Special cutting device for steel-in-steel steam pipeline

Abstract

The invention provides a cutting device special for a steel-in-steel steam pipeline, and relates to the technical field of cutting devices. An outer supporting chuck is fixed in the fixing frame through a screw; an inward shrinkage chuck is fixed on the fixing frame through a screw; a fixing block is fixed to the butt-joint chuck through a screw, and the fixing block is fixed to the inner moving mounting frame through a screw. A cutting gun head is in threaded connection with the interior of the fixing block. A constraint insertion block is inserted into the butt-joint chuck; the inner moving frame is slidably connected into the reverse fixing frame, so that the position of the inner moving frame can be conveniently adjusted through the adjusting rod in the adjusting process, a fixing block on the inner moving frame and a cutting gun head can be conveniently close to an inner pipe of the steel jacket steel steam pipeline, and the inner pipe can be conveniently cut while the inner pipe is not fixed again; the problem that the inner layer and the outer layer of the steel-sleeved-steel steam pipeline are kept in a coaxial and different-diameter state, so that the double pipes need to be installed again when being cut, and the cutting process is complex is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cutting devices, in particular to a special cutting device for steel-jacketed steel steam pipelines. Background Art

[0002] Steel-jacketed steel steam pipe, also known as double-layer steel pipe or lined steel pipe, is a specially designed piping system, mainly used to transport high-temperature and high-pressure steam. This pipe consists of two layers of inner and outer steel pipes. The outer steel pipe plays a protective and supporting role, while the inner steel pipe directly contacts and transports steam. The pipe is a composite pipe composed of two layers of inner and outer steel pipes, in which the inner pipe is used to transport steam and the outer pipe provides additional protection and support. When laying the steel-jacketed steel steam pipe, cutting is usually required to maintain the accuracy of the pipe assembly, so a special cutting device is required.

[0003] As for the current traditional pipe cutting device, the pipe is usually fixed by clamping during the cutting process, and the steel-in-steel steam pipe is composed of an inner and outer double layer, which makes it difficult to keep the inner pipe stable when cutting, making it inconvenient to cut. The inner and outer layers of the steel-in-steel steam pipe remain coaxial but have different diameters, so the double pipes need to be reinstalled when cutting, which makes the cutting process more complicated. Summary of the invention

[0004] The invention relates to a special cutting device for steel-in-steel steam pipelines, which comprises an outer support chuck and an inner retracting chuck. By fixing the double chuck structures on a fixing frame respectively, it is convenient to control the inner support frame and the inner retracting chuck to perform outward expansion and inward retraction adjustment respectively while maintaining stability, so that the inner pipe and the outer pipe of the steel-in-steel steam pipeline are fixed respectively by means of respective adjustment, so as to maintain the overall stability of the pipeline during the cutting process. By arranging a torsion frame and an inner moving frame, the inner moving frame is slidably connected to the inside of the anti-fixing frame, so as to facilitate the position adjustment of the inner moving frame by an adjusting rod during the synchronous adjustment process, so as to facilitate the fixing block and the cutting gun head on the inner moving frame to approach the inner pipe of the steel-in-steel steam pipeline, so as to facilitate the cutting process of the inner pipe without re-fixing.

