Centering device for conveying steel pipes

Abstract

The utility model provides a centering device for conveying steel pipes, which comprises a first driving mechanism arranged on a base, a movable end of the first driving mechanism is connected with a two-section joint, the two-section joint is respectively connected with one sides of two groups of connecting plates through third hinge pins, and the other ends of the two groups of connecting plates are respectively connected with a first flat plate and a second flat plate. The first flat plate and the second flat plate are vertically distributed, the middle positions of the first flat plate and the second flat plate are connected with motor shafts, a first roller and a fourth roller are arranged above the two ends of the first flat plate respectively, and a second roller and a third roller are arranged above the two ends of the second flat plate respectively. The second roller is connected with the second gear through a second transmission shaft. The fourth roller is connected with the first gear through a fourth transmission shaft. A motor shaft is connected with the movable end of the second driving mechanism and further provided with a third gear, the third gear is connected with the second gear through a second chain, and the third gear is connected with the first gear through a first chain. The steel pipe centering device solves the problem of how to enable the steel pipe to be automatically centered during transportation in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe transportation, in particular to a centering device for transporting steel pipes. Background Art

[0002] With the continuous development and progress of automation, automated production lines are also developing rapidly. Many assembly lines have replaced manual labor with conveyors for workpiece transportation. Since steel pipes are circular in shape and not easy to fix, their orientation positions in the direction of the assembly line are uncertain, and automated centering cannot be achieved. At this time, manual adjustment is necessarily time-consuming and laborious, and long-distance transportation on the assembly line will still cause the orientation positions of the steel pipes to be disordered.

[0003] Therefore, how to enable the steel pipes in transportation to automatically achieve centering has become a technical problem to be solved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a centering device for transporting steel pipes, mainly to solve the problem of how to enable the steel pipes in transportation to automatically achieve centering existing in the above-mentioned prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a centering device for transporting steel pipes, characterized in that: the centering device for transporting steel pipes includes a base, a first driving mechanism is provided on the base, the movable end of the first driving mechanism is connected to a double-joint, the double-joint is respectively connected to one side of two groups of connecting plates through a third hinge pin, the other ends of the two groups of connecting plates are respectively connected to a first flat plate and a second flat plate, the first flat plate and the second flat plate are distributed up and down and the middle positions of both are connected to a motor shaft, first rollers and fourth rollers are respectively provided above both ends of the first flat plate, second rollers and third rollers are respectively provided above both ends of the second flat plate, the first roller and the second roller correspond, and the third roller and the fourth roller correspond; the second roller is connected to a second gear through a second transmission shaft, and the fourth roller is connected to a first gear through a fourth transmission shaft;

[0006] The motor shaft is connected to the movable end of a second driving mechanism, and a third gear is further provided on the motor shaft, the third gear is connected to the second gear through a second chain, and the third gear is connected to the first gear through a first chain.

[0007] Further, the two groups of connecting plates include a first group of connecting plates connected to the first flat plate and a second group of connecting plates connected to the second flat plate, the first group of connecting plates includes a first connecting plate and a second connecting plate, the rear ends of the first connecting plate and the second connecting plate are both connected to the third hinge pin, the front ends of the first connecting plate and the second connecting plate are both connected to the left side of the first flat plate through a first hinge pin, and the first connecting plate and the second connecting plate are connected through a first connecting block;

[0008] The second set of connecting plates includes a third connecting plate and a fourth connecting plate. The rear ends of the third connecting plate and the fourth connecting plate are both connected to a third hinge pin. The front ends of the third connecting plate and the fourth connecting plate are both connected to the right side of the second flat plate through a second hinge pin. The third connecting plate and the fourth connecting plate are connected to each other through a second connecting block;

[0009] The first flat plate and the second flat plate are connected by a motor shaft and are distributed in an X shape.

