A spray gun and a cold spraying apparatus having the spray gun.

Abstract

This invention discloses a spray gun and a cold spraying device incorporating the spray gun. The spray gun includes a spray gun body, a nozzle, a powder channel, a filter assembly, an air purifier, and a cooling structure. The nozzle is connected to one end of the spray gun body. The powder channel is disposed within the spray gun body, with one end connected to the nozzle and the other end having a powder inlet. The filter assembly is installed at the powder inlet. The air purifier is located at one end of the spray gun body and is sealed and connected to the powder channel. The cooling structure is integrated inside the spray gun body and fits snugly against the powder channel. The spray gun and cold spraying device of this invention effectively remove impurities from powder and air through the dual purification effects of the spray gun filter assembly and the air purifier. Simultaneously, the circulating cooling function of the cooling structure precisely controls the operating temperature of the spray gun, significantly extending the service life of the spray gun and equipment and ensuring long-term stable operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of spraying technology, and more specifically to a spray gun and a cold spraying device having the spray gun. Background Technology

[0002] In actual operation, traditional cold spray guns are subject to continuous impact and friction from high-speed airflow (typically reaching several Mach) and high-concentration powder particles. This easily leads to localized heat accumulation in key areas such as the nozzle exit and the inner cavity of the spray gun, forming localized high-temperature zones. These localized high temperatures not only cause thermal deformation and accelerated wear of the nozzle, but also cause some fusible powder particles to pre-melt prematurely, altering the physical properties of the powder. This results in quality defects in the coating, such as increased porosity, decreased bonding strength, and excessive surface roughness, severely affecting the performance stability of the finished product. Furthermore, the prolonged exposure of the spray gun body and internal components to these localized high temperatures accelerates component aging and damage, significantly shortening the overall lifespan of the spray gun and even the cold spray equipment, increasing equipment maintenance costs and downtime for repairs, and reducing production efficiency.

[0003] Therefore, the present invention provides a spray gun and a cold spraying device having the spray gun to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose a spray gun and a cold spraying device with the spray gun, thereby solving the technical problems of rapid nozzle wear and short overall service life in existing cold spraying devices.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a spray gun, comprising: The spray gun itself; The nozzle is connected to one end of the spray gun body; A powder channel is provided inside the spray gun body, one end of the powder channel is connected to the nozzle, and the other end is provided with a powder inlet; A filter assembly is installed at the powder inlet; An air purifier is disposed at one end of the spray gun body and is in sealed communication with the powder channel; and The cooling structure is integrated into one end of the spray gun body and fits into the powder channel.

[0006] In some embodiments, the nozzle is configured as a Laval nozzle and is threadedly sealed to the spray gun body, with a high-temperature resistant sealing gasket provided at the connection.

[0007] In some embodiments, the filter assembly includes a filter housing, a filter element, and a sealing cap. The bottom of the filter housing is sealed to the powder inlet. The filter element is installed inside the filter housing. The sealing cap is sealed to the upper end of the filter housing and has a feed inlet.

[0008] In some embodiments, the cooling device includes a cooling channel, an inlet pipe, an outlet pipe, and heat sinks. The cooling channel is located outside the powder channel. One end of the inlet pipe is connected to an external cold water supply device, and the other end is connected to the top of the cooling channel. One end of the outlet pipe is connected to the bottom of the cooling channel, and the other end is connected to the cold water supply device, forming a circulating cooling loop. The heat sinks are evenly distributed outside the cooling channel.

[0009] Secondly, the present invention also provides a cold spraying apparatus, comprising: The spray gun described in any of the above items; A powder conveying device is connected to the feed inlet of the filter assembly of the spray gun; A gas supply device is sealed and connected to the gas purifier of the spray gun; A movable support, on which the spray gun can be detachably fixed; A material mounting base, disposed on one side of the movable bracket, is used to fix the workpiece to be sprayed; and A sealed chamber is provided, in which the spray gun and the movable bracket are disposed. The material mounting base is connected to one end of the sealed chamber, and one end of the material mounting base is disposed in the spraying direction of the spray gun.

