A seamless steel pipe cutting device

Abstract

The invention relates to the technical field of seamless steel pipe processing, and discloses a seamless steel pipe cutting device; it comprises a cutting assembly capable of cutting the seamless steel pipe from the inside to the outside, an internal clamping assembly for limiting the position of the cutting assembly in the axial direction of the seamless steel pipe, and a fracture butt holding assembly covering the outer side of the middle part of the seamless steel pipe; the cutting assembly comprises an I-shaped slide seat, on which a cutting disc is rotatably mounted; the fracture butt holding assembly comprises a Ji-shaped cover, on the side of which a cold air injection pipe is provided, and the middle part of the Ji-shaped cover corresponds to the middle position of the cutting disc; the application cuts the seamless steel pipe from the inside to the outside, and shields and cools the cut-off part from the outside of the steel pipe, thereby avoiding irregular deformation at the fracture of the seamless steel pipe, realizing operation without open flames, improving the safety of the operation of the device, and collecting the debris generated during the cutting process, thereby avoiding adverse effects on the cleanliness of the inside of the seamless steel pipe.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe processing, in particular to a seamless steel pipe cutting device. Background Art

[0002] In the processing of seamless steel pipes, especially in the cutting process, it is very important to strictly abide by the operating procedures; this includes using professional cutting equipment, setting appropriate process parameters, and regularly cleaning and maintaining tools to avoid impurities generated during the cutting process from contaminating the surface of the pipe, thereby causing unnecessary oxidation or damage;

[0003] The existing application number is CN202211368352.3, which discloses a steel pipe cutting machine. The patent document discloses a method of using a linkage belt that can be dynamically deformed to drive the steel pipe to rotate during the transportation process after cutting, and to clean the outer side of the cut steel pipe. Specifically, the first linkage protrusion and the second linkage protrusion alternately pull the two ends of the linkage belt, so that the linkage belt can achieve horizontal reciprocating movement. Since the lower side of the linkage belt fits the upper surface of the small section of the pipe, the small section of the pipe is driven to achieve horizontal rolling in the first transfer channel plate through its friction while the linkage belt moves horizontally. When the surface of the small section of the pipe is flushed with a flushing pipe, the linkage belt can drive the pipe to roll, ensuring that the outer surface of the pipe can be flushed all around, avoiding the residue of debris.

[0004] When using the technical solution in the above-mentioned patent document, since the cleaning liquid is applied to the steel pipe after the steel pipe is cut, and the temperature of the steel pipe at the fracture after cutting is relatively high, when the water flow acts on the fracture of the steel pipe, the temperature at the fracture of the steel pipe drops suddenly, which can easily cause local deformation of the steel pipe; in addition, under the action of the water flow, the debris remaining from the cutting of the steel pipe will flow deep into the inside of the steel pipe, affecting the cleanliness of the inside of the steel pipe. Therefore, the present application provides a seamless steel pipe cutting device. Summary of the invention

[0005] In order to solve the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a seamless steel pipe cutting device, which cuts the seamless steel pipe from the inside to the outside, and shields and cools the cut end from the outside of the steel pipe, thereby avoiding irregular deformation at the fracture of the seamless steel pipe, achieving flame-free operation, improving the safety of the device operation, and collecting the debris generated during the cutting process to avoid adverse effects on the cleanliness of the inside of the seamless steel pipe.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] Provided is a seamless steel pipe cutting device, comprising an inner clamping assembly and a cutting assembly; the cutting assembly comprises an I-shaped slide seat, the I-shaped slide seat is located on the inner side of the seamless steel pipe and can slide along the radial direction of the seamless steel pipe, a cutting disc and a rotating driver for driving the cutting disc to rotate are installed on the I-shaped slide seat; the inner clamping assembly comprises a plurality of positioning rings, the plurality of positioning rings are distributed to different positions on the inner side of the seamless steel pipe along the axial direction of the seamless steel pipe, a rotating disc and a tightening air bag are respectively arranged on the inner and outer sides of the positioning ring, the rotating disc is rotatably installed in the positioning ring, the outer side surface of the tightening air bag can fit with the inner side surface of the seamless steel pipe, and the plurality of rotating discs are connected together by guide rods; the I-shaped slide seat is installed on a rotating disc located at an edge, a linear electric cylinder for driving the I-shaped slide seat to slide is installed on the rotating disc, the cutting disc is located between the two rotating discs, a U-shaped cover is fixedly installed on the positioning ring on the outer side of the rotating disc located at the other edge, and the U-shaped cover covers the outer side of the end of the seamless steel pipe; the outer side of the middle part of the seamless steel pipe is covered with a fracture butt holding assembly.

