Lightweight variable-diameter explosion spraying gun

Abstract

The invention relates to the technical field of explosion spraying, in particular to a lightweight variable-diameter explosion spraying gun. Comprising a variable-diameter gun barrel, a lightweight gun barrel shell and a combustion chamber, by means of the Laval nozzle structure which contracts and then expands, the sectional area of a flowing channel of gas and particles is changed, the acceleration and convergence process of the gas and the particles is optimized, and therefore the coating performance is effectively improved. High-temperature and high-pressure gas generated by explosion can be more sufficiently mixed by the combustion chamber with the rotating structure; the variable-diameter structure reduces loss of energy in the gun barrel in the transmission process, gas energy is more efficiently transmitted to spraying particles, the speed of the particles is increased, the temperature of the particles is increased, and then the bonding strength of a coating and a base body and the quality of the coating are improved. The variable-diameter design is beneficial to reducing fluctuation generated by detonation waves, the uniformity and consistency of the coating are guaranteed, and the stability and reliability of spraying operation are improved. Due to the light-weight design of the gun barrel shell, the whole spray gun is lighter and more convenient for operators to disassemble and replace, and the efficiency of spraying operation is improved.

Description

Technical Field

[0001] This invention relates to the field of explosive spraying technology, specifically to a lightweight variable diameter explosive spraying gun. It can effectively optimize the dynamic characteristics of gas and particles during the spraying process, and is suitable for preparing high-performance explosive spray coatings on the surface of parts. Background Technology

[0002] Currently, explosive spraying technology is widely used in the field of material surface treatment, but traditional explosive spraying guns have many shortcomings. On the one hand, researchers usually hope to improve coating quality by increasing the particle spraying speed. However, the internal channel diameter of traditional spray guns is fixed, and the particle speed is determined only by changing the time when oxygen and combustion gases enter the spray gun. This makes it impossible to flexibly adjust the flow state of gas and particles in the spray gun barrel, resulting in difficulty in achieving optimal acceleration and heating effects. On the other hand, the fixed diameter spray gun structure causes significant energy dissipation during the transmission of high-temperature and high-pressure gas generated by the explosion, which cannot fully transfer energy to the sprayed particles, resulting in unsatisfactory particle speed and temperature, ultimately affecting the bonding strength and surface quality of the coating. In addition, the existing spray gun barrel shell is usually made of stainless steel, making the overall weight of the spray gun large and difficult to disassemble. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art, such as low particle velocity in explosive spraying resulting in high coating porosity and low bonding strength, as well as the problem of the relatively heavy spray gun.

[0004] This provides a lightweight variable diameter explosive spray gun, comprising: a variable diameter barrel, a lightweight barrel shell, and a combustion chamber; the lightweight barrel shell is fitted over the variable diameter barrel, and the variable diameter barrel is a two-section hollow tube with an internal cavity for containing explosive gases and spray powder. One section is a tapered tail section 6, one end of which is inserted into the inner wall of the combustion chamber, and the other end is a feed end connected to a feed rack 4, which is inserted into the lightweight barrel shell; the other section is an expanding muzzle section 3, one end of which is a feed end connected to the feed rack 4, and the other end is a muzzle end that opens to the atmosphere.

[0005] The variable diameter barrel is made of one of the following materials: aluminum, aluminum alloy, brass, or copper.

[0006] The diameter of the tapered gun tail section is 400mm to 800mm, and the diameter decreases linearly from the combustion chamber end to the feed rack end. The diameter of the combustion chamber end is 20mm to 30mm, and the diameter of the feed end is 15mm to 20mm. The ratio of the diameter of the combustion chamber end to the diameter of the feed end is 1.2 to 2:1.

[0007] The diameter of the expanding muzzle section is 300mm to 500mm, and the diameter from the feed rack end to the muzzle end expands linearly. The diameter of the feed rack end is 15mm to 20mm, and the diameter of the muzzle end is 20mm to 30mm. The ratio of the diameter of the feed end to the diameter of the muzzle end is 0.5 to 0.8:1.

[0008] The lightweight barrel includes a tail section housing 5, a muzzle section housing 2, a water pipe connector, and a sealing ring. The tail section housing 5 is fitted over the tapered tail section, and the muzzle section housing 2 is fitted over the expanding muzzle section. The muzzle is fixed with a nut 1. The muzzle section housing is provided with a water outlet connector 11. The sealing rings, including a muzzle sealing ring 15 and a tail section sealing ring 14, are installed at the connection between the lightweight barrel housing and the variable diameter barrel.

