Diameter increasing and wall reducing device of seamless steel pipe hot mill

Abstract

The utility model relates to a diameter-increasing and wall-reducing device, which belongs to the technical field of steel pipe processing, in particular to a diameter-increasing and wall-reducing device of a seamless steel pipe hot mill, which comprises a support base and a fixed base, an expansion table and a driving table are respectively and fixedly connected to the upper surface of the support base, and a plurality of expansion plates are arranged on one side of the expansion table. An expansion assembly used for driving the expansion plate is arranged on the driving table, a fixing assembly used for assisting in fixing the steel pipe is arranged on the fixing base, and an auxiliary driving assembly used for assisting in rotating the steel pipe is arranged in the fixing base. According to the steel pipe diameter-increasing device, the expanding assembly can be matched with the auxiliary driving assembly for driving the steel pipe to rotate, so that the steel pipe is stressed more uniformly in the treatment process, the diameter-increasing uniformity of the steel pipe is ensured, the diameter-increasing effect of the steel pipe is ensured, and the problem that the diameter-increasing effect of existing steel pipe diameter-increasing equipment is poor is solved.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe processing technology, and in particular to a device for increasing diameter and reducing wall thickness in a hot rolling mill for seamless steel pipes. Background Technology

[0002] Steel pipes are widely used in industry, but during the use of steel pipes, there are often leftover materials. In order to save costs and recycle resources, steel pipes are usually reprocessed using appropriate equipment to increase the diameter and reduce the wall thickness to change the pipe diameter and recycle unsold steel pipes.

[0003] In the prior art, such as the seamless steel pipe diameter-increasing and wall-reducing hot rolling mill disclosed in Chinese Patent No. CN216540195U, a base is included. A steel pipe frame is provided at the upper end of the base, and a rolling mechanism is provided directly below the steel pipe frame. A heating and softening mechanism is provided at the center of the steel pipe frame. Columns are fixedly connected to both sides of the upper end of the base, and a turntable is rotatably connected to the front side of the upper end of the rear column. This patent, through the steel pipe frame and support rod, allows seamless steel pipes to be directly sleeved onto the outer wall of the support rod from the front of the device, facilitating the loading and unloading of seamless steel pipes. Through the rolling mechanism, the rolling mechanism cooperates with the lowest support rod to uniformly roll the seamless steel pipe sleeved on the support rod, thereby achieving the effect of increasing diameter and reducing wall thickness. Furthermore, the cooperation between the rolling mechanism and the support rod ensures that the pipe wall of the seamless steel pipe is subjected to uniform stress. The finished steel pipe after rolling can be rounded by a rounding machine, thereby improving the yield and effectively improving economic benefits.

[0004] However, this patent still has shortcomings. The patent uses multiple steel pipes to increase diameter simultaneously and uses a steel pipe frame as a support for the steel pipes. When encountering steel pipes with larger diameters, the support area of ​​the steel pipe frame for the heavier steel pipes is relatively small. At this time, after softening the steel pipes by heating with flame, it is easy to cause deformation of the inner diameter of the steel pipes at the support position of the steel pipe frame. That is, the final diameter increase effect of the steel pipes is not good. Therefore, a seamless steel pipe hot rolling mill diameter increase and wall reduction device is proposed to solve the above problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a device for increasing diameter and reducing wall thickness in a hot rolling mill for seamless steel pipes. It can use an expansion component in conjunction with an auxiliary drive component that drives the steel pipe to rotate, so that the steel pipe is subjected to more uniform force during the processing, ensuring the uniformity of the steel pipe diameter increase and the effectiveness of the steel pipe diameter increase.

[0006] The technical solution to achieve the purpose of this utility model is: a seamless steel pipe hot rolling mill diameter increasing and wall reduction device, including a support base and a fixed base. An expansion platform and a drive platform are fixedly connected to the upper surface of the support base respectively. Multiple expansion plates are provided on one side of the expansion platform. An expansion component for driving the expansion plates is provided on the drive platform. A fixing component for assisting in fixing the steel pipe is provided on the fixed base. An auxiliary driving component for assisting in rotating the steel pipe is provided inside the fixed base.

[0007] In some embodiments, the expansion plate is slidably connected to the inner wall of the expansion platform, the expansion plate extends toward the fixed base, and a fixed rod is fixedly connected to the rear side of the expansion platform, the fixed rod being fixedly connected to the front side of the drive platform.

