Welding device for blade repair

Abstract

The invention discloses a welding device for blade repair, and belongs to the technical field of welding devices. The welding protection device comprises the main body seat and the protection mechanism, the protection mechanism used for protecting the welding position is arranged in the middle of the upper portion of the main body seat, through the protection mechanism, the periphery of a welding area is protected through automatic expansion and unfolding of a main air curtain before welding, outward emission of welding arc light can be greatly shielded, and the welding effect is improved. Meanwhile, welding slag splashes generated during welding are intercepted, the risk of eye discomfort of operators and skin burn or equipment circuit short circuit is avoided, flexible change and adjustment can be achieved according to welding requirements, the using and protecting effects are improved, welding safety is guaranteed, meanwhile, heat radiation loss of a welding area can be reduced, and the service life of the welding area is prolonged. The method has the advantages that the local environment temperature is maintained, generation of quenched structures caused by heat input fluctuation is reduced, brittleness and cold cracks at the welding position caused by too fast heat loss due to direct exposure welding are avoided, and the quality of welded finished products is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding devices, and in particular relates to a welding device for repairing blades. Background Art

[0002] Arc welding is the most widely used welding method in industrial production. The metal to be welded is used as one electrode and the welding rod is used as the other electrode. When the two electrodes are close to each other, an arc is generated. The heat generated by the arc discharge (commonly known as arc combustion) is used to melt the welding rod and the workpiece together and form a weld after condensation, thereby obtaining a strong joint in the welding process. Common arc welding methods mainly include stick arc welding, submerged arc welding, tungsten inert gas arc welding, plasma arc welding and metal arc welding. Automatic welding robots are often used to replace manual welding work. When the generator runner blades are damaged, they often need to be repaired by automatic arc welding robots.

[0003] When the current blade repair welding device is used, the existing automatic arc welding robot often works in a direct exposed manner, so that the spatter generated during the welding process will be sprayed onto the robot arm and the surrounding area of ​​the blade without shielding, which can easily burn the operator or damage nearby flammable materials such as cables and hydraulic pipelines. There are certain safety hazards. In addition, direct exposed welding increases the heat field and heat radiation loss in the welding area, and there is a tendency for weld brittleness and cold cracks to occur.

[0004] Therefore, we propose a blade repair welding device to solve the above-mentioned problems. Summary of the Invention

[0005] The existing technology has direct exposed welding work, which can easily burn operators or damage nearby flammable materials such as cables and hydraulic pipelines, posing certain safety hazards. It will also increase the thermal field and heat radiation loss in the welding area, and there will be problems such as weld brittleness and the tendency of cold cracks. The purpose of the present invention is to provide a welding device for blade repair.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a blade repair welding device, comprising a main body seat and a protective mechanism, wherein the protective mechanism for protecting the welding position is arranged in the upper middle part of the main body seat, and the protective mechanism comprises a storage bin, a main air pipe, an air supply pump, a main air curtain, an elastic piston rod, a ventilation cavity, an air inlet valve and an exhaust valve, the upper middle part of the storage bin is connected to the main air pipe, and the input end of the main air pipe is provided with an air supply pump, the main air curtain is provided in the inner middle part of the storage bin, and the elastic piston rod is installed in the rear middle part of the storage bin, the ventilation cavity is provided on the outside of the rear end of the elastic piston rod, and the air inlet valve is installed above the rear end of the ventilation cavity, and the exhaust valve is installed below the rear end of the ventilation cavity; A first piston pull rod is installed above the rear surface of the storage bin, and a first air distribution cylinder is provided on the outside of the rear end of the first piston pull rod, first air distribution pipes are connected on both sides of the middle of the first air distribution cylinder, and the output end of the first air distribution pipe is connected to the first secondary air curtain, a connecting plate is fixed on one side of the first secondary air curtain, and the other side of the connecting plate is connected to the second secondary air curtain, a second piston pull rod is installed below the rear surface of the storage bin, and a second air distribution cylinder is provided on the outside of the rear end of the second piston pull rod, one side of the rear end of the second air distribution cylinder is connected to the air intake pipe, and second air distribution pipes are connected on both sides of the outside of the front end of the second air distribution cylinder.

[0007] Furthermore, the main body seat includes a mechanical arm, a mounting seat and an arc welding head. The mounting seat is installed below the front end of the mechanical arm, and the arc welding head is installed in the middle below the mounting seat.

