An on-line multi-speed ratio shifting asynchronous rolling mill

Abstract

The present application belongs to the technical field of rolling equipment, and particularly relates to an online multi-gear-speed-ratio switching asynchronous rolling mill, which comprises a speed reducer, an input coupling, an online gear shifting gearbox, an output coupling and a two-roller rolling mill. The output shaft of the speed reducer is connected with the gear shifting input shaft of the online gear shifting gearbox through the input coupling. The first output shaft and the second output shaft of the online gear shifting gearbox are respectively connected with the upper roller and the lower roller of the two-roller rolling mill through the output coupling. The present application can dynamically adjust the speed ratio of the rolling mill during the rolling process, realize the arbitrary switching of different speed ratios, ensure the continuity of the rolling mill rolling, and greatly improve the production efficiency and working stability.

Description

Technical Field

[0001] This invention belongs to the field of rolling equipment technology, specifically relating to an online multi-speed ratio switching asynchronous rolling mill. Background Technology

[0002] Asynchronous rolling mills employ asynchronous rolling, a method where the upper and lower rolls rotate at different speeds. As a result, the workpiece experiences both vertical rolling force and horizontal shear force, leading to additional shear deformation. This deformation significantly breaks down coarse grains within the material, refining the microstructure and thus improving the material's strength, toughness, and other mechanical properties. Simultaneously, the shear deformation reduces the resistance to plastic deformation, allowing asynchronous rolling mills to require less rolling force than synchronous rolling mills for the same reduction. This not only reduces energy consumption but also lowers the load on the rolling mill equipment, extending its lifespan.

[0003] The speed difference between the upper and lower rolls can be adjusted to more flexibly control the elongation and width of the rolled piece, reducing phenomena such as strip waviness and lateral bending caused by uneven stress distribution during rolling. In the rolling of metal composite strips, setting different rolling speed ratios for metal materials with different elongations can significantly improve the strip's ability to deform together, preventing interface cracking caused by inconsistent deformation. Simultaneously, lower rolling force reduces frictional damage between the rolled piece and the roll surface, contributing to improved surface finish of the rolled sheet.

[0004] Currently, asynchronous rolling mills typically achieve asynchronous rolling by directly connecting two three-phase motors to two rolls via a coupling, and using a PLC to control the speed of the two three-phase motors to achieve the target speed ratio. Alternatively, a multi-speed ratio gear base can be used to switch the speed ratio of the upper and lower rolls. The problems with this approach are as follows:

[0005] 1. According to the mechanical characteristic curve of the motor, the rotational speed changes with the load. During rolling mill operation, there is an inconsistency in the friction between the upper and lower rolls and the upper and lower surfaces of the sheet metal, leading to a difference in the load on the upper and lower rolls, thus changing the rotational speed and making it impossible to complete the entire asynchronous rolling process under a constant speed ratio.

[0006] 2. The current technology for switching the speed ratio of the upper and lower rolls of the rolling mill is based on a multi-speed ratio gear base or gearbox. This means that only a single speed ratio can be achieved during a single mill start-up and shutdown. To achieve speed ratio switching, the mill must be stopped and shifted. It is not possible to switch between different speed ratios arbitrarily during a single rolling process, which results in the rolling mill not being able to work continuously. Furthermore, during the rolling process, the speed ratio cannot be dynamically adjusted online according to the needs of the strip, which greatly reduces production efficiency and operational stability, and is not economical. Summary of the Invention

[0007] This invention provides an online multi-speed ratio switching asynchronous rolling mill to address the above-mentioned problems.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] An online multi-speed ratio switching asynchronous rolling mill includes a geared motor, an input coupling, an online shift gearbox, an output coupling, and a two-roll rolling mill. The output shaft of the geared motor is connected to the shift input shaft of the online shift gearbox through the input coupling. The first output shaft and the second output shaft of the online shift gearbox are respectively connected to the upper roll and the lower roll of the two-roll rolling mill through the output coupling.

