Rotating device for washing large-diameter steel pipe

Abstract

The utility model relates to the technical field of steel pipe washing equipment, in particular to a rotating device for washing a large-diameter steel pipe, which comprises a roller supporting plate, a rotating mechanism, a driving mechanism, a position adjusting mechanism and a supporting seat, the rotating mechanism is arranged above the roller supporting plate, the driving mechanism is arranged on one side of the roller supporting plate, and the position adjusting mechanism is arranged on the supporting seat. The driving mechanism is connected with the rotating mechanism; the position adjusting mechanism is arranged below the roller supporting plate and adjusts position lifting of the rotating device and the large-diameter steel pipe. And the supporting seat is connected with the position adjusting mechanism below the roller supporting plate to support the whole rotating device. According to the utility model, a plurality of supporting rollers are arranged to ensure the stability of the steel pipe in the rotating process, and the rotary washing of large-diameter steel pipes with different specifications before a hydrostatic test is realized by changing the specification of the roller and changing the mounting distance between the key slot, the motor cover supporting seat and the speed reducing motor supporting seat; the design of the oil cylinder supporting base, the double guide columns and the double cushion blocks of a box-type structure ensures that the equipment is high in bearing capacity and stable and reliable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe flushing equipment, and particularly relates to a rotating device for flushing large-diameter steel pipes. Background Art

[0002] Large-diameter steel pipes refer to spiral welded pipes with a diameter of 610 - 2020 mm. During the production, transportation, and use of large-diameter steel pipes, impurities such as dirt and rust are likely to adhere to the inner wall of the steel pipes. Before conducting a hydrostatic test on large-diameter steel pipes, it is usually necessary to clean the scale residues on the inner wall of the steel pipes. Due to the large diameter and diverse sizes of the steel pipes, when flushing, the weight of the clear water plus the self-weight of the steel pipes can reach dozens or hundreds of tons. Traditional steel pipe flushing methods often have problems such as uneven flushing, low efficiency, difficulty in controlling the quality after cleaning, unsatisfactory flushing effect, etc., and there are certain safety hazards.

[0003] Therefore, there is an urgent need for a rotating device with strong load-bearing capacity and capable of meeting the specification changes of different pipe diameters. To ensure the stable and reliable operation of the equipment, a reasonable disassembly and assembly method for the power source also needs to be considered. Summary of the Utility Model

[0004] In order to solve the problems of uneven flushing, low efficiency, difficulty in controlling the quality after cleaning, unsatisfactory flushing effect, etc. during the rotating flushing of large-diameter steel pipes with multiple specifications, and there are certain safety hazards, the utility model provides a rotating device for flushing large-diameter steel pipes.

[0005] The technical solution of the utility model is as follows:

[0006] A rotating device for flushing large-diameter steel pipes includes a roller support plate, a rotating mechanism, a driving mechanism, a position adjusting mechanism, and a support base. The rotating mechanism is arranged above the roller support plate, and the driving mechanism is arranged on one side of the roller support plate. The driving mechanism is connected to the rotating mechanism and is used to drive the rotating mechanism to rotate. The position adjusting mechanism is arranged below the roller support plate and is used to adjust the position lifting of the rotating device and the large-diameter steel pipe. The support base is connected to the position adjusting mechanism below the roller support plate to support the entire rotating device.

[0007] The roller support plate is a welded part. At the four corners of the upper end face of the roller support plate, a group of bearing seat keyways are evenly distributed. Each group of bearing seat keyways consists of two keyways. On both sides of each group of bearing seat keyways, first mounting holes are opened. The bearing seat keyways and the first mounting holes are both connected to the rotating mechanism. On the side of the roller support plate where the driving mechanism is installed, a first load-bearing bar and a second load-bearing bar are respectively arranged. A second mounting hole is opened on the first load-bearing bar, and a third mounting hole is opened on the second load-bearing bar. The second mounting hole and the third mounting hole are both connected to the driving mechanism. At the center position of the roller support plate, fourth mounting holes are arranged in a circular matrix for connecting with the position adjusting mechanism. On the lower end face of the roller support plate, two flanges for assembling the position adjusting mechanism are evenly distributed along one diagonal, and two hollow cylindrical steels are welded on the other diagonal for mating connection with the position adjusting mechanism.

