A constant pressure ironing roll for an aluminum foil rolling mill and its control method

Abstract

A constant-pressure ironing roller and its control method for an aluminum foil rolling mill are disclosed. The ironing roller is floatingly connected to the ironing roller swing arm at both ends via a constant-pressure hydraulic cylinder assembly. In addition, the driving cylinder of the ironing roller swing arm is replaced with a swing arm control electric cylinder, which controls the rotation of the ironing roller swing arm to achieve the ironing roller's following control of the diameter of the aluminum foil wound on the roll. Since the ironing force exerted by the ironing roller on the roll is provided by the constant-pressure hydraulic cylinder assembly, the ironing force exerted by the ironing roller on the roll is no longer related to the position of the ironing roller swing arm. That is, during the process of the ironing roller following the diameter of the aluminum foil wound on the roll, the ironing force exerted by the ironing roller on the roll remains constant, thereby solving the problems of ironing roller vibration, aluminum foil winding wrinkles, and delamination caused by the fluctuation of the ironing force exerted by the ironing roller on the roll.

Description

Technical Field

[0001] This invention relates to the field of ironing roll structure and pressure control technology for aluminum foil rolling mills, specifically to a constant pressure ironing roll and control method for aluminum foil rolling mills. Background Technology

[0002] The existing design of the ironing rollers in aluminum foil rolling mills causes the ironing force acting on the roll to gradually decrease as the diameter of the aluminum foil roll on the roll increases. Therefore, in the actual production process of aluminum foil rolling mills, operators need to increase the pressure of the ironing roller swing arm drive cylinder according to the diameter of the aluminum foil roll on the roll. This places high demands on the operators and increases their workload. In addition, the operator adjusts and controls the pressure of the ironing roller swing arm drive cylinder in stages. During this process, the ironing force acting on the roll is fluctuating. When the operator does not adjust and control the pressure of the ironing roller swing arm drive cylinder in time or operates improperly, causing large fluctuations in the ironing force acting on the roll, quality defects such as ironing roller vibration, aluminum foil winding wrinkles, and delamination are likely to occur. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention discloses a constant pressure ironing roller for an aluminum foil rolling mill. The two ends of the ironing roller are floatingly connected to the ironing roller swing arm via a constant pressure hydraulic cylinder assembly. In addition, the driving cylinder of the ironing roller swing arm is replaced with a swing arm control electric cylinder, which controls the rotation of the ironing roller swing arm to achieve the ironing roller's following control of the diameter of the aluminum foil wound by the roll. Since the ironing force exerted by the ironing roller on the roll is provided by the constant pressure hydraulic cylinder assembly, the ironing force exerted by the ironing roller on the roll is no longer related to the position of the ironing roller swing arm. That is, during the process of the ironing roller's following control of the diameter of the aluminum foil wound by the roll, the ironing force exerted by the ironing roller on the roll remains constant.

[0004] To achieve the aforementioned objective, the present invention employs the following technical solution: a constant-pressure ironing roller for an aluminum foil rolling mill, comprising an ironing roller, bearing housings, a constant-pressure cylinder assembly, and an ironing roller swing arm; the left and right ends of the ironing roller are rotatably connected to the bearing housings via bearings, and the bearing housings are floatingly disposed on the lower side of one end of the ironing roller swing arm via the constant-pressure cylinder assembly; a swing arm control electric cylinder is hinged to the other end of the ironing roller swing arm; the middle part of the ironing roller swing arm is hinged to the winding machine bracket; since the ironing roller swing arm of the present invention is controlled by a swing arm control electric cylinder, the position of the ironing roller swing arm can be precisely controlled and locked. Simultaneously, the bearing housings at the left and right ends of the ironing roller are connected to the ironing roller swing arm under constant pressure, therefore the pressure applied by the ironing roller to the roll is no longer affected by the position of the ironing roller swing arm. As the diameter of the aluminum foil wound by the roll gradually increases, and the ironing roller follows the diameter of the aluminum foil wound by the roll, the ironing force exerted by the ironing roller on the roll remains constant.

