A shift gear box and asynchronous rolling mill

Abstract

The present invention discloses a shifting gearbox and an asynchronous rolling mill, which relate to the technical field of rolling equipment and include: a box body; a transmission mechanism including a main transmission shaft, a first output shaft and a second output shaft, wherein the main transmission shaft, the first output shaft and the second output shaft can be rotatably installed along their own axes in the box body, and the first output shaft and the second output shaft are driven to rotate by the main transmission shaft, and the first output shaft and the second output shaft rotate in opposite directions; a shifting mechanism including a wheel disc and a plurality of first gear groups, wherein the wheel disc is connected to the main transmission shaft and can rotate around its own axis, and the plurality of first gear groups are arranged on an end face of the wheel disc, and each first gear group is transmission-connected to the main transmission shaft, and different first gear groups are switched to be transmission-connected to the first output shaft by rotating the wheel disc, so that the main transmission shaft is transmission-connected to the first output shaft through one of the plurality of first gear groups, and the transmission ratios between the first gear groups are different, so that there are multiple speed ratios between the first output shaft and the second output shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling equipment, and in particular to a shifting gear box and an asynchronous rolling mill. Background Art

[0002] Currently, during the strip rolling process, rotary shift asynchronous mills use a shift gearbox to distribute the output torque of the reduction motor to the upper and lower rolls, with the upper and lower rolls rotating at different speeds, thereby achieving asynchronous rolling. However, the gear transmission mechanisms within existing shift asynchronous mills are arranged horizontally, requiring a large space to accommodate these transmission mechanisms. This, in turn, results in a large overall size of the mill and a long drive shaft, making overall processing and assembly difficult.

[0003] Therefore, how to improve the compactness of the overall structure of the gear-shift asynchronous rolling mill and reduce the difficulty of processing and assembly is a technical problem that technical personnel in this field currently need to solve. Summary of the Invention

[0004] The object of the present invention is to provide a shift gear box and an asynchronous rolling mill. The shift gear box provided by the present invention is used to improve the compactness of the overall structure of the shift asynchronous rolling mill, thereby reducing the difficulty of processing and assembly.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a shift gearbox, characterized by comprising:

[0007] Box;

[0008] A transmission mechanism includes a main transmission shaft, a first output shaft, and a second output shaft. The main transmission shaft, the first output shaft, and the second output shaft are all rotatably mounted in the housing along their own axes. The first output shaft and the second output shaft are driven to rotate by the main transmission shaft. The first output shaft and the second output shaft rotate in opposite directions.

[0009] The shifting mechanism includes a wheel and multiple groups of first gear sets, the wheel can be connected to the main transmission shaft by rotating around its own axis, the multiple groups of first gear sets are arranged on one end surface of the wheel, each first gear set is connected to the main transmission shaft by transmission, and the different first gear sets are switched by rotating the wheel to be connected to the first output shaft by transmission, so that the main transmission shaft is connected to the first output shaft by transmission through one group of the multiple groups of first gear sets, and the transmission ratio between each group of the first gear sets is different, so that there are multiple speed ratios between the first output shaft and the second output shaft.

[0010] Optionally, in the above-mentioned shift gearbox, the shift mechanism further includes a shift drive motor and a worm, the worm is provided with helical teeth, the circumferential surface of the wheel is provided with worm gear teeth matching the helical teeth, and the shift drive motor drives the wheel to rotate through the worm.

[0011] Optionally, in the above-mentioned shift gearbox, the first gear set includes a first driving gear, an intermediate gear, a first secondary gear, an intermediate transmission shaft and a secondary transmission shaft;

[0012] The intermediate gear is fixedly connected to the intermediate transmission shaft, and the intermediate transmission shaft is rotatably connected to the wheel disc;

[0013] The first secondary gear is fixedly connected to the secondary transmission shaft, and the secondary transmission shaft is rotatably connected to the wheel disc;

[0014] The first driving gear is fixedly connected to the main transmission shaft and is transmission-connected to the first sub-gear via the intermediate gear. The ratio of the number of teeth of the first sub-gear to the intermediate gear in each group of the first gear sets is different.

