Pressure-variable pinch roll hydraulic control system
By designing a hydraulic control system for variable pressure pinch rollers and using two hydraulic control systems to switch working pressure, the problem that the existing technology cannot adapt to the production needs of sheets of different thicknesses is solved, and the yield rate is significantly improved.
Patent Information
- Application Number
- CN202421032036.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The hydraulic control system of the existing pinch roller device cannot adapt to the production demand of sheets of different thicknesses, resulting in a decrease in the yield rate.
A hydraulic control system for pressure variable pinch rollers is designed, and the oil cylinder is controlled separately through two sets of hydraulic control systems to switch working pressure to achieve pressure selection according to the thickness of the steel plate.
The appropriate working pressure is selected according to the thickness of the steel plate, which avoids wrinkles caused by excessive pressure and overflow of the inner diameter tower shape and outer diameter due to excessive pressure, which significantly improves the yield rate.
Smart Images
Figure CN222502225U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a steel rolling machine, in particular to a pressure-variable pinch roller hydraulic control system. Background Art
[0002] In steel rolling machinery and equipment, the pinch roller is one of the essential and important equipment. The pinch roller device is generally installed in front of the coiler to transport the cold-rolled coil to the coiler. Due to the diversity of cold-rolled plate specifications and materials, there are generally obvious differences in the thickness of the cold-rolled plate after rolling and the hardness of the steel plate material according to different product requirements. When the hardness of thin materials is relatively soft, when the tail of the strip is cut off and is in a tension-free free state, if the pressure of the pinch roller is too large, the steel plate at the tail of the strip will be pressed into wrinkles. When the hardness of thick materials is relatively large, when the head of the strip enters the coiler, if the pressure of the pinch roller is too small at this time, the relatively hard steel plate cannot be pressed and stabilized, which will cause the inner diameter of the steel coil to appear in a winding tower shape, and the outer diameter will overflow when the tail of the strip is coiled.
[0003] The pinch roll device uses a hydraulic control system to provide clamping force to the cold rolled plate. The conventional pinch roll device hydraulic control system works based on a fixed pressure and delivers a constant clamping force to the outside, such as Figure 1 The conventional hydraulic control system of the pinch roller device cannot adapt to the production requirements of plates of different thicknesses, resulting in a lower yield rate. Utility Model Content
[0004] In view of the shortcomings of the prior art, the utility model provides a variable pressure pinch roller hydraulic control system. The utility model improves the hydraulic control system of the existing pinch roller device, controls the oil cylinders respectively through two sets of hydraulic control systems, controls the oil cylinder pressure by switching the currently working hydraulic control system, and then provides different working pressures to the pinch roller device. Thereby, pressure selection is realized according to the thickness of the steel plate.
[0005] The technical means adopted by the utility model are as follows:
[0006] A variable pressure pinch roller hydraulic control system, characterized in that it comprises: a hydraulic cylinder, a first hydraulic control unit and a second hydraulic control unit, wherein the first hydraulic control unit and the second hydraulic control unit are connected in parallel to control the hydraulic cylinder;
[0007] The hydraulic cylinder is dynamically connected to the pinch roller;
[0008] The first hydraulic control unit comprises a first one-way valve, a first flow control valve, a first hydraulically controlled one-way valve, a first electro-hydraulic reversing valve and a first pressure control valve, wherein the oil port P of the first electro-hydraulic reversing valve is connected to the first pressure oil source pipeline, the oil port T is connected to the first oil return pipeline, the oil port A and the oil port B are connected to the first flow control valve through the first hydraulically controlled one-way valve, the first output pipeline of the first flow control valve is connected to the first oil inlet pipeline of the hydraulic cylinder, and the second output pipeline of the first flow control valve is connected to the second oil inlet pipeline of the hydraulic cylinder through the first one-way valve connected in parallel with the first pressure control valve;
[0009] The second hydraulic control unit includes: a second flow control valve, a second hydraulically controlled one-way valve, a second pressure control valve and a second electro-hydraulic reversing valve, wherein the oil port P of the second electro-hydraulic reversing valve is connected to the first pressure oil source pipeline, the oil port T is connected to the first return oil pipeline, the oil port A and the oil port B are connected to the second flow control valve through the second pressure control valve and the second hydraulically controlled one-way valve, the first output pipeline of the second flow control valve is connected to the first oil inlet pipeline of the hydraulic cylinder, and the second output pipeline of the second flow control valve is connected to the second oil inlet pipeline of the hydraulic cylinder.
