Tension roller device convenient to maintain and furnace coil production line

Abstract

The utility model relates to a tension roller device convenient to maintain, which comprises a tension roller, a first driving mechanism for driving the tension roller to rotate, and a second driving mechanism for driving the tension roller to move between a working position and a maintenance position, the second driving mechanism comprises a rocker arm and a rocker arm driving unit used for driving the rocker arm to swing around a swing axis, the tension roller is installed on the rocker arm, and the swing axis is parallel to the axis of the tension roller and is spaced from the axis of the tension roller. In addition, the utility model further relates to a furnace coil production line adopting the tension roller device. According to the utility model, the tension roller is driven by the second driving mechanism to move between the working position and the maintenance position, so that the hoisting frequency of the tension roller can be reduced, the online maintenance is realized, the maintenance environment of the tension roller can be improved, and the convenience and safety of the maintenance of the tension roller are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of steel rolling technology, specifically relating to a tension roller device that is easy to maintain and a hot roll production line using the tension roller device. Background Technology

[0002] Hot-rolled strip production lines have a wide range of applications in the industry due to their advantages such as short process, simplified technology, fewer equipment, low investment, wide range of products that can be produced, flexible production, and high product precision. They are a classic technology for rolling strip steel, especially for rolling stainless steel, which is highly sensitive to temperature. However, their output is far lower than that of conventional hot continuous rolling, making it difficult to meet the requirements of large capacity and high output. Therefore, they are currently only used in the field of stainless steel production.

[0003] Currently, a tension roller is installed between the coiling furnace and the pinch rolls to adjust the tension of the strip during coiling. Because this tension roller is mounted on the pinch roll base, it is positioned near the inlet and outlet of the coiling furnace. During operation and standby, the tension roller is constantly exposed to the high temperatures (around 1000℃) inside the coiling furnace. This is particularly problematic for medium-thick plate production lines that can perform both coiling and flat rolling. When the tension roller is in standby mode, prolonged exposure to this heat can lead to multiple life-span bottlenecks, including bearing burnout, seal failure, roller surface failure, bearing housing deformation, and roller deformation, resulting in relatively high maintenance frequency. Existing tension rollers have a fixed-position structure. When maintenance is required, the tension roller is typically lifted from its installation location for offline maintenance, which is time-consuming. Furthermore, the disassembly and assembly of the tension roller involves high-temperature environments, requiring significant operational effort and posing low safety risks. Utility Model Content

[0004] This utility model relates to a tension roller device that is easy to maintain and a furnace coil production line using the tension roller device, which can at least solve some of the defects of the prior art.

[0005] This utility model relates to a tension roller device that is easy to maintain, including a tension roller and a first drive mechanism for driving the tension roller to rotate, and a second drive mechanism for driving the tension roller to move between a working position and a maintenance position. The second drive mechanism includes a rocker arm and a rocker arm drive unit for driving the rocker arm to swing about a swing axis. The tension roller is mounted on the rocker arm, and the swing axis is parallel to and has a gap with the axis of the tension roller.

[0006] As one embodiment, the tension roller device also includes a locking mechanism for locking the rocker arm in the maintenance position.

[0007] As one embodiment, the locking mechanism includes a pin cylinder and a safety pin, wherein the safety pin is disposed at the output end of the pin cylinder and a corresponding pin hole is provided on the rocker arm.

[0008] As one embodiment, the rocker arm is connected to the rocker arm drive unit via a rocker arm drive rod; the rocker arm drive rod is designed as a flange structure, and the pin hole is provided on its flange portion.

[0009] As one embodiment, the rocker arm includes two arms arranged in parallel and spaced apart, and the two side roller shafts of the tension roller are respectively rotatably mounted on the two arms.

[0010] As one implementation method, the two booms are connected in series via a rocker arm connecting beam.

[0011] As one implementation method, the rocker arm connecting beam is provided with a rocker arm cooling structure.

[0012] As one embodiment, the rocker arm cooling structure includes a water-cooled cavity formed in the rocker arm connecting beam, and a cooling core tube is provided in the water-cooled cavity, with the outlet end of the cooling core tube communicating with the water-cooled cavity.

[0013] As one implementation method, the cooling core tube adopts a multi-segment series structure, and the core tube segments are connected by flexible connectors.

