Winding drum hydraulic system, coiling machine and hot continuous rolling equipment

Abstract

The utility model provides a winding drum hydraulic system, a coiling machine and hot continuous rolling equipment, and relates to the technical field of hot continuous rolling, the winding drum hydraulic system is applied to the coiling machine, the coiling machine comprises a rotary communication joint, a winding drum collapsible cylinder and a rotary driving device, the drum hydraulic system comprises an oil inlet pipeline, an oil return branch, an oil discharge pipeline, a servo valve and a hydraulic station, the hydraulic station comprises a hydraulic station oil tank, a valve stand and a plunger pump, one end of the oil inlet pipeline and one end of the oil return branch are communicated with the plunger pump and the hydraulic station oil tank respectively, and the other end of the oil inlet pipeline and the other end of the oil return branch are communicated with the servo valve. The winding drum collapsible cylinder comprises a rod cavity and a rodless cavity, and the servo valve is communicated with the rod cavity and the rodless cavity of the winding drum collapsible cylinder through the rotary communication joint; the rotary communication joint is provided with an oil discharge port which is communicated with a hydraulic station oil tank through an oil discharge pipeline. The rotary communication joint can be effectively prevented from being damaged by overhigh pressure of an oil drainage pipeline in the prior art, and the normal work of a drum hydraulic system is correspondingly ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hot continuous rolling, and in particular, to a mandrel hydraulic system, a coiler and a hot continuous rolling device. Background Art

[0002] During the coiling operation of the hot continuous rolling device, the coiler winds the rolled strip into a steel coil. For example, the coiler mainly includes a rotary drive device, a coiling roll, a mandrel, a mandrel expansion and contraction cylinder, a rotary joint and a mandrel hydraulic system. When coiling the strip, the mandrel is in a pre-expanded diameter state, and the strip can be wound on the mandrel with the assistance of the coiling roll. After the strip is wound for at least one turn, the mandrel expansion and contraction cylinder is controlled by the mandrel hydraulic system to cause the mandrel to expand in diameter again. Subsequently, the coiling roll starts to perform stepping control, and during the entire process of winding the strip on the mandrel, the mandrel can be driven to rotate by the rotary drive device, thereby realizing the coiling operation of the strip.

[0003] In the related art, the rotary joint is a key component for realizing the expansion and contraction of the mandrel, and is usually arranged at the rotary drive device. Its main function is to deliver pressure oil to the mandrel expansion and contraction cylinder to cause the mandrel to perform diameter expansion and contraction actions. Among them, the mandrel hydraulic system mainly includes an oil discharge pipeline, a plurality of oil return branch pipes and an oil return main pipe. The two ends of an oil return branch pipe are respectively communicated with the mandrel expansion and contraction cylinder and the oil return main pipe, and a plurality of oil return branch pipes of other hydraulic devices of the coiler, such as coiling rolls, movable supports, fork cylinders, etc., are communicated with the oil return main pipe; one end of the oil discharge pipeline is communicated with the oil discharge port of the rotary joint, and the other end is communicated with the oil return main pipe; among them, the oil return main pipe is communicated with the hydraulic station oil tank.

[0004] Since the oil discharge pipeline of the rotary joint is communicated with the oil return main pipe, the hydraulic oil in the rotary joint needs to be depressurized through the oil discharge pipeline and then through the oil return main pipe. However, due to the hydraulic oil with a certain pressure in the oil return main pipe, the oil pressure in the oil discharge pipeline rises sharply, thereby affecting the service life of the components of the rotary joint, such as the skeleton oil seal. Summary of the Utility Model

[0005] The problem solved by the utility model is how to avoid excessive oil pressure in the oil discharge pipeline communicating with the rotary joint in the mandrel hydraulic system, so as to damage the rotary joint.

[0006] To solve the above problems, the utility model provides a mandrel hydraulic system, a coiler and a hot continuous rolling device.

[0007] In a first aspect, the present utility model provides a drum hydraulic system applied to a coiler. The coiler includes a rotary joint, a drum expansion and contraction cylinder, and a rotary drive device. The rotary joint is arranged at the rotary drive device. The drum hydraulic system includes an oil inlet pipeline, an oil return branch, an oil discharge pipeline, a servo valve, and a hydraulic station. The hydraulic station includes a hydraulic station oil tank, a valve platform, and a piston pump. The piston pump is connected to the hydraulic station oil tank through the valve platform. One end of the oil inlet pipeline is connected to the piston pump through the valve platform. One end of the oil return branch is connected to the hydraulic station oil tank through the valve platform. The other ends of the oil inlet pipeline and the oil return branch are connected to the servo valve. The drum expansion and contraction cylinder includes a rod chamber and a rodless chamber. The servo valve is connected to the rod chamber and the rodless chamber of the drum expansion and contraction cylinder through the rotary joint;

[0008] The rotary joint is provided with an oil discharge port, and the oil discharge port is connected to the hydraulic station oil tank through the oil discharge pipeline.