[0015] Optionally, in the above-mentioned shifting gearbox, the shifting mechanism further comprises a gear hub and an engaging ring gear, and the first gear set further comprises a second sub-gear;

[0016] The second secondary gear is fixedly connected to the secondary transmission shaft;

[0017] The gear hub is fixed to the first output shaft, and the circumferential surface of the gear hub, the circumferential surface of the second sub-gear and the inner wall of the engaging gear ring are all provided with meshing teeth that cooperate with each other. The engaging gear ring is sleeved on the outer side of the gear hub and can move along the axial direction of the gear hub. When the second sub-gear corresponds to the gear hub, the engaging gear ring can move and be sleeved on the outer sides of the second sub-gear and the gear hub at the same time, so that the gear hub is transmission-connected to the second sub-gear through the engaging gear ring, thereby driving the first output shaft to rotate.

[0018] Optionally, in the above-mentioned shifting gearbox, the shifting mechanism further comprises a ball screw assembly, a screw motor, a rod shaft and a shift fork, the ball screw assembly and the screw motor are both arranged on the box body, and the outer wall of the engaging gear ring is provided with an insertion and extraction installation groove surrounding the circumferential surface of the engaging gear ring;

[0019] The screw nut of the ball screw assembly is connected to the shift fork through the rod shaft, the shift fork is installed in the plug-in installation groove, and the shift fork and the plug-in installation groove can slide relative to each other along the circumferential direction of the engaging gear ring;

[0020] The screw of the ball screw assembly extends along the moving direction of the engagement gear ring, and the screw is connected to the screw motor to drive the screw to rotate around its own axis.

[0021] Optionally, in the above-mentioned shifting gearbox, the ball screw assembly also includes two limit baffles both arranged on the box body, the two limit baffles are arranged at a preset distance along the axial direction of the screw, and the screw nut is located between the two limit baffles to limit the displacement of the screw nut.

[0022] Optionally, in the above-mentioned shifting gearbox, the shifting mechanism also includes a spring pin assembly, the wheel is provided with a pin hole, the spring pin assembly includes a spring and a lock pin, the spring is arranged on the box body, the lock pin is connected to the spring, and the lock pin can be plugged into and matched with the pin hole to limit the rotation of the wheel.

[0023] Optionally, in the above-mentioned shifting gearbox, the transmission mechanism further includes a second driving gear and a driven gear meshing with the second driving gear, the second driving gear is fixedly connected to the main transmission shaft, the driven gear is fixedly connected to the second output shaft, and the main transmission shaft drives the second output shaft to rotate through the second driving gear and the driven gear.

[0024] In the shifting gearbox provided by the present invention, a transmission mechanism drives a first output shaft and a second output shaft to rotate and output torque through a main transmission shaft, and the first output shaft and the second output shaft have different rotational directions. In the shifting mechanism, multiple sets of first gear sets are arranged on a wheel disk, and each of the first gear sets is connected to the main transmission shaft. The wheel disk is rotated to switch between different first gear sets for transmission connection with the first output shaft, so that the main transmission shaft can be connected to the first output shaft through one of the multiple sets of first gear sets, and the first gear sets have different transmission ratios. Ultimately, the first output shaft and the second output shaft can be switched between multiple speed ratios to meet the requirements of different operating conditions of the asynchronous rolling mill. Compared with the prior art, the shifting gearbox provided by the present invention not only can achieve different adjustment of the relative speed ratio of the upper and lower rollers in the asynchronous rolling mill, but also the multiple sets of first gear sets that achieve different speed ratio switching are all arranged centrally on the end surface of the wheel disk, making the overall structure more integrated and occupying less space, significantly reducing the volume of the shifting gearbox, and the entire transmission mechanism is smaller in size, thereby reducing the overall processing and assembly requirements and difficulty.