[0010] The online gearbox includes a housing. A shift input shaft is rotatably mounted on the left side of the housing. One end of the shift input shaft extends into the housing and is keyed to a drive bevel gear. A vertical shaft is located on the right side of the shift input shaft and is rotatably mounted in the housing. The vertical shaft is connected to different left-side connecting shafts via multiple bevel gear sets. Each bevel gear set includes an intermediate bevel gear mounted on the vertical shaft and a driven bevel gear mounted on the left-side connecting shaft. The intermediate bevel gear meshes with the corresponding driven bevel gear. Different bevel gear sets have different transmission ratios. One of the intermediate bevel gears meshes with a drive bevel gear. The drive bevel gear and multiple intermediate bevel gears have the same module and the same number of teeth. Multiple left-side connecting shafts are rotatably mounted on... On the first support partition, the first support partition is fixedly installed inside the housing. The left connecting shaft is connected to the right connecting shaft via a clutch assembly. The right connecting shaft is rotatably mounted on the second and third support partitions, which are fixedly installed inside the housing. Adjacent right connecting shafts are connected via an intermediate transmission assembly. One of the right connecting shafts is integrally connected to the second output shaft. The first output shaft is rotatably mounted on the first and third support partitions. A first gear is keyed to the left side of the first output shaft. The first gear meshes with a second gear. The second gear is keyed to one of the left connecting shafts. The first gear and the second gear have the same module and the same number of teeth.

[0011] Furthermore, the intermediate transmission assembly includes an intermediate gear, with transmission gears meshing above and below the intermediate gear. The two transmission gears are keyed to two adjacent right-side connecting shafts, and the intermediate gear is keyed to an intermediate shaft. The two ends of the intermediate shaft are rotatably mounted on the second support partition and the third support partition, respectively. The intermediate gear and transmission gear in the same set of intermediate transmission assemblies have the same module and the same number of teeth.

[0012] Furthermore, the center distance between the first output shaft and the second output shaft is the same as the center distance between the upper roll and the lower roll.

[0013] Furthermore, the clutch assembly includes a left-end splined hub keyed to the right end of the left connecting shaft, a right-end splined hub located to the right of the left-end splined hub, a splined sleeve mounted on the right-end splined hub, and a shift fork rotatably connected to the splined sleeve. The shift fork can drive the splined sleeve to move, thereby enabling the engagement or disengagement of the left-end splined hub and the right-end splined hub. A window for the shift fork to slide is provided on the housing, and a hydraulic telescopic cylinder is fixedly mounted on one side of the window. The movable end of the hydraulic telescopic cylinder is vertically fixedly connected to the shift fork, and the right-end splined hub is keyed to the right connecting shaft.

[0014] Furthermore, a limit plate is fixedly installed on the side of the window away from the hydraulic telescopic cylinder to limit the movement of the shift fork.

[0015] Furthermore, the intermediate bevel gear is positioned axially on the vertical shaft via a shoulder or collar, and is fixedly connected to the vertical shaft via a set screw.

[0016] Furthermore, bearings are installed at both the upper and lower ends of the vertical shaft. The bearings are installed in vertical bearing housings, which are fixedly installed inside the housing. The outer ring of the bearing contacts the vertical bearing housing, and the inner ring of the bearing contacts the vertical shaft.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention enables online gear shifting via a clutch assembly, eliminating the need to stop the rolling mill during the shift. Furthermore, it allows for dynamic online adjustment of the mill speed ratio during rolling, enabling arbitrary switching between different speed ratios. This ensures continuous rolling operations and significantly improves production efficiency and operational stability. Moreover, during the rolling of the same strip, the speed ratio can be dynamically adjusted based on the strip's surface characteristics. The stable speed ratio provided by the online gearbox significantly reduces rolling force, improving the smoothness of the rolling process while enhancing strip surface quality and yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the online shift gearbox of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the online shift gearbox of the present invention;

[0022] Figure 4 This is a cross-sectional view of the online shift gearbox of the present invention;

[0023] Figure 5 This is a schematic diagram of the bevel gear set of the present invention;

[0024] Figure 6 This is a schematic diagram of the clutch assembly of the present invention;

[0025] Figure 7 This is a schematic diagram of the intermediate transmission assembly of the present invention;

[0026] Figure 8 This is a state diagram of the online shift gearbox of the present invention when it is in neutral.

