An automated welding repair equipment for local defects of cold rolling rolls

Abstract

The present invention relates to the technical field of welding repair, specifically an automated welding repair device for local defects of cold rolling rolls, including a machine tool and a flame cleaning assembly; the flame cleaning assembly includes a semi-circular flame tube, and air nozzles are respectively installed through both sides of the flame tube; the present invention adopts the design of the flame tube and two air nozzles, so that two flame rings are formed on the outer side of the cold rolling roll for comprehensive flame cleaning, and annular air suction is formed between the two flame rings, so that the ejected flame rings change direction and move closer to the middle under the adsorption action of the wind force. This not only prevents the flame rings from spreading to the outside and reduces potential safety hazards, but also can prevent local eddy current or countercurrent phenomena in the curved surface structure of the cold rolling roll, making the cleaning more uniform. Moreover, since a large amount of air is inhaled during flame cleaning, the highest peak value of the flame temperature can be reduced, and local thermal stress concentration caused by the high temperature of the flame can be reduced. The burned impurities scraped off will also 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 welding repair, flame cleaning is a commonly used surface treatment technique, primarily used to remove oxides, oil, rust, and other impurities from the weld area to ensure weld quality. Surface contaminants before welding can lead to weld defects such as porosity, slag inclusions, and insufficient weld strength. Therefore, cleaning the weld surface is a key step in ensuring weld quality. Flame cleaning utilizes the heat energy of a high-temperature flame to melt or burn oxides and other impurities on the metal surface, thereby removing these contaminants. Flame cleaning is a fast, efficient, and easy-to-use process, making it suitable for cleaning the surfaces of various metal materials. Furthermore, flame cleaning can be performed at the welding site, reducing the complexity of subsequent processing.

[0003] The Chinese patent with the announcement number CN111097989B discloses a thermal deburring device, which includes 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 different soft and hard materials, which have good sealing reliability, strong anti-fouling ability and long service life of the original parts.

[0004] A Chinese patent with the announcement number CN114951900B discloses a flame cutting machine, including a body, a guide rod, a gun holder and a cutting gun. The invention sets an iron powder box with a powder outlet on the support frame, and rotates a toggle plate connected to the powder outlet. The 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 to 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 quenched layer on the surface of the cold rolling roller, but also induce 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 the appropriate 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 vortices 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 workers, 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 cold rolling rolls, which can comprehensively and stably perform flame cleaning on cold rolling rolls evenly. Summary of the Invention

[0007] An automatic welding repair device for local defects of cold rolling rolls is designed to address the problems in the prior art that when flame cleaning the surface of cold rolling rolls, the flame temperature is highly concentrated, which is prone to cause thermal stress concentration, the curved surface structure is prone to cause flame flashback, and local eddy currents or countercurrents are easily formed.

[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 rolls, including a machine tool and a repair roll placed inside the machine tool. A second driving member is slidably arranged on the top of the machine tool, and a welding torch is slidably installed on one side of the second driving member. 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 semi-circular flame tube. Air nozzles are respectively penetrated and installed on both sides of the flame tube. A plurality of air suction holes are arrayed and penetrated on the side of the flame tube close to the center of the circle. A complete circle is formed by the flame tubes in the two flame cleaning components, so that the flame ejected from the air nozzles forms a complete flame ring to perform flame cleaning on the surface of the repair roll, and the air suction holes change the flame trajectory while adsorbing impurities.

[0009] Further, the machine tool includes two parts: a base and a machine shell. 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 respectively rotatably installed on the tops of the fixed seat and the sliding seat through bearings. The driving rollers can rotate synchronously and in the same direction through a driving mechanism. The repair roll is located on the top of the driving rollers and is in frictional contact with the driving rollers.

[0010] Further, a first driving member is fixedly installed on the top of the machine shell part of the machine tool. A sliding plate is slidably installed on the top of the first driving member. One side of the sliding plate is fixedly connected to the second driving member, and the second driving member is used to drive the welding torch to move up and down.

[0011] Further, the flame cleaning component further includes a gas transmission pipe. A plurality of L-shaped flame spray nozzles are penetrated and installed on the side of the gas transmission pipe close to the center of the circle, and the output ends of the flame spray nozzles penetrate and are located inside the flame tube. A gas port is penetrated and installed on the side of the gas transmission pipe far from the center of the circle.

