A turnover device for H-shaped steel welding

Abstract

This invention relates to the field of steel structure welding auxiliary equipment technology, specifically a flipping device for H-beam welding. It includes a base with a transverse groove. Two sliding seats are slidably arranged within the transverse groove, and rotating tubes pass through opposite sides of each sliding seat. The rotating tubes can rotate on the sliding seats, and C-shaped clamping frames are fixedly connected to opposite ends of each rotating tube. This flipping device for H-beam welding achieves precise clamping and positioning of the flange plates by using positioning clamping frames with L-shaped grooves to fit the right-angled sides of the flange plates. In conjunction with a central clamping plate, the web plate is centered and limited. Furthermore, when the deflection pull plate deflects, it drives the extrusion cam to extrude the auxiliary pressure plate, applying a centering constraint force to the web plate. This ensures that the web plate is positioned transversely at the center of the two flange plates, effectively eliminating assembly misalignment and improving weld joint accuracy and component welding quality.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment for steel structure welding, specifically a turning device for welding H-beams. Background Technology

[0002] H-beams are commonly used load-bearing components in steel structure buildings, bridges, and lifting machinery. Their production process requires assembling two flange plates and one web plate and then welding them together. To obtain good weld quality, H-beam fillet welds often use a ship-shaped welding process, thus requiring a matching flipping device to clamp, position, and rotate the workpiece.

[0003] Existing H-beam welding and flipping devices have several drawbacks: First, the workpiece assembly and positioning accuracy is low. The alignment of the flange and web plate relies heavily on manual adjustment, making it difficult to ensure that the web plate is precisely centered laterally on the flange plate. The right-angled sides of the flange plate lack reliable contour positioning structures, which can easily lead to assembly misalignment, reducing the welding accuracy and structural strength of the components. Second, the positioning and clamping mechanisms and the flipping drive mechanisms are independent of each other, resulting in redundant equipment structures. The workpiece needs to be clamped multiple times to complete the positioning and flipping process, making the operation cumbersome and reducing production efficiency. Third, the angle locking stability after flipping is insufficient. During the welding process, the workpiece is prone to angle deflection due to vibration, making it impossible to continuously maintain the optimal posture for ship-shaped welding, resulting in unstable weld formation quality. In addition, most devices are difficult to quickly adapt to H-beams of different lengths and cross-sectional specifications, and the clamping spacing and positioning dimensions are inconvenient to adjust, resulting in poor equipment versatility. Summary of the Invention

[0004] The purpose of this invention is to provide a turning device for welding H-beams, so as to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a turning device for welding H-beams, including a base, a transverse sliding groove on the base, two sliding seats slidably disposed in the transverse sliding groove, a rotating tube passing through one side of each of the two sliding seats, the rotating tube being rotatable on the sliding seat, and a C-shaped clamping frame fixedly connected to one end of each of the two rotating tubes; The inner wall of the C-shaped card frame has vertical sliding card frames on both the upper and lower sides. The front and rear sides of the card frames are fixedly connected to telescopic rods. The sides of the telescopic rods are fixedly connected to positioning card frames. The card slots on the inner wall of the positioning card frames are L-shaped and are used to fit the right angle side of the flange plate. The four positioning frames on the same side are all hinged with deflection pull plates on their upper and lower opposite sides. The four deflection pull plates are in pairs, and each set of deflection pull plates has a middle plate hinged to the end away from the positioning frame. The middle plate is used to position the web plate. Auxiliary pressure plates are inserted on both the front and rear sides of the central clamping plate. A squeezing cam abuts against one side of the auxiliary pressure plate. The squeezing cam is eccentrically fixed and sleeved on the end of the deflection pull plate facing the central clamping plate. When the central clamping plate moves and drives the deflection pull plate to deflect, the squeezing cam squeezes the auxiliary pressure plate, causing the auxiliary pressure plate to press inward against the web plate on the inner side of the central clamping plate, ensuring that the web plate is in the transverse middle position of the two flange plates.