[0008] The rotating mechanism includes rollers, bearings, bearing seats, bearing seat positioning keys, and transmission shafts. There are two groups of rollers. One group is the driving rollers driven by the driving mechanism, and the other group is the driven rollers. The bearings are installed on the bearing seats, and both ends of the transmission shafts are installed on the bearings. The rollers are connected to the transmission shafts. The bearing seats are connected to the roller support plate through the bearing seat positioning keys. The bearing seat positioning keys are installed between the upper end face of the roller support plate and the lower end face of the bearing seats to bear the shear force brought by the rotation of the steel pipe and the rollers.

[0009] Each group of the rollers is composed of 3 rollers combined. The rollers are steel rollers, and a circle of polyurethane rubber wheels is attached to the outside. Annular grooves are opened on both end faces of the rollers, and 6 through holes are evenly distributed in the annular grooves.

[0010] The position adjusting mechanism includes guide rods, oil cylinder support seats, hydraulic oil cylinders, connection blocks, connection block pressing plates, and top blocks.

[0011] The guide rods are welded parts. The upper parts are vertically connected to the lower end face of the roller support plate through bolts. The lower parts are hollow steel pipes, which are installed in the oil cylinder support seats in a vertically movable manner. A guide sleeve and a gland are assembled between the hollow steel pipes and the oil cylinder support seats. The guide sleeve fixes the hollow steel pipes on the oil cylinder support seats through the gland.

[0012] The oil cylinder support seat is a welded box structure. On the upper surface of the oil cylinder support seat box, two cylinder barrels for assembling the guide rods are evenly distributed along the diagonal. Two cylindrical steels are welded on the other diagonal. Circular grooves are opened inside the two cylindrical steels, and there are threaded holes in the center. A circular counterbore is opened in the middle of the upper end face of the oil cylinder support seat box for bolt connection with the hydraulic oil cylinder. Rectangular holes are opened on both sides and the bottom end face of the oil cylinder support seat box.

[0013] The inside of the connecting block has a threaded hole for connecting with the piston rod of the hydraulic cylinder. The upper part of the connecting block is a circular arc surface for cooperating with the top block. The connecting block pressing plate is a pair of split flange plates for fixing the connecting block. The top block is connected to the middle position of the lower end surface of the roller support plate. An arc surface that can cooperate with the connecting block is opened inside the top block. The top block assembles the connecting block and the connecting block pressing plate together through screw connection.

[0014] A pilot-operated check valve is arranged on the side of the oil cylinder support seat. The oil cylinder support seat is connected to the pilot-operated check valve by screws. A hard pipe is used to connect between the pilot-operated check valve and the oil inlet and outlet of the hydraulic cylinder.

[0015] The driving mechanism includes a reduction motor, a motor positioning key, and a motor support seat. The reduction motor is fixed on the rotating mechanism through the motor positioning key. The motor support is connected to the end surface of the roller support plate.

[0016] The reduction motor includes a motor positioning key and a transmission shaft. The reduction motor is fixed on the transmission shaft through the motor positioning key. The transmission shaft is installed on the motor support seat. One end of the transmission shaft connected to the reduction motor is connected to the driving roller, and the other end is connected to the driven roller.

[0017] The support seat is a welded part of two pieces, adopting the web of an eccentric I-beam structure, and is connected to the position adjustment mechanism by bolts.

[0018] The utility model has the following beneficial effects:

[0019] (1) The utility model drives the steel pipe to rotate through the rotating driving mechanism, realizing uniform and efficient flushing of the inner wall of the steel pipe, and greatly improving the flushing effect and efficiency.

[0020] (2) Multiple support rollers are arranged in the rotating mechanism of the utility model. The design of the double guide columns arranged diagonally in the position adjustment mechanism ensures the stability of the steel pipe during the lifting process.

[0021] (3) The utility model can meet the rotating flushing of large-diameter steel pipes of different lengths. Different numbers of rotating devices can be arranged corresponding to different steel pipe lengths, expanding its scope of use.