[0014] This utility model also provides a coil production line, including a coiling furnace, an inlet pinch roll and an outlet pinch roll, and a tension roll device is arranged between the coiling furnace and the inlet pinch roll and / or between the coiling furnace and the outlet pinch roll, and at least one set of tension roll devices adopts the tension roll device as described above.

[0015] This utility model has at least the following beneficial effects:

[0016] In this invention, the tension roller is driven to move between the working position and the maintenance position by the second driving mechanism. This not only reduces the frequency of tension roller hoisting and enables online maintenance, but also improves the tension roller maintenance environment, greatly enhancing the convenience and safety of tension roller maintenance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the tension roller assembly;

[0019] Figure 2 This is an isometric view of the tension roller assembly;

[0020] Figure 3This is a left view of the tension roller assembly;

[0021] Figure 4 for Figure 1 Partial sectional view of AA;

[0022] Figure 5 for Figure 1 Partial sectional view of BB in the middle;

[0023] Figure 6 for Figure 5 A schematic diagram of a local structure in the image;

[0024] Figure 7 for Figure 1 A partial sectional view of the CC section. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1

[0027] like Figures 1-4 This utility model provides a tension roller device, including a tension roller 1 and a first driving mechanism. The first driving mechanism is configured to enable the tension roller 1 to have an active rotation mode and a passive rotation mode: in the active rotation mode, the first driving mechanism drives the tension roller 1 to rotate actively; in the passive rotation mode, the tension roller 1 is configured as a passive tension roller, that is, the first driving mechanism does not output force to the tension roller 1.

[0028] The aforementioned tension roller device can be applied to a hot roll production line, for example, arranged between the coiling furnace and the inlet pinch roller, and / or between the coiling furnace and the outlet pinch roller. In one embodiment, the hot roll production line is a production line capable of both coiling and flat rolling. Preferably, under coiling conditions, the tension roller 1 adopts a passive rotation mode, and under flat rolling conditions, the tension roller 1 adopts an active rotation mode. This ensures high operational reliability of the tension roller 1, better protects the tension roller 1, and extends its service life.

[0029] Optionally, the first driving mechanism includes a driving unit and a transmission unit 22, with the transmission unit 22 connected to the tension roller 1 and the driving unit, respectively.

[0030] The aforementioned drive unit includes, but is not limited to, a motor 21; the aforementioned transmission unit 22 can adopt a transmission method such as belt drive, chain drive, gear drive, etc., including a drive wheel 221 and a driven wheel 222. The drive wheel 221 is connected to the output shaft of the drive unit, and the driven wheel 222 is connected to the roller shaft 111 of the tension roller 1. The drive wheel 221 can be coaxially connected to the output shaft of the drive unit through a transmission shaft 241. In this embodiment, the drive wheel 221 and the driven wheel 222 are connected by a belt or a transmission chain, that is, the aforementioned transmission unit 22 adopts a belt drive or chain drive method.

[0031] like Figure 2 and Figure 4 The roller shaft 111 of the tension roller 1 can be appropriately extended to facilitate the installation of the driven wheel 222.

[0032] More preferably, such as Figure 2 The aforementioned drive shaft 241 adopts a segmented splicing form, including but not limited to configuring two or more coupling boxes 242, which facilitates disassembly and assembly and improves the tolerance of installation accuracy errors. It also ensures that this transmission design can be applied to on-site modification projects and pass through existing equipment. The aforementioned drive shaft 241 can further be configured with one or more drive bearing seats 243 to ensure its operational reliability.

[0033] Preferably, the transmission unit 22 is designed to meet the requirement that the tension roller 1 has both an active rotation mode and a passive rotation mode. In one embodiment, such as Figure 2 and Figure 4 The transmission unit 22 further includes a rotation direction conversion controller, which is connected to the passive wheel 222 and the roller shaft 111 respectively, and is used to control whether the roller shaft 111 rotates with the passive wheel 222.

[0034] The passive wheel 222 is connected to the roller shaft 111 of the tension roller 1 via a passive wheel bearing.

[0035] In one embodiment, the rotation direction change controller includes a clutch 23, the driven portion of which is connected to the driven wheel 222, and the driving portion of which is connected to the roller shaft 111. Optionally, the clutch 23 is keyed to the roller shaft 111 of the tension roller 1; the clutch 23 and the driven wheel 222 are fixedly connected, including but not limited to being connected by connecting screws and torque transmission pins.