[0005] Preferably, the left sliding seat is fixed in the transverse slide groove by bolts, and the right side of the right sliding seat is fixedly installed with a first cylinder, which is installed on the right end of the inner wall of the transverse slide groove.

[0006] Preferably, a rotating shaft runs through the vertical plate of the C-shaped card frame, and the rotating shaft 8 is located at the central axis inside the rotating tube 5. A gear is movably sleeved on one end of the rotating shaft facing the central card plate. A cylinder is fixedly connected to the end face of the gear, and the cylinder is movably sleeved on the side of the rotating shaft. Multiple damping spring telescopic rods are hinged inside the cylinder. The end of the damping spring telescopic rod away from the cylinder is hinged to the rotating shaft, and the damping spring telescopic rod is inclined. The gear has two toothed plates that mesh in a staggered manner on both sides. The toothed plates have grooves on their sides and slide on the fixed plate fixed to the side of the C-shaped frame through the grooves. The two toothed plates on the same side are respectively fixedly connected to the two corresponding middle plates. A worm gear is fixedly sleeved at the end of the rotating shaft away from the gear. A worm is meshed on the worm gear, and a bidirectional motor is connected to one end of the worm. The bidirectional motor is mounted on a sliding seat.

[0007] Preferably, a rectangular groove is provided on the outer wall of the cylinder, a locking block is inserted in the rectangular groove, a protrusion is provided on the side of the locking block facing away from the central axis of the cylinder, and an eccentric cam is abutted on the side of the locking block facing the central axis of the cylinder. The eccentric cam is eccentrically fixedly sleeved on the end of the damping spring telescopic rod that is hinged to the cylinder. A fixed sleeve is movably fitted on the outer side of the cylinder. The fixed sleeve is fixed inside the C-shaped frame. The cylinder can only rotate inside the fixed sleeve. A locking groove is provided on the inner wall of the fixed sleeve to lock in place with the protrusion.

[0008] Preferably, a convex pressure plate is slidably arranged inside the cylinder, and the convex pressure plate is movably sleeved on the rotating shaft. A spring telescopic rod is fixedly connected to the side of the convex pressure plate facing the inner wall of the cylinder, and the end of the spring telescopic rod away from the convex pressure plate is fixed to the inner wall of the cylinder. Multiple circumferentially arranged arc-shaped protrusions are fixedly connected to the side of the convex pressure plate facing the inner wall of the cylinder. The number of arc-shaped protrusions is equal to the number of damping spring telescopic rods and their positions correspond one-to-one. The side of the convex pressure plate facing away from the inner wall of the cylinder faces the C-shaped frame, and a mating groove that mates with the convex pressure plate is opened in the C-shaped frame.

[0009] Preferably, a second cylinder is fixedly connected to each of the two sliding seats, and a limit plate is fixedly connected to one end of the second cylinder, with the limit plate abutting against the C-shaped frame.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention offers high assembly positioning accuracy, ensuring welding quality. The device uses a positioning frame with an L-shaped slot to fit the right-angled side of the flange plate, achieving precise clamping and positioning. In conjunction with the central clamping plate, the web plate is centered and limited. Furthermore, when the deflection pull plate deflects, it drives the extrusion cam to extrude the auxiliary pressure plate, applying a centering constraint force to the web plate. This ensures the web plate is positioned laterally at the center of the two flange plates, effectively eliminating assembly misalignment and improving weld joint accuracy and component welding quality.

[0011] This invention uses a bidirectional motor as a power source, which, after being driven by a worm gear, sequentially completes three consecutive actions: clamping and assembling the flange and web plate, triggering the locking mechanism, and flipping the workpiece as a whole. The entire process of assembly and positioning, spot welding pre-fixing, and multi-pass ship-shaped welding can be completed in one clamping of the workpiece, greatly reducing the auxiliary time of repeated clamping.