[0005] Furthermore, the constant pressure cylinder assembly includes a cylinder body, a cylinder bottom end cover, a piston rod end cover, and a piston. The cylinder bottom end cover and the piston rod end cover are fixedly installed at the upper and lower ends of the cylinder body.

[0006] A piston rod is fixedly mounted on the lower end face of the piston. Several piston through holes are evenly distributed around the piston's axis. The piston is movably positioned within the cavity of the cylinder body, dividing the cavity into a piston chamber and a piston rod chamber, which are connected through the piston through holes. The piston rod extends through a piston rod end cap to the outside of the end cap, and a piston rod end flange is fixedly mounted at the end of the piston rod. A bearing seat is fixedly mounted below the piston rod end flange. After the constant pressure cylinder assembly is connected to high-pressure hydraulic oil, a pressure difference is generated at both ends of the piston (due to the presence of the piston rod, the area at both ends of the piston is not...). (and is a constant), this pressure difference is only related to the pressure of the high-pressure hydraulic oil and the area difference at both ends of the piston, and is independent of the position of the piston in the cylinder. Therefore, the pressure provided to the ironing roller by the bearing seat remains stable when the high-pressure hydraulic oil pressure is stable. During the process of the ironing roller following the diameter of the aluminum foil wound by the roll, the ironing roller is always pressed against the roll. When the position of the piston in the cylinder changes, the force of the ironing roller pressing against the roll remains stable because the high-pressure hydraulic oil pressure remains stable.

[0007] Furthermore, a displacement sensor is fixedly installed on the constant pressure cylinder assembly. The displacement sensor can be a laser displacement sensor or an inductive displacement sensor. The displacement sensor measures the displacement of the piston rod end flange relative to the cylinder body. The actual measurement is the displacement of the ironing roller bearing seat relative to the ironing roller swing arm. When the position of the ironing roller swing arm is locked by the swing arm control electric cylinder, this displacement is actually the thickness of the aluminum foil wound on the roll, or the change in diameter of the roll after the aluminum foil is wound.

[0008] Furthermore, the constant pressure cylinder assembly is connected to a hydraulic system via hydraulic pipelines; the hydraulic system includes an accumulator; the accumulator is connected to the aluminum foil rolling mill hydraulic system via inlet P, and a main hydraulic circuit switch valve is installed on the hydraulic pipeline between the accumulator and inlet P; the accumulator is also connected to a pressure regulating pump; an accumulator hydraulic circuit switch valve and pressure sensor A are installed on the hydraulic pipeline between the accumulator and the constant pressure cylinder assembly; a pressure sensor B is also installed at the accumulator; an oil unloading channel is provided between the accumulator and the oil tank, and a proportional relief valve is installed on the oil unloading channel; in this hydraulic system, the initial pressure of the accumulator is provided by the aluminum foil rolling mill hydraulic system, and the accumulator pressure is regulated by the pressure regulating pump and the proportional relief valve. The pressure regulating pump pumps high-pressure hydraulic oil into the accumulator to increase the accumulator pressure; the proportional relief valve releases the hydraulic oil in the accumulator to reduce the accumulator pressure; pressure sensor A is used to detect the pressure value of the pressure regulating cylinder, and pressure sensor B is used to detect the pressure value of the accumulator.

[0009] A method for controlling a constant pressure ironing roller in an aluminum foil rolling mill includes controlling the working pressure of the ironing roller and controlling the ironing roller's following control of the diameter of the aluminum foil wound by the roll.

[0010] The working pressure control of the ironing roller is achieved by controlling the pressure regulating pump or proportional relief valve to maintain a set constant pressure in the accumulator of the hydraulic system; the constant pressure of the accumulator enables the constant pressure cylinder combination to provide a constant working pressure to the ironing roller.

