Clamping and positioning mechanism for high-frequency welded pipe

Abstract

The invention discloses a clamping and positioning mechanism for a high-frequency welded pipe, and belongs to the technical field of welded pipe clamping and positioning, the clamping and positioning mechanism comprises a supporting table, a limiting rod and a lead screw, the limiting rod and the lead screw are connected to the supporting table through protrusions and are parallel to each other, a second motor is installed on the upper surface of the supporting table, and the lead screw is connected to the shaft end of the second motor; two supporting sleeves are arranged above the supporting table, a limiting rod movably penetrates through the two supporting sleeves, a lead screw further penetrates through the two supporting sleeves in a threaded mode, a centering clamping assembly is installed on each supporting sleeve, two sections of threads opposite in thread rotation direction are arranged on the lead screw, and the two sections of threads are in threaded connection with the two supporting sleeves correspondingly. By means of the welding pipe clamping device, the welding pipes can be clamped, the to-be-welded ends of the two welding pipes can be supported, the problem that the welding ends of the welding pipes are bent downwards due to gravity is solved, the butt joint accuracy of the two welding pipes is guaranteed, in addition, it can be guaranteed that the two welding pipes rotate synchronously, and then it can be guaranteed that the welding process is conducted smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping and positioning of welded pipes, and specifically provides a clamping and positioning mechanism for high-frequency welded pipes. Background Art

[0002] Welded steel pipes, also known as welded tubes, are steel pipes made by welding steel plates or strips after curling. The production process of welded steel pipes is simple. When used, welded pipes need to be cut or welded. Existing welded pipes need to be clamped and fixed during processing, and then welded or cut; Patent Publication No. CN218592238U discloses a welded pipe positioning and clamping mechanism, which records a telescopic mechanism composed of a second cylinder and a clamping arc plate, and cooperates with a positioning shell to clamp the welded pipe. In addition, a telescopic structure composed of a first cylinder and a connecting frame can be used to move two welded pipes closer to each other. In addition, a driving motor for facilitating the rotation of the welded pipe is also provided, so that the welded pipe can be rotated during the welding process to improve the convenience of welding; However, in the use of the above prior art, it cannot ensure the precise docking of two welded pipes. The reason is that the length of the welded pipe may be relatively long. If only one end of the welded pipe is clamped by the clamping arc plate and the positioning shell, the other end is likely to bend downward under the action of gravity, and thus it cannot be ensured that the two welded pipes can be precisely docked after approaching each other; In addition, since the above prior art is provided with two driving motors, two driving motors are required to drive two welded pipes to rotate synchronously. If the two driving motors malfunction and the two welded pipes cannot rotate synchronously, the smooth progress of the welding process of the welded pipes cannot be ensured; Therefore, a clamping and positioning mechanism for high-frequency welded pipes is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a clamping and positioning mechanism for high-frequency welded pipes to solve the problems in the above background art that the existing clamping and positioning mechanism for high-frequency welded pipes cannot ensure the precise docking of two welded pipes and cannot ensure the synchronous rotation of two welded pipes.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A clamping and positioning mechanism for high-frequency welded pipes, comprising a support table and a limiting rod and a lead screw that are connected to each other in parallel on the support table through protrusions. The upper surface of the support table is provided with a second motor, and the lead screw is connected to the shaft end of the second motor. Two support sleeves are arranged above the support table, and both support sleeves are movably penetrated by the limiting rod. The two support sleeves are also threadedly penetrated by the lead screw, and a centering clamping assembly is installed on each support sleeve. Two threads with opposite helix directions are arranged on the lead screw, and the two threads are respectively threadedly connected to the two support sleeves. The upper surface of the support table is also connected with a centering support assembly, and the centering support assembly is connected through a hydraulic connection assembly. An installation groove is opened on the support table, and the installation groove is connected to the centering clamping assembly through a transmission assembly.

[0005] Preferably, the centering clamping assembly includes clamping cylinders arranged inside each support sleeve, and the outer side of the clamping cylinder is connected to the inner side of the corresponding support sleeve through bearings. Three support pipes are equiangularly distributed inside the clamping cylinder, and one end of a support block extends into the inner side of the open end of the support pipe. The other end of the support block is provided with an arc-shaped support plate.