[0022] The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiment of the utility model and combines with the attached drawings to describe in detail as follows. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is the front view of the overall structure of the present invention;

[0025] Figure 2 is the left view of the overall structure of the present invention;

[0026] Figure 3 is the top view of the overall structure of the present invention;

[0027] Figure 4 is the top view of the roller support plate of the present invention;

[0028] Figure 5 is the top view of the oil cylinder support seat of the present invention;

[0029] Figure 6 is the placement state diagram of the small-diameter steel pipe of the present invention;

[0030] In the figure: 1, roller; 101, rubber wheel; 102, roller; 2, bearing seat; 3, motor cover support seat; 4, motor support seat; 5, guide rod; 6, oil cylinder support seat; 7, guide sleeve; 8, gland; 9, support seat; 10, hydraulic oil cylinder; 11, connecting block; 12, spacer block; 13, connecting block pressing plate; 14, bearing seat positioning key; 15, top block; 16, position switch; 17, switch bracket; 18, bearing end cover; 19, bearing; 20, transmission shaft; 21, roller positioning key; 22, roller support plate; 23, pilot-operated check valve; 24, reduction motor; 25, motor waterproof cover; 26, motor positioning key; 27, bushing; 28, bearing through cover. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] Such as Figures 1-6A rotary device for flushing large-diameter steel pipes as shown, comprising a roller support plate 22, a rotary mechanism, a driving mechanism, a position adjustment mechanism, and a support base 9. The rotary mechanism is arranged above the roller support plate 22, and the driving mechanism is arranged on one side of the roller support plate 22. The driving mechanism is connected to the rotary mechanism to drive the rotary mechanism to rotate. The position adjustment mechanism is arranged below the roller support plate 22 to adjust the position lift of the rotary device and the large-diameter steel pipe. The support base 9 is connected to the position adjustment mechanism below the roller support plate 22 to support the entire rotary device.

[0033] As Figure 4 shown, the roller support plate 22 is a rectangular welded part. Four corners of the upper end face of the roller support plate 22 are evenly distributed with a set of bearing seat key grooves. Each set of bearing seat key grooves has two, which are arranged at a certain interval. The interval is preferably 60-90 mm. There is a round groove inside the bearing seat 2 for assembling the bearing end cover 18, the bearing 19, the transmission shaft 20, etc. A key groove is opened at the bottom of the bearing seat 2. The bearing seat positioning key 14 is assembled up and down in the key grooves of the roller support plate 22 and the bearing seat 2. On both sides of the key grooves opened on each set of roller support plates 22, first mounting holes are respectively opened. The first mounting holes are bearing seat mounting holes. The bearing seat 2 of the rotary mechanism is threadedly connected to the roller support plate 22 through the first mounting holes.

[0034] Further, on one side of the roller support plate 22 where the driving mechanism is installed, a first load-bearing rectangular bar and a second load-bearing rectangular bar are respectively arranged at a certain interval. A second mounting hole, that is, a motor cover support seat 3 mounting hole, is opened on the first load-bearing rectangular bar. A third mounting hole, that is, a motor support seat 4 mounting hole, is opened on the second load-bearing rectangular bar. The second mounting hole and the third mounting hole are both connected to the driving mechanism. The roller support plate 22 is provided with fourth mounting holes in a circular matrix at the central position. The top block 15 is connected in the fourth mounting holes for connecting with the position adjustment mechanism. On the lower end face of the roller support plate 22, two flange plates for assembling the position adjustment mechanism are evenly distributed along one diagonal, and two hollow cylindrical steels are welded on the other diagonal for cooperating with the polyurethane pads 12 of the position adjustment mechanism. When the hydraulic cylinder 10 is at the lower limit, the fittings above the roller support plate 22 are supported by two pads on the oil cylinder support seat 6.

[0035] The motor cover support seat 3 is a welded part, with a total of two pieces, which are connected to the end face of the roller support plate 22 through the second mounting holes. Three threaded holes are evenly distributed at the position where the motor cover support seat 3 is flush with the upper end face of the roller support plate 22 for assembling the motor waterproof cover 25.

[0036] The motor support seat 4 is a welded part, which is connected to the end face of the roller support plate 22 through the third mounting holes. The motor support seat 4 is connected to the reduction motor 24 through a through hole, a pin shaft, and a rubber pad to play a role in supporting the motor.

[0037] The rotating mechanism includes rollers 1, bearings 19, bearing seats 2, bearing seat positioning keys 14, and a transmission shaft 20; there are two groups of rollers 1, one group is the driving rollers driven by a driving mechanism, and the other group is the driven rollers; the bearings 19 are installed on the bearing seats 2, both ends of the transmission shaft 20 are installed on the bearings 19, and the rollers 1 are connected to the transmission shaft 20; the bearing seats 2 are connected to the roller support plate 22 through the bearing seat positioning keys 14, and the bearing seat positioning keys 14 are installed between the upper end face of the roller support plate 22 and the lower end face of the bearing seat 2 to bear the shear force brought by the rotation of the steel pipe and the rollers 1.

