to the discharge end of the powder heating device, its lower end connected to the powder feeding slider 8, and its left end connected to the push rod 10, for connecting the powder heating device and the powder feeding slider. The upper end of the powder feeding slider 8 is connected to the slider guide plate 7, and its lower end is connected to the pressure spring 9.

[0009] The powder feeding slider 8 is a square steel block with powder grooves on its surface. The diameter of the powder grooves on the square steel block is 1.0~3.0mm, the depth is 1.0~3.0mm, and the material is one of stainless steel, chrome-plated steel, or hardened steel. The powder delivery pipeline includes a nitrogen pipe 11 and a nitrogen pipe connector 12. The nitrogen pipe 11 is used to blow powder into the explosive spray gun through the powder injection pipeline and to clean the powder feeding slider 8. The pressure inside the nitrogen pipe 11 is 1.10~1.20 bar.

[0010] The powder overflow device includes a powder overflow tray 13 and a powder overflow tank 14. The powder overflow tray 13 is externally connected to the preheated explosive spray powder feeder via a slot and is used to receive powder outside the powder tank that enters from the outlet of the powder storage tank 1. The powder overflow tank 14 is located below the powder overflow tray 13 and is used to store powder that leaks out of the powder overflow tray 13.

[0011] The controller uses a programmable logic controller (PLC) to control the powder feeding time within one explosive spraying cycle through a powder feeder sensor with a solenoid valve. It also integrates feedback information from the material level sensor 2 and the temperature sensor 6 to coordinate the operation of the heating element 5, thereby achieving automated and precise control of the powder feeding and heating process.

[0012] The present invention has the following beneficial effects: 1. Improve coating quality. Preheating the powder ensures it reaches a certain temperature before entering the spray gun, reducing the time and energy required for heating within the gun. This facilitates more uniform melting and faster melting, lowers the probability of unmelted particles, and improves coating density and bonding strength.

[0013] 2. Expand material applications. Effectively improve the spraying effect of difficult-to-process spraying materials such as high melting point and poor thermal conductivity, broaden the range of materials that can be applied to explosive spraying process, and promote the preparation of new high-performance coatings.

[0014] 3. Precise temperature control. Through real-time monitoring and adjustment by temperature sensors and controllers, the powder heating temperature can be precisely controlled to adapt to the powder preheating temperature requirements of different coating materials and processes, ensuring the stability and reliability of the powder feeding and heating process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions implemented in this invention, the accompanying drawings used in the embodiments of this invention will be briefly explained below. Obviously, the drawings described below are merely some embodiments of this invention. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a powder preheating explosive spraying powder feeding device.

[0017] The components are: 1-powder storage tank, 3-controller, nitrogen pipe, 4-heating space, 5-heating element, 6-temperature sensor, 7-slider guide plate, 8-powder feeding slider, 9-pressure spring, 10-push rod, 11-nitrogen pipe, 12-nitrogen pipe connector, 13-overflow powder tray, 14-overflow powder tank. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1 As shown, a preheating explosive spraying powder feeding device includes: a powder storage tank 1, a powder heating device, a powder feeding pipeline, a powder flow control mechanism, a powder conveying pipeline, a powder overflow device, a powder injection pipeline, and a controller; the powder storage tank is provided with a feeding port at the top and a discharge port at the bottom; a material level sensor 2 is installed on the inner wall of the powder storage tank 1 to monitor the powder filling amount and feed back the signal to the controller 3; the powder heating device is sleeved outside the discharge port of the powder storage tank 1; one end of the powder flow control mechanism is connected to the discharge end of the powder heating device, and the other end is connected to the powder overflow device; the powder conveying pipeline is located outside the powder flow control mechanism; and the powder overflow device is connected to the outside of the preheating explosive spraying powder feeder through a slot.

[0019] The discharge port of the powder storage tank 1 is made of high temperature and wear resistant material, and the inner wall is smooth to reduce powder adhesion and clogging.

[0020] The powder heating device includes a heating chamber 4, heating elements 5, and a temperature sensor 6. The heating chamber 4 is cylindrical, and its inner wall forms a heating space with the outer wall of the powder storage tank outlet. The heating elements 5 are evenly arranged around the heating chamber 4, and the heating temperature is controlled by a controller 3. The heating temperature is 100~200℃. The temperature sensor 6 is installed on the inner wall of the powder storage tank outlet to detect the powder temperature in real time and feed the temperature signal back to the controller 3. The controller 3 automatically adjusts the temperature of the heating elements according to the preset temperature parameters to achieve precise control of the powder heating temperature.

[0021] The heating element 5 is a resistance heating wire or an infrared heating tube.

