A pipeline plasma hole opening device

Abstract

The present invention relates to a pipeline plasma hole opening device, comprising a pan head assembly, a swing arm assembly, a slide rail assembly, a plasma cutting assembly and a waste material extraction assembly, wherein the pan head assembly comprises a pan head support plate, a hollow rotating table and a turntable, the swing arm assembly comprises a swing arm and a bracket plate, the slide rail assembly is vertically mounted on the bracket plate, the plasma cutting assembly comprises an adapter, a plasma cutting gun and a laser rangefinder, the adapter is connected to the slide rail assembly, the vertical distances of the plasma cutting gun and the laser rangefinder to the axis of the hollow rotating table are equal, the waste material extraction assembly comprises a support tube, an electromagnet and a switch support plate, the upper end of the support tube passes through the swing arm, the turntable and the hollow rotating table in sequence and is fixedly connected to the pan head support plate, the electromagnet and the switch support plate are mounted on the lower end of the support tube through an elastic buffer, and a plurality of proximity switches are mounted on the switch support plate. The device has the advantages of compact structure, light weight, fast hole opening speed, strong functionality, and safety and reliability.

Description

Technical Field

[0001] The invention relates to a pipeline hole opening device, in particular to a pipeline hole opening device based on plasma cutting. Background Art

[0002] In the operation and management of gas pipelines, it is often necessary to carry out cutting and rerouting operations, and pipeline drilling is an important process for cutting and rerouting. At present, the pipeline drilling machines used in this field are mainly cylinder knife type drilling machines, which have many problems in practical applications, mainly manifested in the following aspects: 1. The product is relatively bulky and needs to be specially equipped with a hydraulic station, which is inconvenient to install and transport; 2. The drilling efficiency is low, and it often takes several hours to drill a hole, and it requires the cooperation of multiple people, which is labor-intensive; 3. The cylinder knife wears quickly, and the use and maintenance costs are high; 4. The drilling diameter has certain limitations, and the demand for large-diameter drilling often cannot meet the use requirements. Summary of the invention

[0003] The purpose of the present invention is to provide a pipeline plasma hole opening device, which has the advantages of compact structure, light weight, fast hole opening speed, strong functionality, safety and reliability, and can effectively improve operating efficiency and reduce costs and labor intensity.

[0004] In order to solve the above problems existing in the prior art, the present invention provides a pipeline plasma hole opening device, including a pan head assembly, a swing arm assembly, a slide rail assembly, a plasma cutting assembly and a waste extraction assembly, wherein the pan head assembly includes a pan head support plate and a hollow rotating table fixed on the pan head support plate, the rotating plate of the hollow rotating table is coaxially fixed with a hollow rotating table, the swing arm assembly includes a swing arm and a bracket plate, the swing arm is horizontally fixed on the rotating table, the bracket plate is vertically fixed on the swing arm, the slide rail assembly is vertically installed on the bracket plate, and the plasma cutting assembly is The component includes an adapter and a plasma cutting gun and a laser rangefinder fixed on the adapter. The adapter is connected to the slide rail assembly. The vertical distances between the plasma cutting gun and the laser rangefinder and the axis of the hollow turntable are equal. The waste extraction component includes a support tube, an electromagnet and a switch support plate. The upper end of the support tube passes through the swing arm, the turntable and the hollow turntable in sequence and is fixedly connected to the pan-tilt support plate. The electromagnet and the switch support plate are installed at the lower end of the support tube through an elastic buffer. A plurality of proximity switches distributed around the electromagnet are installed on the switch support plate.

