Automatic plasma cutting device for spiral welded pipe

Abstract

The utility model discloses an automatic plasma cutting device for a spiral welded pipe, which comprises a track, a moving trolley walking along the track and a plasma cutting gun positioned on the moving trolley, a jacking air cylinder is mounted on the moving trolley, a lifting plate is mounted at the output end of the jacking air cylinder, a jacking wheel and a centering mechanism are mounted on the lifting plate, and the centering mechanism is mounted on the jacking air cylinder. The centering mechanism comprises a centering air cylinder, a top plate, a centering shaft, a centering frame and a lower pressing wheel. A linear sliding table is installed on the centering frame, a transverse moving frame is installed on a sliding seat of the linear sliding table, a plasma cutting gun is installed on the transverse moving frame, and the working end of the plasma cutting gun and the centering shaft are arranged at the same height. Through the centering mechanism, the working end of the plasma cutting gun can be flush with the left end of the spiral welding pipe, can be perpendicular to the welding face and is suitable for multiple spiral welding pipes with different diameters. The plasma cutting gun is driven by the linear sliding table to be horizontally close to the spiral welded pipe, so that the cutting effect is improved, the repeated labor work of workers is reduced, and the labor intensity of the workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting equipment, in particular to a plasma automatic cutting device for spiral welded pipes. Background Art

[0002] In the current online production of spiral welded pipes, the spiral welded pipes rotate and move forward at the same time, and the machine does not stop unless there is equipment failure. Therefore, after the finished product is produced, it is necessary to track and cut it without stopping. The common cutting device is a plasma cutting gun. By setting a plasma cutting gun on a mobile trolley that passively moves with the spiral welded pipe, when the length of the spiral welded pipe reaches the fixed length, the lifting cylinder of the mobile trolley is lifted up, so that the mobile trolley moves with the spiral welded pipe, and then the plasma cutting gun fixed on the mobile trolley is manually operated to approach the spiral welded pipe to cut the spiral welded pipe. After the cutting is completed, the plasma cutting gun is manually operated to move away from the spiral welded pipe, the lifting cylinder is operated to fall, and then the trolley is manually pushed back to the origin.

[0003] The cutting operation is usually performed by the crew operator, who has to go to the trolley position to operate every few minutes, which increases the labor intensity of the operator. The automation is poor, and the plasma cutting gun is not easy to be vertically facing the cutting surface, which easily leads to poor cutting effect.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0005] Based on this, it is necessary to provide a plasma automatic cutting device for spiral welded pipes to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a plasma automatic cutting device for spiral welded pipes, comprising a track, a mobile trolley moving along the track and a plasma cutting gun located on the mobile trolley, a lifting cylinder is installed on the mobile trolley, a lifting plate is installed on the output end of the lifting cylinder, a tensioning wheel and a centering mechanism are installed on the lifting plate, the centering mechanism comprises a centering cylinder, a top plate, a lower hinge shaft, a centering shaft, an upper hinge shaft, a first lower connecting rod, a second lower connecting rod, a first middle connecting rod, a second middle connecting rod, a first upper connecting rod, a second upper connecting rod, a centering frame and a lower pressure wheel, the centering cylinder and the lower hinge shaft are fixedly mounted on the lifting plate, the top plate is connected to the output end of the centering cylinder, the lower pressure wheel is installed at the lower end of the top and is located directly above the tensioning wheel, and the upper hinge shaft is connected to the output end of the centering cylinder. The shaft is fixedly installed on the top plate, the first lower connecting rod and the second lower connecting rod are rotatably installed on the lower hinge shaft, the middle part of the first middle connecting rod and the middle part of the second middle connecting rod are hinged through the centering shaft, the first upper connecting rod and the second upper connecting rod are rotatably installed on the upper hinge shaft, the upper end of the first lower connecting rod is hinged to the lower end of the first middle connecting rod, the upper end of the second lower connecting rod is hinged to the lower end of the second middle connecting rod, the lower end of the first upper connecting rod is hinged to the upper end of the first middle connecting rod, the lower end of the second upper connecting rod is hinged to the upper end of the second middle connecting rod, the centering frame is rotatably connected to the centering shaft, and the centering frame moves linearly in the vertical direction; a linear slide is installed on the centering frame, a transverse frame is installed on the slide seat of the linear slide, a plasma cutting gun is installed on the transverse frame, and the working end of the plasma cutting gun is set at the same height as the centering shaft.