[0010] Furthermore, the double-joint is U-shaped. The bottom of the U-shaped double-joint is connected to the movable end of the first driving mechanism. The two sides of the double-joint are respectively an upper connecting part and a lower connecting part;

[0011] The first flat plate is located between the front ends of the first connecting plate and the second connecting plate. The upper connecting part of the double-joint is located between the rear ends of the first connecting plate and the second connecting plate;

[0012] The second flat plate is located between the front ends of the third connecting plate and the fourth connecting plate. The lower connecting part of the double-joint is located between the rear ends of the third connecting plate and the fourth connecting plate.

[0013] Furthermore, a first groove is provided at the upper end of the first hinge pin. The first groove is higher than the top surface of the first connecting plate. A first baffle is provided on the top surface of the first connecting plate, and the first baffle is embedded in the first groove;

[0014] A second groove is provided at the upper end of the second hinge pin. The second groove is higher than the top surface of the third connecting plate. A second baffle is provided on the top surface of the third connecting plate, and the second baffle is embedded in the second groove;

[0015] A third groove is provided at the upper end of the third hinge pin. The third groove is higher than the top surface of the first connecting plate. A third baffle is provided on the top surface of the first connecting plate, and the third baffle is embedded in the third groove.

[0016] Furthermore, the fourth roller is located at the right end of the first flat plate near the front. The bottom of the fourth roller is connected to a fourth transmission shaft. A fourth bearing is provided between the fourth transmission shaft and the first flat plate. The first roller is located at the left end of the first flat plate near the rear. The bottom of the first roller and the first flat plate are connected through a first support shaft;

[0017] The second roller is located at the left end of the second flat plate near the front. The bottom of the second roller is connected to a second transmission shaft. A second bearing is provided between the second transmission shaft and the second flat plate. The third roller is located at the right end of the second flat plate near the rear. The bottom of the third roller and the second flat plate are connected through a third support shaft;

[0018] A first bearing is provided between the motor shaft and the first flat plate. A third bearing is provided between the motor shaft and the second flat plate. A fifth bearing is provided between the motor shaft and the base. The second driving mechanism is located below the base.

[0019] Further, a first long waist hole is provided on the right side of the first flat plate, and a first adjusting shaft for adjusting the tension of the first chain is provided in the first long waist hole;

[0020] A second long waist hole is provided on the left side of the second flat plate, and a second adjusting shaft for adjusting the tension of the second chain is provided in the second long waist hole.

[0021] Further, the second driving mechanism is connected to a fifth connecting plate, and the fifth connecting plate is connected to the base through a third connecting shaft.

[0022] Further, the first driving mechanism includes a square cylinder and a fixing seat. The fixing seat is U-shaped. The rear end of the square cylinder is fixed on the fixing seat through a sixth connecting plate. A first limit screw is provided on each of the fixing seats on the left and right sides of the square cylinder, and a second limit screw is provided on the base directly below the square cylinder.

[0023] Further, covers for blocking the corresponding drums are provided on the tops of the first roller, the second roller, the third roller, and the fourth roller.

[0024] Further, the first flat plate and the second flat plate have the same length, and the distance from the axis of the first hinge pin to the axis of the motor shaft is equal to the distance from the axis of the second hinge pin to the axis of the motor shaft.

[0025] In view of the above technical features, the present utility model has the following beneficial effects:

[0026] 1. A centering device for conveying steel pipes of the present utility model drives the first flat plate and the second flat plate arranged in an X shape to rotate and move around the motor shaft by using the first driving mechanism, so as to clamp and release the steel pipes. When the first flat plate and the second flat plate are in a clamped state, the first roller and the fourth roller of the first flat plate cooperate with the second roller and the third roller of the second flat plate to jointly clamp the steel pipe, so as to achieve the centering purpose. Then, the second driving mechanism drives the motor shaft to rotate, and the motor shaft drives the second roller and the fourth roller to rotate in the same direction by using gears and chains, so as to move the centered steel pipe to one side (such as the left side and / or the right side). During the moving process, the steel pipe always maintains a centered state and will not be out of direction. The whole device is simple to operate, does not require manual centering, reduces the labor requirement, and saves labor costs. Description of the Drawings

[0027] Figure 1 is a structural schematic diagram of a centering device for conveying steel pipes in Specific Embodiment 1 Figure 1 .