[0010] In some embodiments, the powder conveying device includes a powder silo, a metering feeder, and a powder conveying pipe. The metering feeder is connected to the bottom of the powder silo, and one end of the powder conveying pipe is connected to the metering feeder, while the other end is sealed to the filter assembly of the spray gun.

[0011] In some embodiments, the gas supply device includes a gas storage tank, a switch valve, and a gas delivery pipeline. The switch valve is installed at the gas outlet of the gas storage tank. One end of the gas delivery pipeline is connected to the switch valve, and the other end is sealed to the gas source purifier of the spray gun through a sealing joint.

[0012] In some embodiments, the movable support includes a base, an angle adjustment member, and a telescopic member. The base is fixedly connected to the sealed chamber, the two sides of the angle adjustment member are rotatably connected to the base, the telescopic member is fixedly installed on the angle adjustment member, and the spray gun is installed at the telescopic end of the telescopic member.

[0013] In some embodiments, the material mounting base includes a placement platform, a slide rail, and a rotary lift. The slide rail is located at the bottom of the sealed chamber, and both ends of the rotary lift are slidably connected to the slide rail. A sliding hole is provided at the bottom of the sealed chamber, and the drive end of the rotary lift passes through the sliding hole and is connected to the placement platform. The placement platform is opposite to the spray gun, and a sealing treatment is provided at the sliding hole.

[0014] In some embodiments, an observation window is provided on one side of the sealed chamber, and an air inlet and an exhaust outlet are provided on the side wall of the sealed chamber. The air inlet is used to pass through an air supply pipe, the exhaust outlet is connected to an exhaust gas treatment device, and a powder recovery device is provided at the bottom of the sealed chamber for recovering unattached sprayed powder.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The spray gun provided by this invention effectively removes impurities from powder and air source through the dual purification effect of filter components and air source purifier, eliminating powder channel blockage and component corrosion problems, and significantly extending the service life of spray gun and equipment; with the help of the circulating cooling function of cooling structure, the working temperature of spray gun is effectively controlled, avoiding powder melting and adhesion and nozzle aging, and ensuring long-term stable operation of equipment.

[0016] This invention also provides a cold spraying device, which achieves stable and uniform powder delivery through precise control of the powder feeder and sealed connection of the powder delivery pipeline, reducing powder leakage and waste, and improving the uniformity and adhesion of the coating thickness. Utilizing the flexible adjustment function of the movable support and material mounting base, the device allows for multi-angle adjustment of the spray gun position, angle, and workpiece positioning, broadening its adaptability and meeting the spraying needs of workpieces of different specifications. Through the isolation of the sealed chamber, exhaust gas treatment, and powder recovery device, the device effectively controls powder splashing and operating noise, ensuring operational safety, reducing environmental pollution, and simultaneously enabling powder recycling and reuse, thus reducing raw material costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the spray gun of the present invention; Figure 2 This is a cross-sectional structural diagram of the spray gun of the present invention; Figure 3 This is a schematic diagram of the cold spraying equipment of the present invention; Figure 4 This is a schematic diagram of the structure of the movable support of the present invention; Figure 5 This is a schematic diagram of the material mounting base of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 100, spray gun body; 110, nozzle; 120, powder channel; 130, powder inlet; 140, high-temperature resistant sealing gasket; 200, filter assembly; 210, filter housing; 220, filter element; 230, sealing cover; 240, feed inlet; 300, air purifier; 400, cooling structure; 410, cooling channel; 420, water inlet pipe; 430, water outlet pipe; 440, heat sink; 500, powder conveyor. 510. Powder silo; 520. Powder conveying pipeline; 600. Gas supply device; 610. Gas storage tank; 620. Switch valve; 630. Gas transmission pipeline; 700. Movable support; 710. Base; 720. Angle adjustment component; 730. Telescopic component; 800. Material mounting seat; 810. Placement platform; 820. Slide rail; 830. Rotary lift; 900. Sealed chamber; 910. Sliding hole; 920. Observation window. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problems of rapid nozzle wear and short overall service life in existing cold spraying equipment, this invention provides a spray gun and a cold spraying device equipped with the spray gun. This invention enables precise control of the spray gun's operating temperature, eliminates problems such as powder channel blockage, component corrosion, and powder melting and adhesion, significantly extends the service life of the spray gun and equipment, and ensures long-term stable operation of the equipment.

