A device for controlling wall thickness accuracy of a hot-rolled seamless steel pipe

Abstract

The utility model discloses a kind of hot-rolled seamless steel pipe wall thickness precision control device, it is related to hot-rolled seamless steel pipe production technical field, including first fixed frame, second fixed frame, two symmetrical conveyors and roll that are arranged in the inside of piercer, the inside upper end of first fixed frame is rotatably equipped with driving shaft, driving shaft and the output shaft of two conveyors are fixedly equipped with synchronous wheel, synchronous wheel outside transmission is equipped with synchronous chain, the inside of second fixed frame is rotatably equipped with rotating column, rotating column outer wall is fixedly equipped with connecting frame, connecting frame rotatably equipped in the output shaft outside of roll, the upper end of second fixed frame is fixedly equipped with mounting plate. The utility model can be according to the wall thickness requirement of required hot-rolled seamless steel pipe to adjust the transverse stroke of oil cylinder push rack, so that connecting frame and the rotation angle of roll driven by gear are adjusted, to control the falling height of roll, to change the forming wall thickness of seamless steel pipe with two conveyors.

Description

Technical Field

[0001] This utility model relates to the field of hot-rolled seamless steel pipe production technology, specifically to a device for controlling the wall thickness accuracy of hot-rolled seamless steel pipe. Background Technology

[0002] Hot-rolled seamless steel pipe is a tubular steel product with no joints, produced through hot rolling. It features high strength, good toughness, and strong pressure resistance, and is widely used in petroleum, chemical, power, machinery manufacturing, and construction engineering. During the hot rolling process of seamless steel pipe, two conveying rollers with the same direction of rotation are used to transport the bar stock. During this process, the top roller squeezes the bar stock, so that the bar stock is formed into a steel pipe of the corresponding wall thickness when it passes through the mandrel. At this time, the wall thickness of the steel pipe depends on the downward pressure height of the roller. However, existing rollers are generally driven by hydraulic cylinders, but the driving stroke of hydraulic cylinders is fixed, which can only perform hot rolling of steel pipes with fixed wall thickness, reducing the versatility of the hot rolling process of the piercing mill. Summary of the Invention

[0003] In view of the problems existing in the above-mentioned hot-rolled seamless steel pipe wall thickness accuracy control device, this utility model is proposed.

[0004] Therefore, the purpose of this utility model is to provide a device for controlling the wall thickness accuracy of hot-rolled seamless steel pipes, which solves the problem that existing piercing mills cannot adjust the downward pressing position of the rolls to change the wall thickness of the steel pipe.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A device for controlling the wall thickness accuracy of hot-rolled seamless steel pipe includes a first fixed frame, a second fixed frame, two symmetrically arranged conveying rollers and a rolling mill, all located inside a piercing mill. A drive shaft is rotatably mounted on the upper inner end of the first fixed frame. Synchronous pulleys are fixedly fitted on the output shafts of the drive shaft and the two conveying rollers. A synchronous chain is driven on the outer side of the synchronous pulleys. A rotating column is rotatably mounted inside the second fixed frame. A connecting frame is fixedly fitted on the outer wall of the rotating column. The connecting frame is rotatably mounted on the outside of the output shaft of the rolling mill.

[0007] The upper end of the second fixing frame is fixedly provided with a mounting plate, the outer wall of the mounting plate is fixedly provided with a hydraulic cylinder, the output shaft end of the hydraulic cylinder is fixedly provided with a connecting plate, the inside of the connecting plate is provided with an adjustment mechanism, and a rack is provided through the adjustment mechanism. The rack is fitted with a gear, and the gear is fixedly sleeved with the rotating column.

[0008] Preferably, the adjusting mechanism includes an adjusting screw, the connecting plate has a through hole inside, the adjusting screw is rotatably disposed in the through hole, the adjusting screw has a slider threadedly sleeved on its wall, a fixing plate is fixedly disposed on the back side of the slider, and a compression separation mechanism is provided between the fixing plate and the rack.