[0022] The powder overflow device includes a powder feeding slider guide plate 7, a powder feeding slider 8, a pressure spring 9, and a push rod 10. The powder feeding slider guide plate 7 is located at the top of the powder flow control mechanism, with its upper end connected to the discharge end of the powder heating device, its lower end connected to the powder feeding slider 8, and its left end connected to the push rod 10, for connecting the powder heating device and the powder feeding slider. The upper end of the powder feeding slider 8 is connected to the slider guide plate 7, and its lower end is connected to the pressure spring 9.

[0023] The powder feeding slider 8 is a square steel block with powder grooves on its surface. The diameter of the powder grooves on the square steel block is 1.0~3.0mm, the depth is 1.0~3.0mm, and the material is one of stainless steel, chrome-plated steel, or hardened steel. The powder delivery pipeline includes a nitrogen pipe 11 and a nitrogen pipe connector 12. The nitrogen pipe 11 is used to blow powder into the explosive spray gun through the powder injection pipeline and to clean the powder feeding slider 8. The pressure inside the nitrogen pipe 11 is 1.10~1.20 bar.

[0024] The powder overflow device includes a powder overflow tray 13 and a powder overflow tank 14. The powder overflow tray 13 is externally connected to the preheated explosive spray powder feeder via a slot and is used to receive powder outside the powder tank that enters from the outlet of the powder storage tank 1. The powder overflow tank 14 is located below the powder overflow tray 13 and is used to store powder that leaks out of the powder overflow tray 13.

[0025] The controller uses a programmable logic controller (PLC) to control the powder feeding time within one explosive spraying cycle through a powder feeder sensor with a solenoid valve. It also integrates feedback information from the material level sensor 2 and the temperature sensor 6 to coordinate the operation of the heating element 5, thereby achieving automated and precise control of the powder feeding and heating process.

[0026] Example 1 This embodiment provides a powder preheating explosive spraying powder feeding device, including a powder storage tank 1, a powder heating device, a powder feeding pipeline, a powder flow control mechanism, a powder conveying pipeline, a powder overflow device, a powder injection pipeline, and a controller 3.

[0027] The powder storage tank has a feeding port at the top and a discharge port at the bottom. A material level sensor 2 is installed on the inner wall of the powder storage tank, and the discharge port of the powder storage tank 1 is made of stainless steel.

[0028] The powder heating device is installed outside the outlet of the powder storage tank 1. The inner wall of the heating chamber and the outer wall of the outlet of the powder storage tank form a heating space 4. The heating element 5 is a resistance heating wire, which is evenly arranged in the heating space 4. The heating temperature is controlled by the controller 3 and the heating temperature is 100℃. The temperature sensor 6 is installed on the inner wall of the outlet of the powder storage tank to detect the powder temperature in real time and feed the temperature signal back to the controller.

[0029] One end of the powder flow control mechanism is connected to the discharge end of the powder heating device, and the other end is connected to the overflow device. The powder feeding slider guide plate 7 is located at the top of the powder flow control mechanism, with its upper end connected to the discharge end of the powder heating device, its lower end connected to the powder feeding slider 8, and its left end connected to the push rod 10, used to connect the powder heating device and the powder feeding slider 8. The powder feeding slider 8 has a powder groove diameter of 1.5mm and a depth of 1.5mm, is made of stainless steel, and its upper end is connected to the slider guide plate 7, while its lower end is connected to the clamping spring 9. The powder conveying pipeline is located outside the powder flow control mechanism, and the pressure in the nitrogen pipe 11 is 1.15 bar. The overflow tray 13 is connected to the outside of the preheated explosive spray powder feeder through a slot, and the overflow tank 14 is located below the overflow tray 13.

[0030] The controller 3 uses a programmable logic controller (PLC) to control the powder feeding time within one explosive spraying cycle through a powder feeder sensor with a solenoid valve. At the same time, it integrates feedback information from the material level sensor 2, temperature sensor 3, etc., and coordinates the operation of the heating element.

[0031] Example 2 This embodiment provides a powder preheating explosive spraying powder feeding device, including a powder storage tank 1, a powder heating device, a powder feeding pipeline, a powder flow control mechanism, a powder conveying pipeline, a powder overflow device, a powder injection pipeline, and a controller 3.

[0032] The powder storage tank 1 is equipped with a feeding port at the top and a discharge port at the bottom. A material level sensor 2 is installed on the inner wall of the powder storage tank 1, and the discharge port of the powder storage tank is made of stainless steel.

[0033] The powder heating device is installed outside the outlet of the powder storage tank. The inner wall of the heating chamber and the outer wall of the outlet of the powder storage tank form a heating space 4. The heating element 5 is an infrared heating tube, which is evenly arranged in the heating space 4. The heating temperature is controlled by the controller and is 150℃. The temperature sensor 6 is installed on the inner wall of the outlet of the powder storage tank to detect the powder temperature in real time and feed the temperature signal back to the controller.