[0027] Figure 9 This is a state diagram of the online shift gearbox of the present invention when it is in first gear;

[0028] Figure 10 This is a state diagram of the online shift gearbox of the present invention when it is in second gear;

[0029] Figure 11 This is a state diagram of the online shift gearbox of the present invention when it is in three gears;

[0030] In the diagram, 1 is a geared motor, 2 is an input coupling, 3 is an online shift gearbox, 4 is an output coupling, 5 is a two-roll mill, 301 is a housing, 302 is a shift input shaft, 303 is a drive bevel gear, 304 is a vertical shaft, 305 is a left connecting shaft, 306 is a middle bevel gear, 307 is a driven bevel gear, 308 is a first support partition, 309 is a right connecting shaft, 310 is a second support partition, 311 is a third support partition, 312 is a second output shaft, 313 is a first output shaft, 314 is a first gear, 315 is a second gear, 316 is a middle gear, 317 is a transmission gear, 318 is a middle shaft, 319 is a left splined hub, 320 is a right splined hub, 321 is a spline sleeve, 322 is a shift fork, 323 is a window, 324 is a hydraulic telescopic cylinder, 325 is a limit plate, 326 is a collar, 327 is a set screw, and 328 is a vertical bearing seat. Detailed Implementation

[0031] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0032] like Figures 1 to 11 As shown, an online multi-speed ratio switching asynchronous rolling mill includes a geared motor 1, an input coupling 2, an online shift gearbox 3, an output coupling 4, and a two-roll mill 5. The output shaft of the geared motor 1 is connected to the shift input shaft 302 of the online shift gearbox 3 through the input coupling 2. The first output shaft 313 and the second output shaft 312 of the online shift gearbox 3 are respectively connected to the upper roll and the lower roll of the two-roll mill 5 through the output coupling 4.

[0033] The online gearbox 3 includes a housing 301. A shift input shaft 302 is rotatably mounted on the left side of the housing 301. One end of the shift input shaft 302 extends into the housing 301 and is keyed to a drive bevel gear 303. A vertical shaft 304 is provided on the right side of the shift input shaft 302. Bearings are mounted at both the upper and lower ends of the vertical shaft 304. The bearings are mounted in a vertical bearing housing 328, which is fixedly mounted inside the housing 301. The outer ring of the bearing contacts the vertical bearing housing 328, and the inner ring of the bearing contacts the vertical shaft 304. The vertical shaft 304 passes through multiple... The bevel gear sets are connected to different left-side connecting shafts 305. Each bevel gear set includes an intermediate bevel gear 306 mounted on a vertical shaft 304 and a driven bevel gear 307 mounted on the left-side connecting shaft 305. The intermediate bevel gear 306 is positioned axially on the vertical shaft 304 via a shoulder or collar 326 and is fixedly connected to the vertical shaft 304 via a set screw 327. The intermediate bevel gear 306 meshes with the corresponding driven bevel gear 307. Different bevel gear sets have different transmission ratios. One intermediate bevel gear 306 meshes with a driving bevel gear 303. Wheel 303 has the same module and number of teeth as multiple intermediate bevel gears 306. Multiple left-side connecting shafts 305 are rotatably mounted on a first support partition 308, which is fixedly mounted inside the housing 301. The left-side connecting shafts 305 are connected to right-side connecting shafts 309 via a clutch assembly. The right-side connecting shafts 309 are rotatably mounted on a second support partition 310 and a third support partition 311, which are fixedly mounted inside the housing 301. Adjacent right-side connecting shafts 309 are connected via an intermediate transmission assembly. One of the right-side connecting shafts 309 is integrally connected to the second output shaft 312. The first output shaft 313 is rotatably mounted on the first support partition 308 and the third support partition 311. The left side of the first output shaft 313 is keyed to a first gear 314. The first gear 314 is meshed with a second gear 315. The second gear 315 is keyed to one of the left-side connecting shafts 305. The first gear 314 and the second gear 315 have the same module and the same number of teeth. The center distance between the first output shaft 313 and the second output shaft 312 is the same as the center distance between the upper roll and the lower roll.

[0034] The intermediate transmission assembly includes an intermediate gear 316, with transmission gears 317 meshing above and below the intermediate gear 316. The two transmission gears 317 are keyed to two adjacent right-side connecting shafts 309, respectively. The intermediate gear 316 is keyed to an intermediate shaft 318, and the two ends of the intermediate shaft 318 are rotatably mounted on the second support partition 310 and the third support partition 311, respectively. The intermediate gear 316 and the transmission gears 317 in the same intermediate transmission assembly have the same module and the same number of teeth.