[0028] Figure 2 is a structural schematic diagram of a centering device for conveying steel pipes in Specific Embodiment 1 Figure 2 .

[0029] Figure 3It is a side view of a centering device for conveying steel pipes in Specific Embodiment 1.

[0030] Figure 4 It is a schematic structural view of the first driving mechanism connecting the first flat plate and the second flat plate in Specific Embodiment 1 Figure 1 。

[0031] Figure 5 It is a schematic structural view of the first driving mechanism connecting the first flat plate and the second flat plate in Specific Embodiment 1 Figure 2 。

[0032] In the figure: 1, base; 2, first driving mechanism; 3, first limit screw; 4, second limit screw; 5, double-joint; 5-1, upper connecting part; 5-2, lower connecting part; 6, third hinge pin; 6-1, third groove; 7, first connecting plate; 8, first baffle; 9, first hinge pin; 9-1, first groove; 10, first connecting block; 11, first roller; 12, second roller; 13, second connecting plate; 14, third roller; 15, fourth roller; 16, first flat plate; 16-1, first long waist hole; 17, second flat plate; 17-2, second long waist hole; 18, cover plate; 19, second transmission shaft; 20-1, first support shaft; 20-3, third support shaft; 21, motor shaft; 22, fourth bearing; 23, first adjusting shaft; 24, second adjusting shaft; 25, third bearing; 26, fifth bearing; 27, third gear; 28, second gear; 29, first gear; 30-1, first chain; 30-2, second chain; 31, third connecting shaft; 32, fifth connecting plate; 33, second driving mechanism; 34, third connecting plate; 35, fourth connecting plate; 36, second hinge pin; 36-1, second groove; 37, second baffle; 38, second connecting block; 39, third baffle; 40, first bearing; 41, second bearing; 42, fixed seat; 43, fourth transmission shaft. Specific Embodiments

[0033] The following further elaborates on the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0034] See Figures 1 to 5, Specific Embodiment 1. This Embodiment 1 provides a centering device for conveying steel pipes, including a base 1. A first driving mechanism 2 is provided on the base 1. The movable end of the first driving mechanism 2 is connected to a double-joint joint 5. The double-joint joint 5 is U-shaped. The double-joint joint 5 is respectively connected to one side of two groups of connecting plates through a third hinge pin 6. The other ends of the two groups of connecting plates are respectively connected to a first flat plate 16 and a second flat plate 17. The first flat plate 16 and the second flat plate 17 are distributed vertically, and the middle positions of both are connected to a motor shaft 21. At this time, the first flat plate 16 and the second flat plate 17 are connected through the motor shaft 21 and are distributed in an X shape.

[0035] Preferably, the two groups of connecting plates include a first group of connecting plates connecting the first flat plate 16 and a second group of connecting plates connecting the second flat plate 17. The first group of connecting plates includes a first connecting plate 7 and a second connecting plate 13. The rear ends of the first connecting plate 7 and the second connecting plate 13 are both connected to the third hinge pin 6. The front ends of the first connecting plate 7 and the second connecting plate 13 are both connected to the left side of the first flat plate 16 through a first hinge pin 9. The first connecting plate 7 and the second connecting plate 13 are connected through a first connecting block 10.

[0036] The second group of connecting plates includes a third connecting plate 34 and a fourth connecting plate 35. The rear ends of the third connecting plate 34 and the fourth connecting plate 35 are both connected to the third hinge pin 6. The front ends of the third connecting plate 34 and the fourth connecting plate 35 are both connected to the right side of the second flat plate 17 through a second hinge pin 36. The third connecting plate 34 and the fourth connecting plate 35 are connected through a second connecting block 38.