[0010] Furthermore, the hydraulic cylinder is a hydraulic cylinder with a buffer single output rod.
[0011] Further, the X oil port of the first electro-hydraulic reversing valve is connected to the control oil source pipeline, and the Y oil port is connected to the oil drain pipeline; the X oil port of the second electro-hydraulic reversing valve is connected to the control oil source pipeline, and the Y oil port is connected to the oil drain pipeline.
[0012] Furthermore, the first pressure oil source pipeline and the oil drain pipeline are connected via a pipeline provided with a first oil drain valve; the control oil source pipeline and the oil drain pipeline are connected via a pipeline provided with a second oil drain valve.
[0013] Furthermore, a pressure relay is provided on the first output pipeline of the first flow control valve.
[0014] Compared with the prior art, the utility model has the following advantages:
[0015] The utility model improves the hydraulic control system of the existing pinch roller device, without destroying the original production line or replacing the original devices. Only by adding a hydraulic control system, the original pinch roller device can be switched between two working pressures instead of only providing a single working pressure. The oil cylinder is controlled by two sets of hydraulic control systems respectively, and the oil cylinder pressure is controlled by switching the currently working hydraulic control system, thereby providing different working pressures to the pinch roller device, thereby realizing pressure selection according to the thickness of the steel plate, avoiding the occurrence of wrinkles in thin materials due to excessive pressure, and the occurrence of inner diameter tower shape and outer diameter overflow in thick materials due to too little pressure. The effect is obvious, and the yield rate has been greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0017] Figure 1 It is a schematic diagram of the structure of the hydraulic control system of the existing pinch roller device.
[0018] Figure 2 It is a schematic diagram of the structure of the hydraulic control system of the variable pressure pinch roller of the utility model.
[0019] In the figure: 1. hydraulic cylinder pipeline; 2. first on-off valve; 3. second on-off valve; 4. pressure relay; 5. first non-return valve; 6. first flow control valve; 7. first hydraulic non-return valve; 8. first electro-hydraulic reversing valve; 9. first pressure control valve; 10. first oil drain valve; 11. second oil drain valve; 12. third on-off valve; 13. second non-return valve; 14. fourth on-off valve; 15. third non-return valve; 16. fifth on-off valve; 17. sixth on-off valve; 18. second flow control valve; 19. second hydraulic non-return valve; 20. second pressure control valve; 21. second electro-hydraulic reversing valve. DETAILED DESCRIPTION
[0020] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0022] like Figure 2 As shown, the utility model provides a variable pressure pinch roller hydraulic control system, comprising: a hydraulic cylinder 1, a first hydraulic control unit and a second hydraulic control unit, wherein the first hydraulic control unit and the second hydraulic control unit control the hydraulic cylinder 1 in parallel, and the hydraulic cylinder 1 is connected to the pinch roller power.
[0023] Specifically, the hydraulic cylinder is used to drive the pinch rollers to press the cold-rolled sheet at a first working pressure under the control of the first hydraulic unit, or to drive the pinch rollers to press the cold-rolled sheet at a second working pressure under the control of the second hydraulic unit. Preferably, the first working pressure is 8MPa, and the second working pressure is 4MPa. Further preferably, the hydraulic cylinder 1 is a hydraulic cylinder with a buffer single-out rod.