[0021] It should be noted that the cold spraying device described in this invention is used for, but is not limited to, cold spraying process equipment for aerospace component repair, oil pipeline corrosion protection, and automotive mold surface strengthening. For ease of explanation, this invention only uses the application of the cold spraying device in high-performance cold spraying equipment as an example for illustration. The principle of the cold spraying device applied to other types of industrial spraying equipment is essentially the same as that applied to this equipment, and will not be elaborated here.

[0022] Please see Figures 1 to 2A spray gun includes a spray gun body 100, a nozzle 110, a powder channel 120, a filter assembly 200, an air source purifier 300, and a cooling structure 400. When the spray gun is in operation, the high-pressure air source required for cold spraying first enters the air source purifier 300, which performs deep purification treatment on the air source, effectively removing oil, moisture, and fine dust, ensuring that the input air source meets the cleanliness standard of "water-free, oil-free, and dust-free," and preventing oil, water, and impurities from entering subsequent channels and causing blockages or component corrosion. Simultaneously, the cold spraying powder enters the equipment through the powder inlet 130, first passing through the filter assembly 200 installed at the powder inlet 130 for graded filtration, intercepting large particles and agglomerated powder clumps in the powder, preventing them from entering the powder channel 120 and clogging the channel. The clean powder filtered through the abraded nozzle 110 enters the powder channel 120 inside the spray gun body 100. There, it mixes thoroughly with the high-pressure air purified by the air purifier 300, forming a stable air-powder mixture. This mixture is then transported along the powder channel 120 to the nozzle 110 connected to one end of the spray gun body 100. After atomization and acceleration by the nozzle 110, the mixture is sprayed out, completing the cold spraying operation. During this process, the cooling structure 400, integrated into one end of the spray gun body 100 and in contact with the powder channel 120, continuously operates to efficiently cool the powder channel 120 and the spray gun body 100. This prevents the spray gun from overheating due to prolonged continuous operation, avoids powder melting and adhesion within the channel, and prevents the nozzle 110 from aging and being damaged due to high temperatures, ensuring long-term stable operation of the spray gun. The spray gun structure in this embodiment utilizes the dual purification functions of the filter assembly 200 and the air source purifier 300 to prevent impurities from clogging and component corrosion at the source, effectively extending the service life of the spray gun. Simultaneously, it ensures the uniformity of air-powder mixing, improving the quality of cold spraying. The cooling structure 400 further reduces the operating temperature of the spray gun, minimizing wear and tear on components and enhancing its operational stability and service life. All components are integrated onto the spray gun body 100, resulting in a compact structure and convenient installation. The sealed connection design between the powder channel 120 and each component prevents air-powder leakage, ensuring operational safety and reducing powder waste. The overall structural design is reasonable, adaptable to the actual needs of cold spraying processes, and highly practical.

[0023] In this embodiment, please refer to Figure 2The nozzle 110 is a Laval nozzle, which utilizes the unique contraction-expansion structure of the Laval nozzle to accelerate the air-powder mixture in the contraction section and stabilize the pressure in the throat, and then further accelerate it in the expansion section, finally spraying it out in the high-speed airflow state required by the cold spraying process. This achieves powder atomization and high-speed deposition, ensuring the formation effect of the cold spray coating. At the same time, the nozzle 110 and the spray gun body 100 are connected by a threaded seal, and with the high-temperature resistant sealing gasket 140 set at the connection, the nozzle 110 can be quickly disassembled and replaced, making it easy to change to a suitable nozzle according to different cold spraying process requirements and powder particle size, improving the versatility of the spray gun. On the other hand, it can effectively enhance the sealing performance of the connection, prevent the high-pressure air-powder mixture from leaking from the connection, avoid affecting the spraying accuracy and operational safety, and the high-temperature resistant sealing gasket 140 can adapt to the high-temperature environment when the spray gun is working, avoiding the aging and failure of the seal due to high temperature, and ensuring the long-term stability of the sealing effect.

