Automatic adjusting device for roll gap of hot rolling seamless steel pipe mill

Abstract

The utility model relates to steel pipe machining device technical field discloses a kind of hot-rolled seamless steel tube rolling mill roll gap automatic regulating device, including bottom plate, the bottom plate top is fixedly connected with the support frame that is symmetrical left and right, roller assembly is arranged between the support frame, adjusting assembly is arranged in the roller assembly two sides, the adjusting assembly includes moving block, the support frame top is fixedly connected with the drive motor that is symmetrical left and right, both sides drive motor output end are fixedly connected with threaded rod, hydraulic rod is arranged between both sides drive motor, the hydraulic rod output end is fixedly connected in the moving block top center position.In the utility model, first by hydraulic rod output end driving moving block preliminary roughly ascends, then by drive motor driving threaded rod rotation, promote moving block driving movable roller to upward refinement displacement, to adjust the spacing between fixed roller and movable roller quickly and stably, solve the problem of low precision in traditional adjustment mode, improve rolling mill roll gap adjustment efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of steel pipe processing equipment, and in particular to an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill. Background Technology

[0002] In the production of hot-rolled seamless steel pipes, the precision of the mill roll gap directly determines the uniformity of the pipe's wall thickness and dimensional accuracy. Therefore, the roll gap adjustment device is a core component of the mill. With the increasing demand for high-strength, high-precision steel pipes, higher requirements are placed on the response speed, control precision, and stability of the roll gap adjustment. This paper presents an automatic roll gap adjustment device for hot-rolled seamless steel pipe mills, designed to achieve rapid adjustment and dynamic compensation of the roll gap through optimized mechanical structure design. This adapts to the rolling requirements of steel pipes of different specifications, improving production efficiency and product quality. In existing technologies, rolling mill roll gap adjustment devices mostly employ a single drive structure, commonly either purely mechanical or purely hydraulic. Purely mechanical drives typically achieve roll gap adjustment through gears, racks, or a single screw mechanism, relying on manual or single-motor drive for displacement control. Purely hydraulic drives, on the other hand, directly push the roll bearing housing via a hydraulic cylinder, utilizing the pressure of hydraulic oil to change the roll gap. The underlying principle is that the force or displacement output from a single power source drives the relative movement of the rolls, thereby altering the roll gap size. However, existing technologies have significant shortcomings: a single-drive adjustment method struggles to balance adjustment accuracy and response speed. While pure mechanical transmission can guarantee a certain level of accuracy, the adjustment process is cumbersome and the response is slow, failing to meet the demands of rapid specification changes in production. Pure hydraulic drives, although offering faster adjustment speeds, are susceptible to fluctuations in hydraulic oil flow, resulting in low roll gap control accuracy. Furthermore, long-term use can lead to leaks due to pressure shocks, severely impacting the stability of the rolling mill. Therefore, an automatic roll gap adjustment device for hot-rolled seamless steel pipe mills is proposed to address these issues. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill, which aims to improve the problems of low accuracy and slow response in the existing adjustment methods.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill includes a base plate, on the top of which a symmetrical support frame is fixedly connected, a roll assembly is arranged between the support frames, and adjustment components are arranged on both sides of the roll assembly. The adjustment assembly includes a movable block with both ends slidably connected inside the support frame. Movable devices are arranged on the left and right sides inside the movable block. Symmetrical drive motors are fixedly connected to the top of the support frame. Threaded rods are fixedly connected to the output ends of both drive motors. A fixed seat is arranged below the threaded rod, and the bottom of the fixed seat is fixedly connected to the top of the roll assembly. One bottom end of the threaded rod is rotatably connected to the inside of the fixed seat. The inner wall of the movable device is threadedly connected to the outer wall of the threaded rod. A hydraulic rod is arranged between the two drive motors. The bottom of the hydraulic rod is fixedly connected to the center position of the top of the support frame, and the output end of the hydraulic rod is fixedly connected to the center position of the top of the movable block.

