A positioning cutting device

Abstract

The invention discloses a positioning cutting device, which belongs to the technical field of cutting devices. The device comprises an arc guide plate arranged on the ground through an L-shaped support leg and a flame nozzle slidably arranged on the surface of the arc guide plate through a walking support arm. A walking slide groove is provided at the center of the arc guide plate. A relatively arranged preheating nozzle and a softening nozzle are rotatably arranged on the surface of the flame nozzle. The preheating nozzle and the softening nozzle are closed and wrapped around the surface of the flame nozzle. The preheating nozzle and the softening nozzle are fixedly connected to the side wall of the flame nozzle through a ventilation hose. The invention is provided with a sand storage tank. When the combustion nozzle preheats the cutting point, the abrasive sand inside the sand storage tank enters the flame nozzle through a sand passing pipe. Under the action of high-pressure oxygen and acetylene gas, the abrasive sand hits the cutting point at high speed. The impact force of the abrasive sand is combined with the high temperature of the flame to quickly destroy the surface structure of the steel coil, thereby improving the efficiency of the flame nozzle melting through the steel coil.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting equipment, and in particular to a positioning cutting equipment. Background Art

[0002] Flame cutting is the oldest thermal cutting method. Flame cutting uses the high temperature generated by the combustion of iron oxide to cut carbon steel. The design of the flame cutting torch provides sufficient oxygen for the combustion of iron oxide to ensure good cutting results.

[0003] When existing flame cutting equipment cuts scrap steel coils, it is necessary to preheat the cutting point with a high-temperature flame so that the flame can melt through the scrap steel coils. This process takes a long time. In addition, when cutting steel coils, the flame cutting equipment mainly relies on high temperature to melt the scrap steel coils. High temperature needs to melt the scrap steel coils slowly, resulting in low cutting efficiency. Moreover, high-temperature melting of the scrap steel coils will produce slag, which is easy to adhere to the cutting surface. After the slag cools, it is easy to form a welding effect, making it difficult to separate the scrap steel coils on each layer.

[0004] In addition, during the flame cutting process, the uneven intensity of the airflow on the vertical projection surface causes turbulence and divergence, which will lead to an uneven cutting surface of the scrap steel coil, affecting the subsequent recycling and processing of the scrap steel coil. Therefore, a positioning cutting device is proposed to solve the above problem. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of low cutting efficiency of flame cutting equipment in the prior art, which leads to difficulty in separating the cut steel coils and uneven cutting surface, and to propose a positioning cutting equipment.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A positioning cutting device, comprising an arc-shaped guide plate set on the ground through L-shaped legs and a flame nozzle slidably set on the surface of the arc-shaped guide plate through a walking support arm, a walking slide groove is opened at the center of the arc-shaped guide plate, a preheating nozzle and a softening nozzle arranged opposite to each other are rotatably set on the surface of the flame nozzle, the preheating nozzle and the softening nozzle are closed and wrapped on the surface of the flame nozzle, and the preheating nozzle and the softening nozzle are fixedly connected to the side wall of the flame nozzle through a ventilation hose;

[0008] A sand storage tank is installed on the surface of the walking support arm, the interior of the sand storage tank is filled with abrasive sand, the bottom end of the sand storage tank is fixedly connected to the side wall of the flame nozzle through a sand passing pipe, a control valve is provided on the sand passing pipe, and a closing component connected to the preheating nozzle and the softening nozzle is installed on the side wall of the walking support arm;

[0009] The side wall of the walking support arm is fixedly connected to a V-shaped support frame, one end of the V-shaped support frame is fixedly connected to a telescopic cylinder, the output end of the telescopic cylinder is rotatably connected to a gear column box, an adjusting motor is installed inside the gear column box, and the output end of the adjusting motor is provided with a grinding component for grinding and cutting.

[0010] Preferably, a combustion port is provided on the surface of the arc-shaped guide rail plate, and a guide sliding block fixedly connected to the walking support arm is slidably provided inside the combustion port.

[0011] Preferably, the closing assembly includes a bidirectional cylinder installed on the side wall of the walking support arm and an arc-shaped clamp fixedly connected to the output ends on both sides of the bidirectional cylinder, and a torsion spring is provided at the rotating connection between the preheating nozzle and the softening nozzle and the flame nozzle.

[0012] Preferably, a grinding motor is installed on the inner wall of the V-shaped support frame, and the output end of the grinding motor is fixedly connected to a driving gear meshing with the gear column box.