[0011] The ironing roller's control over the diameter of the aluminum foil being wound by the roll is achieved by using a displacement sensor to collect the displacement signal from the flange at the end of the piston rod, which in turn controls the movement of the electric cylinder via the swing arm, thus forming a closed-loop control system for the ironing roller's control over the diameter of the aluminum foil being wound by the roll.

[0012] Furthermore, the ironing roller's control of the aluminum foil diameter being wound by the roll is a PID control. This control method is a continuous dynamic control, which places relatively high demands on the control system software.

[0013] Preferably, the control of the ironing roller to follow the diameter of the aluminum foil wound by the roll is a cumulative stage control. This type of control is intermittent and has relatively low requirements for the control system software, but it can still achieve good control results.

[0014] Due to the adoption of the above-described technical solution, the present invention has the following beneficial effects: The present invention discloses a constant pressure ironing roller and control method for an aluminum foil rolling mill. The two ends of the ironing roller are floatingly connected to the ironing roller swing arm through a constant pressure hydraulic cylinder assembly. In addition, the driving cylinder of the ironing roller swing arm is changed to a swing arm control electric cylinder, which controls the rotation of the ironing roller swing arm to achieve the ironing roller's following control of the diameter of the aluminum foil wound on the roll. Since the ironing force of the ironing roller on the roll is provided by the constant pressure hydraulic cylinder assembly, the ironing force of the ironing roller on the roll is no longer related to the position of the ironing roller swing arm. That is, during the following control process of the ironing roller on the diameter of the aluminum foil wound on the roll, the ironing force of the ironing roller on the roll remains constant, thereby solving the problems of ironing roller vibration, aluminum foil winding wrinkles, and delamination caused by the fluctuation of the ironing force of the ironing roller on the roll. Attached Figure Description

[0015] Figure 1 A schematic diagram illustrating the lateral principle of the constant pressure ironing roller in an aluminum foil rolling mill;

[0016] Figure 2 A schematic diagram illustrating the forward principle of the constant pressure ironing roller in an aluminum foil rolling mill.

[0017] Figure 3 A schematic cross-sectional view of the constant pressure ironing roll structure of an aluminum foil rolling mill;

[0018] Figure 4 This is a schematic cross-sectional view of the constant pressure hydraulic cylinder assembly;

[0019] Figure 5 This is a schematic diagram of a hydraulic system.

[0020] In the diagram: 1. Ironing roller; 2. Bearing; 3. Bearing housing; 4. Constant pressure cylinder assembly; 4.1. Cylinder body; 4.2. Cylinder bottom end cover; 4.3. Piston rod end cover; 4.4. Piston; 4.4.1. Piston through hole; 4.4.2. Piston rod; 4.4.3. Piston rod end flange; 5. Ironing roller swing arm; 6. Swing arm control electric cylinder; 7. Vibration damping pad; 8. Roller; 9. Hydraulic system; 9.1. Accumulator; 9.2. Pressure regulating pump; 9.3. Main hydraulic circuit switch valve; 9.4. Accumulator hydraulic circuit switch valve; 9.5. Pressure sensor A; 9.6. Proportional relief valve; 9.7. Pressure sensor B; 10. Displacement sensor. Detailed Implementation

[0021] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0022] A constant pressure ironing roller for an aluminum foil rolling mill includes an ironing roller 1, a bearing housing 3, a constant pressure cylinder assembly 4, and an ironing roller swing arm 5. The left and right ends of the ironing roller 1 are rotatably connected to the bearing housing 3 via bearings 2. The bearing housing 3 is floatingly mounted on the lower side of one end of the ironing roller swing arm 5 via the constant pressure cylinder assembly 4. The other end of the ironing roller swing arm 5 is hinged to a swing arm control electric cylinder 6. The swing arm control electric cylinder 6 is characterized by simple control, high precision, and a self-locking function. After the swing arm control electric cylinder 6 completes the position adjustment of the ironing roller swing arm 5, it can accurately lock the position of the ironing roller swing arm 5. The middle part of the ironing roller swing arm 5 is hinged to the winding machine bracket.