[0005] As a further description of the above technical solution: The roll assembly includes a movable roll, and a support seat is provided on both the left and right sides of the movable roll. The outer walls of the support seats on both sides are fixedly connected to the inside of the movable blocks on both sides, and both ends of the movable roll are rotatably connected to the inside of the support seats.

[0006] As a further description of the above technical solution: A fixed roller is provided below the movable roller, and fixed boxes are provided on both the left and right sides of the fixed roller. The outer wall of the fixed box is fixedly connected to the inner wall of the support frame, and both ends of the fixed roller are rotatably connected to the inside of the fixed box.

[0007] As a further description of the above technical solution: The bottom of each of the multiple fixed bases is fixedly connected to the top of the fixed box, and a controller is fixedly connected to the outer wall of one side of the support frame.

[0008] As a further description of the above technical solution: Guide grooves are provided on both sides of the inner wall of the support frame on both sides, and limit blocks are fixedly connected to both sides of the moving block. The outer wall of the limit block is slidably connected to the inner wall of the guide groove.

[0009] As a further description of the above technical solution: A left-right symmetrical upper buffer spring is provided above the limiting block, and a left-right symmetrical lower buffer spring is provided below the limiting block.

[0010] As a further description of the above technical solution: One end of the upper buffer spring is fixedly connected to the inside of the support frame, and the other end of the upper buffer spring is fixedly connected to the top of the limiting block.

[0011] As a further description of the above technical solution: One end of the lower buffer spring is fixedly connected to the lower part of the support frame, and the other end of the lower buffer spring is fixedly connected to the bottom of the limiting block.

[0012] This utility model has the following beneficial effects: 1. In this utility model, the hydraulic rod output end first drives the moving block to rise roughly, and then the drive motor drives the threaded rod to rotate. The thread action causes the moving block to refine its displacement. The displacement of the moving blocks on both sides drives the movable roller to move upward, thereby quickly and stably adjusting the gap between the fixed roller and the movable roller. This solves the problems of low precision and slow response in the traditional adjustment method and improves the efficiency and stability of the rolling mill roll gap adjustment.

[0013] 2. In this utility model, the slight displacement caused by the thermal expansion of the movable roller will push the moving block and the limiting block to move, causing the spring to deform. Its elastic force pushes the moving block to reset in the opposite direction, automatically offsetting the deformation. This solves the problems of difficult correction of roller gap deviation and large fluctuation of steel pipe size accuracy caused by thermal deformation in traditional adjustment, and improves rolling stability and product qualification rate. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of an automatic roll gap adjustment device for hot-rolled seamless steel pipe mills proposed in this utility model; Figure 2 This is a schematic diagram of the support frame structure of an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill proposed in this utility model; Figure 3 This is a schematic diagram of the threaded rod structure of an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill proposed in this utility model; Figure 4 This is a schematic diagram of the moving block structure of an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill proposed in this utility model; Figure 5 This is a schematic diagram of the guide groove structure of an automatic adjustment device for the roll gap of a hot-rolled seamless steel pipe mill proposed in this utility model.

[0015] Legend: 1. Base plate; 2. Support frame; 3. Fixed box; 4. Controller; 5. Fixed roller; 6. Movable roller; 7. Bearing seat; 8. Moving block; 9. Drive motor; 10. Threaded rod; 11. Movable device; 12. Fixed seat; 13. Hydraulic rod; 14. Limit block; 15. Guide groove; 16. Upper buffer spring; 17. Lower buffer spring. Detailed Implementation

