Surface spraying device of ligament stretcher

Abstract

The invention relates to the technical field of medical instrument preparation, in particular to a surface spraying device of a ligament stretcher, and mainly solves the problems that an existing spraying device is poor in surface spraying effect and prone to causing local burning damage. Comprising a rack, a power module, a control system, a gas supply system, a powder feeding system, a heat exchange system, a plasma generation system and a spray gun. The plasma generation system comprises an anode assembly and a cathode assembly, the anode assembly comprises a first anode and a second anode, the first anode and the second anode are each composed of a plurality of sectional type anode units, the anode units are isolated through insulating layers, and the multiple anode units and the insulating layers form an annular structure. The cathode assembly comprises a first cathode and a second cathode. The spray gun comprises a first-stage heating assembly, a second-stage heating assembly, an auxiliary heating assembly, at least three gas guide pipes, a first gas inlet pipe, at least two second gas inlet pipes, two water inlet pipes, two water outlet pipes and a spray head.

Description

Technical Field

[0001] The invention relates to the technical field of medical device preparation, and in particular to a surface spraying device for a ligament stretcher. Background Art

[0002] Ligament stretchers are a type of medical device used for rehabilitation therapy and sports training. Their surface properties directly affect the effect and safety of use. Traditional ligament stretchers are mostly made of metal or polymer materials, and the surface is susceptible to problems such as wear, corrosion, and bacterial growth. Existing surface treatment processes such as electroplating and anodizing can improve surface properties, but they have problems such as complex processes, high costs, and poor environmental protection. Therefore, most plasma spray devices are used for surface spraying, so that the surface of the ligament stretcher is covered with a layer of coating.

[0003] Plasma spraying is a technology that uses plasma to generate a high-temperature and high-speed jet to melt the spray material and accelerate it to the surface of the substrate. However, existing plasma generators usually use a single anode structure, which easily forms uneven current distribution on the anode surface, resulting in local excessive or low plasma density, making the injected spray material unevenly heated, resulting in poor spraying effect, and after long-term use, the anode fails due to local burning and needs to be replaced frequently. Summary of the invention

[0004] Therefore, in view of the above-mentioned problems, the present invention provides a surface spraying device for a ligament stretcher, which mainly solves the problem that the surface spraying effect of the existing spraying device is poor and is prone to cause local burning damage.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A surface spraying device for a ligament stretcher, comprising a frame, a power module, a control system, a gas supply system, a powder delivery system, a heat exchange system, a plasma generation system and a spray gun; The plasma generating system comprises an anode assembly and a cathode assembly, wherein the anode assembly comprises a first anode and a second anode, wherein the first anode and the second anode are both composed of a plurality of segmented anode units, wherein the anode units are isolated by an insulating layer, and the plurality of anode units and the insulating layer form a ring-shaped structure, and the cathode assembly comprises a first cathode and a second cathode; The spray gun includes a primary heating component, a secondary heating component, an auxiliary heating component, at least three air guide pipes, a first air inlet pipe, at least two second air inlet pipes, two water inlet pipes, two water outlet pipes and a nozzle, the primary heating component includes a first shell, the first shell has a first flow channel, the first anode and the first cathode are respectively arranged in the first flow channel, so that the first flow channel forms a first gas flow channel and a first cooling cavity isolated from each other, the first gas flow channel is an annular structure, the first air inlet pipe is connected to the input end of the first gas flow channel, the secondary heating component includes a second shell, the second shell has a second flow channel, the second anode and the second cathode are respectively arranged in the second flow channel, so that the first flow channel forms a first gas flow channel and a first cooling cavity isolated from each other, the first gas flow channel is annular, the first air inlet pipe is connected to the input end of the first gas flow channel, the secondary heating component includes a second shell, the second shell has a second flow channel, the second anode and the second cathode are respectively arranged in the second flow channel, The two flow channels form a second gas flow channel and a second cooling cavity isolated from each other, each of the air guide pipes is connected to the input end of the first gas flow channel and the output end of the second gas flow channel, each of the second air inlet pipes is respectively connected to part of the air guide pipes, the first air inlet pipe and each of the second air inlet pipes are respectively connected to the gas supply system, the two water inlet pipes are respectively connected to the water outlet end of the heat exchange system and the first cooling cavity and the second cooling cavity, the two water outlet pipes are respectively connected to the water inlet end of the heat exchange system and the first cooling cavity and the second cooling cavity, the auxiliary heating component is arranged on the second air inlet pipe, the nozzle is arranged on the second shell, the nozzle has an air jet channel and a powder channel connected to the second gas flow channel, and the powder channel is connected to the powder feeding system; The power module includes a main power supply and multiple sub-power supplies, each of which is connected to each anode unit respectively. The power module, gas supply system, powder delivery system, heat exchange system, and plasma generation system are electrically connected to the control system respectively.

