Pipe fitting connecting device

Abstract

The invention discloses a pipe fitting connecting device, relates to the technical field of pipe fitting welding, and provides the following scheme that the pipe fitting connecting device comprises a mounting frame and further comprises a multi-size pipeline clamping mechanism, the multi-size pipeline clamping mechanism is mounted on the mounting frame, and the multi-size pipeline clamping mechanism comprises two sets of first hydraulic cylinders; rubber plates are fixed to the close ends of the first hydraulic cylinders in each set, and first pressure sensors are installed on the rubber plates. The clamping problem of different pipe fittings is met through the multi-size pipeline clamping mechanism, the problem that the circle centers are difficult to align is solved through the circle center correcting mechanism, the situation that the upwarp circle centers are difficult to align due to the flexibility of the pipe fittings is also solved, the attractiveness, the sealing performance and the straightness rate of welding are guaranteed, and the welding efficiency is improved. And the welding gun moving mechanism is matched with the welding gun mechanism to enable the welding gun to obliquely move upwards, slope type welding is achieved, attractiveness and firmness are achieved, and the sealing effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of pipe welding, and in particular to a pipe connecting device. Background Art

[0002] Pipe welding is the best way to seal and connect metal pipes. Welding can ensure the service life of the pipes and their sealing properties.

[0003] However, the sizes of pipe fittings are not necessarily consistent when they are welded, and welding two pipe fittings of different diameters is difficult, including the difficulty of clamping and docking. Because the diameters of the two pipe fittings are different, clamping is more complicated. Not only do the two pipe fittings need to be clamped separately, but it is also difficult to align the center of the circle after clamping. This will directly affect the aesthetics and sealing of the welding, and will also affect the straightness of the two pipe fittings. Summary of the invention

[0004] The present invention provides a pipe connection device to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pipe connection device, comprising a mounting frame, and further comprising:

[0007] A multi-size pipe clamping mechanism, the multi-size pipe clamping mechanism is installed on a mounting frame, the multi-size pipe clamping mechanism comprises two groups of hydraulic cylinders, a rubber plate is fixed to a proximal end of each group of hydraulic cylinders, and a pressure sensor is installed on the rubber plate;

[0008] A circle center correction mechanism, the circle center correction mechanism is installed on the mounting frame, the circle center correction mechanism comprises two groups of hydraulic cylinders 2, one end of each group of hydraulic cylinders 2 is rotatably connected with a ball, and a pressure sensor 2 is installed on the hydraulic cylinders 2;

[0009] A driving mechanism 1, wherein the driving mechanism 1 is installed on one side of the mounting frame;

[0010] A rotating mechanism, the rotating mechanism being installed on one side of the multi-size pipe clamping mechanism;

[0011] A second driving mechanism, wherein the second driving mechanism is mounted on a mounting frame;

[0012] A welding gun moving mechanism, wherein the welding gun moving mechanism is mounted on a mounting frame;

[0013] A welding gun mechanism, wherein the welding gun mechanism is mounted on the welding gun moving mechanism;

[0014] A detection mechanism, wherein the detection mechanism is mounted on a mounting frame;

[0015] A controller is mounted on a mounting frame and is electrically connected to the first pressure sensor and the second pressure sensor.

[0016] Furthermore, the multi-size pipe clamping mechanism also includes a rotating shaft 1 that penetrates and is rotatably connected to the mounting frame, a one-way gear 1 is installed at one end of the rotating shaft 1, two sections of reciprocating threads 1 are opened on the outside of the rotating shaft 1, a moving block 1 is sleeved on the outside of the reciprocating thread 1, a collar 1 is fixed on one side of the moving block 1, a moving block 2 is fixed on one side of the collar 1, a guide rod 1 is sleeved inside the two moving blocks 2, the guide rod 1 is fixed to the mounting frame, an inner ring is rotatably connected to the inner wall of the collar 1, two groups of hydraulic cylinders 1 are respectively fixed to the inner walls of the two inner rings, and the multi-size pipe clamping mechanism maintains the same pressure clamping of multi-diameter pipe fittings by connecting multiple hydraulic cylinders, and also meets the requirements of multi-diameter same pressure clamping, and compensates for the pipe fittings after operation correction to avoid gaps that affect welding.