[0036] Alternatively, the rotation direction change controller and the driven wheel 222 can be secured to the shoulder of the roller 111 via a stop to prevent axial displacement of the rotation direction change controller and the driven wheel 222.

[0037] Optionally, the aforementioned rotation direction change controller / clutch 23 uses hydraulic oil as the working medium. In one embodiment, such as Figure 4 A dual-channel oil rotary joint 230 is provided at the end of the roller shaft 111 of the tension roller 1 to meet the normal oil supply and return in the two rotation modes of the tension roller 1, thereby realizing that the torque output by the first drive mechanism can flexibly match the different functional requirements of the tension roller 1. Among them, the roller shaft 111 is provided with an oil inlet channel and an oil return channel, which are connected to the aforementioned rotation direction change controller and the aforementioned dual-channel oil rotary joint 230.

[0038] In one embodiment, the drive unit uses a torque motor 21. On the one hand, in the passive rotation mode of the tension roller 1, if the rotation direction conversion controller fails, the torque motor 21 will be in a generating state under the action of the passive torque of the reverse rotation, which will not cause damage to the torque motor 21. On the other hand, in the active rotation mode of the tension roller 1, the torque motor 21 can adaptively output the torque to drive the tension roller 1 to rotate according to the shaft power of the load end. Once the tension roller 1 is jammed or the rotation direction conversion controller fails, the torque motor 21 will actively control the maximum output torque, thereby ensuring that the motor 21 is not overloaded and burned out, and also ensuring that the failure of other transmission components does not worsen further, giving maintenance personnel a certain amount of time to handle the problem, and ensuring the long life and high utilization rate of each transmission device.

[0039] Example 2

[0040] This utility model embodiment provides a tension roller device, which can be used to optimize the tension roller device in the above embodiment one, that is, it can be a further structural optimization based on the tension roller device in the above embodiment one.

[0041] like Figures 1-3 The tension roller device includes a tension roller 1 and a first drive mechanism for driving the tension roller to rotate. Furthermore, it also includes a second drive mechanism for driving the tension roller 1 to move between the working position and the maintenance position, which facilitates the inspection and maintenance of the tension roller 1.

[0042] In one embodiment, such as Figure 2 and Figure 3 The second drive mechanism includes a rocker arm and a rocker arm drive unit 33. The tension roller 1 is mounted on the rocker arm, and the rocker arm drive unit 33 is connected to the rocker arm to drive the rocker arm to swing around a swing axis, thereby driving the tension roller 1 to swing, so as to realize the movement of the tension roller 1 between the working position and the maintenance position. The swing axis is parallel to the axis of the tension roller 1 and has a gap.

[0043] like Figure 2Preferably, the rocker arm includes two parallel, spaced-apart arms 31, with the two side roller shafts 111 of the tension roller 1 rotatably mounted on the two arms 31 respectively. The two arms 31 can be connected in series via a rocker arm connecting beam 32. Specifically, the two arms 31 are fixedly mounted on the rocker arm connecting beam 32, in which case the rocker arm connecting beam 32 can be connected to the rocker arm drive unit 33. The axis of the rocker arm connecting beam 32 coincides with the aforementioned swing axis; both ends of the rocker arm connecting beam 32 can be supported by rocker arm bearing seats.

[0044] When the transmission unit 22 of the first drive mechanism adopts belt drive / chain drive, the above-mentioned swing axis can be set to coincide with the axis of the drive wheel 221, which can avoid the chain / belt from loosening during the swing of the tension roller 1 and improve the transmission accuracy accordingly.

[0045] The aforementioned rocker arm drive unit 33 can be a linear drive device such as a hydraulic cylinder or a pneumatic cylinder. The housing of the rocker arm drive unit 33 is hinged to the workshop foundation or to the tension roller frame. The output end of the rocker arm drive unit 33 is hinged to the aforementioned rocker arm, for example, to the aforementioned rocker arm connecting beam 32, with the hinge axis parallel to the aforementioned swing axis. Optionally, such as... Figure 2 and Figure 3 One end of the rocker arm connecting beam 32 extends out of the corresponding side rocker arm bearing seat to form a rocker arm drive rod 321, which is connected to the rocker arm drive unit 33.