[0035] The clutch assembly includes a left-end splined hub 319 keyed to the right end of the left connecting shaft 305. A right-end splined hub 320 is located to the right of the left-end splined hub 319. A splined sleeve 321 is mounted on the right-end splined hub 320. A shift fork 322 is rotatably connected to the splined sleeve 321. The shift fork 322 can drive the splined sleeve 321 to move, thereby realizing the engagement or disengagement of the left-end splined hub 319 and the right-end splined hub 320. A window 323 is provided on the housing 301 for the shift fork 322 to slide. A hydraulic telescopic cylinder 324 is fixedly installed on one side of the gearbox 322. The movable end of the hydraulic telescopic cylinder 324 is vertically fixedly connected to the shift fork 322. The right end splined hub 320 is keyed to the right side connecting shaft 309. A limit plate 325 is fixedly installed on the side of the window 323 away from the hydraulic telescopic cylinder 324 to limit the shift fork 322. When the online shift gearbox 3 is working, it controls the extension or retraction of multiple hydraulic telescopic cylinders 324 at the same time. The number of hydraulic telescopic cylinders 324 in the extended state does not exceed one, while the remaining hydraulic telescopic cylinders 324 are in the retraction state.

[0036] Regarding the determination of the transmission ratio in this embodiment: In this embodiment, the driving bevel gear 303 and the multiple intermediate bevel gears 306 have the same module and number of teeth, and the driving bevel gear 303 and the multiple driven bevel gears 307 have the same module but different numbers of teeth. According to the formula... By adjusting the number of teeth on the drive bevel gear 303 The number of teeth of the driven bevel gear 307 This allows for a change in the transmission ratio.

[0037] Specifically, the number of teeth of the drive bevel gear 303 and the multiple intermediate bevel gears 306 are 25, and the module is 2. Different sets of bevel gears have different transmission ratios, respectively. There are three gear positions. The driving bevel gear 303 has 25 teeth and a module of 2. The number of teeth on the driven bevel gear 307 varies depending on the gear position. Using the formula, we can calculate that the driven bevel gear 307 has 25 teeth in gear one, 20 teeth in gear two, and 30 teeth in gear three. A detailed table is shown below.

[0038]

[0039] Regarding the determination of the center distances in this embodiment: assuming the center distance between the upper and lower rolls is a1, as follows... Figure 4 As shown, the center distance between the first output shaft 313 and the second output shaft 312 is also a1. The left connecting shaft 305 and the right connecting shaft 309 are coaxial. It is known that the center distance between the uppermost left connecting shaft 305 and the first output shaft 313 is a2. It can be determined that the center distance between the uppermost right connecting shaft 309 and the second output shaft 312 is a3 = a1 - a2. Based on the center distance a3, the number of teeth and module of the transmission gear 317 and the intermediate gear 316 in the upper intermediate transmission assembly can be determined.

[0040] Specifically, we take a1 = 200mm, meaning the center distance between the upper and lower rollers is known to be 200mm. We also take a2 = 80mm as the center distance between the uppermost left connecting shaft 305 and the first output shaft 313. We then take the number of teeth of the first gear 314 and the second gear 315 to be 40, and the module to be 2, to meet the center distance requirement. Further, we find that the center distance between the uppermost right connecting shaft 309 and the second output shaft 312 is a3 = a1 - a2 = 120mm. We then take the number of teeth of the upper intermediate gear 316 and the two transmission gears 317 to be 20, and the module to be 2, to meet the center distance requirement. Ultimately, the center distance between the first output shaft 313 and the second output shaft 312 is the same as the center distance between the upper and lower rollers.