[0034] One end of the powder flow control mechanism is connected to the discharge end of the powder heating device, and the other end is connected to the overflow device. The powder feeding slider guide plate 7 is located at the top of the powder flow control mechanism, with its upper end connected to the discharge end of the powder heating device, its lower end connected to the powder feeding slider 8, and its left end connected to the push rod 10, used to connect the powder heating device and the powder feeding slider. The powder feeding slider 8 has a powder groove diameter of 2.0 mm and a depth of 2.0 mm, is made of chrome-plated steel, and its upper end is connected to the slider guide plate 7, while its lower end is connected to the compression spring 9. The powder conveying pipeline is located outside the powder flow control mechanism, and the pressure inside the nitrogen pipe 11 is 1.20 bar. The overflow tray 13 is connected to the outside of the preheated explosive spray powder feeder through a slot, and the overflow tank 14 is located below the overflow tray.

[0035] The controller 3 uses a programmable logic controller (PLC) to control the powder feeding time within one explosive spraying cycle through a powder feeder sensor with a solenoid valve. At the same time, it integrates feedback information from the material level sensor 2, temperature sensor 6, etc., and coordinates the operation of the heating element.

Claims

1. A preheating explosive spraying powder feeding device, characterized in that, include: The powder storage tank (1), powder heating device, powder feeding pipeline, powder flow control mechanism, powder conveying pipeline, powder overflow device, powder injection pipeline, and controller are provided. The powder storage tank is provided with a feeding port at the top and a discharge port at the bottom. A material level sensor (2) is installed on the inner wall of the powder storage tank (1) to monitor the powder filling amount and feed back the signal to the controller (3). The powder heating device is sleeved outside the discharge port of the powder storage tank (1). One end of the powder flow control mechanism is connected to the discharge end of the powder heating device, and the other end is connected to the powder overflow device. The powder conveying pipeline is located outside the powder flow control mechanism. The powder overflow device is connected to the outside of the preheated explosive spray powder feeder through a slot.

2. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The discharge port of the powder storage tank (1) is made of high temperature and wear resistant material, and the inner wall is smooth to reduce powder adhesion and blockage.

3. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The powder heating device includes a heating chamber (4), a heating element (5), and a temperature sensor (6). The heating chamber (4) is cylindrical, and its inner wall forms a heating space with the outer wall of the powder storage tank outlet. The heating element (5) is evenly arranged around the heating chamber (4), and the heating temperature is controlled by the controller (3). The heating temperature is 100~200℃. The temperature sensor (6) is installed on the inner wall of the powder storage tank (1) outlet to detect the powder temperature in real time and feed the temperature signal back to the controller (3). The controller (3) automatically adjusts the temperature of the heating element according to the preset temperature parameters to achieve precise control of the powder heating temperature.

4. The preheating explosive spraying powder feeding device according to claim 3, characterized in that, The heating element (5) is a resistance heating wire or an infrared heating tube.

5. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The powder overflow device includes a powder feeding slider guide plate (7), a powder feeding slider (8), a pressure spring (9), and a push rod (10). The powder feeding slider guide plate (7) is located at the top of the powder flow control mechanism. Its upper end is connected to the discharge end of the powder heating device, its lower end is connected to the powder feeding slider (8), and its left end is connected to the push rod (10). It is used to connect the powder heating device and the powder feeding slider. The upper end of the powder feeding slider (8) is connected to the powder feeding slider guide plate (7), and its lower end is connected to the pressure spring (9).

6. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The powder feeding slider (8) is a square steel block with a powder groove on its surface. The diameter of the powder groove of the square steel block with the powder groove is 1.0~3.0mm, the depth is 1.0~3.0mm, and the material is one of stainless steel, chrome-plated steel, or quenched steel.

7. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The powder delivery pipeline includes a nitrogen pipe (11) and a nitrogen pipe connector (12). The nitrogen pipe (11) is used to blow powder into the explosive spray gun through the powder injection pipeline and to clean the powder feeding slider (8). The pressure inside the nitrogen pipe (11) is 1.10~1.20 bar.

8. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The powder overflow device includes a powder overflow tray (13) and a powder overflow tank (14). The powder overflow tray (13) is connected to the outside of the preheated explosive spray powder feeder through a slot and is used to receive powder outside the powder tank that enters from the outlet of the powder storage tank (1). The powder overflow tank (14) is located below the powder overflow tray (13) and is used to store the powder that leaks out of the powder overflow tray (13).

9. The preheating explosive spraying powder feeding device according to claim 1, characterized in that, The controller adopts a programmable logic controller (PLC), which controls the powder feeding time within one explosion spraying cycle through a powder feeder sensor with a solenoid valve. At the same time, it integrates feedback information from the material level sensor (2) and the temperature sensor (6) to coordinate the operation of the heating element (5) and realize the automated and precise control of the powder feeding and heating process.

Images