Inclined continuous pipe mill for penetrating seamless steel pipe
By setting up an independently driven skew rolling mill in the continuous rolling mill unit, and using bevel gear pairs to transmit power, the independent speed regulation of the rolls and high torque output are achieved, which solves the problems of spiral phenomenon and uneven wall thickness in steel pipes and improves the rolling quality of steel pipes.
Patent Information
- Application Number
- CN202423066381.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing skew rolling and continuous rolling mills suffer from severe spiraling phenomena inside the steel pipe during the rolling process, resulting in poor uniformity of surface and wall thickness dimensions. In particular, they are unsuitable for rolling conditions requiring high wall thickness precision, especially when rolling pipes with fixed wall thickness.
Two sets of inclined tube rolling mills are set up in the continuous rolling mill unit. Each roll is connected by an independent drive power mechanism and transmission mechanism. Power is transmitted by bevel gear pair to realize independent speed regulation of rolls and high torque output, eliminate the spiral phenomenon in steel tubes and improve the wall uniformity effect.
It achieves uniform wall thickness and surface quality of steel pipes under complex rolling conditions, is suitable for rolling with high wall thickness precision, and significantly improves the dimensional uniformity of steel pipes.
Smart Images
Figure CN223475919U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel pipe production and processing technology, specifically to a skew-connected rolling mill for threading seamless steel pipes. Background Technology
[0002] In seamless steel pipe production, the piercing mill, continuous rolling mill, and sizing (reducing) mill, as the three major units for metal hot deformation, play a crucial role in the dimensional quality of the steel pipe. Currently, there are two types of rolling mills: continuous rolling and skew rolling. One type, the skew continuous rolling mill, uses three rolls to rotate and roll the pierced tube. These three rolls are controlled by three drive motors, resulting in relatively low output torque, severe spiraling within the steel pipe, and poor surface and wall thickness uniformity. In contrast, the continuous rolling mill, because the steel pipe only advances without rotating during the rolling process, does not achieve good wall uniformity, especially when rolling tubes with fixed wall thicknesses. If the tube is rolled directly by the sizing mill without going through the continuous rolling mill, the spiraling phenomenon cannot be eliminated, and the large wall thickness differences become even more pronounced. Therefore, existing skew and continuous rolling mills are not suitable for rolling conditions requiring high wall thickness precision, especially when rolling tubes with fixed wall thicknesses. Utility Model Content
[0003] The purpose of this utility model is to provide a slanted rolling mill for seamless steel pipe threading, which sets up two slanted rolling mills in the continuous rolling mill unit to overcome the problems existing in the existing equipment.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a seamless steel pipe piercing inclined rolling mill for rotary rolling of pierced tubes, comprising a frame, three drive power mechanisms mounted on the frame, three rolls disposed inside the frame, and three transmission mechanisms correspondingly connected between the three rolls and the three drive power mechanisms. The three drive power mechanisms correspond one-to-one with the three transmission mechanisms. Each transmission mechanism includes a first transmission shaft, a first bevel gear, a second bevel gear, and a second transmission shaft. The first transmission shaft is connected and fixed to the rolls, and the first bevel gear is mounted and fixed on the first transmission shaft. The second transmission shaft is connected to the drive power mechanism for transmission, and the second bevel gear is mounted and fixed on the second transmission shaft, with the second bevel gear meshing with the first bevel gear.
[0005] Based on the above technical solution, the present invention can be further improved as follows:
[0006] As a further improvement to the above technical solution, one end of the transmission shaft is connected and fixed to the center of one end of the roll, and the transmission shaft is coaxial with the roll.
[0007] As a further improvement to the above technical solution, the roll is conical, the three rolls are at 120-degree angles to each other, the three rolls are arranged at an inclination and rotate around their respective center lines in the same direction, and the center lines of the three rolls intersect with the rolling center line to form a feed angle.
[0008] As a further improvement to the above technical solution, the frame is provided with supports corresponding to each of the rolls, the supports are provided with scales, the other end of the transmission shaft of the transmission mechanism is connected to a bearing seat, and a pointer is installed on the outer peripheral wall of the bearing seat.
[0009] As a further improvement to the above technical solution, the driving power mechanism consists of a drive motor and a reducer. The roll body is 400mm long, the cone angle of bevel gear one and bevel gear two is set to 10°, and the transmission shaft two is provided with shaft teeth that mesh with the gear teeth on the output shaft of the reducer.
[0010] As a further improvement to the above technical solution, the second bevel gear has the same structure as the first bevel gear. The first bevel gear includes a gear body and bevel gear teeth. The bevel gear teeth are conical and helical along the tooth length direction. The helix angle of the bevel gear teeth is 35°. The normal module of the large end of the bevel gear teeth is 6.5. The gear body is provided with a central through hole. The central through hole is provided with an inner cylindrical surface and an inner spline from the large end to the small end. The small end face of the gear body is provided with a countersunk hole coaxial with the central through hole.