[0008] Furthermore, the fracture butt-jointed retaining assembly includes a U-shaped cover, the side of which is connected to a plurality of cold air injection pipes, the middle of the U-shaped cover corresponds to the middle position of the cutting disc; the U-shaped cover and the U-shaped cover are respectively tightened against the outer side surface of the seamless steel pipe through a plurality of clamping assemblies.

[0009] Furthermore, the clamping assembly includes a chuck, and multiple chucks are respectively slidably connected to the U-shaped cover and the F-shaped cover. Elastic pads and adjusting studs are respectively provided on both sides of the chuck. The elastic pads can abut against the outer side surface of the seamless steel pipe. The adjusting studs are rotatably connected to the chuck and are engaged with the U-shaped cover or the F-shaped cover through threaded threads.

[0010] Furthermore, the wall thickness of the F-shaped cover is uniform, and a protruding structure extending in a direction away from the outer wall of the seamless steel pipe 1 is provided in the middle of the F-shaped cover, and the protruding structure forms a cold air circulation groove on the inner side of the middle of the F-shaped cover, and the bottom of the F-shaped cover is connected to an exhaust and slag discharge pipe; wherein the exhaust and slag discharge pipe and multiple cold air injection pipes are all arranged at the protruding structure in the middle of the F-shaped cover.

[0011] Furthermore, the guide rod is composed of a plurality of spliced ​​rod members, the ends of adjacent spliced ​​rod members are embedded in each other and locked in relative position by means of latches, the turntable located in the middle of the inner side of the seamless steel pipe is fixedly connected to the spliced ​​rod members, and the turntable located at the end of the seamless steel pipe is detachably connected to the spliced ​​rod members by means of fasteners; the guide rod is detachably connected to a handle I at one end located on the outer side of the seamless steel pipe.

[0012] Furthermore, the tightening airbag is annular in structure, and a plurality of spacers are arranged on the inner side of the tightening airbag, which divide the interior of the tightening airbag into a plurality of independent inflatable cavities. The ends of the tightening airbag are fixedly connected and connected to the positions of the independent inflatable cavities, and an air pipe is arranged thereon, which passes through the positioning ring and extends toward the outer side of the end of the positioning ring.

[0013] Furthermore, the air pipe is connected to the exhaust pipe and the air injection pipe through a three-way joint, the exhaust pipe and the air injection pipe are respectively installed with valve I and valve II, and the air injection pipe is connected to the high-pressure gas tank.

[0014] Furthermore, the clamping assembly also includes two elastic rings arranged in the cold air circulation groove, the ends of the elastic rings are in contact with the inner side surfaces of the cold air circulation groove, and the inner side surfaces of the elastic rings are in contact with the outer side surfaces of the seamless steel pipe.

[0015] Furthermore, the elastic ring includes an inner elastic ring and an outer elastic ring, the inner elastic ring is connected to a correspondingly positioned chuck via a plurality of connecting rods, the outer elastic ring is sleeved on the outer side of the inner elastic ring, the end of the outer elastic ring abuts against the inner side surface of the cold air circulation groove, and the inner side surface of the outer elastic ring fits against the outer side surface of the seamless steel pipe.

[0016] Furthermore, a plurality of shrinkage seams are arranged on the inner edge of the outer elastic ring. When the plurality of shrinkage seams are in a contracted state, the inner side surface of the outer elastic ring abuts against the outer side surfaces of seamless steel pipes of different diameters.

