Reliable-working tension roller and furnace coil production line

Abstract

The invention relates to a tension roller reliable in work, a roller body cooling structure is arranged in a roller body, at least one roller bearing seat is a sealed bearing seat, one side, away from the roller body, of the sealed bearing seat is provided with a limiting shaft ring and a sealed mandrel, and the limiting shaft ring is fixedly connected with a corresponding shaft head and abuts against the sealed bearing seat; the sealing mandrels are fixedly connected to the corresponding shaft heads, mandrel gaps are formed between the sealing mandrels and the limiting shaft rings, water collecting grooves are formed in the mandrel gaps, at least one lip-shaped water seal is arranged on each of the two sides of each water collecting groove, and a medium backflow channel of the roller body cooling structure is communicated with the water collecting grooves. In addition, the invention also relates to a furnace coil production line equipped with the tension roller. According to the tension roller, the water collecting tank is arranged in the gap of the mandrel, the lip-shaped water seals are arranged on the two sides of the water collecting tank respectively, in the rotating process of the tension roller, cooling water return water does not enter the bearing seat, dry oil is injected for lubrication and sealing, the dry oil polluted by water can be directly discharged out of the tension roller through the water collecting tank, and the service life of the tension roller is prolonged. Therefore, the working reliability of the tension roller can be effectively improved.

Description

Technical Field

[0001] The present invention relates to a tension roll with reliable operation and a coil annealing production line configured with the tension roll. Background Art

[0002] Due to its advantages such as short process flow, simplified process, few equipment, low investment, large range of producible products, flexible production, and high product precision, the coil annealing production line has a sufficiently wide application market in the industry. It is a classic technology for rolling strip steel, especially having unique advantages in rolling stainless steel with high temperature sensitivity. However, its output is far from that of conventional hot continuous rolling and it is difficult to meet the requirements of large production capacity and high output. Therefore, it is currently only applied in the stainless steel production field.

[0003] Currently, a tension roll for adjusting the tension during strip coiling is provided between the coiling furnace and the pinch roll. Since this tension roll is installed on the pinch roll base and is exactly arranged near the steel inlet and outlet of the coiling furnace, it is baked by the high temperature (about 1000°C) in the coiling furnace during the operation and standby of the tension roll. Especially for the medium and heavy plate production line that can perform both coiling rolling and flat rolling, when the tension roll is in the standby position, long-term baking will cause multiple life bottlenecks such as bearing burnout, seal failure, roll surface failure, bearing seat deformation, and roll deformation. For this reason, existing tension rolls generally have cooling measures, but when cooling water enters the roll body from the rotary joint, it is easy to have the situation that cooling water enters the bearing seat and other places due to seal failure, affecting the normal operation of the tension roll. Summary of the Invention

[0004] The present invention relates to a tension roll with reliable operation and a coil annealing production line configured with the tension roll, which can at least solve some defects of the prior art.

[0005] The present invention relates to a tension roll with reliable operation, including a roll body, a drive side shaft head, and an operating side shaft head. Roller bearings and roller bearing seats are assembled on both the drive side shaft head and the operating side shaft head. A roll body cooling structure is provided inside the roll body. At least one of the roller bearing seats is a sealed bearing seat. A limiting shaft ring and a sealing core shaft are provided on the side of the sealed bearing seat away from the roll body. The limiting shaft ring is fixedly connected to the corresponding shaft head and abuts against the sealed bearing seat. The sealing core shaft is fixedly connected to the corresponding shaft head. There is a core shaft gap between the sealing core shaft and the limiting shaft ring. A water collecting tank is formed in the core shaft gap, and at least one lip seal is provided on each side of the water collecting tank. The medium return channel of the roll body cooling structure is communicated with the water collecting tank.

[0006] As one of the embodiments, a plurality of lip seals are respectively provided on both sides of the water collecting tank, and the lip seals on both sides are arranged symmetrically with respect to the water collecting tank.

