Automatic welding repair equipment for local defects of cold roll

Abstract

The invention relates to the technical field of welding repair, in particular to cold roll local defect automatic welding repair equipment which comprises a machine tool and a flame cleaning assembly. The flame cleaning assembly comprises a semicircular flame tube, and tuyeres are installed on the two sides of the flame tube in a penetrating mode correspondingly; the design of the flame tube and the two tuyeres is adopted, so that flame forms two flame rings on the outer side of the cold roll to comprehensively clean the flame, annular air suction is formed between the two flame rings, the sprayed flame rings are changed in direction under the adsorption action of wind power and get close to the middle, the flame rings cannot be diffused to the outside, and the flame ring cleaning effect is improved. The local vortex or reverse flow phenomenon of the curved surface structure of the cold roll can be prevented, cleaning is more uniform, and due to the fact that a large amount of air can be sucked in the flame cleaning process, the highest peak value of the flame temperature can be reduced, and local thermal stress concentration caused by high flame temperature is reduced; and scraped impurities after combustion can be collected under the action of the suction force.

Description

Technical Field

[0001] The invention relates to the technical field of welding repair, in particular to an automatic welding repair device for local defects of a cold rolling roll. Background Art

[0002] During the welding repair process, flame cleaning is a commonly used surface treatment technology, which is mainly used to remove oxides, oil stains, rust and other impurities from the welding parts to ensure the welding quality. Surface pollutants before welding will cause welding defects, such as pores, slag inclusions, insufficient weld strength, etc. Therefore, cleaning the welding surface is a key step to ensure welding quality. Flame cleaning uses the heat energy of high-temperature flames to heat oxides and other impurities on the metal surface to a melting or burning state, thereby removing these pollutants. It has the advantages of being fast, efficient, and easy to operate, and is suitable for surface cleaning of various metal materials. In addition, flame cleaning can be performed at the welding site, reducing the complexity of subsequent processing.

[0003] The Chinese patent with announcement number CN111097989B discloses a thermal deburring device, including a fuel mixing mechanism, a combustion chamber mechanism and a clamping mechanism. The three sets of valve cores and valve seats of the gas intake and exhaust valves are sealed in the form of an inner hole inverted cone. The valve core and valve seat are made of soft and hard materials with good sealing reliability, strong anti-fouling ability and long service life of the original parts.

[0004] A Chinese patent with announcement number CN114951900B discloses a flame cutting machine, including a body, a guide rod, a spray gun seat and a cutting spray gun. The invention arranges an iron powder box with a powder outlet on a support frame, and a toggle plate is rotatably connected at the powder outlet. Iron powder is discharged from the powder outlet to lay the cutting seam line. The vibrating toggle rod toggles the powder outlet so that the iron powder is discharged smoothly, thereby achieving the effect of stably providing iron powder for the cutting seam.

[0005] In the above-mentioned and similar prior arts, the high temperature generated by the flame can reach over 1000°C. This high temperature may not only lead to the tempering softening of the quenching layer on the surface of the cold rolling roller, but also cause local thermal stress concentration, thereby causing microcracks on the surface. However, when the flame temperature is too low, problems such as incomplete combustion and incomplete impurity cleaning may occur. Therefore, it is difficult and challenging to keep the peak temperature of the flame within a suitable impurity cleaning temperature range. In addition, the curved surface structure changes the airflow path, induces velocity gradients and pressure imbalances, causing the flame propagation direction to be disordered and forming local eddies or countercurrents, which can easily cause uneven cleaning of the oxide layer. Due to the characteristics of the flame, it is difficult for the operator to accurately control the ejected flame, and the reflected escaping flame can easily cause safety hazards to the surrounding environment and staff, increasing the risk of accidents. After the flame is cleaned, the impurities after combustion need to be further scraped and cleaned, which increases the labor intensity.

[0006] Therefore, the present invention provides an automatic welding repair device for local defects of a cold rolling roll, which can uniformly and stably perform comprehensive flame cleaning on the cold rolling roll. Summary of the invention

[0007] Aiming at the problems in the prior art that the flame temperature is highly concentrated during flame cleaning on the surface of the cold rolling roller, which easily leads to thermal stress concentration, the curved surface structure easily leads to flame tempering, and local eddy current or backflow is easily formed, an automatic welding repair equipment for local defects of the cold rolling roller is designed.