[0013] Preferably, the grinding assembly includes a screw shaft fixedly connected to the output end of the adjusting motor, a nut block threadedly connected to the surface of the screw shaft, and a transmission rod rotatably connected to the surface of the nut block.

[0014] Preferably, the transmission rods are provided in plurality and are circumferentially distributed on the surface of the nut block, and the other end of the nut block is rotatably connected to a grinding combination plate.

[0015] Preferably, the bottom end of the gear column box is fixedly connected with a circumferentially distributed slide rail, and the inner side of the slide rail is slidably provided with a limit slider fixedly connected to the top end of the grinding combination plate.

[0016] Preferably, the plurality of grinding combination plates are in an arc-shaped plate structure and are closed to each other to form a complete cylindrical structure. The grinding combination plate is composed of a base plate and an abrasive plate. The abrasive plate is arranged on the outer surface of the base plate. A high temperature resistant rubber layer is arranged between the abrasive plate and the base plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This scheme is provided with a sand storage tank. When the combustion nozzle preheats the cutting point, the control valve on the sand tank is opened to allow the abrasive sand inside the sand storage tank to enter the flame nozzle through the sand pipe. Under the action of high-pressure oxygen and acetylene gas, the abrasive sand hits the cutting point at high speed. The impact force of the abrasive sand and the high temperature of the flame can quickly destroy the surface structure of the steel coil, thereby improving the efficiency of the flame nozzle to melt through the steel coil. Similarly, when the flame nozzle cuts the scrap steel coil, the cutting efficiency can also be improved.

[0019] 2. This scheme is provided with a preheating nozzle. By tilting the preheating nozzle, when the flame nozzle cuts the steel coil, the flame ejected from the preheating nozzle can preheat the next cutting point in advance. When the flame nozzle cuts the next cutting point, the melting of the steel coil at the next cutting point can be accelerated, thereby further improving the cutting efficiency of the scrap steel coil.

[0020] 3. This solution is provided with a softening nozzle and a grinding component. The softening nozzle can heat the cut surface and the slag on the cut surface at high temperature, reduce the strength of the cooled slag and the cut surface, and cooperate with the grinding component to grind the cut surface and slag to ensure the flatness of the cut surface while grinding away the slag on the cut surface to avoid the cooled slag welding the cut surface and ensure that the layers of steel coils can be easily separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a positioning cutting device proposed by the present invention;

[0022] Figure 2 A schematic diagram of the structure of a grinding assembly and a flame nozzle in a positioning cutting device proposed by the present invention;

[0023] Figure 3 Schematic diagram of the connection structure of the flame nozzle, the softening nozzle and the preheating nozzle in a positioning cutting device proposed by the present invention Figure 1 ;

[0024] Figure 4 for Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 5 Schematic diagram of the connection structure of the flame nozzle, the softening nozzle and the preheating nozzle in a positioning cutting device proposed by the present invention Figure 2 ;

[0026] Figure 6 A schematic diagram of the structure of a grinding component in a positioning cutting device proposed by the present invention Figure 1 ;

[0027] Figure 7 A schematic diagram of the structure of a grinding component in a positioning cutting device proposed by the present invention Figure 2 ;

[0028] Figure 8 This is a schematic diagram of the assembly structure of a grinding component in a positioning cutting device proposed by the present invention;

[0029] Fig. 9 for Figure 8 The enlarged structural diagram at B in the middle;

[0030] Fig.10 The present invention provides a schematic diagram of the assembly structure of a grinding composite plate in a positioning cutting device.

[0031] In the figure: 1. arc guide plate; 101. walking slide; 102. combustion port; 2. walking support arm; 3. flame nozzle; 301. preheating nozzle; 302. softening nozzle; 4. sand storage tank; 401. sand pipe; 5. grinding combination plate; 501. base plate; 502. abrasive plate; 503. high temperature resistant rubber layer; 6. telescopic cylinder; 7. control valve; 8. ventilation hose; 9. two-way cylinder; 10. arc splint; 11. V-shaped support frame; 12. grinding motor; 13. driving gear; 14. gear column box; 15. slide rail; 16. adjusting motor; 17. screw shaft; 18. transmission rod; 19. nut block. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example, see Figure 1A positioning cutting device includes an arc-shaped guide plate 1 set on the ground through an L-shaped support leg and a flame nozzle 3 slidably set on the surface of the arc-shaped guide plate 1 through a walking support arm 2. Furthermore, a combustion port 102 is opened on the surface of the arc-shaped guide plate 1, and a guide slider fixedly connected to the walking support arm 2 is slidably set on the inner side of the combustion port 102.