[0024] In this embodiment, please refer to Figure 2 The filter assembly 200 includes a filter housing 210, a filter element 220, and a sealing cover 230. The bottom of the filter housing 210 is sealed to the powder inlet 130. The filter element 220 is installed inside the filter housing 210. The sealing cover 230 is sealed to the upper end of the filter housing 210 and has a feed inlet 240. During cold spraying, the cold spray powder enters the filter housing 210 through the feed inlet 240 on the sealing cover 230. The filter element 220 installed inside the filter housing 210 filters the powder. The filter element 220 is a multi-stage filter element, which can effectively intercept large particulate impurities mixed in the powder. The powder agglomerates prevent impurities from entering the powder channel 120 and causing blockage, while also preventing impurities from abrading the inner wall of the powder channel 120 and the nozzle 110. The filtered clean powder enters the powder channel 120 through the sealed connection between the bottom of the filter housing 210 and the powder inlet 130, and mixes with the purified high-pressure air source to form an air-powder mixture. The sealed connection between the filter housing 210 and the powder inlet 130, and the sealed connection between the sealing cover 230 and the filter housing 210, can effectively prevent powder leakage during the filtration process, avoid powder waste and pollution of the working environment. The sealing cover 230 is designed to facilitate periodic disassembly, thereby cleaning or replacing the filter element 220 and ensuring the long-term filtration effect of the filter assembly 200.

[0025] In this embodiment, please refer to Figure 2The cooling structure 400 includes a cooling channel 410, an inlet pipe 420, an outlet pipe 430, and heat sinks 440. The cooling channel 410 is located outside the powder channel 120. One end of the inlet pipe 420 is connected to an external cold water supply device, and the other end is connected to the top of the cooling channel 410. One end of the outlet pipe 430 is connected to the bottom of the cooling channel 410, and the other end is connected to the cold water supply device, forming a circulating cooling loop. The heat sinks 440 are evenly distributed outside the cooling channel 410. During the operation of the spray gun, heat is generated in the powder channel 120 due to the flow and friction of the high-pressure air-powder mixture. At the same time, external operating conditions also cause the temperature of the spray gun body 100 and the powder channel 120 to rise. At this time, the cooling structure 400 is activated, and the external cold water supply device delivers cold water to the powder channel 120 through the inlet pipe 420. Inside the cooling channel 410 outside the powder channel 120, cold water fully absorbs the heat transferred from the powder channel 120, thereby cooling the powder channel 120 and the spray gun body 100. The warm water after absorbing heat flows back to the cold water supply equipment through the water outlet pipe 430, forming a closed-loop cooling circuit. This continuously achieves efficient cooling, effectively preventing the powder from melting and adhering due to excessively high temperatures inside the powder channel 120, and causing wear on the inner wall of the channel. It also prevents the spray gun body 100 and nozzle 110 from being damaged due to high-temperature aging, significantly improving the working stability and service life of the spray gun. At the same time, the heat sinks 440 evenly distributed outside the cooling channel 410 can accelerate the dissipation of heat from the cold water inside the cooling channel 410, further improving cooling efficiency. The overall structure is adapted to the high-temperature working conditions of cold spraying and works in conjunction with other components of the spray gun to ensure the continuous and stable operation of cold spraying.