[0006] Furthermore, the gas supply system includes a first gas tank, a second gas tank, a first air pump, a second air pump, a first switch valve, a second switch valve, a first connecting pipe and a second connecting pipe, the first gas tank is connected to the first air intake pipe through the first connecting pipe, the first air pump and the first switch valve are arranged on the first connecting pipe, the second gas tank is connected to the second air intake pipe through the second connecting pipe, and the second air pump and the second switch valve are arranged on the second connecting pipe.

[0007] Furthermore, the first gas tank is filled with argon gas, and the second gas tank is filled with 85% to 95% argon gas and 5% to 15% hydrogen gas.

[0008] Furthermore, the angle between the central axis of the second air inlet pipe and the central axis of the air guide pipe is 30° to 70°.

[0009] Furthermore, the nozzle includes a nozzle body, the jet channel is distributed at the central axis of the nozzle body, the powder channel includes a main powder channel and an auxiliary powder channel, the output end of the main powder channel is connected to the middle of the jet channel, and the auxiliary powder channel connects the middle of the main powder channel and the middle of the jet channel.

[0010] Furthermore, the jet channel includes an air guide portion and a spraying portion, the diameter of the air guide portion gradually decreases from the input end to the output end, the diameter of the input end of the air guide portion is smaller than the diameter of the output end of the spraying portion, the diameter of the spraying portion gradually increases from the input end to the output end, and the ratio of the axial length of the air guide portion to the axial length of the spraying portion is 3 to 6:1.

[0011] Furthermore, the output end of the main powder channel is distributed at the middle of the air guide part, and the output end of the auxiliary powder channel is distributed at the connection between the air guide part and the spraying part.

[0012] Furthermore, the angle between the central axis of the main powder channel and the central axis of the jet channel is 95° to 120°, and the angle between the central axis of the auxiliary powder channel and the central axis of the jet channel is 60° to 90°.

[0013] Furthermore, the first shell includes a first part and a second part arranged at one end of the first part, a first gas flow channel is formed between the first cathode and the first anode, and a first cooling chamber is formed between the first anode and the second part, and the second shell includes a third part and a fourth part arranged at one end of the third part, a second gas flow channel is formed between the second cathode and the second anode, and a second cooling chamber is formed between the second anode and the fourth part.

[0014] Furthermore, the insulating layer is alumina ceramic or polyimide.