[0007] Preferably, a first pressure sensor is installed on the lifting plate, and a tensioning wheel is installed on the detection end of the first pressure sensor.

[0008] Preferably, a second pressure sensor is installed on the top plate, and a lower pressure wheel is installed on the detection end of the second pressure sensor.

[0009] Preferably, a third pressure sensor is installed on the transverse frame, and a positioning wheel is installed at the detection end of the third pressure sensor.

[0010] Preferably, the centering shaft is rotatably connected to the transverse frame via a bearing.

[0011] Preferably, a guide rod is fixed to the lower end of the transverse frame, a guide sleeve is fixed to the lifting plate, and the guide rod is slidably plugged into the guide sleeve.

[0012] Preferably, a lower mounting seat is fixed on the lifting plate, and a lower hinge shaft is fixedly mounted on the lower mounting seat; an upper mounting seat is fixed on the top plate, and an upper hinge shaft is fixedly mounted on the upper mounting seat.

[0013] Preferably, a plurality of track wheels are provided at the lower end of the mobile trolley, and the track wheels are rollingly connected to the track, a driven sprocket is installed on the wheel axle of one of the track wheels, a driving motor is installed on the mobile trolley, a driving sprocket is installed at the output end of the driving motor, and the driving sprocket and the driven sprocket are connected by a transmission chain.

[0014] Preferably, the track is a double-row track, with four track wheels arranged in a rectangular distribution; an origin proximity switch and an end point proximity switch are arranged between the two tracks along their length, and both the origin proximity switch and the end point proximity switch are used to detect the position of the mobile vehicle.

[0015] The beneficial effects of the technical solution are as follows: when the passing length of the spiral welded pipe reaches the fixed length, the lifting plate and the tension wheel are driven to rise by the lifting cylinder, so that the tension wheel is pressed and contacted with the bottom end of the spiral welded pipe, so that the spiral welded pipe can drive the moving trolley to move synchronously; the centering mechanism makes the working end of the plasma cutting gun flush with the left end of the spiral welded pipe, and it is suitable for spiral welded pipes of various diameters; the linear slide drives the plasma cutting gun to move horizontally and linearly and vertically align with the left end point of the spiral welded pipe, thereby improving the cutting effect and cutting efficiency, while greatly reducing the repetitive labor of manual labor and reducing the labor intensity of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 A side view of an embodiment of the utility model;