[0009] The inner diameter of the gun tail section shell 5 is 1-2 mm larger than the outer diameter of the tapered gun tail section.

[0010] The inner diameter of the muzzle section outer shell 2 is 1-2 mm larger than the outer diameter of the expanded muzzle section.

[0011] The muzzle and tail sections are made of titanium alloy or aluminum alloy.

[0012] The combustion chamber includes a combustion chamber body 8, a combustion chamber cover 12, a spark plug 9, and a sealing ring. The combustion chamber body 8 is a cavity with a rotating structure on its outer wall. The combustion chamber cover 12 is a groove-shaped structure with a groove for fixing the combustion chamber body 8. It has threaded holes on both sides for connecting to the spark plug 9. At the same time, a water inlet pipe connector 10 is provided in the vertical direction of the spark plug. The sealing ring includes a combustion chamber sealing ring 13 and a combustion chamber cover sealing ring 12.

[0013] The spark plug 9 is a commercially available iridium spark plug with a center electrode diameter of 0.4 mm and a heat value of 16 J / kg.

[0014] The present invention has the following beneficial effects: 1. Increase particle velocity: By using a Laval nozzle structure that contracts first and then expands, the cross-sectional area of ​​the gas and particle flow channels is changed, optimizing the acceleration and convergence process of gas and particles, thereby effectively improving coating performance.

[0015] 2. Optimized energy transfer: The rotating combustion chamber allows for more thorough mixing of the high-temperature, high-pressure gases generated by the explosion; the variable diameter structure reduces energy loss during transmission within the barrel, enabling more efficient transfer of gas energy to the sprayed particles, increasing particle velocity and temperature, and thus enhancing the bonding strength between the coating and the substrate and the coating quality.

[0016] 3. Stable spraying process: The variable diameter design helps reduce the fluctuations caused by detonation waves, ensuring the uniformity and consistency of the coating, and improving the stability and reliability of the spraying operation.

[0017] 4. Reduced spray gun weight: The lightweight design of the barrel shell makes the spray gun lighter overall, making it easier for operators to disassemble and replace, and improving the efficiency of spraying operations. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the lightweight variable diameter explosive spray gun provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the lightweight variable diameter explosive spray gun provided in Embodiment 2 of the present invention.

[0020] The microstructure. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments: A lightweight variable-diameter explosive spray gun includes: a variable-diameter barrel, a lightweight barrel shell, and a combustion chamber; the lightweight barrel shell is fitted over the variable-diameter barrel to fix the barrel. The variable-diameter barrel is a two-section hollow tube with an internal cavity for containing explosive gases and spray powder. One section is a tapered tail section 6, one end of which is inserted into the inner wall of the combustion chamber, and the other end is a feed end connected to a feed rack 4, which is inserted into the lightweight barrel shell. The other section is an expanding muzzle section 3, one end of which is a feed end connected to the feed rack 4, and the other end is a muzzle end open to the atmosphere.

[0022] The variable diameter barrel is made of one of the following materials: aluminum, aluminum alloy, brass, or copper.

[0023] The diameter of the tapered gun tail section is 400mm to 800mm, and the diameter decreases linearly from the combustion chamber end to the feed rack end. The diameter of the combustion chamber end is 20mm to 30mm, and the diameter of the feed end is 15mm to 20mm. The ratio of the diameter of the combustion chamber end to the diameter of the feed end is 1.2 to 2:1.

[0024] The diameter of the expanding muzzle section is 300mm to 500mm, and the diameter from the feed rack end to the muzzle end expands linearly. The diameter of the feed rack end is 15mm to 20mm, and the diameter of the muzzle end is 20mm to 30mm. The ratio of the diameter of the feed end to the diameter of the muzzle end is 0.5 to 0.8:1.

[0025] The lightweight gun barrel includes a tail section outer shell 5, a muzzle section outer shell 2, a water pipe connector, and a sealing ring. The tail section outer shell 5 is fitted over the tapered tail section, and the muzzle section outer shell 2 is fitted over the expanding muzzle section. The muzzle is secured with a nut 1. The muzzle section outer shell has a water outlet connector 11 for circulating cooling water between the variable diameter gun barrel and the lightweight gun barrel to prevent overheating during spraying and ensure the spray gun maintains a suitable temperature during prolonged operation. The sealing rings, including a muzzle sealing ring 15 and a tail section sealing ring 14, are installed at the connection between the lightweight gun barrel outer shell and the variable diameter gun barrel to prevent leakage of cooling water and gas.