[0011] The beneficial effects of this utility model are as follows: The three rolls of the seamless steel pipe piercing inclined rolling mill of this utility model are each independently connected to the drive power mechanism through the transmission mechanism. The three rolls correspond one-to-one with the three drive power mechanisms. By driving the rolls independently through the three drive power mechanisms, independent speed regulation and constant torque output of the rolls are achieved. Each roll is independently controlled, and the power is transmitted through the bevel gear pair formed by bevel gear two and bevel gear one, realizing a large torque output. This makes the equipment more suitable for complex rolling conditions and the wall uniformity effect is obvious. Attached Figure Description
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 This is a schematic diagram of the structure of the skew-connected tube rolling mill for seamless steel tube threading provided in a preferred embodiment of the present invention;
[0014] Figure 2 yes Figure 1 Schematic diagram of the transmission mechanism and the rolls;
[0015] Figure 3 yes Figure 2 Side view of the central transmission mechanism and the rolls;
[0016] Figure 4 yes Figure 1 A schematic diagram showing the interaction between the central transmission mechanism and the dial.
[0017] Figure 5 This is a schematic diagram of the structure of bevel gear one of the transmission mechanism;
[0018] In the diagram: 1. Roll; 2. Drive mechanism; 3. Transmission mechanism; 31. Drive shaft one; 32. Bevel gear one; 321. Gear body; 322. Bevel gear teeth; 323. Central through hole; 324. Inner cylindrical surface; 325. Internal spline; 326. Countersunk hole; 33. Bevel gear two; 34. Drive shaft two; 341. Shaft teeth; 4. Capillary tube; 5. Frame; 51. Support; 52. Dial; 53. Bearing seat; 531. Pointer. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.
[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0022] like Figure 1 , Figure 2 and Figure 3As shown, a preferred embodiment of this utility model provides a seamless steel pipe piercing inclined continuous rolling mill for rotary rolling of pierced tube 4 in a continuous rolling mill unit. It includes a frame 5, three drive power mechanisms 2 mounted on the frame 5, three rolls 1 disposed inside the frame 5, and three transmission mechanisms 3 correspondingly connected between the three rolls 1 and the three drive power mechanisms 2.
[0023] Each roll 1 is conical, and the three conical rolls 1 are symmetrically arranged at the vertices of an equilateral triangle centered on the rolling centerline. The three conical rolls 1 form an angle of 120 degrees with each other, and the centerlines of the three rolls 1 are at a certain angle to the end face of the stand, so that the rolls 1 can drive the tube 4 to rotate and move forward during the rolling process. The three rolls 1 are arranged at an angle and rotate around their respective centerlines in the same direction. The centerlines of the three rolls 1 intersect with the rolling centerline to form the feed angle.
[0024] Three drive power mechanisms 2 correspond one-to-one with three transmission mechanisms 3. Each transmission mechanism 3 includes a drive shaft 31, a bevel gear 32, a bevel gear 33, and a drive shaft 34. One end of the drive shaft 31 is connected and fixed to the center of one end of the roll 1. The drive shaft 31 is coaxial with the roll 1, and the bevel gear 32 is mounted and fixed on the drive shaft 31. One end of the drive shaft 34 is connected to the drive power mechanism 2. The bevel gear 33 is mounted and fixed on the drive shaft 34. The bevel gear 33 meshes with the bevel gear 32, forming a bevel gear pair. The power output from the drive power mechanism 2 is transmitted to the roll 1 through the bevel gear pair, thereby driving the roll 1 to rotate. In addition, the power transmission through the bevel gear pair formed by the bevel gear 33 and the bevel gear 32 achieves high torque output, meeting the needs of the rolling process.
[0025] Preferably, such as Figure 4 As shown, the frame 5 is equipped with supports 51 corresponding to each of the rolls 1. Each support 51 has a scale 52. The other end of the transmission shaft 31 of the transmission mechanism 3 is connected to a bearing seat 53. A pointer 531 is mounted on the outer peripheral wall of the bearing seat 53. The accuracy of the scale on the scale 52 is 20′. By setting the scale 52 on the support 51 and mounting the pointer 531 on the bearing seat 53, the feed angle of the roll 1 can be accurately read, facilitating the measurement of the feed angle of the roll 1 and enabling precise adjustment of the feed angle, thus stabilizing the rolling process and improving the quality of the steel pipe products.
[0026] Bevel gear 2 33 has the same structure as bevel gear 1 32. The following explanation uses bevel gear 1 32 as an example. Figure 5As shown, bevel gear 32 includes a gear body 321 and bevel gear teeth 322. The bevel gear teeth 322 are conical spirals along the tooth length direction, with a helix angle of 35° and a large-end normal module of 6.5. Bevel gear 33, together with bevel gear 32, adopts a large-helix-angle spiral bevel gear, which effectively reduces the large-end diameter of the gear body 321 and increases the contact length of the tooth surface. While bearing high torque, it reduces the overall size, resulting in a compact structure after assembly, occupying little space, and is suitable for slant-connected tube rolling mills with small dimensions and high rolling forces.