[0006] Preferably, the centering clamping assembly further includes limiting grooves equiangularly arranged on the opposite sides of the two support sleeves. The support block is provided with a first inclined groove penetrating through both sides thereof. The support pipe is provided with strip-shaped holes that are parallel to each other and penetrate through the inner and outer sides thereof, and the positions of the strip-shaped holes correspond to the positions of the first inclined groove. The corresponding strip-shaped hole and the first inclined groove are movably penetrated by the middle part of the corresponding first H-shaped rod. An activity disk is arranged inside the clamping cylinder, and a spherical protrusion coaxial with the support pipe is arranged on the side of the activity disk facing the support pipe. The first H-shaped rods are equiangularly connected to the side of the activity disk provided with the spherical protrusion, and the first H-shaped rods are also equiangularly connected to a support ring. Limiting blocks are equiangularly distributed on the support ring, and the limiting blocks movably extend into the corresponding limiting grooves for setting.

[0007] Preferably, the centering support assembly includes a sunken groove arranged on the upper surface of the support table, and one end of an activity frame movably extends into the sunken groove. The other end of the activity frame supports a roller support seat.

[0008] Preferably, the centering support assembly further includes connection blocks arranged on both sides of the activity frame, and the connection blocks are provided with second inclined grooves penetrating through both sides thereof. Each second inclined groove is movably penetrated by a corresponding second H-shaped rod.

[0009] Preferably, the first inclined grooves and the second inclined grooves on the same side are arranged in an eight-shaped manner, and the two first inclined grooves and the two second inclined grooves are also arranged in an eight-shaped manner.

[0010] Preferably, the hydraulic connection assembly includes two sets of mounting blocks fixedly connected to the upper surface of the support table. Each of the second H-shaped rods is connected to a corresponding T-shaped flat rod, and a secondary piston rod coaxial with it is connected to the flat rod. Above the support table, there are two flat tubes, and the opposite ends of the two flat tubes are both connected through secondary piston tubes. The inner side of the open end of the secondary piston tube is in seamless sliding connection with the piston end of the corresponding secondary piston rod. The flat rod and the flat tube are respectively connected to the corresponding mounting blocks in a manner of movably penetrating and fixedly penetrating.

[0011] Preferably, the hydraulic connection assembly further includes a primary piston rod coaxially arranged on the movable disc, and a spring is arranged between the movable disc and the inner end of the clamping cylinder. On the outer side of each clamping cylinder, there is a primary piston tube coaxial with it. After the primary piston rod penetrates the inner end of the clamping cylinder, it is in seamless sliding connection with the inner side of the corresponding primary piston tube. The primary piston tube is connected through a liquid guide hose to the corresponding flat tube in a penetrating manner.

[0012] Preferably, the inner diameter of the primary piston tube is the same as that of the secondary piston tube.

[0013] Preferably, the transmission assembly includes a transmission rod connected by a bearing in the installation groove, and belt transmission mechanisms I are connected to both ends of the transmission rod. The driving disc at the upper end of the belt transmission mechanism I is movably penetrated by the corresponding flat tube. On the driving disc at the upper end of the belt transmission mechanism I, connecting tubes are connected at equal angles. The driving disc at the upper end of the belt transmission mechanism I is connected by a bearing to the upper end of the corresponding support frame, and the lower end of the support frame is supported on the upper surface of the support table. In the open end of each connecting tube, a corresponding connecting rod movably extends in. The connecting rods are distributed at equal angles on the side of the clamping cylinder where the primary piston tube is arranged. A motor I is also installed on the support table, and the motor I is connected to the transmission rod through a belt transmission mechanism II.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The clamping and positioning mechanism for high-frequency welded pipes can not only clamp the welded pipes, but also support the ends of the two welded pipes to be welded, thus avoiding the problem that the welded ends of the welded pipes bend downward due to gravity, so as to ensure the accuracy of the butt joint of the two welded pipes. In addition, it can also ensure the synchronous rotation of the two welded pipes, thus ensuring the smooth progress of the welding process: 1. By driving the screw rod to rotate through the motor II, and then cooperating with the limit rod, the two support sleeves drive the two clamping cylinders to approach each other. After one end of the welded pipe is supported on the spherical protrusion in the clamping cylinder, the two clamping cylinders approaching each other drive the two welded pipes to approach each other until the two welded pipes are butted. After that, the two clamping cylinders continue to approach each other, and the movable disc will move relative to the clamping cylinder, so that the first H-shaped rod can move relative to the first inclined groove. During this process, the opposite arc-shaped support plates approach each other, thereby realizing the clamping and fixing of the end of the welded pipe extending into the clamping cylinder. 2. During the process of the movable disk moving relative to the clamping cylinder, it will also cause the primary piston rod to move into the primary piston tube. At this time, the hydraulic oil in the primary piston tube will pass through the liquid guide hose and the flat tube in sequence and then enter the secondary piston tube. The hydraulic oil entering the secondary piston tube will increase the pressure inside it, causing the secondary piston rod to drive the flat rod to move, so as to achieve the purpose of the second H-shaped rod moving relative to the second inclined groove. At this time, the structure composed of the roller support seat and the movable frame will move upward, which is convenient for supporting the welding end of the welded pipe and ensuring that the welding end of the welded pipe will not bend downward due to its own gravity. 3. The structure composed of the connecting rod and the connecting pipe will not affect the movement of the clamping cylinder relative to the first belt transmission mechanism, and can ensure that when the first belt transmission mechanism rotates, it drives the clamping cylinder to rotate synchronously. Therefore, the structure composed of two first belt transmission mechanisms and a transmission rod can make the two clamping cylinders rotate synchronously, which is helpful to ensure the synchronous rotation of the two welded pipes and is conducive to the smooth progress of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view structural schematic diagram of the present invention; Figure 2 is a rear view structural schematic diagram of the present invention; Figure 3 is a sectional view structural schematic diagram of the present invention; Figure 4 is of the present invention Figure 3 an enlarged structural schematic diagram of point A therein; Figure 5 is of the present invention Figure 3 an enlarged structural schematic diagram of point B therein; Figure 6 is a partial sectional view structural schematic diagram of the present invention; Figure 7 is a connection structural schematic diagram of the first belt transmission mechanism and the first motor of the present invention; Figure 8 is a connection structural schematic diagram of the primary piston rod and the support ring of the present invention; Figure 9 is a connection structural schematic diagram of the clamping cylinder and the first belt transmission mechanism of the present invention; Figure 10 is of the present invention Figure 9 an enlarged structural schematic diagram of point C therein.