[0008] In some embodiments, the expansion assembly includes an expansion screw rotatably connected to the rear side of the expansion stage, and an expansion motor is fixedly connected to the rear side of the drive stage, with the output end of the expansion motor coaxially fixed to the expansion screw.

[0009] In some embodiments, the expansion assembly further includes a drive ring screwed to the surface of the expansion screw, an expansion ring being rotatably connected to the front side of the drive ring, and a plurality of connecting rods being rotatably connected to the surface of the expansion ring, with the end of the connecting rod away from the expansion ring being rotatably connected to the rear end of the expansion plate.

[0010] In some embodiments, the fixing component includes a limiting rod fixedly connected to the inner wall of the fixing base, a support block slidably connected to the surface of the limiting rod, a fixing frame fixedly connected to one side of the support block, a limiting spring fixedly connected to the other side of the support block, and one end of the limiting spring fixedly connected to the inner wall of the fixing base.

[0011] In some embodiments, a movable rod is slidably connected to one side of the fixed frame, and a fixed plate is fixedly connected to one end of the movable rod. The fixed plate is slidably connected to the fixed frame. An avoidance spring is sleeved on the surface of the movable rod. One end of the avoidance spring is fixedly connected to the inner wall of one side of the fixed frame, and the other end of the avoidance spring is fixedly connected to one side of the fixed plate.

[0012] In some embodiments, the auxiliary drive assembly includes a bottom spring fixedly connected to the inner bottom wall of the fixed base, a drive chamber slidably connected to the inner wall of the fixed base, a drive chamber with its lower surface fixedly connected to one end of the bottom spring, a drive motor fixedly connected to one side of the drive chamber, and the output end of the drive motor extending into the drive chamber and fixedly connected to a drive roller.

[0013] Compared with the prior art, the significant advantages of this utility model are:

[0014] This invention, through the inclusion of an expansion assembly and an auxiliary drive assembly, enables the pipe diameter increase process. When the expansion motor is activated, it drives the expansion screw to rotate, causing the drive ring to rotate. This rotation of the drive ring moves the expansion ring along the expansion screw, resulting in the deflection of the connecting rod. The deflection of the connecting rod causes the expansion plate to move closer to the inner wall of the steel pipe or converge towards the pipe's axis. Switching between forward and reverse rotation of the expansion motor allows the expansion plate to repeatedly expand and stretch the inner wall of the steel pipe. Simultaneously, the drive motor is activated, causing the drive roller to rotate. This utilizes friction to rotate the entire steel pipe, further improving the uniformity of the inner diameter expansion and ensuring the effective pipe diameter increase.

[0015] This solves the problem of poor diameter-increasing effect in existing steel pipe diameter-increasing equipment. Attached Figure Description

[0016] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the main structure provided in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the expansion plate structure provided in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the expansion component structure provided in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the fixing component structure provided in one embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the auxiliary drive component structure provided in one embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Support base; 2. Fixed base; 3. Expansion platform; 4. Drive platform; 5. Expansion plate; 6. Expansion assembly; 601. Expansion screw; 602. Expansion motor; 603. Drive ring; 604. Expansion ring; 605. Connecting rod; 7. Fixed assembly; 701. Limiting rod; 702. Support block; 703. Fixing frame; 704. Limiting spring; 705. Movable rod; 706. Fixing plate; 707. Avoidance spring; 8. Auxiliary drive assembly; 801. Bottom spring; 802. Drive chamber; 803. Drive motor; 804. Drive roller; 9. Fixed rod. Detailed Implementation

[0024] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. 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 protection scope of the present invention.

[0025] This utility model provides an improved device for increasing diameter and reducing wall thickness in a hot rolling mill for seamless steel pipes. The technical solution of this utility model is as follows:

[0026] like Figure 1 As shown, the seamless steel pipe hot rolling mill diameter increasing and wall reducing device includes a support base 1 and a fixed base 2. An expansion platform 3 and a drive platform 4 are fixedly connected to the upper surface of the support base 1. Multiple expansion plates 5 are provided on one side of the expansion platform 3. The multiple expansion plates 5 are arranged in a circular pattern and are arc-shaped, which can better fit with the inner wall of the steel pipe. An expansion component 6 for driving the expansion plates 5 is provided on the drive platform 4. A fixing component 7 for assisting in fixing the steel pipe is provided on the fixed base 2. An auxiliary driving component 8 for assisting in rotating the steel pipe is provided inside the fixed base 2.