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

[0017] Reference Figures 1-5 This utility model provides an embodiment of an automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill, comprising a base plate 1, which supports the entire structure of the device and ensures the stability of the equipment during operation. Symmetrical support frames 2 are bolted to the top of the base plate 1. The support frames 2 are welded from H-beams, and their height is designed according to the roll size. As the main load-bearing structure of the device, they are used to install the roll assembly and adjustment assembly. The roll assembly, located between the support frames 2, is the core component for realizing steel pipe rolling, including a movable roll 6 and a fixed roll 5. The movable roll 6 cooperates with the fixed roll 5. The steel pipe is rolled. The bearing seats 7 on both sides of the movable roller 6 are made of cast steel and are equipped with self-aligning roller bearings inside. The outer wall is fixed to the inside of the moving blocks 8 on both sides by bolts. They are used to support the movable roller 6 and allow it to rotate. The fixed roller 5 below the movable roller 6 is used to provide a rolling reference surface. The fixed boxes 3 on both sides of the fixed roller 5 are equipped with bearing seats and motors inside. The outer wall is fixed to the inner wall of the support frame 2 by bolts. They are used to fix and support the fixed roller 5 and ensure its position is stable. Both the movable roller 6 and the fixed roller 5 are existing technologies and will not be described in detail in this article. The adjusting components on both sides of the movable roller 6 and the fixed roller 5 are used to adjust the roller gap between them. The moving block 8 of the adjusting component has a rectangular structure, with both ends forming a sliding fit with the inside of the support frame 2, and is used to drive the bearing seat 7 and the movable roller 6 to move up and down. The movable devices 11 on the left and right sides inside the moving block 8 are made of 45 steel and have internal threads machined on the inner wall. They fit with the external threads on the outer wall of the threaded rod 10, converting the rotational motion of the threaded rod 10 into linear motion. The left and right symmetrical drive motors 9, which are three-phase asynchronous motors, are fixedly connected to the top of the support frame 2 by bolts. They are connected to the threaded rod 10 through a reducer to drive the threaded rod 10 to rotate. The drive motors 9 are existing technology. The threaded rod 10, fixedly connected to the output end of the drive motor 9, has its bottom end rotatably connected to the fixed seat 12 via a bearing, for transmitting driving force. The fixed seat 12 below the threaded rod 10 is bolted to the top of the fixed box 3, supporting the bottom of the threaded rod 10 and ensuring stable rotation. The hydraulic rod 13 between the two drive motors 9 has its bottom bolted to the center of the top of the support frame 2, and its output end is fixedly connected to the center of the top of the moving block 8 via a flange, providing power for rapid lifting and lowering of the moving block 8 to achieve coarse adjustment of the roll gap. The hydraulic rod 13 is existing technology and will not be described in detail here. The controller 4, bolted to the outer wall of one side of the support frame 2, receives sensor signals and controls the movement of the drive motor 9 and the hydraulic rod 13 to achieve roll gap adjustment. The controller 4 is existing technology and will not be described in detail here.