[0007] As one of the implementation manners, taking the orientation of the roll body relative to the water collecting tank as the reference direction, among the lip-type water seals between the water collecting tank and the roll body, the lip direction of the lip-type water seal closest to the water collecting tank is opposite to this reference direction, and the lip directions of the remaining lip-type water seals are the same as this reference direction.

[0008] As one of the implementation manners, the roller bearing housing on the operating side shaft head is a sealed bearing housing. Among them, there are four lip-type water seals on the left and right sides of the water collecting tank respectively. Defining the orientation of the roll body relative to the water collecting tank as the left side, from left to right, it is arranged in the form of "left left left right + left right right right" according to the lip direction.

[0009] As one of the implementation manners, a water seal partition is provided between every two adjacent lip-type water seals on each side. The water seal partitions are arranged according to the following strategy from left to right: 1 left-handed oil inlet water seal partition - 1 left-handed water seal partition - 1 through-core oil inlet water seal partition - 1 through-core oil inlet water seal partition - 1 right-handed water seal partition - 1 right-handed oil inlet water seal partition.

[0010] As one of the implementation manners, a plurality of lip-type water seals are respectively arranged on both sides of the water collecting tank, and a water seal partition is provided between every two adjacent lip-type water seals on each side of the water collecting tank.

[0011] As one of the implementation manners, a first inner seal is clamped between the limit shaft collar and the corresponding shaft head.

[0012] As one of the implementation manners, the installation end of the sealed core shaft adopts the inner wall of a stepped shaft. The large-diameter section of the inner wall of this stepped shaft is closer to the roll body than its small-diameter section. An annular threaded hole is machined at the end of the corresponding shaft head. Threads are machined on the large-diameter section and are screwed with this annular threaded hole; a second inner seal is provided between the outer wall of the sealed core shaft and the large-diameter annular wall of the annular threaded hole.

[0013] As one of the implementation manners, a sealing structure is further provided on the side of the sealed bearing housing close to the roll body.

[0014] The present invention also relates to a furnace coil production line, including a coiling furnace, an inlet pinch roll, and an outlet pinch roll. 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. At least one group of the tension roll devices adopts the tension roll as described above.

[0015] The present invention has at least the following beneficial effects:

[0016] In the present invention, a water collecting trough is arranged in the core shaft gap, and lip seals are respectively arranged on both sides of the water collecting trough. During the rotation of the tension roller, the return water of the cooling water can be prevented from entering the bearing housing, and dry oil lubrication seal can be injected to maintain a long service life. Moreover, the contaminated dry oil can be directly discharged to the outside of the tension roller through the water collecting trough, thereby effectively improving the working reliability of the tension roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is the front view of the tension roller device;

[0019] Figure 2 is the axonometric view of the tension roller device;

[0020] Figure 3 is the left view of the tension roller device;

[0021] Figure 4 is Figure 1 the partial sectional view A-A in

[0022] Figure 5 is Figure 1 the partial sectional view B-B in

[0023] Figure 6 is Figure 5 the partial structural schematic diagram in

[0024] Figure 7 is Figure 1 the partial sectional view C-C in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] Embodiment 1

[0027] As Figures 1-4, an embodiment of the present invention provides a tension roll device, including a tension roll 1 and a first driving mechanism. The first driving mechanism is configured to enable the tension roll 1 to have an active rotation mode and a passive rotation mode: in the active rotation mode, the first driving mechanism drives the tension roll 1 to rotate actively; in the passive rotation mode, the tension roll 1 is configured as a passive tension roll, that is, the first driving mechanism does not output a force to the tension roll 1.

[0028] The above-mentioned tension roll device can be applied to a coil annealing production line, for example, arranged between a coiling furnace and an entry pinch roll, and / or arranged between a coiling furnace and an exit pinch roll. In one embodiment, the above-mentioned coil annealing production line is a production line that can perform both coil rolling and flat rolling. Preferably, in the coil rolling working condition, the tension roll 1 adopts the passive rotation mode, and in the flat rolling working condition, the tension roll 1 adopts the active rotation mode, which can ensure that the tension roll 1 has high working reliability, and can better protect the tension roll 1 and extend its service life.