[0027] It should be noted that, as with the processing methods already disclosed in the prior art, this device can also be used with the aid of external heating equipment, such as a flame, to heat the steel pipe, thereby softening the steel pipe and improving the efficiency of steel pipe processing. Referring to the attached diagram, when using heating equipment such as a flame gun, the heat source can work from above the steel pipe. Due to the setting of the auxiliary drive component 8 in this device, the steel pipe will rotate during processing, which is sufficient to heat up all parts of the steel pipe.

[0028] like Figure 2 and Figure 3 As shown, in one embodiment, the expansion platform 3 is provided with a sliding groove for the expansion plate 5 to slide. The expansion plate 5 is slidably connected to the inner wall of the expansion platform 3. The expansion plate 5 extends toward the fixed base 2. A fixed rod 9 is fixedly connected to the rear side of the expansion platform 3. The fixed rod 9 is fixedly connected to the front side of the drive platform 4.

[0029] In one embodiment, the expansion assembly 6 includes an expansion screw 601 rotatably connected to the rear side of the expansion stage 3. The expansion screw 601 is located at the axial center of the circle formed by the expansion plates 5. An expansion motor 602 is fixedly connected to the rear side of the drive stage 4. The expansion motor 602 is an electrically controllable servo motor used to adjust the direction of rotation and form a reciprocating motion. The output end of the expansion motor 602 is coaxially fixed with the expansion screw 601.

[0030] In one embodiment, the expansion assembly 6 further includes a drive ring 603 screwed to the surface of the expansion screw 601. An expansion ring 604 is rotatably connected to the front side of the drive ring 603. The drive ring 603 and the expansion ring 604 are connected by a circular sliding groove. When the drive ring 603 rotates under the action of the thread and moves along the expansion screw 601, the expansion ring 604 only moves laterally and does not rotate itself. A plurality of connecting rods 605 are rotatably connected to the surface of the expansion ring 604. A connecting groove adapted to the connecting rods 605 is opened at the rear end of the expansion plate 5. The end of the connecting rod 605 away from the expansion ring 604 is rotatably connected to the rear end of the expansion plate 5.

[0031] like Figure 4 As shown, in one embodiment, the fixing component 7 includes a limiting rod 701 fixedly connected to the inner wall of the fixing base 2. A support block 702 is slidably connected to the surface of the limiting rod 701. A fixing frame 703 is fixedly connected to one side of the support block 702, and a limiting spring 704 is fixedly connected to the other side of the support block 702. One end of the limiting spring 704 is fixedly connected to the inner wall of the fixing base 2. When the steel pipe is processed, due to the expansion of the inner diameter, the outer size of the steel pipe will also increase. At the same time, the steel pipe is also rotating. The setting of the limiting spring 704 can provide a certain avoidance ability in the above process, allowing the steel pipe to have enough space to rotate and deform.

[0032] In one embodiment, a movable rod 705 is slidably connected to one side of the fixed frame 703, and a fixed plate 706 is fixedly connected to one end of the movable rod 705. The fixed plate 706 is arc-shaped and slidably connected to the fixed frame 703. An avoidance spring 707 is sleeved on the surface of the movable rod 705. One end of the avoidance spring 707 is fixedly connected to the inner wall of one side of the fixed frame 703, and the other end of the avoidance spring 707 is fixedly connected to one side of the fixed plate 706. The avoidance spring 707 can provide a certain reaction force when clamping the steel pipe, so that the fixed plate 706 can fit against the outer surface of the steel pipe, while leaving space for the deformation of the steel pipe when the inner diameter is expanded.

[0033] like Figure 5 As shown, in one embodiment, the auxiliary driving component 8 includes a bottom spring 801 fixedly connected to the inner bottom wall of the fixed base 2. The bottom spring 801 can extend and retract according to the deformation of the steel pipe, thereby ensuring that the surface of the driving roller 804 can always be in contact with the bottom of the steel pipe, and ensuring that the steel pipe can rotate normally under the action of the driving roller 804. The inner wall of the fixed base 2 is slidably connected to a driving chamber 802. The lower surface of the driving chamber 802 is fixedly connected to one end of the bottom spring 801. A driving motor 803 is fixedly connected to one side of the driving chamber 802. The output end of the driving motor 803 passes through the driving chamber 802 and is fixedly connected to the driving roller 804.