[0005] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the elastic buffer comprises a pipe nut, a sleeve, a connecting rod, a spring and a hexagonal column, the pipe nut is screwed on the lower end of the support pipe through a thread, the sleeve passes through the bottom wall of the pipe nut, the outer wall of the sleeve is provided with a first limit platform at the upper side position of the bottom wall of the pipe nut, the upper half of the inner wall of the sleeve is provided with a second limit platform, the connecting rod passes through the sleeve, the lower half of the connecting rod is provided with a third limit platform in the sleeve, the lower end of the connecting rod is provided with a fourth limit platform, the upper end of the connecting rod is provided with a fifth limit platform on the upper side of the sleeve, the spring is sleeved on the connecting rod, the upper and lower ends of the spring are correspondingly pressed on the second limit platform and the third limit platform, the upper end of the hexagonal column is screwed on the lower end of the connecting rod through a threaded hole; the top of the electromagnet is screwed on the threaded column integrated with the hexagonal column through a threaded hole, and the switch support plate is fixedly connected to the lower end of the sleeve.

[0006] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the upper end of the sleeve is provided with symmetrical limiting grooves, and the connecting rod is provided with a limiting block located in the limiting groove.

[0007] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the slide rail assembly includes a base, a guide rail, a slider, a motor, a lead screw and a slide table, the base is fixed on a bracket plate, the upper and lower ends of the base are correspondingly fixed with an upper end plate and a lower end plate, the guide rail is fixed on the base, the slider is clamped on the guide rail and the two are slidably matched, the motor is fixed between the upper end plate and the swing arm, the lower end of the lead screw is installed on the lower end plate through a bearing, the upper end of the lead screw is connected to the shaft output shaft of the motor through a coupling, the slide table is fixedly connected to the slider and the adapter seat respectively, and a nut matching the lead screw is fixed in the slide table.

[0008] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein an axial photoelectric switch is installed on one side of the base through a first fixing bar, and an axial blocking piece cooperating with the axial photoelectric switch is fixed on one side of the slide.

[0009] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein an upper limit switch and a lower limit switch are installed on the other side of the base through a second fixing bar, and a stopper cooperating with the upper limit switch and the lower limit switch is fixed on the other side of the slide.

[0010] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein four proximity switches are evenly arranged along the circumference of the switch support plate, and a redundant limit switch cooperating with the electromagnet is also installed on the switch support plate.

[0011] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the upper end of the support tube passes through the pan / tilt support plate, and a plurality of threading holes are provided on the support tube.

[0012] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the plasma cutting gun is fixed to the adapter seat by a clamp and a buckle, and the laser rangefinder is fixed to the adapter seat by an adapter plate.

[0013] Furthermore, the present invention provides a pipeline plasma hole opening device, wherein the base is made of aluminum profile.

[0014] Compared with the prior art, the pipeline plasma hole opening device of the present invention has the following advantages: the present invention arranges a pan head assembly, a swing arm assembly, a slide rail assembly, a plasma cutting assembly and a waste material extraction assembly, so that the pan head assembly is provided with a pan head support plate and a hollow rotating table fixed on the pan head support plate, the hollow rotating table is coaxially fixed on the rotating disk of the hollow rotating table, the swing arm assembly is provided with a swing arm and a bracket plate, the swing arm is horizontally fixed on the rotating table, the bracket plate is vertically fixed on the swing arm, the slide rail assembly is vertically installed on the bracket plate, and the plasma cutting assembly is provided with a An adapter and a plasma cutting gun and a laser rangefinder fixed on the adapter are arranged, the adapter is connected to the slide rail assembly, and the vertical distances from the plasma cutting gun and the laser rangefinder to the axis of the hollow rotating table are equal, the waste extraction assembly is provided with a support tube, an electromagnet and a switch support plate, the upper end of the support tube passes through the swing arm, the rotating table and the hollow rotating table in sequence and is fixedly connected to the pan-tilt support plate, the electromagnet and the switch support plate are installed on the lower end of the support tube through an elastic buffer, and a plurality of proximity switches distributed around the electromagnet are installed on the switch support plate. Thus, a pipeline plasma hole opening device with a compact structure, light weight, fast hole opening speed, strong functionality, safety and reliability is formed. In practical applications, the present invention is installed on the lifting device in the hole opening machine through the pan-tilt support plate. During the hole-drilling operation, the present invention is first moved down from the connecting box of the hole-drilling machine to the welding pipe fitting by the lifting device, and the downward movement is stopped when the proximity switch triggers a signal. At this time, the electromagnet will be adsorbed on the pipe wall to be drilled; then the plasma cutting gun and the laser rangefinder are moved to the set initial position by the hollow rotating table and the slide rail assembly; then the laser rangefinder is rotated one circle by the hollow rotating table and the cutting path is scanned; then the plasma cutting gun is started, the hollow rotating table is rotated one circle at a set speed, and the distance between the plasma cutting gun and the pipe wall is controlled according to the cutting path. After the pipe wall is cut, the hollow rotating table, the slide rail assembly and the plasma cutting gun are stopped; finally, the present invention is moved up to the connecting box by the lifting device, and the subsequent process can be carried out, and the cut pipe wall will be extracted by the electromagnet. The present invention uses plasma cutting to perform pipe hole drilling. Compared with a tube cutter, the weight of the hole drilling machine can be effectively reduced, and the hole drilling speed and working efficiency can be improved. Practical application shows that it only takes a few minutes to complete a hole drilling by using plasma cutting. By setting a laser rangefinder and making the vertical distance between it and the plasma cutting gun and the axis of the hollow rotating table equal, the laser rangefinder is used to detect the distance to the pipe wall and construct a cutting path. According to the angle between the two, the height difference and the rotation speed of the hollow rotating table, the slide rail assembly can be conveniently controlled, and the distance from the plasma cutting gun to the pipe wall is always maintained within the working distance range, thereby improving the convenience of control and the reliability of cutting. By setting a waste extraction assembly and installing the electromagnet and the switch support plate on the support pipe through an elastic buffer, the functionality of the hole drilling device is enhanced, and damage caused by squeezing the electromagnet and the pipe wall can be effectively avoided, thereby improving safety and reliability.