[0012] Further, a plurality of limiting plates are arrayed and installed on the side of the flame tube close to the center of the circle. A plurality of oxygen holes are penetrated on the side of the flame tube far from the center of the circle, and the oxygen holes are located at the output end positions of the flame spray nozzles.

[0013] Further, one end of the flame tube is provided with a through hole, and the output end of the flame nozzle penetrates through the other end of the flame tube.

[0014] Further, two semi-circular air nozzles are respectively installed through both sides of the flame tube, and a flame spraying port is provided through the inner side of the air nozzle.

[0015] Further, a partition plate is fixedly installed inside the flame tube. The partition plate divides the inside of the flame tube into two chambers, namely a flame chamber and an air chamber. The space on the side of the partition plate away from the center of the circle in the flame tube is the flame chamber, and the space on the side close to the center of the circle is the air chamber. The air suction holes communicate with the air chamber. Two air suction pipes are installed through the partition plate, and the air suction pipes penetrate through the inside of the flame tube.

[0016] Further, telescopic members are respectively installed through both sides of the second driving member, and the output ends of the telescopic members are fixedly connected to the top of the gas transmission pipe through brackets.

[0017] Advantages of the present invention:

[0018] For the automatic welding repair equipment for local defects of cold rolling rolls of the present invention, the design of the flame tube and two air nozzles is adopted, so that two flame rings are formed on the outer side of the cold rolling roll for comprehensive flame cleaning. An annular air suction is formed between the two flame rings, so that the ejected flame rings change direction and move closer to the middle under the adsorption action of the wind force. It will not only prevent the flame rings from spreading to the outside world and reduce potential safety hazards, but also prevent local eddy current or countercurrent phenomena that occur in the curved surface structure of the cold rolling roll, 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 also be adjusted to keep the peak temperature of the flame within a suitable impurity cleaning temperature range, reducing local thermal stress concentration caused by high flame temperature. The burned impurities scraped off will also be collected under the action of the suction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 is a three-dimensional structure schematic diagram of the welding repair equipment of the present invention;

[0021] Figure 2 is a three-dimensional structure schematic diagram of the bracket of the present invention;

[0022] Figure 3 is a three-dimensional structure schematic diagram inside the flame cleaning assembly of the present invention;

[0023] Figure 4 is a cross-sectional structure schematic diagram of the flame cleaning assembly of the present invention;

[0024] Figure 5Schematic cross-sectional three-dimensional structure diagram of the flame tube of the present invention;

[0025] Figure 6 Schematic structure diagram of another form of the flame ejection port of the present invention;

[0026] Figure 7 For the present invention Figure 5 Partial enlarged structure diagram at position A.

[0027] In the figure: 1, machine tool; 2, fixed seat; 3, sliding seat; 4, driving roller; 5, repair roller; 6, second driving member; 7, welding torch; 8, flame cleaning assembly; 81, gas transmission pipe; 82, flame nozzle; 83, flame tube; 84, limiting plate; 85, oxygen hole; 86, through hole; 87, air nozzle; 88, flame ejection port; 89, isolation plate; 810, air suction hole; 811, gas port; 812, air suction pipe; 9, flame cavity; 10, air cavity. Detailed implementation manners

[0028] In order to make the technical means, technical features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0029] Embodiment: As Figures 1 - 7 shown, an automatic welding repair device for local defects of a cold rolling roll according to the present invention includes 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 torch 7 is slidably installed on one side of the second driving member 6, and the welding torch 7 can move up and down. The machine tool 1 includes a base and a machine shell. 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. The tops of the fixed seat 2 and the sliding seat 3 are respectively rotatably installed with two driving rollers 4 through bearings. The driving rollers 4 can rotate synchronously and in the same direction through a driving mechanism. The repair roller 5 is located on the top of the driving rollers 4 and is in frictional contact with the driving rollers 4.

[0030] Specifically, the base of the machine tool 1 can provide support for the machine shell and other devices. The base can provide support for the fixed seat 2 and the slide rails. The sliding seat 3 can slide along the top of the slide rails under the drive of power to adapt to the length of the repair roller 5. The driving mechanism can provide a rotational driving force for the driving rollers 4. The driving mechanism can be a combination of a motor and a chain and sprocket, or a combination of a motor and a pulley. The surface of the driving rollers 4 can provide sufficient friction. When the staff places the repair roller 5 on the top of the driving rollers 4, the driving mechanism drives all the driving rollers 4 to rotate synchronously and in the same direction, so that the driving rollers 4 can drive the repair roller 5 to rotate by using friction.