[0034] The specific working method is as follows: When the seamless steel pipe hot rolling mill diameter increasing and wall reducing device is used, the steel pipe to be processed is sleeved around the expansion plate 5, and the outer perimeter of the steel pipe is clamped and stabilized by the fixing frame 703. At the same time, it is ensured that the bottom of the steel pipe can contact the driving roller 804. After the steel pipe is fixed, the expansion motor 602 is started. The expansion motor 602 drives the expansion screw 601 to rotate, which causes the drive ring 603 to rotate. The rotation of the drive ring 603 causes the expansion ring 604 to move along the direction of the expansion screw 601, thereby causing the connecting rod 605 to deflect. The deflection of the connecting rod 605 causes the expansion plate 5 to move closer to the inner wall of the steel pipe or converge towards the axis of the steel pipe. The expansion motor 602 switches between forward and reverse rotation, which can achieve the effect of expanding and stretching the inner wall of the steel pipe by the expansion plate 5 back and forth. At the same time as the above process, the driving motor 803 is started. The driving motor 803 causes the driving roller 804 to rotate, thereby using friction to drive the steel pipe to rotate as a whole, further improving the uniformity of the inner diameter expansion of the steel pipe and ensuring the effect of steel pipe diameter increasing.

[0035] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of equivalent substitutions of the above technical features. Matters not covered in this utility model are common knowledge to those skilled in the art.

Claims

1. A device for increasing diameter and reducing wall thickness in a hot rolling mill for seamless steel pipes, comprising a support base (1) and a fixed base (2), characterized in that: The upper surface of the support base (1) is fixedly connected to an expansion platform (3) and a drive platform (4). Multiple expansion plates (5) are provided on one side of the expansion platform (3). An expansion component (6) for driving the expansion plate (5) is provided on the drive platform (4). A fixing component (7) for assisting in fixing the steel pipe is provided on the fixed base (2). An auxiliary driving component (8) for assisting in rotating the steel pipe is provided inside the fixed base (2).

2. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 1, characterized in that: The expansion plate (5) is slidably connected to the inner wall of the expansion platform (3). The expansion plate (5) extends toward the fixed base (2). A fixed rod (9) is fixedly connected to the rear side of the expansion platform (3). The fixed rod (9) is fixedly connected to the front side of the drive platform (4).

3. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 1, characterized in that: The expansion assembly (6) includes an expansion screw (601) rotatably connected to the rear side of the expansion stage (3), and an expansion motor (602) is fixedly connected to the rear side of the drive stage (4). The output end of the expansion motor (602) is coaxially fixed with the expansion screw (601).

4. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 1, characterized in that: The expansion assembly (6) also includes a drive ring (603) screwed to the surface of the expansion screw (601). An expansion ring (604) is rotatably connected to the front side of the drive ring (603). A plurality of connecting rods (605) are rotatably connected to the surface of the expansion ring (604). The end of the connecting rod (605) away from the expansion ring (604) is rotatably connected to the rear end of the expansion plate (5).

5. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 1, characterized in that: The fixing component (7) includes a limiting rod (701) fixedly connected to the inner wall of the fixing base (2). A support block (702) is slidably connected to the surface of the limiting rod (701). A fixing frame (703) is fixedly connected to one side of the support block (702). A limiting spring (704) is fixedly connected to the other side of the support block (702). One end of the limiting spring (704) is fixedly connected to the inner wall of the fixing base (2).

6. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 5, characterized in that: A movable rod (705) is slidably connected to one side of the fixed frame (703). A fixed plate (706) is fixedly connected to one end of the movable rod (705). The fixed plate (706) is slidably connected to the fixed frame (703). An avoidance spring (707) is sleeved on the surface of the movable rod (705). One end of the avoidance spring (707) is fixedly connected to the inner wall of one side of the fixed frame (703), and the other end of the avoidance spring (707) is fixedly connected to one side of the fixed plate (706).

7. The seamless steel pipe hot rolling mill diameter increasing and wall thickness reducing device according to claim 1, characterized in that: The auxiliary drive assembly (8) includes a bottom spring (801) fixedly connected to the inner bottom wall of the fixed base (2). The inner wall of the fixed base (2) is slidably connected to a drive chamber (802). The lower surface of the drive chamber (802) is fixedly connected to one end of the bottom spring (801). A drive motor (803) is fixedly connected to one side of the drive chamber (802). The output end of the drive motor (803) passes through the drive chamber (802) and is fixedly connected to a drive roller (804).

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