[0036] It should be noted that: the staff holds the walking support arm 2 and pushes it to move, and the walking support arm 2 drives the flame nozzle 3 connected thereto to move, ensuring that the flame nozzle 3 can move stably in a straight line, thereby ensuring that the cutting path is a straight line.

[0037] Reference Figure 3 A walking chute 101 is provided at the center of the arc-shaped guide rail plate 1, and a preheating nozzle 301 and a softening nozzle 302 are rotatably provided on the surface of the flame nozzle 3, and the preheating nozzle 301 and the softening nozzle 302 are closed and wrapped around the surface of the flame nozzle 3, and the preheating nozzle 301 and the softening nozzle 302 are fixedly connected to the side wall of the flame nozzle 3 through a ventilation hose 8;

[0038] It should be noted that the oxygen and acetylene gas entering the flame nozzle 3 enter the preheating nozzle 301 and the softening nozzle 302 respectively through the ventilation hose 8.

[0039] Reference Figure 3 to Figure 4 The side wall of the walking support arm 2 is equipped with a closing assembly connected to the preheating nozzle 301 and the softening nozzle 302. Furthermore, the closing assembly includes a bidirectional cylinder 9 installed on the side wall of the walking support arm 2 and an arc-shaped clamping plate 10 fixedly connected to the output ends on both sides of the bidirectional cylinder 9. A torsion spring is provided at the rotating connection between the preheating nozzle 301 and the softening nozzle 302 and the flame nozzle 3.

[0040] It should be noted that: the two-way cylinder 9 is turned on, and the two-way cylinder 9 pushes the arc clamp 10 to move through the output ends on both sides, so that the arc clamp 10 is away from the preheating nozzle 301 and the softening nozzle 302. Under the action of the torsion spring force, the preheating nozzle 301 and the softening nozzle 302 are rotated and away from the flame nozzle 3, so that the preheating nozzle 301 and the softening nozzle 302 are inclined. The inclined preheating nozzle 301 can always point to the next cutting point when moving with the flame nozzle 3, thereby realizing the preheating function of the next cutting point. The softening nozzle 302 can heat the cut surface produced by the cutting of the flame nozzle 3, reduce the strength of the cooled slag and the cut surface, and facilitate the grinding component to grind the cut surface and slag.

[0041] Reference Figure 3A sand storage tank 4 is installed on the surface of the walking support arm 2. The interior of the sand storage tank 4 is filled with abrasive sand. The bottom end of the sand storage tank 4 is fixedly connected to the side wall of the flame nozzle 3 through a sand passing pipe 401. A control valve 7 is provided on the sand passing pipe 401.

[0042] It should be noted that: by opening the control valve 7, the abrasive sand in the sand storage tank 4 enters the flame nozzle 3. Under the impact of high-pressure oxygen and acetylene gas, the abrasive sand hits the cutting point on the surface of the scrap steel coil at high speed, which can play a preliminary role in destroying the surface of the scrap steel coil, so that pits are generated on the surface of the scrap steel coil. The presence of the pits can increase the contact area between the flame and the cutting point on the surface of the steel coil, thereby accelerating the melting speed of the flame at the cutting point of the steel coil. Similarly, when the flame nozzle 3 cuts the scrap steel coil, the cutting efficiency can also be improved.

[0043] It is worth noting that the abrasive sand is made of silicon carbide, which has high temperature resistance and a melting point of 2700°C. After being ejected from the flame nozzle 3, the abrasive sand hits the surface of the steel coil at a high speed, and the flame nozzle 3 is close to the surface of the steel coil, so the contact time between the abrasive sand and the high-temperature flame is very short, which can ensure that the abrasive sand hits the surface of the steel coil before being melted.

[0044] When the flame nozzle 3 cuts the steel coil, the flame sprayed from the preheating nozzle 301 can preheat the next cutting point in advance. When the flame nozzle 3 cuts the next cutting point, the melting of the steel coil at the next cutting point can be accelerated by the flame nozzle 3, thereby further improving the cutting efficiency of the scrap steel coil.