[0031] In this embodiment, a first driving member is fixedly installed on the top of the housing part of the machine tool 1. A sliding plate is slidably installed on the top of the first driving member. One side of the sliding plate is fixedly connected to the second driving member 6, and the second driving member 6 is used to drive the welding torch 7 to move up and down.

[0032] Specifically, the first driving member or the second driving member can be a combination of a motor, a lead screw and a slide rail. The motor drives the lead screw to rotate, and the lead screw drives the sliding plate to move through the threaded action with the sliding plate. The first driving member can also be composed of a linear guide rail to drive the sliding plate to move. The sliding plate can provide a stable support for the second driving member 6, so that the second driving member 6 can stably drive the welding torch 7 to move up and down. When welding repair is required, the welding torch 7 is driven to move to the top of the repair roller 5 for work.

[0033] In this embodiment, flame cleaning components 8 that can move left and right are respectively arranged on both sides of the second driving member 6; the flame cleaning component 8 includes a semi-circular flame tube 83. Air nozzles 87 are respectively installed through both sides of the flame tube 83. A plurality of air suction holes 810 are arrayed and penetrated near the center of the circle of the flame tube 83. The two flame tubes 83 in the two flame cleaning components 8 form a complete circle, so that the flame ejected from the air nozzles 87 forms a complete flame ring to clean the surface of the repair roller 5. The air suction holes 810 adsorb impurities while changing the flame trajectory. The flame cleaning component 8 further includes an air supply pipe 81. A plurality of L-shaped flame nozzles 82 are installed through the side near the center of the circle of the air supply pipe 81, and the output ends of the flame nozzles 82 penetrate and are located inside the flame tube 83. A gas port 811 is installed through the side of the air supply pipe 81 far from the center of the circle.

[0034] Specifically, the air supply pipe 81 is used to transport gas. The gas and oxygen are mixed to generate high-temperature flame. The external gas pipeline is fixedly connected to the gas port 811, so that the external gas enters the air supply pipe 81 through the gas port 811. The gas is transported to the plurality of flame nozzles 82 through the transportation of the air supply pipe 81, so that the flame nozzles 82 burn the gas and eject the flame. The two semi-circular flame tubes 83 form a complete circular flame tube 83, so that the flame cleaning component 8 can comprehensively clean the surface of the cold rolling roll.

[0035] In this embodiment, a plurality of limiting plates 84 are arrayed and installed on the side of the flame tube 83 near the center of the circle. A plurality of oxygen holes 85 are penetrated on the side of the flame tube 83 far from the center of the circle, and the oxygen holes 85 are located at the output end positions of the flame nozzles 82.

[0036] Specifically, the flame tube 83 can provide stable support for the limiting plate 84, and the limiting plate 84 can play a role in limiting the flame tube 83. When driving the flame cleaning assembly 8 to move, the flame tube 83 drives the limiting plate 84 to contact the surface of the cold rolling roll, so that any position of the flame roll maintains the same distance from the surface of the cold rolling roll, thereby controlling the contact area between the flame and the cold rolling roll. At the same time, the limiting plate 84 can play a role in scraping impurities. When performing flame cleaning, the driving roll 4 drives the cold rolling roll to rotate, and the limiting plate 84 performs axial movement, so that the limiting plate 84 rotates relative to the cold rolling roll, thereby cleaning the impurities on the surface of the cold rolling roll by the limiting plate 84, and cooperating with the flame cleaning to provide a cleaning effect. The oxygen holes 85 can allow external air to enter the flame tube 83. When the flame nozzle 82 works, it sprays fuel gas to accelerate the air flow near the oxygen holes 85, causing a negative pressure inside the flame tube 83 to suck in external air from the oxygen, and the external air mixes with the fuel gas for combustion.

[0037] In this embodiment, a through hole 86 is formed through one end of the flame tube 83, and the output end of the flame nozzle 82 penetrates through the other end of the flame tube 83.

[0038] Specifically, one end of the flame tube 83 can provide a through-opening space for the through hole 86, and the other end can provide a through space for the output end of the flame nozzle 82. When the telescopic member drives the two flame cleaning assemblies 8 to approach each other, the two ends of the two flame tubes 83 are docked respectively, so that the output end of the flame nozzle 82 at one end of the flame tube 83 enters the inside of the through hole 86 at one end of the other flame tube 83, and the flame sprayed by the flame nozzle 82 forms a closed loop along the same rotation direction, thereby forming a complete flame circle to improve the integrity and overall uniformity of the flame cleaning area.