[0037] The bottom of the U-shaped double-joint joint 5 is connected to the movable end of the first driving mechanism 2. The two sides of the double-joint joint 5 are respectively an upper connecting part 5-1 and a lower connecting part 5-2; the first flat plate 16 is located between the front ends of the first connecting plate 7 and the second connecting plate 13, and the upper connecting part 5-1 of the double-joint joint 5 is located between the rear ends of the first connecting plate 7 and the second connecting plate 13; the second flat plate 17 is located between the front ends of the third connecting plate 34 and the fourth connecting plate 35, and the lower connecting part 5-2 of the double-joint joint 5 is located between the rear ends of the third connecting plate 34 and the fourth connecting plate 35.

[0038] Preferably, a first groove 9-1 is provided at the upper end of the first hinge pin 9. The first groove 9-1 is higher than the top surface of the first connecting plate 7. A first baffle 8 is provided on the top surface of the first connecting plate 7. The first baffle 8 is embedded in the first groove 9-1 for fixing the first hinge pin 9.

[0039] A second groove 36-1 is provided at the upper end of the second hinge pin 36. The second groove 36-1 is higher than the top surface of the third connecting plate 34. A second baffle 37 is provided on the top surface of the third connecting plate 34. The second baffle 37 is embedded in the second groove 36-1 for fixing the second hinge pin.

[0040] The upper end of the third hinge pin 6 is provided with a third groove 6-1, and the third groove 6-1 is higher than the top surface of the first connecting plate 7. A third baffle 39 is provided on the top surface of the first connecting plate 7, and the third baffle 39 is embedded in the third groove 6-1 for fixing the third hinge pin.

[0041] Above the two ends of the first flat plate 16, a first roller 11 and a fourth roller 15 are respectively provided. Above the two ends of the second flat plate 17, a second roller 12 and a third roller 14 are respectively provided. The first roller 11 and the second roller 12 correspond to each other, and the third roller 14 and the fourth roller 15 correspond to each other. The second roller 12 is connected to the second gear 28 through the second transmission shaft 19, and the fourth roller 15 is connected to the first gear 29 through the fourth transmission shaft 43. The motor shaft 21 is connected to the movable end of the second driving mechanism 33. A third gear 27 is further provided on the motor shaft 21. The third gear 27 is connected to the second gear 28 through the second chain 30-2, and the third gear 27 is connected to the first gear 29 through the first chain 30-1.

[0042] The fourth roller 15 is located at the front right end of the first flat plate 16. The bottom of the fourth roller 15 is connected to the fourth transmission shaft 43. A fourth bearing 22 is provided between the fourth transmission shaft 43 and the first flat plate 16. The first roller 11 is located at the rear left end of the first flat plate 16, and the bottom of the first roller 11 is connected to the first flat plate 16 through the first support shaft 20-1.

[0043] The second roller 12 is located at the front left end of the second flat plate 17. The bottom of the second roller 12 is connected to the second transmission shaft 19. A second bearing 41 is provided between the second transmission shaft 19 and the second flat plate 17. The third roller 14 is located at the rear right end of the second flat plate 17, and the bottom of the third roller 14 is connected to the second flat plate 17 through the third support shaft 20-3.

[0044] A first bearing 40 is provided between the motor shaft 21 and the first flat plate 16. A third bearing 25 is provided between the motor shaft 21 and the second flat plate 17. A fifth bearing 26 is provided between the motor shaft 21 and the base 1. The second driving mechanism 33 is located below the base 1, making reasonable use of the upper and lower spaces of the base 1 and reducing the occupied area of the base 1.