[0005] In a first aspect, the present invention provides a special cutting device for steel-in-steel steam pipes, which specifically comprises: a fixed frame; a guide frame is fixed to the fixed frame by screws, and the threaded rods in the guide frame are connected to the control motor on the fixed frame; an auxiliary pad is fixed to the bottom of the guide frame by screws; a displacement frame is slidably connected to the inside of the guide frame, and the displacement frame is connected to the threaded rods inside the guide frame by threads; an external support chuck is fixed to the inside of the fixed frame by screws; an internal fixed support frame is fixed to the teeth of the external support chuck; The frame is fixed with an inner retractable chuck by screws, and the inner retractable chuck is fixed to the displacement frame by screws; the outer clamping frame is fixed to the clamping teeth of the inner retractable chuck by screws; the docking chuck is fixed to the displacement frame by screws; the outer wall of the docking chuck is provided with constraint slots at equal intervals; the docking chuck is slidably connected to the torsion frame; the bottom of the torsion frame is fixedly connected to the counter-fixed frame; the counter-fixed frame is rotatably connected to the adjusting rod; the counter-fixed frame is slidably connected to the inner moving frame, and the inner moving frame is connected to the adjusting rod by threads; the docking chuck is fixed with a screw A fixing block is fixed, and the fixing block is fixed to the inner moving frame by screws; the internal thread of the fixing block is connected to the cutting gun head; a constraint plug is inserted on the docking chuck, and the constraint plug is inserted inside the constraint slot; the external support chuck is set as a chuck structure, an adjustment component is provided inside the external support chuck, and the adjustment component of the external support chuck is connected with a clamping tooth; the docking chuck is set as a circular ring structure, a circular ring protrusion is provided on the docking chuck, a circular ring groove is provided on the outer side of the docking chuck, and a clamping tooth is provided on the inner wall of the docking chuck; the torsion frame is set as a U-shaped structure The structure is as follows: an arc-shaped groove is provided on the inner side of the torsion frame, the arc-shaped groove of the torsion frame is connected with a circular through hole, an arc-shaped protrusion is provided on the inner wall of the torsion frame, an arc-shaped protrusion is provided on the outer wall of the torsion frame, a displacement motor is provided on the torsion frame, and the displacement motor of the torsion frame is connected with a columnar gear; the anti-fixed frame is arranged in a circular ring structure, an L-shaped frame is provided on the outer wall of the anti-fixed frame, a rectangular sliding groove is provided on the L-shaped frame of the anti-fixed frame, and an axial hole is provided on the L-shaped frame of the anti-fixed frame; the inner moving frame is arranged in an L-shaped structure, a rectangular through hole is opened on the inner moving frame, and a threaded through hole is provided on the inner moving frame.

[0006] Preferably, the fixing frame is configured as a square plate-like structure, a circular through hole is provided in the middle position of the fixing frame, a circular ring-shaped protrusion is provided on the fixing frame, and a control motor is provided on the fixing frame; the guide frame is configured as a rectangular frame-like structure, two groups of rectangular protrusions are provided on the inner wall of the guide frame, and a threaded rod is rotatably connected to the inside of the guide frame.

[0007] Preferably, the auxiliary pad is configured as a T-shaped block structure; the displacement frame is configured as a square plate structure, a circular through hole is provided in the middle position of the displacement frame, a circular ring-shaped protrusion is provided on the displacement frame, a T-shaped through hole is provided on the displacement frame, and a threaded through hole is opened on the displacement frame.

[0008] Preferably, the inner fixed support frame is configured as a cylindrical rod-shaped structure, and a friction layer is provided on the outer wall of the inner fixed support frame.

[0009] Preferably, the retractable chuck is configured as a chuck structure, an adjusting assembly is provided inside the retractable chuck, the adjusting assembly of the retractable chuck is connected with a latching tooth, and a rectangular through hole is provided on the latching tooth of the retractable chuck.

[0010] Preferably, the outer clamping frame is configured as an arc-shaped plate-shaped structure, a friction layer is provided on the inner side of the outer clamping frame, and a rectangular parallelepiped structure is provided on the outer side of the outer clamping frame.

[0011] Preferably, the restraining slot is configured as a cylindrical groove.

[0012] Preferably, the adjusting rod is configured as a cylindrical structure, a threaded rod structure is provided on the adjusting rod, and a hexagonal columnar groove is provided on the adjusting rod.

[0013] Preferably, the fixing block is configured as an arc-shaped block structure, a threaded groove is provided on the fixing block, the threaded groove of the fixing block is connected with a circular through hole, and there are two groups of fixing blocks in total; the cutting gun head is a thermal cutting gun head, and a thread is provided on the outer wall of the cutting gun head.

