A device for repairing tiny cracks on the surface of metal structures

Abstract

The present invention discloses a device for repairing micro cracks on the surface of a metal structure, specifically comprising a base, an upper plate fixedly connected to the middle of the front side of the base, welding devices fixedly installed on the left and right sides of the front side of the upper plate, and a mixing bag fixedly connected to the lower right side of the welding device, and the present invention relates to the field of crack repair technology. The device for repairing micro cracks on the surface of a metal structure continuously melts and repairs solder powder and metal matrix materials through a welding device, and at the same time, a flushing wiper movably connected at the inner cavity of the unfolded part is pushed and gradually moves, and the flushing wiper swings slightly, and the crack scraper changes from the default folded state to the stretched state. The crack scraper has the function of protecting the solder point of the device, preventing the molten point from flowing arbitrarily and affecting the processing accuracy, thereby enabling the device to have the function of automatic welding, with the purpose of improving the welding effect at the gap crack and promoting the neatness of the molten liquid.

Description

Technical Field

[0001] The invention relates to the technical field of crack repair, in particular to a device for repairing tiny cracks on the surface of a metal structure. Background Art

[0002] In a broad sense, metal cracks are defects in which the continuity of the metal is destroyed, and at the same time have a certain depth, width and length, and are distributed in straight lines or curves on the surface or inside of the metal. This is called a crack. In a narrow sense, the so-called crack is a phenomenon in which the surface or inside of the metal is straight or curved, and is relatively long. The metal surface is easily affected by the impact load of the workpiece and cracks appear, which can be repaired by welding.

[0003] In the prior art, the cracks on the metal surface are mainly repaired by welding process, which utilizes the continuous melting of solder powder and metal matrix material to make the metal matrix material and the repair material tightly bond together to complete the purpose of repair. However, it is easy for the welding melt to be too much or too little, resulting in the metal surface being not smooth enough, which is not conducive to the beauty and experience of the metal. Summary of the invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problems is:

[0005] A device for repairing micro cracks on the surface of a metal structure, specifically comprising:

[0006] A base, an upper plate is fixedly connected in the middle of the front of the base, and welding devices are fixedly installed on the left and right sides of the front of the upper plate. The setting of the welding device can prevent the melting point from flowing arbitrarily and affecting the processing accuracy, so that the equipment has the function of automatic welding, which has the purpose of improving the welding effect at the gap crack and promoting the neatness of the molten liquid. The welding device is composed of left and right parts, and a mixing bag is fixedly connected at the lower right part of the welding device. A protective welding shell is fixedly connected in the middle of the front of the upper plate, and a welding workpiece is movably connected at the angle formed between the left and right parts of the welding device, and a receiving tray is provided inside the welding workpiece;

[0007] A welding device, wherein a central support block is slidably connected to the inner groove of the welding device, a dispensing bag is fixedly connected to the right side below the front of the base, a bag body is provided inside the dispensing bag, a positioning device is movably connected inside the protective welding shell, a dredging pipe is fixedly connected to the front of the welding device, and the dredging pipe has a guide fitting;

[0008] The positioning device comprises:

[0009] The lower circular support plate ensures the accuracy of welding through the setting of the positioning device, prevents the situation where the welding center is lowered due to the vibration on both sides when the axial body rotates and moves, which is beneficial to improving the welding processing quality. The circular support plate is fixedly connected to the axial body at the axis center, and the middle outer surface of the axial body is rotatably connected to a placement bracket, and the left and right sides of the placement bracket are fixedly connected to push plates, and the outer surface of the placement bracket is slidably connected to a protective plate layer, and the bottom outer surface of the axial body is movably connected to a swing block, and the right side of the swing block is fixedly connected to a plug-in cylinder, and the top outer surface of the axial body is fixedly connected to an anti-overheating device. Through the setting of the anti-overheating device, the rotating blades convert the internal displacement force into wind force, and the sensor prevents internal overheating from affecting the processing accuracy, while improving the protection of the human body and playing an auxiliary temperature regulation effect.

[0010] Furthermore, the angle between the base and the deployment bag is designed to be ninety degrees, adhesive is coated between the upper plate and the base, the height of the welding device is higher than the height of the deployment bag, and the welding device is located on the outer surface of the welding workpiece.