[0016] In the figure: 1, support platform; 2, limiting rod; 3, lead screw; 4, support sleeve; 5, clamping cylinder; 6, connecting rod; 7, connecting pipe; 8, first belt drive mechanism; 9, support frame; 10, flat pipe; 11, secondary piston pipe; 12, roller support seat; 13, first motor; 14, second belt drive mechanism; 15, second motor; 16, primary piston pipe; 17, liquid guide hose; 18, movable frame; 19, transmission rod; 20, movable disc; 21, spring; 22, primary piston rod; 23, spherical projection; 24, mounting block; 25, limiting block; 26, secondary piston rod; 27, support ring; 28, limiting groove; 29, first H-shaped rod; 30, first inclined groove; 31, arc-shaped support plate; 32, support pipe; 33, connecting block; 34, second inclined groove; 35, second H-shaped rod; 36, flat rod; 37, recessed groove; 38, mounting groove; 39, strip-shaped hole; 40, support block. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 - 10 , the present invention provides the following technical solutions: Embodiment 1: To solve the problem that after the clamping and positioning mechanism of the conventional high-frequency welded pipe clamps one end of the welded pipe, the other end is likely to bend downward due to gravity, the following technical solutions are provided. Specifically, a clamping and positioning mechanism for high-frequency welded pipes includes a support platform 1 and two parallel limiting rods 2 and a lead screw 3 connected to it through protrusions. The upper surface of the support platform 1 is equipped with a second motor 15, and the lead screw 3 is connected to the shaft end of the second motor 15. Above the support platform 1, there are two support sleeves 4, and both of the two support sleeves 4 are movably penetrated by the limiting rod 2. The two support sleeves 4 are also threadedly penetrated by the lead screw 3, and a centering clamping assembly is installed on each support sleeve 4. There are two threads with opposite thread directions on the lead screw 3, and the two threads are respectively threadedly connected to the two support sleeves 4. The upper surface of the support platform 1 is also connected with a centering support assembly, and the centering support assembly is connected through a hydraulic connection assembly.