[0025] In a second aspect, the present invention also provides an asynchronous rolling mill, comprising a two-roll rolling mill section and a shift gear box, the two-roll rolling mill section comprising an upper roll and a lower roll, the upper roll being transmission-connected to the first output shaft of the shift gear box, the lower roll being transmission-connected to the second output shaft of the shift gear box, and the shift gear box being a shift gear box as described in any one of the above items.

[0026] Optionally, in the above-mentioned asynchronous rolling mill, the asynchronous rolling mill also includes a cross-shaft head coupling and a vibration-absorbing shaft head, the first output shaft is connected to the upper roller through the cross-shaft head coupling and the vibration-absorbing shaft head, and / or the second output shaft is connected to the lower roller through the cross-shaft head coupling and the vibration-absorbing shaft head.

[0027] The asynchronous rolling mill provided by the present invention has all the technical effects of the above-mentioned shifting gearbox because it has the above-mentioned shifting gearbox, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of a shift mechanism disclosed in an embodiment of the present invention;

[0030] Figure 2 A schematic structural diagram of a transmission mechanism disclosed in an embodiment of the present invention;

[0031] Figure 3 This is a schematic structural diagram of the engagement ring gear disclosed in an embodiment of the present invention, in which the engagement ring gear is simultaneously sleeved on the outer sides of the gear hub and the second sub-gear;

[0032] Figure 4 A schematic diagram of the rotation direction of the shaft and gear disclosed in an embodiment of the present invention;

[0033] Figure 5 This is a schematic structural diagram of a worm gear shifting method disclosed in an embodiment of the present invention;

[0034] Figure 6 A schematic structural diagram of a lock pin disclosed in an embodiment of the present invention;

[0035] Figure 7 A schematic structural diagram of a vibration-absorbing shaft head disclosed in an embodiment of the present invention;

[0036] Figure 8 A schematic structural diagram of an asynchronous rolling mill disclosed in an embodiment of the present invention;

[0037] Figure 9 This is a schematic structural diagram of a box disclosed in an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of speed fluctuations before and after the installation of the vibration-absorbing shaft head disclosed in an embodiment of the present invention.

[0039] Reference numerals:

[0040] 01 is the box, 02 is the main transmission shaft, 03 is the first output shaft, 04 is the second output shaft, 05 is the wheel, 06 is the shift drive motor, 07 is the worm, 08 is the first driving gear, 09 is the intermediate gear, 10 is the first sub-gear, 11 is the intermediate transmission shaft, 12 is the sub-transmission shaft, 13 is the gear hub, 14 is the engagement ring gear, 15 is the second sub-gear, 16 is the screw motor, 17 is the rod shaft, 18 is the shift fork, 19 is the plug-in installation Groove, 20 is the screw nut, 21 is the screw, 22 is the limit baffle, 23 is the end cover, 24 is the spring, 25 is the lock pin, 26 is the second driving gear, 27 is the driven gear, 28 is the two-roll mill part, 29 is the upper roller, 30 is the lower roller, 31 is the cross shaft head coupling, 32 is the vibration absorbing shaft head, 32-1 is the shock absorbing spring, 32-2 is the shaft ring, 32-3 is the shaft head, 33 is the bracket, 34 is the reduction motor, and 35 is the oil drain valve. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0044] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and may encompass internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a shifting gearbox comprising a housing 01, a transmission mechanism, and a shifting mechanism. Housing 01 is a cavity structure having an accommodation chamber, and the transmission mechanism comprises a main transmission shaft 02, and a first output shaft 03 and a second output shaft 04 for connecting to two rollers, respectively. Main transmission shaft 02, first output shaft 03, and second output shaft 04 are all rotatably mounted within the accommodation chamber of housing 01 along their respective axes. A reduction motor 34 drives main transmission shaft 02 to rotate, which in turn drives first output shaft 03 and second output shaft 04 to rotate. Ultimately, first output shaft 03 and second output shaft 04 output torque, with the first output shaft 03 and second output shaft 04 rotating in opposite directions. The shifting mechanism includes a wheel disc 05 and multiple groups of first gear groups. The wheel disc 05 is installed on the main transmission shaft 02, and the wheel disc 05 can rotate around its own axis. The wheel disc 05 can rotate relative to the main transmission shaft 02, and the multiple groups of first gear groups are arranged on one end face of the wheel disc 05. The first gear group on the wheel disc 05 is connected to the main transmission shaft 02, so that different first gear groups can be switched to be connected to the first output shaft 03 through the rotation of the wheel disc 05, and then the main transmission shaft 02 is connected to the first output shaft 03 through one group of the multiple groups of first gear groups. Moreover, because the transmission ratios between the groups of first gear groups are different, the first output shaft 03 can output different speeds, and finally there are multiple speed ratios between the first output shaft and the second output shaft, realizing different speed ratios of the upper and lower rollers in the asynchronous rolling mill, meeting various rolling work requirements. The shift gearbox provided in this embodiment can not only realize different adjustments to the relative speed ratios of the upper and lower rollers in the asynchronous rolling mill, but also realize that multiple sets of first gear sets with different speed ratios are all centrally arranged on the end face of the wheel disc, so that the entire structure has a high degree of integration and occupies a small space, which significantly reduces the size of the shift gearbox, and the entire transmission mechanism is smaller in size, thereby reducing the overall processing and assembly requirements and difficulty.