[0015] By adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: in the surface spraying device of the ligament stretcher, the gas in the first gas tank enters the first gas flow channel through the first air inlet pipe, and an arc is generated by energizing the first anode and the first cathode, so that the gas forms plasma to generate a high-temperature and high-speed jet, thereby realizing primary heating, and then the high-temperature and high-speed jet is introduced into the second shell through the air duct, and at the same time, the second air inlet pipe is connected to part of the air duct, and an auxiliary heating component is provided on the second air inlet pipe, so that the gas in the second gas tank is preliminarily heated in the second air inlet pipe, and the electromagnetic field generated by the auxiliary heating component can affect the movement direction of particles in the jet, and the gas entering from the second air inlet pipe can be quickly integrated into the airflow in the air duct and realize one-time mixing, and the gas in multiple air ducts enters the second gas flow channel and is mixed again, and an arc is generated by energizing the second anode and the second cathode, so that the gas forms plasma to generate a high-temperature and high-speed jet, thereby realizing Secondary heating is performed to meet the requirements of the temperature and speed of the jet, and then the spray material entering from the nozzle is heated to a molten state by the jet and then sprayed on the surface of the ligament stretcher. Secondary heating in this way can reduce the power of the first anode, the first cathode, the second anode and the second cathode in the plasma generating system to meet the jet temperature and speed, and through the setting of the second air inlet pipe and the air guide pipe and the setting of the auxiliary heating component, the gas in the secondary heating can be better mixed to achieve the stability of the jet, so that the heating of the spray material is uniform, and the spraying effect is improved. The first anode and the second anode are both composed of a plurality of segmented anode units, and each anode unit is isolated by an insulating layer to reduce the risk of local overheating. At the same time, a separate first cooling chamber and a second cooling chamber are provided to cooperate with the heat exchange system to distribute the cooling of the first anode and the second anode to avoid local burning damage and extend the life of the anode by more than 50%. The modular design facilitates maintenance and replacement of damaged units. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic cross-sectional structural diagram of a spray gun according to an embodiment of the present invention; Figure 3 is a circuit diagram of a power module and a plasma generating system in an embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a nozzle in an embodiment of the present invention; Figure 5 It is a circuit module diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0018] The embodiments of the present invention are: refer to Figures 1 to 5 As shown, a surface spraying device for a ligament stretcher includes a frame, a power module 1, a control system 2, a gas supply system 3, a powder delivery system 4, a heat exchange system 5, a plasma generation system 6 and a spray gun 7; The gas supply system 3 includes a first gas tank 31, a second gas tank 32, a first air pump 33, a second air pump 34, a first switch valve 35, a second switch valve 36, a first connecting pipe 37 and a second connecting pipe 38; The plasma generating system 6 includes an anode assembly and a cathode assembly, wherein the anode assembly includes a first anode 61 and a second anode 62, wherein the first anode 61 and the second anode 62 are each composed of a plurality of segmented anode units 601, preferably six, wherein each of the anode units 601 is isolated by an insulating layer 602, and the plurality of anode units 601 and the insulating layer 602 form a ring-shaped structure, and the cathode assembly includes a first cathode 63 and a second cathode 64; The spray gun 7 includes a primary heating component 71, a secondary heating component 72, an auxiliary heating component 73, three air guide pipes 74, a first air inlet pipe 75, two second air inlet pipes 76, two water inlet pipes 77, two water outlet pipes 78 and a nozzle 79. The primary heating component 71 includes a first shell 711, the first shell 711 has a first flow channel, the first anode 61 and the first cathode 63 are respectively arranged in the first flow channel, so that the first flow channel forms a first gas flow channel 712 and a first cooling chamber 713 isolated from each other, the first gas flow channel 712 is an annular structure, the first air inlet pipe 75 is connected to the input end of the first gas flow channel 712, the first gas tank 31 is connected to the first air inlet pipe 75 through the first connecting pipe 37, the first air pump 33 and the first switch valve 35 are arranged on the first connecting pipe 37, the secondary heating component 72 includes a second shell 721, the second shell 721 has a second flow channel, the second anode 62 and the second cathode 64 are respectively arranged The second flow channel is formed into a second gas flow channel 722 and a second cooling chamber 723 which are isolated from each other. Each of the air guide pipes 74 is connected to the input end of the first gas flow channel 712 and the output end of the second gas flow channel 722. Each of the second air inlet pipes 76 is connected to a part of the air guide pipes 74. The second gas tank 32 is connected to the second air inlet pipe 76 through the second connecting pipe 38. The second air pump 34 and the second switch valve 36 are arranged on the second connecting pipe 38. The two water inlet pipes 77 are connected to the second gas inlet pipe 76. The water outlet of the heat exchange system 5 is respectively connected to the first cooling chamber 713 and the second cooling chamber 723, the two water outlet pipes 78 are respectively connected to the water inlet of the heat exchange system 5 and the first cooling chamber 713 and the second cooling chamber 723, the auxiliary heating component 73 is arranged on the second air inlet pipe 76, the nozzle 79 is arranged on the second shell 721, and the nozzle 79 has an air injection channel 791 and a powder channel 792 connected to the second gas flow channel 722, and the powder channel 792 is connected to the powder feeding system 4; The power module 1 includes a main power supply 11 and multiple sub-power supplies 12, each of the sub-power supplies 12 is respectively connected to each anode unit 601, and the power module 1, gas supply system 3, powder delivery system 4, heat exchange system 5, and plasma generation system 6 are respectively electrically connected to the control system 2.