[0029] Optionally, the above-mentioned first driving mechanism includes a driving unit and a transmission unit 22. The transmission unit 22 is respectively connected to the tension roll 1 and the driving unit.

[0030] Among them, the above-mentioned driving unit includes but is not limited to using a motor 21; the above-mentioned transmission unit 22 can adopt transmission methods such as belt drive, chain drive, and gear drive, including a driving wheel 221 and a driven wheel 222. The driving wheel 221 is connected to the output shaft of the driving unit, and the driven wheel 222 is connected to the roll shaft 111 of the tension roll 1. Among them, the driving wheel 221 can be coaxially connected to the output shaft of the driving unit through a transmission shaft 241; in this embodiment, the driving wheel 221 and the driven wheel 222 are connected by a belt or a transmission chain, that is, the above-mentioned transmission unit 22 adopts a belt drive or a chain drive method.

[0031] Such as Figure 2 and Figure 4 , the roll shaft 111 of the tension roll 1 can be appropriately extended to facilitate the installation of the driven wheel 222.

[0032] Further preferably, such as Figure 2 , the above-mentioned transmission shaft 241 adopts a segmented splicing form, including but not limited to configuring two or more coupling boxes 242, which is convenient for disassembly and assembly and can improve the tolerance of installation precision errors, and also ensures the ability of this transmission design to be applied to on-site renovation projects to pass through existing equipment. The above-mentioned transmission shaft 241 can further be configured with one or more transmission bearing seats 243 to ensure its working reliability.

[0033] Preferably, by designing the above-mentioned transmission unit 22, the requirements for enabling the tension roll 1 to have an active rotation mode and a passive rotation mode are met. In one embodiment, such as Figure 2 andFigure 4 , the above-mentioned transmission unit 22 further includes a rotation direction conversion controller, which is respectively connected to the driven wheel 222 and the roller shaft 111, and is used to control whether the roller shaft 111 rotates following the driven wheel 222.

[0034] Among them, the driven wheel 222 is connected to the roller shaft 111 of the tension roller 1 through a driven wheel bearing.

[0035] In one embodiment, the rotation direction conversion controller includes a clutch 23. The driven part of the clutch 23 is connected to the driven wheel 222, and the driving part of the clutch 23 is connected to the roller shaft 111. Optionally, the clutch 23 is key-connected to the roller shaft 111 of the tension roller 1; the connection between the clutch 23 and the driven wheel 222 is a fixed connection, including but not limited to being connected by connecting screws and torque transmission pins.

[0036] In addition, the rotation direction conversion controller and the driven wheel 222 can be clamped on the shoulder of the roller shaft 111 through a spigot to prevent axial displacement of the rotation direction conversion controller and the driven wheel 222.

[0037] Optionally, the above-mentioned rotation direction conversion controller / clutch 23 uses hydraulic oil as the working medium. In one embodiment, as Figure 4 , a two-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 oil return in the two rotation modes of the tension roller 1, so as to realize that the torque output by the first driving mechanism can flexibly match the different functional requirements of the tension roller 1. Among them, an oil inlet channel and an oil return channel are provided in the roller shaft 111, and the oil inlet channel and the oil return channel are communicated with the above-mentioned rotation direction conversion controller and the above-mentioned two-channel oil rotary joint 230.

[0038] In one embodiment, the above-mentioned driving 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 power generation state under the action of the reverse rotation passive torque, and the situation of damage to the torque motor 21 will not occur; 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 rotation of the tension roller 1 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, so as to ensure that the motor 21 is not burned out due to overload, and it can also ensure that the failure of other transmission components will not deteriorate further, leaving a certain amount of processing time for maintenance personnel to ensure the long life and high utilization rate of each transmission device.

[0039] Embodiment 2

[0040] An embodiment of the present invention provides a tension roller device. Among them, this tension roller device can be used to optimize the tension roller device in the first embodiment above, that is, it can be a further structural optimization based on the tension roller device in the first embodiment above.