[0047] like Figure 1 and Figure 5As shown, in some embodiments, the shift mechanism also includes a shift drive motor 06 and a worm 07, the worm 07 is provided with helical teeth, and the circumferential surface of the wheel 05 is provided with worm gear teeth matching the helical teeth, and the worm 07 and the wheel 05 are connected by meshing the worm gear teeth and the helical teeth. The shift drive motor 06 is connected to the worm 07, so that the shift drive motor 06 drives the worm 07 to rotate, thereby driving the wheel 05 to rotate around its own axis, and adjusting the position of each first gear group of the wheel 05, so that the main transmission shaft 02 can drive the rotation of the first output shaft 03 through the first gear groups with different transmission ratios. The worm and worm gear method not only has a compact overall structure and smooth transmission, but also has good self-locking performance, ensuring smooth switching of gears at different speeds and improving switching reliability. The motor drive improves the automation capability of the overall equipment, reduces the workload of the staff, and improves the speed and convenience of the gear switching work. Additionally, an oil tank and drain valve 35 are located at the bottom of housing 01. Lubricating oil is added to the tank, submerging one-third of the worm gear. This lubricates the meshing transmission between the worm and worm wheel. This lubrication improves shifting smoothness, reduces wear on the rotating gear plate, and prolongs its service life. Drain valve 35 is used to remove used lubricant during maintenance. Alternatively, a gear can be installed to replace worm 07. This gear meshes with wheel 05, and the shift drive motor 06 drives the gear to rotate wheel 05, similarly achieving gear ratio switching.

[0048] like Figure 1 and Figure 4 As shown, in some embodiments, the first gear set includes a first driving gear 08, an intermediate gear 09, a first sub-gear 10, an intermediate transmission shaft 11 and a sub-transmission shaft 12, wherein the intermediate gear 09 is connected to the wheel disc 05 through the intermediate transmission shaft 11, the intermediate gear 09 is fixedly connected to the intermediate transmission shaft 11, and the intermediate gear 09 and the intermediate transmission shaft 11 rotate synchronously around the axis of the intermediate transmission shaft 11, and the first sub-gear 10 is connected to the wheel disc 05 through the sub-transmission shaft 12, and similarly the first sub-gear 10 and the sub-transmission shaft 12 are fixed and rotate synchronously around the axis of the sub-transmission shaft 12. The first driving gear 08 is fixed to the main transmission shaft 02, and the first driving gear 08 rotates synchronously with the main transmission shaft 02. At the same time, the first driving gear 08 is meshed with the intermediate gear 09, and the intermediate gear 09 is meshed with the first sub-gear 10. Then, the first driving gear 08 can drive the first sub-gear 10 to rotate through the intermediate gear 09. The ratio of the number of teeth of the intermediate gear 09 to the first sub-gear 10 in each first gear set is different, so that each first gear set has a different transmission ratio, thereby realizing different speed output of the first output shaft 03.