[0019] In this embodiment, the auxiliary heating component 73 is an electromagnetic induction component.

[0020] In the surface spraying device of the ligament stretcher, the gas in the first gas tank 31 enters the first gas flow channel 712 through the first air inlet pipe 75, and generates an arc by energizing the first anode 61 and the first cathode 63, so that the gas forms plasma to generate a high-temperature and high-speed jet to achieve primary heating, and then the high-temperature and high-speed jet is introduced into the second shell 721 through the air guide pipe 74. At the same time, the second air inlet pipe 76 is connected to a part of the air guide pipe 74, and an auxiliary heating component 73 is provided on the second air inlet pipe 76. The gas in the second gas tank 32 is preliminarily heated in the second air inlet pipe 76, and the electromagnetic field generated by the auxiliary heating component 73 can affect the movement direction of particles in the jet. The gas entering from the second air inlet pipe 76 can be quickly integrated into the airflow in the air guide pipe 74 and achieve one-time mixing, and the gas in multiple air guide pipes 74 enters the second gas flow channel 722 and is mixed again, and generates an arc by energizing the second anode 62 and the second cathode 64, so that the gas forms plasma to generate a high-temperature and high-speed jet to achieve secondary heating, so that the jet The temperature and speed of the flow meet the requirements, and the spraying material entering from the nozzle 79 is heated to a molten state by the jet and then sprayed on the surface of the ligament stretcher. The secondary heating achieved in this way can reduce the power of the first anode 61, the first cathode 63, the second anode 62 and the second cathode 64 in the plasma generating system 6 to meet the jet temperature and speed. In addition, through the setting of the second air inlet pipe 76 and the air guide pipe 74 and the setting of the auxiliary heating component 73, the gas in the secondary heating can be better mixed to achieve the stability of the jet, so that the heating of the spraying material is uniform, and the spraying effect is improved. The first anode 61 and the second anode 62 are both composed of a plurality of segmented anode units 601, and each anode unit 601 is isolated by an insulating layer 602 to reduce the risk of local overheating. At the same time, a separate first cooling chamber 713 and a second cooling chamber 723 are provided to cooperate with the heat exchange system to distribute the cooling of the first anode 61 and the second anode 62 to avoid local burning damage and extend the life of the anode by more than 50%. The modular design facilitates maintenance and replacement of damaged units.

[0021] In addition, the first gas tank 31 is filled with argon, and the second gas tank 32 is filled with 85% to 95% argon and 5% to 15% hydrogen, preferably 93% argon and 7% hydrogen. Argon is an inert gas, which is easy to ionize and has stable chemical properties, providing a stable plasma basic environment. Hydrogen is a reducing gas with high thermal conductivity, which can significantly increase the temperature and jet velocity of the plasma. By mixing the two, a higher jet velocity can be generated to make the molten particles denser and reduce the porosity of the coating. The argon is heated at the first stage and then mixed with hydrogen for secondary heating, which can ensure the stability of the mixed gas and improve the safety of use.