[0019] The centering clamping assembly includes clamping cylinders 5 provided inside each support sleeve 4, and the outer side of the clamping cylinder 5 is connected to the inner side of the corresponding support sleeve 4 by bearings. Three support tubes 32 are equiangularly distributed inside the clamping cylinder 5, and one end of a support block 40 extends into the inner side of the open end of the support tube 32. An arc-shaped support plate 31 is provided at the other end of the support block 40. The centering clamping assembly further includes limit grooves 28 equiangularly provided on the opposite sides of the two support sleeves 4. An inclined groove 30 penetrating both sides thereof is provided on the support block 40. Parallel strip-shaped holes 39 penetrating the inner and outer sides thereof are provided on the support tube 32, and the positions of the strip-shaped holes 39 correspond to the positions of the inclined groove 30. The corresponding strip-shaped holes 39 and inclined groove 30 are movably penetrated by the middle part of the corresponding first H-shaped rod 29. An active disk 20 is provided inside the clamping cylinder 5, and a spherical protrusion 23 coaxial with it is provided on the side of the active disk 20 facing the support tube 32. The first H-shaped rod 29 is equiangularly connected to the side of the active disk 20 provided with the spherical protrusion 23, and the first H-shaped rod 29 is also equiangularly connected to a support ring 27. Limit blocks 25 are equiangularly distributed on the support ring 27, and the limit blocks 25 are movably extended into the corresponding limit grooves 28 for setting.

[0020] According to Figures 3 - 4 and Figures 8 - 10 , first insert one end of the welded pipe into the inside of the clamping cylinder 5 and support it on the spherical protrusion 23. Then start the second motor 15 to drive the two clamping cylinders 5 to approach each other under the action of the limit rod 2 and the lead screw 3. The two clamping cylinders 5 approach each other, driving the two welded pipes to approach each other until the to-be-welded ends of the two welded pipes come into contact. At this time, the two clamping cylinders 5 continue to approach each other. However, since the two welded pipes have come into contact, they no longer move with the clamping cylinders 5. Although the two clamping cylinders 5 continue to approach each other, they will not cause the two welded pipes to continue to move. Instead, they will relatively cause the active disk 20 to move relative to the clamping cylinder 5, and further drive the first H-shaped rod 29 to move relative to the support tube 32 and the support block 40 provided on the clamping cylinder 5, so that the first H-shaped rod 29 can move on the inclined groove 30 and the strip-shaped hole 39, so as to promote the support block 40 to move on the support tube 32. During this process, the opposite arc-shaped support plates 31 will approach each other, so that the end of the welded pipe inserted into the clamping cylinder 5 can be clamped.

[0021] The hydraulic connection assembly includes two sets of mounting blocks 24 fixedly connected to the upper surface of the support platform 1. Each H-shaped rod two 35 is connected with a corresponding T-shaped flat rod 36, and a secondary piston rod 26 coaxial with it is connected to the flat rod 36. Two flat tubes 10 are arranged above the support platform 1, and the opposite ends of the two flat tubes 10 are both connected through a secondary piston tube 11. The inner side of the open end of the secondary piston tube 11 is in seamless sliding connection with the piston end of the corresponding secondary piston rod 26. The flat rod 36 and the flat tube 10 are respectively connected to the corresponding mounting block 24 in a manner of moving through and fixedly passing through. The hydraulic connection assembly also includes a primary piston rod 22 coaxially arranged on the movable disk 20, and a spring 21 is arranged between the movable disk 20 and the inner end of the clamping cylinder 5. The outer side of each clamping cylinder 5 is provided with a primary piston tube 16 coaxial with it, and the primary piston rod 22 passes through the inner end of the clamping cylinder 5 and is in seamless sliding connection with the inner side of the corresponding primary piston tube 16. The primary piston tube 16 is connected to the corresponding flat tube 10 through a liquid guide hose 17. The inner diameter of the primary piston tube 16 is the same as that of the secondary piston tube 11.

[0022] According to Figures 3 - 5 , during the process of the movable disk 20 moving relative to the clamping cylinder 5, the movable disk 20 will also drive the primary piston rod 22 to move into the primary piston tube 16, so as to squeeze the hydraulic oil in the primary piston tube 16. The hydraulic oil in the primary piston tube 16 will enter the secondary piston tube 11 through the liquid guide hose 17 and the flat tube 10 in sequence, and make the secondary piston rod 26 in the secondary piston tube 11 move outwards, so as to drive the flat rod 36 to move synchronously.

[0023] The centering support assembly includes a recessed groove 37 arranged on the upper surface of the support platform 1, and one end of the movable frame 18 extends into the recessed groove 37 movably. The other end of the movable frame 18 supports a roller support seat 12. The centering support assembly also includes connection blocks 33 arranged on both sides of the movable frame 18, and inclined grooves two 34 penetrating through both sides of the connection blocks 33 are arranged on the connection blocks 33. Each inclined groove two 34 is movably penetrated by a corresponding H-shaped rod two 35. The inclined grooves one 30 and the inclined grooves two 34 on the same side are arranged in a shape of an eight, and the two inclined grooves one 30 and the two inclined grooves two 34 are also arranged in a shape of an eight.

