A driveless squeezing device and its control method based on a compensation algorithm

Abstract

This invention provides a driveless extrusion device and its control method based on a compensation algorithm. The device employs a structure where the upper extrusion roller is driven by a cylinder for precision pressure application, and the lower extrusion roller is driven by a lifting mechanism for coarse adjustment, with the upper and lower extrusion rollers arranged in a staggered configuration. The electrical control system incorporates a dynamic force compensation algorithm module, which calculates and compensates in real time for the effects of the upper roller unit's gravity, guide rail sliding friction, and cylinder sealing friction on the output pressure. The control method includes parameter calibration, initial adjustment, process setting, rapid approach, precision pressing, steady-state extrusion, and lifting steps. This invention solves the problem of achieving high-precision extrusion in existing technologies, enabling precise and stable control of extrusion pressure. It is particularly suitable for extruding ultra-thin or high-surface-quality strips, and offers advantages such as non-damage, energy saving, strong adaptability, and convenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of continuous processing technology for metal strips; and more particularly to a driveless extrusion device and its control method based on a compensation algorithm. Background Technology

[0002] In the field of continuous metal strip processing technology, such as cleaning and degreasing, cleaning and straightening, coating and plating units, and pickling, residual cleaning solution on the strip surface must be removed after the cleaning stage to prevent blemishes and ensure the quality of subsequent processes. Traditional extrusion devices mostly use motors to independently drive the extrusion rollers, which has drawbacks such as complex transmission systems, high procurement, installation and maintenance costs, and susceptibility to strip scratches caused by asynchronous speeds.

[0003] Driveless extrusion technology has emerged, relying on the friction of the strip to drive the extrusion rollers, thus eliminating the risk of scratches. However, existing technologies still have significant shortcomings: low pressure control precision, failure to consider the dynamic effects of guide rail friction, cylinder seal friction, and roller gravity during lifting, unstable extrusion results, difficulty in achieving a balance between efficient extrusion and gentle handling of strips with high surface quality requirements, and susceptibility to strip deformation due to pressure fluctuations.

[0004] Therefore, developing a transmissionless device and method with precise pressure control, reasonable structure, and particularly suitable for high-precision extrusion under micro-pressure has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a driveless squeezing device and its control method based on a compensation algorithm. This invention provides a driveless squeezing device and its intelligent control method that features optimized structure, high pressure control accuracy, and, in particular, stable and reliable micro-pressure squeezing.

[0006] This invention is achieved through the following technical solution:

[0007] This invention relates to a non-transmission squeezing device based on a compensation algorithm, comprising: a frame 1, a cylinder 2, a connecting rod assembly 3, an upper squeezing roller unit, an upper slide rail 6, a lower squeezing roller unit, a lower slide rail 8, a connecting shaft 10, a lifting platform 11, a strip material 12, and an electrical control system.

[0008] The upper extrusion roller unit includes an upper bearing seat 4 and an upper extrusion roller 5.

[0009] The lower squeeze roller unit includes a lower bearing housing 9 and a lower squeeze roller 7;

[0010] The cylinder 2 is mounted on the frame 1 by screws and is connected to the upper bearing seat 4 by the connecting rod assembly 3;

[0011] The upper slide rail 6 is installed on the frame 1 by screws, and the upper extrusion roller 5 is installed on the upper bearing seat 4 by bearings. The upper bearing seat 4 moves up and down along the upper slide rail 6.

[0012] The elevator 11 is mounted on the frame 1 with screws and is connected to the lower bearing seat 9 via the connecting shaft 10;

[0013] The lower slide chute 8 is mounted to the frame 1 by screws, and the lower extrusion roller 7 is mounted to the lower bearing seat 9 by bearings. The lower bearing seat 9 moves up and down along the lower slide chute 8.

[0014] The upper extrusion roller 5 and the lower extrusion roller 7 are offset relative to each other and form an "S" shaped roller gap. The strip 12 passes through the "S" shaped roller gap. When the production line is running, the strip 12 passes through the "S" shaped roller gap formed by the upper extrusion roller 5 and the lower extrusion roller 7 to achieve the extrusion function.

[0015] The electrical control system achieves high-precision extrusion through control elements.

[0016] Preferably, the electrical control system has a built-in dynamic force compensation algorithm module.