[0022] Furthermore, the angle between the central axis of the second air inlet pipe 76 and the central axis of the air guide pipe 74 is 30° to 70°, preferably 43°, to improve the mixing effect of the gas.

[0023] In this embodiment, the nozzle 79 includes a nozzle body 793, the jet channel 791 is distributed at the central axis of the nozzle body 793, the powder channel 792 includes a main powder channel 101 and an auxiliary powder channel 102, the output end of the main powder channel 101 is connected to the middle of the jet channel 791, the auxiliary powder channel 102 connects the middle of the main powder channel 101 and the middle of the jet channel 791, the jet channel 791 includes an air guide portion 103 and a spraying portion 104, the diameter of the air guide portion 103 gradually decreases from the input end to the output end, the diameter of the input end of the air guide portion 103 is smaller than the diameter of the output end of the spraying portion 104, the spraying portion The diameter of 104 increases gradually from the input end to the output end, the ratio of the axial length of the air guide portion 103 to the axial length of the spraying portion 104 is 3 to 6:1, preferably 5:1, the output end of the main powder channel 101 is distributed in the middle of the air guide portion 103, and the output end of the auxiliary powder channel 102 is distributed at the connection between the air guide portion 103 and the spraying portion 104, the angle between the central axis of the main powder channel 101 and the central axis of the jet channel 791 is 95° to 120°, preferably 98°, and the angle between the central axis of the auxiliary powder channel 102 and the central axis of the jet channel 791 is 60° to 90°, preferably 70°.

[0024] The jet is compressed and guided by the air guide part 103 to increase the flow rate and the local temperature. The spray material enters the impact jet at the main powder channel 101 to achieve sufficient heating. At the same time, the auxiliary powder channel 102 is set to compensate the spray material in the area with the maximum flow rate, which can improve the smoothness of the spray material entering the jet channel 791, thereby ensuring the uniformity of the spray material entering, and then diffused and sprayed through the spray part 104 to achieve a better spraying effect.

[0025] In addition, the first shell 711 includes a first part 201 and a second part 202 arranged at one end of the first part 201, a first gas flow channel 712 is formed between the first cathode 63 and the first anode 61, and a first cooling chamber 713 is formed between the first anode 61 and the second part 202. The second shell 721 includes a third part 203 and a fourth part 204 arranged at one end of the third part 203, a second gas flow channel 722 is formed between the second cathode 64 and the second anode 62, and a second cooling chamber 723 is formed between the second anode 62 and the fourth part 204, thereby increasing the contact areas of the first cooling chamber 713 and the second cooling chamber 723 with the first anode 61 and the second anode 62 respectively, and ensuring the fluidity of the first gas flow channel 712 and the second gas flow channel 722, thereby improving the cooling effect.

[0026] Furthermore, the insulating layer 602 is made of alumina ceramic or polyimide, preferably alumina ceramic.

[0027] In this embodiment, the spraying process includes the following steps: 1) Surface pretreatment: a. Use an ultrasonic cleaner with a frequency of 40 kHz and a power of 500 W to clean the ligament stretcher. The solvent is deionized water and medical-grade ethanol (volume ratio 3:1). The cleaning time is 10 to 15 minutes to remove grease and particulate contaminants. b. Use white corundum sand with a particle size of 80-120 mesh, a sandblasting pressure of 0.4-0.6MPa, a sandblasting angle of 80-90°, a distance of 100-150 mm, and a sandblasting time of 3-5 minutes to sandblast the surface of the ligament stretcher to remove the surface oxide layer and impurities, so that the surface roughness Ra reaches 2.5-3.5μm, increase the surface roughness, and improve the adhesion of the coating; c. Plasma activation treatment of polymer material ligament stretcher (Ar / O2 mixed gas, ratio 4:1, power 300 W, treatment time 2 to 3 minutes).