[0014] Preferably, the restraining plug is configured as a cylindrical structure, and an annular protrusion is provided on the outer wall of the restraining plug.

[0015] The special cutting device for steel-in-steel steam pipe provided by the present invention has the following beneficial effects: The present invention is provided with a fixing frame and a displacement frame. By arranging annular protrusions on the fixing frame and the displacement frame, it is convenient to fix the external support chuck, the internal retraction chuck and the docking chuck. At the same time, other structures of the device can be adjusted conveniently to facilitate clamping of the steel-jacketed steel steam pipeline and cutting of the pipeline.

[0016] In addition, an inner fixing support frame and an outer clamping frame are provided. By connecting the inner fixing support frame and the outer clamping frame to the clamping teeth on the outer supporting chuck and the inner shrinking chuck respectively, it is convenient to fix the inner pipe and the outer pipe of the steel-in-steel steam pipeline respectively by means of outward expansion and inward contraction, so as to maintain the overall stability of the steel-in-steel steam pipeline during the cutting process.

[0017] In addition, a torsion frame and an anti-fixing frame are provided. By rotatably connecting the torsion frame to the docking chuck, the columnar gear cooperates with the teeth on the inside of the docking chuck to control the rotation of the torsion frame during the rotation process, thereby driving the fixed block and the cutting gun head to rotate, thereby facilitating the cutting of the outer pipe of the steel-jacketed steel steam pipeline.

[0018] In addition, an inner moving frame and an adjusting rod are provided. By threading the adjusting rod onto the inner moving frame, the adjusting rod can control the position of the inner moving frame on the anti-fixing frame through the thread during rotation, so as to facilitate driving the fixing block and the cutting gun head to approach the inner pipe of the steel-jacketed steel steam pipeline, so that the inner pipe can be cut under the drive of the torsion frame, thereby facilitating its use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] In the attached picture: Figure 1 A schematic diagram of a three-dimensional assembly structure of an outer tube in a cutting state according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a bottom-up structure of a three-dimensional assembly of an outer tube in a cutting state according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a three-dimensional assembly structure of an inner tube in a cutting state according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of a bottom-up structure of a three-dimensional assembly of an inner tube in a cutting state according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing a decomposition structure according to an embodiment of the present invention is shown; Figure 6 A schematic diagram showing an exploded bottom-up structure according to an embodiment of the present invention is shown; Figure 7 A schematic diagram showing a partial cutaway structure according to an embodiment of the present invention is shown; Figure 8 The embodiment according to the present invention is shown. Figure 7 The schematic diagram of the enlarged structure of part A is shown; Fig. 9 A schematic diagram showing a pipeline fixed position assembly structure according to an embodiment of the present invention is shown; Fig.10 A schematic diagram showing a pipeline cutting position assembly structure according to an embodiment of the present invention is shown; Fig.11 The embodiment according to the present invention is shown. Fig.10 Schematic diagram of the enlarged structure of part B.