[0024] According to Figure 3 、 Figure 5 and Figure 7, when the flat rod 36 moves, it can drive the second H-shaped rod 35 to move synchronously, so that the second H-shaped rod 35 moves on the second inclined groove 34, so that the structure formed by the movable frame 18 and the connecting block 33 can drive the roller support seat 12 to move upward, so as to support the end of the welded pipe to be welded (the centers of the three support pipes 32 are connected to form an equilateral triangle, and the highest point of the roller on the roller support seat 12 and the lowest point of the upper surface of the arc-shaped support plate 31 indirectly connected to the support pipe 32 with the opening vertically upward are on the same horizontal plane to ensure the horizontality of the welded pipe), avoiding the downward bending of the end of the welded pipe to be welded due to gravity.

[0025] Embodiment 2: To solve the problem that the clamping and positioning mechanism of the conventional high-frequency welded pipe requires two servo motors to drive two welded pipes to rotate respectively, resulting in a speed difference during the rotation of the two welded pipes, and further causing the welding process to be unable to proceed smoothly, the following technical solution is provided. Specifically, an installation groove 38 is formed on the support table 1, and the installation groove 38 is connected to the centering clamping assembly through a transmission assembly.

[0026] The transmission assembly includes a transmission rod 19 bearing-connected in the installation groove 38, and belt transmission mechanisms 8 are connected to both ends of the transmission rod 19. The driving disks at the upper ends of the belt transmission mechanisms 8 are movably penetrated by the corresponding flat pipes 10, and connecting pipes 7 are connected to the driving disks at the upper ends of the belt transmission mechanisms 8 at equal angles. The driving disks at the upper ends of the belt transmission mechanisms 8 are bearing-connected to the upper ends of the corresponding support frames 9, and the lower ends of the support frames 9 are supported on the upper surface of the support table 1. A corresponding connecting rod 6 movably extends into the opening end of each connecting pipe 7, and the connecting rods 6 are distributed at equal angles on one side of the clamping cylinder 5 provided with the primary piston pipe 16. A motor 13 is also installed on the support table 1, and the motor 13 is connected to the transmission rod 19 through a belt transmission mechanism 2 14.

[0027] According to the figure Figure 3 、 Figure 6 and Figure 7 , start the motor 13, the motor 13 drives the transmission rod 19 to rotate through the belt transmission mechanism 2 14, and then can drive the two clamping cylinders 5 to rotate synchronously through the two belt transmission mechanisms 8 and the connecting rods 6 and the connecting pipes 7, ensuring that the two welded pipes can rotate stably and synchronously, and avoiding the welding from being unable to proceed smoothly due to the speed difference in their rotation during the welding process.

[0028] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping and positioning mechanism for high-frequency welded pipes, comprising a support table (1) and parallel limiting rods (2) and lead screws (3) connected to the support table through protrusions, characterized in that: The upper surface of the support table (1) is provided with a second motor (15), and the lead screw (3) is connected to the shaft end of the second motor (15). Above the support table (1), there are two support sleeves (4) provided, and both support sleeves (4) are movably penetrated by the limiting rod (2). Both support sleeves (4) are also threadedly penetrated by the lead screw (3), and a centering clamping assembly is installed on each support sleeve (4). The lead screw (3) is provided with two threads with opposite helix directions, and the two threads are respectively threadedly connected to the two support sleeves (4). The upper surface of the support table (1) is also connected with a centering support assembly, and the centering support assembly is connected through a hydraulic connection assembly. An installation groove (38) is formed on the support table (1), and the installation groove (38) is connected to the centering clamping assembly through a transmission assembly.

2. The clamping and positioning mechanism for high-frequency welded pipes according to claim 1, wherein: The centering clamping assembly includes a clamping cylinder (5) provided inside each support sleeve (4), and the outer side of the clamping cylinder (5) is connected to the inner side of the corresponding support sleeve (4) by a bearing. Inside the clamping cylinder (5), three support pipes (32) are equiangularly distributed, and one end of a support block (40) extends into the inner side of the open end of the support pipe (32). The other end of the support block (40) is provided with an arc-shaped support plate (31).