[0011] Furthermore, the placement support is connected to the central support block through a pushing plate, a groove corresponding to the axial body is opened on the inner side of the placement support, the pushing plates are two on the left and right, and are symmetrically designed about the center line of the placement support, the overheating prevention device also includes a circular plate, a plug-in connector is fixedly connected to the top of the circular plate, a rotating blade is fixedly connected to the outer surface of the plug-in connector, the rotation of the circular plate drives the plug-in connector to operate, the plug-in connector links the rotating blades to synchronously displace, the rotating blades rotate to a certain extent, and the rotating blades convert the internal displacement force into wind force, a temperature sensor is fixedly connected to the top of the placement support, a sensor is fixedly connected to the top of the temperature sensor, the rotating blades are evenly distributed with reference to the axis of the axial body, there are three temperature sensors, and the temperature sensors are evenly distributed with reference to the central axis of the axial body, the temperature sensor is plugged into the inner wall of the placement support, the sensor contains a chip, the diameter of the circular plate is larger than the diameter of the sensor, and the temperature sensor is made of metal stainless steel.

[0012] Furthermore, the welding device includes a main support block, the inner side of the main support block is movably connected with a push block, the side of the push block close to the welding workpiece is fixedly connected to a limiting head, the outer surface of the top of the limiting head is fixedly connected to a sleeve locking head, the top of the center support block is fixedly connected to a fine welding head, the end of the fine welding head away from the push block is fixedly connected to an expansion piece, the lower surface of the expansion piece is movably connected to a crack scraper, the barbs on the outer surface of the limiting head are gradually snapped into the inside of the sleeve locking head, the inside of the sleeve locking head defaults to the preset optimal welding force point, and then Positioning is formed at the intersection to avoid affecting the welding effect due to excessive or insufficient displacement force. A fine welding joint is fixedly connected to the top of the center support block, and a flush wiping piece is movably connected inside the unfolding piece. The center lines of the push block, the limit head and the sleeve locking head are on the same straight line. The unfolding piece is designed in an arc shape. There are two unfolding pieces in total. The flush wiping piece is welded to the outer surface of the crack scraper, and the center of the sleeve locking head and the flush wiping piece are on the same straight line. The angle between the fine welding joint and the center support block is designed to be ninety degrees.

[0013] The present invention provides a device for repairing micro cracks on the surface of a metal structure. It has the following beneficial effects:

[0014] 1. The equipment for repairing tiny cracks on the surface of metal structures is to rotate the circular support plate in the positioning device counterclockwise when it is energized. The rotation of the circular support plate drives the axis body to run synchronously. Matching reverse textures are set between the axis body and the placement support frame. The inside of the deployment capsule contains a stamped capsule, which enables the equipment to have the function of automatic welding and the basic effect of automatic positioning, laying the foundation for subsequent processing.

[0015] 2. The equipment for repairing tiny cracks on the surface of a metal structure has a guide accessory arranged between the mounting bracket and the axis body. The axis body rotates and squeezes the mounting bracket under the action of the guide accessory to move, and the mounting bracket gradually moves in the direction close to the welding workpiece, and the mounting bracket drives the pushing plate to move synchronously, and the pushing plate pushes the center support block to move synchronously, and the push block fixedly connected to the side of the center support block gradually runs synchronously, and the groove between the push block and the main board support block corresponds to the push block. Under the limiting action of the main board support block, the push block gradually acts on the center support block to move, and the center support block forms a trend of intersecting at right angles, and the axis body moves synchronously accordingly. When the axis body moves toward the middle, the axis body is aligned with the gap to be processed, so as to achieve the purpose of automatically positioning the processing port with the assistance of the displacement force on the left and right sides, thereby ensuring the accuracy of welding, and preventing the welding center from being lowered due to the vibration on both sides when the axis body rotates and moves, which is beneficial to improving the welding processing quality.

[0016] 3. The equipment for repairing tiny cracks on the surface of metal structures is inserted into the locking cavity seat inside the mainboard support block through the limit head through the socket lock. The barbs on the outer surface of the limit head are gradually snapped into the inside of the socket lock. The inside of the socket lock defaults to the preset optimal welding force point, thereby forming a positioning at the intersection, avoiding the influence of welding effect due to excessive or insufficient displacement force, and achieving the purpose of improving the welding effect.

[0017] 4. The equipment for repairing tiny cracks on the surface of metal structures continuously melts and repairs solder powder and metal matrix materials through a welding device. At the same time, the flushing wiper piece movably connected at the inner cavity of the unfolding piece is pushed and gradually moves, and the flushing wiper piece swings slightly. The flushing wiper piece adjusts the flatness of the solder melting point formed by welding. Moreover, the two unfolding pieces gradually approach to gradually unfold the crack scraper, and the crack scraper changes from the default folded state to an extended state. The crack scraper has a solder point protection function for the equipment, preventing the melting point from flowing wantonly and affecting the processing accuracy, thereby enabling the equipment to have the function of automatic welding, which has the purpose of improving the welding effect at the gap crack and promoting the neatness of the molten liquid.