[0015] The following is a further detailed description of a pipeline plasma opening device of the present invention in conjunction with the specific embodiments shown in the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of a pipeline plasma opening device of the present invention;

[0017] Figure 2 It is a left side view of a pipeline plasma opening device of the present invention;

[0018] Figure 3 It is a right side view of a pipeline plasma opening device of the present invention;

[0019] Figure 4 A three-dimensional pipeline plasma opening device according to the present invention Figure 1 ;

[0020] Figure 5 A three-dimensional pipeline plasma opening device according to the present invention Figure 2

[0021] Figure 6 A three-dimensional diagram of a pan / tilt assembly in a pipeline plasma opening device according to the present invention Figure 1 ;

[0022] Figure 7 A three-dimensional diagram of a pan / tilt assembly in a pipeline plasma opening device according to the present invention Figure 2 ;

[0023] Figure 8 It is a front view of a slide rail assembly in a pipeline plasma opening device of the present invention;

[0024] Fig. 9 It is a stereoscopic diagram of a slide rail assembly in a pipeline plasma opening device of the present invention;

[0025] Fig.10 for Figure 8 AA view in the figure;

[0026] Fig.11 A three-dimensional plasma cutting assembly in a pipeline plasma hole opening device of the present invention Figure 1 ;

[0027] Fig.12 A three-dimensional plasma cutting assembly in a pipeline plasma hole opening device of the present invention Figure 2 ;

[0028] Fig.13 It is a front view of a waste extraction component in a pipeline plasma opening device of the present invention;

[0029] Fig.14A three-dimensional diagram of a waste extraction component in a pipeline plasma opening device of the present invention;

[0030] Fig.15 for Fig.13 BB view in the figure;

[0031] Fig.16 It is a front view of an elastic buffer member in a pipeline plasma opening device of the present invention;

[0032] Fig.17 It is a left view of an elastic buffer member in a pipeline plasma opening device of the present invention;

[0033] Fig.18 A three-dimensional diagram of an elastic buffer in a pipeline plasma opening device of the present invention;

[0034] Fig.19 for Fig.17 CC view in the figure;

[0035] Fig. 20 The present invention is a diagram showing the installation and use status of a pipeline plasma opening device. DETAILED DESCRIPTION

[0036] First of all, it should be explained that the directional words such as up, down, left, right, front and back described in the present invention are only described according to the drawings for the convenience of understanding, and are not intended to limit the technical solution and the scope of protection of the present invention.