[0008] Furthermore, the air supply pump is connected to the main air curtain through the main air pipe, the elastic piston rod is elastically slidably connected to the ventilation chamber, and the ventilation chamber is opened on the inner periphery of the mounting seat, the air intake valve is connected to the air supply pump, and the storage bin, main air pipe and main air curtain are arranged in four groups in a ring around the mounting seat.

[0009] Furthermore, the first piston pull rod and the second piston pull rod are slidingly connected to the first air distribution cylinder and the second air distribution cylinder respectively, and the first air distribution cylinder is connected to the first air distribution pipe and the first auxiliary air curtain, and the second air distribution cylinder is connected to the second air distribution pipe and the second auxiliary air curtain, the two groups of the air intake pipes are respectively connected to the second air distribution cylinder and the first air distribution cylinder, and the two groups of the air intake pipes are respectively connected to the air supply pump.

[0010] Furthermore, an absorption mechanism for absorbing welding waste gas is provided in the middle of the protection mechanism, and the absorption mechanism includes an adsorption chamber, an air bleed pipe, a separation pipe and an air guide pipe. The two sides of the adsorption chamber are connected to the air bleed pipe, and a separation pipe is provided below the air bleed pipe. The lower side of the separation pipe is connected to the air guide pipe, and the air guide pipe is communicated with the separation pipe, the air bleed pipe and the adsorption chamber.

[0011] Furthermore, the absorption mechanism also includes an air suction hood, an air suction head, a connecting head and a collection tank. The air suction hood is installed below the air guide pipe, and the air suction head is installed on the lower surface of the air suction hood. The connecting head is installed in the lower middle part of the separation tube, and the collection tank is installed below the connecting head. The collection tank is connected to the connecting head and the separation tube.

[0012] Furthermore, the absorption mechanism also includes an air outlet and a nozzle. The air outlet is provided at the lower part of the main air curtain, and the outside of the air outlet is connected to the nozzle. The air outlet is communicated with the main air curtain and the nozzle.

[0013] Furthermore, a supporting mechanism for stable support is installed on the outer surface of the protective mechanism, and the supporting mechanism includes a fixed slide, a folding frame, a sliding block and a connecting shaft. The folding frame is installed in the lower middle part of the fixed slide, and the sliding block is fixedly installed on the upper end surface of the folding frame. A connecting shaft is provided in the middle of the folding frame, and the sliding block is slidably connected to the fixed slide.

[0014] Furthermore, a fixing mechanism for position limitation is provided at the bottom of the protective mechanism, and the fixing mechanism includes a contact seat, a magnetic sheet and a ball bearing. The magnetic sheet is installed on the lower surface of the contact seat, and the ball bearing is rotatably installed on the bottom surface of the magnetic sheet.

[0015] Furthermore, the fixing mechanism also includes an inflation cavity and support strips. The main air curtain, the first auxiliary air curtain and the second auxiliary air curtain are each provided with an inflation cavity, and three groups of support strips are provided in the middle of the inner side of the inflation cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses a protective mechanism to automatically expand and deploy the main air curtain before welding to form a surrounding protection for the welding area, which can greatly block the outward emission of the welding arc and intercept the welding slag splashes generated during welding, avoiding the risk of eye discomfort, skin burns or equipment circuit short circuit for the operator. In addition, the first and second air curtains are automatically and step-by-step deployed when the area is expanded, forming a dynamic change protection of the welding area, so that the device can be flexibly changed and adjusted according to the needs of welding, improving the use and protection effects, and ensuring the safety of welding. At the same time, the protection formed by the air curtain can reduce the heat radiation loss in the welding area after deployment, maintain the local ambient temperature, and help reduce the formation of hardened structure caused by heat input fluctuations, and avoid direct exposure to welding, which causes excessive heat loss and causes brittleness and cold cracks in the weld, thereby helping to improve the quality of the finished weld.

[0017] 2. The present invention can absorb the smoke generated during welding through the absorption mechanism, and when the absorbed smoke passes through the separation tube, the particulate impurities in the smoke can be separated, so that the impurities fall into the collection tank, and the separated gas enters the adsorption bin to purify and adsorb the smoke, so that the gas sucked into the air supply pump is relatively neat, and is conducive to driving the smoke to float up. The shielding formed by the main air curtain on all sides can be more conducive to the floating of the smoke and be absorbed by the suction head, which is conducive to improving the effect of smoke absorption to ensure the safety of the ambient air during welding. At the same time, it can form a closed loop of pollution absorption, purification, and reuse of inflation, which is conducive to improving the utilization of the energy of the air supply pump and avoiding the consumption and waste of single inflation and single absorption.