[0046] In one embodiment, such as Figure 3 The aforementioned tension roller device also includes a locking mechanism for locking the rocker arm in the maintenance position to ensure the safety of tension roller 1 maintenance operations. Optionally, the locking mechanism includes a pin cylinder 341 and a safety pin 342, with the safety pin 342 located at the output end of the pin cylinder 341, and a corresponding pin hole provided on the rocker arm.

[0047] Preferably, the rocker arm is connected to the rocker arm drive unit 33 via a rocker arm drive rod 321. In this case, the pin hole can be set on the rocker arm drive rod 321. The position of the pin cylinder 341 obviously matches the position of the pin hole at the maintenance position. The rocker arm drive rod 321 can be a structure formed by extending the rocker arm connecting beam 32.

[0048] Preferably, such as Figure 3 The tension roller device includes a frame, on which the aforementioned rocker arm bearing seat and other equipment can be installed, and the aforementioned pin cylinder 341 can also be installed on the frame.

[0049] Preferably, such as Figure 2 and Figure 3The rocker arm drive rod 321 is designed with a flange structure, that is, it has a flange portion 3211. The aforementioned pin hole is provided on the flange portion 3211, which can facilitate the engagement with the aforementioned safety pin 342, thereby shortening the working stroke of the pin cylinder 341 accordingly.

[0050] In one embodiment, the rocker arm connecting beam 32 is equipped with a rocker arm cooling structure, which can compensate for the thermal expansion and contraction of materials at different temperatures and extend the service life of the rocker arm. Optionally, such as Figure 7 A water-cooled cavity is formed within the rocker arm connecting beam 32, and a cooling core tube 322 is installed within this cavity. The outlet end of the cooling core tube 322 communicates with the water-cooled cavity. One end of the rocker arm connecting beam 32 / rocker arm drive rod 321 is provided with a rocker arm rotary joint 33. The rocker arm rotary joint 33 has a cooling water inlet communicating with the inlet end of the cooling core tube 322 and a cooling water outlet communicating with the water-cooled cavity. The cooling core tube 322 can be a multi-segment series structure, and the core tube segments can be connected by flexible connectors 3221.

[0051] Example 3

[0052] This utility model embodiment provides a tension roller 1, which can be used in the above embodiment one / embodiment two.

[0053] like Figures 4-6 The tension roller 1 mentioned above includes a roller body 10, a drive-side shaft head and an operating-side shaft head. The drive-side shaft head and the operating-side shaft head are respectively equipped with tension roller bearing seats. When applied in the above embodiment 2, the arm 31 mentioned above can be configured as a tension roller bearing seat accordingly. Alternatively, a bearing seat cover is provided on the shaft head 12, and a bearing seat base is provided on the arm 31. The two are assembled to form a split bearing seat.

[0054] Preferably, the outer surface of the roller body 10 is provided with a heat-resistant and wear-resistant layer 101, which can correspondingly extend the service life of the tension roller 1. The heat-resistant and wear-resistant layer 101 includes, but is not limited to, a weld overlay structure, such as weld overlay made of heat-resistant stainless steel. Optionally, the thickness of the heat-resistant and wear-resistant layer 101 is in the range of 10 to 40 mm. For the heat-resistant and wear-resistant weld overlay, its thickness can be controlled at around 25 mm.

[0055] Preferably, the roller body 10 is provided with a roller body cooling structure, which can cool the roller body 10 and greatly extend the service life of the tension roller 1, including the service life of the roller body 10 and the service life of the roller bearings 113 at both ends.

[0056] In one embodiment, such as Figure 4 and Figure 5The roller cooling structure includes an inner liner 13 disposed inside the roller body 10 and forming an insulating heat zone with the inner wall of the roller body, and a flow guide 15 disposed inside the insulating heat zone. A cooling medium channel communicating with the insulating heat zone is provided on the drive side shaft head and / or the operating side shaft head.