[0037] like Figures 1 to 20 The specific embodiment of the pipeline plasma hole opening device of the present invention is shown, which includes a pan head assembly 1, a swing arm assembly 2, a slide rail assembly 3, a plasma cutting assembly 4 and a waste extraction assembly 5. The pan head assembly 1 is provided with a pan head support plate 11 and a hollow rotating table 12 fixed on the pan head support plate 11, and a hollow rotating table 13 is coaxially fixed on the rotating disk of the hollow rotating table 12. The swing arm assembly 2 is provided with a swing arm 21 and a bracket plate 22, the swing arm 21 is horizontally fixed on the rotating table 13, and the bracket plate 22 is vertically fixed on the swing arm 21. The slide rail assembly 3 is vertically installed on the bracket plate 22. The plasma cutting assembly 4 is provided with an adapter 41 and a plasma cutting gun 42 and a laser rangefinder 43 fixed on the adapter 41, the adapter 41 is connected to the slide rail assembly 3, and the vertical distances from the plasma cutting gun 42 and the laser rangefinder 43 to the axis of the hollow rotating table 12 are equal. The waste extraction component 5 is provided with a support tube 51, an electromagnet 52 and a switch support plate 53, the upper end of the support tube 51 passes through the swing arm 21, the turntable 13 and the hollow rotating table 12 in sequence and is fixedly connected to the pan head support plate 11, the electromagnet 52 and the switch support plate 53 are installed on the lower end of the support tube 51 through elastic buffer parts, and a plurality of proximity switches 54 distributed around the electromagnet 52 are installed on the switch support plate 53.

[0038] The above structural arrangement constitutes a pipeline plasma hole-opening device with compact structure, light weight, fast hole-opening speed, strong functionality, safety and reliability. In practical applications, the present invention is installed on the lifting device 100 in the hole-opening machine through the pan-tilt support plate 11. During the hole-opening operation, the present invention is first moved down from the connecting box 200 of the hole-opening machine to the welding pipe fitting 300 through the lifting device, and the downward movement is stopped when the proximity switch 54 triggers a signal. At this time, the electromagnet 52 will be adsorbed on the pipe wall to be opened. Then, the plasma cutting gun 42 and the laser rangefinder 43 are moved to the set initial position through the hollow rotating table 12 and the slide rail assembly 3. Then, the laser rangefinder 43 is rotated one circle by the hollow rotating table 12 and the cutting path is scanned. Subsequently, the plasma cutting gun 42 is started, and the hollow rotating table 12 is rotated one circle at a set speed, and the distance between the plasma cutting gun 42 and the pipe wall is controlled according to the cutting path. After the pipe wall cutting is completed, the hollow rotating table 12, the slide rail assembly 3 and the plasma cutting gun 42 are stopped. Finally, the present invention is moved up to the connecting box by the lifting device, and the subsequent process can be carried out, and the cut pipe wall will be extracted by the electromagnet 52. The present invention uses plasma cutting to open the pipe hole, which can effectively reduce the weight of the hole opening machine compared to the tube knife, improve the hole opening speed and working efficiency. Practical application shows that it only takes a few minutes to open a hole by plasma cutting; by setting the laser rangefinder 43 and making it equal to the vertical distance from the axis of the hollow rotating table 12 with the plasma cutting gun 42, the laser rangefinder 43 is used to detect the distance of the pipe wall and construct the cutting path, and the slide rail assembly 3 can be conveniently controlled according to the angle, height difference and rotation speed of the hollow rotating table 12, and the distance from the plasma cutting gun 42 to the pipe wall is always kept within the working distance range, thereby improving the convenience of control and the reliability of cutting; by setting the waste extraction assembly 5 and installing the electromagnet 52 and the switch support plate 53 on the support tube 51 through the elastic buffer, the functionality of the equipment is enhanced, and the electromagnet 52 can be effectively prevented from being squeezed by the pipe wall and damaged during the downward movement of the hole opening device, thereby improving safety and reliability. It should be noted that the scanning and cutting path refers to the laser rangefinder rotating one circle and detecting and recording the distance of the pipe wall. In practical applications, the support tube 51 is coaxially arranged with the hollow rotating table 12 and the pan-tilt support plate 11, and the support tube 51 is clearance-matched with the swing arm 21, the turntable 13 and the hollow rotating table 12 to ensure the state stability of the waste extraction component 5 and avoid affecting the rotation of the hollow rotating table 12; the above-mentioned connection between the adapter 41 and the slide rail assembly 3 refers to the connection between the adapter 41 and the sliding part of the slide rail assembly 3. It should also be pointed out that during the hole opening operation, the connecting box 200 of the hole opening machine is installed on the welding pipe fitting 300 through the gate valve 400, and the welding pipe fitting 300 is welded on the pipe 500 to be opened.