[0009] Optionally, the rotary joint has a first flow channel and a second flow channel. Two ports of the first flow channel are respectively connected to the servo valve and the rod chamber, and two ports of the second flow channel are respectively connected to the servo valve and the rodless chamber.

[0010] Optionally, the rotary drive device includes a drive motor and a speed reducer. The drive motor is drivingly connected to the speed reducer for driving the speed reducer to rotate. The rotary joint includes a housing, a core shaft structure, and two chucks. The core shaft structure is drivingly connected to the speed reducer. The two chucks are arranged along the axial direction of the core shaft structure and sleeved on the core shaft structure, and the housing is sleeved outside the core shaft structure and the chucks.

[0011] Optionally, the rotary joint further includes a skeleton oil seal, and the skeleton oil seal is arranged at the connection between the core shaft structure and the housing.

[0012] Optionally, the rotary joint includes a bearing. The inner ring of the bearing is sleeved outside the core shaft structure, and the bearing is located between the chuck and the axial end of the housing.

[0013] Optionally, the drum hydraulic system further includes a check valve, and the check valve is arranged on the oil return branch between the valve platform and the servo valve.

[0014] Optionally, the check valve includes a valve block and a valve core. The inside of the valve block has a receiving cavity. The valve core is detachably installed in the receiving cavity of the valve block. The valve block is provided with an oil inlet and an oil outlet. The servo valve is connected to the oil inlet. Two ends of the valve core are respectively correspondingly connected to the oil inlet and the oil outlet, and the oil outlet is connected to the hydraulic station oil tank through the valve platform; the opening pressure of the valve block is greater than or equal to the opening pressure of the valve core.

[0015] Optionally, the one-way valve further includes a plug. At least one end of the valve block along the axial direction of the valve core is provided with an installation opening. The valve core is used to be installed in the accommodation cavity from the installation opening, and the plug is hermetically connected to the installation opening.

[0016] In a second aspect, the present utility model provides a coiler, which includes the above-mentioned reel hydraulic system, and further includes a reel and a reel expansion and contraction cylinder. The reel expansion and contraction cylinder is connected to the reel and is used to drive the reel to perform expansion and contraction actions.

[0017] In a third aspect, the present utility model provides a hot continuous rolling equipment, which includes the coiler as described above.

[0018] The beneficial effects of the reel hydraulic system, the coiler and the hot continuous rolling equipment of the present utility model are as follows: The reel expansion and contraction cylinder can be connected to the reel and is used to drive the reel to contract or expand; the reel expansion and contraction cylinder can work in the following manner. For example, when the reel expansion and contraction cylinder drives the reel to contract, first control the servo valve to switch to the first position, so that the plunger pump of the hydraulic station works to pump hydraulic oil from the hydraulic station oil tank to the valve platform. Subsequently, the hydraulic oil enters the rodless cavity of the reel expansion and contraction cylinder along the oil inlet pipeline through the servo valve and the rotary joint, and is discharged from the rod cavity through the servo valve and flows back to the hydraulic station oil tank along the oil return branch through the valve platform, so as to push the piston of the reel expansion and contraction cylinder to move in one direction to drive the reel to contract; when the reel expansion and contraction cylinder drives the reel to expand, first control the servo valve to switch to the second position, so that the plunger pump of the hydraulic station works to pump hydraulic oil from the hydraulic station oil tank to the valve platform. Subsequently, the hydraulic oil enters the rod cavity of the reel expansion and contraction cylinder along the oil inlet pipeline through the servo valve and the rotary joint, and is discharged from the rodless cavity through the servo valve and flows back to the hydraulic station oil tank along the oil return branch through the valve platform, so as to push the piston of the reel expansion and contraction cylinder to move in the other direction to drive the reel to perform expansion operation; wherein, one direction and the other direction are two opposite directions.

[0019] When the reel is working, since the oil discharge port of the rotary joint is connected to the hydraulic station oil tank through the oil discharge pipeline, the hydraulic oil in the reel expansion and contraction cylinder can flow back to the hydraulic station oil tank through the oil discharge port of the bearing in the rotary joint through the oil discharge pipeline, so that the pressure of the oil discharge pipeline is close to 0 bar. At this time, the internal oil pressure of the rotary joint is effectively reduced, thereby effectively avoiding damage to the rotary joint due to too high pressure of the oil discharge pipeline in the prior art, and correspondingly ensuring the normal operation of the reel hydraulic system. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the pipeline structure of the coiler in the related art.

[0021] Figure 2 It is a schematic diagram of the pipeline structure of the coiler in the embodiment of the present utility model.