[0045] The side wall of the walking support arm 2 is fixedly connected to a V-shaped support frame 11, one end of the V-shaped support frame 11 is fixedly connected to a telescopic cylinder 6, the output end of the telescopic cylinder 6 is rotatably connected to a gear column box 14, an adjusting motor 16 is installed inside the gear column box 14, and the output end of the adjusting motor 16 is provided with a grinding component for grinding and cutting.

[0046] It is worth noting that the length of the gear column box 14 is much greater than the thickness of the driving gear 13, so as to ensure that the gear column box 14 is always meshed with the driving gear 13 during the movement.

[0047] Reference Figures 6 to 9Furthermore, a grinding motor 12 is installed on the inner wall of the V-shaped support frame 11, and the output end of the grinding motor 12 is fixedly connected to a driving gear 13 meshing with the gear column box 14. The grinding assembly includes a screw shaft 17 fixedly connected to the output end of the adjusting motor 16, a nut block 19 threadedly connected to the surface of the screw shaft 17, and a transmission rod 18 rotatably connected to the surface of the nut block 19. The transmission rod 18 is provided with multiple and circumferentially distributed on the surface of the nut block 19. The other end of the nut block 19 is rotatably connected to a grinding combination plate 5. The multiple grinding combination plates 5 are in an arc-shaped plate structure and are closed to each other to form a complete column structure, which makes it easy for the grinding assembly to enter a finer slit, so that the grinding assembly can grind the metal surface (cut surface) inside the slits of different widths.

[0048] Reference Fig.10 Furthermore, the grinding combination plate 5 is composed of a substrate 501 and an abrasive plate 502, and a high temperature resistant rubber layer 503 is arranged between the abrasive plate 502 and the substrate 501, so that when the abrasive plate 502 contacts the cut surface, the abrasive plate 502 will squeeze the high temperature resistant rubber layer 503, so that there is always an extrusion force between the abrasive plate 502 and the cut surface, ensuring the normal progress of the grinding operation.

[0049] It is worth noting that the high temperature resistant rubber layer 503 is disposed near the top of the substrate 501 and the abrasive plate 502, namely, at the end away from the cut, to prevent the high temperature resistant rubber layer 503 from softening due to the high temperature at the cut surface.

[0050] It should be noted that the softening nozzle 302 can heat the cut surface and the slag on the cut surface at high temperature, and the telescopic cylinder 6 is turned on. The output end of the telescopic cylinder 6 extends and pushes the gear column box 14 to move. The gear column box 14 drives the slide rail 15 fixed at its bottom end to move, and the slide rail 15 drives the grinding assembly plate 5 slidably connected thereto to move, so that the grinding assembly plate 5 moves to the inside of the cutting seam, so that the cut surface can be ground.

[0051] According to the size of the cutting seam to be polished, the inner diameter of the polishing composite plate 5 is adjusted to ensure that the polishing composite plate 5 can contact the metal surfaces on both sides of the cutting seam, specifically: the adjusting motor 16 is turned on to drive the screw shaft 17 to rotate, so that the nut block 19 on the surface of the screw shaft 17 moves, and the nut block 19 drives one end of the transmission rod 18 rotatably connected thereto to move, and under the action of the rotational connection between the transmission rod 18 and the polishing composite plate 5, the other end of the transmission rod 18 can push the polishing composite plate 5 to move, so that the inner diameters of the multiple polishing composite plates 5 are adjusted to ensure that the polishing composite plates 5 can contact the metal surfaces on both sides of the cutting seam;

[0052] Turn on the grinding motor 12, which drives the driving gear 13 at its output end to rotate, and the driving gear 13 drives the gear column box 14 meshing therewith to rotate, and the gear column box 14 drives the slide rail 15 fixed at its bottom end to rotate, and the slide rail 15 drives the grinding combination plate 5 to rotate, thereby realizing the grinding function of the cut surface and slag, ensuring the flatness of the cut surface while avoiding slag cooling the welded cut surface, and ensuring that each layer of steel coils can be easily separated.

[0053] Furthermore, the bottom end of the gear column box 14 is fixedly connected with a circumferentially distributed slide rail 15 , and a limit slider fixedly connected to the top end of the grinding combination plate 5 is slidably provided on the inner side of the slide rail 15 .

[0054] It should be noted that the limiting slider cooperates with the slide rail 15 so that the grinding assembly plate 5 can only move horizontally, so that the transmission rod 18 can push the grinding assembly plate 5 to move.