[0018] 5. The equipment for repairing tiny cracks on the surface of metal structures drives the circular plate in the anti-overheating device to move by the rotation of the axial body. The rotation of the circular plate drives the plug-in connector to operate. The plug-in connector links the rotating blades to move synchronously. The rotating blades rotate to a certain extent, and the rotating blades convert the internal displacement force into wind force. The sensor prevents internal overheating from affecting the processing accuracy, while enhancing the protection of the human body and playing an auxiliary role in temperature regulation.

[0019] 6. The equipment for repairing tiny cracks on the surface of metal structures moves synchronously with the push plate under the action of the screw principle of the axial body through the plug-in cylinder. The plug-in cylinder is inserted into the interior of the mixing bag. The plug-in cylinder squeezes the interior of the mixing bag. The squeezing force is greater than the bearing capacity of the mixing bag itself. The moisture and other pre-treatment liquids in the inner cavity of the mixing bag are pushed into the inside of the dredging pipe, and drip onto the annular receiving plate in the inner cavity of the dredging pipe through the guide fittings at the top of the dredging pipe. Then the equipment has the effect of automatic cooling treatment, which provides convenience for subsequent processing and achieves the purpose of automatic and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the central support block of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the capsule of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the limit head of the present invention;

[0024] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram of the structure of the lock head at A in the middle;

[0025] Figure 6 It is a schematic diagram of the structure of the fine temperature sensor of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the dredging pipe of the present invention;

[0027] Figure 8 For the present invention Figure 1 A partial enlarged schematic diagram of the flush wiper structure at position E in the middle.

[0028] In the figure: 1. base; 2. upper plate; 3. welding device; 4. adjusting bag; 5. protective welding shell; 6. welding workpiece; 7. center support block; 8. positioning device; 9. dredging pipe; 31. main board support block; 32. fine welding joint; 33. unfolding part; 34. crack scraper; 35. push block; 36. limit head; 37. sleeve lock; 38. flush wiper; 81. round support plate; 82. axis body; 83. placement support frame; 84. push plate; 85. protective plate layer; 86. swing block; 87. plug-in cylinder; 88. anti-overheating device; 881. round plate; 882. plug-in joint; 883. rotor; 884. temperature sensing body; 885. sensor. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses. Example 1

[0030] See also Figure 1-Figure 4 , Figure 8 The present invention provides a technical solution: a device for repairing micro cracks on the surface of a metal structure, specifically comprising:

[0031] Base 1, an upper plate 2 is fixedly connected to the middle of the front of the base 1, and welding devices 3 are fixedly installed on the left and right sides of the front of the upper plate 2. The setting of the welding device 3 prevents the melting point from flowing arbitrarily and affecting the processing accuracy, so that the equipment has the function of automatic welding, has the purpose of improving the welding effect at the gap crack, and promotes the neatness of the molten liquid. The welding device 3 is composed of left and right parts, and a mixing bag 4 is fixedly connected to the lower right part of the welding device 3;

[0032] The welding device 3 includes a main support block 31, a push block 35 is movably connected to the inner side of the main support block 31, a limiting head 36 is fixedly connected to the side of the push block 35 close to the welding workpiece 6, a sleeve lock 37 is fixedly connected to the top outer surface of the limiting head 36, a fine welding head 32 is fixedly connected to the top of the central support block 7, an expansion piece 33 is fixedly connected to the end of the fine welding head 32 away from the push block 35, a crack scraper 34 is movably connected to the lower surface of the expansion piece 33, the barbs on the outer surface of the limiting head 36 are gradually snapped into the inside of the sleeve lock 37, and the inside of the sleeve lock 37 is preset as the optimal welding force point. Then, positioning is formed at the intersection to avoid affecting the welding effect due to excessive or insufficient displacement force. A fine welding head 32 is fixedly connected to the top of the center support block 7, and a flush wiping piece 38 is movably connected inside the unfolding piece 33. The center lines of the push block 35, the limit head 36 and the sleeve lock head 37 are on the same straight line. The unfolding piece 33 is designed in an arc shape. There are two unfolding pieces 33 in total. The flush wiping piece 38 is welded to the outer surface of the crack scraper 34, and the center of the sleeve lock head 37 and the flush wiping piece 38 are on the same straight line. The angle between the fine welding head 32 and the center support block 7 is designed to be ninety degrees.