[0027] The gear body 321 has a central through hole 323. Within the central through hole 323, from the large end to the small end, there are sequentially arranged inner cylindrical surfaces 324 and inner splines 325. The small end face of the gear body 321 has a countersunk hole 326 coaxial with the central through hole 323. When assembling the bevel gear 32 and the drive shaft 31, the inner cylindrical surface 324 of the central through hole 323 mates with the drive shaft 31 without any clearance. A positioning sleeve or positioning end cap is installed in the countersunk hole 326, positioning the gear body 321 on both sides of the inner spline 325, ensuring no clearance between the gear body 321 and the drive shaft 31, thus guaranteeing the meshing accuracy between the bevel gear 33 and the bevel gear 32.
[0028] Specifically, the drive power mechanism 2 can be an existing drive motor and reducer, or it can be composed of a permanent magnet synchronous torque motor and a bevel gearbox. In this embodiment, the drive power mechanism 2 is composed of a drive motor and a reducer. The roll body of the roller 1 is 400mm long. The cone angle of the first bevel gear 32 and the second bevel gear 33 can be set to 10°. The second transmission shaft 34 is provided with shaft teeth 341, which mesh with the gear teeth on the output shaft of the reducer.
[0029] In use, this utility model sets up two sets of the above-mentioned inclined tube rolling mills in the continuous rolling mill unit. When each drive power mechanism 2 is working, it transmits power to the transmission shaft 34 of the transmission mechanism 3. The transmission shaft 34 is equipped with a bevel gear 33, and the transmission shaft 31 is equipped with a bevel gear 32. The bevel gear 33 meshes with the bevel gear 32, and the transmission shaft 34 transmits power to the transmission shaft 31 through the bevel gear pair formed by the bevel gear 33 and the bevel gear 32. The transmission shaft 31 drives the roll 1 to rotate. The above-mentioned transmission mechanism 3 adopts a bevel gear transmission method. Through this transmission method, the roll 1 drives the tube 4 to rotate and move forward. The three rolls 1 work together to realize the rotational rolling of the pierced tube 4, effectively eliminating the spiral phenomenon inside the steel tube and achieving a significant uniform wall effect.
[0030] The seamless steel pipe threading inclined rolling mill of this utility model has three rolls 1 that are independently connected to the drive power mechanism 2 through the transmission mechanism 3. The three rolls 1 correspond one-to-one with the three drive power mechanisms 2. The three drive power mechanisms 2 independently drive the rolls 1, realizing independent speed adjustment and constant torque output of the rolls 1. Each roll 1 is independently controlled, and the power is transmitted through the bevel gear pair formed by bevel gear 2 33 and bevel gear 1 32, realizing large torque output, making the equipment more suitable for complex rolling conditions and achieving obvious wall uniformity.
[0031] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.
[0032] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A slanted rolling mill for piercing seamless steel pipes, used for rotary rolling of pierced tubes, characterized in that: The machine includes a frame, three drive power mechanisms mounted on the frame, three rolls located inside the frame, and three transmission mechanisms corresponding to the three rolls and the three drive power mechanisms. The three drive power mechanisms correspond one-to-one with the three transmission mechanisms. Each transmission mechanism includes a first transmission shaft, a first bevel gear, a second bevel gear, and a second transmission shaft. The first transmission shaft is fixedly connected to the rolls and has a first bevel gear mounted on it. The second transmission shaft is connected to the drive power mechanism and has a second bevel gear mounted on it. The second bevel gear meshes with the first bevel gear.
2. The seamless steel pipe piercing oblique rolling mill according to claim 1, characterized in that: One end of the drive shaft is connected and fixed to the center of one end of the roll, and the drive shaft is coaxial with the roll.
3. The seamless steel pipe piercing oblique rolling mill according to claim 2, characterized in that: The rolls are conical, with three rolls at 120-degree angles to each other. The three rolls are arranged at an inclination and rotate around their respective center lines in the same direction. The center lines of the three rolls intersect with the rolling center line to form the feed angle.
4. The seamless steel pipe piercing oblique rolling mill according to claim 3, characterized in that: The frame is provided with supports corresponding to each of the rolls, and the supports are provided with scales. The other end of the transmission shaft of the transmission mechanism is connected to a bearing seat, and a pointer is installed on the outer peripheral wall of the bearing seat.
5. The seamless steel pipe piercing oblique rolling mill according to claim 3, characterized in that: The drive power mechanism consists of a drive motor and a reducer. The roll body is 400mm long. The cone angle of bevel gear one and bevel gear two is set to 10°. The transmission shaft two is provided with shaft teeth, which mesh with the gear teeth on the output shaft of the reducer.
6. The seamless steel pipe piercing oblique rolling mill according to any one of claims 1 to 5, characterized in that: The second bevel gear has the same structure as the first bevel gear. The first bevel gear includes a gear body and bevel gear teeth. The bevel gear teeth are conical and helical along the tooth length direction. The helix angle of the bevel gear teeth is 35°. The normal module of the large end of the bevel gear teeth is 6.
5. The gear body is provided with a central through hole. The central through hole is provided with an inner cylindrical surface and an inner spline from the large end to the small end. The small end face of the gear body is provided with a countersunk hole coaxial with the central through hole.