[0055] The present invention makes the arc-shaped guide plate 1 fit the surface of the scrap steel coil to be cut, so that the flame nozzle 3 is directly opposite to the cutting point. After the oxygen and acetylene in the flame cutting equipment are distributed and introduced into the flame nozzle 3 (the distribution of oxygen and acetylene in the flame cutting equipment is a prior art and will not be repeated here, and how the oxygen and acetylene gas enter the flame nozzle 3 is a prior art and will not be repeated here), the oxygen and acetylene gas in the flame nozzle 3 will enter the preheating nozzle 301 and the softening nozzle 302 respectively through the ventilation hose 8, and then the flame nozzle 3, the preheating nozzle 301 and the softening nozzle 302 are ignited (the ignition method is generally to ignite by aiming a lighter at the nozzle, which is a prior art and will not be repeated here), and the ejected flame passes through the combustion port 102 to contact the cutting point on the surface of the scrap steel coil;

[0056] Then, the control valve 7 is opened, so that the abrasive sand in the sand storage tank 4 enters the flame nozzle 3 through the sand pipe 401 (the rate at which the abrasive sand enters the flame nozzle 3 can be controlled by the control valve 7, similar to an hourglass, so that the amount of abrasive sand entering the flame nozzle 3 each time will not block the mouth of the flame nozzle 3). Under the action of the high-speed airflow formed by the high-pressure oxygen and acetylene gas, a large amount of abrasive material passes through the mouth of the flame nozzle 3 and hits the cutting point at high speed, which can initially damage the cutting point of the scrap steel coil, so that a large number of pits are generated at the cutting point on the surface of the scrap steel coil. The presence of the pits can significantly increase the contact area between the flame and the cutting point. At the same time, under the continuous high-speed impact of the abrasive sand, the melting speed of the flame at the cutting point of the steel coil can be accelerated. Similarly, when the flame nozzle 3 cuts the scrap steel coil, the cutting efficiency can also be improved.

[0057] When the flame nozzle 3 cuts the cutting point, the bidirectional cylinder 9 is turned on, and the bidirectional cylinder 9 pushes the arc clamping plate 10 to move through the output ends on both sides, so that the arc clamping plate 10 is away from the preheating nozzle 301 and the softening nozzle 302. Under the action of the torsion spring force, the preheating nozzle 301 and the softening nozzle 302 rotate and move away from the flame nozzle 3, so that the preheating nozzle 301 and the softening nozzle 302 are inclined;

[0058] The inclined preheating nozzle 301 can preheat the next cutting point. When the flame nozzle 3 moves to the next cutting point, the next cutting point can be quickly heated to the melting temperature, further improving the cutting efficiency of the scrap steel coil.

[0059] The inclined softening nozzle 302 can heat the cut surface and the slag on the cut surface at high temperature, reduce the strength of the slag and the cut surface after cooling, turn on the telescopic cylinder 6, the output end of the telescopic cylinder 6 extends and pushes the gear column box 14 to move, the gear column box 14 drives the slide rail 15 fixed at its bottom end to move, the slide rail 15 drives the grinding assembly plate 5 slidably connected thereto to move, so that the grinding assembly plate 5 moves to the inside of the cutting seam;