[0041] As Figures 1-3 , the tension roller device includes a tension roller 1 and a first driving mechanism. Further, it also includes a second driving mechanism for driving the tension roller 1 to move between a working position and a maintenance position, so as to facilitate operations such as inspection and maintenance of the tension roller 1.

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

[0043] As Figure 2 , preferably, the above rocker arm includes two arm rods 31 arranged in parallel at intervals. The two side roller shafts 111 of the tension roller 1 are respectively rotatably installed on the two arm rods 31; the two arm rods 31 can be connected in series through a rocker arm connecting beam 32. Specifically, the two arm rods 31 are fixedly installed on the rocker arm connecting beam 32. In this case, the rocker arm connecting beam 32 can be connected to the rocker arm driving unit 33. Among them, the axis of the rocker arm connecting beam 32 coincides with the above 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 driving mechanism adopts a belt drive / chain drive mode, the above swing axis can be set to coincide with the axis of the driving wheel 221, which can avoid the loosening of the chain / belt during the swinging process of the tension roller 1 and can correspondingly improve the transmission accuracy.

[0045] The above rocker arm driving unit 33 can adopt linear driving devices such as hydraulic cylinders and air cylinders. The housing of the rocker arm driving unit 33 is hingedly installed on the workshop foundation or installed on the tension roller frame, and the output end of the rocker arm driving unit 33 is hinged to the above rocker arm, for example, hinged to the above rocker arm connecting beam 32. The axis of the hinge shaft is parallel to the above swing axis. Optionally, 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 driving rod 321, and the rocker arm driving rod 321 is connected to the rocker arm driving unit 33.

[0046] In one embodiment, as Figure 3, the above-mentioned tension roll device further includes a locking mechanism for locking the rocker arm in the maintenance position to ensure the safety of the maintenance operation of the tension roll 1. Optionally, the above-mentioned locking mechanism includes a pin cylinder 341 and a safety pin 342. The safety pin 342 is arranged at the output end of the pin cylinder 341. Correspondingly, a pin hole is arranged on the rocker arm, including but not limited to arranging the pin hole on the above-mentioned rocker arm driving rod 321; the installation position of the pin cylinder 341 obviously matches the position of the pin hole at the maintenance position.

[0047] Among them, preferably, as Figure 3 , the tension roll device includes a frame, and devices such as the above-mentioned rocker arm bearing seat can be installed on this frame, and the above-mentioned pin cylinder 341 can also be arranged on this frame.

[0048] Among them, preferably, as Figure 2 and Figure 3 , the rocker arm driving rod 321 is designed as a flange structure, that is, it has a flange portion 3211, and the above-mentioned pin hole is arranged on this flange portion 3211, which can facilitate the cooperation with the above-mentioned safety pin 342, and correspondingly shorten the working stroke of the pin cylinder 341.

[0049] In one embodiment, a rocker arm cooling structure is provided inside the rocker arm connecting beam 32, which can compensate for the thermal expansion and contraction of materials at different temperatures and extend the service life of the rocker arm. Optionally, as Figure 7 , a water cooling cavity is formed inside the rocker arm connecting beam 32, and a cooling core tube 322 is arranged in this water cooling cavity. The outlet end of the cooling core tube 322 is communicated with the water cooling cavity. One end of the rocker arm connecting beam 32 / rocker arm driving rod 321 is provided with a rocker arm rotary joint 33, and this rocker arm rotary joint 33 is provided with a cooling water inlet communicated with the inlet end of the cooling core tube 322 and a cooling water outlet communicated with the water cooling cavity. Among them, the above-mentioned cooling core tube 322 can adopt a multi-segment series connection structure, and the core tube segments can be connected through a flexible connector 3221.

[0050] Embodiment III

[0051] The embodiment of the present invention provides a tension roll 1, among which, this tension roll 1 can be used in the above-mentioned Embodiment I / Embodiment II.