[0057] The aforementioned cooling medium channel includes a medium supply channel and a medium return channel. By supplying cooling medium into the insulating heat line, heat from the roller body 10 is carried away, thus achieving cooling of the roller body 10. Preferably, the aforementioned guide 15 ensures that the cooling medium within the insulating heat line remains in a turbulent state, which improves heat exchange efficiency. In one embodiment, such as... Figure 5 The aforementioned guide tube 15 is a spiral guide tube 15, which allows the cooling medium to circulate spirally within the insulating heat strip. More preferably, the spiral helix angle α of the spiral guide tube 15 relative to the axis of the roller body 10 is 55 to 60°, which is beneficial to achieving the aforementioned turbulent flow state. In particular, when the height h of the aforementioned insulating heat strip (i.e., the distance between the inner liner 13 and the roller body 10) is in the range of 60 to 80 mm, and the cooling medium is cooling water, the Reynolds coefficient Re of the cooling water can be made > 4000. The cooling water in this state is basically in a turbulent state, thereby improving the heat exchange efficiency.

[0058] The spiral guide 15 can be fixed to the inner liner 13, or to the roller body 10, or fixed to both the inner liner 13 and the roller body 10 respectively.

[0059] The inner liner 13 is preferably a sealed hollow structure, which reduces the weight of the tension roller 1 and provides good heat insulation, further extending the service life of the tension roller 1. Based on the multi-layer heat insulation structure of the roller body 10-insulation heat pack-inner liner 13, coupled with the cooling effect within the insulation heat pack, the heat from the roller body 10 can be largely prevented from being transferred to the roller bearings 113 at both ends of the shaft head 12, thereby extending the service life of the roller body 10, the shaft head 12, and the roller bearings 113.

[0060] In one embodiment, such as Figures 4-6 The aforementioned medium supply channel includes a water inlet pipe 14, which extends into the roller body 10 via a drive-side shaft head or an operating-side shaft head and communicates with the aforementioned heat insulation material; furthermore, the water inlet pipe 14 passes through the inner liner 13, so that the inner liner 13 can be installed through the water inlet pipe 14, and the arrangement of the water inlet pipe 14 is also convenient.

[0061] Preferably, the inner liner 13 and the two end shafts 12 are spaced apart and correspondingly enclosed to form end heat insulation cavities. The spaced apart can be the same as or different from the height of the heat insulation strip. The outlet end of the water inlet pipe 14 preferably extends into one of the end heat insulation cavities, and the above-mentioned medium return channel is preferably connected to the other end heat insulation cavity.

[0062] Optionally, such as Figure 4 and Figure 5 A gap exists between the water inlet pipe 14 and the inner wall of the corresponding side shaft head 12 to form the aforementioned medium return channel. This facilitates the circulation management of cooling water by allowing water to enter and exit from the same side. A return water pipe is connected to the corresponding side shaft head 12, and this return water pipe communicates with the aforementioned medium return channel.

[0063] Example 4

[0064] This utility model embodiment provides a tension roller 1, which can be used in the above embodiments one to three.

[0065] like Figure 5 and Figure 6 The tension roller 1 mentioned above includes a roller body 10, a drive-side shaft head and an operating-side shaft head. Both the drive-side shaft head and the operating-side shaft head are equipped with roller bearings 113 and roller bearing seats 112. The drive-side shaft head and / or the operating-side shaft head are connected to a roller rotary joint.

[0066] In the structure of the tension roller bearing housing using a split bearing housing, the aforementioned roller bearing housing 112 can correspondingly adopt the structure of a bearing cover.

[0067] Optionally, at least one of the roller bearing housings 112 is a combined sealed bearing housing, wherein a first sealing structure is provided on the side of the combined sealed bearing housing near the roller body 10, and a second sealing structure is provided on the side away from the roller body 10.

[0068] In one embodiment, such as Figure 5 and Figure 6 The first sealing structure includes a bearing skeleton oil seal 161, which can be assembled onto the bearing housing 112 via a split gland 162. Furthermore, a waterproof cover 163 can be provided on the outside of the split gland.

[0069] In one embodiment, such as Figure 5 and Figure 6 A limiting collar 114 is provided on the side of the combined sealed bearing housing away from the roller body 10. The limiting collar 114 is fixedly connected to the corresponding shaft head 12 and abuts against the combined sealed bearing housing. The limiting collar 114 can not only limit the axial displacement of the bearing housing 112 and the roller bearing 113, but also play a role in waterproofing and dustproofing.

[0070] Preferably, such as Figure 5 and Figure 6 The second sealing structure includes a first inner seal 165, which includes, but is not limited to, a lip seal, which is pressed between the limiting collar 114 and the shaft head 12 (a sealing shoulder may be machined on the shaft head 12 accordingly).