[0028] 2) Preparation of spraying materials: Spraying materials include biocompatible polymers, nano-ceramic particles and additives; The biocompatible polymer is polyetheretherketone, accounting for 70-85%, and the degree of polymerization of the polyetheretherketone is about 104; The nano ceramic particles are aluminum oxide, with a particle size of 20 to 100 nm, accounting for 15 to 30%; The additive is 0.5-1% of a silane coupling agent, such as KH550.

[0029] d. Ultrasonic dispersion of nano-ceramic particles and silane coupling agent in ethanol solution for 30 minutes (power 200 W); e. Mix the dispersion with polyetheretherketone powder (particle size 50-80 μm) in a ball mill (speed 200 rpm, time 2 hours); f. After drying, sieve (100 mesh screen) to make spray powder.

[0030] 3) Spraying process: A spraying device is used with a spraying power of 35 kW, a spraying distance of 180 mm, two types of spraying gases, one is argon, and the other is a mixture of argon (85% to 95%) and hydrogen (5% to 15%), preferably a mixture of 93% argon and 7% hydrogen, a flow rate of 45 L / min, a spraying speed of 350 mm / s, and a spraying thickness of 70 microns, to spray the surface of the ligament stretcher.

[0031] 4) Post-processing process: vacuum heat treatment furnace (vacuum degree 10 - ³ Pa), heating rate 5℃ / min to the target temperature 180~200℃, keep warm for 1~2 hours, slowly cool to room temperature, and then mechanically polish the coating surface (sandpaper size 800~1200 mesh) to reduce the surface roughness to Ra<0.8μm and improve the touch.

[0032] 5) Quality inspection standards: 1. Adhesion test According to the tensile test of ASTM C633 standard, the coating adhesion is ≥30MPa.

[0033] Wear resistance test The reciprocating friction tester (load 10 N, grinding material 316L stainless steel, cycle 10 4 times), wear amount ≤0.02 mm³ / N·m.

[0034] Biocompatibility testing Cytotoxicity test (MTT method) was performed according to ISO 10993, and the cell survival rate was ≥90%.

[0035] Corrosion resistance test After being immersed in simulated body fluid (SBF, pH 7.4, 37°C) for 28 days, the coating showed no blistering or peeling, and the corrosion rate was less than 0.01 mm / year.

[0036] By optimizing the spraying materials and process parameters, the wear resistance, corrosion resistance and biocompatibility of the ligament stretcher surface are significantly improved. At the same time, it has the advantages of environmental protection, high efficiency and low cost.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A surface spraying device for a ligament stretcher, characterized in that: It includes a frame, a power module, a control system, a gas supply system, a powder delivery system, a heat exchange system, a plasma generation system and a spray gun; The plasma generating system comprises an anode assembly and a cathode assembly, wherein the anode assembly comprises a first anode and a second anode, wherein the first anode and the second anode are both composed of a plurality of segmented anode units, wherein the anode units are isolated by an insulating layer, and the plurality of anode units and the insulating layer form a ring-shaped structure, and the cathode assembly comprises a first cathode and a second cathode; The spray gun includes a primary heating component, a secondary heating component, an auxiliary heating component, at least three air guide pipes, a first air inlet pipe, at least two second air inlet pipes, two water inlet pipes, two water outlet pipes and a nozzle, the primary heating component includes a first shell, the first shell has a first flow channel, the first anode and the first cathode are respectively arranged in the first flow channel, so that the first flow channel forms a first gas flow channel and a first cooling cavity isolated from each other, the first gas flow channel is an annular structure, the first air inlet pipe is connected to the input end of the first gas flow channel, the secondary heating component includes a second shell, the second shell has a second flow channel, the second anode and the second cathode are respectively arranged in the second flow channel, so that the first flow channel forms a first gas flow channel and a first cooling cavity isolated from each other, the first gas flow channel is annular, the first air inlet pipe is connected to the input end of the first gas flow channel, the secondary heating component includes a second shell, the second shell has a second flow channel, the second anode and the second cathode are respectively arranged in the second flow channel, The two flow channels form a second gas flow channel and a second cooling cavity isolated from each other, each of the air guide pipes is connected to the input end of the first gas flow channel and the output end of the second gas flow channel, each of the second air inlet pipes is respectively connected to part of the air guide pipes, the first air inlet pipe and each of the second air inlet pipes are respectively connected to the gas supply system, the two water inlet pipes are respectively connected to the water outlet end of the heat exchange system and the first cooling cavity and the second cooling cavity, the two water outlet pipes are respectively connected to the water inlet end of the heat exchange system and the first cooling cavity and the second cooling cavity, the auxiliary heating component is arranged on the second air inlet pipe, the nozzle is arranged on the second shell, the nozzle has an air jet channel and a powder channel connected to the second gas flow channel, and the powder channel is connected to the powder feeding system; The power module includes a main power supply and multiple sub-power supplies, each of which is connected to each anode unit respectively. The power module, gas supply system, powder delivery system, heat exchange system, and plasma generation system are electrically connected to the control system respectively.