[0052] As Figures 4-6 , the above-mentioned tension roll 1 includes a roll 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 configured with tension roll bearing seats. When applied to the above-mentioned Embodiment II, the above-mentioned arm rod 31 can correspondingly be configured as a tension roll bearing seat, or a bearing seat upper cover is arranged on the shaft head 12, and a bearing seat base is arranged on the above-mentioned arm rod 31, and the two are assembled to form a split bearing seat.

[0053] Preferably, a heat-resistant and wear-resistant layer 101 is provided on the outer surface of the roll body 10, which can correspondingly extend the service life of the tension roll 1. The heat-resistant and wear-resistant layer 101 includes, but is not limited to, a surfacing layer structure, for example, it is made by surfacing with heat-resistant stainless steel material. Optionally, the thickness of the heat-resistant and wear-resistant layer 101 is in the range of 10 - 40 mm. For the heat-resistant and wear-resistant surfacing layer, its thickness can be controlled at about 25 mm.

[0054] Preferably, a roll body cooling structure is provided inside the roll body 10, which can cool the roll body 10 and greatly extend the service life of the tension roll 1, including the service life of the roll body 10 and the service life of the roller bearings 113 at both ends, etc.

[0055] In one embodiment, as Figure 4 and Figure 5 , the roll body cooling structure includes an inner tank 13 provided inside the roll body 10 and enclosing a heat insulation zone with the inner wall of the roll body, and a flow guide 15 provided in the heat insulation zone. A cooling medium channel communicating with the heat insulation zone is provided on the drive side shaft head and / or the operating side shaft head.

[0056] Among them, the above cooling medium channel includes a medium supply channel and a medium return channel. By supplying a cooling medium into the heat insulation zone to take away the heat of the roll body 10, the cooling of the roll body 10 can be realized. Preferably, through the setting of the above flow guide 15, the cooling medium in the heat insulation zone is kept in a turbulent state, and this state can improve the heat exchange efficiency. In one embodiment, as Figure 5 , the above flow guide 15 adopts a spiral flow guide 15 to make the cooling medium flow spirally in the heat insulation zone; further preferably, the spiral angle α of the spiral flow guide 15 relative to the axis of the roll body 10 is 55 - 60°, which is beneficial to realizing the above turbulent state. In particular, the height h of the above heat insulation zone (that is, the distance between the inner tank 13 and the roll body 10) is in the range of 60 - 80 mm. When the cooling medium is cooling water, the Reynolds coefficient Re of the cooling water > 4000, and the cooling water in this state is basically in a turbulent state, so as to improve the heat exchange efficiency.

[0057] The spiral flow guide 15 can be fixed on the inner tank 13, or fixed on the roll body 10, or fixed to the inner tank 13 and the roll body 10 respectively.

[0058] The above inner tank 13 is preferably a closed hollow structure, which can not only reduce the weight of the tension roll 1, but also has a good heat insulation effect and can further extend the service life of the tension roll 1. Based on the multiple heat insulation structure of the roll body 10 - heat insulation zone - inner tank 13, coupling with the cooling effect in the heat insulation zone, it can greatly ensure that the heat of the roll body 10 will not be transferred to the roller bearings 113 at both ends of the shaft head 12, thereby extending the service life of the roll body 10, the shaft head 12 and the roller bearings 113.

[0059] In one of the embodiments, as Figures 4-6 , the above-mentioned medium supply channel includes a water inlet pipe 14, and the water inlet pipe 14 extends into the roll body 10 through the drive side shaft head or the operation side shaft head and communicates with the above-mentioned heat insulation belt; further, the water inlet pipe 14 penetrates through the inner tank 13, so that the installation of the inner tank 13 can be realized through the water inlet pipe 14, and at the same time, the layout of the water inlet pipe 14 is also facilitated.