[0041] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An on-line multi-step ratio shifting asynchronous rolling mill characterized by: It includes a speed reducer motor (1), an input coupling (2), an online gear shifting gearbox (3), an output coupling (4) and a two-roller mill (5), the output shaft of the speed reducer motor (1) is connected with the shifting input shaft (302) of the online gear shifting gearbox (3) through the input coupling (2), the first output shaft (313) and the second output shaft (312) of the online gear shifting gearbox (3) are respectively connected with the upper roller and the lower roller of the two-roller mill (5) through the output coupling (4); The online gear shifting gearbox (3) includes a box body (301), a shifting input shaft (302) is rotatably installed on the left side of the box body (301), one end of the shifting input shaft (302) extends into the box body (301) and is key-connected with a driving bevel gear (303), a vertical shaft (304) is arranged on the right side of the shifting input shaft (302), the vertical shaft (304) is rotatably installed in the box body (301), the vertical shaft (304) is drivingly connected with different left connecting shafts (305) through a plurality of bevel gear sets, the bevel gear set includes an intermediate bevel gear (306) installed on the vertical shaft (304) and a driven bevel gear (307) installed on the left connecting shaft (305), the intermediate bevel gear (306) is meshingly connected with the corresponding driven bevel gear (307), different bevel gear sets have different transmission ratios, one of the intermediate bevel gears (306) is meshingly connected with the driving bevel gear (303), the driving bevel gear (303) has the same modulus and the same number of teeth as the plurality of intermediate bevel gears (306), the left connecting shafts (305) are rotatably installed on the first supporting partition plate (308), the first supporting partition plate (308) is fixedly installed in the box body (301), the left connecting shaft (305) is drivingly connected with the right connecting shaft (309) through a clutch assembly, the right connecting shaft (309) is rotatably installed on the second supporting partition plate (310) and the third supporting partition plate (311), the second supporting partition plate (310) and the third supporting partition plate (311) are fixedly installed in the box body (301), adjacent right connecting shafts (309) are drivingly connected through intermediate transmission assemblies, one of the right connecting shafts (309) is integrally connected with the second output shaft (312), the first output shaft (313) is rotatably installed on the first supporting partition plate (308) and the third supporting partition plate (311), the left side of the first output shaft (313) is key-connected with a first gear (314), the first gear (314) is meshingly connected with a second gear (315), the second gear (315) is key-connected on one of the left connecting shafts (305), the first gear (314) and the second gear (315) have the same modulus and the same number of teeth.

2. An on-line multi-step speed ratio shifting asynchronous rolling mill according to claim 1, characterized in that: The intermediate transmission assembly comprises an intermediate gear (316), transmission gears (317) are connected in engagement above and below the intermediate gear (316), the two transmission gears (317) are respectively keyed connected on two adjacent right connecting shafts (309), the intermediate gear (316) is keyed connected on an intermediate shaft (318), two ends of the intermediate shaft (318) are respectively rotatably installed on the second support partition plate (310) and the third support partition plate (311), the modulus and the number of teeth of the intermediate gear (316) and the transmission gears (317) in the same group of intermediate transmission assemblies are the same.

3. An on-line multispeed shifting asynchronous rolling mill according to claim 1, characterized in that: The center distance between the first output shaft (313) and the second output shaft (312) is the same as the center distance between the upper roller and the lower roller.

4. An on-line multispeed shifting asynchronous rolling mill according to claim 1, characterized in that: The clutch assembly comprises a left end spline hub (319) keyed connected on the right side end of the left connecting shaft (305), a right end spline hub (320) is arranged on the right side of the left end spline hub (319), a spline sleeve (321) is installed on the right end spline hub (320), a shift fork (322) is rotatably connected on the spline sleeve (321), the shift fork (322) can drive the spline sleeve (321) to move, thereby realizing the engagement or separation of the left end spline hub (319) and the right end spline hub (320), a window (323) for sliding of the shift fork (322) is formed on the box body (301), a hydraulic telescopic cylinder (324) is fixedly installed on one side of the window (323), the movable end of the hydraulic telescopic cylinder (324) is fixedly connected with the shift fork (322) in perpendicular, and the right end spline hub (320) is keyed connected on the right connecting shaft (309).

5. An on-line multispeed shifting asynchronous rolling mill according to claim 4, characterized in that: A limiting plate (325) is fixedly arranged on the side of the window (323) away from the hydraulic telescopic cylinder (324), so as to limit the shift fork (322).

6. An on-line multispeed shifting asynchronous rolling mill according to claim 1, characterized in that: The intermediate bevel gear (306) is positioned in the axial direction of the vertical shaft (304) through a shaft shoulder or a shaft ring (326), and is fixedly connected with the vertical shaft (304) through a set screw (327).

7. An on-line multispeed shifting asynchronous rolling mill according to claim 1, characterized in that: Bearings are installed on the upper end and the lower end of the vertical shaft (304), the bearings are installed in vertical bearing seats (328), the vertical bearing seats (328) are fixedly installed in the box body (301), the outer rings of the bearings are in contact with the vertical bearing seats (328), and the inner rings of the bearings are in contact with the vertical shaft (304).

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