[0022] Figure 3 This is a schematic cross-sectional structure diagram of the rotary connection joint in the embodiment of the present utility model.

[0023] Figure 4 This is a schematic cross-sectional structure diagram of the one-way valve in the embodiment of the present utility model.

[0024] Explanation of reference numerals in the drawings:

[0025] 1'-Drum expansion and contraction cylinder; 2'-Rotary connection joint; 3'-Return oil branch pipe; 4'-Return oil main pipe; 5'-Oil discharge pipeline; 6'-One-way valve;

[0026] 1-Drum expansion and contraction cylinder; 2-Rotary connection joint; 201-First flow channel; 202-Second flow channel; 21-Housing; 22-Spindle structure; 23-Chuck; 24-Skeleton oil seal; 25-Bearing; 3-Return oil branch; 4-Inlet oil pipeline; 5-Oil discharge pipeline; 6-Hydraulic station oil tank; 7-One-way valve; 71-Valve block; 711-Inlet port; 712-Outlet port; 72-Valve core; 73-Plug; 8-Servo valve; 9-Valve platform. Detailed implementation manners

[0027] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0028] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order or mutual dependence relationship of the functions performed by these devices, modules, or units.

[0029] It should be noted that the modifications of "one" and "multiple" mentioned in the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0030] In the related art, the coiling operation of hot continuous rolling equipment is to coil the rolled strip into a steel coil by a coiler. For example, the coiler mainly includes a rotary drive device, a coiling roll, a mandrel, a mandrel expansion and contraction cylinder, a rotary joint, and a mandrel hydraulic system. When the strip is coiled, the mandrel is in a pre-expanded diameter state, and the strip can be coiled on the mandrel with the assistance of the coiling roll. After the strip is coiled at least one turn, the mandrel expansion and contraction cylinder is controlled by the mandrel hydraulic system to make the mandrel expand in diameter again. Subsequently, the coiling roll starts to perform stepping control, and during the whole process of the strip being coiled on the mandrel, the mandrel can be driven to rotate by the rotary drive device, so that the coiling operation of the strip can be realized.

[0031] In the related art, the rotary joint 2' is a key component for realizing the expansion and contraction of the mandrel. It is usually arranged at the rotary drive device, and its main function is to convey pressure oil to the mandrel expansion and contraction cylinder 1' to make the mandrel perform diameter expansion and contraction actions. Among them, in combination with Figure 1 As shown, the mandrel hydraulic system mainly includes an oil discharge pipeline 5', a plurality of oil return branch pipes 3', and an oil return main pipe 4'. Both ends of an oil return branch pipe 3' are respectively connected to the mandrel expansion and contraction cylinder 1' and the oil return main pipe. A plurality of oil return branch pipes 3' corresponding to other hydraulic devices of the coiler, such as coiling rolls, movable supports, fork cylinders, etc., can be connected to the oil return main pipe 4'; one end of the oil discharge pipeline 5' is connected to the oil discharge port of the rotary joint 2', and the other end is connected to the oil return main pipe 4'.

[0032] Since the oil discharge pipeline 5' of the rotary joint 2' is connected to the oil return main pipe 4', the hydraulic oil in the rotary joint 2' needs to be depressurized through the oil discharge pipeline 5' and the oil return main pipe 4'. However, due to the hydraulic oil with a certain pressure in the oil return main pipe 4' and the small diameter of the oil discharge pipeline 5' (for example, it is Φ20X3, indicating that the outer diameter of the oil discharge pipeline 5' is 20 mm and the wall thickness is 3 mm), the oil pressure of the oil discharge pipeline 5' rises sharply, thus affecting the service life of the components of the rotary joint 2', such as the skeleton oil seal.

[0033] In view of the problems existing in the above related art, this embodiment provides a mandrel hydraulic system, a coiler, and a hot continuous rolling equipment.

[0034] As Figure 2As shown in the figure, a drum hydraulic system provided by an embodiment of the present utility model is applied to a coiler. The coiler includes a rotary connecting joint 2, a drum expansion and contraction cylinder 1, and a rotary driving device. The rotary connecting joint 2 is arranged at the rotary driving device. The drum hydraulic system includes an oil inlet pipeline 4, an oil return branch 3, an oil discharge pipeline 5, a servo valve 8, and a hydraulic station. The hydraulic station includes a hydraulic station oil tank 6, a valve platform 9, and a piston pump. The piston pump is connected to the hydraulic station oil tank 6 through the valve platform 9. One end of the oil inlet pipeline 4 is connected to the piston pump through the valve platform 9. One end of the oil return branch 3 is connected to the hydraulic station oil tank 6 through the valve platform 9. The other ends of the oil inlet pipeline 4 and the oil return branch 3 are connected to the servo valve 8. The drum expansion and contraction cylinder 1 includes a rod chamber and a rodless chamber. The servo valve 8 is connected to the rod chamber and the rodless chamber of the drum expansion and contraction cylinder 1 through the rotary connecting joint 2;

[0035] The rotary connecting joint 2 is provided with an oil discharge port, and the oil discharge port is connected to the hydraulic station oil tank 6 through the oil discharge pipeline 5.