[0045] On the right side of the first flat plate 16, there is a first long waist-shaped hole 16-1. Inside the first long waist-shaped hole 16-1, there is a first adjusting shaft 23 for adjusting the tension of the first chain 30-1. The first adjusting shaft 23 can move within the first long waist-shaped hole 16-1 to change its longitudinal position (taking the left-right direction of the first flat plate 16 as the transverse direction and the front-back direction of the first flat plate 16 as the longitudinal direction). The first adjusting shaft 23 abuts against the first chain 30-1. As the longitudinal position of the first adjusting shaft 23 changes, the relative position between the first adjusting shaft 23 and the first chain 30-1 also changes. The first adjusting shaft 23 longitudinally stretches the first chain 30-1 to achieve the purpose of adjusting the tension of the first chain 30-1, so that the first chain 30-1 always maintains a good working state. On the left side of the second flat plate 17, there is a second long waist-shaped hole 17-2. Inside the second long waist-shaped hole 17-2, there is a second adjusting shaft 24 for adjusting the tension of the second chain 30-2. The second adjusting shaft 24 can move within the second long waist-shaped hole 17-2 to change its longitudinal position (taking the left-right direction of the second flat plate 17 as the transverse direction and the front-back direction of the second flat plate 17 as the longitudinal direction). The second adjusting shaft 24 abuts against the second chain 30-2. As the longitudinal position of the second adjusting shaft 24 changes, the relative position between the second adjusting shaft 24 and the second chain 30-2 also changes. The second adjusting shaft 24 longitudinally stretches the second chain 30-2 to achieve the purpose of adjusting the tension of the second chain 30-2, so that the second chain 30-2 always maintains a good working state.

[0046] The second driving mechanism 33 is connected to the fifth connecting plate 32. The fifth connecting plate 32 is connected to the base 1 through the third connecting shaft 31. The second driving mechanism 33 includes a motor of model RNYM02-1220 of the hyponic brand. The motor of the second driving mechanism 33 rotates. To prevent the motor from shifting or vibrating due to rotation, the direction of the second driving mechanism 33 is fixed through the fifth connecting plate 32, and the fifth connecting plate 32 is connected to the base 1 through the third connecting shaft 31 to achieve the fixing effect of the second driving mechanism 33.

[0047] The first driving mechanism 2 includes a square cylinder and a fixed seat 42. The fixed seat 42 is U-shaped. The rear end of the square cylinder is fixed on the fixed seat 42 through the sixth connecting plate. On the fixed seat 42 on the left and right sides of the square cylinder, there is a first limit screw 3 each. The first limit screws 3 in the left and right directions clamp the square cylinder after being tightened to fix the position of the square cylinder in the left-right direction. On the base 1 directly below the square cylinder, there is a second limit screw 4. The second limit screw 4 vertically abuts against the square cylinder from bottom to top to ensure that the height of the square cylinder remains unchanged and ensure that the moving end of the square cylinder moves within the horizontal plane.

[0048] At the top of the first roller 11, the top of the second roller 12, the top of the third roller 14, and the top of the fourth roller 15, there are cover plates 18 for blocking the corresponding drums, and the cover plates 18 are used to fix the drums of the corresponding rollers.

[0049] The first flat plate 16 and the second flat plate 17 have the same length, and the distance from the axis of the first hinge pin 9 to the axis of the motor shaft 21 is equal to the distance from the axis of the second hinge pin 36 to the axis of the motor shaft 21. This can ensure that the first roller 11 and the second roller 12 are aligned, and the third roller 14 and the fourth roller 15 are aligned, achieving a better centering effect on the steel pipe.