[0026] A cold spraying device specifically includes a spray gun as described in any one of the above-mentioned embodiments, a powder conveying device 500, a gas supply device 600, a movable support 700, a material mounting base 800, and a sealed chamber 900. The powder conveying device 500 is connected to the inlet 240 of the filter assembly 200 of the spray gun; the gas supply device 600 is sealed to the gas purifier 300 of the spray gun; the spray gun is detachably fixed to the movable support 700; and the material mounting base 800 is disposed on one side of the movable support 700 and used to fix the workpiece to be sprayed. The sealing chamber 900 is used to house the spray gun and the movable support 700. The material mounting base 800 is connected to one end of the sealing chamber 900, with one end positioned in the spray direction of the spray gun. When the cold spraying equipment is working, the workpiece to be sprayed is first fixed on the material mounting base 800, ensuring that the surface to be sprayed is directly facing the spray direction of the spray gun. Then, the spray gun is fixed on the movable support 700. The height, angle, and distance from the workpiece are adjusted using the movable support 700 to accommodate spraying requirements of different sizes and positions. After starting the equipment, the gas supply device 600 supplies gas to the spray gun. The air purifier 300 supplies high-pressure gas, which, after being deeply purified by the air purifier 300 to remove oil, moisture, and impurities, enters the powder channel 120 of the spray gun. Simultaneously, the powder conveying device 500 quantitatively supplies cold spray powder to the inlet 240 of the filter assembly 200 of the spray gun. After the powder is filtered by the filter assembly 200 to remove large particles and agglomerates, it enters the powder channel 120 and mixes thoroughly with the purified high-pressure gas to form a stable gas-powder mixture. This mixture is then accelerated by the Laval nozzle of the spray gun and directed onto the material mounting base 800. The fixed workpiece to be coated is sprayed to complete the deposition of the cold spray coating. During this process, the cooling structure 400 of the spray gun works continuously to circulate and cool the powder channel 120 and the spray gun body 100, ensuring the stable operation of the spray gun. The spray gun and the moving bracket 700 are both set in the sealed chamber 900, which can effectively isolate the powder splash and operation noise generated during the cold spray process, avoiding environmental pollution and personnel injury. The material mounting seat 800 is connected to one end of the sealed chamber 900 and faces the spray direction of the spray gun to ensure the spraying accuracy, while facilitating the picking, placing and positioning of the workpiece.The benefits of this cold spraying equipment are significant: through the coordinated operation of various components, automated and precise cold spraying is achieved. The movable support 700 allows for flexible adjustment of the spray gun position to adapt to the spraying needs of different workpieces, and the detachable and fixed design of the spray gun facilitates maintenance and replacement. The material mounting base 800 can stably fix the workpiece to be sprayed, ensuring accurate spraying position and improving coating uniformity. The sealed chamber 900 balances operational safety and environmental friendliness, avoiding powder waste and noise pollution. The powder conveying device 500 and the gas supply device 600 provide stable powder and clean gas sources for the spray gun, respectively. Combined with the spray gun's own filtration, purification, and cooling structure, this further ensures spraying quality and equipment lifespan. The overall structure is reasonably designed, compactly laid out, and easy to operate, adaptable to various cold spraying operation scenarios, and highly practical and versatile.

[0027] In this embodiment, please refer to Figure 3The powder conveying device 500 includes a powder hopper 510, a metering feeder, and a powder conveying pipe 520. The metering feeder is connected to the bottom of the powder hopper 510. One end of the powder conveying pipe 520 is connected to the metering feeder, and the other end is sealed to the filter assembly 200 of the spray gun. When the cold spraying equipment is in operation, the powder required for cold spraying is pre-filled in the powder hopper 510. Under its own gravity, the powder flows smoothly into the metering feeder connected to the bottom of the powder hopper 510. The metering feeder precisely controls the output rate and conveying volume of the powder according to the preset cold spraying process parameters to ensure that the powder is conveyed to the spray gun. The powder quantity is stable and uniform, avoiding uneven coating thickness and insufficient coating adhesion caused by fluctuations in powder quantity, while also reducing powder waste. The clean powder output by the quantitative powder feeder is transported through the powder feeding pipe 520. Since the other end of the powder feeding pipe 520 is sealed and connected to the filter component 200 of the spray gun, it can effectively prevent powder leakage during the transportation process, avoid environmental pollution and raw material loss caused by powder scattering, and ensure that all powder can enter the filter component 200. After filtering to remove large particles and agglomerates, it enters the powder channel 120 of the spray gun and mixes with the purified high-pressure air source, ensuring the uniformity and cleanliness of the air-powder mixture. The powder conveying device 500 offers significant advantages: the powder hopper 510 can store sufficient powder to meet the continuous operation requirements of cold spraying; the bottom connection with the quantitative powder feeder avoids powder bridging and clogging, ensuring smooth material feeding; the precise control function of the quantitative powder feeder achieves standardization and automation of powder conveying, effectively improving the stability and consistency of cold spray coating quality; the sealed connection between the powder conveying pipe 520 and the filter assembly 200 balances operational sealing and raw material utilization, while working in conjunction with the spray gun filter assembly 200 to further ensure the purity of the powder entering the powder channel 120, reducing the impact of impurities on the spraying effect and spray gun components from the source. The overall structure is reasonably designed, easy to operate, and adaptable to the continuous and stable operation requirements of cold spraying equipment, making it highly practical.