[0036] Specifically, the hydraulic station may include a hydraulic station oil tank 6, a valve platform 9, and a piston pump. The piston pump is connected to the hydraulic station oil tank 6 through the valve platform 9. The piston pump is used to pump the hydraulic oil in the hydraulic oil tank. The valve platform 9 can be connected to the servo valve 8 through two oil pipes (the oil inlet pipeline 4 and the oil return branch 3). The servo valve 8 is connected to the rod chamber and the rodless chamber of the drum expansion and contraction cylinder 1. The servo valve 8 is used to change the flow direction of the hydraulic oil in the oil inlet pipeline 4 to control the supply of the hydraulic oil in the oil inlet pipeline 4 to the rod chamber or the rodless chamber.

[0037] Figure 2 In the figure, MP at the hydraulic station is the pressure measuring joint of the oil inlet port, MT is the pressure measuring joint of the oil return port, MX is the pressure measuring joint of the control oil port, and MY is the oil discharge pipe interface pressure measuring joint.

[0038] Figure 2 In the figure, the pipeline between the MP port of the valve platform 9 and the servo valve 8 can be defined as the oil inlet pipeline 4, and the pipeline between the servo valve 8 and the MT port of the valve platform 9 can be defined as the oil return branch 3.

[0039] Among them, the drum expansion and contraction cylinder 1 includes a cylinder body and a piston rod. There are two cavities in the cylinder body. Among them, the cavity with the piston rod extending out of the cylinder body is the rod chamber, and the cavity without the piston rod extending out of the cylinder body is the rodless chamber.

[0040] The servo valve 8 can be a three-position four-way servo valve, and the model can be D663-4007 / L03HABD6VSX2-A.

[0041] In this embodiment, the drum expansion and contraction cylinder 1 can be connected to the drum and is used to drive the drum to contract or expand. The drum expansion and contraction cylinder 1 can work in the following manner. For example, when the drum expansion and contraction cylinder 1 drives the drum to contract, first control the servo valve 8 to switch to the first position, so that the plunger pump of the hydraulic station pumps hydraulic oil from the hydraulic station oil tank 6 to the valve platform 9. Subsequently, the hydraulic oil enters the rodless cavity of the drum expansion and contraction cylinder 1 along the oil inlet pipeline 4 through the servo valve 8 and the rotary joint 2, and is discharged from the rod cavity through the servo valve 8 and flows back to the hydraulic station oil tank 6 along the oil return branch 3 through the valve platform, so as to push the piston of the drum expansion and contraction cylinder 1 to move in one direction to drive the drum to contract. When the drum expansion and contraction cylinder 1 drives the drum to expand, first control the servo valve 8 to switch to the second position, so that the plunger pump of the hydraulic station pumps hydraulic oil from the hydraulic station oil tank 6 to the valve platform 9. Subsequently, the hydraulic oil enters the rod cavity of the drum expansion and contraction cylinder 1 along the oil inlet pipeline 4 through the servo valve 8 and the rotary joint 2, and is discharged from the rodless cavity through the servo valve 8 and flows back to the hydraulic station oil tank 6 along the oil return branch 3 through the valve platform 9, so as to push the piston of the drum expansion and contraction cylinder 1 to move in the other direction to drive the drum to perform an expansion operation. Wherein, one direction and the other direction are two opposite directions.

[0042] When the drum is working, since the oil discharge port of the rotary joint 2 is connected to the hydraulic station oil tank 6 through the oil discharge pipeline 5, the hydraulic oil in the drum expansion and contraction cylinder 1 can flow back to the hydraulic station oil tank 6 through the oil discharge port of the rotary joint 2 via the oil discharge pipeline 5, so that the pressure of the oil discharge pipeline is close to 0 bar. At this time, the internal oil pressure of the rotary joint 2 is effectively reduced, thus effectively avoiding damage to the rotary joint 2 due to excessive pressure in the oil discharge pipeline in the prior art, and correspondingly ensuring the normal operation of the drum hydraulic system.

[0043] Furthermore, the existing oil discharge pipeline 5 with a specification of Φ20X3 can be replaced with a specification of Φ28X3 to reduce the pressure of the hydraulic oil in the oil discharge pipeline 5 by increasing the diameter of the oil discharge pipeline 5, and correspondingly reduce the possibility that the skeleton oil seal 24 of the rotary joint 2 is broken by high oil pressure, thereby correspondingly extending the service life of the rotary joint 2.