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

[0018] 1. The seamless steel pipe cutting device of the example of the present invention, the inner clamping assembly and the cutting assembly can penetrate into the inner side of the seamless steel pipe to perform cutting operations, which reduces the overall volume of the device compared with the prior art; combined with the use of a fracture butt holding assembly and a plurality of tightening air bags, the inner and outer sides of the cut portion of the seamless steel pipe are sealed respectively, thereby achieving operations without open flames and improving the safety of the device operation.

[0019] 2. The seamless steel pipe cutting device of the example of the present invention uses an internal clamping component to position the cutting component and adjust the cut-off position of the seamless steel pipe; as the I-shaped slide slides on the turntable and multiple turntables rotate relative to their respective corresponding positioning rings, the cutting disc is controlled to perform all-round cutting of the seamless steel pipe from the inside to the outside. During this process, cold air is injected into multiple cold air injection pipes to cool the seamless steel pipe during the cutting process, thereby avoiding irregular deformation at the fracture of the seamless steel pipe.

[0020] 3. In the seamless steel pipe cutting device of the example of the present invention, since the spacer divides the interior of the tightening airbag into multiple independent inflation cavities, when using a high-pressure gas tank to inflate each independent air pipe, the tightening force applied by each position of the outer side of the tightening airbag to the inner side of the seamless steel pipe is balanced and stable; in addition, combined with the use of a U-shaped cover, it is ensured that multiple turntables and the seamless steel pipe are in a center-aligned state, ensuring the continuous cutting operation of the cutting disc, and the device has high stability in use.

[0021] 4. In the seamless steel pipe cutting device of the example of the present invention, cold air flows along the cold air circulation groove around the outer side of the seamless steel pipe cut-off position, driving the debris generated by the steel pipe cutting to be discharged to the exhaust and slag discharge pipe, which can effectively avoid local deformation of the steel pipe during the cutting process, avoid irregular deformation at the fracture of the seamless steel pipe, and collect the debris generated in the cutting process to avoid adverse effects on the cleanliness of the inside of the seamless steel pipe.

[0022] 5. The seamless steel pipe cutting device of the example of the present invention, after the seamless steel pipe is cut off, still uses multiple clamping components on the shaped cover to clamp the two ends of the cut portion of the seamless steel pipe, continuously cools the cut portion of the seamless steel pipe and collects debris; avoids premature bending of the seamless steel pipe due to its own weight when it is not completely cut off, avoids collision damage caused by falling of the seamless steel pipe that has not been completely cooled, reduces the demand for pipeline support, and is conducive to aerial operations.

[0023] 6. The seamless steel pipe cutting device of the example of the present invention uses an inner clamping component to intercept the debris flying from the inner side of the seamless steel pipe, and uses a fracture butt holding component to intercept the debris flying from the outer side of the seamless steel pipe, thereby avoiding the splashing of debris generated during the cutting process of the seamless steel pipe, facilitating the subsequent collection and discharge, maintaining the cleanliness of the inside and outside of the seamless steel pipe, and achieving good use effect.

[0024] 7. In the example of the seamless steel pipe cutting device of the present invention, the elastic modulus of the inner elastic ring is greater than the elastic modulus of the outer elastic ring, so that the overall shape of the elastic ring maintains a stable annular structure, and as the multiple chucks on the shaped cover converge toward the center of the seamless steel pipe, the multiple shrinkage seams are closed, and the debris generated during the pipe cutting process is firmly confined between the shaped cover and the seamless steel pipe; wherein the inner elastic ring and the outer elastic ring can be deformed together with the convergence of the multiple chucks, so that the fracture butt-jointed retaining assembly can be easily installed and disassembled on the outside of the seamless steel pipe.

[0025] 8. In the seamless steel pipe cutting device of the example of the present invention, the adjusting stud is rotatably connected to the chuck and is engaged with the U-shaped cover or the polygonal cover by threaded engagement. The adjusting stud is rotated to control the multiple chucks to close or open toward the center of the seamless steel pipe, so as to adapt to the use of seamless steel pipes with different outer diameters. The amount of air filled into the tightening airbag is changed to make the tightening airbag expand or contract, so as to adapt to the use of seamless steel pipes with different inner diameters, and the device has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 A schematic diagram of the overall structure of the seamless steel pipe cutting device provided in an embodiment of the present invention;