[0050] The usage method of a centering device for transporting steel pipes in Embodiment 1 is as follows: First, the movable rod of the first driving mechanism 2 retracts, and the double-joint 5 pulls the two connecting plates backward, and the two connecting plates simultaneously pull the first flat plate 16 and the second flat plate 17 apart (i.e., move in an "X" shape). At this time, the first roller 11 and the second roller 12 are separated, and the third roller 14 and the fourth roller 15 are separated. Secondly, place the steel pipe between the first roller 11 and the second roller 12, and between the third roller 14 and the fourth roller 15. Then, the movable rod of the first driving mechanism 2 extends forward, and the double-joint 5 pushes and pulls the two connecting plates, and the two connecting plates simultaneously close the first flat plate 16 and the second flat plate 17. At this time, the first roller 11 and the second roller 12 clamp the steel pipe, and the third roller 14 and the fourth roller 15 clamp the steel pipe, realizing automatic centering of the steel pipe. Thirdly, the second driving mechanism 33 drives the motor shaft 21 to rotate. The third gear 27 of the motor shaft 21 drives the first gear 29 and the second gear 28 to rotate synchronously and in the same direction through two chains. The fourth roller 15 and the second roller 12 rotate synchronously and in the same direction, and the first roller 11 and the third roller 14 rotate passively, realizing the movement of the steel pipe to the left or right in the centered state, and the steel pipe remains centered during the movement.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0052] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0053] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be similarly included within the patent protection scope of the present utility model.

Claims

1. A centering device for conveying steel pipes, characterized in that: The centering device for the conveying steel pipe includes a base (1). A first driving mechanism (2) is provided on the base (1). The movable end of the first driving mechanism (2) is connected to a double-joint (5). The double-joint (5) is respectively connected to one side of two groups of connecting plates through a third hinge pin (6). The other ends of the two groups of connecting plates are respectively connected to a first flat plate (16) and a second flat plate (17). The first flat plate (16) and the second flat plate (17) are distributed up and down, and a motor shaft (21) is connected to the middle position of both of them. Above the two ends of the first flat plate (16), a first roller (11) and a fourth roller (15) are respectively provided. Above the two ends of the second flat plate (17), a second roller (12) and a third roller (14) are respectively provided. The first roller (11) corresponds to the second roller (12), and the third roller (14) corresponds to the fourth roller (15). The second roller (12) is connected to a second gear (28) through a second transmission shaft (19). The fourth roller (15) is connected to a first gear (29) through a fourth transmission shaft (43). The motor shaft (21) is connected to the movable end of a second driving mechanism (33). A third gear (27) is further provided on the motor shaft (21). The third gear (27) is connected to the second gear (28) through a second chain (30-2). The third gear (27) is connected to the first gear (29) through a first chain (30-1).

2. The centering device for transporting steel pipes according to claim 1, wherein: The two groups of connecting plates include a first group of connecting plates connected to the first flat plate (16) and a second group of connecting plates connected to the second flat plate (17). The first group of connecting plates includes a first connecting plate (7) and a second connecting plate (13). The rear ends of the first connecting plate (7) and the second connecting plate (13) are both connected to the third hinge pin (6). The front ends of the first connecting plate (7) and the second connecting plate (13) are both connected to the left side of the first flat plate (16) through a first hinge pin (9). The first connecting plate (7) and the second connecting plate (13) are connected through a first connecting block (10). The second group of connecting plates includes a third connecting plate (34) and a fourth connecting plate (35). The rear ends of the third connecting plate (34) and the fourth connecting plate (35) are both connected to the third hinge pin (6). The front ends of the third connecting plate (34) and the fourth connecting plate (35) are both connected to the right side of the second flat plate (17) through a second hinge pin (36). The third connecting plate (34) and the fourth connecting plate (35) are connected through a second connecting block (38). The first flat plate (16) and the second flat plate (17) are connected through the motor shaft (21) and are distributed in an X shape.