[0044] The maximum pressure of the oil discharge pipeline 5 shall not exceed 0.2 bar, and the above-mentioned outer diameter selection and frictional resistance along the way of the oil discharge pipeline 5 can be calculated in the following manner.

[0045] For example, the oil discharge pipeline diameter and calculation: The oil port thread of the oil discharge pipeline is G1”, the corresponding standard pipeline diameter is DN25, and the pipeline size corresponding to the light series is (pipe outer diameter 28 mm, wall thickness 3 mm), that is, the inner diameter of the oil discharge pipeline

[0046] The normal leakage rate of M200NX2 at 130 bar pressure is 2.6 - 3.4 L / min. Considering that the leakage rate will increase correspondingly with the increase of service time, the maximum leakage rate is considered according to twice the normal leakage rate, that is, 6.8 L / min. Principle for calculating the frictional resistance along the pipeline: The horizontal length of the pipeline is 20 meters without height difference. Without considering the local resistance caused by pipeline bending and diameter change, etc., the pressure difference at the starting and ending ends of the pipeline is 0.2 bar, the flow rate is 6.8 L / min, and the hydraulic oil is No. 46.

[0047] Calculation of frictional resistance along the way: Since the oil flow velocity in the oil discharge pipeline is relatively low, it can be considered as laminar flow ΔP = 128μLq / (πd4),

[0048] where the viscosity μ = 0.039 Ns / m 2 ; the length of the oil discharge pipeline L = 20 m; the flow rate Q = 6.8 L / min = 6.8 / 60 / 1000 = 0.00011 m3 / s;

[0049] V (flow velocity) = q / A = 0.00011×4 / 3.14 / 0.0222 = 0.29 m / s; d (inner diameter of the pipeline) = 0.022 m,

[0050] So ΔP (frictional resistance along the way) = 128×0.039×20×0.00011 / 3.14 / 0.0224 = 0.149 bar.

[0051] ΔP = 0.149 bar is less than 0.2 bar, meeting the requirements. Therefore, the oil discharge pipeline 5 with an inner diameter of 22 mm can be selected and connected to the hydraulic station oil tank 6 on site. The oil discharge pipeline 5 with an inner diameter of 22 mm can be selected and connected to the hydraulic station oil tank 6 on site.

[0052] Optionally, as shown in Figure 3 the rotary union 2 has a first flow channel 201 and a second flow channel 202. The two ports of the first flow channel 201 are respectively communicated with the servo valve 8 and the rod chamber, and the two ports of the second flow channel 202 are respectively communicated with the servo valve 8 and the rodless chamber.

[0053] Specifically, the rotary union 2 has two flow channels, namely the first flow channel 201 and the second flow channel 202. One end of the first flow channel 201 is communicated with the servo valve 8, and the other end is communicated with the rod chamber of the reel expansion and contraction cylinder 1; one end of the second flow channel 202 is communicated with the servo valve 8, and the other end is communicated with the rodless chamber of the reel expansion and contraction cylinder 1.

[0054] In this optional embodiment, since the rotary union 2 has the first flow channel 201 and the second flow channel 202, it can play a role in connecting the servo valve 8 with the rod chamber and the rodless chamber of the reel expansion and contraction cylinder 1.

[0055] Optionally, as shown inFigure 3 As shown, the rotary drive device includes a drive motor and a speed reducer, the drive motor is drivingly connected to the speed reducer for driving the speed reducer to rotate; the rotary joint 2 includes a housing 21, a core shaft structure 22 and two chucks 23, the core shaft structure 22 is drivingly connected to the speed reducer, the two chucks 23 are arranged along the axial direction of the core shaft structure 22 and sleeved on the core shaft structure 22, and the housing 21 is sleeved outside the core shaft structure 22 and the chucks 23.

[0056] Specifically, the speed reducer can be connected to the drum. The speed reducer is used to increase the rotational torque of the drum by reducing the speed of the drive motor. For example, the drive motor operates to drive the drum to rotate through the speed reducer, and the coiling speed of the strip steel by the drum can be controlled at high and low speeds by the drive motor and the speed reducer.

[0057] The core shaft structure 22 of the rotary joint 2 is drivingly connected to the speed reducer so that the speed reducer can drive the core shaft structure 22 to rotate relative to the housing 21 and the chucks 23. Specifically, the core shaft structure 22 can be fixedly connected to the rotating shaft of the speed reducer through a flange.

[0058] The two chucks 23 can be arranged along the axial direction of the core shaft structure 22 and sleeved on the core shaft structure 22 for clamping or loosening the core shaft structure 22 under the action of air passage or hydraulic oil. The housing 21 is sleeved outside the core shaft structure 22 and the two chucks 23 for providing safety protection for the chucks 23 from the outside.