[0017] Preferably, the dynamic force compensation algorithm module is configured as follows: based on the set target pressure F s It calculates and compensates in real time for the gravity G and the sliding friction F of the guide rail on the upper squeezing roller unit during its movement. f and cylinder seal friction force F mf Control the output force of the upper roller drive system so that the pressure applied to the strip 12 is equal to the target pressure F. s Consistent.

[0018] Preferably, the upper roller drive system uses an electro-proportional valve or a servo-proportional valve as a pneumatic control element.

[0019] Preferably, the driveless extrusion device based on the compensation algorithm further includes: a displacement sensor for detecting the position of the upper extrusion roller unit, a force sensor for directly measuring the force on the bearing seat of the upper extrusion roller unit, and an electric proportional valve or a servo proportional valve forming a position-force composite closed-loop control system.

[0020] Preferably, the algorithm logic of the dynamic force compensation algorithm module includes: a pressing process, a steady-state process, and a lifting process;

[0021] Clamping process: Cylinder output force F cyd =F s +F f +F mf -G;

[0022] Steady-state process: Cylinder output force F cys =F s +Ff +F mf -G;

[0023] Lifting process: Cylinder output force F cyu =F f +F mf +G.

[0024] This invention also relates to the aforementioned control method for a driveless squeezing device based on a compensation algorithm, comprising the following steps:

[0025] Step S1, parameter calibration: Under no-load conditions, drive the upper extrusion roller unit to rise and fall multiple times throughout its entire stroke. By collecting cylinder pressure and displacement data, calculate the guide rail friction force F at different positions. f Friction force F with cylinder seal mf The overall resistance curve is obtained and stored in the control system;

[0026] Step S2, Initial Adjustment: Adjust the lower extrusion roller unit to the predetermined reference height according to the strip thickness and process requirements;

[0027] Step S3, Process Setting: Input the target net extrusion pressure F s ;

[0028] Step S4, rapid approach: control the upper extrusion roller unit to rapidly descend to a preset position close to the surface of the strip 12;

[0029] Step S5, Precision Pressing: Switch to upper roller force control mode, according to formula F cyd =F s +F f +F mf -G calculates and controls the cylinder output force in real time, so that the upper extrusion roller 5 gently contacts and presses the strip 12 until the net pressure acting on the strip 12 reaches F. s ;

[0030] Step S6, steady-state extrusion: During the operation of strip 12, according to the compensation formula F cys =F s +F f +F mf -G adjusts the cylinder pressure to maintain a net extrusion pressure of F. s ;

[0031] Step S7, process ends: According to formula F cyu =F f +F mf +G controls the output force of the cylinder to lift the upper extrusion roller unit.

[0032] The present invention has the following advantages:

[0033] (1) High-precision micro-pressure extrusion: By incorporating a dynamic force compensation algorithm module into the electrical control system and using a full resistance dynamic compensation algorithm, the interference of the inherent resistance of the mechanical system on micro-pressure control is fundamentally eliminated, making precise and stable extrusion possible. It is particularly suitable for ultra-thin strips, high-strength steel and products with high surface quality requirements.

[0034] (2) High extrusion quality and no damage: The present invention has a transmission-free design structure, which completely eliminates scratches. The micro-pressure mode greatly reduces the elastic deformation of the roller surface and the plastic deformation of the strip, reduces frictional heat and wear, and extends the roller life.

[0035] (3) Intelligent control and strong adaptability: The present invention is equipped with an electrical control system, which can adaptively compensate for the resistance changes caused by mechanical wear through calibration data.

[0036] (4) The present invention has a reasonable structural design, is easy to maintain and install, saves energy and reduces consumption, and is easy to implement. Attached Figure Description

[0037] Figure 1 A schematic diagram of the micro-pressure, transmissionless squeezing device based on a compensation algorithm involved in this invention;

[0038] Figure 2 for Figure 1 Top view;

[0039] Figure 3 This is a flowchart illustrating the working process of the micro-pressure, transmissionless squeezing device based on a compensation algorithm involved in this invention.

[0040] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Cylinder; 3. Connecting rod assembly; 4. Upper bearing seat; 5. Upper squeeze roller; 6. Upper slide rail; 7. Lower squeeze roller; 8. Lower slide rail; 9. Lower bearing seat; 10. Connecting shaft; 11. Elevator; 12. Strip material. Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are merely further illustrations of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, this embodiment relates to a non-transmission squeezing device based on a compensation algorithm, including: a frame 1, a cylinder 2, a connecting rod assembly 3, an upper squeezing roller unit, an upper slide rail 6, a lower squeezing roller unit, a lower slide rail 8, a connecting shaft 10, a lifting platform 11, a strip material 12, and an electrical control system.