[0049] In a specific embodiment, the center distance between the main transmission shaft 02 and the auxiliary transmission shaft 12 is set to 120mm, and the multi-speed ratios that can be achieved are i=1, i=0.75, and i=0.5, that is, the first gear set is provided with three groups. At this time, the number of the first driving gear 08Z1 is 40 and the module is 2. Under the premise of meeting the center distance and module of the meshing gears, the gear ratios can be adjusted according to the following formula: The number of teeth Z2 of the intermediate gear 09 in each first gear set and the number of teeth Z3 of the first sub-gear 10 are calculated, as shown in Table 1:

[0050] Table 1 Transmission gear parameters

[0051]

[0052] like Figure 2 and Figure 3 As shown, in some embodiments, the shift mechanism further includes a gear hub 13 and an engaging gear ring 14, the first gear set further includes a second sub-gear 15, the circumferential surface of the gear hub 13, the circumferential surface of the second sub-gear 15, and the inner wall of the engaging gear ring 14 are provided with mutually matching meshing teeth. In a specific embodiment, the number of teeth of the second sub-gear 15, the engaging gear ring 14 and the gear hub 13 are all set to 35, and the module is 2. The second sub-gear 15 is fixedly connected to the sub-transmission shaft 12, and the second sub-gear 15 can rotate synchronously with the sub-transmission shaft 12. The gear hub 13 is fixed on the first output shaft 03, and the engaging ring gear 14 is sleeved on the outside of the gear hub 13 and can move along the axial direction of the gear hub 13. When the wheel 05 rotates to drive the first gear set to rotate, so that the second sub-gear 15 corresponds to the gear hub 13, that is, when the circumferential surface of the second sub-gear 15 is aligned with the circumferential surface of the gear hub 13, the engaging ring gear 14 can move toward the second sub-gear 15 until the engaging ring gear 14 is sleeved on the outside of the second sub-gear 15 and the gear hub 13 at the same time. At this time, the engaging ring gear 14 is simultaneously engaged with the second sub-gear 15 and the gear hub 13 through meshing teeth. The second sub-gear 15 is meshed, so the second sub-gear 15 can rotate synchronously with the gear hub 13 through the engagement ring gear 14. Therefore, the main transmission shaft 02 drives the sub-transmission shaft 12 to rotate through the first driving gear 08, the intermediate gear 09 and the first sub-gear 10, and the second sub-gear 15 rotating synchronously with the sub-transmission shaft 12 makes the gear hub 13 rotate synchronously through the engagement ring gear 14, thereby driving the first output shaft 03 fixed to the gear hub 13 to rotate, thereby realizing the main transmission shaft 02 driving the first output shaft 03 to rotate through the first gear set, and when switching the first gear set with different gear ratios to adjust the output speed of the first output shaft 03, and when no gear shift is performed, the engagement ring gear 14 is only sleeved on the outside of the gear hub 13.