[0028] Figure 2 A cross-sectional view of the entire seamless steel pipe cutting device provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of a turntable, an I-shaped slide and a cutting disc provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a seamless steel pipe, a cutting disc, an inner elastic ring and an inner elastic ring provided in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the structure of a guide rod and a plurality of rotating disks provided in an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the structure of the guide rod, the rotating disk and the U-shaped cover provided in an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the structure of a rotating disk and a cutting disc provided in an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of the structure of a tightening airbag and a spacer provided in an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of the structure of a shaped cover, a cold air injection pipe, a chuck and an adjusting stud provided in an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of the structure of an inner elastic ring and a shrinkage seam provided in an embodiment of the present invention;

[0037] Fig.11 This is a schematic structural diagram of an inner elastic ring and a connecting rod provided in an embodiment of the present invention.

[0038] In the figure: 1 seamless steel pipe, 11 guide rod, 12 handle I, 2 inner clamping assembly, 21 turntable, 22 positioning ring, 23 tightening airbag, 231 air pipe, 232 spacer, 24 handle II, 3 cutting assembly, 31 I-shaped slide, 32 motor, 33 cutting disc, 34 linear electric cylinder, 4 U-shaped cover, 5 fracture butt holding assembly, 51 Ji-shaped cover, 52 cold air injection pipe, 6 clamping assembly, 61 chuck, 62 elastic pad, 63 adjusting stud, 64 inner elastic ring, 65 connecting rod, 66 outer elastic ring, 67 shrinkage seam. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0040] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0041] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0045] Embodiment 1:

[0046] like Figure 1-7 As shown, this embodiment provides a seamless steel pipe cutting device, including an inner clamping component 2 and a cutting component 3; the cutting component 3 includes an I-shaped slide 31, the I-shaped slide 31 is located on the inner side of the seamless steel pipe 1 and can slide along the radial direction of the seamless steel pipe 1, and a cutting disc 33 and a rotating driver 32 for driving the cutting disc 33 to rotate are installed on the I-shaped slide 31; the rotating driver 32 can use a low-speed, high-torque motor or hydraulic motor that can be purchased on the market.

[0047] like Figure 2-3 and Figure 5-7 As shown, the inner clamping assembly 2 includes a plurality of positioning rings 22, and the plurality of positioning rings 22 are distributed to different positions on the inner side of the seamless steel pipe 1 along the axial direction of the seamless steel pipe 1, and a turntable 21 and a tightening airbag 23 are respectively provided on the inner and outer sides of the positioning ring 22. The tightening airbag 23 is annular in structure, and the inner side surface of the tightening airbag 23 is fixedly connected to the positioning ring 22. The turntable 21 is rotatably installed in the positioning ring 22, and the outer side surface of the tightening airbag 23 can fit with the inner side surface of the seamless steel pipe 1, and the plurality of turntables 21 are connected together by a guide rod 11.

[0048] The air pipe 231 is connected with the exhaust pipe and the air injection pipe through a three-way joint. The exhaust pipe and the air injection pipe are respectively installed with valves I and II. The air injection pipe is connected with the high-pressure gas tank. By changing the amount of air filled into the tightening airbag 23, the tightening airbag 23 can be expanded or contracted to adapt to the use of seamless steel pipes 1 with different inner diameters.

[0049] Among them, valve I and valve II can use wireless control valves or Internet of Things electric valves that can be purchased on the market.

[0050] like Figure 2-3 , Figure 5 and Figure 7 As shown, the I-shaped slide 31 is installed on a turntable 21 located at the edge, and a linear electric cylinder 34 for driving the I-shaped slide 31 to slide is installed on the turntable 21, and a handle II 24 is fixedly installed on the turntable 21 near the end of the seamless steel pipe 1.

[0051] like Figure 1-2 and Figure 5As shown, the guide rod 11 is composed of a plurality of spliced ​​rods, the ends of adjacent spliced ​​rods are embedded in each other and locked in relative position by means of latches, thereby increasing the number of spliced ​​rods and the length of the spliced ​​rods inserted into the seamless steel pipe 1, and adjusting the cutting position of the seamless steel pipe 1; the turntable 21 located in the middle of the inner side of the seamless steel pipe 1 is fixedly connected to the spliced ​​rods, and the turntable 21 located at the end of the seamless steel pipe 1 is detachably connected to the spliced ​​rods by fasteners.