[0059] Optionally, as shown in Figure 3 the rotary joint 2 further includes a skeleton oil seal 24, and the skeleton oil seal 24 is arranged at the connection between the core shaft structure 22 and the housing 21.

[0060] Specifically, the number of the skeleton oil seals 24 can be two. For example, the skeleton oil seals 24 are respectively arranged at the connections between the two axial ends of the housing 21 along the core shaft structure 22 and the core shaft structure 22.

[0061] In this optional embodiment, by arranging the skeleton oil seal 24 at the connection between the core shaft structure 22 and the housing 21, the connection between the housing 21 and the core shaft structure 22 can be sealed by the skeleton oil seal 24 to prevent oil leakage problems of the rotary joint 2 and prevent external dust from entering the interior of the housing 21 from the connection between the housing 21 and the core shaft structure 22.

[0062] Optionally, as shown in Figure 3 the rotary joint 2 includes a bearing 25, the inner ring of the bearing 25 is sleeved outside the core shaft structure 22, and the bearing 25 is located between the axial ends of the chuck 23 and the housing 21.

[0063] Specifically, the rotary connecting section 2 may include two bearings 25. The bearings 25 are arranged between the axial two ends of the housing 21 and the corresponding chucks 23 along the axial direction of the mandrel structure 22, and the bearings 25 are sleeved outside the mandrel structure 22.

[0064] In this alternative embodiment, by sleeving the bearings 25 outside the mandrel structure 22 and the bearings 25 are between the axial two ends of the chuck 23 and the housing 21, not only the rotational smoothness of the mandrel structure 22 relative to the housing 21 is improved, but also the rotational stability of the mandrel structure 22 can be improved by the two bearings 25 distributed at intervals along the axial direction of the mandrel structure 22.

[0065] Optionally, in combination with Figure 2 As shown, the drum hydraulic system further includes a one-way valve 7, and the one-way valve 7 is arranged on the oil return branch 3 between the valve platform 9 and the servo valve 8.

[0066] Specifically, the one-way valve 7 is also called a check valve or a non-return valve, and is used to prevent the reverse flow of hydraulic oil in the hydraulic system.

[0067] In this alternative embodiment, the one-way valve 7 is arranged on the oil return branch 3 between the valve platform 9 and the servo valve 8, so as to utilize the one-way conduction characteristic of the one-way valve 7, so that the hydraulic oil discharged from a certain chamber (rod chamber or rodless chamber) of the drum expansion and contraction cylinder 1 flows back to the hydraulic station oil tank 6 through the servo valve 8 along the oil return branch 3 and through the valve platform 9, so that the floating pressure of the rotary connecting section 2 can be effectively maintained through the one-way valve 7, and abnormal wear of the chuck will not be caused, and the normal operation of the chuck is protected.

[0068] In the related art, in combination with Figure 1 As shown, a one-way valve 6' is also arranged on the oil return branch. The one-way valve 6' can be an RVP40 plate type one-way valve 6', and the opening pressure is only 0.5 bar. When the drum is performing the operation of coiling steel, the servo valve supplies oil to the P1 port of the rotary connecting section 2', so that the drum expands to coil the steel. At this time, the chuck at the P1 port floats, and the P2 port needs back pressure to ensure floating. However, since the pressure at the oil return port of the rotary connecting section 2' is lower than 5 bar or even has no back pressure, the floating requirement of the chuck cannot be satisfied. In other words, the back pressure valve in the drum hydraulic system, that is, the one-way valve 6' block, needs to have sufficient back pressure to open, so as to ensure that the chuck of the rotary connecting section 2' is in a floating state. If the back pressure is insufficient, abnormal wear of the chuck of the rotary connecting section 2' will occur, the service life will be insufficient, the leakage amount will increase, the oil discharge pipeline cannot timely discharge the hydraulic oil back to the system, and the skeleton oil seal of the rotary connecting section 2' will also leak oil due to insufficient pressure bearing.

[0069] Therefore, the present utility model improves the structure of the one-way valve in the above-mentioned prior art. For example, in combination with Figure 4As shown, the check valve 7 includes a valve block 71 and a valve core 72. The interior of the valve block 71 has a receiving cavity, and the valve core 72 is detachably installed in the receiving cavity of the valve block 71. The valve block 71 is provided with an oil inlet 711 and an oil outlet 712. The servo valve 8 is connected to the oil inlet 711. The two ends of the valve core 72 are respectively and correspondingly connected to the oil inlet 711 and the oil outlet 712. The oil outlet is connected to the hydraulic station oil tank 6 through the valve platform 9; the opening pressure of the valve block 71 is greater than or equal to the opening pressure of the valve core 72.