[0060] Then, the adjusting motor 16 is turned on, and the adjusting motor 16 drives the screw shaft 17 to rotate, so that the nut block 19 on the surface of the screw shaft 17 moves, and the nut block 19 drives one end of the transmission rod 18 rotatably connected thereto to move. Under the action of the rotational connection between the transmission rod 18 and the grinding combination plate 5, the other end of the transmission rod 18 can push the grinding combination plate 5 to move along the slide rail 15, so that the grinding combination plate 5 contacts the cut surface, and the grinding motor 12 is turned on. The grinding motor 12 drives the driving gear 13 at its output end to rotate, and the driving gear 13 drives the gear column box 14 meshing therewith to rotate, and the gear column box 14 drives the slide rail 15 fixed at its bottom end to rotate, and the slide rail 15 drives the grinding combination plate 5 to rotate. The high-speed rotating grinding combination plate 5 can realize the grinding function of the metal surfaces and slag on both sides of the cutting seam during the rotation process, and at the same time ensure the flatness of the cut surface, grind off the slag on the cut surface, avoid the cooled slag welding cut surface, and ensure that the layers of steel coils can be easily separated.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A positioning cutting device, comprising an arc-shaped guide plate (1) arranged on the ground via L-shaped legs and a flame nozzle (3) slidably arranged on the surface of the arc-shaped guide plate (1) via a walking support arm (2), characterized in that: A walking slide groove (101) is provided at the center of the arc-shaped guide rail plate (1); a preheating nozzle (301) and a softening nozzle (302) are rotatably provided on the surface of the flame nozzle (3) and are relatively arranged; the preheating nozzle (301) and the softening nozzle (302) are closed and wrapped around the surface of the flame nozzle (3); and the preheating nozzle (301) and the softening nozzle (302) are fixedly connected to the side wall of the flame nozzle (3) via a ventilation hose (8); A sand storage tank (4) is installed on the surface of the walking support arm (2), the interior of the sand storage tank (4) is filled with abrasive sand, the bottom end of the sand storage tank (4) is fixedly connected to the side wall of the flame nozzle (3) via a sand passing pipe (401), the sand passing pipe (401) is provided with a control valve (7), and a closing component connected to the preheating nozzle (301) and the softening nozzle (302) is installed on the side wall of the walking support arm (2); The side wall of the walking support arm (2) is fixedly connected to a V-shaped support frame (11), one end of the V-shaped support frame (11) is fixedly connected to a telescopic cylinder (6), the output end of the telescopic cylinder (6) is rotatably connected to a gear column box (14), an adjusting motor (16) is installed inside the gear column box (14), and the output end of the adjusting motor (16) is provided with a grinding component for grinding and cutting; A grinding motor (12) is installed on the inner wall of the V-shaped support frame (11), and an output end of the grinding motor (12) is fixedly connected to a driving gear (13) meshing with a gear column box (14); The closing assembly comprises a bidirectional cylinder (9) mounted on the side wall of the walking support arm (2) and an arc-shaped clamping plate (10) fixedly connected to the output ends on both sides of the bidirectional cylinder (9); a torsion spring is provided at the rotational connection between the preheating nozzle (301) and the softening nozzle (302) and the flame nozzle (3); when the bidirectional cylinder (9) is opened, the bidirectional cylinder (9) pushes the arc-shaped clamping plate (10) to move through the output ends on both sides, so that the arc-shaped clamping plate (10) is away from the preheating nozzle (301) and the softening nozzle (302); Under the action, the preheating nozzle (301) and the softening nozzle (302) are rotated and moved away from the flame nozzle (3), so that the preheating nozzle (301) and the softening nozzle (302) are inclined. When the inclined preheating nozzle (301) moves with the flame nozzle (3), it always points to the next cutting point, thereby realizing the preheating function of the next cutting point. The softening nozzle (302) heats the cut surface produced by the flame nozzle (3) after cutting, thereby reducing the strength of the slag and the cut surface after cooling, thereby facilitating the grinding component to grind the cut surface and the slag.

2. A positioning cutting device according to claim 1, characterized in that: A combustion port (102) is provided on the surface of the arc-shaped guide rail plate (1), and a guide sliding block fixedly connected to the walking support arm (2) is slidably provided inside the combustion port (102).

3. A positioning cutting device according to claim 1, characterized in that: The grinding assembly comprises a screw shaft (17) fixedly connected to the output end of the adjusting motor (16), a nut block (19) threadedly connected to the surface of the screw shaft (17), and a transmission rod (18) rotatably connected to the surface of the nut block (19).

4. A positioning cutting device according to claim 3, characterized in that: The transmission rods (18) are provided in plurality and are circumferentially distributed on the surface of the nut block (19); the other end of the nut block (19) is rotatably connected to a grinding assembly plate (5).

5. A positioning cutting device according to claim 4, characterized in that: The bottom end of the gear column box (14) is fixedly connected to a circumferentially distributed slide rail (15), and a limit slider fixedly connected to the top end of the grinding assembly plate (5) is slidably provided inside the slide rail (15).

6. A positioning cutting device according to claim 4, characterized in that: The plurality of grinding assembly plates (5) are in an arc-shaped plate structure and are closed to each other to form a complete cylindrical structure. The grinding assembly plates (5) are composed of a base plate (501) and an abrasive plate (502). The abrasive plate (502) is arranged on the outer surface of the base plate (501), and a high-temperature resistant rubber layer (503) is arranged between the abrasive plate (502) and the base plate (501).

Images