[0022] Reference numerals list 1. Fixed frame; 2. Guide frame; 3. Auxiliary pad; 4. Displacement frame; 5. External support chuck; 6. Internal support frame; 7. Retractable chuck; 8. External clamping frame; 9. Docking chuck; 10. Constraint slot; 11. Torsion frame; 12. Counter-fixed frame; 13. Adjustment rod; 14. Internal displacement frame; 15. Fixed block; 16. Cutting gun head; 17. Constraint plug block. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0024] Example 1: Please refer to Figures 1 to 11The present invention proposes a special cutting device for steel-jacketed steel steam pipes, comprising: a fixed frame 1; a guide frame 2 is fixed to the fixed frame 1 by screws, and the threaded rods in the guide frame 2 are connected to the control motor on the fixed frame 1; an auxiliary pad 3 is fixed to the bottom of the guide frame 2 by screws; a displacement frame 4 is slidably connected to the inside of the guide frame 2, and the displacement frame 4 is connected to the threaded rods inside the guide frame 2 by threads; an external support chuck 5 is fixed to the inside of the fixed frame 1 by screws; an internal fixed support frame 6 is fixed to the teeth of the external support chuck 5; an inner shrinking chuck 7 is fixed to the fixed frame 1 by screws, and the inner shrinking chuck 7 is fixed to the displacement frame 4 by screws; an external clamping frame 8 is fixed to the teeth of the inner shrinking chuck 7 by screws; a pair of Connecting chuck 9; constraint slots 10 are equidistantly provided on the outer wall of the docking chuck 9; a torsion frame 11 is slidably connected to the docking chuck 9; a counter-fixed frame 12 is fixedly connected to the bottom of the torsion frame 11; an adjusting rod 13 is rotatably connected to the counter-fixed frame 12; an inner moving frame 14 is slidably connected to the counter-fixed frame 12, and the inner moving frame 14 is connected to the adjusting rod 13 by threads; a fixing block 15 is fixed to the docking chuck 9 by screws, and the fixing block 15 is fixed to the inner moving frame 14 by screws; a cutting gun head 16 is connected to the internal threads of the fixing block 15; a constraint plug-in block 17 is inserted into the docking chuck 9, and the constraint plug-in block 17 is inserted into the inside of the constraint slot 10; the outer support chuck 5 is set as a chuck structure, and an adjustment component is provided inside the outer support chuck 5, and the adjustment component of the outer support chuck 5 The parts are connected with a clamping tooth; the outer support chuck 5 is used to adjust the clamping tooth through the internal adjustment component, so as to control the outward expansion of the inner fixed support frame 6, to support and fix the inner pipe of the steel-in-steel steam pipeline, and to maintain the stability of the pipeline as a whole during the cutting process; the docking chuck 9 is set as an annular structure, and the docking chuck 9 is provided with an annular protrusion, the outer side of the docking chuck 9 is provided with an annular groove, and the inner wall of the docking chuck 9 is provided with a clamping tooth; the docking chuck 9 is used to assist in the installation of the torsion frame 11, and the relative position of the torsion frame 11 is assisted by the internal clamping tooth and the cylindrical gear on the torsion frame 11, so as to facilitate the cutting of the steel-in-steel steam pipeline; the torsion frame 11 is set as a U-shaped structure, the inner side of the torsion frame 11 is provided with an arc groove, and the torsion frame 1 The arc-shaped groove of 1 is connected with a circular through hole, the inner wall of the torsion frame 11 is provided with an arc-shaped protrusion, the outer wall of the torsion frame 11 is provided with an arc-shaped protrusion, the torsion frame 11 is provided with a displacement motor, and the displacement motor of the torsion frame 11 is connected with a columnar gear; the torsion frame 11 is used to cooperate with the anti-fixing frame 12 to fix the fixing block 15, so as to facilitate the fixing of the cutting gun head 16 and facilitate the cutting of the steel-jacketed steel steam pipe; the anti-fixing frame 12 is set as a circular ring structure, the outer wall of the anti-fixing frame 12 is provided with an L-shaped frame, the L-shaped frame of the anti-fixing frame 12 is provided with a rectangular sliding groove, and the L-shaped frame of the anti-fixing frame 12 is provided with an axial hole; the anti-fixing frame 12 is used to cooperate with the adjusting rod 13 to fix the inner moving frame 14, so as to facilitate the adjustment of the inner moving frame 14 and facilitate its use;The inner moving frame 14 is set as an L-shaped structure, and a rectangular through hole is opened on the inner moving frame 14, and a threaded through hole is provided on the inner moving frame 14; the inner moving frame 14 is used to cooperate with the docking chuck 9 to fix the fixing block 15 and the cutting gun head 16, so as to facilitate the cutting of the steel jacket steel steam pipe. ;