[0038] Each group of the rollers 1 is composed of 3 rollers 102, the rollers 102 are steel rollers, and a circle of polyurethane rubber wheels 101 is attached to the outside; annular grooves are opened on both end faces of the rollers 102, and 6 through holes are evenly distributed in the annular grooves. While ensuring the structural strength, the weight of the rollers is reduced. If it is necessary to match larger-sized steel pipes in the future, it can be achieved by increasing the number of rollers, increasing the diameter of the rollers, and increasing the number of positioning keys.

[0039] The driving mechanism includes a reduction motor 24, a motor positioning key 26, a transmission shaft 20, and a motor support seat 4. The reduction motor 24 is fixed on the transmission shaft 20 through the motor positioning key 26, the transmission shaft 20 is installed on the motor support seat 4, and the motor support seat 4 is connected to the end face of the roller support plate 22.

[0040] One end of the roller driven by the reduction motor 24 is the driving roller, and the other end is connected to the driven roller. On one side of the driving roller, a bearing end cover 18, a bearing 19, a transmission shaft 20, a roller 1, a roller positioning key 21, a bearing through cover 28, a motor positioning key 26, a bearing seat positioning key 14, a bushing 27, a reduction motor 24, a motor waterproof cover 25, a motor support seat 4, and a motor cover support seat 3 are sequentially assembled on the roller support plate 22; the roller positioning key 21 fixes the transmission shaft 20 and the rollers, and the bearing through cover 28 can enclose the bearing seat 2 assembled on the motor side; the reduction motor 24 on one side of the driving roller is fixed on the transmission shaft 20 through the motor positioning key 26 and is connected to the motor support seat 4;

[0041] The other end is the driven roller, and a bearing end cover 18, a bearing 19, a transmission shaft 20, a roller 1, a roller positioning key 21, and a bearing seat positioning key 14 are sequentially assembled on the roller support plate 22 for the driven roller.

[0042] Roller positioning key grooves are respectively provided on the transmission shaft 20 and the center hole of the steel wheel, and the roller positioning key 21 is clamped in the grooves to fix the shaft and the rollers, and is used to bear the shear force brought by the rotation of the steel pipe and the rollers.

[0043] The position adjustment mechanism includes a guide rod 5, an oil cylinder support seat 6, a hydraulic cylinder 10, a connecting block 11, a connecting block pressing plate 13, and a top block 15;

[0044] The guide rod 5 is a welded part, with a total of two pieces. The upper part is an end cover with a flange, and the upper part is vertically connected to the flange on the lower end face of the roller support plate 22 by bolts. The lower part is a hollow steel pipe, which is installed in the oil cylinder support seat 6. A guide sleeve 7 and a gland 8 are assembled between the hollow steel pipe and the oil cylinder support seat 6; the guide sleeve 7 fixes the hollow steel pipe on the oil cylinder support seat 6 through the gland 8; the double-guide rod design ensures that the hydraulic cylinder is evenly stressed and the lifting is stable and reliable.

[0045] The oil cylinder support seat 6 is a welded box structure. The upper surface of the box of the oil cylinder support seat 6 is as Figure 5 shown: There are two cylinder barrels for assembling the guide rod 5 evenly distributed along the diagonal on the upper surface of the box. Two cylindrical steels are welded on the other diagonal. Round grooves are opened inside the two cylindrical steels, and there are threaded holes in the center for assembling the polyurethane cushion block 12. A circular counterbore is opened in the middle of the upper end face of the box of the oil cylinder support seat 6 for the installation and positioning of the hydraulic cylinder 10. There are 8 through holes evenly distributed in the circular counterbore for bolt connection with the hydraulic cylinder 10.

[0046] Rectangular holes are opened on both sides and the bottom end face of the box of the oil cylinder support seat 6, which are observation holes for equipment disassembly and assembly, and are used for the hard pipe connection of the oil pipe of the oil cylinder oil port and the disassembly and assembly of the flange of the hydraulic cylinder.

[0047] The hydraulic cylinder 10 is a heavy-duty front flange oil cylinder. The lower end face of the flange is positioned by the circular groove on the upper end face of the oil cylinder support seat 6 and is connected by bolts.

[0048] The cushion block 12 is a cylinder made of polyurethane, with a counterbore for assembling screws in the middle. The outer diameter of the cylinder is slightly smaller than the round groove of the cylindrical steel, and the cushion block is connected to the cylindrical steel by screws.