[0052] like Figure 1-2 As shown, one end of the guide rod 11 located outside the seamless steel pipe 1 is detachably connected to a handle Ⅰ12 so as to control the synchronous rotation of multiple guide rods 11 and multiple turntables 21.

[0053] like Figure 2 , Figure 5 and Figure 7 As shown, the cutting disc 33 is located between the two turntables 21, and a U-shaped cover 4 is fixedly installed on the positioning ring 22 on the outside of the turntable 21 located at the other edge. The U-shaped cover 4 covers the outside of the end of the seamless steel pipe 1, and the middle outside of the seamless steel pipe 1 is covered with a fracture butt retaining assembly 5; because the inner side surface of the U-shaped cover 4 is in a state of being in contact with the outer side surface of the seamless steel pipe 1, the turntable 21 connected to the inner side of the U-shaped cover 4 is aligned with the center of the seamless steel pipe 1.

[0054] like Figure 1-2 and Fig. 9 As shown, the fracture butt-jointing retaining assembly 5 includes a U-shaped cover 51, and the side of the U-shaped cover 51 is connected to a plurality of cold air injection pipes 52, and the middle of the U-shaped cover 51 corresponds to the middle position of the cutting disc 33; the U-shaped cover 4 and the U-shaped cover 51 are respectively pressed against the outer side surface of the seamless steel pipe 1 through a plurality of clamping assemblies 6; cold air is injected into the plurality of cold air injection pipes 52 for cooling treatment to avoid irregular deformation at the fracture of the seamless steel pipe 1.

[0055] When the seamless steel pipe cutting device of the present application is used to cut the seamless steel pipe 1:

[0056] Step 1: Hold the handle I 12 and the handle II 24, insert the guide rod 11, the inner clamping assembly 2 and the cutting assembly 3 into the inner side of the seamless steel pipe 1, adjust the position of the guide rod 11 on the turntable 21 at the end, and determine the cutting length of the seamless steel pipe 1; install the U-shaped cover 4 and the I-shaped cover 51 on the outer side of the end and the outer side of the middle of the seamless steel pipe 1 respectively, so as to intercept the debris splashed on the outer side of the seamless steel pipe 1 during the subsequent cutting process of the seamless steel pipe 1;

[0057] Step 2: Open multiple valves II, so that the gas in the high-pressure gas tank enters the tightening airbag 23 through the air pipe 231, and the tightening airbag 23 expands and bulges until the outer side surface of the tightening airbag 23 is pressed against the inner side surface of the seamless steel pipe 1, so as to intercept the debris splashed on the inner side of the seamless steel pipe 1 during the subsequent cutting process of the seamless steel pipe 1;

[0058] Step three: Hold the handle II 24 to control the multiple turntables 21 to rotate synchronously in their respective corresponding positioning rings 22. During this process, start the rotation driver 32 and the linear electric cylinder 34, control the cutting disc 33 to rotate at high speed, and control the I-shaped slide 31 to slide along the radial direction of the seamless steel pipe 1, so that the cutting disc 33 cuts the seamless steel pipe 1 from the inside to the outside in all directions. During this process, inject cold air into the multiple cold air injection pipes 52 to cool the seamless steel pipe 1 during the cutting process to avoid irregular deformation at the fracture of the seamless steel pipe.

[0059] In step one, since the inner clamping component 2 and the cutting component 3 can penetrate into the inner side of the seamless steel pipe 1 to perform the cutting operation, the overall volume of the device is reduced compared with the prior art; in addition, the fracture butt-jointing retaining component 5 and multiple tightening air bags 23 are used in combination to seal the inner and outer sides of the cut portion of the seamless steel pipe 1 respectively, thereby achieving open flame-free operation and improving the safety of the device operation.