[0025] Embodiment 2: Based on Embodiment 1, Figures 1 to 11As shown, the fixing frame 1 is set as a square plate structure, a circular through hole is provided in the middle position of the fixing frame 1, a circular ring-shaped protrusion is provided on the fixing frame 1, and a control motor is provided on the fixing frame 1; the fixing frame 1 is used to assist in the installation and fixation of other structures of the device, so as to facilitate the overall stability of the device and facilitate the cutting of the steel-sheathed steel steam pipe; the guide frame 2 is set as a rectangular frame structure, two groups of rectangular protrusions are provided on the inner wall of the guide frame 2, and the internal rotation of the guide frame 2 is connected with a threaded rod; the threaded rod inside the guide frame 2 rotates under the drive of the control motor, so as to facilitate the control of the displacement frame 4 for adjustment and its use; the auxiliary pad 3 is set as a T-shaped block structure; the auxiliary pad 3 is used to support the guide frame 2 to assist in maintaining The holding device is stable and convenient for use; the displacement frame 4 is set as a square plate structure, a circular through hole is set in the middle position of the displacement frame 4, a circular ring-shaped protrusion is set on the displacement frame 4, a T-shaped through hole is set on the displacement frame 4, and a threaded through hole is opened on the displacement frame 4; the displacement frame 4 is used to assist in the installation of the external support chuck 5 and the internal shrinkage chuck 7, so as to facilitate the cutting of the steel-in-steel steam pipe; the internal fixed support frame 6 is set as a cylindrical rod-shaped structure, and a friction layer is set on the outer wall of the internal fixed support frame 6; the internal fixed support frame 6 supports the pipe inside the steel-in-steel steam pipe under the drive of the external support chuck 5, so as to facilitate the stability of the inner pipe during the cutting process; the internal shrinkage chuck 7 is set as a chuck structure, and an adjustment component is set inside the internal shrinkage chuck 7, and the adjustment component of the internal shrinkage chuck 7 is connected It is connected with a clamping tooth, and a rectangular through hole is opened on the clamping tooth of the retracting chuck 7; the retracting chuck 7 is used to control the position adjustment of the outer clamping frame 8 to facilitate the clamping of the outer tube of the steel-in-steel steam pipeline, so as to facilitate the stability of the outer tube of the steel-in-steel steam pipeline during the cutting process, which is convenient for its use; the outer clamping frame 8 is set as an arc plate-like structure, the inner side of the outer clamping frame 8 is provided with a friction layer, and the outer side of the outer clamping frame 8 is provided with a rectangular parallelepiped structure; the outer clamping frame 8 is used to adjust the position driven by the retracting chuck 7, so as to facilitate the clamping of the outer tube of the steel-in-steel steam pipeline, so as to facilitate the stability of the outer tube of the steel-in-steel steam pipeline during the cutting process, which is convenient for its use; the constraint slot 10 is set as a cylindrical groove; the constraint slot 10 is used to cooperate with the constraint plug 17 to hold the torsion frame 1 1 and the docking chuck 9 are in a relative state, so as to facilitate maintaining the stability between the two; the adjusting rod 13 is set as a cylindrical structure, the adjusting rod 13 is provided with a threaded rod structure, and the adjusting rod 13 is provided with a hexagonal columnar groove; the adjusting rod 13 is used to control the relative position of the inner moving frame 14 through the thread during the rotation process, so as to control the cutting gun head 16 to approach the inner pipe of the steel jacket steel steam pipeline, so as to avoid reinstalling it when cutting the inner pipe; the fixing block 15 is set as an arc block structure, the fixing block 15 is provided with a threaded groove, the threaded groove of the fixing block 15 is connected with a circular through hole, and the fixing block 15 is provided with two groups; the fixing block 15 is used to fix the cutting gun head 16, so as to facilitate its stability during the cutting process and facilitate its use;The cutting gun head 16 is a hot cutting gun head, and a thread is arranged on the outer wall of the cutting gun head 16; the cutting gun head 16 is used to cut the steel jacketed steel steam pipe; the restraining plug 17 is set as a cylindrical structure, and a circular ring-shaped protrusion is arranged on the outer wall of the restraining plug 17; the restraining plug 17 is used to maintain the relative state of the torsion frame 11 and the docking chuck 9, so as to facilitate the stability between the two. ;