[0028] In this embodiment, please refer to Figure 3The gas supply device 600 includes a gas storage tank 610, a switching valve 620, and a gas delivery pipeline 630. The switching valve 620 is installed at the gas outlet of the gas storage tank 610. One end of the gas delivery pipeline 630 is connected to the switching valve 620, and the other end is sealed to the air source purifier 300 of the spray gun through a sealing joint. Its working principle and beneficial effects are as follows: During cold spraying, the high-pressure gas pre-stored in the gas storage tank 610 serves as the power source for cold spraying. When the equipment is started, the switching valve 620 installed at the gas outlet of the gas storage tank 610 is opened, and the high-pressure gas is delivered to the air source purifier 300 of the spray gun through the gas delivery pipeline 630. The air source purifier 300 deeply purifies the gas, removing oil, moisture, and minute impurities, before it enters the powder channel 120 to mix with the powder. The gas storage tank 610 can stably store high-pressure gas, ensuring the continuous and stable gas source pressure and avoiding the impact of gas source pressure fluctuations on the spraying effect; the switch valve 620 is set to facilitate the quick start and stop of the gas source supply, realizing precise control of the equipment; the gas pipeline 630 and the gas source purifier 300 are sealed together by a sealing joint, ensuring the airtightness during the high-pressure gas transportation process, preventing gas leakage from causing safety hazards or energy waste, and at the same time, in coordination with the spray gun gas source purification mechanism, it further improves the cleanliness of the gas source entering the powder channel, avoiding impurities from contaminating the powder or damaging the internal components of the spray gun.

[0029] In this embodiment, please refer to Figure 4 The movable support 700 includes a base 710, an angle adjusting component 720, and a telescopic component 730. The base 710 is fixedly connected to the sealing chamber 900. The two sides of the angle adjusting component 720 are rotatably connected to the base 710. The telescopic component 730 is fixedly installed on the angle adjusting component 720, and the spray gun is installed on the telescopic end of the telescopic component 730. During the installation and debugging of the spraying equipment, the spray gun can be detachably fixed to the telescopic end of the telescopic component 730 of the movable support 700. By cooperating with the angle adjusting component 720, the spray angle of the spray gun can be rotated and adjusted to adapt to the spraying requirements of workpieces at different angles and positions. At the same time, the telescopic component 730 installed on the angle adjusting component 720 can move along the telescopic direction to precisely adjust the distance between the spray gun and the workpiece to be sprayed, meeting the spraying distance requirements of different spraying processes and ensuring high-speed powder deposition.