[0024] In a preferred embodiment of the utility model, the first hydraulic control unit includes a first check valve 5, a first flow control valve 6, a first hydraulically controlled check valve 7, a first electro-hydraulic reversing valve 8 and a first pressure control valve 9, wherein the oil port P of the first electro-hydraulic reversing valve 8 is connected to the first pressure oil source pipeline, the oil port T is connected to the first oil return pipeline, the oil port A and the oil port B are connected to the first flow control valve 6 through the first hydraulically controlled check valve 7, the first output pipeline of the first flow control valve 6 is connected to the first oil inlet pipeline of the hydraulic cylinder, and the second output pipeline of the first flow control valve 6 is connected to the second oil inlet pipeline of the hydraulic cylinder through the first check valve 5 and the first pressure control valve 9 in parallel. Further, a pressure relay 4 is provided on the first output pipeline of the first flow control valve 6. The first flow control valve 6 is connected to the first oil inlet pipeline of the hydraulic cylinder 1 through the first on-off valve, and the oil port A of the first pressure control valve 9 is connected to the second oil inlet pipeline of the hydraulic cylinder 1 through the second on-off valve 3.
[0025] Specifically, as a preferred embodiment, in this embodiment, the diameter of the first one-way valve 5 is NG20, the diameter of the first flow control valve 6 is NG16, the diameter of the first hydraulically controlled one-way valve 7 is NG16, the diameter of the first electro-hydraulic reversing valve 8 is NG16 and the diameter of the first pressure control valve 9 is NG15.
[0026] In a preferred embodiment of the utility model, the second hydraulic control unit includes: a second flow control valve 18, a second hydraulically controlled one-way valve 19, a second pressure control valve 20 and a second electro-hydraulic reversing valve 21, wherein the oil port P of the second electro-hydraulic reversing valve 21 is connected to the first pressure oil source pipeline, the oil port T is connected to the first return oil pipeline, the oil port A and the oil port B are connected to the second flow control valve 18 through the second pressure control valve 20 and the second hydraulically controlled one-way valve 19, the first output pipeline of the second flow control valve 18 is connected to the first oil inlet pipeline of the hydraulic cylinder through the fifth on-off valve 16, and the second output pipeline of the second flow control valve 18 is connected to the second oil inlet pipeline of the hydraulic cylinder through the sixth on-off valve 17.
[0027] Specifically, as a preferred implementation, in this embodiment, the second flow control valve 18 has a diameter of NG16, the second hydraulically controlled one-way valve 19 has a diameter of NG16, the second pressure control valve 20 has a diameter of NG16, and the second electro-hydraulic reversing valve 21 has a diameter of NG16.
[0028] Further preferably, the X oil port of the first electro-hydraulic reversing valve 8 is connected to the control oil source pipeline, and the Y oil port is connected to the oil drain pipeline; the X oil port of the second electro-hydraulic reversing valve 21 is connected to the control oil source pipeline, and the Y oil port is connected to the oil drain pipeline. The first pressure oil source pipeline and the oil drain pipeline are connected through a pipeline provided with a first oil drain valve 10; the control oil source pipeline and the oil drain pipeline are connected through a pipeline provided with a second oil drain valve 11. Check valves are installed on both the return oil pipeline and the oil drain pipeline.
[0029] The utility model retains the original hydraulic system, and adds a hydraulic system on the basis of the hydraulic system. The two hydraulic systems serve the same actuator (hydraulic cylinder), and the pressure of the first hydraulic control unit is adjusted to 8MPa, and the pressure of the second hydraulic control unit is adjusted to 4MPa. When in use, according to the actual situation on site, the tail of the material of 0.8mm and below is easy to be pressed into wrinkles. In this system, the material of 0.8mm and below is defined as thin material, and the material of more than 0.8mm is defined as thick material.