[0008] The technical solution adopted by the present invention to solve its technical problems is: an automatic welding repair device for local defects of cold rolling rollers, including a machine tool and a repair roller placed inside the machine tool, a second driving member is slidably arranged on the top of the machine tool, a welding gun is slidably installed on one side of the second driving member, and flame cleaning components that can move left and right are respectively arranged on both sides of the second driving member; the flame cleaning component includes a semicircular flame tube, air nozzles are respectively installed on both sides of the flame tube, and a plurality of suction holes are arranged in an array on one side of the flame tube close to the center of the circle, and a complete circle is formed by the flame tubes in the two flame cleaning components, so that the flame sprayed from the air nozzle forms a complete flame ring to flame clean the surface of the repair roller, and the suction holes change the trajectory of the flame and absorb impurities at the same time.

[0009] Furthermore, the machine tool includes two parts, a base and a casing. A fixed seat is fixedly installed on the top of the base. Two slide rails are fixedly installed on the top of the base, and the two slide rails are located on one side of the fixed seat. A sliding seat is slidably installed on the top of the two slide rails. Two driving rollers are rotatably installed on the top of the fixed seat and the sliding seat respectively through bearings. The driving rollers can rotate synchronously in the same direction through a driving mechanism. The repair roller is located on the top of the driving roller and is in friction contact with the driving roller.

[0010] Furthermore, a first driving member is fixedly installed on the top of the casing of the machine tool, a slide plate is slidably installed on the top of the first driving member, one side of the slide plate is fixedly connected to a second driving member, and the second driving member is used to drive the welding gun to move up and down.

[0011] Furthermore, the flame cleaning assembly also includes a gas pipe, a plurality of L-shaped flame nozzles are installed through the side of the gas pipe close to the center of the circle, and the output end of the flame nozzle is located through the inner side of the flame tube, and a gas port is installed through the side of the gas pipe away from the center of the circle.

[0012] Furthermore, a plurality of limit plates are installed in an array on one side of the flame tube close to the center of the circle, and a plurality of oxygen holes are penetrated through the side of the flame tube away from the center of the circle, and the oxygen holes are located at the output end of the flame nozzle.

[0013] Furthermore, a through hole is formed through one end of the flame tube, and an output end of a flame nozzle is formed through the other end of the flame tube.

[0014] Furthermore, two semicircular air nozzles are respectively installed on both sides of the flame tube, and a flame-spraying port is opened on the inner side of the air nozzle.

[0015] Furthermore, an isolation plate is fixedly installed on the inner side of the flame tube, and the isolation plate divides the inner side of the flame tube into two chambers, a flame chamber and a wind chamber. The space on the side of the isolation plate in the flame tube away from the center of the circle is the flame chamber, and the space on the side close to the center of the circle is the wind chamber. The air suction hole is connected to the wind chamber, and two air suction pipes are installed through the interior of the isolation plate, and the air suction pipes run through the interior of the flame tube.

[0016] Furthermore, telescopic members are respectively installed through both sides of the second driving member, and the output end of the telescopic member is fixedly connected to the top of the air pipe through a bracket.

[0017] Beneficial effects of the present invention: The automatic welding repair equipment for local defects of cold rolling rollers described in the present invention adopts the design of a flame tube and two air nozzles, so that the flame forms two flame circles on the outside of the cold rolling roller for comprehensive flame cleaning, and forms an annular suction wind between the two flame circles, so that the ejected flame circle changes direction and moves closer to the middle under the adsorption effect of wind force, which not only prevents the flame circle from spreading to the outside and reduces safety hazards, but also prevents local eddy currents or backflows from occurring in the curved surface structure of the cold rolling roller, making the flame more stable and the cleaning more uniform. Moreover, since a large amount of air is inhaled during flame cleaning, the peak temperature of the flame can be adjusted, so that the peak temperature of the flame is maintained within a suitable impurity cleaning temperature range, reducing the local thermal stress concentration caused by the high temperature of the flame, and the impurities scraped off after burning can also be collected under the action of suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the welding repair equipment of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the bracket of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the inner side of the flame cleaning assembly of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of the flame cleaning assembly of the present invention; Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the flame tube of the present invention; Figure 6 It is a structural schematic diagram of another form of the crater of the present invention; Figure 7 For the present invention Figure 5 Schematic diagram of the local enlarged structure at point A.