[0026] The inner diameter of the gun tail section shell 5 is 1-2 mm larger than the outer diameter of the tapered gun tail section.

[0027] The inner diameter of the muzzle section outer shell 2 is 1-2 mm larger than the outer diameter of the expanded muzzle section.

[0028] The muzzle and tail sections are made of titanium alloy or aluminum alloy.

[0029] The combustion chamber includes a combustion chamber body 8, a combustion chamber cover 12, a spark plug 9, and a sealing ring. The combustion chamber body 8 is a cavity with a rotating structure on its outer wall, which fits tightly against the inner wall of the combustion chamber cover. When explosive spraying gases such as oxygen, nitrogen, and fuel gas enter the combustion chamber, they can achieve a spiral flow, thereby achieving full collection and mixing of the gases. The combustion chamber cover 12 is a grooved structure used to fix the combustion chamber body 8 and to allow the explosive spraying gases to enter the combustion chamber from the rear. It has threaded holes on both sides, which are connected to the spark plug 9. At the same time, a water inlet connector 10 is provided in the vertical direction of the spark plug for introducing circulating cooling water to prevent overheating of the gun barrel during spraying. The sealing rings include a combustion chamber sealing ring 13 and a combustion chamber cover sealing ring 12, which serve to prevent leakage of cooling water and gases.

[0030] The spark plug 9 is a commercially available iridium spark plug with a center electrode diameter of 0.4 mm and a heat value of 16. It is used to receive high-voltage current and achieve explosive spray ignition.

[0031] Example 1 Spray gun diagram as shown Figure 1As shown, the variable-diameter barrel is a two-section hollow tube. One section is a tapering breech section, with one end being the combustion chamber end, inserted into the inner wall of the combustion chamber, and the other end being the feed end, connected to the feed rack, and externally inserted into the barrel shell. The other section is an expanding muzzle section, with one end being the feed end, connected to the feed rack, and the other end being the muzzle end, opening to the atmosphere. The variable-diameter barrel is made of aluminum alloy. The tapering breech section is 600mm long, with its diameter linearly decreasing from the combustion chamber end to the feed rack end. The diameter of the combustion chamber end is 25mm, and the diameter of the feed end is 20mm, with a ratio of 1.25:1. The expanding muzzle section is 400mm long, with its diameter linearly expanding from the feed rack end to the muzzle end. The diameter of the feed rack end is 20mm, and the diameter of the muzzle end is 25mm, with a ratio of 0.8:1.

[0032] A lightweight barrel housing is fitted over the variable-diameter barrel. A breech housing, with an inner diameter of 27mm, is fitted over the tapered breech section. A muzzle housing, with an inner diameter of 27mm, is fitted over the expanding muzzle section and secured with a nut at the muzzle. Both the breech and muzzle housings are made of titanium alloy. The muzzle housing has a water outlet connector. A muzzle sealing ring and a breech sealing ring are connected at the junction of the lightweight barrel housing and the variable-diameter barrel.

[0033] The combustion chamber body is a cavity with a rotating structure on its outer wall, which fits tightly against the inner wall of the combustion chamber cover. The combustion chamber cover has a grooved structure with threaded holes on both sides for connection to the spark plug, and also includes a water inlet connector. The spark plug is a standard commercially available iridium spark plug with a center electrode diameter of 0.4 mm and a heat range of 16. Sealing rings include a combustion chamber sealing ring and a combustion chamber cover sealing ring.

[0034] Example 2 Spray gun diagram as shown Figure 2 As shown. The variable-diameter barrel is a two-section hollow tube. One section is a tapering breech section, with one end being the combustion chamber end, inserted into the inner wall of the combustion chamber, and the other end being the feed end, connected to the feed rack, and externally inserted into the barrel shell. The other section is an expanding muzzle section, with one end being the feed end, connected to the feed rack, and the other end being the muzzle end, opening to the atmosphere. The variable-diameter barrel is made of aluminum alloy. The tapering breech section is 500mm long, with its diameter linearly decreasing from the combustion chamber end to the feed rack end. The diameter of the combustion chamber end is 30mm, and the diameter of the feed end is 15mm, with a ratio of 2:1. The expanding muzzle section is 300mm long, with its diameter linearly expanding from the feed rack end to the muzzle end. The diameter of the feed rack end is 15mm, and the diameter of the muzzle end is 25mm, with a ratio of 0.6:1.