[0018] 3. The present invention can expand with the deployment of the main air curtain through the folding frame, thereby limiting the position of the main air curtain when it is deployed, maintaining the verticality of the main air curtain, and preventing the possibility of deformation of the main air curtain. Through the soft contact seat and small magnetic magnetic sheet made of the same material as the main air curtain, it can contact and adsorb with the surface of the blade after deployment, so as to improve the positioning protection of the welding area after the main air curtain is deployed. The support strip is made of memory metal, which remains flexible and bendable at room temperature and can be deployed and compressed with the air curtain. When the welding temperature rises, it automatically deploys and supports, thereby forming the internal skeleton of the air curtain to prevent the collapse of the air curtain under high temperature, thereby further ensuring the stability of the position and shape of the air curtain, and avoiding deformation of the air curtain and affecting the working stability and safety of the welding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall external three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the unfolded three-dimensional structure of the main air curtain of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the three-dimensional structure when viewed from above; Figure 4 This is a schematic diagram of the internal three-dimensional structure of the ventilation cavity of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the left-view stereoscopic structure; Figure 6 This is a schematic diagram of a partially separated three-dimensional structure of the first gas distribution pipe of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the absorption mechanism of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the air suction hood of the present invention when viewed from above; Figure 9 This is a partial cross-sectional schematic diagram of the internal three-dimensional structure of the main air curtain of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of the three-dimensional structure viewed from above.

[0020] In the figure: 1, main body; 101, robot arm; 102, mounting base; 103, arc welding head; 2, protective mechanism; 201, storage compartment; 202, main air pipe; 203, air supply pump; 204, main air curtain; 205, elastic piston rod; 206, ventilation cavity; 207, air inlet valve; 208, exhaust valve; 209, first piston pull rod; 210, first air distributor; 211, first air distributor; 212, first auxiliary air curtain; 213, connecting piece; 214, second auxiliary air curtain; 215, second piston pull rod; 216, second air distributor; 21 7. Air inlet pipe; 218. Second air distribution pipe; 3. Absorption mechanism; 301. Adsorption chamber; 302. Air duct; 303. Separation pipe; 304. Air guide pipe; 305. Suction hood; 306. Suction head; 307. Connecting head; 308. Collection tank; 309. Air outlet; 310. Injection head; 4. Support mechanism; 401. Fixed slide; 402. Folding frame; 403. Sliding block; 404. Connecting shaft; 5. Fixing mechanism; 501. Contact seat; 502. Magnetic sheet; 503. Ball bearing; 504. Inflatable chamber; 505. Support bar. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] To solve the problem of direct exposed welding, which is easy to burn the operator or damage nearby flammable materials such as cables and hydraulic pipes, there are certain safety hazards, and it will increase the heat field and heat radiation loss in the welding area, and there will be problems such as weld brittleness and cold cracks. Figure 1 - Figure 7 As shown: A welding device for blade repair includes a main base 1 and a protective mechanism 2 arranged in the upper middle part of the main base 1. The main base 1 includes a robotic arm 101 installed in the upper middle part of the main base 1. A mounting base 102 is installed below the front end of the robotic arm 101, and an arc welding head 103 is installed in the lower middle part of the mounting base 102. The main base 1, the robotic arm 101 and the arc welding head 103 are automatic welding robots of existing known technology, and their specific principles will not be repeated in this case.

[0023] The protective mechanism 2 includes a storage bin 201 arranged on the outside of the mounting base 102, a main air pipe 202 is connected to the upper middle part of the storage bin 201, and an air supply pump 203 is provided at the input end of the main air pipe 202, a main air curtain 204 is provided in the inner middle part of the storage bin 201, and an elastic piston rod 205 is installed in the rear middle part of the storage bin 201, a ventilation cavity 206 is provided on the outside of the rear end of the elastic piston rod 205, and an air inlet valve 207 is installed above the rear end of the ventilation cavity 206, and an exhaust valve 208 is installed below the rear end of the ventilation cavity 206. The four groups of main air pipes 202, air inlet valves 207 and air inlet pipes 217 are all connected to the air outlet end of the air supply pump 203.