[0020] In the figure: 1. machine tool; 2. fixed seat; 3. sliding seat; 4. driving roller; 5. repair roller; 6. second driving member; 7. welding gun; 8. flame cleaning assembly; 81. gas pipe; 82. flame nozzle; 83. flame tube; 84. limit plate; 85. oxygen hole; 86. through hole; 87. air nozzle; 88. flame nozzle; 89. isolation plate; 810. air suction hole; 811. gas outlet; 812. air suction pipe; 9. flame chamber; 10. air chamber. DETAILED DESCRIPTION

[0021] In order to make the technical means, technical features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] Example: Figure 1-Figure 7 As shown, an automatic welding repair device for local defects of a cold rolling roller described in the present invention comprises a machine tool 1 and a repair roller 5 placed inside the machine tool 1, a second driving member 6 is slidably arranged on the top of the machine tool 1, a welding gun 7 is slidably installed on one side of the second driving member 6, and the welding gun 7 can move up and down, the machine tool 1 comprises a base and a casing, a fixed seat 2 is fixedly installed on the top of the base, two slide rails are fixedly installed on the top of the base, and the two slide rails are located on one side of the fixed seat 2, a sliding seat 3 is slidably installed on the top of the two slide rails, two driving rollers 4 are rotatably installed on the top of the fixed seat 2 and the sliding seat 3 respectively through bearings, the driving roller 4 can rotate synchronously in the same direction through a driving mechanism, and the repair roller 5 is located on the top of the driving roller 4 and is in friction contact with the driving roller 4.

[0023] Specifically, the base of the machine tool 1 can provide support for the casing and other equipment, the base can provide support for the fixed seat 2 and the slide rail, the sliding seat 3 can slide along the top of the slide rail under power drive to adapt to the length of the repair roller 5, and the driving mechanism can provide a rotational driving force for the driving roller 4. The driving mechanism can be a combination of a motor and a chain sprocket, or a combination of a motor and a pulley. The surface of the driving roller 4 can provide sufficient friction. When the staff places the repair roller 5 on the top of the driving roller 4, the driving mechanism drives all the driving rollers 4 to rotate synchronously in the same direction, so that the driving roller 4 can use the friction force to drive the repair roller 5 to rotate.

[0024] In this embodiment, a first driving member is fixedly installed on the top of the casing of the machine tool 1, a slide is slidably installed on the top of the first driving member, one side of the slide is fixedly connected to the second driving member 6, and the second driving member 6 is used to drive the welding gun 7 to move up and down.

[0025] Specifically, the first driving member or the second driving member can be a combination of a motor, a screw and a slide rail. The motor drives the screw to rotate, and the threaded action of the screw and the slide rail drives the slide rail to move. The first driving member can also be a linear guide rail to drive the slide rail to move. The slide rail can provide stable support for the second driving member 6, so that the second driving member 6 can stably drive the welding gun 7 to move up and down. When welding repair is required, the welding gun 7 is driven to move to the top of the repair roller 5 to work.

[0026] In this embodiment, flame cleaning components 8 that can move left and right are respectively provided on both sides of the second driving member 6; the flame cleaning component 8 includes a semicircular flame tube 83, and air nozzles 87 are respectively installed on both sides of the flame tube 83. A plurality of air suction holes 810 are arranged in an array on one side of the flame tube 83 close to the center of the circle. The flame tubes 83 in the two flame cleaning components 8 form a complete circle, so that the flame sprayed from the air nozzles 87 forms a complete flame ring to flame clean the surface of the repair roller 5. The air suction holes 810 change the flame trajectory and absorb impurities at the same time. The flame cleaning component 8 also includes an air supply pipe 81, and a plurality of L-shaped flame nozzles 82 are installed on one side of the air supply pipe 81 close to the center of the circle, and the output end of the flame nozzle 82 is located on the inner side of the flame tube 83, and a gas port 811 is installed on the side of the air supply pipe 81 away from the center of the circle.