[0053] like Figure 1 、 Figure 2 and Figure 4As shown, in some embodiments, the shift mechanism also includes a ball screw assembly, a screw motor 16, a rod shaft 17 and a shift fork 18, and a plug-in installation groove 19 is opened on the outer wall of the engaging gear ring 14. The plug-in installation groove 19 surrounds the outer circumferential surface of the engaging gear ring 14, and the center of the annular plug-in installation groove 19 is located on the axis of the engaging gear ring 14. The screw nut 20 of the ball screw assembly is connected to the fork 18 through the rod shaft 17. The fork 18 is installed in the plug-in installation groove 19. The fork 18 and the plug-in installation groove 19 are clearance-matched, so that the fork 18 can slide relatively in the plug-in installation groove 19 along the circumferential direction of the engaging gear ring 14 during the rotation of the engaging gear ring 14 without affecting the rotation of the engaging gear ring 14. The screw 21 in the ball screw assembly extends along the moving direction of the engaging gear ring 14. The screw 21 is connected to the screw motor 16 and drives the screw 21 to rotate around its own axis through the screw motor 16. Therefore, the second sub-gear 15 in the first gear group is switched to the gear that is connected to the second sub-gear 15 by rotating the wheel 05. When the hub 13 corresponds, the screw motor 16 starts to drive the screw 21 to rotate, and the screw nut 20 on the screw 21 moves along the axis of the screw 21. The shift fork 18 connected to the screw nut 20 through the rod shaft 17 pushes the movement of the coupling gear ring 14 through the plug-in installation slot 19, so that the coupling gear ring 14 can move toward the second sub-gear 15 to be simultaneously mounted on the outside of the second sub-gear 15 and the gear hub 13, or move away from the second sub-gear 15 to release the synchronous rotation of the second sub-gear 15 and the gear hub 13. The screw motor 16 and the ball screw assembly further improve the automatic performance of the equipment, making the speed adjustment and shifting process more accurate and quick. Alternatively, the coupling gear ring 14 is provided with a shift lever, and the staff manually pushes the coupling gear ring 14 through the shift lever to achieve the connection between the second sub-gear 15, the gear hub 13 and the coupling gear ring 14.

[0054] Furthermore, the ball screw assembly is also provided with two limit baffles 22, which are arranged at preset distances along the axial direction of the screw 21, and the screw nut 20 is located between the two limit baffles 22. The limit baffles 22 are used to limit the displacement distance of the screw nut 20, ensuring that the screw nut 20 moves within the preset distance, so that the coupling gear ring 14 moves within the preset distance along the axial direction of the gear hub 13, avoiding the occurrence of the problem that the second sub-gear 15 and the outer side of the gear hub 13 cannot be simultaneously sleeved during the movement process of the coupling gear ring 14, thereby improving the reliability of the synchronous rotation connection between the second sub-gear 15 and the gear hub 13 through the coupling gear ring 14.

[0055] like Figure 7 and 9As shown, in some embodiments, the shift mechanism is further provided with a spring pin assembly, and the wheel disc is provided with a pin hole. The spring pin assembly includes an end cover 23, a spring 24 and a lock pin 25. The end cover 23 is fixed to the shell of the box body 01, and the lock pin 25 is connected to the end cover 23 through the spring 24. When the wheel disc 05 rotates to switch each first gear group, when the second sub-gear 15 rotates with the wheel disc 05 and corresponds to the gear hub 13, the lock pin 25 is pushed by the elastic force of the spring 24, so that one end of the lock pin 25 extends into the pin hole, so that the wheel disc 05 is locked and limited by the cooperation of the lock pin 25 and the pin hole, thereby ensuring the accuracy of the cooperation between the second sub-gear 15 and the gear hub 13, and the engagement ring gear 14 slides smoothly between the second sub-gear 15 and the gear hub 13, so that the first output shaft 03 rotates stably, thereby improving the stability and reliability of the gear shifting process.

[0056] In one specific embodiment, the end of the locking pin 25 that extends into the pin hole is trimmed, resulting in a beveled end surface. This allows the wheel 05 to rotate in the direction of the bevel but not in the direction opposite the bevel, achieving one-way rotation with reverse locking. Furthermore, multiple spring pin assemblies and pin holes can be provided, with the number of spring pin assemblies and pin holes being equal. The coordination of multiple sets of spring pin assemblies and pin holes further enhances the locking and positioning capabilities of the wheel 05, further ensuring the stability and reliability of the shifting process.