[0044] The upper squeezing roller unit includes an upper bearing seat 4 and an upper squeezing roller 5, while the lower squeezing roller unit includes a lower bearing seat 9 and a lower squeezing roller 7. The cylinder 2 is mounted to the frame 1 by screws and is connected to the upper bearing seat 4 via a connecting rod assembly 3. The upper squeezing roller 5 is mounted to the upper bearing seat 4 via bearings, and the upper bearing seat 4 moves up and down along an upper slide rail 6, which is mounted to the frame 1 by screws. The elevator 11 is mounted to the frame 1 by screws and is connected to the lower bearing seat 9 via a connecting shaft 10. The lower squeezing roller 7 is mounted to the lower bearing seat 9 via bearings, and the lower bearing seat 9 moves up and down along a lower slide rail 8, which is mounted to the frame 1 by screws. During production line operation, the strip 12 passes through the "S"-shaped roller gap formed by the upper squeezing roller 5 and the lower squeezing roller 7, achieving the squeezing function. The electrical control system ultimately achieves high-precision squeezing through control elements.

[0045] The electrical control system has a built-in dynamic force compensation algorithm module, which is configured to: based on the set target pressure F s It calculates and compensates in real time for the gravity G and the sliding friction F of the guide rail on the upper squeezing roller unit during its movement. f and cylinder seal friction force F mf This controls the output force of the upper roller drive system, ensuring that the pressure applied to the strip is consistent with F. s Precise and consistent.

[0046] In practical applications, the upper extrusion roller 5 is raised and lowered under no-load conditions. The pressure and displacement of the lower cylinder 2 at different positions are recorded, and the sliding friction force F of the simulated guide rail is calculated. f and cylinder seal friction force F mf Curve. Adjust the lower squeeze roller 7 to the process height, then control the upper squeeze roller 5 to descend rapidly. When it approaches the strip 12, switch to force control mode. The PLC adjusts the pressure according to the target pressure F. s F corresponding to real-time location f and F mf Given the known G, the target air pressure is calculated according to the formula. The output force of cylinder 2 is controlled by the proportional valve to achieve precise pressing and steady-state maintenance. The upper extrusion roller 5 is smoothly lifted, and finally the extrusion of ultra-thin or high surface quality strip is achieved. It has the advantages of non-damage, energy saving, strong adaptability and convenient maintenance.

[0047] Example 2

[0048] This embodiment relates to a non-transmission squeezing device based on a compensation algorithm. Building upon Embodiment 1, the control logic of the dynamic force compensation algorithm is specifically as follows: During the pressing process: the cylinder outputs force F... cyd =F s +F f +F mf -G; Steady-state process: Cylinder output force F cys =F s+F f +F mf -G; Lifting process: Cylinder output force F cyu =F f +F mf +G.

[0049] In practical applications, it can achieve high-precision control of micro-pressure.

[0050] Example 3

[0051] Based on Example 1: A micro-pressure, driveless squeezing control method for the above-mentioned device is provided, see [link to example]. Figure 3 As shown, it includes the following steps:

[0052] S1: Parameter Calibration: Under no-load conditions, the upper extrusion roller unit is driven to rise and fall multiple times throughout its entire stroke. By collecting cylinder pressure and displacement data, the guide rail friction force F at different positions is calculated. f Friction force F with cylinder seal mf The comprehensive resistance curve is generated and stored in the control system.

[0053] S2: Initial adjustment: Adjust the lower extrusion roller unit to the predetermined reference height according to the strip thickness and process requirements.

[0054] S3: Process Setting: Input Target Net Extrusion Pressure F s .

[0055] S4: Rapid Approach: Control the upper extrusion roller unit to rapidly descend to a preset position close to the surface of the strip 12.

[0056] S5: Precision Pressing: Switch to upper roller force control mode, according to formula F cyd =F s +F f +F mf -G calculates and controls the cylinder output force in real time, so that the upper extrusion roller 5 gently contacts and presses the strip 12 until the net pressure acting on the strip 12 reaches F. s .

[0057] S6: Steady-state extrusion: During the operation of strip 12, continuously according to the compensation formula F cys =F s +F f +F mf -G adjusts the cylinder pressure to stably maintain the net extrusion pressure at F. s .