[0071] like Figure 5 and Figure 6 A locking nut 164 can be screwed onto the corresponding shaft head 12. The locking nut 164 abuts against the corresponding roller bearing 113, which not only restricts the axial displacement of the roller bearing 113, but also provides a sealing effect.

[0072] When a roller rotary joint is connected to the corresponding shaft head 12, the roller rotary joint can be configured as a mechanical seal as part of the second sealing structure described above.

[0073] In one embodiment, such as Figure 5 and Figure 6 The aforementioned roller rotary joint includes a sealing mandrel 15, which is fixedly connected to the corresponding shaft head 12; more preferably, as Figure 5 and Figure 6 The mounting end of the sealing mandrel 15 adopts a stepped inner ring wall. The large diameter section 151 of the stepped inner ring wall is closer to the roller body 10 than its small diameter section. Preferably, the stepped surface of the stepped inner ring wall abuts against the end face of the corresponding shaft head 12. An annular threaded hole is machined at the end of the corresponding shaft head. The large diameter section 151 is threaded and screwed into the annular threaded hole.

[0074] Optionally, fasteners such as long bolts can be used to further fix the connection between the sealing mandrel 15 and the corresponding shaft head 12; taking the use of long bolts as an example, the long bolt passes through the stepped surface of the inner ring wall of the stepped shaft and the end face of the corresponding shaft head 12.

[0075] More preferably, such as Figure 5 and Figure 6 The second sealing structure includes a second inner seal 166, which is disposed between the outer wall of the sealing mandrel 15 and the large-diameter annular wall of the annular threaded hole. The second inner seal 166 includes, but is not limited to, a trapezoidal dust seal.

[0076] By combining the first and second sealing structures, a multi-layered seal consisting of a protective seal, a skeleton seal, a lip seal, and a mechanical seal can be formed, ensuring that the working environment of the roller bearing 113 is free of water and dust.

[0077] like Figure 5 and Figure 6 Preferably, there is a mandrel gap between the sealing mandrel 15 and the limiting ring 114.

[0078] Preferably, when applied to the tension roller 1 of the above embodiment 3, a water collection tank 17 is formed in the mandrel gap, the above-mentioned medium return channel is connected to the water collection tank 17, and the water collection tank 17 is connected to the return water pipe. The return water with increased water temperature enters the water collection tank 17 through the medium return channel and then flows into the return water pipe.

[0079] Correspondingly, a return water port communicating with the aforementioned water collection tank 17 is provided on the sealing mandrel 15.

[0080] In one embodiment, such as Figure 5 and Figure 6 In the mandrel gap, at least one lip-shaped water seal 167 is provided on both sides of the water collection tank 17. Based on this design, during the rotation of the tension roller 1, the return water can be prevented from entering the bearing housing 112 and the dry oil lubrication seal can be maintained for a long service life. Moreover, the dry oil contaminated by water can be directly discharged to the outside of the tension roller 1 through the water collection tank 17.

[0081] More preferably, such as Figure 5 and Figure 6 Multiple lip-shaped water seals 167 are provided on both sides of the water collection tank 17, and the arrangement of the lip-shaped water seals 167 on both sides is symmetrical with respect to the water collection tank 17. For each lip seal 167 between the water collection trough 17 and the roller body 10, preferably, with the orientation of the roller body 10 relative to the water collection trough 17 as the reference direction, among the lip seals 167 between the water collection trough 17 and the roller body 10, the lip direction of the lip seal 167 closest to the water collection trough 17 is opposite to the reference direction, while the lip direction of the remaining lip seals 167 is the same as the reference direction. For example, when the roller body 10 is located on the left side of the water collection trough 17 (for example, when the corresponding shaft head 12 is the operating side shaft head), the lip seal 167 closest to the water collection trough 17 is the right lip seal, and the rest are all left lip seals. Taking four lip seals 167 on the left and right sides of the water collection trough 17 as an example, they are arranged in a "left-left-right-left + left-right-right-right" pattern from left to right according to the lip direction. This arrangement strategy of the lip seal 167 can greatly ensure that water does not enter the bearing housing 112, and ensure that while the dry oil lubricates the lip seal, excess dry oil can enter the bearing for lubrication, thereby improving the working reliability of the tension roller 1.