[0023] The constant pressure cylinder assembly 4 includes a cylinder body 4.1, a cylinder bottom end cover 4.2, a piston rod end cover 4.3, and a piston 4.4. The cylinder bottom end cover 4.2 and the piston rod end cover 4.3 are fixedly installed at the upper and lower ends of the cylinder body 4.1. A piston rod 4.4.2 is fixedly installed on the lower end face of the piston 4.4. Several piston through holes 4.4.1 are evenly distributed around the piston 4.4. The piston 4.4 is movably installed in the cavity of the cylinder body 4.1, dividing the cavity of the cylinder body 4.1 into a piston cavity and a piston rod cavity. The piston cavity and the piston rod cavity are connected through the piston through holes 4.4.1. The piston rod 4.4.2 extends through the piston rod end cover 4.3 to the outside of the piston rod end cover 4.3. A piston rod end flange 4.4.3 is fixedly installed at the end of the piston rod 4.4.2. A bearing seat 3 is fixedly installed on the lower side of the piston rod end flange 4.4.3. A displacement sensor 10 is fixedly installed on the constant pressure cylinder assembly 4.

[0024] The constant pressure cylinder assembly 4 is connected to a hydraulic system 9 via hydraulic pipelines. The hydraulic system 9 includes an accumulator 9.1. The accumulator 9.1 is connected to the aluminum foil rolling mill hydraulic system via an oil inlet P. A main hydraulic circuit switch valve 9.3 is installed on the hydraulic pipeline between the accumulator 9.1 and the oil inlet P. The accumulator 9.1 is also connected to a pressure regulating pump 9.2. An accumulator hydraulic circuit switch valve 9.4 and a pressure sensor A 9.5 are installed on the hydraulic pipeline between the accumulator 9.1 and the constant pressure cylinder assembly 4. A pressure sensor B 9.7 is also installed at the accumulator 9.1. An oil unloading channel is provided between the accumulator 9.1 and the oil tank, and a proportional relief valve 9.6 is installed on the oil unloading channel.

[0025] A method for controlling a constant pressure ironing roller in an aluminum foil rolling mill includes controlling the working pressure of the ironing roller 1 and controlling the ironing roller 1 to follow the diameter of the aluminum foil wound by the roll 8.

[0026] The working pressure control of the ironing roller 1 is achieved by controlling the pressure regulating pump 9.2 or the proportional relief valve 9.6 to maintain a set constant pressure in the accumulator 9.1 of the hydraulic system 9. The constant pressure of the accumulator 9.1 provides a constant working pressure to the ironing roller 1 through the constant pressure cylinder assembly 4. The specific control process is as follows: First, high-pressure hydraulic oil is supplied through the aluminum foil rolling mill hydraulic system to establish the working pressure of the accumulator 9.1 in the hydraulic system 9. When the initial pressure of the accumulator 9.1 is established, the main hydraulic circuit switch valve 9.3 is opened, and the accumulator... With the hydraulic circuit switch valve 9.4 and proportional relief valve 9.6 closed, the high-pressure hydraulic oil supplied by the aluminum foil rolling mill hydraulic system enters the accumulator 9.1 through inlet P. When the pressure sensor B9.7 reaches the set value, the main hydraulic circuit switch valve 9.3 is closed, and the initial pressure of the accumulator 9.1 is established. The pressure control of the accumulator 9.1 is achieved through the pressure regulating pump 9.2 or the proportional relief valve 9.6. The pressure regulating pump 9.2 is a micro-hydraulic pump, which will not generate excessive pressure shock to the hydraulic system when it starts up. The overflow valve 9.6 can control the overflow flow rate according to the signal given by the control system to prevent the pressure of the accumulator 9.1 from dropping too quickly. When the pressure of the accumulator 9.1 is lower than the set pressure (due to leakage in the hydraulic system 9), the pressure regulating pump 9.2 is activated to pump high-pressure hydraulic oil into the accumulator 9.1, gradually increasing the pressure until the set pressure is reached. When the pressure of the accumulator 9.1 is higher than the set pressure, the control system sends a control signal to activate the proportional overflow valve 9.6, gradually reducing the pressure of the accumulator 9.1. Until the set pressure is reached; after opening the accumulator hydraulic circuit switch valve 9.4, the constant pressure cylinder assembly 4 is connected to the accumulator 9.1, and high pressure hydraulic oil enters the constant pressure cylinder assembly 4. The high pressure hydraulic oil generates a pressure difference at both ends of the piston 4.4. This pressure difference is transmitted to the bearing seat 3 through the piston rod end flange 4.4.3, and then to the ironing roller 1 through the bearing seat 3. The ironing roller 1 presses on the roll 8 with a constant pressure. When the pressure of the accumulator 9.1 is stable, the pressure applied by the ironing roller 1 to the roll 8 remains constant.