[0017] Furthermore, the center correction mechanism also includes a rotating shaft 2 that penetrates and rotates on the mounting frame, a one-way gear 2 is installed at one end of the rotating shaft 2, two sections of reciprocating threads 2 are opened on the outside of the rotating shaft 2, and a moving block 3 is sleeved on the outside of the reciprocating thread 2, a collar 2 is fixed on one side of the moving block 3, a moving block 4 is fixed on the top of the collar 2, and a guide rod 2 is sleeved inside the two moving blocks 4, and the guide rod 2 is fixed on the mounting frame, and the two groups of hydraulic cylinders 2 are respectively fixed on the inner walls of the two collars 2, and the hydraulic cylinder 2 is connected to the hydraulic cylinder 1 through a pipeline, and the pipeline is externally connected to an oil supply device, and the oil supply device is electrically connected to a controller. The center correction mechanism moves on the pipe fitting through the collar 2, the hydraulic cylinder 2 and the ball bearing to straighten the upturned pipe fitting, and the collar 1 and the collar 2 are used to ensure that the connecting ends of the two pipe fittings are located on the same center line, which is beneficial to later welding.

[0018] Furthermore, the driving mechanism 1 includes a motor 1 fixed on one side of the mounting frame, a gear 1 is fixed to one end of the output shaft of the motor 1, the gear 1 is meshed with a one-way gear 1 and a one-way gear 2, and the motor 1 is electrically connected to the controller.

[0019] Furthermore, the rotating mechanism includes a mounting ring fixed on one side of one of the inner rings, and a one-way gear three is fixed on the outside of the mounting ring. The rotating mechanism drives the pipe fitting to rotate, thereby ensuring 360-degree welding of the pipe fitting.

[0020] Furthermore, the welding gun moving mechanism includes a reciprocating screw rotatably connected to a mounting frame, a one-way gear four is externally installed on one end of the reciprocating screw, a moving block five is provided on the external threaded sleeve of the reciprocating screw, a guide rod three is fixed to the mounting frame, and a moving block six is ​​provided on the external sleeve of the guide rod three. The welding gun moving mechanism drives the welding gun to translate according to the coordinate data, so that the welding gun and the gap are on the same horizontal line, and cooperates with the cylinder of the welding gun mechanism to make the welding gun move obliquely upward during the welding process. The slope welding of large and small pipe fittings is more beautiful and has a better sealing effect.

[0021] Furthermore, the driving mechanism 2 includes a motor 2 fixed on a mounting frame, a gear 2 is fixed to one end of an output shaft of the motor 2, the gear 2 is meshed with a one-way gear 3 and a one-way gear 4, and the motor 2 is electrically connected to a controller.

[0022] Furthermore, the welding gun mechanism includes a cylinder fixed between the moving block five and the moving block six, the cylinder is connected to an external gas source, a welding gun is fixed at the bottom end of the cylinder, and the welding gun is electrically connected to the controller.

[0023] Furthermore, the detection mechanism includes a detector fixed on a mounting frame, and the detector is electrically connected to the controller.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention installs a multi-size pipe clamping mechanism to maintain the same pressure clamping of pipes of multiple diameters through the connection of multiple hydraulic cylinders, and also meets the clamping of multiple diameters with the same pressure, and compensates the pipes after running correction to avoid gaps that affect welding;

[0026] 2. The present invention installs a center correction mechanism to move on the pipe through the second sleeve ring, the second hydraulic cylinder and the ball bearing to straighten the upturned pipe, and ensures that the connecting ends of the two pipes are located on the same center line through the first sleeve ring and the second sleeve ring, which is beneficial to the later welding;

[0027] 3. The present invention drives the pipe to rotate by installing a rotating mechanism, thereby ensuring 360-degree welding of the pipe;

[0028] 4. The present invention installs a welding gun moving mechanism to drive the welding gun to move according to the coordinate data, so that the welding gun and the gap are on the same horizontal line, and cooperates with the cylinder of the welding gun mechanism to make the welding gun move upward obliquely during the welding process. The slope welding of large and small pipes is more beautiful and has a better sealing effect.

[0029] In summary, the equipment is novel in design and easy to operate. It meets the clamping problems of different pipe fittings through multi-size pipe clamping mechanisms, and solves the problem of difficult center alignment through the center correction mechanism. It also solves the problem of difficult center alignment caused by the softness of the pipe fittings, ensuring the aesthetics, sealing and straightness of the welding. The welding gun moving mechanism is combined with the welding gun mechanism to tilt the welding gun upward to achieve slope welding, which is more beautiful and firm, and has a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a first three-dimensional structural schematic diagram of a pipe connecting device proposed by the present invention.

