A kind of corrosion oil pipe hot rolling reconditioning multi-roller radial adjustment rolling tool device
By setting up a pre-rolling device in the hot rolling equipment for tubing to provide centering support and pre-forming of protrusions, the problem of insufficient rigidity after hot rolling of tubing was solved, multi-roll radial adjustment rolling was realized, and the quality and precision of refining were improved.
Patent Information
- Application Number
- CN202611532832.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-30
- Publication Date
- 2026-11-03
AI Technical Summary
The existing rolling equipment has insufficient rigidity after the oil pipe is softened by hot rolling. The lack of support at the feed end makes it prone to eccentricity, which causes radial swaying and local bulges in the oil pipe, leading to stress concentration and a decline in the quality of the refinished product.
A pre-rolling unit with an elastic pre-compression structure is set up on the feed side of the main rolling unit to form a series of rolling stations. The pre-rolling unit is used to center and support the oil pipe and pre-shape the protrusion. Combined with multi-roll radial adjustment rolling, the rolling stress concentration is eliminated.
It improved the quality of tubing remolding, reduced tubing misalignment and local defects, and enhanced rolling precision and forming effect.
Smart Images
Figure CN123024784A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal pipe rolling technology, and more specifically, to a multi-roll radial adjustment rolling fixture for hot rolling and renewing corroded oil pipes. Background Technology
[0002] During oilfield extraction operations, oil pipes are in constant contact with formation water and corrosive media, making them highly susceptible to external wall corrosion, minor deformation, and localized bulge defects. Directly scrapping a large number of corroded and failed oil pipes would result in significant resource waste and extraction cost losses. Therefore, oil pipe refurbishment and reuse has become a core technology for the recycling of oilfield pipe materials. In conventional corrosion oil pipe refurbishment systems, to ensure the quality of subsequent rolling refurbishment, the industry generally adopts a pre-screening process to pre-treat the oil pipes to be processed. Through manual inspection and shape inspection equipment, deteriorated oil pipes with severe bending, large-area bulges, and structural damage are removed in advance, providing a qualified billet base for subsequent precise rolling refurbishment.
[0003] Currently, for mildly deformed and corroded oil pipes after screening, the mainstream refurbishment process adopts an integrated processing method of hot rolling softening combined with skew rolling shaping. Its conventional working principle is as follows: First, the screened and qualified corroded oil pipes are subjected to overall hot rolling softening treatment. The hardness and rigidity of the oil pipe are reduced by high temperature heating. After softening, the oil pipe is directly fed into the multi-roll skew rolling machine (three-roll skew rolling machine) along the axial direction. The skew rolling rolls, which are evenly arranged around the circumference of the machine, surround the outer wall of the oil pipe. The oil pipe is spirally fed by the rotation of the rolls. At the same time, the corrosion and deformation defects of the oil pipe are repaired by the radial pressing action of the rolls.
[0004] However, the overall rigidity of the tubing decreases significantly after hot rolling softening treatment, and the tubing's resistance to bending and offset weakens drastically. Existing rolling equipment only has a single main rolling station, and the feed end of the softened tubing is suspended and unsupported. During the feeding process, radial sway and center offset are prone to occur, causing the tubing and rolling fixture to be unable to be precisely coaxially aligned. At the same time, the small local protrusions remaining on the outer wall of the tubing directly enter the rolling deformation zone, causing local rolling stress concentration. This not only exacerbates the problems of tubing deviation and alignment failure, but also easily leads to secondary defects such as local over-rolling and outer wall indentation. In view of this, there is an urgent need for a multi-roll radial adjustment rolling fixture device for hot rolling and renewing corroded tubing to solve the above problems. Summary of the Invention
[0005] This invention provides a multi-roll radial adjustment rolling fixture for hot rolling and refining corroded oil tubing. It forms a series of rolling stations by coaxially installing a pre-rolling device with an elastic pre-compression structure on the feed side of the main rolling mill. This allows the softened oil tubing to first undergo centering support and pre-shaping of the protrusions, followed by independent multi-roll radial rolling. This avoids the problem of eccentric oscillation during tubing feed while eliminating rolling stress concentration, thereby solving the problems mentioned in the background art.
[0006] After hot rolling and softening, the rigidity of the tubing is insufficient. The lack of support at the feed end of the existing equipment makes it prone to eccentricity. Tube wall protrusion will cause stress concentration, resulting in defects such as indentations and reducing the quality of refurbishment.