[0082] More preferably, a water seal gap 168 is provided between each two adjacent lip seals 167, which can better prevent the lip seal from deforming.

[0083] More preferably, in the above-mentioned "left-left-right-left + left-right-right-right" arrangement structure of the lip seal 167, the water seals 168 are arranged from left to right according to the following strategy: 1 left-handed oil inlet water seal - 1 left-handed water seal - 1 through-core oil inlet water seal - 1 through-core oil inlet water seal - 1 right-handed water seal - 1 right-handed oil inlet water seal. This arrangement forms a flexible water seal combination, which can achieve a better effect in preventing lip seal deformation. In addition to preventing lip seal deformation, the left-handed oil inlet water seal, the through-core oil inlet water seal, and the right-handed oil inlet water seal are also responsible for passing dry oil to the surface of each lip seal, thus extending its service life.

[0084] Optionally, such as Figure 5 and Figure 6 A spindle end cap 115 is detachably connected to the outer end of the limiting collar 114, wherein the outermost lip seal 167 can be pressed by the spindle end cap 115. An inlet and / or outlet can be provided on the spindle end cap 115 to facilitate the entry and exit of cooling water.

[0085] Example 5

[0086] This utility model provides a coil production line, including a coiling furnace, an inlet pinch roller and an outlet pinch roller. A tension roller device is arranged between the coiling furnace and the inlet pinch roller and / or between the coiling furnace and the outlet pinch roller. At least one set of tension roller devices adopts the tension roller device in Embodiment 1 / Embodiment 2 above, or adopts the tension roller 1 in Embodiment 3 / 4 above.

[0087] Preferably, the above-mentioned furnace coil production line is a production line that can perform both coil rolling and flat rolling.

[0088] Accordingly, a production method for the aforementioned hot-rolled coil production line is also provided, including:

[0089] In the coil rolling production mode, the tension roller 1 adopts a passive rotation mode, while in the flat rolling production mode, the tension roller 1 adopts an active rotation mode.

[0090] In flat rolling mode, tension roll 1 rotates continuously and actively, which can distribute high temperature evenly across the entire circumference of tension roll 1, effectively extending the service life of tension roll 1.

[0091] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tension roller device that is easy to maintain, comprising a tension roller and a first drive mechanism for driving the tension roller to rotate, characterized in that, It also includes a second drive mechanism for moving the tension roller between a working position and a maintenance position. The second drive mechanism includes a rocker arm and a rocker arm drive unit for driving the rocker arm to swing about a swing axis. The tension roller is mounted on the rocker arm, and the swing axis is parallel to and spaced from the axis of the tension roller.

2. The tension roller device as described in claim 1, characterized in that: It also includes a locking mechanism for locking the rocker arm in the maintenance position.

3. The tension roller device as described in claim 2, characterized in that: The locking mechanism includes a pin cylinder and a safety pin. The safety pin is located at the output end of the pin cylinder, and a pin hole is provided on the rocker arm accordingly.

4. The tension roller device as described in claim 3, characterized in that: The rocker arm is connected to the rocker arm drive unit via a rocker arm drive rod; the rocker arm drive rod is designed as a flange structure, and the pin hole is provided on its flange portion.

5. The tension roller device as described in claim 1, characterized in that: The rocker arm includes two arms spaced in parallel, and the two roller shafts of the tension roller are rotatably mounted on the two arms respectively.

6. The tension roller device as described in claim 5, characterized in that: The two booms are connected in series via a rocker arm connecting beam.

7. The tension roller device as described in claim 6, characterized in that: The rocker arm connecting beam is equipped with a rocker arm cooling structure.

8. The tension roller device as described in claim 7, characterized in that: The rocker arm cooling structure includes a water-cooled cavity formed in the rocker arm connecting beam, and a cooling core tube is provided in the water-cooled cavity, with the outlet end of the cooling core tube communicating with the water-cooled cavity.

9. The tension roller device as described in claim 8, characterized in that: The cooling core tube adopts a multi-segment series structure, and the core tube segments are connected by flexible connectors.

10. A coil production line, comprising a coiling furnace, an inlet pinch roll, and an outlet pinch roll, wherein a tension roll device is arranged between the coiling furnace and the inlet pinch roll and / or between the coiling furnace and the outlet pinch roll, characterized in that: At least one set of tension roller devices employs the tension roller device as described in any one of claims 1 to 9.

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