[0012] This invention features a double-locking structure for stable and reliable flipping posture. After the workpiece is assembled, the damping spring telescopic rod continues to deflect with the rotating shaft. On one hand, it drives the eccentric cam to push the locking block into the locking groove of the fixed sleeve. On the other hand, it pushes the arc-shaped convex plate into the docking groove of the C-shaped card frame, forming a double lock and making the C-shaped card frame rigidly connected to the transmission system. After flipping to the ship welding angle, there is no relative movement, which can stably maintain the welding posture and avoid workpiece displacement during welding.

[0013] This invention features strong adaptability to specifications and convenient adjustment operation. The right sliding seat is driven by the first cylinder to move along the transverse slide groove, which can quickly adjust the clamping distance at both ends to accommodate H-beam workpieces of different lengths. The placement frame can slide vertically along the C-shaped frame, and combined with the telescopic structure of the positioning frame driven by the telescopic rod, it can accommodate flanges and webs with different cross-sectional heights and thicknesses, making the equipment widely applicable. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the card frame, telescopic rod, and positioning card frame of the present invention; Figure 3 This is a three-dimensional structural diagram of the worm gear and bidirectional motor of the present invention; Figure 4 This is a three-dimensional structural diagram of the rotating shaft, gear, and toothed plate of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the C-shaped card frame of the present invention; Figure 6 This is a three-dimensional structural diagram of the convex pressure plate and the cylinder in the separated state of the present invention; Figure 7This is a three-dimensional cross-section of the cylinder and the fixed sleeve of the present invention. Figure 1 ; Figure 8 This is a three-dimensional cross-section of the cylinder and the fixed sleeve of the present invention. Figure 2 ; Figure 9 This is a three-dimensional structural diagram of the deflection pull plate and the central clamping plate of the present invention.

[0015] In the diagram: 1. Base; 2. Horizontal slide groove; 3. Sliding seat; 4. First cylinder; 5. Rotating tube; 6. C-shaped clamping frame; 7. Placing clamping frame; 71. Telescopic rod; 72. Positioning clamping frame; 73. Deflection pull plate; 74. Central clamping plate; 75. Auxiliary pressure plate; 76. Extrusion cam; 8. Rotating shaft; 81. Gear; 82. Gear plate; 83. Worm gear; 84. Worm; 85. Bidirectional motor; 86. Slide groove; 87. Fixing plate; 88. Cylinder; 89. Damping spring telescopic rod; 9. Locking block; 91. Eccentric cam; 92. Fixing sleeve; 93. Protrusion; 94. Locking groove; 10. Convex pressure plate; 11. Arc-shaped convex plate; 12. Spring telescopic rod; 13. Second cylinder; 14. Limiting plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1 to 9 The present invention provides a technical solution: a flipping device for welding H-beams, including a base 1, a transverse sliding groove 2 is provided on the base 1, and two sliding seats 3 are slidably arranged in the transverse sliding groove 2. The left sliding seat 3 is fixed in the transverse sliding groove 2 by bolts, and a first cylinder 4 is fixedly installed on the right side of the right sliding seat 3. The first cylinder 4 is installed on the right end of the inner wall of the transverse sliding groove 2. A rotating tube 5 passes through each of the two sliding seats 3 on opposite sides. The rotating tube 5 can rotate on the sliding seat 3. A C-shaped card frame 6 is fixedly connected to each of the two rotating tubes 5 at opposite ends. A placement card frame 7 is vertically slidably arranged on the upper and lower sides of the inner wall of the C-shaped card frame 6. A telescopic rod 71 is fixedly connected to the front and rear sides of the placement card frame 7. A positioning card frame 72 is fixedly connected to the side of the telescopic rod 71. The card groove on the inner wall of the positioning card frame 72 is L-shaped to fit the right angle side of the flange plate. On the same side, the four positioning frames 72 are all hinged to opposite sides in the vertical direction with deflection pull plates 73. The four deflection pull plates 73 are in groups of two. The end of the two deflection pull plates 73 away from the positioning frame 72 is hinged to a middle plate 74. The middle plate 74 is used to position the web plate.