[0018] In the figure, 1, track; 2, mobile trolley; 3, plasma cutting gun; 4, lifting cylinder; 5, lifting plate; 6, tension wheel; 7, centering mechanism; 8, centering cylinder; 9, top plate; 10, lower hinge shaft; 11, centering shaft; 12, upper hinge shaft; 13, first lower connecting rod; 14, second lower connecting rod; 15, first middle connecting rod; 16, second middle connecting rod; 17, first upper connecting rod; 18, second upper connecting rod rod; 19, centering frame; 20, lower pressure wheel; 21, linear slide; 22, transverse frame; 23, first pressure sensor; 24, second pressure sensor; 25, third pressure sensor; 26, positioning wheel; 27, bearing; 28, guide rod; 29, guide sleeve; 30, lower mounting seat; 31, upper mounting seat; 32, track wheel; 33, drive motor; 34, origin proximity switch; 35, end point proximity switch. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0020] See also Figure 1 and Figure 2 The embodiment of the present application provides a plasma automatic cutting device for spiral welded pipes, comprising a track 1, a mobile trolley 2 moving along the track 1 and a plasma cutting gun 3 located on the mobile trolley 2, the plasma cutting gun is connected to the plasma cutting machine host, a lifting cylinder 4 is installed on the mobile trolley 2, a lifting plate 5 is installed at the output end of the lifting cylinder 4, a tensioning wheel 6 and a centering mechanism 7 are installed on the lifting plate 5, and the centering mechanism 7 includes a centering cylinder 8, a top plate 9, and a lower hinge The connecting shaft 10, the centering shaft 11, the upper hinge shaft 12, the first lower connecting rod 13, the second lower connecting rod 14, the first middle connecting rod 15, the second middle connecting rod 16, the first upper connecting rod 17, the second upper connecting rod 18, the centering frame 19, the lower pressure wheel 20, the centering cylinder 8 and the lower hinge shaft 10 are fixedly installed on the lifting plate 5, the top plate 9 is connected to the output end of the centering cylinder 8, the lower pressure wheel 20 is installed at the lower end of the top and is located directly above the tension wheel 6, the upper hinge shaft The first lower connecting rod 12 is fixedly mounted on the top plate 9, the first lower connecting rod 13 and the second lower connecting rod 14 are rotatably mounted on the lower hinge shaft 10, the middle of the first middle connecting rod 15 and the middle of the second middle connecting rod 16 are hinged through the centering shaft 11, the first upper connecting rod 17 and the second upper connecting rod 18 are rotatably mounted on the upper hinge shaft 12, the upper end of the first lower connecting rod 13 is hinged to the lower end of the first middle connecting rod 15, and the upper end of the second lower connecting rod 14 is hinged to the lower end of the second middle connecting rod 16 The lower end of the first upper connecting rod 17 is hinged to the upper end of the first middle connecting rod 15, the lower end of the second upper connecting rod 18 is hinged to the upper end of the second middle connecting rod 16, the centering frame 19 is rotatably connected to the centering shaft 11, and the centering frame 19 moves linearly in the vertical direction; a linear slide 21 is installed on the centering frame 19, a transverse frame 22 is installed on the slide seat of the linear slide 21, and a plasma cutting gun 3 is installed on the transverse frame 22, and the working end of the plasma cutting gun 3 is set at the same height as the centering shaft 11.

[0021] When the length of the spiral welded pipe reaches the fixed length, the lifting cylinder 4 drives the lifting plate 5 and the tensioning wheel 6 to rise, so that the tensioning wheel 6 is pressed and contacted with the bottom end of the spiral welded pipe, so that the spiral welded pipe can drive the moving trolley 2 to move synchronously; then the centering cylinder 8 drives the top plate 9 to descend, so that the lower pressure wheel 20 presses the top end of the spiral welded pipe, so that the spiral welded pipe can drive the moving trolley 2 to move synchronously more stably; when the top plate 9 and the lifting plate 5 move, they will drive the lower hinge shaft 10, the centering shaft 11, the upper hinge shaft 12, the first lower connecting rod 13, the second lower connecting rod 14, the first middle connecting rod 15, the second middle connecting rod 16, the first middle connecting rod 17, the second middle connecting rod 18, the first middle connecting rod 19, the second middle connecting rod 20, the first middle connecting rod 21, the second middle connecting rod 22, the first middle connecting rod 23, the second middle connecting rod 24, the first middle connecting rod 25, the second middle connecting rod 26, the first middle connecting rod 27, the second middle connecting rod 28, the first middle connecting rod 29, the second middle connecting rod 29, the first middle connecting rod 21, the second middle connecting rod 28, the first middle connecting rod 29, the second middle connecting rod 29, the first middle connecting rod 21, the second middle connecting rod 26, the first middle connecting rod 27, the second middle connecting rod 28, the first middle connecting rod 29, the second middle connecting rod 29, the first middle connecting rod 29, the second middle connecting rod 28, the first middle connecting rod 29, the second middle connecting rod 29, the first middle connecting rod 29, the second middle connecting rod 2 The rod 16, the first upper connecting rod 17, and the second upper connecting rod 18 move, and keep the centering axis 11 at the center of the distance between the top plate 9 and the lifting plate 5, which is also the center of the distance between the lower pressure wheel 20 and the tension wheel 6, and the center of the spiral welded pipe; in this way, when the linear slide 21 drives the plasma cutting gun 3 to approach the left side of the spiral welded pipe, the working end of the plasma cutting gun 3 will be aligned with the left end point of the spiral welded pipe, so that the working end of the plasma cutting gun 3 can be perpendicular to the spiral welded pipe, so that the plasma cutting gun 3 can vertically cut the spiral welded pipe, thereby improving the cutting effect, and is suitable for spiral welded pipes of various diameters.