[0060] Among them, preferably, there is a distance between the inner tank 13 and the two end shaft heads 12 and correspondingly an end heat insulation cavity is enclosed, and this distance can be the same as or different from the height of the heat insulation belt; the outlet end of the water inlet pipe 14 is preferably extended into one of the end heat insulation cavities, and the above-mentioned medium return channel is preferably communicated with the other end heat insulation cavity.

[0061] Optionally, as Figure 4 and Figure 5 , there is a gap between the water inlet pipe 14 and the inner wall of the corresponding side shaft head 12 to form the above-mentioned medium return channel, so that the intake and return water on the same side can facilitate the circulation management of the cooling water. Among them, a return water pipe is connected to the corresponding side shaft head 12, and the return water pipe is communicated with the above-mentioned medium return channel.

[0062] Embodiment 4

[0063] The embodiment of the present invention provides a tension roll 1, among which, the tension roll 1 can be used in the above-mentioned Embodiments 1 to 3.

[0064] As Figure 5 and Figure 6 , the above-mentioned tension roll 1 includes a roll body 10, a drive side shaft head and an operation side shaft head. A roll body cooling structure is arranged in the roll body 10, and roller bearings 113 and roller bearing seats 112 are assembled on both the drive side shaft head and the operation side shaft head.

[0065] In the structure where the tension roll bearing seat adopts a split bearing seat, the above-mentioned roller bearing seat 112 can correspondingly adopt the structural form of a bearing upper cover.

[0066] Preferably, at least one of the roller bearing seats 112 is a sealed bearing seat, and a limit shaft collar 114 and a sealing core shaft 15 are arranged on the side of the sealed bearing seat away from the roll body.

[0067] In one of the embodiments, as Figure 5 and Figure 6 , the limit shaft collar 114 is fixedly connected to the corresponding shaft head 12 and abuts against the sealed bearing seat; the limit shaft collar 114 can not only limit the axial displacement of the bearing seat 112 and the roller bearing 113, but also play a role in waterproofing and dustproofing.

[0068] Preferably, as Figure 5 andFigure 6 A first inner seal 165 is clamped between the limiting collar 114 and the corresponding shaft head 12. The first inner seal 165 includes, but is not limited to, a lip oil seal. Correspondingly, a sealing shaft shoulder can be machined on the shaft head 12 to facilitate clamping the first inner seal 165 in cooperation with the limiting collar 114.

[0069] In one embodiment, as Figure 5 and Figure 6 , the sealing mandrel 15 is fixedly connected to the corresponding shaft head 12. Further preferably, as Figure 5 and Figure 6 , the mounting end of the sealing mandrel 15 adopts a stepped shaft inner ring wall. The large-diameter section 151 of the stepped shaft inner ring wall is closer to the roll body 10 than its small-diameter section. Preferably, the stepped surface of the stepped shaft 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. Threads are machined on the above-mentioned large-diameter section 151 and are screwed into the annular threaded hole.

[0070] Optionally, fasteners such as long bolts can be used to further fixedly connect the sealing mandrel 15 and the corresponding shaft head 12. Taking the long bolt as an example, the long bolt passes through the stepped surface of the above-mentioned stepped shaft inner ring wall and the end face of the corresponding shaft head 12.

[0071] Further preferably, as Figure 5 and Figure 6 , a second inner seal 166 is provided between the outer wall of the sealing mandrel 15 and the large-diameter ring wall of the annular threaded hole. The second inner seal 166 includes, but is not limited to, a trapezoidal dust seal.

[0072] As Figure 5 and Figure 6 , preferably, there is a mandrel gap between the sealing mandrel 15 and the limiting collar 114.

[0073] Preferably, a water collecting tank 17 is formed in the mandrel gap. The medium return channel of the roll body cooling structure is communicated with the water collecting tank 17, and the water collecting tank 17 is communicated with the return water pipe. The return water with the increased water temperature enters the water collecting tank 17 through the communication of the medium return channel and then flows into the return water pipe.

[0074] Wherein, a water return port communicated with the above-mentioned water collecting tank 17 is correspondingly arranged on the sealing mandrel 15.