[0024] A first piston pull rod 209 is installed above the rear surface of the storage bin 201, and a first air distribution cylinder 210 is provided on the outside of the rear end of the first piston pull rod 209. The first air distribution pipe 211 is connected to both sides of the middle part of the first air distribution cylinder 210, and the output end of the first air distribution pipe 211 is connected to the first sub-air curtain 212. A connecting plate 213 is fixed to one side of the first sub-air curtain 212, and the other side of the connecting plate 213 is connected to the second sub-air curtain 214. A second piston pull rod 215 is installed below the rear surface of the storage bin 201, and a second air distribution cylinder 216 is provided on the outside of the rear end of the second piston pull rod 215. The rear end side of the second air distribution cylinder 216 is connected to the air intake pipe 217, and the front end of the second air distribution cylinder 216 is connected to the second air distribution pipe 218 on both sides.

[0025] The air supply pump 203 is connected to the main air curtain 204 through the main air pipe 202, the elastic piston rod 205 is elastically slidably connected to the ventilation chamber 206, and the ventilation chamber 206 is opened on the inner periphery of the mounting seat 102, the air intake valve 207 is connected to the air supply pump 203, and the storage bin 201, the main air pipe 202 and the main air curtain 204 are arranged in four groups in a ring about the mounting seat 102.

[0026] The first piston pull rod 209 and the second piston pull rod 215 are slidingly connected to the first gas distribution cylinder 210 and the second gas distribution cylinder 216 respectively, and the first gas distribution cylinder 210 is connected to the first gas distribution pipe 211 and the first auxiliary air curtain 212, and the second gas distribution cylinder 216 is connected to the second gas distribution pipe 218 and the second auxiliary air curtain 214, the two groups of air intake pipes 217 are connected to the second gas distribution cylinder 216 and the first gas distribution cylinder 210 respectively, and the two groups of air intake pipes 217 are connected to the air supply pump 203 respectively, the main air curtain 204, the first auxiliary air curtain 212 and the second auxiliary air curtain 214 are all made of high-temperature resistant ceramic fiber cloth, which can withstand temperatures above 1200°C to prevent damage by sputtered welding slag.

[0027] When the robot arm 101 adjusts the arc welding head 103 to the position where the blade is to be repaired, the air supply pump 203 starts to make gas, and the gas is first filled into the main air curtain 204 through the main air pipe 202. The main air curtain 204 folded in the storage bin 201 will be expanded and squeezed by the continuously filled gas and unfolded downward, and the four sets of main air curtains 204 can be aligned with each other after unfolding, so that the arc welding head 103 and the surrounding welding area of ​​its bottom can be enclosed and protected. When the welding area is large and the area to be shielded is large, the four sets of ventilation cavities 206 corresponding to the main air curtains 204 are The air inlet valve 207 is opened, allowing the gas to be filled into the rear end of the ventilation chamber 206. As the gas is continuously filled, the air pressure will squeeze the elastic piston rod 205 to move forward, allowing the elastic piston rod 205 to drive the storage bin 201 and the main air curtain 204 to move together, to expand the area formed by the four sets of main air curtains 204. After the movement position is appropriate, the air inlet valve 207 is closed to maintain the position of the elastic piston rod 205. After the welding is completed, the exhaust valve 208 is opened so that the elastic piston rod 205 is pushed back to its original position by the spring, and the air supply pump 203 sucks air in the opposite direction, causing the main air curtain 204 to shrink.