[0057] like Figure 4 As shown, the transmission mechanism also includes a second driving gear 26 and a driven gear 27. The second driving gear 26 is fixed on the main transmission shaft 02 and rotates synchronously with the main transmission shaft 02. The driven gear 27 is fixed on the second output shaft 04. The second driving gear 26 is meshed with the driven gear 27. The second driving gear 26 and the driven gear 27 are both reverse gears. In this way, the main transmission shaft 02 drives the second output shaft 04 to rotate through the second driving gear 26 and the driven gear 27, and the second driving gear 26 and the driven gear 27 are both reverse gears. In this embodiment, the number of teeth of both the second driving gear 26 and the driven gear 27 can be set to 40. The second output shaft 04 has the same speed as the main transmission shaft 02, and the second output shaft 04 rotates in the opposite direction to the first output shaft 03.

[0058] like Figure 8As shown, an embodiment of the present invention further discloses an asynchronous rolling mill, comprising a two-roll mill section 28 and a shift gearbox as described in any of the above embodiments. The two-roll mill section 28 includes an upper roll 29 and a lower roll 30, both of which are mounted on the two-roll mill section 28 so as to rotate about their respective axes. The upper roll 29 is in transmission connection with the first output shaft 03 of the shift gearbox, while the lower roll 30 is in transmission connection with the second output shaft of the shift gearbox. Therefore, the shift gearbox can be used to adjust the upper roll 29 and the lower roll 30 to have different speed ratios for rolling steel. Since the asynchronous rolling mill includes the above-mentioned shift gearbox, it has all the technical effects of the above-mentioned shift gearbox, which will not be described in detail herein.

[0059] like Figure 8 and Figure 10 As shown, the asynchronous rolling mill provided in this embodiment also includes a cross-shaft coupling 31 and a vibration absorbing shaft head 32. The first output shaft 03 is connected to the cross-shaft coupling 31, and the cross-shaft coupling 31 is connected to the upper rolling roller 29 through the vibration absorbing shaft head 32. The vibration absorbing shaft head 32 includes a shock-absorbing spring 32-1, a shaft ring 32-2 and a shaft head 32-3, wherein a plurality of shock-absorbing springs 32-1 are provided, and each shock-absorbing spring 32-1 is evenly distributed on the same circumference with the shaft ring 32-2 as the center. One end of the shock-absorbing spring 32-1 abuts against the shaft head 32-3, and the other end abuts against the shaft ring 32-2. In this way, the shock-absorbing spring 32-1 absorbs vibration and effectively reduces the impact of the cross-shaft coupling 31 on the rolling roller speed, which can reduce the fluctuation of the speed and improve the stability of the speed. The vibration absorbing shaft head 32 is connected to a bracket 33, which balances the radial force of the rolling roller through the bracket 33, and transmits part of the vibration to the ground, effectively improving the rolling stability. Similarly, the second output shaft 04 can also be connected to the lower roller 30 through the cross shaft coupling 31 and the vibration absorbing shaft head 32. The above effects will not be repeated.

[0060] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A shift gear box, characterized in that: include: Box; A transmission mechanism includes a main transmission shaft, a first output shaft, and a second output shaft. The main transmission shaft, the first output shaft, and the second output shaft are all rotatably mounted in the housing along their own axes. The first output shaft and the second output shaft are driven to rotate by the main transmission shaft. The first output shaft and the second output shaft rotate in opposite directions. The shifting mechanism includes a wheel and multiple groups of first gear sets, the wheel can be connected to the main transmission shaft by rotating around its own axis, the multiple groups of first gear sets are arranged on one end surface of the wheel, each first gear set is connected to the main transmission shaft by transmission, and the different first gear sets are switched by rotating the wheel to be connected to the first output shaft by transmission, so that the main transmission shaft is connected to the first output shaft by transmission through one group of the multiple groups of first gear sets, and the transmission ratio between each group of the first gear sets is different, so that there are multiple speed ratios between the first output shaft and the second output shaft.

2. The shift gear box according to claim 1, characterized in that: The shift mechanism further includes a shift drive motor and a worm, wherein the worm is provided with helical teeth, and the circumferential surface of the wheel is provided with worm gear teeth matching the helical teeth, and the shift drive motor drives the wheel to rotate through the worm.