[0058] S7: Process End: According to formula F cyu =F f +F mf +G controls the output force of the cylinder to smoothly lift the upper extrusion roller unit.

[0059] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A driveless squeezing device based on a compensation algorithm, characterized in that, include: The frame (1), cylinder (2), connecting rod assembly (3), upper squeezing roller unit, upper slide rail (6), lower squeezing roller unit, lower slide rail (8), connecting shaft (10), elevator (11), strip (12) and electrical control system; The upper extrusion roller unit includes an upper bearing seat (4) and an upper extrusion roller (5). The lower extrusion roller unit includes a lower bearing housing (9) and a lower extrusion roller (7). The cylinder (2) is mounted on the frame (1) by screws and is connected to the upper bearing seat (4) by the connecting rod assembly (3); The upper slide rail (6) is installed on the frame (1) by screws, and the upper extrusion roller (5) is installed on the upper bearing seat (4) by bearings. The upper bearing seat (4) moves up and down along the upper slide rail (6). The elevator (11) is mounted on the frame (1) by screws and is connected to the lower bearing seat (9) by a connecting shaft (10); The lower slide (8) is mounted to the frame (1) by screws, and the lower extrusion roller (7) is mounted to the lower bearing seat (9) by bearings. The lower bearing seat (9) moves up and down along the lower slide (8). The upper extrusion roller (5) and the lower extrusion roller (7) are staggered relative to each other and form an "S" shaped roller gap, through which the strip (12) passes; The electrical control system achieves squeezing through control elements.

2. The driveless squeezing device based on the compensation algorithm as described in claim 1, characterized in that, The electrical control system has a built-in dynamic force compensation algorithm module.

3. The driveless squeezing device based on the compensation algorithm as described in claim 2, characterized in that, The dynamic force compensation algorithm module is configured as follows: based on the set target pressure F s It calculates and compensates in real time for the gravity G and the sliding friction F of the guide rail on the upper squeezing roller unit during its movement. f and cylinder seal friction force F mf Control the output force of the upper roller drive system so that the pressure applied to the strip (12) is equal to the target pressure F. s Consistent.

4. The driveless squeezing device based on the compensation algorithm as described in claim 3, characterized in that, The upper roller drive system uses an electric proportional valve or a servo proportional valve as the pneumatic control element.

5. The driveless squeezing device based on the compensation algorithm as described in claim 1, characterized in that, Also includes: A position-force composite closed-loop control system is composed of a displacement sensor for detecting the position of the upper extrusion roll unit, a force sensor for directly measuring the force on the bearing housing of the upper extrusion roll unit, and an electro-proportional valve or a servo-proportional valve.

6. The driveless squeezing device based on the compensation algorithm as described in claim 2, characterized in that, The algorithm logic of the dynamic force compensation algorithm module includes: a pressing process, a steady-state process, and a lifting process; Clamping process: Cylinder output force F cyd =F s +F f +F mf -G; Steady-state process: Cylinder output force F cys =F s +F f +F mf -G; Lifting process: Cylinder output force F cyu =F f +F mf +G.

7. A control method for a driveless squeezing device based on a compensation algorithm as described in claim 1, characterized in that, Includes the following steps: Step S1, parameter calibration: Under no-load conditions, drive the upper extrusion roller unit to rise and fall multiple times throughout its entire stroke. By collecting cylinder pressure and displacement data, calculate the guide rail friction force F at different positions. f Friction force F with cylinder seal mf The overall resistance curve is obtained and stored in the control system; Step S2, Initial Adjustment: Adjust the lower extrusion roller unit to the predetermined reference height according to the strip thickness and process requirements; Step S3, Process Setting: Input the target net extrusion pressure F s ; Step S4, rapid approach: control the upper extrusion roller unit to rapidly descend to a preset position close to the surface of the strip (12); Step S5, Precision Pressing: Switch to upper roller force control mode, according to formula F cyd =F s +F f +F mf -G calculates and controls the cylinder output force in real time, so that the upper squeezing roller (5) gently contacts and presses the strip (12) until the net pressure acting on the strip (12) reaches F. s ; Step S6, steady-state extrusion: During the operation of the strip (12), according to the compensation formula F cys =F s +F f +F mf -G adjusts the cylinder pressure to maintain a net extrusion pressure of F. s ; Step S7, process ends: According to formula F cyu =F f +F mf +G controls the output force of the cylinder to lift the upper extrusion roller unit.

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