[0022] To obtain the signal that the tension wheel 6 is in contact with the spiral welded pipe, please refer to Figure 1 A first pressure sensor 23 is installed on the lifting plate 5, and a tension wheel 6 is installed at the detection end of the first pressure sensor 23. When the tension wheel 6 contacts the spiral welded pipe, the pressure value detected by the first pressure sensor 23 increases, thereby judging that the tension wheel 6 contacts the spiral welded pipe.

[0023] To obtain the signal that the lower pressing wheel 20 is in contact with the spiral welded pipe, please refer to Figure 1 A second pressure sensor 24 is installed on the top plate 9, and a lower pressing wheel 20 is installed at the detection end of the second pressure sensor 24. When the lower pressing wheel 20 contacts the spiral welded pipe, the pressure value detected by the second pressure sensor 24 increases, thereby judging that the lower pressing wheel 20 contacts the spiral welded pipe.

[0024] To obtain the signal that the plasma cutting gun 3 is close to the spiral welded pipe, please refer to Figure 1 , a third pressure sensor 25 is installed on the transverse frame 22, and a positioning wheel 26 is installed on the detection end of the third pressure sensor 25. When the positioning wheel 26 contacts the spiral welded pipe, the pressure value detected by the third pressure sensor 25 increases, thereby judging that the positioning wheel 26 contacts the spiral welded pipe. When the positioning wheel 26 contacts the spiral welded pipe, the plasma cutting gun 3 approaches the spiral welded pipe, and the plasma cutting gun 3 immediately starts the cutting operation. After a delay of 1s (settable), the linear slide 21 drives the plasma cutting gun 3 to retreat slightly to achieve the best cutting effect.

[0025] To facilitate the rotational connection between the transfer shaft and the transverse frame 22, please refer to Figure 1 and Figure 2 , the centering shaft 11 is rotatably connected to the transverse frame 22 through a bearing 27. The centering shaft 11 drives the transverse frame 22 to rise and fall through the bearing 27, and does not drive the transverse frame 22 to rotate.

[0026] To ensure that the traverse frame 22 can be lifted and lowered in a straight line, please refer to Figure 1 and Figure 2 A guide rod 28 is fixed at the lower end of the traverse frame 22, and a guide sleeve 29 is fixed on the lifting plate 5. The guide rod 28 and the guide sleeve 29 are slidably plugged. The guide rod 28 and the guide sleeve 29 guide the traverse frame 22, so that the traverse frame 22 can be stably lifted and lowered in a straight line.

[0027] To facilitate the installation of the lower hinge shaft 10 on the lifting plate 5, please refer to Figure 1 and Figure 2 A lower mounting seat 30 is fixed on the lifting plate 5, and the lower hinge shaft 10 is fixedly mounted on the lower mounting seat 30; in order to facilitate the installation of the upper hinge shaft 12 on the top plate 9, an upper mounting seat 31 is fixed on the top plate 9, and the upper hinge shaft 12 is fixedly mounted on the upper mounting seat 31.