[0018] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, auxiliary pressure plates 75 are inserted on both the front and rear sides of the central clamping plate 74. A pressing cam 76 abuts against one side of each auxiliary pressure plate 75. The pressing cam 76 is eccentrically fixed onto the end of the deflection pull plate 73 facing the central clamping plate 74. When the central clamping plate 74 moves and the deflection pull plate 73 deflects, it cooperates with the pressing cam 76 to press the auxiliary pressure plates 75, causing the auxiliary pressure plates 75 to press against the web plate located inside the central clamping plate 74. This keeps the central clamping plate 74 in a centered position, ensuring that the upper and lower sides of the web plate are located at the lateral center of the two flange plates, thereby ensuring the quality of subsequent welding of the flange plates and web plates. In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, a rotating shaft 8 passes through the vertical plate of the C-shaped card frame 6, and the rotating shaft 8 is located at the central axis inside the rotating tube 5. A gear 81 is movably sleeved on the end of the rotating shaft 8 facing the central card plate 74. A cylinder 88 is fixedly connected to the end face of the gear 81, and the cylinder 88 is movably sleeved on the side of the rotating shaft 8. Multiple damping spring telescopic rods 89 are hinged inside the cylinder 88. The end of the damping spring telescopic rod 89 away from the cylinder 88 is hinged to the rotating shaft 8, and the damping spring telescopic rod 89 is inclined. The elastic force of the multiple damping spring telescopic rods 89 ensures that after the rotating shaft 8 and the cylinder 88 are relatively deflected, the two are in a relatively stationary state.

[0019] The gear 81 has two toothed plates 82 that are staggered and mesh on both sides. The toothed plates 82 have a sliding groove 86 on their side and are slidably mounted on the fixing plate 87 fixed on the side of the C-shaped frame 6 through the sliding groove 86. The two toothed plates 82 on the same side are respectively fixedly connected to their corresponding two middle clamping plates 74. A worm gear 83 is fixedly sleeved on the end of the rotating shaft 8 away from the gear 81. A worm 84 meshes with the worm gear 83, and one end of the worm 84 is connected to a bidirectional motor 85. The bidirectional motor 85 is mounted on the sliding seat 3.

[0020] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, a rectangular groove is provided on the outer wall of the cylinder 88, and a locking block 9 is inserted in the rectangular groove. A protrusion 93 is provided on the side of the locking block 9 facing away from the central axis of the cylinder 88. An eccentric cam 91 is abutted on the side of the locking block 9 facing the central axis of the cylinder 88. The eccentric cam 91 is eccentrically fixedly sleeved on the end of the damping spring telescopic rod 89 that is hinged to the cylinder 88. The outer side of the cylinder 88 is movably fitted with a fixing sleeve 92, and the fixing sleeve 92 is fixed on the inner side of the C-shaped frame 6. The cylinder 88 can only rotate within the fixing sleeve 92. The inner wall of the fixing sleeve 92 is provided with a locking groove 94 that cooperates with the protrusion 93 for locking.

[0021] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, a convex pressure plate 10 is slidably disposed on the inner circumference of the cylinder 88, and the convex pressure plate 10 is movably sleeved on the rotating shaft 8. A spring telescopic rod 12 is fixedly connected to the side of the convex pressure plate 10 facing the inner wall of the cylinder 88. The end of the spring telescopic rod 12 away from the convex pressure plate 10 is fixed to the inner wall of the cylinder 88. A plurality of circumferentially arranged arc-shaped protrusions 11 are fixedly connected to the side of the convex pressure plate 10 facing the inner wall of the cylinder 88, and the number of arc-shaped protrusions 11 is equal to the number of damping spring telescopic rods 89, and the positions of the two are corresponding. The side of the convex pressure plate 10 facing away from the inner wall of the cylinder 88 faces the C-shaped frame 6, and a mating groove that mates with the convex pressure plate 10 is opened in the C-shaped frame 6.

[0022] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, a second cylinder 13 is fixedly connected to each of the two sliding seats 3. A limit plate 14 is fixedly connected to one end of the second cylinder 13, and the limit plate 14 abuts against the C-shaped frame 6.