[0007] To achieve the above objectives, the hot rolling regeneration multi-roll radial adjustment rolling fixture for corroded oil pipes includes a rolling fixture body, which includes a main rolling device and a pre-rolling device. The bottoms of the pre-rolling device and the main rolling device are both located on a base. The pre-rolling device is located on the feed side of the main rolling device. A sliding assembly is connected to the bottom of the pre-rolling device, and the sliding assembly is mounted on the base. The sliding assembly can drive the pre-rolling device to move along the feed direction of the oil pipe body to adjust the axial distance between the pre-rolling device and the main rolling device.
[0008] The main rolling unit is equipped with a main rolling roll group, which is used to perform multi-roll radial adjustment rolling on the tubing body. The pre-rolling unit is equipped with a pre-rolling roll group, which is used to center and provide auxiliary support for the tubing body before it enters the main rolling unit.
[0009] When the tubing body to be repaired passes through the pre-rolling device and the main rolling device in sequence, the pre-rolling roll group can first pre-roll the tubing body, and then the main rolling roll group performs multi-roll radial adjustment rolling on the pre-rolled tubing body.
[0010] In the above technical solution, by setting up a pre-rolling device with adjustable axial position on the feeding side of the main rolling unit, a series of pre-forming and main rolling stations are formed. Centering support and pre-rolling shaping can be completed before the oil pipe enters the main rolling area, which improves the feeding centering performance of hot-rolled softened oil pipe, reduces pipe offset and stress unevenness during the rolling process, and improves the quality of oil pipe re-forming.
[0011] Based on this, the main rolling device includes a main frame mounted on a base, the main frame having three first rolling chambers, and three main roll sets, which are respectively installed in the three first rolling chambers to perform multi-roll radial adjustment rolling on the oil pipe body.
[0012] In addition, the main roll assembly includes a main drive unit, which is fixedly mounted on the main frame. The movable end of the main drive unit is equipped with a slanted roll assembly, which is used to drive the slanted roll assembly to move radially along the oil pipe body.
[0013] Preferably, the skew roll group includes a main roll seat fixedly connected to the movable end of the main drive component. A first lateral mounting component is provided at the end of the main roll seat away from the main drive component. Skew roll components are assembled in the first lateral mounting component. The three skew roll components cooperate to form a die for skew rolling the oil pipe body.
[0014] Specifically, the pre-rolling device includes a pre-rolling stand, which is located on the feed side of the main stand. The pre-rolling stand has three second rolling chambers, and the pre-rolling roll set has three units, which are respectively installed in the three second rolling chambers.
[0015] Furthermore, the pre-rolling roll group includes an auxiliary drive component, which is fixedly installed on the pre-rolling mill stand, and the movable end of the auxiliary drive component is equipped with an auxiliary roll group.
[0016] As a further improvement to this technical solution, the auxiliary roller group includes a pre-rolling seat fixedly connected to the movable end of the auxiliary drive component. A second lateral mounting component is provided at the end of the pre-rolling seat away from the auxiliary drive component. An auxiliary roller body is assembled in the second lateral mounting component. The second lateral mounting component is an elastic structure that can provide elastic preload to the auxiliary roller body. The three auxiliary roller bodies cooperate to form a hole pattern for centering auxiliary support and preload shaping of the oil pipe body.
[0017] The auxiliary drive unit is synchronously controlled to synchronously adjust the radial position of the three auxiliary roll bodies; the main drive unit of the main roll group is individually controlled to independently adjust the radial position of the three skew rolls; a cooling layer is provided in the auxiliary roll body, and the cooling layer can be circulated with a cooling medium.
[0018] Among them, the synchronous adjustment of the pre-rolling side rolls, combined with the elastic lateral mounting parts, can adaptively support the oil pipe and complete the pre-forming. The independent radial adjustment of the main rolling side skew rolls can adapt to the differences in pipe wall thickness. The roll cooling structure reduces the wear of the rolls under high temperature conditions. Overall, the synergistic effect improves the centering accuracy of the oil pipe and the skew rolling forming effect.