3. The shift gear box according to claim 1, characterized in that: The first gear set includes a first driving gear, an intermediate gear, a first secondary gear, an intermediate transmission shaft and a secondary transmission shaft; The intermediate gear is fixedly connected to the intermediate transmission shaft, and the intermediate transmission shaft is rotatably connected to the wheel disc; The first secondary gear is fixedly connected to the secondary transmission shaft, and the secondary transmission shaft is rotatably connected to the wheel disc; The first driving gear is fixedly connected to the main transmission shaft and is transmission-connected to the first sub-gear via the intermediate gear. The ratio of the number of teeth of the first sub-gear to the intermediate gear in each group of the first gear sets is different.

4. The shift gear box according to claim 3, characterized in that: The shift mechanism further includes a gear hub and an engaging ring gear, and the first gear set further includes a second sub-gear; The second secondary gear is fixedly connected to the secondary transmission shaft; The gear hub is fixed to the first output shaft, and the circumferential surface of the gear hub, the circumferential surface of the second sub-gear and the inner wall of the engaging gear ring are all provided with meshing teeth that cooperate with each other. The engaging gear ring is sleeved on the outer side of the gear hub and can move along the axial direction of the gear hub. When the second sub-gear corresponds to the gear hub, the engaging gear ring can move and be sleeved on the outer sides of the second sub-gear and the gear hub at the same time, so that the gear hub is transmission-connected to the second sub-gear through the engaging gear ring, thereby driving the first output shaft to rotate.

5. The shift gear box according to claim 4, characterized in that: The shift mechanism further includes a ball screw assembly, a screw motor, a rod shaft and a shift fork, wherein the ball screw assembly and the screw motor are both arranged on the box body, and an outer wall of the engaging gear ring is provided with an insertion and extraction installation groove surrounding the circumferential surface of the engaging gear ring; The screw nut of the ball screw assembly is connected to the shift fork through the rod shaft, the shift fork is installed in the plug-in installation groove, and the shift fork and the plug-in installation groove can slide relative to each other along the circumferential direction of the engaging gear ring; The screw of the ball screw assembly extends along the moving direction of the engagement gear ring, and the screw is connected to the screw motor to drive the screw to rotate around its own axis.

6. The shift gear box according to claim 5, characterized in that: The ball screw assembly also includes two limit baffles arranged on the box body, the two limit baffles are arranged at a preset distance along the axial direction of the screw, and the screw nut is located between the two limit baffles to limit the displacement of the screw nut.

7. The shift gear box according to claim 1, characterized in that: The shift mechanism also includes a spring pin assembly, the wheel disc is provided with a pin hole, the spring pin assembly includes a spring and a lock pin, the spring is arranged on the box body, the lock pin is connected to the spring, and the lock pin can be plugged into and matched with the pin hole to limit the rotation of the wheel disc.

8. The shift gear box according to claim 1, characterized in that: The transmission mechanism also includes a second driving gear and a driven gear meshing with the second driving gear, the second driving gear is fixedly connected to the main transmission shaft, the driven gear is fixedly connected to the second output shaft, and the main transmission shaft drives the second output shaft to rotate through the second driving gear and the driven gear.

9. An asynchronous rolling mill, characterized in that: It includes a two-roll mill section and a shift gear box, the two-roll mill section includes an upper roll and a lower roll, the upper roll is transmission-connected to the first output shaft of the shift gear box, the lower roll is transmission-connected to the second output shaft of the shift gear box, and the shift gear box is the shift gear box as described in any one of claims 1-8.

10. The asynchronous rolling mill according to claim 9, characterized in that The asynchronous rolling mill also includes a cross-shaft coupling and a vibration-absorbing shaft head, the first output shaft is connected to the upper roll through the cross-shaft coupling and the vibration-absorbing shaft head, and / or the second output shaft is connected to the lower roll through the cross-shaft coupling and the vibration-absorbing shaft head.

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