[0070] Specifically, according to the installation dimensions of the check valve 7, the structure of the check valve 7 is redesigned. For example, the valve block 71 with an opening pressure greater than or equal to 5 bar is replaced, and the valve core 72 is detachably installed in the receiving cavity of the valve block 71. The valve core 72 is a cartridge valve core, and for example, the model can be M-SR30KE50-1X. The maximum working pressure of the valve core 72 is 345 bar, and the opening pressure is 5 bar, so that the pressure in the low-pressure passage during coiling and uncoiling is in bar, to ensure the establishment of a good oil film for the floating of the chuck 23 of the rotary union 2, and correspondingly extend the service life of the rotary union 2.

[0071] When the valve core 72 is installed in the valve block 71, the two ends of the valve core 72 can be respectively and correspondingly connected to the oil inlet 711 and the oil outlet 712 of the valve block 71. The hydraulic oil in the oil return branch 3 can flow in the following way. For example, the hydraulic oil discharged from the rod chamber or the non-rod chamber of the reel expansion and contraction cylinder 1, after passing through the servo valve 8, flows along the oil return branch 3. When flowing through the check valve 7, it successively passes through the oil inlet 711, the valve core 72, the oil outlet 712, and the MT port of the valve platform 9 and then flows back into the hydraulic station oil tank 6.

[0072] Optionally, in combination with Figure 4 As shown, the check valve 7 further includes a plug 73. The valve block 71 is provided with an installation opening at at least one end along the axial direction of the valve core 72. The valve core 72 is installed in the receiving cavity from the installation opening, and the plug 73 is hermetically connected to the installation opening.

[0073] Specifically, the valve core 72 can be installed in the valve block 71 in the following way. For example, an installation opening is provided at at least one end of the valve block 71 in the axial direction, then the whole valve core 72 is inserted into the receiving cavity of the valve block 71, and then the plug 73 is hermetically connected to the corresponding installation opening to realize the encapsulation of the valve core 72 inside the valve block 71.

[0074] In this optional embodiment, since the valve core 72 can be installed in the receiving cavity of the valve block 71 from the installation opening of the valve block 71 and sealed by the plug 73, it is beneficial to the replacement and maintenance operations of the valve block 71 and the valve core 72 during the maintenance process of the rotary union 2.

[0075] A coiler provided by an embodiment of the present utility model includes a drum hydraulic system as described in the above embodiment, and further includes a drum and a drum expansion and contraction cylinder 1. The drum expansion and contraction cylinder 1 is connected to the drum and is used to drive the drum to perform expansion and contraction actions.

[0076] The coiler in this embodiment further includes a rotary drive device. The rotary drive device includes a drive motor and a speed reducer. Among them, the speed reducer can be connected to the drum to drive the drum to rotate, while the drum expansion and contraction cylinder 1 is connected to the drum to drive the drum to expand and contract. Since the connection between the drum expansion and contraction cylinder 1 and the drum, and the connection of the speed reducer to the drum are prior arts, no specific description will be made here.

[0077] The coiler can adopt the following working principle. For example, when coiling strip steel, the rotation of the drum is driven by the drive motor, which drives the speed reducer through the coupling to drive the drum to rotate. The coiling speed can be controlled at high and low speeds by the motor and the speed reducer. During pre-expansion of the diameter, the drum hydraulic control uses a servo valve 8 to control the position feedback of the drum expansion and contraction cylinder 1 and the ultrasonic sensor to control and realize the pre-expansion of the drum, so that the rod side and plug side pressures of the drum expansion and contraction cylinder 1 reach balance. After the strip steel enters the drum for 1 - 2 turns, the drum is re-expanded. At this time, the maximum pressure on the rod side of the drum expansion and contraction cylinder 1 is about 100 bar. The return oil pressure on the plug side of the drum expansion and contraction cylinder 1 is determined by the opening pressure of the valve core 72 of the check valve 7. At this time, the pressure oil on the plug side of the drum expansion and contraction cylinder 1 enters the oil inlet 711 of the valve block 71 of the check valve 7 through the return oil of the servo valve 8. After the valve core 72 of the check valve 7 (M-SR30) with a pressure greater than 5 bar is opened, it returns to the T port of the drum hydraulic system from the oil outlet 712 of the valve block 71. Ensure that the back pressure in the oil circuit on the plug side of the drum expansion and contraction cylinder 1 is not less than 5 bar during operation, so that the rotary joint 2 has a back pressure of 5 bar, making the core components of the rotary joint 2, such as the chuck 23, in a floating normal operation state. After the strip steel coiling is completed, the servo valve 8 controls the drum expansion and contraction cylinder 1 to retract the drum to the minimum expanded diameter, and the coiled steel is unloaded by the uncoiling trolley device. During this process, the back pressure of the rotary joint 2 is not less than 5 bar.