[0031] Figure 2 This is a second three-dimensional structural schematic diagram of a pipe connecting device proposed by the present invention.

[0032] Figure 3 This is a schematic structural diagram of a multi-size pipe clamping mechanism of a pipe connection device proposed by the present invention.

[0033] Figure 4 The present invention provides a schematic structural diagram of a center point correction mechanism for a pipe connection device.

[0034] In the figure: 1, mounting frame; 2, multi-size pipe clamping mechanism; 21, collar 1; 22, inner ring; 23, shaft 1; 24, one-way gear 1; 25, moving block 2; 26, hydraulic cylinder 1; 27, rubber plate; 28, guide rod 1; 29, moving block 1; 3, center correction mechanism; 31, collar 2; 32, hydraulic cylinder 2; 33, ball bearing; 34, moving block 3; 35, shaft 2; 36, one-way gear 2; 37, moving block 4; 38, Guide rod two; 4, driving mechanism one; 41, motor one; 42, gear one; 5, rotating mechanism; 51, mounting ring; 52, one-way gear three; 6, driving mechanism two; 61, motor two; 62, gear two; 7, welding gun moving mechanism; 71, reciprocating screw; 72, one-way gear four; 73, moving block five; 74, guide rod three; 75, moving block six; 8, welding gun mechanism; 81, cylinder; 82, welding gun; 9, detector; 10, controller. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] 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" 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, rather than indicating or implying 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 limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] Example: Refer to Figure 1-4 : A pipe connection device, comprising a mounting frame 1, and further comprising:

[0039] The multi-size pipe clamping mechanism 2 is mounted on the mounting frame 1. The multi-size pipe clamping mechanism 2 includes two groups of hydraulic cylinders 26. A rubber plate 27 is fixed to one end of each group of hydraulic cylinders 26. A pressure sensor 1 is mounted on the rubber plate 27.

[0040] The center correction mechanism 3 is installed on the mounting frame. The center correction mechanism 3 includes two groups of hydraulic cylinders 32. One end of each group of hydraulic cylinders 32 is rotatably connected with a ball 33. A pressure sensor 2 is installed on the hydraulic cylinders 32.

[0041] A driving mechanism 1 4, wherein the driving mechanism 1 4 is installed on one side of the mounting frame 1;

[0042] A rotating mechanism 5, which is installed on one side of the multi-size pipe clamping mechanism 2;

[0043] A driving mechanism 2 6, the driving mechanism 2 6 is mounted on the mounting frame 1;

[0044] A welding gun moving mechanism 7, wherein the welding gun moving mechanism 7 is mounted on the mounting frame 1;

[0045] A welding gun mechanism 8, wherein the welding gun mechanism 8 is mounted on the welding gun moving mechanism 7;

[0046] A detection mechanism, the detection mechanism is installed on the mounting frame 1;

[0047] A controller 10, the controller 10 is mounted on the mounting frame 1, and the controller 10 is electrically connected to the pressure sensor 1 and the pressure sensor 2;

[0048] The multi-size pipe clamping mechanism 2 also includes a rotating shaft 23 that is rotatably connected to the mounting frame 1, a one-way gear 24 is installed at one end of the rotating shaft 23, two sections of reciprocating threads 1 are opened on the outside of the rotating shaft 23, a moving block 29 is sleeved on the outside of the reciprocating thread 1, a collar 21 is fixed on one side of the moving block 29, a moving block 25 is fixed on one side of the collar 21, a guide rod 28 is sleeved inside the two moving blocks 25, the guide rod 28 is fixed on the mounting frame 1, an inner ring 22 is rotatably connected to the inner wall of the collar 21, two groups of hydraulic cylinders 26 are respectively fixed on the inner walls of the two inner rings 22, and the multi-size pipe clamping mechanism maintains the same pressure clamping for pipes of multiple diameters by connecting multiple hydraulic cylinders, and also meets the clamping of multiple diameters with the same pressure, and compensates for the pipes after running correction to avoid gaps that affect welding;