[0019] In another technical solution, the sliding assembly includes a sliding connector mounted on the surface of the base. The sliding connector has a sliding cavity, and a lead screw is installed in the sliding cavity. One section of the lead screw is fixedly connected to a motor output shaft fixedly mounted at the end of the sliding connector. The bottom end of the pre-rolling stand is movably sleeved on the surface of the lead screw. When the motor drives the lead screw to rotate, it drives the pre-rolling stand to move along the sliding cavity, adjusting the axial distance between the pre-rolling device and the main rolling device.
[0020] This technical solution uses a motor-driven screw transmission structure to move the pre-rolling stand along the sliding cavity, thereby automatically adjusting the axial position of the pre-rolling device, flexibly changing the axial distance between the pre-rolling device and the main rolling device, adapting to different specifications of oil pipes and refurbishment conditions, and optimizing the coordination between oil pipe pre-support and rolling.
[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0022] 1. In the hot rolling regeneration multi-roll radial adjustment rolling fixture for corrosion-resistant oil pipe, a pre-rolling device is coaxially arranged on the feed side of the main rolling device. Three auxiliary roll bodies are evenly arranged circumferentially inside the pre-rolling stand. The second lateral mounting part is an elastic structure that can provide elastic pre-pressure for the auxiliary roll bodies, thereby achieving centering and auxiliary support for the hot-rolled softened oil pipe. At the same time, it completes the pre-pressure shaping of the local protrusions on the outer wall, reducing the possibility of radial sway during the feeding process of the softened oil pipe and reducing the problem of center offset.
[0023] 2. In the hot rolling and refining multi-roll radial adjustment rolling fixture for corroded oil pipes, a series-connected pre-rolling unit and main rolling unit are arranged sequentially. The pre-rolling roll group first performs centering guidance and local protrusion pre-rolling treatment on the oil pipe body to eliminate local high points on the outer wall of the oil pipe in advance. Each main drive component of the main rolling roll group adopts an individual control mode, which can independently adjust the radial position of each inclined roll to adapt to the wall thickness difference at different positions of the oil pipe. Multi-roll radial adjustment rolling is carried out on the oil pipe after pre-forming treatment to avoid local protrusions directly entering the rolling deformation zone and causing rolling stress concentration, thereby reducing the occurrence of secondary defects such as local over-rolling and outer wall indentation of the pipe. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0025] Figure 2 This is a schematic diagram of the main rolling mill in this invention;
[0026] Figure 3 This is a schematic diagram of the internal structure of the main rolling mill in this invention;
[0027] Figure 4 This is a schematic diagram of the main roll assembly in this invention;
[0028] Figure 5 This is a structural diagram of the main rolling unit rolling the tubing body in this invention;
[0029] Figure 6 This is a schematic diagram of the sliding component in this invention;
[0030] Figure 7 This is a schematic diagram of the pre-rolling device in this invention;
[0031] Figure 8 This is a front view of the pre-rolling device in this invention;
[0032] Figure 9 This is a schematic diagram of the pre-rolling roll group in this invention;
[0033] Figure 10 This is a schematic diagram of the auxiliary roller body in this invention.
[0034] The meanings of the labels in the diagram are as follows:
[0035] 10. Rolling fixture body; 11. Oil pipe body; 12. Main rolling unit; 13. Pre-rolling unit; 14. Base; 15. Sliding assembly;
[0036] 111. Main frame; 112. First rolling chamber; 113. Main roll assembly; 121. Pre-rolling stand; 122. Second rolling chamber; 123. Pre-rolling roll assembly; 141. Sliding connector; 142. Sliding cavity; 143. Lead screw;
[0037] 21. Main drive component; 22. Inclined roller assembly; 221. Main roller seat; 222. Inclined roller assembly; 223. First lateral mounting component;
[0038] 31. Auxiliary drive component; 32. Auxiliary roll assembly; 321. Pre-rolling seat; 322. Second lateral mounting component; 323. Auxiliary roll body; 324. Cooling layer. Detailed Implementation
[0039] 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.
[0040] After hot rolling and softening, the rigidity of the tubing decreases, and its resistance to bending and deviation deteriorates. Existing rolling equipment only has a main rolling station, and the feed end of the softened tubing is suspended and unsupported. During feeding, radial sway and center deviation are prone to occur. In addition, small protrusions on the outer wall of the tubing directly enter the rolling deformation zone, which will cause local rolling stress concentration, further aggravate the tubing deviation and centering failure, and also cause secondary defects such as local over-rolling and outer wall indentation, affecting the quality of tubing restoration.