[0023] The method of use and advantages of this invention: The working process of this H-beam welding turning device is as follows: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, when the device is in use, firstly, according to the length of the flange plate and the web plate, control the first cylinder 4 to retract, adjust the position of the right sliding seat 3 in the transverse slide groove 2, then place the two flange plates to be welded into the two placement frames 7 at the corresponding heights, and then place the web plate into the four central clamping plates 74 to complete the initial positioning of the two flange plates and one web plate. The bidirectional motor 85 drives the worm gear 84 to rotate, which in turn drives the worm wheel 83 and the rotating shaft 8 to rotate simultaneously. This causes the rotating shaft 8 to press the damping spring telescopic rod 89 and drive the gear 81 to rotate, causing the two toothed plates 82 on the same side to move relative to each other. At this time, the deflection pull plate 73 pulls the positioning frame 72 to move horizontally closer to the placement frame 7 and engages with the corner of the inner flange plate of the placement frame 7. This aligns the transverse axis of the inner flange plate of the placement frame 7 with the transverse axis of the placement frame 7, facilitating subsequent welding operations. Furthermore, during the relative movement of the two central clamping plates 74 on the same side, the positioning clamping frame 72, which is inserted into the corner of the flange plate, is pulled and moved towards the central axis of the rotating tube 5, causing the two flange plates to move towards each other and completely abutting the web plate between them, thus completing the assembly of the two flange plates and the web plate. After the two flange plates and the web plate are assembled, the bidirectional motor 85 drives the rotating shaft 8 to continue to rotate, causing the damping spring telescopic rod 89 to continue to compress and deflect. When the damping spring telescopic rod 89 deflects, it cooperates with the eccentric cam 91 at its end to press the locking block 9, causing the locking block 9 to abut against the locking groove 94 opened in the inner wall of the fixed sleeve 92. During the deflection of the damping spring telescopic rod 89, it presses the arc-shaped protrusion 11 to move in the cylinder 88 and abut against the docking groove on the inner side of the C-shaped card frame 6, completing the docking of the two and ensuring the stability of the flange plate and the web plate after splicing. At this time, the connection between the flange plate and the web plate after docking is pre-fixed by spot welding using an external welding machine. Then, the second cylinder 13 retracts the limiting plate 14 to separate from the C-shaped frame 6, releasing the limitation plate 14 from the C-shaped frame 6. At this time, the bidirectional motor 85 continues to drive the rotating shaft 8 to rotate, and the C-shaped frame 6 rotates. At the same time, the middle clamping plate 74 and the placement frame 7 rotate 45 degrees along the central axis of the rotating tube 5. The connection between the flange plate and the web plate is welded by an external welding machine. This process is repeated multiple times by the bidirectional motor 85 to sequentially weld the four connection points between the flange plate and the web plate.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flipping device for welding H-beams, comprising a base (1), a transverse sliding groove (2) provided on the base (1), two sliding seats (3) slidably disposed within the transverse sliding groove (2), a rotating tube (5) passing through one side of each of the two sliding seats (3), the rotating tube (5) being rotatable on the sliding seat (3), and a C-shaped clamping frame (6) fixedly connected to one end of each of the two rotating tubes (5), characterized in that: The inner walls of the C-shaped card frame (6) are vertically slidably equipped with card placement frames (7) on both the upper and lower sides. The front and rear sides of the card placement frame (7) are fixedly connected with telescopic rods (71). The sides of the telescopic rods (71) are fixedly connected with positioning card frames (72). The card groove on the inner wall of the positioning card frame (72) is L-shaped and is used to fit the right angle side of the flange plate. The four positioning frames (72) on the same side are hinged with deflection plates (73) on their upper and lower opposite sides. The four deflection plates (73) are in pairs. Each set of deflection plates (73) has a middle plate (74) hinged at the end away from the positioning frame (72). The middle plate (74) is used to position the web plate. Auxiliary pressure plates (75) are inserted on both the front and rear sides of the middle clamping plate (74). A squeezing cam (76) abuts against one side of the auxiliary pressure plate (75). The squeezing cam (76) is eccentrically fixed on the end of the deflection pull plate (73) facing the middle clamping plate (74). When the middle clamping plate (74) moves and drives the deflection pull plate (73) to deflect, the squeezing cam (76) squeezes the auxiliary pressure plate (75), so that the auxiliary pressure plate (75) presses inward against the web plate inside the middle clamping plate (74), ensuring that the web plate is in the middle of the two flange plates in the transverse direction.