[0027] Specifically, the gas pipe 81 is used to transport fuel gas, which generates a high-temperature flame after mixing with oxygen. The external gas pipeline is fixedly connected to the gas port 811, so that the external gas enters the gas pipe 81 through the gas port 811, and the gas is transported to multiple flame nozzles 82 through the gas pipe 81, so that the flame nozzles 82 burn the gas and spray flames. The two semicircular flame tubes 83 form a complete circular flame tube 83, so that the flame cleaning assembly 8 can perform comprehensive flame cleaning on the surface of the cold rolling roller.

[0028] In this embodiment, a plurality of limit plates 84 are installed in an array on one side of the flame tube 83 close to the center, and a plurality of oxygen holes 85 are penetrated through the side of the flame tube 83 away from the center, and the oxygen holes 85 are located at the output end of the flame nozzle 82 .

[0029] Specifically, the flame tube 83 can provide a stable support for the limit plate 84, and the limit plate 84 can provide a limiting effect for the flame tube 83. When the flame cleaning component 8 is driven to move, the flame tube 83 drives the limit plate 84 to contact the surface of the cold rolling roller, so that any position of the flame roller maintains the same distance from the surface of the cold rolling roller, thereby controlling the contact area between the flame and the cold rolling roller. At the same time, the limit plate 84 can scrape off impurities. When flame cleaning is performed, the driving roller 4 drives the cold rolling roller to rotate, and the limit plate 84 performs axial movement, so that the limit plate 84 and the cold rolling roller rotate relative to each other, so that the limit plate 84 cleans the impurities on the surface of the cold rolling roller, and cooperates with the flame cleaning to provide a cleaning effect. The oxygen hole 85 can allow outside air to enter the flame tube 83. When the flame nozzle 82 is working, the ejected fuel gas accelerates the air flow near the oxygen hole 85, so that a negative pressure is generated inside the flame tube 83 to inhale outside air from the oxygen, and the outside air is mixed with the fuel gas for combustion.

[0030] In this embodiment, a through hole 86 is formed through one end of the flame tube 83 , and an output end of the flame nozzle 82 is formed through the other end of the flame tube 83 .

[0031] Specifically, one end of the flame tube 83 can provide a penetration space for the through hole 86, and the other end can provide a penetration space for the output end of the flame nozzle 82. When the telescopic member drives the two flame cleaning components 8 close to each other, the two ends of the two flame tubes 83 are respectively connected, so that the output end of the flame nozzle 82 at one end of the flame tube 83 enters the inner side of the through hole 86 at one end of the other flame tube 83, so that the flame sprayed by the flame nozzle 82 forms a closed loop along the same rotation direction, thereby forming a complete flame circle, so as to improve the integrity and overall uniformity of the flame cleaning area.

[0032] In this embodiment, two semicircular air nozzles 87 are respectively installed on both sides of the flame tube 83 , and a flame-spraying port 88 is formed on the inner side of the air nozzles 87 .

[0033] Specifically, the flame tube 83 can provide a fixed connection for the tuyere 87, and the tuyere 87 can provide a through-opening space for the flame vent 88. Figure 5 or Figure 6 As shown, it can be a continuous through groove or a plurality of arrays of circular holes, so that the flame can evenly contact the surface of the repair roller 5. When the flame sprayed out by the flame nozzle 82 is compressed, the flame escapes from the air nozzles 87 on both sides, so that the flame forms a complete ring for cleaning, which can provide uniformity and stability of the flame and reduce the local thermal stress concentration caused by the high temperature of the flame.

[0034] In this embodiment, an isolation plate 89 is fixedly installed on the inner side of the flame tube 83, and the isolation plate 89 divides the inner side of the flame tube 83 into two chambers, a flame chamber 9 and a wind chamber 10. The space on the side of the isolation plate 89 away from the center of the circle in the flame tube 83 is the flame chamber 9, and the space on the side close to the center of the circle is the wind chamber 10. The suction hole 810 is connected to the wind chamber 10, and two suction pipes 812 are installed through the interior of the isolation plate 89, and the suction pipes 812 pass through the interior of the flame tube 83.