[0039] In this embodiment, two semi-circular air nozzles 87 are respectively installed through both sides of the flame tube 83, and a flame ejection port 88 is formed through the inside of the air nozzle 87.

[0040] Specifically, the flame tube 83 can provide a fixed connection function for the air nozzle 87, and the air nozzle 87 can provide a through-opening space for the flame ejection port 88. The flame ejection port 88 Figure 5 or Figure 6 As shown, it can be a continuous through groove or a plurality of arrayed circular holes, which is convenient for the flame to evenly contact the surface of the repair roll 5. When the flame sprayed 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 the uniformity and stability of the flame and reduce the local thermal stress concentration caused by the high temperature of the flame.

[0041] In this embodiment, a partition plate 89 is fixedly installed inside the flame tube 83. The partition plate 89 divides the inside of the flame tube 83 into two chambers, namely a flame chamber 9 and an air chamber 10. The space on the side of the partition 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 air chamber 10. The air suction holes 810 communicate with the air chamber 10. Two air suction pipes 812 are installed through the inside of the partition plate 89, and the air suction pipes 812 penetrate through the inside of the flame tube 83.

[0042] Specifically, the flame tube 83 can provide stable support for the partition plate 89. The partition plate 89 can provide an isolation function and at the same time can provide an extrusion effect on the flame, reducing the storage space of the flame in the flame tube 83, so as to squeeze the flame to the outside of the flame tube 83. The flame chamber 9 can provide a storage space for the flame, and the air chamber 10 can provide a flow channel for air flow, enabling the air suction pipes 812 to provide a fixed connection function for external air suction equipment. Connect the air suction pipes 812 to external air suction equipment, so that the air suction equipment sucks air through the air suction pipes 812. The air suction pipes 812 suck air from the outside through the air chamber 10 and the air suction holes 810. This can not only prevent the flame ring from spreading to the outside, but also prevent local eddy currents or countercurrents that occur in the curved surface structure of the cold rolling roll, making the flame more stable and the cleaning more uniform. A large amount of air will be inhaled during the air suction process, which can reduce the highest peak value of the flame temperature, reduce the local thermal stress concentration caused by the high temperature of the flame, change the power of the air suction equipment (adjust the magnitude of the air suction force), and can adjust the peak temperature of the flame 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 roll 5, and at the same time sucking and collecting the impurities scraped off by the limiting plate 84.

[0043] In this embodiment, telescopic members are respectively installed through both sides of the second driving member 6, and the output ends of the telescopic members are fixedly connected to the top of the air delivery pipe 81 through brackets.

[0044] Specifically, the telescopic members can drive the two flame cleaning assemblies 8 to approach or move away from each other. When flame cleaning of the cold rolling roll is required, the flame tube 83 is moved to the vicinity of the repair roll 5 through the telescopic members. When welding repair is required, the flame tube 83 is driven away from the repair roll by the telescopic members, which is convenient for continuous operation.

[0045] Working principle: Before working, fix and connect the external gas pipeline with the gas port 811, so that the external gas enters the gas pipeline 81 through the gas port 811, and connect the air suction pipe 812 with the external air suction device, so that the air suction device sucks air through the air suction pipe 812. The staff places the repair roller 5 with damaged surface on the top of the driving roller 4, starts the telescopic member to move the two flame cleaning components 8 to both sides of the repair roller 5, and inserts the output end of the flame nozzle 82 at one end of one flame tube 83 into the through hole 86 at one end of the other flame tube 83, and forms a complete circle by plugging the two semi-circular flame tubes 83;

[0046] Start the driving mechanism to make the driving roller 4 rotate synchronously and in the same direction, so that the driving roller 4 drives the repair roller 5 to rotate by friction. The first driving member drives the flame cleaning component 8 to move along the axial direction of the repair roller 5 through the second driving member 6. Start the flame nozzle 82 to work. The flame nozzle 82 sprays out flames from the output end through the gas in the gas pipeline 81. The sprayed flames are blown in the flame cavity 9. At the same time, due to the air flow at the output end of the flame nozzle 82, a negative pressure is formed, so that the external oxygen enters the flame tube 83 through the oxygen hole 85, making the gas burn more fully. Since the flame sprayed by the flame nozzle 82 is large and the space inside the flame cavity 9 is narrow, the flame is compressed, so that the flame sprays out from the positions of the air nozzles 87 on both sides, and then two annular flame rings are formed under the guiding action of the air nozzles 87;