[0041] In view of this, the present invention provides a multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes, see reference. Figures 1-10 As shown, the device includes a rolling fixture body 1, which includes a main rolling device 11 and a pre-rolling device 12. The bottoms of the pre-rolling device 12 and the main rolling device 11 are both located on a base 13. The pre-rolling device 12 is located on the feed side of the main rolling device 11. A sliding assembly 14 is connected to the bottom of the pre-rolling device 12 and is mounted on the base 13. The sliding assembly 14 can drive the pre-rolling device 12 to move along the feed direction of the tubing body 10 to adjust the axial distance between the pre-rolling device 12 and the main rolling device 11, adapt to different processing conditions, and optimize the matching relationship between the tubing pre-support and rolling.
[0042] The main rolling mill 11 is equipped with a main roll group 113, which is used to perform multi-roll radial adjustment rolling on the tubing body 10. The pre-rolling mill 12 is equipped with a pre-roll group 123, which is used to center and provide auxiliary support for the tubing body 10 before it enters the main rolling mill 11, reducing the swaying of the softened tubing during feeding and ensuring the coaxial alignment of the tubing. When the tubing body 10 to be repaired passes through the pre-rolling mill 12 and the main rolling mill 11 in sequence, the pre-roll group 123 can also pre-roll the tubing body 10 to eliminate local protrusions on the outer wall of the tubing in advance. The main roll group 113 then performs multi-roll radial adjustment rolling on the pre-rolled tubing body 10 to reduce rolling stress concentration and reduce defects such as indentations in the tubing.
[0043] Specifically, the hot rolling forming process of the heated oil pipe by the main rolling unit 11 is completed by the main frame 111 and the internal roller system structure: the main frame 111 is fixedly installed on the base 13, and three first rolling seats 112 are evenly opened in the circumference inside the frame. Three main rolling roll groups 113 are respectively installed in each of the first rolling seats 112. The installation centers of the three main rolling roll groups 113 intersect on the axial center line of the oil pipe. The three inclined rolls 222 together form a rolling pass, and the oil pipe to be processed passes through the center of the pass.
[0044] Furthermore, the main roll group 113 achieves radial position adjustment of the skew roll 222 through the main drive component 21. Each main roll group 113 is equipped with an independent main drive component 21. The main drive component 21 is fixedly installed on the outer wall of the main frame 111, and its movable end extends into the first roll seat cavity 112 and is fixedly connected to the main roll seat 221. The skew roll 222 is assembled on the side of the main roll seat 221 facing the oil pipe through the first lateral mounting component 223. The main drive component 21 can output linear driving force to push the main roll seat 221 to move in the radial direction of the oil pipe, thereby driving the corresponding skew roll 222 to generate radial displacement synchronously, realizing independent adjustment of the reduction of a single roll.
[0045] Three skew rolls 222 work together to complete the continuous rolling operation. The three skew rolls 222 are all arranged at an inclined angle relative to the axis of the oil pipe. During operation, each skew roll 222 rotates synchronously around its own axis. With the help of the friction between the roll surface and the pipe wall, the oil pipe is driven to make a spiral feed motion along the axial direction. At the same time, in conjunction with the radial pressing action of each skew roll 222, a continuous and uniform rolling force is applied to the outer wall of the oil pipe to repair the corrosion depressions, local protrusions and roundness deviations of the pipe wall, and complete the hot rolling re-forming of the oil pipe.
[0046] Furthermore, the pre-rolling unit 12 adopts a frame structure layout that is coaxial with the main rolling unit 11. The pre-rolling frame 121 is located on the feeding side of the main frame 111. The pre-rolling frame 121 and the main frame 111 are both located on the same base 13. Three second rolling chambers 122 are evenly opened in the circumferential direction inside the pre-rolling frame 121. Three pre-rolling roll groups 123 are respectively installed in each of the second rolling chambers 122 and are circumferentially phase-corresponding to the main rolling roll group 113 in the main frame 111. This structural arrangement can form a front support station before the oil pipe enters the main rolling unit 11, providing guidance and bearing for the softened oil pipe feeding.
[0047] Specifically, the pre-rolling roll group 123 adopts a split structure assembly with the drive component and the roll group. The auxiliary drive component 31 is fixedly installed on the outer wall of the pre-rolling stand 121. Its movable end extends into the second rolling seat cavity 122 and is connected to the auxiliary roll group 32. The auxiliary drive component 31 can output linear driving force to drive the auxiliary roll group 32 to move back and forth along the radial direction of the oil pipe, thereby adjusting the inner diameter of the pre-rolling pass formed by the three auxiliary roll bodies 323 to adapt to the oil pipes to be processed with different outer diameter specifications.