[0028] To facilitate the movement of the mobile trolley 2 on the track 1, please refer to Figure 1 and Figure 2 , four track wheels 32 are provided at the lower end of the mobile trolley 2, and the track wheels 32 are rollingly connected with the track 1, a driven sprocket is installed on the wheel axle of one of the track wheels 32, a driving motor 33 is installed on the mobile trolley 2, and a driving sprocket is installed at the output end of the driving motor 33, and the driving sprocket and the driven sprocket are connected by a transmission chain. The track 1 is a double-row track 1, and the track wheels 32 are distributed in a rectangular shape; an origin proximity switch 34 and an end point proximity switch 35 are provided between the two rows of tracks 1 along their length direction, and the origin proximity switch 34 and the end point proximity switch 35 are both used to detect the position of the mobile trolley 2. When the mobile trolley 2 moves to the end point proximity switch 35, the end point proximity switch 35 detects the position of the mobile trolley 2 and determines that the cutting is completed; then the centering cylinder 8 drives the lower pressure wheel 20 to rise, and the lifting cylinder 4 drives the tensioning wheel 6 to descend, so that the lower pressure wheel 20 and the lifting wheel are both away from the spiral welded pipe, and the linear slide 21 drives the plasma cutting gun 3 away from the spiral welded pipe; then the driving motor 33 drives the active sprocket to rotate, and then drives the driven sprocket and the track wheel 32 to rotate through the transmission chain, so that the track wheel 32 is reset, and when the origin proximity switch 34 detects the position of the mobile trolley 2, it is determined that the trolley has completed the reset, and the driving motor 33 stops working.

[0029] All the above-mentioned electrical components are electrically connected to the controller of the spiral welded pipe production line.

[0030] Working principle: When the passing length of the spiral welded pipe reaches the fixed length, the lifting cylinder 4 drives the lifting plate 5 and the tension wheel 6 to rise, so that the tension wheel 6 is pressed and contacted with the bottom end of the spiral welded pipe, so that the spiral welded pipe can drive the moving trolley 2 to move synchronously; then the centering cylinder 8 drives the top plate 9 to descend, so that the lower pressure wheel 20 presses the top end of the spiral welded pipe, and the centering frame 19 and the linear slide 21 are driven and the plasma cutting gun 3 is moved up and down through the centering shaft 11, so that the working end of the plasma cutting gun 3 is flush with the left end of the spiral welded pipe, and it is suitable for a variety of spiral welded pipes with different diameters; the linear slide 21 drives the plasma cutting gun 3 to move horizontally and linearly and approach the left side of the spiral welded pipe, and the working end of the plasma cutting gun 3 will be vertically aligned with the left end point of the spiral welded pipe. When the third pressure sensor detects a signal, it sends an ignition signal to the plasma cutting machine host, and the plasma cutting gun 3 starts to work;

[0031] The spiral welded pipe rotates and moves at the same time. When the spiral welded pipe drives the mobile trolley 2 to move to the end point proximity switch 35, the plasma cutting gun 3 completes the cutting of the spiral welded pipe; then the centering cylinder 8 drives the lower pressure wheel 20 to rise, and the lifting cylinder 4 drives the tightening wheel 6 to descend, so that the lower pressure wheel 20 and the lifting wheel are both away from the spiral welded pipe, and the linear slide 21 drives the plasma cutting gun 3 away from the spiral welded pipe; then the track wheel 32 is rotated by the driving motor 33, so that the mobile trolley 2 returns to reset, and when the origin proximity switch 34 detects the position of the mobile trolley 2, it is determined that the trolley has completed the reset, and the driving motor 33 stops working; the automatic reset of the mobile trolley 2 is realized, which greatly improves the cutting efficiency, and at the same time greatly reduces the manual repetitive labor work and reduces the labor intensity of employees.