[0035] Specifically, the flame tube 83 can provide a stable support for the isolation plate 89, and the isolation plate 89 can provide an isolation effect, and at the same time can provide a squeezing effect for the flame, thereby reducing the storage space of the flame in the flame tube 83, thereby squeezing the flame to the outside of the flame tube 83, and the flame cavity 9 can provide a storage space for the flame, and the wind cavity 10 can provide a circulation channel for air flow, so that the suction pipe 812 can provide a fixed connection with the external suction equipment, and the suction pipe 812 is connected with the external suction equipment, so that the suction equipment sucks air through the suction pipe 812, and the suction pipe 812 sucks air from the outside through the wind cavity 10 and the suction hole 810 Inhaling air can not only prevent the flame circle from spreading to the outside, but also prevent local eddy currents or backflows from occurring in the curved surface structure of the cold rolling roller, making the flame more stable and the cleaning more uniform. A large amount of air will be inhaled during the suction process, thereby lowering the highest peak value of the flame temperature and reducing the local thermal stress concentration caused by the high temperature of the flame. By changing the power of the suction equipment (adjusting the suction wind force), the peak temperature of the flame can be adjusted to keep the peak temperature of the flame within a suitable impurity cleaning temperature range, thereby ensuring that the flame can perform flame cleaning on the repair roller 5 and at the same time absorb and collect the impurities scraped off by the limit plate 84.

[0036] In this embodiment, telescopic members are respectively installed through both sides of the second driving member 6 , and the output end of the telescopic member is fixedly connected to the top of the air delivery pipe 81 through a bracket.

[0037] Specifically, the telescopic part can drive the two flame cleaning components 8 to move closer to or away from each other. When the cold rolling roller needs to be flame cleaned, the flame tube 83 is moved to the vicinity of the repair roller 5 through the telescopic part. When welding repair is required, the flame tube 83 is driven away from the repair roller by the telescopic part to facilitate continuous work.

[0038] Working principle: Before working, the external gas pipeline is fixedly connected with the gas port 811, so that the external gas enters the gas transmission pipe 81 through the gas port 811, and the suction pipe 812 is connected with the external suction equipment, so that the suction equipment sucks air through the suction pipe 812. The staff puts the repair roller 5 with damaged surface on the top of the driving roller 4, starts the telescopic parts to move the two flame cleaning components 8 to the two sides of the repair roller 5, so that the output end of the flame nozzle 82 at one end of one flame tube 83 is inserted into the through hole 86 at one end of the other flame tube 83, and the two semicircular flame tubes 83 are formed into a complete circle by plugging; The driving mechanism is started to make the driving roller 4 rotate synchronously in the same direction, so that the driving roller 4 drives the repair roller 5 to rotate by friction, and the first driving member drives the flame cleaning assembly 8 to move along the axial direction of the repair roller 5 through the second driving member 6, and the flame nozzle 82 is started to work. The flame nozzle 82 sprays flames from the output end through the gas in the gas pipe 81, and the sprayed flames blow in the flame cavity 9. At the same time, due to the negative pressure formed by the air flow at the output end of the flame nozzle 82, the external oxygen enters the flame tube 83 through the oxygen hole 85, so that the gas burns more fully. Since the flame sprayed by the flame nozzle 82 is relatively large, and the space inside the flame cavity 9 is narrow and compressed, the flame is sprayed from the air nozzles 87 on both sides, and then two annular flame rings are formed under the guidance of the air nozzles 87; When the suction device is working, the air in the wind cavity 10 is sucked out through the suction pipe 812, so that the flame tube 83 forms a negative pressure suction at the position of the suction hole 810, and a large amount of air from the outside is sucked in. Since the suction hole 810 is located in the middle of the two flame circles, the ejected flame circle changes direction and moves closer to the middle under the adsorption effect of the wind force, which not only prevents the flame circle from spreading to the outside, but also prevents the local eddy current or backflow phenomenon from occurring in the curved surface structure of the cold rolling roller, making the flame more stable and the cleaning more uniform. Since a large amount of air is sucked in during flame cleaning, the highest peak value of the flame temperature can be reduced, and the local thermal stress concentration caused by the high temperature of the flame can be reduced. When performing flame cleaning, the cold rolling roller rotates, and the flame cleaning component 8 moves under the action of the first driving member, so that the limit plate 84 can scrape off the impurities burned on the surface of the cold rolling roller. The scraped impurities will enter the wind cavity 10 under the adsorption effect of the fine air holes, so as to realize the cleaning and collection of the impurities burned. After the flame cleaning is completed, the telescopic member is started to move the flame cleaning assembly 8 away from the cold rolling roller, and the welding gun 7 is used to perform welding repair.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic welding repair device for local defects of a cold rolling roll, comprising a machine tool (1) and a second driving member (6) slidably arranged on the top thereof, a welding gun (7) being slidably mounted on one side of the second driving member (6), characterized in that: Flame cleaning components (8) that can move left and right are respectively provided on both sides of the second driving member (6); The flame cleaning assembly (8) comprises a semicircular flame tube (83), air nozzles (87) are respectively installed on both sides of the flame tube (83), and a plurality of air suction holes (810) are arranged in an array on one side of the flame tube (83) close to the center of the circle. The flame tubes (83) in the two flame cleaning assemblies (8) form a complete circle, so that the flame ejected from the air nozzles (87) forms a complete flame ring to perform flame cleaning on the surface of the repair roller (5). The air suction holes (810) change the trajectory of the flame and absorb impurities at the same time. The air suction wind force provided by the air suction holes (810) can adjust the peak temperature of the flame, so that the peak temperature of the flame is maintained within a suitable impurity cleaning temperature range.

2. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 1 is characterized in that: The machine tool (1) comprises a base and a casing. A fixed seat (2) is fixedly mounted on the top of the base. Two slide rails are fixedly mounted on the top of the base, and the two slide rails are located on one side of the fixed seat (2). A sliding seat (3) is slidably mounted on the top of the two slide rails. Two driving rollers (4) are rotatably mounted on the top of the fixed seat (2) and the sliding seat (3) respectively via bearings. The driving rollers (4) can rotate synchronously in the same direction via a driving mechanism. A repair roller (5) is located on the top of the driving roller (4) and is in frictional contact with the driving roller (4).

3. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 2 is characterized in that: A first driving member is fixedly mounted on the top of the casing of the machine tool (1), a slide plate is slidably mounted on the top of the first driving member, one side of the slide plate is fixedly connected to a second driving member (6), and the second driving member is used to drive the welding gun (7) to move up and down.

4. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 1 is characterized in that: The flame cleaning assembly (8) further comprises a gas delivery pipe (81), a plurality of L-shaped flame spray heads (82) being installed through a side of the gas delivery pipe (81) close to the center of the circle, and an output end of the flame spray head (82) being installed through an inner side of a flame tube (83), and a gas outlet (811) being installed through a side of the gas delivery pipe (81) away from the center of the circle.

5. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 1 is characterized in that: A plurality of limit plates (84) are installed in an array on one side of the flame tube (83) close to the center of the circle, and a plurality of oxygen holes (85) are provided through the side of the flame tube (83) away from the center of the circle, and the oxygen holes (85) are located at the output end of the flame nozzle (82).

6. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 5 is characterized in that: A through hole (86) is formed through one end of the flame tube (83), and an output end of the flame nozzle (82) is formed through the other end of the flame tube (83).

7. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 6 is characterized in that: Two semicircular air nozzles (87) are respectively installed through the two sides of the flame tube (83), and a flame-spraying port (88) is provided through the inner side of the air nozzle (87).

8. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 7 is characterized in that: An isolation plate (89) is fixedly installed on the inner side of the flame tube (83), and the isolation plate (89) divides the inner side of the flame tube (83) into two chambers, namely a flame chamber (9) and a wind chamber (10). The space on the side of the isolation plate (89) away from the center of the circle in the flame tube (83) is the flame chamber (9), and the space on the side close to the center of the circle is the wind chamber (10). The air suction hole (810) is connected to the wind chamber (10), and two air suction pipes (812) are installed through the interior of the isolation plate (89), and the air suction pipes (812) penetrate the interior of the flame tube (83).

9. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 4 is characterized in that: Telescopic members are respectively installed through both sides of the second driving member (6), and the output end of the telescopic member is fixedly connected to the top of the air delivery pipe (81) through a bracket.

Images