[0033] When in use, first check the installation and safety protection of the present invention, start the servo motor, and the circular support plate 81 in the positioning device 8 rotates counterclockwise when energized. The rotation of the circular support plate 81 drives the axial body 82 to run synchronously. A matching reverse texture is provided between the axial body 82 and the mounting support frame 83. The inside of the deployment bag 4 contains a stamped bag body, so that the equipment has the function of automatic welding and the basic effect of automatic positioning, laying the foundation for subsequent processing.

[0034] When the intersection of the welding needs to be fixed, the push block 35 slides along the inner groove of the main board support block 31, and the push block 35 pushes the limit head 36 to move. The limit head 36 is inserted into the locking cavity seat inside the main board support block 31 through the socket lock 37. The barbs on the outer surface of the limit head 36 are gradually snapped into the inside of the socket lock 37. The inside of the socket lock 37 defaults to the preset optimal welding force point, thereby forming a positioning at the intersection, avoiding the welding effect being affected by excessive or insufficient displacement force, and achieving the purpose of improving the welding effect.

[0035] When it is necessary to weld the welding workpiece 6, the displacement of the central support block 7 drives the fine welding head 32 to move, and the unfolding piece 33 at the top of the fine welding head 32 is synchronously displaced, and the bending arc of the unfolding piece 33 gradually fits the notch of the welding workpiece 6, and the welding device 3 continuously melts and repairs the solder powder and the metal matrix material. At the same time, the flushing wiper 38 movably connected at the inner cavity of the unfolding piece 33 is pushed and gradually moves, and the flushing wiper 38 swings slightly. The flushing wiper 38 adjusts the flatness of the solder melting point formed by welding, and the two unfolding pieces 33 gradually approach to gradually unfold the crack scraper 34, and the crack scraper 34 changes from the default folded shape to the stretched shape. The crack scraper 34 has the function of protecting the solder point of the equipment, preventing the melting point from flowing arbitrarily and affecting the processing accuracy, thereby enabling the equipment to have the function of automatic welding, which has the purpose of improving the welding effect at the gap crack and promoting the neatness of the molten liquid. Example 2

[0036] See also Figure 1-Figure 8 , the present invention provides a technical solution: on the basis of embodiment 1,

[0037] A protective welding shell 5 is fixedly connected to the middle of the front side of the upper plate 2, and a welding workpiece 6 is movably connected to the angle formed between the left and right parts of the welding device 3, and a receiving tray is provided inside the welding workpiece 6;

[0038] A welding device 3, wherein a central support block 7 is slidably connected to the inner groove of the welding device 3, a dispensing bag 4 is fixedly connected to the right side below the front of the base 1, and a bag body is provided inside the dispensing bag 4, a positioning device 8 is movably connected inside the protective welding shell 5, and a dredging pipe 9 is fixedly connected to the front of the welding device 3, and the dredging pipe 9 has a flow guide fitting;

[0039] The positioning device 8 comprises:

[0040] The lower circular support plate 81 ensures the accuracy of welding through the setting of the positioning device 8, prevents the welding center from dropping due to the vibration on both sides when the axial body 82 rotates and moves, which is beneficial to improving the welding processing quality. The circular support plate 81 is fixedly connected to the axial body 82 at the axis center, and the middle outer surface of the axial body 82 is rotatably connected to the placement support frame 83. The left and right sides of the placement support frame 83 are fixedly connected to the pushing plate 84, and the outer surface of the placement support frame 83 is slidably connected to the protective plate layer 85. The bottom outer surface of the axial body 82 is movably connected to the swing block 86, and the right side of the swing block 86 is fixedly connected to the plug-in cylinder 87. The top outer surface of the axial body 82 is fixedly connected to the overheating protection device 88. Through the setting of the overheating protection device 88, the rotating blade 883 is prompted to convert the internal displacement force into wind force. The sensor 885 prevents internal overheating from affecting the processing accuracy, while improving the protection of the human body and playing an auxiliary temperature control effect.

[0041] The angle between the base 1 and the deployment bag 4 is designed to be ninety degrees, and adhesive is coated between the upper plate 2 and the base 1. The height of the welding device 3 is higher than that of the deployment bag 4, and the welding device 3 is located on the outer surface of the welding workpiece 6.