[0030] In this embodiment, please refer to Figure 4 , Figure 5The material mounting base 800 includes a placement platform 810, a slide rail 820, and a rotary lift 830. The slide rail 820 is located at the bottom of the sealing chamber 900. Both ends of the rotary lift 830 are slidably connected to the slide rail 820. A sliding hole 910 is provided at the bottom of the sealing chamber 900. The drive end of the rotary lift 830 passes through the sliding hole 910 and is connected to the placement platform 810. The placement platform 810 is opposite to the spray gun, and a sealing treatment is provided at the sliding hole 910. During cold spraying, the workpiece to be sprayed is placed on the placement platform 810, which is opposite to the spraying direction of the spray gun. The placement platform 810 can be raised and lowered by the rotating lift 830 connected to the bottom. The height of the placement platform 810 is adjusted according to the height of the workpiece to ensure that the spraying area of ​​the workpiece is aligned with the spraying center of the spray gun. At the same time, the two ends of the rotating lift 830 slide along the slide rail 820 at the bottom of the sealing chamber 900, which can drive the placement platform 810 and the workpiece to move horizontally, so as to achieve precise positioning of the workpiece spraying position and complete the spraying operation of different areas. The material mounting base 800 offers significant advantages: the relative arrangement of the placement platform 810 and the spray gun ensures the accuracy of the spray direction and improves spraying precision; the lifting function of the rotary lift 830, combined with the sliding function of the slide rail 820, enables multi-dimensional adjustment of the workpiece position, adapting to the fixing and spraying needs of workpieces of different sizes and shapes; the sealing treatment at the sliding hole 910 effectively prevents powder exhaust gas in the sealing chamber 900 from leaking through the hole, ensuring the overall sealing performance of the sealing chamber 900 and avoiding operational pollution; at the same time, the stable drive of the rotary lift 830 ensures accurate workpiece positioning and reliable operation.

[0031] In this embodiment, please refer to Figure 3 An observation window 920 is provided on one side of the sealed chamber 900, and an air inlet and an exhaust outlet are provided on the side wall of the sealed chamber 900. The air inlet is used to pass through the air supply pipe 630, and the exhaust outlet is connected to the waste gas treatment device. A powder recovery device is provided at the bottom of the sealed chamber 900 for recovering unattached sprayed powder. During cold spraying, both the spray gun and the workpiece are inside the sealed chamber 900. The observation window 920 on one side of the sealed chamber 900 is made of explosion-proof transparent material, allowing staff to observe the spraying progress, workpiece status, and equipment operation in real time, enabling timely detection and handling of abnormalities. The air inlet on the side wall of the sealed chamber 900 provides a passage for the air supply pipe 630, ensuring a sealed connection between the gas supply device 600 and the spray gun air source purifier 300. The exhaust port is connected to a waste gas treatment device that can purify the powder-containing waste gas generated during the spraying process, removing powder particles and harmful substances from the waste gas before it is discharged, thus avoiding environmental pollution. The powder recovery device at the bottom of the sealed chamber 900 can efficiently collect the loose powder that does not adhere to the workpiece during the spraying process, realizing the recycling and reuse of powder and reducing raw material costs.

[0032] To better understand this invention, the following is combined with... Figures 1 to 5 The technical solution of the present invention is described in detail below: The spray gun and cold spraying equipment provided by the present invention, through the coordinated cooperation of the spray gun body 100, powder channel 120, Laval nozzle 110, filter assembly 200, air source purifier 300 and cooling device 400, combined with the integrated layout of powder conveying device 500, gas supply device 600, moving support 700, material mounting base 800 and sealing chamber 900, realizes efficient, precise and safe operation of cold spraying. First, the powder is precisely controlled by a metering feeder in the powder hopper 510 of the powder conveying device 500, and then conveyed to the filter assembly 200 of the spray gun through the powder conveying pipe 520 to intercept large particles of impurities. At the same time, the high-pressure gas from the gas supply device 600 enters the gas source purifier 300 through the gas delivery pipe 630 to remove impurities such as oil, water, and dust. The purified clean gas and the filtered pure powder are fully mixed in the powder channel 120 to form a stable gas-powder mixture. After being accelerated at high speed by the contraction-expansion structure of the Laval nozzle 110, it is sprayed onto the workpiece to be coated, which is fixed on the material mounting base 800. During this process, the cooling structure 400 uses circulating cold water to efficiently absorb heat from the channel through the cooling channel 410 and heat sink 440 surrounding the powder channel 120, ensuring that the spray gun operates at a stable low temperature and avoiding high-temperature wear and powder adhesion. The movable support 700 located in the sealed chamber 900 can flexibly adjust the position and angle of the spray gun, the material mounting seat 800 enables precise positioning and multi-dimensional adjustment of the workpiece, and the sealed chamber 900 effectively isolates powder splash and noise, and ensures environmental protection and resource recycling through exhaust gas treatment and powder recycling devices.