[0060] In step three, after the seamless steel pipe 1 is cut off, the multiple clamping components 6 on the polygonal cover 51 are still used to clamp the two ends of the cut portion of the seamless steel pipe 1, and the cut portion of the seamless steel pipe 1 is continuously cooled and the debris is collected; this avoids premature bending of the seamless steel pipe 1 due to its own weight when it is not completely cut off, and avoids collision damage caused by falling of the seamless steel pipe 1 that has not been completely cooled, thereby reducing the demand for pipeline support and facilitating aerial operations.

[0061] In order to improve the tightening stability of the tightening airbag 23 on the seamless steel pipe 1, Figure 8 As shown, a plurality of spacers 232 are arranged on the inner side of the tightening airbag 23, and the interior of the tightening airbag 23 is divided into a plurality of independent inflatable cavities by the spacers 232. The ends of the tightening airbag 23 are fixedly connected and connected to the positions of the independent inflatable cavities, and an air pipe 231 is arranged thereon. The air pipe 231 penetrates the positioning ring 22 and extends toward the outer side of the end of the positioning ring 22. When a high-pressure gas cylinder is used to inflate the independent air pipes 231, the tightening force applied by each position on the outer side of the tightening airbag 23 to the inner side of the seamless steel pipe 1 is balanced and stable, thereby improving the tightening stability of the tightening airbag 23 on the seamless steel pipe 1.

[0062] The above solution is used in combination with the U-shaped cover 4 to ensure that the multiple turntables 21 are in a center-aligned state with the seamless steel pipe 1, ensuring the continuous cutting operation of the cutting disc 33, and the device has high stability in use.

[0063] In order to improve the cooling effect of cold air on the outer side of the seamless steel pipe 1, Figure 1-2 and Fig. 9 As shown, the F-shaped cover 51 is set to a structure with uniform wall thickness, and a protrusion structure extending in a direction away from the outer wall of the seamless steel pipe 1 is set in the middle of the F-shaped cover 51, so that the protrusion structure forms a cold air flow groove on the inner side of the middle of the F-shaped cover 51, and an exhaust and slag discharge pipe is set at the bottom of the F-shaped cover 51; wherein the exhaust and slag discharge pipe and multiple cold air injection pipes 52 are all set at the protrusion structure in the middle of the F-shaped cover 51; thereby, the cold air can flow along the cold air flow groove around the outer side of the cut-off position of the seamless steel pipe 1, driving the debris generated by the steel pipe cutting to be discharged to the exhaust and slag discharge pipe;

[0064] The use of the above scheme can effectively avoid local deformation of the steel pipe during the cutting process, avoid irregular deformation at the fracture of the seamless steel pipe, and collect the debris generated during the cutting process to avoid adverse effects on the cleanliness of the inside of the seamless steel pipe.

[0065] In this embodiment, the inner side surfaces of the U-shaped cover 4 and the F-shaped cover 51 are in contact with the outer side surfaces of the seamless steel pipe 1, and the U-shaped cover 4 and the F-shaped cover 51 can be composed of two semicircular covers spliced ​​in reverse; the clamping assembly 6 is a fastener, such as a stud with a rubber pad attached to the end.

[0066] Embodiment 2:

[0067] The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 1-2 , Figure 6 and Fig. 9 As shown, in this embodiment, the clamping assembly 6 includes a chuck 61, and a plurality of chucks 61 are respectively slidably connected to the U-shaped cover 4 and the F-shaped cover 51. Elastic pads 62 and adjusting studs 63 are respectively provided on both sides of the chuck 61. The elastic pads 62 can abut against the outer side surface of the seamless steel pipe 1. The adjusting studs 63 are rotatably connected to the chuck 61 and are engaged with the U-shaped cover 4 or the F-shaped cover 51 through threaded engagement.

[0068] The adjusting stud 63 is rotated to control the multiple clamps 61 to close or open toward the center of the seamless steel pipe 1, so as to adapt to the use of seamless steel pipes 1 with different outer diameters.

[0069] In order to improve the operational convenience of aligning the U-shaped cover 4 and the fracture butt-jointed holding component 5 with the center of the seamless steel pipe 1, multiple motors are respectively installed on the outer sides of the U-shaped cover 4 and the fracture butt-jointed holding component 5, and the motors are detachably installed on the U-shaped cover 4 and the fracture butt-jointed holding component 5 through brackets. A polygonal sleeve is connected to the output shaft of the motor, and the polygonal sleeve is plug-in and slidingly connected to the adjusting stud 63; multiple motors are started at the same time to drive the chuck 61 to slide synchronously, thereby improving the operational convenience of aligning the U-shaped cover 4 and the fracture butt-jointed holding component 5 with the center of the seamless steel pipe 1, and the automation efficiency is high.