[0032] It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these are all within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A plasma automatic cutting device for spiral welded pipes, comprising a track (1), a moving trolley (2) moving along the track (1), and a plasma cutting gun (3) located on the moving trolley (2), characterized in that: The movable trolley (2) is provided with a lifting cylinder (4), the output end of which is provided with a lifting plate (5), the lifting plate (5) is provided with a tensioning wheel (6), and a centering mechanism (7), the centering mechanism (7) comprising a centering cylinder (8), a top plate (9), a lower hinge shaft (10), a centering shaft (11), an upper hinge shaft (12), a first lower connecting rod (13), a second lower connecting rod (14), a first middle connecting rod (15), a second middle connecting rod (16), The first upper connecting rod (17), the second upper connecting rod (18), the centering frame (19), the lower pressure wheel (20), the centering cylinder (8) and the lower hinge shaft (10) are fixedly mounted on the lifting plate (5); the top plate (9) is connected to the output end of the centering cylinder (8); the lower pressure wheel (20) is mounted at the lower end of the top and is located directly above the tension wheel (6); the upper hinge shaft (12) is fixedly mounted on the top plate (9); the first lower connecting rod (13) and the second lower connecting rod (14) are rotatably mounted on the lifting plate (5); On the lower hinge shaft (10), the middle part of the first middle layer connecting rod (15) and the middle part of the second middle layer connecting rod (16) are hinged through the centering shaft (11), the first upper layer connecting rod (17) and the second upper layer connecting rod (18) are rotatably mounted on the upper layer hinge shaft (12), the upper end of the first lower layer connecting rod (13) is hinged to the lower end of the first middle layer connecting rod (15), the upper end of the second lower layer connecting rod (14) is hinged to the lower end of the second middle layer connecting rod (16), and the lower end of the first upper layer connecting rod (17) is hinged to the first middle layer connecting rod ( 15) is hinged at the upper end, the lower end of the second upper connecting rod (18) is hinged to the upper end of the second middle connecting rod (16), the centering frame (19) is rotatably connected to the centering shaft (11), and the centering frame (19) moves linearly in the vertical direction; a linear slide (21) is installed on the centering frame (19), a transverse frame (22) is installed on the slide seat of the linear slide (21), and a plasma cutting gun (3) is installed on the transverse frame (22), and the working end of the plasma cutting gun (3) is arranged at the same height as the centering shaft (11).

2. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: A first pressure sensor (23) is mounted on the lifting plate (5), and a tensioning wheel (6) is mounted on the detection end of the first pressure sensor (23).

3. The plasma automatic cutting device for spiral welded pipe according to claim 1 is characterized in that: A second pressure sensor (24) is mounted on the top plate (9), and a lower pressure wheel (20) is mounted on the detection end of the second pressure sensor (24).

4. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: A third pressure sensor (25) is mounted on the transverse moving frame (22), and a positioning wheel (26) is mounted on the detection end of the third pressure sensor (25).

5. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: The centering shaft (11) is rotatably connected to the transverse frame (22) via a bearing (27).

6. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: A guide rod (28) is fixed to the lower end of the transverse moving frame (22), a guide sleeve (29) is fixed to the lifting plate (5), and the guide rod (28) and the guide sleeve (29) are slidably plugged.

7. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: A lower mounting seat (30) is fixed on the lifting plate (5), and a lower hinge shaft (10) is fixedly mounted on the lower mounting seat (30); an upper mounting seat (31) is fixed on the top plate (9), and an upper hinge shaft (12) is fixedly mounted on the upper mounting seat (31).

8. The plasma automatic cutting device for spiral welded pipe according to claim 1, characterized in that: A plurality of track wheels (32) are provided at the lower end of the mobile trolley (2), the track wheels (32) are rollingly connected to the track (1), a driven sprocket is mounted on the wheel axle of one of the track wheels (32), a driving motor (33) is mounted on the mobile trolley (2), a driving sprocket is mounted on the output end of the driving motor (33), and the driving sprocket is connected to the driven sprocket via a transmission chain.

9. The automatic plasma cutting device for spiral welded pipe according to claim 8, characterized in that: The track (1) is a double-row track (1), and the track wheels (32) are arranged in four numbers, and the track wheels (32) are arranged in a rectangular shape; an origin proximity switch (34) and an end point proximity switch (35) are arranged between the two rows of tracks (1) along their length direction, and the origin proximity switch (34) and the end point proximity switch (35) are both used to detect the position of the moving vehicle (2).

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