[0009] Preferably, the compression separation mechanism includes a guide block, the fixed plate has a guide hole inside, the guide block is fixedly connected to the rack and slidably disposed in the guide hole, and a guide spring is fixedly disposed between the guide block and the inner wall of the guide hole.

[0010] Preferably, the cross-section of the guide block is T-shaped.

[0011] Furthermore, the end of the adjusting screw extends through the connecting plate and is fixedly equipped with a rotating block.

[0012] Preferably, the outer wall of the slider is in contact with the inner wall of the perforation.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0014] 1. This utility model, through the provision of a second fixed frame, support column, connecting frame, oil cylinder, rack, gear, adjustment mechanism and compression separation mechanism, can adjust the lateral stroke of the oil cylinder pushing the rack according to the required wall thickness of the hot-rolled seamless steel pipe, so that the rotation angle of the connecting frame and the roll driven by the gear can be adjusted, thereby controlling the drop height of the roll, and thus cooperating with the two conveying rollers to change the forming wall thickness of the seamless steel pipe. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 For the present utility model Figure 1 Enlarged schematic diagram of part A.

[0018] Figure 3 This is a three-dimensional structural diagram of the guide block of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. First fixed frame; 2. Second fixed frame; 3. Conveyor roller; 4. Roller; 5. Drive shaft; 6. Synchronous pulley; 7. Synchronous chain; 8. Rotating column; 9. Connecting frame; 10. Mounting plate; 11. Hydraulic cylinder; 12. Connecting plate; 13. Rack; 14. Gear; 15. Adjusting screw; 16. Slider; 17. Fixed plate; 18. Guide block; 19. Guide spring; 20. Rotating block. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] This utility model discloses a device for controlling the wall thickness accuracy of hot-rolled seamless steel pipes.

[0023] This utility model provides, for example Figure 1-3 The device for controlling the wall thickness accuracy of hot-rolled seamless steel pipe shown includes a first fixed frame 1, a second fixed frame 2, two symmetrically arranged conveying rollers 3 and rolling rollers 4, all located inside a piercing mill. A drive shaft 5 is rotatably mounted on the upper part of the interior of the first fixed frame 1. Synchronous pulleys 6 are fixedly mounted on the output shafts of the drive shaft 5 and the two conveying rollers 3. A synchronous chain 7 is driven on the outside of the synchronous pulleys 6. A rotating column 8 is rotatably mounted inside the second fixed frame 2. A connecting frame 9 is fixedly mounted on the outer wall of the rotating column 8. The connecting frame 9 is rotatably mounted on the outside of the output shaft of the rolling rollers 4.

[0024] The upper end of the second fixed frame 2 is fixedly provided with a mounting plate 10, the outer wall of the mounting plate 10 is fixedly provided with a hydraulic cylinder 11, the output shaft end of the hydraulic cylinder 11 is fixedly provided with a connecting plate 12, the connecting plate 12 is provided with an adjustment mechanism, and a rack 13 is provided through the adjustment mechanism. The rack 13 is fitted with a gear 14, and the gear 14 is fixedly sleeved with the rotating column 8. The adjustment mechanism includes an adjustment screw 15. The connecting plate 12 is provided with a through hole, and the adjustment screw 15 is rotatably disposed in the through hole. The end of the adjustment screw 15 passes through the connecting plate 12 and is fixedly provided with a rotating block 20. The rod wall of the adjustment screw 15 is threadedly fitted with a slider 16. The outer wall of the slider 16 contacts and engages with the inner wall of the through hole. A fixed plate 17 is fixedly provided on the back side of the slider 16, and a compression separation mechanism is provided between the fixed plate 17 and the rack 13.

[0025] To enable rapid disengagement of the rack and gear, the lateral movement position of the rack is adjusted, thereby regulating the meshing range of the rack and gear, and adjusting the downward pressure height of the rolls, such as... Figure 1-2 As shown, the compression separation mechanism includes a guide block 18 with a T-shaped cross-section. A guide hole is provided inside the fixing plate 17. The guide block 18 is fixedly connected to the rack 13 and slidably disposed in the guide hole. A guide spring 19 is fixedly provided between the guide block 18 and the inner wall of the guide hole.