[0028] When the storage bin 201 moves forward, the first piston pull rod 209 will be driven to move together with the storage bin 201, and the first gas distribution cylinder 210 is fixedly connected to the mounting base 102, which will cause the first piston pull rod 209 to move forward in the first gas distribution cylinder 210. When the first piston pull rod 209 moves forward a short distance together, the air inlet of the first gas distribution pipe 211 will be exposed to the rear section of the first gas distribution cylinder 210, and then the air is taken in at the air inlet pipe 217 of the first gas distribution cylinder 210, so that the gas can be passed into the first gas distribution pipes 211 on both sides through the first gas distribution cylinder 210. The output end of the first air distribution pipe 211 is separately connected to the first auxiliary air curtain 212, so that gas can be filled into the first auxiliary air curtain 212 to expand and unfold. As the main air curtain 204 moves outward and expands, the first auxiliary air curtain 212 can be automatically unfolded to fill the expanded gap, so that the four main air curtains 204 can still maintain good shielding protection. When the storage compartment 201 continues to move forward and expand, the second piston pull rod 215 will be driven forward, so that the air inlet of the second air distribution pipe 218 is exposed to the rear section of the second air distribution cylinder 216, so that the second air distribution cylinder 216 can The air inlet pipe 217 can pass the gas into the second air distribution pipe 218 set on both sides, and the second air distribution pipe 218 is independently connected to the second auxiliary air curtain 214, so that the second auxiliary air curtain 214 can be expanded and deployed to shield and protect the gap that continues to expand. In this way, the automatic expansion and deployment of the main air curtain 204 before welding forms a surrounding protection for the welding area, which can greatly block the outward emission of the welding arc and intercept the welding slag splashes generated during welding, avoiding the risk of eye discomfort, skin burns or equipment circuit short circuit for the operator, and expanding the area. The first air curtain 212 and the second air curtain 214 are automatically and step-by-step deployed at the same time, and the dynamic change protection of the welding area formed thereby enables the device to be flexibly changed and adjusted according to the requirements of welding, thereby improving the effect of use and protection and ensuring the safety of welding. At the same time, the protection formed by the air curtains can reduce the heat radiation loss in the welding area after deployment, maintain the local ambient temperature, and help reduce the formation of hardened structure caused by heat input fluctuations, and avoid direct exposure to welding so as to cause excessive heat loss and the generation of brittleness and cold cracks in the weld, thereby helping to improve the quality of the finished weld.

[0029] In order to solve the problem that harmful smoke and dust are easily diffused into the air during welding, polluting the working environment, and requiring separate absorption equipment for suction, which causes energy waste, such as Figure 1 - Figure 3 as well as Figure 7-Figure 9 As shown: An absorption mechanism 3 for absorbing welding waste gas is provided in the middle of the protection mechanism 2. The absorption mechanism 3 includes an adsorption chamber 301 arranged at the upper end of the air supply pump 203. The two sides of the adsorption chamber 301 are connected to the air bleed pipe 302, and a separation pipe 303 is provided below the air bleed pipe 302. An air guide pipe 304 is connected to the lower side of one side of the separation pipe 303, and the air guide pipe 304 is connected to the separation pipe 303, the air bleed pipe 302 and the adsorption chamber 301. The adsorption chamber 301 is connected to the air inlet end of the air supply pump 203, and the adsorption chamber 301 is provided with existing adsorption materials such as activated carbon.

[0030] An air suction hood 305 is installed below the air guide pipe 304, and an air suction head 306 is installed on the lower surface of the air suction hood 305. A connecting head 307 is installed in the middle of the lower part of the separation tube 303, and a collecting tank 308 is installed below the connecting head 307. The collecting tank 308 is connected to the connecting head 307 and the separation tube 303.

[0031] The absorption mechanism 3 also includes an air outlet 309 and an air nozzle 310. The air outlet 309 is provided at the lower part of the main air curtain 204, and the air nozzle 310 is connected to the outside of the air outlet 309. The air outlet 309 is connected to the main air curtain 204 and the air nozzle 310. Through the absorption mechanism 3, the smoke generated by welding can be absorbed while providing protection.

[0032] Through the air supply pump 203, it can use the adsorption bin 301, the air duct 302, the separation pipe 303 and the air guide pipe 304 to absorb air from the air suction head 306 below the air suction hood 305 during the air making operation, and the air suction hood 305 and the air suction head 306 are arranged on the outer periphery of the lower surface of the mounting base 102, so that when the air suction head 306 inhales air, the smoke generated during welding can be absorbed, and when the absorbed smoke passes through the existing cyclone separator-type separation pipe 303, the particulate impurities in the smoke can be separated, so that the impurities fall into the collection tank 308, and the separated gas continues to enter the adsorption bin 301 through the air duct 302 to purify and adsorb the smoke, so that the gas inhaled into the air supply pump 203 is relatively clean, avoiding the air supply pump 203 fills the air curtain with polluted gas, which affects the effectiveness of the air curtain. At the same time, the main air curtain 204 has an outlet 309 of the pressure relief valve, which can discharge the excess gas from the nozzle head 310. The nozzle head 310 opening points to the mounting seat 102, so that the excess gas can be blown toward the air flow of the mounting seat 102, which is conducive to driving the smoke to float up. The shielding formed by the main air curtain 204 on all sides can be more conducive to the floating of smoke and be absorbed by the suction head 306, which is conducive to improving the effect of smoke absorption to ensure the safety of the ambient air during welding. At the same time, it can form a closed loop of pollution absorption, purification, and reuse of inflation, which is conducive to improving the utilization of the energy of the air supply pump 203 and avoiding the consumption and waste of single inflation and single absorption.