[0035] A lightweight barrel housing is fitted over the variable-diameter barrel. A breech housing, with an inner diameter of 32mm, is fitted over the tapered breech section. A muzzle housing, with an inner diameter of 27mm, is fitted over the expanding muzzle section and secured with a nut at the muzzle. Both the breech and muzzle housings are made of aluminum alloy. The muzzle housing has a water outlet connector. A muzzle sealing ring and a breech sealing ring are connected at the junction of the lightweight barrel housing and the variable-diameter barrel.

[0036] The combustion chamber body is a cavity with a rotating structure on its outer wall, which fits tightly against the inner wall of the combustion chamber cover. The combustion chamber cover has a grooved structure with threaded holes on both sides for connection to the spark plug, and also includes a water inlet connector. The spark plug is a standard commercially available iridium spark plug with a center electrode diameter of 0.4 mm and a heat range of 16. Sealing rings include a combustion chamber sealing ring and a combustion chamber cover sealing ring.

Claims

1. A lightweight variable diameter thermal spray gun, comprising: The variable diameter barrel includes a variable diameter barrel, a light weight barrel shell, and a combustion chamber. The light weight barrel shell is sleeved outside the variable diameter barrel. The variable diameter barrel is a two-section hollow tubular structure. The internal cavity is used for containing explosive gas and spraying powder. One section is a tapered tail section (6) which is inserted into the inner wall of the combustion chamber at one end and connected with a feeding rack (4) at the other end. The other section is an expanding muzzle section (3) which is connected with the feeding rack (4) at one end and connected with the atmosphere at the other end.

2. The lightweight variable diameter thermal spray gun of claim 1, wherein, The variable diameter barrel is made of one of aluminum, aluminum alloy, brass, and red copper.

3. The lightweight variable diameter thermal spray gun of claim 1, wherein, The diameter of the tapered tail section is 400mm-800mm. The diameter linearly decreases from the combustion chamber end to the feeding rack end. The diameter of the combustion chamber end is 20mm-30mm. The diameter of the feeding end is 15mm-20mm. The ratio of the diameter of the combustion chamber end to the diameter of the feeding end is 1.2-2:

1.

4. The lightweight variable diameter thermal spray gun of claim 1, wherein, The diameter of the expanding muzzle section is 300mm-500mm. The diameter linearly expands from the feeding rack end to the muzzle end. The diameter of the feeding rack end is 15mm-20mm. The diameter of the muzzle end is 20mm-30mm. The ratio of the diameter of the feeding end to the diameter of the muzzle end is 0.5-0.8:

1.

5. The lightweight variable diameter explosive spray gun of claim 1, wherein, The light weight barrel includes a tail section shell (5), a muzzle section shell (2), a water pipe joint, and a sealing ring. The tail section shell (5) is sleeved outside the tapered tail section. The muzzle section shell (2) is sleeved outside the expanding muzzle section. The muzzle is fixed by a nut (1). The muzzle section shell is provided with a water outlet pipe joint (11). The sealing ring includes a muzzle section sealing ring (15) and a tail section sealing ring (14) which are installed at the connection between the light weight barrel shell and the variable diameter barrel.

6. The lightweight variable diameter explosive spray gun of claim 1, wherein, The inner diameter of the tail section shell (5) is 1-2mm larger than the outer diameter of the tapered tail section.

7. The lightweight variable diameter explosive spray gun of claim 1, wherein, The inner diameter of the muzzle section shell (2) is 1-2mm larger than the outer diameter of the expanding muzzle section.

8. The lightweight variable diameter explosive spray gun of claim 1, wherein, The tail section shell and the muzzle section shell are made of titanium alloy or aluminum alloy.

9. The lightweight variable diameter explosive spray gun of claim 1, wherein, The combustion chamber includes a combustion chamber body (8), a combustion chamber cover (12), a spark plug (9), and a sealing ring. The combustion chamber body (8) is a cavity with a rotating structure on the outer wall. The combustion chamber cover (12) is a grooved slot structure for fixing the combustion chamber body (8). The two sides are provided with threaded holes connected with the spark plug (9). The vertical direction of the spark plug is provided with a water inlet pipe joint (10). The sealing ring includes a combustion chamber sealing ring (13) and a combustion chamber cover sealing ring (12).

10. The lightweight variable diameter explosive spray gun of claim 1, wherein, The spark plug (9) is a conventional commercially available iridium spark plug. The center electrode diameter is 0.4mm. The heat value is 16 j / kg.

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