3. The clamping and positioning mechanism for high-frequency welded pipes according to claim 2, characterized in that: The centering clamping assembly further includes limiting grooves (28) equiangularly arranged on the opposite sides of the two support sleeves (4). The support block (40) is provided with an inclined groove one (30) penetrating through its two sides. The support pipe (32) is provided with strip-shaped holes (39) parallel to each other and penetrating through its inner and outer sides, and the positions of the strip-shaped holes (39) correspond to the positions of the inclined groove one (30). The corresponding strip-shaped holes (39) and inclined groove one (30) are movably penetrated by the middle part of a corresponding H-shaped rod one (29). Inside the clamping cylinder (5), a movable disk (20) is provided, and a spherical protrusion (23) coaxial with it is arranged on the side of the movable disk (20) facing the support pipe (32). The H-shaped rod one (29) is equiangularly connected to the side of the movable disk (20) provided with the spherical protrusion (23), and the H-shaped rod one (29) is also equiangularly connected to a support ring (27). The support ring (27) is equiangularly provided with limiting blocks (25), and the limiting blocks (25) are movably extended into the corresponding limiting grooves (28).

4. The clamping and positioning mechanism for high-frequency welded pipes according to claim 3, characterized in that: The centering support assembly includes a recessed groove (37) formed on the upper surface of the support table (1), and one end of a movable frame (18) is movably extended into the recessed groove (37). The other end of the movable frame (18) supports a roller support seat (12).

5. The clamping and positioning mechanism for high-frequency welded pipes according to claim 4, characterized in that: The centering support assembly further includes connection blocks (33) provided on both sides of the movable frame (18), and the connection blocks (33) are provided with inclined grooves two (34) penetrating through their two sides. Each inclined groove two (34) is movably penetrated by a corresponding H-shaped rod two (35).

6. The clamping and positioning mechanism for high-frequency welded pipes according to claim 5, wherein: The inclined groove one (30) and the inclined groove two (34) on the same side are arranged in an eight-shaped manner, and the two inclined groove ones (30) and the two inclined groove twos (34) are also arranged in an eight-shaped manner.

7. The clamping and positioning mechanism for high-frequency welded pipes according to claim 6, wherein: The hydraulic connection assembly includes two sets of mounting blocks (24) fixedly connected to the upper surface of the support platform (1). Each H-shaped rod two (35) is connected with a corresponding T-shaped flat rod (36), and a secondary piston rod (26) coaxial with it is connected to the flat rod (36). Above the support platform (1), there are two flat tubes (10), and the opposite ends of the two flat tubes (10) are both connected through a secondary piston tube (11) in a penetrating manner. The inner side of the open end of the secondary piston tube (11) is in seamless sliding connection with the piston end of the corresponding secondary piston rod (26). The flat rod (36) and the flat tube (10) are respectively connected to the corresponding mounting block (24) in a manner of movably penetrating and fixedly penetrating.

8. A clamping and positioning mechanism for high-frequency welded pipes according to claim 7, characterized in that: The hydraulic connection assembly further includes a primary piston rod (22) coaxially arranged on the movable disk (20), and a spring (21) is arranged between the movable disk (20) and the inner end of the clamping cylinder (5). The outer side of each clamping cylinder (5) is provided with a primary piston tube (16) coaxial with it. After the primary piston rod (22) penetrates the inner end of the clamping cylinder (5), it is in seamless sliding connection with the inner side of the corresponding primary piston tube (16). The primary piston tube (16) is connected to the corresponding flat tube (10) through a liquid guide hose (17) in a penetrating manner.

9. The clamping and positioning mechanism for high-frequency welded pipes according to claim 8, characterized in that: The inner diameter of the primary piston tube (16) is the same as that of the secondary piston tube (11).

10. The clamping and positioning mechanism for high-frequency welded pipes according to claim 9, wherein: The transmission assembly includes a transmission rod (19) connected by bearings in the installation groove (38). Both ends of the transmission rod (19) are connected with a belt transmission mechanism one (8). The transmission disk at the upper end of the belt transmission mechanism one (8) is movably penetrated by the corresponding flat tube (10). The transmission disks at the upper end of the belt transmission mechanism one (8) are connected by bearings to the upper ends of the corresponding support frames (9), and the lower ends of the support frames (9) are supported on the upper surface of the support platform (1). The open end of each connecting tube (7) is movably inserted with a corresponding connecting rod (6), and the connecting rods (6) are equally angularly distributed on the side of the clamping cylinder (5) where the primary piston tube (16) is arranged. A motor one (13) is also installed on the support platform (1), and the motor one (13) is connected to the transmission rod (19) through a belt transmission mechanism two (14).

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