[0026] The specific usage and function of this embodiment: In the present invention, when in use, the device is moved as a whole to the specified position, and the guide frame 2 is supported by the fixed frame 1 and the auxiliary pad 3, and then the control motor is started to conveniently drive the threaded rod inside the guide frame 2 to rotate and adjust, so that the threaded rod is adjusted in position through the threaded control displacement frame 4 during rotation, and then the steel-in-steel steam pipe to be cut is inserted into the outer support chuck 5 and the inner shrinkage chuck 7 on the fixed frame 1 and the displacement frame 4, and the inner pipe of the steel-in-steel steam pipe is sleeved on the inner fixed support frame 6, and then the adjustment components inside the outer support chuck 5 and the inner shrinkage chuck 7 are adjusted by external tools, so as to drive the teeth in the outer support chuck 5 and the inner fixed support frame 6 to expand outward through the adjustment components, so as to facilitate the inner pipe of the steel-in-steel steam pipe to be tightened and fixed, and at the same time, the teeth in the inner shrinkage chuck 7 and the outer clamping frame 8 are driven to shrink inward through the adjustment components, so as to facilitate the outer pipe of the steel-in-steel steam pipe to be clamped and fixed by the outer clamping frame 8, so as to maintain the overall stability of the steel-in-steel steam pipe; During the cutting process, the cutting gun head 16 is connected to the external control equipment, so that after the steel-in-steel steam pipeline is fixed, the outer tube of the steel-in-steel steam pipeline is cut by the cutting gun head 16, and then the driving motor is started to drive the columnar gear to rotate, and in the process of rotation, the teeth on the inner wall of the docking chuck 9 are matched to control the rotation adjustment of the torsion frame 11, so as to facilitate the adjustment of the cutting position of the outer tube of the steel-in-steel steam pipeline, so as to facilitate the cutting of the outer tube of the steel-in-steel steam pipeline. After the cutting of the outer tube of the steel-in-steel steam pipeline is completed, the cut part is taken out, and then the adjusting rod 13 is rotated, so that the adjusting rod 13 controls the inner moving frame 14 to adjust its position on the anti-fixing frame 12 through the thread during the rotation, and controls the relative fixed block 15 and the cutting gun head 16 to approach the inner tube of the steel-in-steel steam pipeline, so as to facilitate the cutting of the inner tube of the steel-in-steel steam pipeline, so as to complete the cutting of the steel-in-steel steam pipeline.

[0027] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0028] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0029] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A special cutting device for steel-in-steel steam pipes, characterized in that: include: A fixing frame (1), a guide frame (2) and an adjusting rod (13); A displacement frame (4) is slidably connected to the inside of the guide frame (2), and the displacement frame (4) is connected to the threaded rod inside the guide frame (2) via threads; An external support chuck (5) is fixed inside the fixing frame (1) by means of screws, the external support chuck (5) comprising a latching tooth and an adjustment component, the adjustment component being connected to the latching tooth; An inner fixed support frame (6) fixedly connected to the clamping teeth of the outer support chuck (5); The retractable chuck (7) is fixed to the displacement frame (4) by screws, and is also fixed to the fixing frame (1) by screws; A docking chuck (9) is fixed to the displacement frame (4) by means of screws, the docking chuck (9) is a circular ring structure, and is provided with constraint slots (10) at equal intervals, an annular groove is provided on the outer side of the docking chuck (9), a locking tooth is provided on the inner wall of the docking chuck (9), and an annular protrusion is provided on the docking chuck (9); A torsion frame (11) is slidably connected to the docking chuck (9), the torsion frame (11) is a U-shaped structure, an arc-shaped groove is provided on the inner side of the torsion frame (11), the arc-shaped groove of the torsion frame (11) is connected to a circular through hole, an arc-shaped protrusion is provided on the inner wall of the torsion frame (11), an arc-shaped protrusion is provided on the outer wall of the torsion frame (11), a displacement motor is provided on the torsion frame (11), and the displacement motor is connected to a columnar gear; A counter-fixed frame (12) is fixedly connected to the bottom of the torsion frame (11), the counter-fixed frame (12) is a circular ring structure, an L-shaped frame is provided on the outer wall of the counter-fixed frame (12), a rectangular sliding groove is provided on the L-shaped frame of the counter-fixed frame (12), and an axial hole is provided on the L-shaped frame of the counter-fixed frame (12); The inner moving frame (14) is slidably connected to the counter-fixed frame (12), the inner moving frame (14) is an L-shaped structure, a rectangular through hole is opened on the inner moving frame (14), a threaded through hole is provided on the inner moving frame (14), and the inner moving frame (14) is connected to the adjustment rod (13) through a thread.

2. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: The fixing frame (1) is configured as a square plate-shaped structure, a circular through hole is provided in the middle of the fixing frame (1), a circular ring-shaped protrusion is provided on the fixing frame (1), and a control motor is provided on the fixing frame (1); a guide frame (2) is fixed to the fixing frame (1) by screws, a threaded rod is provided inside the guide frame (2), and the threaded rod is connected to the control motor on the fixing frame (1); the guide frame (2) is configured as a rectangular frame-shaped structure, two groups of rectangular protrusions are provided on the inner wall of the guide frame (2), and a threaded rod is rotatably connected inside the guide frame (2).

3. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: An auxiliary pad (3) is fixed to the bottom of the guide frame (2) by screws, and the auxiliary pad (3) is arranged as a T-shaped block structure; the displacement frame (4) is arranged as a square plate structure, a circular through hole is arranged in the middle of the displacement frame (4), a circular ring-shaped protrusion is arranged on the displacement frame (4), a T-shaped through hole is arranged on the displacement frame (4), and a threaded through hole is opened on the displacement frame (4).

4. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: The inner fixed support frame (6) is configured as a cylindrical rod-shaped structure, and a friction layer is provided on the outer wall of the inner fixed support frame (6).

5. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: The retractable chuck (7) is configured as a chuck structure, an adjustment component is provided inside the retractable chuck (7), the adjustment component of the retractable chuck (7) is connected with a latching tooth, and a rectangular through hole is provided on the latching tooth of the retractable chuck (7).

6. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: An outer clamping frame (8) is fixed to the clamping teeth of the retractable chuck (7) by means of screws. The outer clamping frame (8) is arranged as an arc-shaped plate-like structure. A friction layer is arranged on the inner side of the outer clamping frame (8), and a rectangular parallelepiped structure is arranged on the outer side of the outer clamping frame (8).

7. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized in that: The restraining slot (10) is configured as a cylindrical groove.

8. The special cutting device for steel-in-steel steam pipe according to claim 1 is characterized by: An adjusting rod (13) is rotatably connected to the counter-fixing frame (12); the adjusting rod (13) is configured as a cylindrical structure, a threaded rod structure is provided on the adjusting rod (13), and a hexagonal column-shaped groove is provided on the adjusting rod (13).

9. The special cutting device for steel-in-steel steam pipe according to claim 1, characterized in that: A fixing block (15) is fixed to the docking chuck (9) by screws, and is also fixed to the inner moving frame (14) by screws. The fixing block (15) is arranged as an arc-shaped block structure. A threaded groove is arranged on the fixing block (15). The threaded groove of the fixing block (15) is connected to a circular through hole. There are two groups of fixing blocks (15). The internal thread of the fixing block (15) is connected to a cutting gun head (16). The cutting gun head (16) is a hot cutting gun head. The outer wall of the cutting gun head (16) is provided with a thread.

10. The special cutting device for steel-in-steel steam pipe according to claim 1, characterized in that: A restraining insert (17) is inserted into the restraining slot (10), and the restraining insert (17) is inserted into the docking chuck (9). The restraining insert (17) is configured as a cylindrical structure, and an annular protrusion is provided on the outer wall of the restraining insert (17).

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