[0042] The support frame 83 is connected to the central support block 7 through the push plate 84. A groove corresponding to the axial body 82 is opened on the inner side of the support frame 83. There are two push plates 84 on the left and right, and the push plates 84 are symmetrically designed about the center line of the support frame 83. The overheating protection device 88 also includes a circular plate 881. A plug connector 882 is fixedly connected to the top of the circular plate 881. A rotating blade 883 is fixedly connected to the outer surface of the plug connector 882. The rotation of the circular plate 881 drives the plug connector 882 to run. The plug connector 882 drives the rotating blade 883 to move synchronously, and the rotating blade 883 rotates to a certain extent. The rotating blades 883 convert the internal displacement force into wind force. A temperature sensing body 884 is fixedly connected to the top of the mounting bracket 83. A sensor 885 is fixedly connected to the top of the temperature sensing body 884. The rotating blades 883 are evenly distributed with reference to the axis of the axial body 82. There are three temperature sensing bodies 884 in total, and the temperature sensing bodies 884 are evenly distributed with reference to the central axis of the axial body 82. The temperature sensing bodies 884 are plugged into the inner wall of the mounting bracket 83. The sensor 885 contains a chip. The diameter of the circular plate 881 is larger than the diameter of the sensor 885. The temperature sensing body 884 is made of metal stainless steel.

[0043] When in use, first check the installation and safety protection of the present invention, start the servo motor, and the circular support plate 81 in the positioning device 8 rotates counterclockwise when energized. The rotation of the circular support plate 81 drives the axial body 82 to run synchronously. A matching reverse texture is provided between the axial body 82 and the mounting support frame 83. The inside of the deployment bag 4 contains a stamped bag body, so that the equipment has the function of automatic welding and the basic effect of automatic positioning, laying the foundation for subsequent processing.

[0044] When it is necessary to locate the welding position at the crack notch on the outer surface of the welding workpiece 6, the placement bracket 83 and the axial body 82 are in contact with each other, and a guide accessory is provided between the placement bracket 83 and the axial body 82. Under the action of the guide accessory, the axial body 82 rotates and squeezes the placement bracket 83 to move, and the placement bracket 83 gradually moves in the direction close to the welding workpiece 6. The placement bracket 83 drives the push plate 84 to move synchronously, and the push plate 84 pushes the central support block 7 to move synchronously. The push block 35 fixedly connected to the side of the central support block 7 gradually runs synchronously, and the push block 35 and The grooves between the main board support blocks 31 correspond to each other, and the push block 35 gradually acts on the center support block 7 to move under the limiting action of the main board support block 31, and the center support block 7 tends to intersect at right angles, and the axial body 82 moves synchronously therewith. When the axial body 82 moves toward the middle, the axial body 82 is aligned with the gap that needs to be processed, so as to achieve the purpose of automatically positioning the processing port with the assistance of the displacement force on the left and right sides, thereby ensuring the accuracy of welding and preventing the welding center from dropping due to the vibration on both sides when the axial body 82 rotates and moves, which is beneficial to improving the welding processing quality.

[0045] When the internal heat needs to be regulated, the rotation of the axial body 82 drives the circular plate 881 in the anti-overheating device 88 to move, and the rotation of the circular plate 881 drives the plug-in connector 882 to operate. The plug-in connector 882 drives the rotating blade 883 to move synchronously. The rotating blade 883 rotates to a certain extent. The rotating blade 883 converts the internal displacement force into wind force. The sensor 885 prevents internal overheating from affecting the processing accuracy, while enhancing the protection of the human body and playing an auxiliary role in regulating the temperature.

[0046] When it is necessary to perform water flushing and cooling treatment on the inside, when the swing block 86 rotates, the swing block 86 is linked to the plug-in cylinder 87 to move synchronously, and the plug-in cylinder 87 is synchronously displaced with the push plate 84 under the action of the screw principle of the axial body 82. The plug-in cylinder 87 is displaced and inserted into the interior of the mixing bag 4, and the plug-in cylinder 87 squeezes the inside of the mixing bag 4. The squeezing force is greater than the bearing capacity of the mixing bag 4 itself. The moisture and other pre-treatment liquids in the inner cavity of the mixing bag 4 are pushed into the inside of the dredging pipe 9, and drip onto the annular receiving plate in the inner cavity of the dredging pipe 9 through the guide fittings at the top of the dredging pipe 9, thereby making the equipment have the effect of automatic cooling treatment, providing convenience for subsequent processing, and achieving the purpose of automatic and easy operation.