[0033] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A spray gun characterized in that, include: The spray gun itself; The nozzle is connected to one end of the spray gun body; A powder channel is provided inside the spray gun body, one end of the powder channel is connected to the nozzle, and the other end is provided with a powder inlet; A filter assembly is installed at the powder inlet; An air purifier is installed at one end of the spray gun body and is sealed and connected to the powder channel; as well as The cooling structure is integrated inside the spray gun body and fits into the powder channel.

2. The lance of claim 1, wherein The nozzle is a Laval nozzle and is threadedly sealed to the spray gun body, with a high-temperature resistant sealing gasket at the connection.

3. The lance of claim 1, wherein The filter assembly includes a filter housing, a filter element, and a sealing cap. The bottom of the filter housing is sealed to the powder inlet. The filter element is installed inside the filter housing. The sealing cap is sealed to the upper end of the filter housing and has a feed inlet.

4. The lance of claim 1, wherein The cooling device includes a cooling channel, an inlet pipe, an outlet pipe, and heat sinks. The cooling channel is located outside the powder channel. One end of the inlet pipe is connected to an external cold water supply device, and the other end is connected to the top of the cooling channel. One end of the outlet pipe is connected to the bottom of the cooling channel, and the other end is connected to the cold water supply device, forming a circulating cooling loop. The heat sinks are evenly distributed outside the cooling channel.

5. A cold spray apparatus characterized by, include: The spray gun as described in any one of claims 1-4; A powder conveying device is connected to the feed inlet of the filter assembly of the spray gun; A gas supply device is sealed and connected to the gas purifier of the spray gun; A movable support, on which the spray gun can be detachably fixed; A material mounting base is provided on one side of the movable bracket and is used to fix the workpiece to be sprayed; as well as A sealed chamber is provided, in which the spray gun and the movable bracket are disposed. The material mounting base is connected to one end of the sealed chamber, and one end of the material mounting base is disposed in the spraying direction of the spray gun.

6. The cold spraying equipment according to claim 5, characterized in that, The powder conveying device includes a powder silo, a quantitative powder feeder, and a powder conveying pipe. The quantitative powder feeder is connected to the bottom of the powder silo, and one end of the powder conveying pipe is connected to the quantitative powder feeder, while the other end is sealed to the filter assembly of the spray gun.

7. The cold spraying equipment according to claim 5, characterized in that, The gas supply device includes a gas storage tank, a switch valve, and a gas pipeline. The switch valve is installed at the gas outlet of the gas storage tank. One end of the gas pipeline is connected to the switch valve, and the other end is sealed to the gas source purifier of the spray gun through a sealing joint.

8. The cold spraying equipment according to claim 5, characterized in that, The movable support includes a base, an angle adjustment component, and a telescopic component. The base is fixedly connected to the sealed chamber. The two sides of the angle adjustment component are rotatably connected to the base. The telescopic component is fixedly installed on the angle adjustment component. The spray gun is installed at the telescopic end of the telescopic component.

9. The cold spraying equipment according to claim 5, characterized in that, The material mounting base includes a placement platform, a slide rail, and a rotary lift. The slide rail is located at the bottom of the sealed chamber. Both ends of the rotary lift are slidably connected to the slide rail. A sliding hole is provided at the bottom of the sealed chamber. The drive end of the rotary lift passes through the sliding hole and is connected to the placement platform. The placement platform is opposite to the spray gun, and a sealing treatment is provided at the sliding hole.

10. The cold spraying equipment according to claim 7, characterized in that, An observation window is provided on one side of the sealed chamber, and an air inlet and an exhaust outlet are provided on the side wall of the sealed chamber. The air inlet is used to pass through an air supply pipe, and the exhaust outlet is connected to a waste gas treatment device. A powder recovery device is provided at the bottom of the sealed chamber to recover unattached sprayed powder.

Images