[0048] The auxiliary roller group 32 adopts a roller body design with an elastic mounting structure. The pre-rolling seat 321 is fixedly connected to the movable end of the auxiliary drive component 31. A second lateral mounting component 322 is provided on the side of the pre-rolling seat 321 facing the center of the oil pipe. The auxiliary roller body 323 is rotatably assembled inside the second lateral mounting component 322. The second lateral mounting component 322 adopts an elastic structure (using existing technology, which will not be described in detail here). It can apply an elastic pre-pressure towards the outer wall of the oil pipe to the auxiliary roller body 323. The three auxiliary roller bodies 323 are evenly arranged in the circumferential direction and together form a pre-rolling pass. It can provide uniform circumferential support force when contacting the outer wall of the oil pipe, and at the same time generate a pre-pressure effect on the local protrusions of the outer wall of the oil pipe.
[0049] Among them, the auxiliary drive component 31 on the pre-rolling side adopts a synchronous control mode. This control mode is compatible with the functional positioning of the pre-rolling device 12. The core function of the pre-rolling device 12 is centering support and pre-shaping. It requires the three auxiliary roll bodies 323 to maintain a uniform radial displacement to keep the center of the pre-rolling pass and the axial center of the oil pipe always coincide. When synchronous control is adopted, the three auxiliary drive components 31 can output the same driving stroke synchronously, driving the three auxiliary roll bodies 323 to move radially forward and backward synchronously, ensuring that the pre-rolling pass always maintains a regular circular outline and the center position is fixed, providing uniform circumferential support for the oil pipe, improving the stability of centering and alignment, and ensuring that the pre-pressure degree on each side is consistent, reducing the situation of uneven local pre-pressure.
[0050] Correspondingly, the main drive component 21 on the main rolling side adopts a separate control mode. This control mode is adapted to the rolling operation requirements of the main rolling unit 11. After long-term downhole use, the pipe wall of the corroded oil pipe has uneven corrosion, wall thickness deviation and local deformation. The rolling reduction requirements of different circumferential positions are different. When using separate control, each main drive component 21 can independently adjust the output stroke according to the pipe wall condition at the corresponding position, and drive the corresponding inclined roller component 222 to adjust the radial reduction. The reduction is increased for positions with thicker pipe walls or protrusions, and the reduction is decreased for positions with thinner pipe walls, adapting to the wall thickness differences at different positions of the oil pipe, and improving the uniformity and overall roundness of the pipe wall after rolling.
[0051] A pre-rolling unit 12 is coaxially arranged on the feed side of the main rolling unit 11. Three auxiliary roll bodies 323 are evenly arranged circumferentially inside the pre-rolling stand 121. The second lateral mounting part 322 is an elastic structure that can provide elastic pre-pressure for the auxiliary roll bodies 323. After the oil pipe is softened by hot rolling, its overall rigidity decreases and it is prone to radial sway during the feeding process. The three auxiliary roll bodies 323 surround the outer wall of the oil pipe, which can center and support the oil pipe and limit the radial displacement of the oil pipe. At the same time, it can pre-press and shape the local protrusions on the outer wall of the oil pipe, so that the local high points will produce preliminary plastic deformation, reduce the possibility of radial sway during the feeding process of the softened oil pipe, and reduce the problem of center offset.
[0052] Furthermore, the cooling layer 324 structure inside the auxiliary roll body 323 can regulate the temperature of the roll itself. The cooling layer 324 can adopt a sandwich cooling structure, arranged along the internal circumference of the auxiliary roll body 323, to reduce the working temperature of the auxiliary roll body 323 and slow down the wear rate of the roll under high-temperature conditions. Moreover, the cooling structure only acts on the auxiliary roll body 323 itself, and the cooling medium does not directly contact the oil pipe. The contact area between the auxiliary roll body 323 and the oil pipe is limited, and heat transfer is mainly achieved by the roll body absorbing heat. This will not cause a significant drop in the temperature of the heated oil pipe, and thus will not cause the rigidity of the oil pipe to rebound, affecting the subsequent rolling plasticity.