[0018] The guide grooves 15 on both sides of the inner wall of the two support frames 2 are milled to provide guidance for the limit blocks 14. The limit blocks 14, which are fixed to the left and right sides of the moving block 8 by bolts, form a clearance fit with the guide grooves 15. The outer wall is slidably connected to the inner wall of the guide grooves 15 to limit the movement direction of the moving block 8 and ensure that it can only move up and down. The left and right symmetrical upper buffer springs 16 above the limit blocks 14 and the lower buffer springs 17 below the limit blocks 14 are both made of spring steel. One end of the upper buffer spring 16 is welded to the upper inside of the support frame 2 and the other end is welded to the top of the limit block 14; one end of the lower buffer spring 17 is welded to the lower inside of the support frame 2 and the other end is welded to the bottom of the limit block 14. They are used to absorb the impact force generated by the thermal deformation of the movable roller 6 and achieve dynamic compensation. Working principle: When using the automatic roll gap adjustment device of the hot-rolled seamless steel pipe mill, when it is necessary to increase the gap between the fixed roll 5 and the movable roll 6, the operator starts the drive motor 9 and hydraulic rod 13 on the top of the support frame 2 on both sides through the controller 4. First, the output end of the hydraulic rod 13 will drive the moving block 8 to rise slightly. Then, the drive motor 9 drives the threaded rod 10 to rotate. The rotation of the threaded rod 10 causes the movable device 11 to make a fine displacement through the action of the thread, which in turn drives the moving block 8 to move. The displacement of the moving blocks 8 on both sides also drives the movable roll 6 to move upward, thereby achieving the effect of quickly and stably adjusting the gap between the fixed roll 5 and the movable roll 6. When adjusting the gap between the fixed roller 5 and the movable roller 6, the moving blocks 8 at both ends of the movable roller 6 and the limiting blocks 14 on both sides of their left and right sides will slide synchronously in the guide grooves 15 on both sides of the inner wall of the support frame 2. The displacement of the limiting blocks 14 simultaneously causes the upper buffer springs 16 and the lower buffer springs 17 on their upper and lower sides to be stretched or compressed. When the movable roller 6 is heated and expanded during operation, the resulting slight displacement will push the moving blocks 8 to move as well. The displacement of the moving blocks 8 drives the limiting blocks 14 to move, which in turn causes the upper buffer springs 16 and the lower buffer springs 17 to be further stretched or compressed slightly. The elastic force of the upper buffer springs 16 and the lower buffer springs 17 pushes the moving blocks 8 back to their original position, automatically offsetting the deformation of the movable roller 6, thereby achieving real-time dynamic compensation for the roller gap deviation caused by the thermal deformation of the movable roller 6.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill, comprising a base plate (1), characterized in that: The bottom plate (1) is fixedly connected to a left and right symmetrical support frame (2) at the top, and a roller assembly is provided between the support frames (2). Adjustment components are provided on both sides of the roller assembly. The adjustment assembly includes a movable block (8), with both ends of the movable block (8) slidably connected inside the support frame (2). Movable devices (11) are provided on the left and right sides inside the movable block (8). The top of the support frame (2) is fixedly connected to symmetrical drive motors (9). The output ends of the drive motors (9) on both sides are fixedly connected to threaded rods (10). A fixed seat (12) is provided below the threaded rod (10). The bottom of the fixed seat (12) is fixedly connected to the top of the roll assembly. One end of the bottom of the threaded rod (10) is rotatably connected to the inside of the fixed seat (12). The inner wall of the movable device (11) is threadedly connected to the outer wall of the threaded rod (10). A hydraulic rod (13) is provided between the drive motors (9) on both sides. The bottom of the hydraulic rod (13) is fixedly connected to the center position of the top of the support frame (2). The output end of the hydraulic rod (13) is fixedly connected to the center position of the top of the movable block (8).

2. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 1, characterized in that: The roll assembly includes a movable roll (6), and a bearing seat (7) is provided on both the left and right sides of the movable roll (6). The outer walls of the bearing seats (7) on both sides are fixedly connected to the inside of the movable blocks (8) on both sides. Both ends of the movable roll (6) are rotatably connected to the inside of the bearing seats (7).

3. The automatic roll gap adjustment device for hot-rolled seamless steel pipe mills according to claim 2, characterized in that: A fixed roller (5) is provided below the movable roller (6). Fixed boxes (3) are provided on both the left and right sides of the fixed roller (5). The outer wall of the fixed box (3) is fixedly connected to the inner wall of the support frame (2). Both ends of the fixed roller (5) are rotatably connected inside the fixed box (3).

4. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 3, characterized in that: The bottom of each of the multiple fixed seats (12) is fixedly connected to the top of the fixed box (3), and a controller (4) is fixedly connected to the outer wall of the support frame (2) on one side.

5. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 4, characterized in that: The inner walls of the support frame (2) on both sides are provided with guide grooves (15), and the moving block (8) is fixedly connected to the left and right sides with limit blocks (14). The outer wall of the limit block (14) is slidably connected to the inner wall of the guide groove (15).

6. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 5, characterized in that: A left-right symmetrical upper buffer spring (16) is provided above the limiting block (14), and a left-right symmetrical lower buffer spring (17) is provided below the limiting block (14).

7. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 6, characterized in that: One end of the upper buffer spring (16) is fixedly connected to the inside of the support frame (2) and the other end of the upper buffer spring (16) is fixedly connected to the top of the limiting block (14).

8. The automatic roll gap adjustment device for a hot-rolled seamless steel pipe mill according to claim 7, characterized in that: One end of the lower buffer spring (17) is fixedly connected to the lower part of the support frame (2), and the other end of the lower buffer spring (17) is fixedly connected to the bottom of the limiting block (14).

Images