[0039] As a specific embodiment, the elastic buffer of the present invention adopts the following structure: a tube nut 55, a sleeve 56, a connecting rod 57, a spring 58 and a hexagonal column 59 are provided. The tube nut 55 is screwed on the lower end of the support tube 51, the sleeve 56 is passed through the bottom wall of the tube nut 55, and a first limit platform 561 is provided on the outer wall of the sleeve 56 and at the upper side of the bottom wall of the tube nut 55, and a second limit platform 562 is provided on the upper half of the inner wall of the sleeve 56. The connecting rod 57 is passed through the sleeve 56, and a third limit platform 571 is provided in the sleeve 56 at the lower half of the connecting rod 57, a fourth limit platform 572 is provided at the lower end of the connecting rod 57, and a fifth limit platform 573 is provided at the upper side of the sleeve 56 at the upper end of the connecting rod 57. The spring 58 is sleeved on the connecting rod 57, and the upper and lower ends of the spring 58 are pressed against the second limit platform 562 and the third limit platform 571 accordingly. The hexagonal column 59 is screwed onto the lower end of the connecting rod 57 through the threaded hole at its upper end. The electromagnet 52 is screwed onto the threaded column integrated with the hexagonal column 59 through the threaded hole at its top, and the switch support plate 53 is fixedly connected to the lower end of the sleeve 56. The elastic buffer of this structure has the advantages of simple structure, convenient disassembly and assembly, good buffering effect, and strong adaptability. During the downward movement of the hole-opening device, the elastic buffering effect of the spring 58 can prevent the electromagnet 52 from being squeezed and damaged, thereby improving safety and reliability. At the same time, the sleeve 56 and the pipe nut 55 are overlapped by the first limit platform 561, which can effectively prevent the pipe wall from squeezing and damaging the proximity switch 54, thereby enhancing safety and reliability. As an optimization scheme, this specific embodiment is provided with a symmetrical limit groove at the upper end of the sleeve 56, and a limit block 574 in the limit groove is provided on the connecting rod 57. This structure can prevent the electromagnet 52 and the switch support plate 53 from rotating relative to each other, thereby enhancing the stability of the structure.

[0040] As a specific embodiment, the present invention makes the slide rail assembly 3 adopt the following structure: including a base 31, a guide rail 32, a slider 33, a motor 34, a lead screw 35 and a slide 36. The base 31 is fixed on the bracket plate 22, and the upper end plate 311 and the lower end plate 312 are fixed correspondingly at the upper and lower ends of the base 31, the guide rail 32 is fixed on the base 31, the slider 33 is clamped on the guide rail 32 and the two are slidably matched, and the motor 34 is fixed between the upper end plate 311 and the swing arm 21. The lower end of the lead screw 35 is installed on the lower end plate 312 through a bearing 37, the upper end of the lead screw 35 is connected to the shaft output shaft of the motor 34 through a coupling 38, the slide 36 is fixedly connected to the slider 33 and the adapter 41 respectively, and a nut 39 matched with the lead screw 35 is fixed in the slide 36. The slide rail assembly 3 of this arrangement has the advantages of simple structure and easy assembly. When the motor 34 drives the lead screw 35 to rotate, the slide table 36, the slider 33 and the adapter seat 41 can slide up and down along the guide rail 32 through the cooperation between the nut 39 and the lead screw 35.