2. The surface spraying device of the ligament stretcher according to claim 1, characterized in that: The gas supply system includes a first gas tank, a second gas tank, a first air pump, a second air pump, a first switch valve, a second switch valve, a first connecting pipe and a second connecting pipe. The first gas tank is connected to the first air intake pipe through the first connecting pipe, and the first air pump and the first switch valve are arranged on the first connecting pipe. The second gas tank is connected to the second air intake pipe through the second connecting pipe, and the second air pump and the second switch valve are arranged on the second connecting pipe.

3. The surface spraying device of the ligament stretcher according to claim 2, characterized in that: The first gas tank is filled with argon gas, and the second gas tank is filled with 85% to 95% argon gas and 5% to 15% hydrogen gas.

4. The surface spraying device of the ligament stretcher according to claim 1, characterized in that: The angle between the central axis of the second air inlet pipe and the central axis of the air guide pipe is 30° to 70°.

5. The surface spraying device of the ligament stretcher according to any one of claims 1 to 4, characterized in that: The nozzle includes a nozzle body, the jet channel is distributed at the central axis of the nozzle body, the powder channel includes a main powder channel and an auxiliary powder channel, the output end of the main powder channel is connected to the middle of the jet channel, and the auxiliary powder channel connects the middle of the main powder channel and the middle of the jet channel.

6. The surface spraying device of the ligament stretcher according to claim 5, characterized in that: The jet channel includes an air guide portion and a spraying portion, the diameter of the air guide portion gradually decreases from the input end to the output end, the diameter of the input end of the air guide portion is smaller than the diameter of the output end of the spraying portion, the diameter of the spraying portion gradually increases from the input end to the output end, and the ratio of the axial length of the air guide portion to the axial length of the spraying portion is 3 to 6:

1.

7. The surface spraying device of the ligament stretcher according to claim 6, characterized in that: The output end of the main powder channel is distributed at the middle of the air guide part, and the output end of the auxiliary powder channel is distributed at the connection between the air guide part and the spraying part.

8. The surface spraying device of the ligament stretcher according to claim 7, characterized in that: The angle between the central axis of the main powder channel and the central axis of the jet channel is 95° to 120°, and the angle between the central axis of the auxiliary powder channel and the central axis of the jet channel is 60° to 90°.

9. The surface spraying device of the ligament stretcher according to claim 1, characterized in that: The first shell includes a first part and a second part arranged at one end of the first part, a first gas flow channel is formed between the first cathode and the first anode, and a first cooling chamber is formed between the first anode and the second part, and the second shell includes a third part and a fourth part arranged at one end of the third part, a second gas flow channel is formed between the second cathode and the second anode, and a second cooling chamber is formed between the second anode and the fourth part.

10. The surface spraying device of the ligament stretcher according to claim 1, characterized in that: The insulating layer is made of alumina ceramic or polyimide.

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