[0053] In addition, the sliding assembly 14 allows for flexible adjustment of the axial distance between the pre-rolling device 12 and the main rolling device 11. The sliding connector 141 is fixedly installed on the surface of the base 13, and an axially extending sliding cavity 142 is opened inside. The lead screw 143 is arranged axially along the sliding cavity 142. One end of the lead screw 143 is fixedly connected to the motor output shaft fixed to the end of the sliding connector 141. The bottom end of the pre-rolling stand 121 is sleeved on the lead screw 143 and embedded in the sliding cavity 142, forming a sliding fit with the sliding cavity 142. The motor drives the lead screw 143. When 43 rotates, it can drive the pre-rolling stand 121 to move axially in a straight line along the sliding cavity 142, thereby adjusting the axial distance between the pre-rolling device 12 and the main rolling device 11. The purpose of adjusting this distance is to adjust the distance between the pre-support point and the main rolling point according to the rigidity difference of oil pipes with different diameters and wall thicknesses. For oil pipes with lower rigidity, the distance can be reduced to shorten the length of the suspended section of the oil pipe and improve the feeding stability. For oil pipes with relatively higher rigidity, the distance can be appropriately increased to reserve sufficient pre-forming operation space to adapt to different processing conditions.
[0054] During operation, the target axial distance between the pre-rolling unit 12 and the main rolling unit 11 is determined based on the specifications and rigidity of the oil pipe to be processed and after softening. Then, the drive motor at the end of the sliding assembly 14 is started. The motor output torque drives the lead screw 143 to rotate at a constant speed around its own axis in the sliding cavity 142. During the rotation of the lead screw 143, the rotational motion is converted into the linear motion of the pre-rolling stand 121 through the threaded transmission pair, which drives the pre-rolling stand 121 to move smoothly along the guide direction of the sliding cavity 142. When the pre-rolling stand 121 moves to the preset target position, the motor stops running, and the pre-rolling stand 121 remains in the current position, completing the adjustment of the axial distance.
[0055] The dual-station rolling structure with front and rear tandem can achieve a graded rolling effect for the oil pipe: the pre-rolling device 12 and the main rolling device 11 are arranged in a front-to-back tandem station structure. The pre-rolling roll group 123 first performs centering guidance and local protrusion pre-rolling treatment on the oil pipe body 10, eliminating local high points on the outer wall of the oil pipe in advance, so that the outer wall contour of the oil pipe tends to be flat. Each main drive component 21 of the main rolling roll group 113 adopts an individual control mode, which can independently adjust the radial position of each inclined roll 222 to adapt to the wall thickness difference at different positions of the oil pipe. Multi-roll radial adjustment rolling is carried out on the oil pipe after pre-forming treatment. This structure can reduce the phenomenon of rolling stress concentration caused by local protrusions directly entering the rolling deformation zone, reduce the probability of secondary defects such as local over-rolling and outer wall indentation of the pipe, and improve the shape quality and dimensional accuracy of the oil pipe after restoration.
[0056] Working principle:
[0057] First, the tubing body 10 to be repaired is heated to the hot rolling temperature to soften it but keep it solid. According to the process requirements, the axial distance between the pre-rolling device 12 and the main rolling device 11 is adjusted by the sliding component 14. Then, the tubing body 10 enters the pre-rolling device 12 along the feeding direction. The three pre-rolling roll groups 123 in the pre-rolling stand 121 move radially under the synchronous drive of the auxiliary drive component 31. The three auxiliary roll bodies 323 form a hole and are lightly pressed against the outer wall of the tubing body 10 under the elastic pre-pressure of the second lateral mounting component 322. The tubing body 10 is centered, assisted in support and alignment, and local protrusions are pre-pressed and shaped.
[0058] After pre-rolling, the tubing body 10 enters the main rolling mill 11. The three main roll groups 113 on the main frame 111 are located in the three first rolling chambers 112 respectively. The main drive unit 21 controls and drives the skew roll group 22 to move radially. The three skew rolls 222 cooperate to form a skew rolling pass, and perform multi-roll radial adjustment rolling on the tubing body 10, so that the tubing body 10 undergoes plastic deformation during rotation and forward movement, repairing the outer diameter, wall thickness and roundness. Finally, the rolled tubing body 10 is output from the main rolling mill 11.