[0027] The tracking control of the ironing roller 1 to the diameter of the aluminum foil wound on the roll 8 is achieved by using the displacement signal of the piston rod end flange 4.4.3 collected by the displacement sensor 10 to control the movement of the swing arm control electric cylinder 6, forming a closed loop for tracking the diameter of the aluminum foil wound on the roll 8 by the ironing roller 1. The control process is as follows: Before the winding machine starts working, the working pressure of the accumulator 9.1 is first adjusted so that the piston 4.4 in the constant pressure cylinder assembly 4 moves to the lowest end of the cylinder body 4.1; the swing arm control electric cylinder 6 is started, driving the ironing roller swing arm 5 to rotate, so that the ironing roller 1 presses against the roll 8. Under the pressing force of the ironing roller 1, the piston 4.4 moves upward in the cylinder body 4.1. At this time, the displacement sensor... When the piston rod end flange 4.4.3 is detected to have shifted, and the shift reaches 10mm, the swing arm control electric cylinder 6 stops working, and the position of the ironing roller swing arm 5 is locked. The output data of the displacement sensor 10 is cleared, and the ironing roller 1 enters the PID control mode to follow the diameter of the aluminum foil wound by the roll 8. When the winding machine is working, the diameter of the aluminum foil wound by the roll 8 changes, and the data collected by the displacement sensor 10 changes accordingly. The control system controls the swing arm control electric cylinder 6 to move according to the data collected by the displacement sensor 10, and the ironing roller swing arm 5 drives the ironing roller 1 to dynamically follow the diameter of the aluminum foil wound by the roll 8.

[0028] Another method of controlling the ironing roller 1 to follow the diameter of the aluminum foil wound by the roll 8 is a cumulative stage control. This control method works as follows: When the winding machine is working, the diameter of the aluminum foil wound by the roll 8 changes, and the data collected by the displacement sensor 10 changes accordingly. When the cumulative data collected by the displacement sensor 10 reaches 25mm, the control system sends a control signal to control the swing arm control cylinder 6 to move, causing the ironing roller swing arm 5 to rotate. At this time, the data collected by the displacement sensor 10 will gradually decrease until the data collected by the displacement sensor 10 returns to zero, at which point the swing arm control cylinder 6 stops working, locking the ironing roller swing arm 5 in a new position. In this control method, the movement speed of the swing arm control cylinder 6 should be controlled to avoid excessive rotation speed of the ironing roller swing arm 5, which could cause large fluctuations in the pressure of the ironing roller 1.

[0029] The parts of this invention not described in detail are prior art.