[0049] The circle center correction mechanism 3 also includes a rotating shaft 2 35 that is rotatably connected to the mounting frame 1, and a one-way gear 2 36 is installed at one end of the rotating shaft 2 35. Two sections of reciprocating threads 2 are opened on the outside of the rotating shaft 2 35, and a moving block 34 is sleeved on the outside of the reciprocating thread 2. A collar 2 31 is fixed on one side of the moving block 34, and a moving block 4 37 is fixed on the top of the collar 2 31. The insides of the two moving blocks 4 37 are sleeved with guide rods 2 38, and the guide rods 2 38 are fixed on the mounting frame 1. Two groups of hydraulic cylinders 2 32 are respectively fixed on the inner walls of the two collars 2 31. The hydraulic cylinder 2 32 is connected to the hydraulic cylinder 1 26 through a pipeline, and the pipeline is externally connected to an oil supply device, and the oil supply device is electrically connected to the controller 10. The circle center correction mechanism moves on the pipe fitting through the collar 2 31, the hydraulic cylinder 2 32 and the ball 33 to straighten the upturned pipe fitting, and the collar 1 and the collar 2 are used to ensure that the connecting ends of the two pipe fittings are located on the same center line, which is conducive to later welding.

[0050] The driving mechanism 1 4 includes a motor 1 41 fixed to one side of the mounting frame 1, a gear 1 42 is fixed to one end of the output shaft of the motor 1 41, the gear 1 42 is meshed with the one-way gear 1 24 and the one-way gear 2 36, and the motor 1 41 is electrically connected to the controller 10;

[0051] The rotating mechanism 5 includes a mounting ring 51 fixed to one side of one of the inner rings 22, and a one-way gear 3 52 is fixed to the outside of the mounting ring 51. The rotating mechanism drives the pipe to rotate, thereby ensuring 360-degree welding of the pipe;

[0052] The welding gun moving mechanism 7 includes a reciprocating screw 71 rotatably connected to the mounting frame 1, a one-way gear 4 72 is externally installed at one end of the reciprocating screw 71, a moving block 5 73 is sleeved on the external thread of the reciprocating screw 71, a guide rod 3 74 is fixed on the mounting frame 1, and a moving block 6 75 is sleeved on the external surface of the guide rod 3 74. The welding gun moving mechanism drives the welding gun to move horizontally according to the coordinate data, so that the welding gun and the gap are on the same horizontal line, and cooperates with the cylinder of the welding gun mechanism to make the welding gun move obliquely upward during the welding process, so that the slope welding of large and small pipes is more beautiful and has a better sealing effect;

[0053] The driving mechanism 2 6 includes a motor 2 61 fixed on the mounting frame 1, a gear 2 62 is fixed to one end of the output shaft of the motor 2 61, the gear 2 62 is meshed with the one-way gear 3 52 and the one-way gear 4 72, and the motor 2 61 is electrically connected to the controller 10;

[0054] The welding gun mechanism 8 includes a cylinder 81 fixed between the moving block 5 73 and the moving block 6 75. The cylinder 81 is connected to an external gas source. A welding gun 82 is fixed at the bottom end of the cylinder 81. The welding gun 82 is electrically connected to the controller 10.

[0055] The detection mechanism includes a detector 9 fixed on the mounting frame 1 , and the detector 9 is electrically connected to the controller 10 .

[0056] Working principle:

[0057] First, two pipes to be connected are inserted from both sides of the device respectively, and then the oil supply device is controlled by the controller 10 to supply oil to the hydraulic cylinder 1 26 and the hydraulic cylinder 2 32 at the same time. The hydraulic cylinder 1 26 pushes the rubber plate 27 to move, and the hydraulic cylinder 2 32 pushes the ball 33 to move, so that the rubber plate 27 and the ball 33 are in contact with the pipe. Because the multiple groups of hydraulic cylinders are connected, the oil will be input into the multiple hydraulic cylinders. Because the diameters of the clamped pipes are different, the hydraulic cylinder that first contacts the pipe through the ball 33 or the rubber plate 27 has difficulty in oil entry, and then the oil will flow into the hydraulic cylinder that does not contact the surface of the pipe until all the hydraulic cylinders have completed the contact between the ball 33 or the rubber plate 27 and the pipe. In the clamping process, multiple pressure sensors 1 and 2 transmit pressure signals to the controller 10 until all pressure values ​​are in the same range. At this time, the pressure of all hydraulic cylinders on the pipe is in the same range. The purpose is to maintain the same pressure clamping for pipes of multiple diameters by connecting multiple hydraulic cylinders, and also meet the clamping of multiple diameters with the same pressure.