[0049] There is a threaded hole inside the connecting block 11 to connect with the piston rod of the hydraulic cylinder 10. The upper part of the connecting block 11 is a circular arc surface for cooperating with the top block 15; the connecting block pressing plate 13 is a pair of half-sectioned flange plates for fixing the connecting block 11; the top block 15 is connected to the middle position of the lower end face of the roller support plate 22, and an arc surface that can cooperate with the connecting block 11 is opened inside the top block 15. The top block 15 assembles the connecting block 11 and the connecting block pressing plate 13 together by screw connection.

[0050] The switch bracket 17 in this embodiment is an L-shaped steel, with a round groove opened on one side for assembling the position switch 16.

[0051] A pilot-operated check valve 23 is arranged on the side of the oil cylinder support seat 6. The oil cylinder support seat 6 is connected to the pilot-operated check valve 23 by screws, and the pilot-operated check valve 23 is connected to the oil inlet and outlet of the hydraulic cylinder 10 by hard pipes.

[0052] The support base 9 is composed of two welded parts, with the web of an eccentric I-beam structure, and is connected to the oil cylinder support base 6 of the position adjustment mechanism by bolts.

[0053] Furthermore, the motor waterproof cover is a thin-walled welded part, which can extend the working life of the rotating device during the flushing operation.

[0054] Furthermore, the reducer motor is a brake-equipped variable-frequency motor, which can adjust different rotational speeds according to steel pipes of different diameter specifications, improving the cleaning ability of the inner diameter of the steel pipes.

[0055] Furthermore, as Figure 6 shown, since the outer diameter specification of the steel pipe becomes smaller, the distance between the center of the steel pipe and the axis of the roller becomes shorter, making it easy for the steel pipe to slip and unable to rotate normally. At this time, after successively removing the bearing seat, bearing seat positioning key, motor cover support seat, and motor support seat, move inward by one keyway position on the end face of the roller support plate to shorten the distance between the driving roller and the driven roller, enabling the steel pipe with a smaller diameter to rotate normally. Similarly, if there are still steel pipes with a large specification span, multiple keyways with a certain spacing and installation hole positions for the motor cover support seat and motor support seat can also be provided on the end face of the roller support plate.

[0056] This device can meet the rotation flushing of large-diameter steel pipes of different lengths, and different numbers of rotating devices can be arranged corresponding to different steel pipe lengths.

[0057] The specific technological process of the rotating device for flushing large-diameter steel pipes is as follows:

[0058] (1) The hydraulic cylinder is at the lower limit waiting for materials, and at this time, the lower position switch signal on the switch bracket is powered on;

[0059] (2) After the rotating device receives the materials, the hydraulic cylinder lifts the roller support plate to the upper limit position, and at this time, the upper position switch signal on the switch bracket is powered on;

[0060] (3) The reduction motor drives the driving roller and the steel pipe to rotate;

[0061] (4) The flushing device starts to flush, cleaning the scale inside the steel pipe;

[0062] (5) After the flushing is completed, the reduction motor brakes, the hydraulic cylinder returns to the lower limit position, and the stepping device takes the materials to the pressure test station.

[0063] The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design identical or similar to the present invention falls within the protection scope of the present invention.

Claims

1. A rotary device for flushing large-diameter steel pipes, comprising a roller support plate (22), a rotary mechanism, a driving mechanism, a position adjusting mechanism and a support seat (9), characterized in that: The rotation mechanism is arranged above the roller support plate (22), and the driving mechanism is arranged on one side of the roller support plate (22). The driving mechanism is connected to the rotation mechanism and is used to drive the rotation mechanism to rotate; the position adjustment mechanism is arranged below the roller support plate (22) and is used to adjust the position lifting of the rotation device and the large-diameter steel pipe; the support seat (9) is connected to the position adjustment mechanism below the roller support plate (22) to support the entire rotation device.

2. The rotating device for flushing large-diameter steel pipes according to claim 1, wherein: The roller support plate (22) is a welded part. A set of bearing seat key grooves are evenly distributed at the four corners of the upper end surface of the roller support plate (22). There are two bearing seat key grooves in each group. First mounting holes are respectively opened on both sides of each group of bearing seat key grooves. Both the bearing seat key grooves and the first mounting holes are connected to the rotation mechanism; on the side of the roller support plate (22) where the driving mechanism is installed, a first load-bearing bar and a second load-bearing bar are respectively arranged. A second mounting hole is opened on the first load-bearing bar, and a third mounting hole is opened on the second load-bearing bar. Both the second mounting hole and the third mounting hole are connected to the driving mechanism; the roller support plate (22) is provided with fourth mounting holes in a circular matrix at the central position for connecting to the position adjustment mechanism; on the lower end surface of the roller support plate (22), two flange plates for assembling the position adjustment mechanism are evenly distributed along one diagonal, and two hollow cylindrical steels are welded on the other diagonal for mating connection with the position adjustment mechanism.