Claims

1. A control method for a constant pressure ironing roller in an aluminum foil rolling mill, wherein the constant pressure ironing roller includes an ironing roller (1), a bearing seat (3), a constant pressure cylinder assembly (4), and an ironing roller swing arm (5); the left and right ends of the ironing roller (1) are rotatably connected to the bearing seat (3) via bearings (2), and the bearing seat (3) is floatingly disposed on the lower side of one end of the ironing roller swing arm (5) via the constant pressure cylinder assembly (4); a swing arm control electric cylinder (6) is hinged to the other end of the ironing roller swing arm (5); the middle part of the ironing roller swing arm (5) is hinged to the winding machine bracket; the constant pressure cylinder assembly (4) includes an ironing roller (1), a bearing seat (3), a constant pressure cylinder assembly (4), and a constant pressure cylinder assembly (4). The cylinder includes a cylinder body (4.1), a cylinder bottom end cap (4.2), a piston rod end cap (4.3), and a piston (4.4). The cylinder bottom end cap (4.2) and the piston rod end cap (4.3) are fixedly installed at the upper and lower ends of the cylinder body (4.1), respectively. A piston rod (4.4.2) is fixedly installed on the lower end face of the piston (4.4). The piston (4.4) has several piston through holes (4.4.1) evenly distributed around its axis. The piston (4.4) is movably installed in the cavity of the cylinder body (4.1), dividing the cavity of the cylinder body (4.1) into a piston cavity and a piston rod cavity. The piston cavity and the piston rod cavity are connected by piston through holes. The hole (4.4.1) is connected; the piston rod (4.4.2) extends through the piston rod end cap (4.3) to the outside of the piston rod end cap (4.3), and the piston rod end flange (4.4.3) is fixedly installed at the end of the piston rod (4.4.2); the bearing seat (3) is fixedly installed on the lower side of the piston rod end flange (4.4.3); the displacement sensor (10) is fixedly installed on the constant pressure cylinder assembly (4); the constant pressure cylinder assembly (4) is connected to the hydraulic system (9) through the hydraulic pipeline; the hydraulic system (9) includes an accumulator (9.1); the accumulator (9.1) is connected to the aluminum through the oil inlet P. The hydraulic system of the foil rolling mill is connected as follows: a main hydraulic circuit switch valve (9.3) is installed on the hydraulic pipeline between the accumulator (9.1) and the oil inlet P; the accumulator (9.1) is also connected to a pressure regulating pump (9.2); an accumulator hydraulic circuit switch valve (9.4) and a pressure sensor A (9.5) are installed on the hydraulic pipeline between the accumulator (9.1) and the constant pressure cylinder assembly (4); a pressure sensor B (9.7) is also installed at the accumulator (9.1); an oil unloading channel is provided between the accumulator (9.1) and the oil tank, and a proportional relief valve (9.6) is installed on the oil unloading channel; its characteristics are: This includes the working pressure control of the ironing roller (1) and the following control of the ironing roller (1) on the diameter of the aluminum foil wound by the roll (8); The working pressure control of the ironing roller (1) is achieved by controlling the pressure regulating pump (9.2) or the proportional relief valve (9.6) to keep the accumulator (9.1) of the hydraulic system (9) at a set constant pressure; the constant pressure of the accumulator (9.1) enables the constant pressure cylinder assembly (4) to provide a constant working pressure to the ironing roller (1); The ironing roller (1) controls the diameter of the aluminum foil wound by the roller (8) by using the displacement signal of the piston rod end flange (4.4.3) collected by the displacement sensor (10) to control the movement of the swing arm control electric cylinder (6), thus forming a closed loop of ironing roller (1) controlling the diameter of the aluminum foil wound by the roller (8).

2. The control method for the constant pressure ironing roll of the aluminum foil rolling mill according to claim 1, characterized in that: The ironing roller (1) follows the diameter of the aluminum foil wound by the roll (8) using PID control.

3. The control method for the constant pressure ironing roll of the aluminum foil rolling mill according to claim 1, characterized in that: The following control of the diameter of the aluminum foil wound by the ironing roller (1) and the roll (8) is a cumulative stage control.

Images