2. The turning device for welding H-beams according to claim 1, characterized in that: The left sliding seat (3) is fixed in the transverse slide groove (2) by bolts, and the right side of the right sliding seat (3) is fixedly installed with the first cylinder (4), which is installed on the right end of the inner wall of the transverse slide groove (2).

3. The turning device for welding H-beams according to claim 1, characterized in that: A rotating shaft (8) runs through the vertical plate of the C-shaped card frame (6), and the rotating shaft (8) is located at the central axis inside the rotating tube (5). A gear (81) is movably sleeved on one end of the rotating shaft (8) facing the central card plate (74). A cylinder (88) is fixedly connected to the end face of the gear (81), and the cylinder (88) is movably sleeved on the side of the rotating shaft (8). Multiple damping spring telescopic rods (89) are hinged inside the cylinder (88). The end of the damping spring telescopic rod (89) away from the cylinder (88) is hinged to the rotating shaft (8), and the damping spring telescopic rod (89) is inclined. The gear (81) has two toothed plates (82) meshing on both sides in a staggered manner. The toothed plates (82) have a sliding groove (86) on their side. The toothed plates (82) slide on the fixing plate (87) fixed on the side of the C-shaped card frame (6) through the sliding groove (86). The two toothed plates (82) on the same side are respectively fixedly connected to the two corresponding middle card plates (74). A worm gear (83) is fixedly sleeved at the end of the rotating shaft (8) away from the gear (81). A worm (84) meshes on the worm gear (83). A bidirectional motor (85) is connected to one end of the worm (84). The bidirectional motor (85) is mounted on the sliding seat (3).

4. The turning device for welding H-beams according to claim 3, characterized in that: A rectangular groove is provided on the outer wall of the cylinder (88), and a locking block (9) is inserted in the rectangular groove. A protrusion (93) is provided on the side of the locking block (9) facing away from the central axis of the cylinder (88). An eccentric cam (91) is abutted on the side of the locking block (9) facing the central axis of the cylinder (88). The eccentric cam (91) is eccentrically fixedly sleeved on the end of the damping spring telescopic rod (89) that is hinged to the cylinder (88). A fixed sleeve (92) is movably fitted on the outer side of the cylinder (88). The fixed sleeve (92) is fixed inside the C-shaped frame (6). The cylinder (88) can only rotate inside the fixed sleeve (92). A locking groove (94) is provided on the inner wall of the fixed sleeve (92) to lock in conjunction with the protrusion (93).

5. The turning device for welding H-beams according to claim 3, characterized in that: A convex pressure plate (10) is slidably installed on the inner circumference of the cylinder (88), and the convex pressure plate (10) is movably sleeved on the rotating shaft (8). A spring telescopic rod (12) is fixedly connected to the side of the convex pressure plate (10) facing the inner wall of the cylinder (88). The end of the spring telescopic rod (12) away from the convex pressure plate (10) is fixed on the inner wall of the cylinder (88). A number of circumferentially arranged arc-shaped convex plates (11) are fixedly connected to the side of the convex pressure plate (10) facing the inner wall of the cylinder (88). The number of arc-shaped convex plates (11) is equal to the number of damping spring telescopic rods (89) and their positions correspond one-to-one. The side of the convex pressure plate (10) facing away from the inner wall of the cylinder (88) faces the C-shaped frame (6). A mating groove that mates with the convex pressure plate (10) is opened in the C-shaped frame (6).

6. The turning device for welding H-beams according to claim 1, characterized in that: A second cylinder (13) is fixedly connected to each of the two sliding seats (3). A limit plate (14) is fixedly connected to one end of the second cylinder (13), and the limit plate (14) abuts against the C-shaped frame (6).

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