[0058] Then start the motor 1 41 to rotate forward to drive the gear 1 42 to rotate. Whether the gear 1 42 rotates forward or reverse, it will drive the one-way gear 1 24 and the one-way gear 2 36 to rotate at the same time. However, the one-way gear 1 24 and the one-way gear 2 36 drive the central shaft to rotate in opposite directions. Only when the gear 1 42 rotates reversely will the one-way gear 1 24 drive the central shaft to rotate, and the one-way gear 2 36 will rotate idly. On the contrary, when the gear 1 42 rotates forward, the one-way gear 1 24 will rotate idly, and the one-way gear 2 36 will drive the central shaft to rotate. The central shaft drives the rotating shaft 2 35 to rotate so that the moving block 34 rotates on the reciprocating thread 2 The pipe is moved upward and close to the pipe. During the movement, the second sleeve ring 31, the second hydraulic cylinder 32 and the ball 33 are driven to move. Because the ball 33 has pressure on the pipe fitting, and because the pipe fitting has a certain length, and the clamping only clamps one end of the pipe fitting, the pipe fitting not located inside the device will sag and bend due to its own gravity. The sagging and bending will cause the connecting end of the pipe fitting to warp upward. Therefore, the second sleeve ring 31, the second hydraulic cylinder 32 and the ball 33 are moved on the pipe fitting to straighten the warped pipe fitting, so as to ensure that the connecting ends of the two pipe fittings are located on the same center line, which is conducive to the later welding.

[0059] After straightening, the pipe fittings need to be compensated, because the upward warping and manual placement of the pipe fittings will cause a certain gap between the pipe fittings. At this time, the detector 9 is started to detect the gap, and then the motor 41 is reversed to drive the gear 42 to rotate, so that the gear 42 drives the one-way gear 24 and the rotating shaft 23 to rotate, so that the moving block 29 drives the ring 21 to approach each other, and the ring 21 drives the inner ring 22, the hydraulic cylinder 26 and the rubber plate 27 to move and drive the clamped pipe fittings to move. When it is detected that the gap between the two pipe fittings disappears, the detector 9 sends the coordinates of the disappearing position to the controller 10. Due to the manual placement of the pipe fittings, it cannot be guaranteed that the lengths of the pipe fittings are equal. Therefore, the positions where the gaps disappear are different when docking, so the position of the welding gun 82 needs to be adjusted. After receiving the coordinate data, the controller 10 controls the motor 2 61 to drive the gear 2 62 to reverse, and the one-way gear 3 52 and the one-way gear 4 72 also turn in the opposite direction, so the gear 2 62 When reversing, the one-way gear four 72 and the reciprocating screw 71 are driven to rotate, so that the moving block five 73 drives the cylinder 81 to move to the coordinate position, and then the cylinder 81 is operated to make the welding gun 82 move down and contact the gap, and then the welding gun 82 is started to weld the pipe fittings. If the pipe fittings with different diameters are welded, the welding gun 82 can be moved upward by controlling the cylinder 81 during the welding process, and the reciprocating screw 71 is controlled to rotate to make the welding gun 82 translate, so as to achieve the purpose of tilting upward, so that the welding position presents a slope, and the welding is more firm. According to the situation, the motor two 61 is controlled to reverse so that the gear two 62 drives the one-way gear three 52 and the mounting ring 51 to rotate, and the mounting ring 51 drives the inner ring 22 connected thereto to rotate, and the inner ring 22 and the hydraulic cylinder one 26 and other structures rotate, and the hydraulic cylinder one 26 drives one of the pipe fittings to rotate through the rubber plate 27, and one of the pipe fittings drives the other pipe fitting to rotate through welding, and the gap is welded 360 degrees by rotating the pipe fitting to ensure the sealing of the pipe fitting.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipe connection device, comprising a mounting frame (1), characterized in that Also includes: A multi-size pipe clamping mechanism (2), the multi-size pipe clamping mechanism (2) being mounted on a mounting frame (1), the multi-size pipe clamping mechanism (2) comprising two groups of hydraulic cylinders (26), a rubber plate (27) being fixed to a proximal end of each group of hydraulic cylinders (26), a pressure sensor (27) being mounted on the rubber plate (27); A circle center correction mechanism (3), the circle center correction mechanism (3) is installed on a mounting frame, the circle center correction mechanism (3) comprises two groups of hydraulic cylinders (32), one end of each group of hydraulic cylinders (32) being rotatably connected to a ball (33), and a pressure sensor (33) is installed on the hydraulic cylinders (32); A driving mechanism (4), wherein the driving mechanism (4) is mounted on one side of the mounting frame (1); A rotating mechanism (5), wherein the rotating mechanism (5) is installed on one side of the multi-size pipe clamping mechanism (2); A second driving mechanism (6), wherein the second driving mechanism (6) is mounted on the mounting frame (1); A welding gun moving mechanism (7), wherein the welding gun moving mechanism (7) is mounted on the mounting frame (1); A welding gun mechanism (8), wherein the welding gun mechanism (8) is mounted on the welding gun moving mechanism (7); A detection mechanism, the detection mechanism being mounted on a mounting frame (1); A controller (10), wherein the controller (10) is mounted on the mounting frame (1), and the controller (10) is electrically connected to the first pressure sensor and the second pressure sensor.