[0070] Embodiment three:

[0071] The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 2 , Figure 4 and Figure 9-11 As shown, in this embodiment, the clamping assembly 6 also includes two elastic rings arranged in the cold air circulation groove, the ends of the elastic rings abut against the inner side surfaces of the cold air circulation groove, and the inner side surfaces of the elastic rings fit against the outer side surfaces of the seamless steel pipe 1.

[0072] Specifically: the elastic ring includes an inner elastic ring 64 and an outer elastic ring 66, the inner elastic ring 64 is connected to the corresponding chuck 61 through a plurality of connecting rods 65, the outer elastic ring 66 is sleeved on the outer side of the inner elastic ring 64, the end of the outer elastic ring 66 abuts against the inner side surface of the cold air circulation groove, and the inner side surface of the outer elastic ring 66 fits with the outer side surface of the seamless steel pipe 1; a plurality of shrinkage seams 67 are arranged on the inner edge of the outer elastic ring 66.

[0073] By rotating the corresponding adjusting studs 63, the multiple clamps 61 on the shaped cover 51 are controlled to synchronously retract toward the center of the seamless steel pipe 1. During this process, the multiple shrinkage seams 67 are closed, and the inner side surface of the outer elastic ring 66 is fully fitted with the outer side surface of the seamless steel pipe 1, so that the debris generated during the pipe cutting process is firmly confined between the shaped cover 51 and the seamless steel pipe 1; because the inner elastic ring 64 and the outer elastic ring 66 can be deformed together with the retraction of the multiple clamps 61, the fracture butt-jointing retaining assembly 5 is easy to install and disassemble on the outside of the seamless steel pipe 1.

[0074] The elastic modulus of the inner elastic ring 64 is greater than that of the outer elastic ring 66 , so that the elastic ring as a whole maintains a stable annular structure.

[0075] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

[0076] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A seamless steel pipe cutting device, characterized in that: The invention comprises a cutting assembly (3) capable of cutting a seamless steel pipe (1) from the inside to the outside, the cutting assembly (3) comprising an I-shaped slide seat (31) located on the inside of the seamless steel pipe (1) and capable of sliding along the radial direction of the seamless steel pipe (1), a cutting disc (33) and a rotary drive (32) for driving the cutting disc (33) to rotate are mounted on the I-shaped slide seat (31), and further comprising: An inner clamping assembly (2) for limiting the position of the cutting assembly (3) in the axial direction of the seamless steel pipe (1); the inner clamping assembly (2) comprises a plurality of positioning rings (22), the plurality of positioning rings (22) being distributed at different positions inside the seamless steel pipe (1) along the axial direction of the seamless steel pipe (1), a rotating disk (21) and a tightening airbag (23) being respectively arranged on the inner and outer sides of the positioning ring (22), the rotating disk (21) being rotatably mounted inside the positioning ring (22), the outer side surface of the tightening airbag (23) being able to fit with the inner side surface of the seamless steel pipe (1), and the plurality of rotating disks (21) being connected together via a guide rod (11); The I-shaped slide (31) is mounted on a turntable (21) located at an edge, a linear electric cylinder (34) for driving the I-shaped slide (31) to slide is mounted on the turntable (21), the cutting disc (33) is located between the two turntables (21), a U-shaped cover (4) is fixedly mounted on a positioning ring (22) located outside the turntable (21) at the other edge, and the U-shaped cover (4) covers the outside of the end of the seamless steel pipe (1); A fracture butt-jointed retaining assembly (5) is covered on the outer side of the middle of the seamless steel pipe (1); the fracture butt-jointed retaining assembly (5) comprises a U-shaped cover (51), the side of the U-shaped cover (51) is connected to a plurality of cold air injection pipes (52), and the middle of the U-shaped cover (51) corresponds to the middle position of the cutting blade (33); the U-shaped cover (4) and the U-shaped cover (51) are respectively pressed against the outer side surface of the seamless steel pipe (1) through a plurality of clamping assemblies (6).