3. The rotating device for flushing large-diameter steel pipes according to claim 1, characterized in that: The rotation mechanism includes rollers (1), bearings (19), bearing seats (2), bearing seat positioning keys (14) and transmission shafts (20); there are two groups of the rollers (1), one group is the driving rollers driven by the driving mechanism, and the other group is the driven rollers; the bearings (19) are installed on the bearing seats (2), and both ends of the transmission shafts (20) are installed on the bearings (19), and the rollers (1) are connected to the transmission shafts (20); the bearing seats (2) are connected to the roller support plate (22) through the bearing seat positioning keys (14). The bearing seat positioning keys (14) are installed between the upper end surface of the roller support plate (22) and the lower end surface of the bearing seat and are used to bear the shear force brought by the rotation of the steel pipe and the rollers.

4. A rotary device for flushing large-diameter steel pipes according to claim 3, characterized in that: Each group of the rollers (1) is composed of 3 rollers (102). The rollers (102) are steel rollers, and a circle of polyurethane rubber wheels (101) is attached to the outside; annular grooves are opened on both end faces of the rollers (102), and 6 through holes are evenly distributed in the annular grooves.

5. The rotary device for flushing large-diameter steel pipes according to claim 1, wherein: The position adjustment mechanism includes a guide rod (5), an oil cylinder support seat (6), a hydraulic oil cylinder (10), a connection block (11), a connection block pressing plate (13) and a top block (15); The guide rod (5) is a welded part. The upper part is vertically connected to the lower end surface of the roller support plate (22) through bolts. The lower part is a hollow steel pipe that can be installed in the oil cylinder support seat (6) to move up and down. A guide sleeve (7) and a gland (8) are assembled between the hollow steel pipe and the oil cylinder support seat (6); the guide sleeve (7) fixes the hollow steel pipe on the oil cylinder support seat (6) through the gland (8); The oil cylinder support seat (6) is a welded box structure. On the upper surface of the box of the oil cylinder support seat (6), two cylinder barrels for assembling the guide rods (5) are evenly distributed along the diagonal. On the other diagonal, two cylindrical steels are welded. Circular grooves are formed inside the two cylindrical steels, and there are threaded holes in the center. A circular counterbore is formed in the middle of the upper end face of the box of the oil cylinder support seat (6) for bolt connection with the hydraulic cylinder (10); rectangular holes are formed on both sides and the bottom end face of the box of the oil cylinder support seat (6). There is a threaded hole inside the connecting block (11) for connection with the piston rod of the hydraulic cylinder (10). The upper part of the connecting block (11) is a circular arc surface for cooperation with the top block (15); the connecting block pressing plate (13) is a pair of half-section flange plates for fixing the connecting block (11); the top block (15) is connected to the middle position of the lower end face of the roller support plate (22). An arc surface that can cooperate with the connecting block (11) is formed inside the top block (15). The top block (15) assembles the connecting block (11) and the connecting block pressing plate (13) together by screw connection.

6. The rotary device for flushing large-diameter steel pipes according to claim 5, wherein: A pilot-operated check valve (23) is arranged on the side of the oil cylinder support seat (6). The oil cylinder support seat (6) is connected to the pilot-operated check valve (23) by screws. A hard pipe is used to connect between the pilot-operated check valve (23) and the oil inlet and outlet of the hydraulic cylinder (10).

7. A rotary device for flushing large-diameter steel pipes according to claim 1, characterized in that: The driving mechanism includes a reduction motor (24), a motor positioning key (26) and a motor support seat (4). The reduction motor (24) is fixed on the rotating mechanism through the motor positioning key (26), and the motor support seat (4) is connected to the end face of the roller support plate (22).

8. A rotary device for flushing large-diameter steel pipes according to claim 1, characterized in that: The support seat (9) is composed of two welded parts, adopting the web of an eccentric I-beam structure, and is connected to the position adjusting mechanism by bolts.

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