[0030] When producing steel plates with a thickness of more than 0.8 mm, the first hydraulic control unit participates in the control of the hydraulic system, all solenoid valves in the second hydraulic control unit are not energized, and the second electro-hydraulic reversing valve 21 is a Y-type reversing valve in a neutral state, which will not provide pressure to the execution system and will not affect the control of the actuator by the first hydraulic control unit. The second hydraulic control unit has a one-way valve to prevent oil backflow. The pressing and opening of the pinch rollers are completely controlled by the 8MPa pressure of the first hydraulic control unit, so that the inner diameter of the steel coil will not be towered and the outer diameter will not overflow due to insufficient pressure.
[0031] When producing steel plates below 0.8mm, the second hydraulic control unit participates in the control of the hydraulic system, all solenoid valves of the first hydraulic control unit are not energized, the first electro-hydraulic reversing valve 8 is a Y-type reversing valve in a neutral state, and will not provide pressure to the execution system, and will not affect the control of the second hydraulic control unit on the actuator. The first hydraulic control unit has a one-way valve to prevent oil backflow. The pressing and opening of the pinch rollers are completely controlled by the 4MPa pressure of the second hydraulic control unit, so that the steel plate will not be pressed into wrinkles due to excessive pressure.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A variable pressure pinch roller hydraulic control system, characterized in that: include: A hydraulic cylinder (1), a first hydraulic control unit and a second hydraulic control unit, wherein the first hydraulic control unit and the second hydraulic control unit are connected in parallel to control the hydraulic cylinder; The hydraulic cylinder is dynamically connected to the pinch roller; The first hydraulic control unit comprises a first non-return valve (5), a first flow control valve (6), a first hydraulically controlled non-return valve (7), a first electro-hydraulic reversing valve (8) and a first pressure control valve (9), wherein the oil port P of the first electro-hydraulic reversing valve (8) is connected to a first pressure oil source pipeline, the oil port T is connected to a first oil return pipeline, the oil port A and the oil port B are connected to the first flow control valve (6) via the first hydraulically controlled non-return valve (7), the first output pipeline of the first flow control valve (6) is connected to a first oil inlet pipeline of the hydraulic cylinder, and the second output pipeline of the first flow control valve (6) is connected to a second oil inlet pipeline of the hydraulic cylinder via the first non-return valve (5) connected in parallel with the first pressure control valve (9); The second hydraulic control unit comprises: a second flow control valve (18), a second hydraulically controlled non-return valve (19), a second pressure control valve (20) and a second electro-hydraulic reversing valve (21), wherein the oil port P of the second electro-hydraulic reversing valve (21) is connected to the first pressure oil source pipeline, the oil port T is connected to the first oil return pipeline, the oil port A and the oil port B are connected to the second flow control valve (18) via the second pressure control valve (20) and the second hydraulically controlled non-return valve (19), the first output pipeline of the second flow control valve (18) is connected to the first oil inlet pipeline of the hydraulic cylinder, and the second output pipeline of the second flow control valve (18) is connected to the second oil inlet pipeline of the hydraulic cylinder.
2. A variable pressure pinch roller hydraulic control system according to claim 1, characterized in that: The hydraulic cylinder is a hydraulic cylinder with a buffer single output rod.
3. The variable pressure pinch roller hydraulic control system according to claim 1, characterized in that: The X oil port of the first electro-hydraulic reversing valve (8) is connected to a control oil source pipeline, and the Y oil port is connected to an oil drain pipeline; the X oil port of the second electro-hydraulic reversing valve (21) is connected to a control oil source pipeline, and the Y oil port is connected to an oil drain pipeline.
4. A variable pressure pinch roller hydraulic control system according to claim 3, characterized in that: The first pressure oil source pipeline and the oil drain pipeline are connected via a pipeline provided with a first oil drain valve (10); the control oil source pipeline and the oil drain pipeline are connected via a pipeline provided with a second oil drain valve (11).
5. The variable pressure pinch roller hydraulic control system according to claim 1, characterized in that: A pressure relay (4) is arranged on the first output pipeline of the first flow control valve (6).