2. The seamless steel pipe cutting device according to claim 1, characterized in that: The clamping assembly (6) comprises a clamping head (61), and a plurality of clamping heads (61) are independently and slidably provided on the U-shaped cover (4) and the polygonal cover (51); An elastic pad (62) and an adjusting stud (63) are respectively provided on both sides of the chuck (61); the elastic pad (62) can abut against the outer side surface of the seamless steel pipe (1); the adjusting stud (63) is rotatably connected to the chuck (61) and is engaged with the U-shaped cover (4) or the F-shaped cover (51) via a threaded engagement.

3. The seamless steel pipe cutting device according to claim 2, characterized in that: The wall thickness of the F-shaped cover (51) is uniform, and a protrusion structure extending in a direction away from the outer wall of the seamless steel pipe (1) is provided in the middle of the F-shaped cover (51), wherein the protrusion structure forms a cold air flow groove on the inner side of the middle of the F-shaped cover (51), and the bottom of the F-shaped cover (51) is connected to an exhaust and slag discharge pipe; The exhaust and slag discharge pipe and the plurality of cold air injection pipes (52) are all arranged at the raised structure in the middle of the polygonal cover (51).

4. The seamless steel pipe cutting device according to claim 1, characterized in that: The guide rod (11) is composed of a plurality of spliced ​​rods, the ends of adjacent spliced ​​rods are embedded in each other and locked in relative position by means of a latch, a turntable (21) located in the middle of the inner side of the seamless steel pipe (1) is fixedly connected to the spliced ​​rods, and the turntable (21) located at the end of the seamless steel pipe (1) is detachably connected to the spliced ​​rods by means of a fastener; and a handle I (12) is detachably connected to one end of the guide rod (11) located outside the seamless steel pipe (1).

5. The seamless steel pipe cutting device according to claim 1, characterized in that: The tightening airbag (23) is annular in structure, and a plurality of spacers (232) are arranged inside the tightening airbag (23), the spacers (232) divide the interior of the tightening airbag (23) into a plurality of independent inflatable cavities, and an air pipe (231) is fixedly connected and communicated with the end of the tightening airbag (23) corresponding to the position of the independent inflatable cavities, and the air pipe (231) passes through the positioning ring (22) and extends toward the outside of the end of the positioning ring (22).

6. The seamless steel pipe cutting device according to claim 5, characterized in that: The gas pipe (231) is connected to the exhaust pipe and the gas injection pipe via a three-way joint; valves I and II are installed on the exhaust pipe and the gas injection pipe, respectively; and the gas injection pipe is connected to the high-pressure gas tank.

7. The seamless steel pipe cutting device according to claim 3, characterized in that: The clamping assembly (6) also includes two elastic rings arranged in the cold air circulation groove, the ends of the elastic rings abut against the inner side surfaces of the cold air circulation groove, and the inner side surfaces of the elastic rings fit against the outer side surfaces of the seamless steel pipe (1).

8. The seamless steel pipe cutting device according to claim 7, characterized in that: The elastic ring comprises an inner elastic ring (64) and an outer elastic ring (66); the inner elastic ring (64) is connected to a correspondingly positioned clamp (61) via a plurality of connecting rods (65); the outer elastic ring (66) is sleeved on the outer side of the inner elastic ring (64); the end of the outer elastic ring (66) abuts against the inner side surface of the cold air circulation groove; and the inner side surface of the outer elastic ring (66) fits against the outer side surface of the seamless steel pipe (1).

9. The seamless steel pipe cutting device according to claim 8, characterized in that: The inner edge of the outer elastic ring (66) is provided with a plurality of shrinkage slits (67); when the plurality of shrinkage slits (67) are in a contracted state, the inner side surface of the outer elastic ring (66) is fully fitted to the outer side surface of the seamless steel pipe (1).

10. The seamless steel pipe cutting device according to claim 9, characterized in that: The elastic modulus of the inner elastic ring (64) is greater than the elastic modulus of the outer elastic ring (66).

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