[0075] In one embodiment, as Figure 5 and Figure 6, in the mandrel clearance, at least one lip seal 167 is provided on each side of the water collecting tank 17. Based on this design, during the rotation of the tension roll 1, the return water can be prevented from entering the bearing housing 112 and long-lasting grease lubrication seal can be injected. Moreover, the contaminated grease can be directly discharged to the outside of the tension roll 1 through the water collecting tank 17.

[0076] Further preferably, as Figure 5 and Figure 6 , a plurality of lip seals 167 are provided on each side of the water collecting tank 17. Preferably, the lip seals 167 on both sides are symmetrically arranged with respect to the water collecting tank 17. For each lip seal 167 between the water collecting tank 17 and the roll body 10, preferably, taking the orientation of the roll body 10 relative to the water collecting tank 17 as the reference direction, among the lip seals 167 between the water collecting tank 17 and the roll body 10, the lip direction of the lip seal 167 closest to the water collecting tank 17 is opposite to this reference direction, and the lip directions of the remaining lip seals 167 are the same as this reference direction. For example, when the roll body 10 is located on the left side of the water collecting tank 17 (for example, when the corresponding shaft head 12 is the operating side shaft head), the lip seal 167 closest to the water collecting tank 17 is a right lip seal, and the rest are all left lip seals. Taking the example that there are four lip seals 167 on each side of the water collecting tank 17 from left to right, according to the lip direction, it forms an arrangement form of "left left left right + right left right right". This arrangement strategy of the lip seal 167 can greatly ensure that water does not enter the bearing housing 112, and while ensuring the grease lubrication lip seal, the excess grease can enter the bearing for lubrication, thereby improving the working reliability of the tension roll 1.

[0077] Further preferably, a water seal spacer 168 is provided between every two adjacent lip seals 167 on each side of the water collecting tank 17, which can preferably prevent the deformation of the lip seal.

[0078] Further preferably, in the above "left left left right + right left right right" lip seal 167 arrangement structure, the water seal spacers 168 are arranged from left to right according to the following strategy: 1 left-handed oil inlet water seal spacer - 1 left-handed water seal spacer - 1 through-core oil inlet water seal spacer - 1 through-core oil inlet water seal spacer - 1 right-handed water seal spacer - 1 right-handed oil inlet water seal spacer. This way forms a flexible water seal combination, which can obtain a better effect of preventing the deformation of the lip seal; among them, the left-handed oil inlet water seal spacer, the through-core oil inlet water seal spacer and the right-handed oil inlet water seal spacer not only play a role in preventing the deformation of the lip seal, but also are responsible for leading the grease to the surface of each lip seal, extending its service life.

[0079] Optionally, as Figure 5 and Figure 6, a mandrel end cap 115 is detachably connected to the outer end of the limit collar 114. Among them, the outermost lip seal 167 can be pressed by the mandrel end cap 115. An inlet and / or an outlet can be provided on the mandrel end cap 115 to facilitate the design of the inlet and outlet of the cooling water.

[0080] Further preferably, as Figure 5 and Figure 6 , a sealing structure is provided on one side of the sealed bearing housing close to the roll body 10.

[0081] In one embodiment, as Figure 5 and Figure 6 , the sealing structure includes a bearing skeleton oil seal 161, and the bearing skeleton oil seal 161 can be assembled to the bearing housing 112 through a split gland 162. Further, a waterproof cover 163 can be provided outside the split gland.

[0082] As Figure 5 and Figure 6 , a locking nut 164 can be screwed onto the corresponding shaft head 12, and the locking nut 164 abuts against the corresponding roller bearing 113, which can not only limit the axial displacement of the roller bearing 113, but also achieve a sealing effect.

[0083] Through the cooperation of various sealing structures on both sides of the sealed bearing housing, a multiple combined seal of protective seal + skeleton seal + lip seal + mechanical seal can be formed to ensure that the working environment of the roller bearing 113 is free of water and dust.