[0041] As an optimization scheme, in this specific embodiment, an axial photoelectric switch 314 is installed on one side of the base 31 through a first fixing bar 313, and an axial baffle 361 that cooperates with the axial photoelectric switch 314 is fixed on one side of the slide 36. The cooperation of the axial photoelectric switch 314 and the axial baffle 361 can be used to axially position the plasma cutting gun 42 and the laser rangefinder 43, so as to determine the axial initial position, thereby improving the convenience and accuracy of control. It should be noted that in actual application, the present invention also sets a radial photoelectric switch (not shown in the figure) and a radial baffle (not shown in the figure) that cooperate with each other on the pan-tilt support plate 11 and the swing arm 21, so as to radially position the plasma cutting gun 42 and the laser rangefinder 43. At the same time, in order to improve safety and reliability, in this specific embodiment, an upper limit switch 316 and a lower limit switch 317 are installed on the other side of the base 31 through a second fixing bar 315, and a baffle 362 that cooperates with the upper limit switch 316 and the lower limit switch 317 is fixed on the other side of the slide 36. The cooperation between the stopper 362 and the upper limit switch 316 and the lower limit switch 317 can limit the upward and downward movement range of the slide rail assembly 3 to avoid damage to related components caused by excessive movement, thereby enhancing safety.

[0042] As a specific implementation, the present invention usually arranges four proximity switches 54 evenly along the circumference of the switch support plate 53 to improve the reliability of the trigger signal, but it is not limited to four, and can also be arranged to other numbers according to specific needs. This specific implementation also installs a redundant limit switch 510 that cooperates with the electromagnet 52 on the switch support plate 53. When the proximity switch fails or fails and the downward movement does not stop, the redundant limit switch 510 will contact the electromagnet 52 and trigger a signal. At this time, the purpose of safety protection can be achieved by forcibly stopping the lifting device, further enhancing safety and reliability. To facilitate wiring, this specific implementation allows the upper end of the support tube 51 to pass through the pan / tilt support plate 11, and a plurality of threading holes are set on the support tube 51.

[0043] It should be noted that, in practical applications, the plasma cutting gun 42 is fixed to the adapter 41 via a clamp 421 and a buckle 422, and the laser rangefinder 43 is fixed to the adapter 41 via an adapter plate 431. To simplify the process and reduce the weight, the present invention usually makes the base 31 made of aluminum profiles.

[0044] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the design concept of the present invention, various modifications made by those skilled in the art based on the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A pipeline plasma opening device, comprising a pan head assembly (1), a swing arm assembly (2), a slide rail assembly (3), a plasma cutting assembly (4) and a waste material extraction assembly (5), characterized in that: The pan-tilt assembly (1) comprises a pan-tilt support plate (11) and a hollow rotating table (12) fixed on the pan-tilt support plate (11); a hollow rotating table (13) is coaxially fixed to the rotating plate of the hollow rotating table (12); the swing arm assembly (2) comprises a swing arm (21) and a bracket plate (22); the swing arm (21) is horizontally fixed on the rotating table (13); the bracket plate (22) is vertically fixed on the swing arm (21); the slide rail assembly (3) is vertically mounted on the bracket plate (22); the plasma cutting assembly (4) comprises an adapter seat (41) and a plasma cutting gun (42) and a laser rangefinder (43) fixed on the adapter seat (41); the adapter seat ( 41) is connected to the slide rail assembly (3), the vertical distances from the plasma cutting gun (42) and the laser rangefinder (43) to the axis of the hollow rotating table (12) are equal, the waste extraction assembly (5) comprises a support tube (51), an electromagnet (52) and a switch support plate (53), the upper end of the support tube (51) passes through the swing arm (21), the rotating table (13) and the hollow rotating table (12) in sequence and is fixedly connected to the pan-tilt support plate (11), the electromagnet (52) and the switch support plate (53) are installed at the lower end of the support tube (51) through an elastic buffer, and a plurality of proximity switches (54) distributed around the electromagnet (52) are installed on the switch support plate (53).