[0033] In order to solve the problem that the protective structure is prone to displacement and deformation during welding, which affects the working stability and safety of the welding area, such as Figure 1 - Figure 3 as well as Figure 9 and Figure 10 As shown: The outer surface of the protective mechanism 2 is installed with a supporting mechanism 4 for stable support. The supporting mechanism 4 includes a fixed slide 401 arranged on the inner front surface of the storage bin 201. A folding frame 402 is installed in the lower middle part of the fixed slide 401, and a sliding block 403 is fixedly installed on the upper end surface of the folding frame 402. A connecting shaft 404 is provided in the middle of the folding frame 402, and the sliding block 403 is slidably connected to the fixed slide 401.

[0034] A fixing mechanism 5 for position limitation is provided at the bottom of the protective mechanism 2. The fixing mechanism 5 includes a contact seat 501 fixed to the bottom of the main air curtain 204. A magnetic sheet 502 is installed on the lower surface of the contact seat 501, and a ball 503 is rotatably installed on the bottom surface of the magnetic sheet 502.

[0035] The fixing mechanism 5 also includes an inflation cavity 504 and a support bar 505 . An inflation cavity 504 is provided inside the main air curtain 204 , the first auxiliary air curtain 212 and the second auxiliary air curtain 214 , and three groups of support bars 505 are provided in the middle of the inner side of the inflation cavity 504 .

[0036] Through the folding frame 402, it can expand as the main air curtain 204 is unfolded by sliding the connecting shaft 404 and the fixed slide 401, so that when the main air curtain 204 is unfolded, the folding frame 402 is used to limit the main air curtain 204 to maintain its verticality and prevent the main air curtain 204 from being deformed. Through the soft contact seat 501 and the small magnetic magnetic sheet 502 made of the same material as the main air curtain 204, it can be in contact with and adsorbed on the surface of the blade after unfolding, so as to improve the positioning protection of the welding area after the main air curtain 204 is unfolded. Through the support bar 505 made of memory metal, it remains flexible and bendable at room temperature, can unfold and compress with the air curtain, and automatically unfolds and supports when the welding temperature rises, thereby forming the internal skeleton of the air curtain to prevent the collapse of the air curtain under high temperature, thereby further ensuring the stability of the position and shape of the air curtain, and avoiding deformation of the air curtain and affecting the working stability and safety of the welding area.

[0037] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A blade repair welding device, comprising a main body (1) and a protective mechanism (2), characterized in that: The protection mechanism (2) for protecting the welding part is arranged in the upper middle part of the main body seat (1), and the protection mechanism (2) comprises a storage bin (201), a main air pipe (202), an air supply pump (203), a main air curtain (204), an elastic piston rod (205), a ventilation cavity (206), an air inlet valve (207) and an air outlet valve (208). The upper middle part of the storage bin (201) is connected to the main air pipe (202), and the main air pipe (202) An air supply pump (203) is provided at the input end of the storage chamber (201), a main air curtain (204) is provided at the inner middle portion of the storage chamber (201), and an elastic piston rod (205) is installed at the rear middle portion of the storage chamber (201), a ventilation cavity (206) is provided outside the rear end of the elastic piston rod (205), an air intake valve (207) is installed above the rear end of the ventilation cavity (206), and an exhaust valve (208) is installed below the rear end of the ventilation cavity (206); A first piston pull rod (209) is installed above the rear surface of the storage bin (201), and a first air distribution cylinder (210) is arranged outside the rear end of the first piston pull rod (209), first air distribution pipes (211) are connected to both sides of the middle of the first air distribution cylinder (210), and the output end of the first air distribution pipe (211) is connected to a first air curtain (212), a connecting plate (213) is fixed to one side of the first air curtain (212), and a second air curtain (214) is connected to the other side of the connecting plate (213), a second piston pull rod (215) is installed below the rear surface of the storage bin (201), and a second air distribution cylinder (216) is arranged outside the rear end of the second piston pull rod (215), an air intake pipe (217) is connected to one side of the rear end of the second air distribution cylinder (216), and second air distribution pipes (218) are connected to both sides of the front end of the second air distribution cylinder (216).