[0026] Working principle: The drive shaft 5 drives two conveying rollers 3 to rotate synchronously through the synchronous wheel 6 and synchronous chain 7 to convey the bar stock. According to the target wall thickness, the rotating block 20 is rotated to make the adjusting screw 15 rotate, which drives the slider 16 and the fixed plate 17 to move to adjust the initial meshing position of the rack 13 and the gear 14. The hydraulic cylinder 11 pushes the connecting plate 12 to make the rack 13 move laterally and mesh with the gear 14. The gear 14 drives the rotating column 8 and the connecting frame 9 to rotate to adjust the falling height of the roller 4 (for example, when the rack 13 moves to the left, the gear 14 rotates counterclockwise to make the roller 4 press down to increase the degree of extrusion and reduce the wall thickness, and vice versa, it moves up to reduce the degree of extrusion and increase the wall thickness). During adjustment, the guide block 18 slides along the guide hole of the fixed plate 17 under the action of the guide spring 19, which can temporarily separate the rack 13 and the gear 14 for quick position adjustment. After the adjustment is completed, the guide spring 19 resets to make the rack 13 and the gear 14 re-mesh. Thus, by controlling the falling height of the roller 4, the deformation of the bar stock is changed to achieve precise wall thickness adjustment.

[0027] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for controlling the wall thickness accuracy of hot-rolled seamless steel pipe, comprising a first fixed frame (1), a second fixed frame (2), two symmetrically arranged conveying rollers (3) and rolling rollers (4) disposed inside a piercing mill, characterized in that, The upper part of the first fixed frame (1) is rotatably provided with a drive shaft (5). The output shafts of the drive shaft (5) and the two conveying rollers (3) are all fixedly fitted with synchronous wheels (6). The synchronous wheel (6) is driven by a synchronous chain (7). The interior of the second fixed frame (2) is rotatably provided with a rotating column (8). The outer wall of the rotating column (8) is fixedly fitted with a connecting frame (9). The connecting frame (9) is rotatably fitted outside the output shaft of the roller (4). The upper end of the second fixed frame (2) is fixedly provided with a mounting plate (10), the outer wall of the mounting plate (10) is fixedly provided with a hydraulic cylinder (11), the output shaft end of the hydraulic cylinder (11) is fixedly provided with a connecting plate (12), the connecting plate (12) is provided with an adjustment mechanism, and a rack (13) is provided through the adjustment mechanism. The rack (13) is fitted with a gear (14), and the gear (14) is fixedly sleeved with the rotating column (8).

2. The hot-rolled seamless steel pipe wall thickness accuracy control device according to claim 1, characterized in that, The adjustment mechanism includes an adjustment screw (15), and the connecting plate (12) has a through hole inside. The adjustment screw (15) is rotatably disposed in the through hole. The adjustment screw (15) has a slider (16) threaded on its wall. A fixing plate (17) is fixedly disposed on the back side of the slider (16). A compression separation mechanism is provided between the fixing plate (17) and the rack (13).

3. The hot-rolled seamless steel pipe wall thickness accuracy control device according to claim 2, characterized in that, The compression separation mechanism includes a guide block (18), and a guide hole is provided inside the fixed plate (17). The guide block (18) is fixedly connected to the rack (13) and slidably disposed in the guide hole. A guide spring (19) is fixedly provided between the guide block (18) and the inner wall of the guide hole.

4. The hot-rolled seamless steel pipe wall thickness accuracy control device according to claim 3, characterized in that, The guide block (18) has a T-shaped cross-section.

5. The hot-rolled seamless steel pipe wall thickness accuracy control device according to claim 2, characterized in that, The end of the adjusting screw (15) extends through the connecting plate (12) and is fixedly provided with a rotating block (20).

6. The hot-rolled seamless steel pipe wall thickness accuracy control device according to claim 2, characterized in that, The outer wall of the slider (16) is in contact with the inner wall of the perforation.

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