[0059] 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 multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes, comprising a rolling fixture body (1), wherein the rolling fixture body (1) includes a main rolling device (11) and a pre-rolling device (12), the bottoms of the pre-rolling device (12) and the main rolling device (11) are both located on a base (13), characterized in that: The pre-rolling device (12) is located on the feed side of the main rolling device (11). The bottom of the pre-rolling device (12) is connected to a sliding assembly (14), and the sliding assembly (14) is mounted on the base (13). The sliding assembly (14) can drive the pre-rolling device (12) to move along the feed direction of the oil pipe body (10) to adjust the axial distance between the pre-rolling device (12) and the main rolling device (11). The main rolling device (11) is equipped with a main rolling roll group (113) inside, which is used to perform multi-roll radial adjustment rolling on the tubing body (10). The pre-rolling device (12) is equipped with a pre-rolling roll group (123) inside, which is used to center and provide auxiliary support for the tubing body (10) before it enters the main rolling device (11). When the oil pipe body (10) to be repaired passes through the pre-rolling device (12) and the main rolling device (11) in sequence, the pre-rolling roll group (123) can first pre-roll the oil pipe body (10), and the main rolling roll group (113) then performs multi-roll radial adjustment rolling on the pre-rolled oil pipe body (10).
2. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 1, characterized in that: The main rolling device (11) includes a main frame (111) mounted on a base (13). The main frame (111) has three first rolling chambers (112). The main roll group (113) has three rolls, which are respectively installed in the three first rolling chambers (112) to perform multi-roll radial adjustment rolling on the oil pipe body (10).
3. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 2, characterized in that: The main roll assembly (113) includes a main drive unit (21), which is fixedly mounted on the main frame (111). The movable end of the main drive unit (21) is equipped with a slant roll assembly (22), which is used to drive the slant roll assembly (22) to move radially along the oil pipe body (10).
4. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 3, characterized in that: The skew roll group (22) includes a main roll seat (221) fixedly connected to the movable end of the main drive member (21). A first lateral mounting member (223) is provided at the end of the main roll seat (221) away from the main drive member (21). Skew roll members (222) are assembled in the first lateral mounting member (223). The three skew roll members (222) cooperate to form a die for skew rolling the oil pipe body (10).
5. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 3, characterized in that: The pre-rolling device (12) includes a pre-rolling stand (121), which is located on the feed side of the main frame (111). The pre-rolling stand (121) has three second rolling chambers (122), and the pre-rolling roll group (123) has three units, which are respectively installed in the three second rolling chambers (122).
6. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 5, characterized in that: The pre-rolling roll group (123) includes an auxiliary drive component (31), which is fixedly installed on the pre-rolling stand (121). The movable end of the auxiliary drive component (31) is equipped with an auxiliary roll group (32).
7. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 6, characterized in that: The auxiliary roller group (32) includes a pre-rolling seat (321) fixedly connected to the movable end of the auxiliary drive (31). A second lateral mounting member (322) is provided at one end of the pre-rolling seat (321) away from the auxiliary drive (31). An auxiliary roller body (323) is assembled in the second lateral mounting member (322). The second lateral mounting member (322) is an elastic structure that can provide elastic pre-pressure to the auxiliary roller body (323). The three auxiliary roller bodies (323) cooperate to form a hole for centering auxiliary support and pre-pressure shaping of the oil pipe body (10).
8. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 6, characterized in that: The auxiliary drive (31) is synchronously controlled to synchronously adjust the radial position of the three auxiliary roller bodies (323); the main drive (21) of the main roll group (113) is individually controlled to independently adjust the radial position of the three inclined rollers (222).
9. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 7, characterized in that: The auxiliary roller body (323) is provided with a cooling layer (324), and the cooling layer (324) can be circulated with a cooling medium.
10. The multi-roll radial adjustment rolling fixture for hot rolling and refining of corroded oil pipes according to claim 5, characterized in that: The sliding assembly (14) includes a sliding connector (141) mounted on the surface of the base (13). A sliding cavity (142) is provided in the sliding connector (141). A lead screw (143) is installed in the sliding cavity (142). One end of the lead screw (143) is fixedly connected to the motor output shaft fixedly mounted at the end of the sliding connector (141). The bottom end of the pre-rolling stand (121) is movably sleeved on the surface of the lead screw (143). When the motor drives the lead screw (143) to rotate, it drives the pre-rolling stand (121) to move along the sliding cavity (142) to adjust the axial distance between the pre-rolling device (12) and the main rolling device (11).