2. A blade repair welding device according to claim 1, characterized in that: The main body (1) comprises a mechanical arm (101), a mounting seat (102) and an arc welding head (103); the mounting seat (102) is mounted below the front end of the mechanical arm (101), and the arc welding head (103) is mounted in the middle portion below the mounting seat (102).

3. A blade repair welding device according to claim 2, characterized in that: The air supply pump (203) is connected to the main air curtain (204) through the main air pipe (202), the elastic piston rod (205) is elastically slidably connected to the ventilation cavity (206), and the ventilation cavity (206) is opened on the inner periphery of the mounting seat (102), the air inlet valve (207) is connected to the air supply pump (203), and the storage bin (201), the main air pipe (202) and the main air curtain (204) are arranged in four groups in an annular shape with respect to the mounting seat (102).

4. The blade repair welding device according to claim 1, characterized in that: The first piston pull rod (209) and the second piston pull rod (215) are slidably connected to the first gas distribution cylinder (210) and the second gas distribution cylinder (216), respectively. The first gas distribution cylinder (210) is connected to the first gas distribution pipe (211) and the first auxiliary air curtain (212), and the second gas distribution cylinder (216) is connected to the second gas distribution pipe (218) and the second auxiliary air curtain (214). The two groups of air intake pipes (217) are connected to the second gas distribution cylinder (216) and the first gas distribution cylinder (210), respectively. The two groups of air intake pipes (217) are connected to the air supply pump (203).

5. The blade repair welding device according to claim 1, characterized in that: An absorption mechanism (3) for absorbing welding waste gas is provided in the middle of the protection mechanism (2), the absorption mechanism (3) comprising an adsorption chamber (301), an air bleed pipe (302), a separation pipe (303) and an air guide pipe (304), the air bleed pipe (302) being connected to both sides of the adsorption chamber (301), the separation pipe (303) being provided below the air bleed pipe (302), the air guide pipe (304) being connected to the lower side of one side of the separation pipe (303), and the air guide pipe (304) being in communication with the separation pipe (303), the air bleed pipe (302) and the adsorption chamber (301).

6. The blade repair welding device according to claim 5, characterized in that: The absorption mechanism (3) further comprises an air suction hood (305), an air suction head (306), a connecting head (307) and a collecting tank (308); the air suction hood (305) is installed below the air guide pipe (304), and the air suction head (306) is installed on the lower surface of the air suction hood (305); the connecting head (307) is installed in the middle portion below the separation tube (303), and the collecting tank (308) is installed below the connecting head (307); the collecting tank (308) is connected to the connecting head (307) and the separation tube (303).

7. The blade repair welding device according to claim 5, characterized in that: The absorption mechanism (3) further comprises an air outlet (309) and an air nozzle (310), wherein the air outlet (309) is provided below the interior of the main air curtain (204), and the air nozzle (310) is connected to the exterior of the air outlet (309), and the air outlet (309) is in communication with the main air curtain (204) and the air nozzle (310).

8. The blade repair welding device according to claim 1, characterized in that: A support mechanism (4) for stable support is installed on the outer surface of the protection mechanism (2), and the support mechanism (4) includes a fixed slide (401), a folding frame (402), a sliding block (403) and a connecting shaft (404). The folding frame (402) is installed in the middle of the lower part of the fixed slide (401), and the sliding block (403) is fixedly installed on the upper end surface of the folding frame (402). A connecting shaft (404) is provided in the middle of the folding frame (402), and the sliding block (403) is slidably connected to the fixed slide (401).

9. The blade repair welding device according to claim 1, characterized in that: The bottom of the protective mechanism (2) is provided with a fixing mechanism (5) for position limitation, the fixing mechanism (5) comprising a contact seat (501), a magnetic sheet (502) and a ball (503), the lower surface of the contact seat (501) being mounted with the magnetic sheet (502), and the bottom surface of the magnetic sheet (502) being rotatably mounted with the ball (503).

10. The blade repair welding device according to claim 9, characterized in that: The fixing mechanism (5) further comprises an inflation cavity (504) and a support bar (505); the main air curtain (204), the first auxiliary air curtain (212), and the second auxiliary air curtain (214) are all provided with an inflation cavity (504) inside, and three groups of support bars (505) are provided in the middle of the inner side of the inflation cavity (504).

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