[0047] When the air suction device works, it sucks out the air in the air cavity 10 through the air suction pipe 812, so that a negative pressure air suction is formed at the position of the air suction hole 810 of the flame tube 83, and a large amount of external air is inhaled. Since the air suction hole 810 is located in the middle of the two flame rings, the sprayed flame rings are adsorbed by the wind force and change direction to move closer to the middle. It will not only prevent the flame rings from diffusing to the outside, but also prevent local eddy current or countercurrent phenomena in the curved surface structure of the cold rolling roll, making the flame more stable and the cleaning more uniform. Since a large amount of air is inhaled during flame cleaning, the highest peak value of the flame temperature can be reduced, and local thermal stress concentration caused by the high temperature of the flame can be reduced. During flame cleaning, the cold rolling roll rotates, and the flame cleaning component 8 moves under the action of the first driving member, so that the limiting plate 84 can scrape the impurities after combustion on the surface of the cold rolling roll. The scraped impurities will enter the air cavity 10 under the adsorption action of the fine air holes, realizing the cleaning and collection of the impurities after combustion;

[0048] After the flame cleaning is completed, start the telescopic member to move the flame cleaning component 8 away from the cold rolling roll, and use the welding torch 7 for welding repair.

[0049] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated welding repair device for local defects of cold rolling rolls, comprising a machine tool (1) and a second driving member (6) slidably arranged on the top thereof, wherein a welding torch (7) is slidably installed on one side of the second driving member (6), and is characterized in that: On both sides of the second driving member (6), there are respectively arranged flame cleaning components (8) that can move left and right; The flame cleaning component (8) includes a semi-circular flame tube (83). On both sides of the flame tube (83), air nozzles (87) are respectively installed through. On the side of the flame tube (83) close to the center of the circle, a plurality of air suction holes (810) are arrayed and penetrated. Through the flame tubes (83) in the two flame cleaning components (8), a complete circle is formed, so that the flame ejected from the air nozzles (87) forms a complete flame ring to clean the surface of the repair roller (5). While changing the flame trajectory, the air suction holes (810) adsorb impurities. The magnitude of the air suction 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; On both sides of the flame tube (83), two semi-circular air nozzles (87) are respectively installed through. Inside the air nozzles (87), a flame ejection port (88) is penetrated.

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

3. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 2, characterized in that: On the top of the machine shell part of the machine tool (1), a first driving member is fixedly installed. On the top of the first driving member, a sliding plate is slidably installed. One side of the sliding plate is fixedly connected to the second driving member (6). The second driving member is used to drive the welding torch (7) to move up and down.

4. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 1, characterized in that: The flame cleaning component (8) further includes an air delivery pipe (81). On the side of the air delivery pipe (81) close to the center of the circle, a plurality of L-shaped flame nozzles (82) are installed through. And the output end of the flame nozzle (82) penetrates and is located inside the flame tube (83). On the side of the air delivery pipe (81) far from the center of the circle, a gas port (811) is installed through.

5. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 1, characterized in that: On the side of the flame tube (83) close to the center of the circle, a plurality of limiting plates (84) are arrayed and installed. On the side of the flame tube (83) far from the center of the circle, a plurality of oxygen holes (85) are penetrated, and the oxygen holes (85) are located at the output end position of the flame nozzle (82).

6. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 5, wherein: One end of the flame tube (83) is penetrated with a through hole (86), and the output end of the flame nozzle (82) penetrates the other end of the flame tube (83).

7. The automated welding repair equipment for local defects of cold rolling rolls according to claim 6, characterized in that: Inside the flame tube (83), a partition plate (89) is fixedly installed. The partition plate (89) divides the inside 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 partition plate (89) in the flame tube (83) far from the center of the circle 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 holes (810) communicate with the wind chamber (10). Inside the partition plate (89), two air suction pipes (812) are installed through, and the air suction pipes (812) penetrate the inside of the flame tube (83).

8. The automatic welding repair equipment for local defects of cold rolling rolls according to claim 4, characterized in that: The two sides of the second driving member (6) are respectively penetrated and installed with telescopic members, and the output ends of the telescopic members are fixedly connected with the top of the air delivery pipe (81) through brackets.

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