2. A pipeline plasma opening device according to claim 1, characterized in that: The elastic buffer comprises a tube nut (55), a sleeve (56), a connecting rod (57), a spring (58) and a hexagonal column (59); the tube nut (55) is screwed onto the lower end of the support tube (51) through a thread; the sleeve (56) passes through the bottom wall of the tube nut (55); the outer wall of the sleeve (56) is provided with a first limiting platform (561) at the upper side of the bottom wall of the tube nut (55); the upper half of the inner wall of the sleeve (56) is provided with a second limiting platform (562); the connecting rod (57) passes through the sleeve (56); the lower half of the connecting rod (57) is provided with a third limiting platform (571) in the sleeve (56). ), a fourth limit platform (572) is provided at the lower end of the connecting rod (57), a fifth limit platform (573) is provided at the upper end of the connecting rod (57) and is located on the upper side of the sleeve (56), the spring (58) is sleeved on the connecting rod (57), the upper and lower ends of the spring (58) are pressed against the second limit platform (562) and the third limit platform (571) respectively, the upper end of the hexagonal column (59) is screwed onto the lower end of the connecting rod (57) through a threaded hole; the top of the electromagnet (52) is screwed onto a threaded column integrated with the hexagonal column (59) through a threaded hole, and the switch support plate (53) is fixedly connected to the lower end of the sleeve (56).

3. A pipeline plasma opening device according to claim 2, characterized in that: The upper end of the sleeve (56) is provided with a symmetrical limiting groove, and the connecting rod (57) is provided with a limiting block (574) located in the limiting groove.

4. A pipeline plasma opening device according to claim 3, characterized in that: The slide rail assembly (3) comprises a base (31), a guide rail (32), a slider (33), a motor (34), a lead screw (35) and a slide table (36); the base (31) is fixed on a bracket plate (22); an upper end plate (311) and a lower end plate (312) are fixed to the upper and lower ends of the base (31) respectively; the guide rail (32) is fixed on the base (31); the slider (33) is clamped on the guide rail (32) and the two are slidably matched. The motor (34) is fixed between the upper end plate (311) and the swing arm (21), the lower end of the lead screw (35) is mounted on the lower end plate (312) via a bearing (37), the upper end of the lead screw (35) is connected to the shaft output shaft of the motor (34) via a coupling (38), the slide (36) is fixedly connected to the slider (33) and the adapter (41) respectively, and a nut (39) matching the lead screw (35) is fixed in the slide (36).

5. A pipeline plasma opening device according to claim 4, characterized in that: An axial photoelectric switch (314) is installed on one side of the base (31) via a first fixing strip (313), and an axial blocking piece (361) matching the axial photoelectric switch (314) is fixed on one side of the slide table (36).

6. A pipeline plasma opening device according to claim 5, characterized in that: An upper limit switch (316) and a lower limit switch (317) are installed on the other side of the base (31) via a second fixing bar (315), and a stopper (362) cooperating with the upper limit switch (316) and the lower limit switch (317) is fixed on the other side of the slide (36).

7. A pipeline plasma opening device according to claim 6, characterized in that: Four proximity switches (54) are evenly arranged along the circumference of the switch support plate (53), and a redundant limit switch (510) cooperating with the electromagnet (52) is also installed on the switch support plate (53).

8. The pipeline plasma opening device according to claim 6, characterized in that: The upper end of the support tube (51) passes through the pan / tilt support plate (11), and a plurality of threading holes are provided on the support tube (51).

9. The pipeline plasma drilling device according to claim 6, characterized in that: The plasma cutting gun (42) is fixed on the adapter (41) via a clamp (421) and a buckle (422), and the laser rangefinder (43) is fixed on the adapter (41) via an adapter plate (431).

10. The pipeline plasma drilling device according to claim 6, characterized in that: The base (31) is made of aluminum profile.

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