[0078] The beneficial effects of the coiler in this embodiment compared with the prior art are the same as those of the above drum hydraulic system, and will not be elaborated here.

[0079] A hot continuous rolling equipment provided by an embodiment of the present utility model includes a coiler as described in the above embodiment.

[0080] The beneficial effects of the hot continuous rolling equipment in this embodiment compared with the prior art are the same as those of the above coiler, and will not be elaborated here.

[0081] Although the present utility model is disclosed as above, the scope of protection of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the scope of protection of the present utility model.

Claims

1. A drum hydraulic system is applied to a coiler. The coiler includes a rotary connecting joint (2), a drum expansion and contraction cylinder (1), and a rotary driving device. The rotary connecting joint (2) is arranged at the rotary driving device. It is characterized in that, The drum hydraulic system includes an oil inlet pipeline (4), an oil return branch (3), an oil discharge pipeline (5), a servo valve (8), and a hydraulic station ， The hydraulic station includes a hydraulic station oil tank (6), a valve platform (9), and a piston pump. The piston pump is connected to the hydraulic station oil tank (6) through the valve platform (9). One end of the oil inlet pipeline (4) is connected to the piston pump through the valve platform (9). One end of the oil return branch (3) is connected to the hydraulic station oil tank (6) through the valve platform (9). The other ends of the oil inlet pipeline (4) and the oil return branch (3) are connected to the servo valve (8). The drum expansion and contraction cylinder (1) includes a rod chamber and a rodless chamber. The servo valve (8) is connected to the rod chamber and the rodless chamber of the drum expansion and contraction cylinder (1) through the rotary connection joint (2); The rotary connecting joint (2) is provided with an oil unloading port, and the oil unloading port is communicated with the hydraulic station oil tank (6) through the oil unloading pipeline (5).

2. The drum hydraulic system according to claim 1, characterized in that, The rotary connecting joint (2) has a first flow channel (201) and a second flow channel (202). Two ports of the first flow channel (201) are respectively communicated with the servo valve (8) and the rod chamber, and two ports of the second flow channel (202) are respectively communicated with the servo valve (8) and the rodless chamber.

3. The drum hydraulic system according to claim 1, characterized in that, The rotary driving device includes a driving motor and a speed reducer. The driving motor is drivingly connected to the speed reducer for driving the speed reducer to rotate. The rotary connecting joint (2) includes a housing (21), a core shaft structure (22) and two chucks (23). The core shaft structure (22) is in transmission connection with the speed reducer. The two chucks (23) are arranged along the axial direction of the core shaft structure (22) and sleeved on the core shaft structure (22), and the housing (21) is sleeved outside the core shaft structure (22) and the chucks (23).

4. The drum hydraulic system according to claim 3, characterized in that, The rotary connecting joint (2) further includes a skeleton oil seal (24), and the skeleton oil seal (24) is arranged at the connection between the core shaft structure (22) and the housing (21).

5. The drum hydraulic system according to claim 3, characterized in that, The rotary connecting joint (2) includes a bearing (25). The inner ring of the bearing (25) is sleeved outside the core shaft structure (22), and the bearing (25) is located between the axial ends of the chuck (23) and the housing (21).

6. The drum hydraulic system according to any one of claims 1 to 5, characterized in that, It further includes a check valve (7), and the check valve (7) is arranged on the oil return branch (3) between the valve platform (9) and the servo valve (8).

7. The drum hydraulic system according to claim 6, characterized in that, The check valve (7) includes a valve block (71) and a valve core (72). The interior of the valve block (71) has a receiving cavity. The valve core (72) is detachably installed in the receiving cavity of the valve block (71). The valve block (71) is provided with an oil inlet (711) and an oil outlet (712). The servo valve (8) is communicated with the oil inlet (711). Two ends of the valve core (72) are respectively correspondingly communicated with the oil inlet (711) and the oil outlet (712), and the oil outlet is communicated with the hydraulic station oil tank (6) through the valve platform (9); the opening pressure of the valve block (71) is greater than or equal to the opening pressure of the valve core (72).

8. The drum hydraulic system according to claim 7, wherein The check valve (7) further includes a plug (73). The valve block (71) is provided with an installation opening at at least one end along the axial direction of the valve core (72). The valve core (72) is used to be installed in the receiving cavity from the installation opening, and the plug (73) is hermetically connected to the installation opening.

9. A coiler, characterized in that, It includes the drum hydraulic system according to any one of claims 1 to 8, and further includes a drum and a drum expansion and contraction cylinder (1). The drum expansion and contraction cylinder (1) is connected to the drum for driving the drum to perform expansion and contraction actions.

10. A hot continuous rolling equipment, characterized in that, It includes the coiler according to claim 9.

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