3. The centering device for a conveying steel pipe according to claim 2, wherein: The double-joint (5) is in a U shape. The bottom of the U-shaped double-joint (5) is connected to the movable end of the first driving mechanism (2). The two sides of the double-joint (5) are respectively an upper connecting part (5-1) and a lower connecting part (5-2). The first flat plate (16) is located between the front ends of the first connecting plate (7) and the second connecting plate (13). The upper connecting part (5-1) of the double-joint (5) is located between the rear ends of the first connecting plate (7) and the second connecting plate (13). The second flat plate (17) is located between the front ends of the third connecting plate (34) and the fourth connecting plate (35), and the lower connecting part (5-2) of the double-joint (5) is located between the rear ends of the third connecting plate (34) and the fourth connecting plate (35).

4. The centering device for transporting steel pipes according to claim 3, wherein: The upper end of the first hinge pin (9) is provided with a first groove (9-1), the first groove (9-1) is higher than the top surface of the first connecting plate (7), a first baffle (8) is provided on the top surface of the first connecting plate (7), and the first baffle (8) is embedded in the first groove (9-1); The upper end of the second hinge pin (36) is provided with a second groove (36-1), the second groove (36-1) is higher than the top surface of the third connecting plate (34), a second baffle (37) is provided on the top surface of the third connecting plate (34), and the second baffle (37) is embedded in the second groove (36-1); The upper end of the third hinge pin (6) is provided with a third groove (6-1), the third groove (6-1) is higher than the top surface of the first connecting plate (7), a third baffle (39) is provided on the top surface of the first connecting plate (7), and the third baffle (39) is embedded in the third groove (6-1).

5. The centering device for transporting steel pipes according to claim 4, wherein: The fourth roller (15) is located at the right end of the first flat plate (16) near the front, the bottom of the fourth roller (15) is connected to the fourth transmission shaft (43), a fourth bearing (22) is provided between the fourth transmission shaft (43) and the first flat plate (16), the first roller (11) is located at the left end of the first flat plate (16) near the rear, and the bottom of the first roller (11) is connected to the first flat plate (16) through a first support shaft (20-1); The second roller (12) is located at the left end of the second flat plate (17) near the front, the bottom of the second roller (12) is connected to the second transmission shaft (19), a second bearing (41) is provided between the second transmission shaft (19) and the second flat plate (17), the third roller (14) is located at the right end of the second flat plate (17) near the rear, and the bottom of the third roller (14) is connected to the second flat plate (17) through a third support shaft (20-3); A first bearing (40) is provided between the motor shaft (21) and the first flat plate (16), a third bearing (25) is provided between the motor shaft (21) and the second flat plate (17), a fifth bearing (26) is provided between the motor shaft (21) and the base (1), and the second driving mechanism (33) is located below the base (1).

6. The centering device for transporting steel pipes according to claim 5, wherein: A first long oval hole (16-1) is provided on the right side of the first flat plate (16), and a first adjusting shaft (23) for adjusting the tension of the first chain (30-1) is provided in the first long oval hole (16-1); A second long oval hole (17-2) is provided on the left side of the second flat plate (17), and a second adjusting shaft (24) for adjusting the tension of the second chain ( 7. The centering device for transporting steel pipes according to claim 6, wherein: ​ 8. The centering device for conveying steel pipes according to claim 7, wherein: The first driving mechanism (2) includes a square cylinder and a fixing seat (42). The fixing seat (42) is U-shaped. The rear end of the square cylinder is fixed to the fixing seat (42) through a sixth connecting plate. A first limit screw (3) is provided on each of the fixing seats (42) on the left and right sides of the square cylinder, and a second limit screw (4) is provided on the base (1) directly below the square cylinder.

9. The centering device for conveying steel pipes according to claim 8, wherein: Covers (18) for sealing the corresponding rollers are provided on the tops of the first roller (11), the second roller (12), the third roller (14), and the fourth roller (15).

10. The centering device for conveying steel pipes according to claim 9, wherein: The first flat plate (16) and the second flat plate (17) have the same length, and the distance from the axis of the first hinge pin (9) to the axis of the motor shaft (21) is equal to the distance from the axis of the second hinge pin (36) to the axis of the motor shaft (21).

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