2. A pipe connection device according to claim 1, characterized in that: The multi-size pipe clamping mechanism (2) also includes a rotating shaft (23) that passes through and is rotatably connected to the mounting frame (1), a one-way gear (24) is installed at one end of the rotating shaft (23), two sections of reciprocating threads are opened on the outside of the rotating shaft (23), a moving block (29) is sleeved on the outside of the reciprocating threads, a collar (21) is fixed on one side of the moving block (29), a moving block (25) is fixed on one side of the collar (21), a guide rod (28) is sleeved inside the two moving blocks (25), the guide rod (28) is fixed on the mounting frame (1), the inner wall of the collar (21) is rotatably connected to the inner ring (22), and the two groups of hydraulic cylinders (26) are respectively fixed on the inner walls of the two inner rings (22).

3. A pipe connection device according to claim 2, characterized in that: The center correction mechanism (3) also includes a rotating shaft (35) that passes through and is rotatably connected to the mounting frame (1), a one-way gear (36) is installed at one end of the rotating shaft (35), two sections of reciprocating threads (2) are opened on the outside of the rotating shaft (35), a moving block (34) is sleeved on the outside of the reciprocating threads (2), a collar (31) is fixed on one side of the moving block (34), a moving block (37) is fixed on the top of the collar (31), and a guide rod (38) is sleeved inside the two moving blocks (37), the guide rod (38) is fixed on the mounting frame (1), and the two groups of hydraulic cylinders (32) are respectively fixed on the inner walls of the two collars (31), the hydraulic cylinder (32) is connected to the hydraulic cylinder (26) through a pipeline, the pipeline is externally connected to an oil supply device, and the oil supply device is electrically connected to the controller (10).

4. A pipe connection device according to claim 2, characterized in that: The driving mechanism 1 (4) comprises a motor 1 (41) fixed to one side of the mounting frame (1); a gear 1 (42) is fixed to one end of the output shaft of the motor 1 (41); the gear 1 (42) is meshed with a one-way gear 1 (24) and a one-way gear 2 (36); and the motor 1 (41) is electrically connected to a controller (10).

5. A pipe connection device according to claim 2, characterized in that: The rotating mechanism (5) comprises a mounting ring (51) fixed to one side of one of the inner rings (22), and a one-way gear three (52) is fixed to the outside of the mounting ring (51).

6. A pipe connection device according to claim 5, characterized in that: The welding gun moving mechanism (7) comprises a reciprocating screw (71) rotatably connected to the mounting frame (1), a one-way gear four (72) is externally mounted on one end of the reciprocating screw (71), a moving block five (73) is sleeved on the external thread of the reciprocating screw (71), a guide rod three (74) is fixed on the mounting frame (1), and a moving block six (75) is sleeved on the external surface of the guide rod three (74).

7. A pipe connection device according to claim 6, characterized in that: The driving mechanism 2 (6) comprises a motor 2 (61) fixed on the mounting frame (1), a gear 2 (62) being fixed to one end of the output shaft of the motor 2 (61), the gear 2 (62) being meshed with a one-way gear 3 (52) and a one-way gear 4 (72), and the motor 2 (61) being electrically connected to the controller (10).

8. A pipe connection device according to claim 6, characterized in that: The welding gun mechanism (8) comprises a cylinder (81) fixed between the moving block five (73) and the moving block six (75), the cylinder (81) is connected to an external gas source, a welding gun (82) is fixed at the bottom end of the cylinder (81), and the welding gun (82) is electrically connected to the controller (10).

9. A pipe connection device according to claim 1, characterized in that: The detection mechanism comprises a detector (9) fixed on a mounting frame (1), and the detector (9) is electrically connected to a controller (10).

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