[0047] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A device for repairing micro cracks on the surface of a metal structure, comprising: A base (1), wherein an upper plate (2) is fixedly connected to the middle of the front side of the base (1), welding devices (3) are fixedly installed on the left and right sides of the front side of the upper plate (2), the welding device (3) consists of a left and a right part, and a mixing bag (4) is fixedly connected below the right part of the welding device (3), a protective welding shell (5) is fixedly connected to the middle of the front side of the upper plate (2), a welding workpiece (6) is movably connected to the angle formed between the left and right parts of the welding device (3), and a receiving tray is provided inside the welding workpiece (6); A welding device (3), wherein a central support block (7) is slidably connected to an inner groove of the welding device (3), a mixing bag (4) is fixedly connected to the right side of the lower front of the base (1), the mixing bag (4) has a bag body inside, a positioning device (8) is movably connected inside the protective welding shell (5), a dredging pipe (9) is fixedly connected to the front of the welding device (3), and the dredging pipe (9) has a guide fitting, characterized in that: The positioning device (8) comprises: A lower circular support plate (81), wherein the circular support plate (81) is fixedly connected to an axial body (82) at its axis, a middle outer surface of the axial body (82) is rotatably connected to a placement support frame (83), a push plate (84) is fixedly connected to the left and right sides of the placement support frame (83), a protective plate layer (85) is slidably connected to the outer surface of the placement support frame (83), a swing block (86) is movably connected to the outer surface of the bottom of the axial body (82), a plug-in cylinder (87) is fixedly connected to the right side of the swing block (86), and an overheating prevention device (88) is fixedly connected to the outer surface of the top of the axial body (82); The placement support frame (83) is connected to the central support block (7) via a push plate (84); a groove body corresponding to the axial body (82) is provided on the inner side of the placement support frame (83); the push plates (84) are two on the left and two on the right, and the push plates (84) are symmetrically designed with respect to the center line of the placement support frame (83); The welding device (3) comprises a main support block (31), the inner side of the main support block (31) is movably connected to a push block (35), the side of the push block (35) close to the welding workpiece (6) is fixedly connected to a limit head (36), the top outer surface of the limit head (36) is fixedly connected to a sleeve lock head (37), the top of the center support block (7) is fixedly connected to a fine welding head (32), the end of the fine welding head (32) away from the push block (35) is fixedly connected to an expansion piece (33), the lower surface of the expansion piece (33) is movably connected to a crack scraper (34), the top of the center support block (7) is fixedly connected to the fine welding head (32), and the inside of the expansion piece (33) is movably connected to a flushing wiper (38); The center lines of the push block (35), the limit head (36) and the sleeve lock head (37) are on the same straight line, the expansion piece (33) is designed in an arc shape, and there are two expansion pieces (33); The flush wiping piece (38) is welded to the outer surface of the crack scraper (34), the centers of the sleeve lock head (37) and the flush wiping piece (38) are on the same straight line, and the angle between the fine welding joint (32) and the central support block (7) is designed to be ninety degrees.

2. The metal structure surface micro-crack repairing device according to claim 1 is characterized in that: The angle between the base (1) and the mixing bag (4) is designed to be ninety degrees, an adhesive is coated between the upper plate (2) and the base (1), the height of the welding device (3) is higher than the height of the mixing bag (4), and the welding device (3) is located on the outer surface of the welding workpiece (6).

3. The metal structure surface micro-crack repairing device according to claim 1 is characterized in that: The overheating prevention device (88) further comprises a circular plate (881), a plug connector (882) being fixedly connected to the top of the circular plate (881), a rotating blade (883) being fixedly connected to the outer surface of the plug connector (882), a temperature sensing body (884) being fixedly connected to the top of the placement support frame (83), and a sensor (885) being fixedly connected to the top of the temperature sensing body (884).

4. The metal structure surface micro-crack repairing device according to claim 3 is characterized in that: The rotating blades (883) are evenly distributed with the axis of the axial body (82) as a reference. There are three temperature sensing bodies (884) in total, and the temperature sensing bodies (884) are evenly distributed with the central axis of the axial body (82) as a reference.

5. The metal structure surface micro-crack repairing device according to claim 4, characterized in that: The temperature sensing body (884) is plugged into the inner wall of the mounting bracket (83); the sensor (885) contains a chip inside; the diameter of the circular plate (881) is larger than the diameter of the sensor (885); and the temperature sensing body (884) is made of stainless steel.

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