[0084] Embodiment 5

[0085] An embodiment of the present invention provides a furnace coil production line, including a coiling furnace, an inlet pinch roll and an outlet pinch roll. 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. Among them, at least one group of the tension roll devices adopts the tension roll device in the above-mentioned Embodiment 1 / Embodiment 2, or adopts the tension roll 1 in the above-mentioned Embodiment 3 / Embodiment 4.

[0086] Among them, preferably, the above-mentioned furnace coil production line is a production line that can perform both coil rolling and flat rolling.

[0087] Correspondingly, a production method of the above-mentioned furnace coil production line is also provided, including:

[0088] In the coil rolling production mode, the tension roll 1 adopts a passive rotation mode, and in the flat rolling production mode, the tension roll 1 adopts an active rotation mode.

[0089] In the flat rolling mode, the tension roll 1 rotates actively continuously, which can make the high temperature evenly distributed on the entire circumference of the tension roll 1 and effectively extend the service life of the tension roll 1.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tension roller with reliable operation, comprising a roller body, a transmission side shaft head and an operating side shaft head, wherein the transmission side shaft head and the operating side shaft head are both equipped with roller bearings and roller bearing seats, and a roller body cooling structure is provided in the roller body, characterized in that: At least one of the roller bearing seats is a sealed bearing seat, and a limiting collar and a sealing core shaft are provided on the side of the sealed bearing seat away from the roller body. The limiting collar is fixedly connected to the corresponding shaft head and is tightly pressed against the sealed bearing seat; the sealing core shaft is fixedly connected to the corresponding shaft head, and a core shaft gap is provided between the sealing core shaft and the limiting collar, a water collecting groove is formed in the core shaft gap, and at least one lip-shaped water seal is provided on both sides of the water collecting groove, and the medium reflux channel of the roller body cooling structure is connected to the water collecting groove.

2. The tension roller according to claim 1, characterized in that: A plurality of lip-shaped water seals are respectively arranged on both sides of the water collecting tank, and the lip-shaped water seals on both sides are arranged symmetrically relative to the water collecting tank.

3. The tension roller according to claim 2, characterized in that: Taking the position of the roller body relative to the water collecting tank as the reference direction, among the lip-shaped water seals between the water collecting tank and the roller body, the lip direction of the lip-shaped water seal closest to the water collecting tank is opposite to the reference direction, and the lip directions of the other lip-shaped water seals are the same as the reference direction.

4. The tension roller according to claim 3, characterized in that: The roller bearing seat on the operating side shaft head is a sealed bearing seat, wherein there are four lip-shaped water seals on the left and right sides of the water collecting tank, respectively. The position of the roller body relative to the water collecting tank is defined as the left side, and from left to right, the arrangement is formed in the direction of the lip shape in the form of "left-left-left-right + left-right-right".

5. The tension roller according to claim 4, characterized in that: A water seal is provided between two adjacent lip-shaped water seals on each side, and the water seals 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.

6. The tension roller according to claim 1, characterized in that: A plurality of lip-shaped water seals are respectively arranged on both sides of the water collecting tank, and a water seal partition is arranged between each two adjacent lip-shaped water seals on each side of the water collecting tank.

7. The tension roller according to claim 1, characterized in that: A first inner seal is sandwiched between the limiting collar and the corresponding shaft head.

8. The tension roller according to claim 1, characterized in that: The mounting end of the sealing core shaft adopts the inner ring wall of the stepped shaft, the large diameter section of the inner ring wall of the stepped shaft is closer to the roller body than the small diameter section, an annular threaded hole is processed on the corresponding shaft head end, and the large diameter section is processed with threads and is screwed to the annular threaded hole; a second inner seal is arranged between the outer wall of the sealing core shaft and the large diameter ring wall of the annular threaded hole.

9. The tension roller according to claim 1, characterized in that: A sealing structure is also provided on one side of the sealed bearing seat close to the roller body.

10. A furnace coil production line, comprising 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, characterized in that: At least one group of the tension roller devices adopts the tension roller according to any one of claims 1 to 9.

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