An automatic control system and control method for the overlapping amount of a straightening machine

Abstract

The present invention discloses an automatic control system and control method for the overlapping amount of a straightening machine, comprising a control component, an entry operator side servo cylinder, an entry drive side servo cylinder, an exit operator side servo cylinder, an exit drive side servo cylinder, a balance cylinder and a frame. The upper ends of the entry operator side servo cylinder, the entry drive side servo cylinder, the exit operator side servo cylinder, the exit drive side servo cylinder and the balance cylinder are respectively fixed on the frame, and the frame is fixed on the top of the straightening machine. The lower ends of the entry operator side servo cylinder, the entry drive side servo cylinder, the exit operator side servo cylinder, the exit drive side servo cylinder are respectively connected to the four corners of the upper end face of the upper roll system, and the lower end of the balance cylinder is connected to the middle part of the upper end face of the upper roll system. The entry operator side servo cylinder, the entry drive side servo cylinder, the exit operator side servo cylinder, the exit drive side servo cylinder and the balance cylinder are respectively connected to the control component.

Description

Technical Field

[0001] The present invention belongs to the technical field of roller straightening machine control, and particularly relates to the overlapping amount control technology of roller straightening machines used in finishing, leveling and other units in the sheet production workshop of iron and steel plants in the iron and steel field, and more particularly to an automatic control system and control method for the overlapping amount of a straightening machine. Background Art

[0002] In finishing, leveling, pickling, acid rolling and other units in the sheet production workshop of iron and steel plants in the iron and steel field, roller straightening machines are often used to improve the sheet shape quality of products or enable raw materials to smoothly enter the next process. The prior art usually uses a reduction motor to drive a worm and worm gear lift to control the overlapping amount of the straightening machine. The defects of this technology are as follows: 1) The pressing system is a rigid system. When a steel plate outside the range enters the straightening machine, the straightening pressure increases, sometimes exceeding the bearing capacity of the straightening machine. However, this system cannot recognize this state, cannot protect the equipment, and is very likely to damage the equipment, causing significant losses; 2) The straightening pressure cannot be measured in real time, which is not convenient for production management; 3) The control accuracy of the existing control system for controlling the overlapping amount of the roller straightening machine is not high. The technology of the present invention can solve the above disadvantages and meet the market demand. Summary of the Invention

[0003] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide an automatic control system and control method for the overlapping amount of a straightening machine, which overcome the following problems in the prior art: 1) The pressing system is a rigid system. When a steel plate outside the range enters the straightening machine, the straightening pressure increases, sometimes exceeding the bearing capacity of the straightening machine. However, this system cannot recognize this state, cannot protect the equipment, and is very likely to damage the equipment, causing significant losses; 2) The straightening pressure cannot be measured in real time, which is not convenient for production management; 3) The control accuracy of the existing control system for controlling the overlapping amount of the roller straightening machine is not high.

[0004] To solve the technical problem, the technical solution of the present invention is: an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system and a lower roll system. The strip steel is straightened through the roll gap formed by the upper roll system and the lower roll system. The automatic control system for the overlapping amount includes a control component, an inlet operator side servo cylinder, an inlet drive side servo cylinder, an outlet operator side servo cylinder, an outlet drive side servo cylinder, a balance cylinder, and a frame. The upper ends of the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, the outlet drive side servo cylinder, and the balance cylinder are respectively fixed to the frame. The frame is fixed to the top of the straightening machine. The lower ends of the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, and the outlet drive side servo cylinder are respectively connected to the four corners of the upper end surface of the upper roll system. The lower end of the balance cylinder is connected to the middle part of the upper end surface of the upper roll system. The inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, the outlet drive side servo cylinder, and the balance cylinder are respectively connected to the control component.

[0005] Preferably, the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, and the outlet drive side servo cylinder are respectively connected to the corresponding servo valves through pipelines. There are four servo valves. The four servo valves are respectively connected to the control component through connecting cables. Pressure sensors are provided on the oil inlet pipelines of the rodless end inner cavities of the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, and the outlet drive side servo cylinder to measure the pressure of the rodless end inner cavities of the servo cylinders. The inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder, and the outlet drive side servo cylinder are all provided with built-in displacement sensors to measure the reduction amount of the upper roll system 1.

[0006] Preferably, the rodless end of the inlet operator side servo cylinder is vertically fixed to the frame in a flange form by bolts. The rod end of the inlet operator side servo cylinder is vertically fixed to a corner of the upper end surface of the upper roll system near the inlet operator side of the straightening machine. The rodless end of the inlet drive side servo cylinder is vertically fixed to the frame in a flange form by bolts. The rod end of the inlet drive side servo cylinder is vertically fixed to a corner of the upper end surface of the upper roll system near the inlet drive side of the straightening machine. The rodless end of the outlet operator side servo cylinder is vertically fixed to the frame in a flange form by bolts. The rod end of the outlet operator side servo cylinder is vertically fixed to a corner of the upper end surface of the upper roll system near the outlet operator side of the straightening machine. The rodless end of the outlet drive side servo cylinder is vertically fixed to the frame in a flange form by bolts. The rod end of the outlet drive side servo cylinder is vertically fixed to a corner of the upper end surface of the upper roll system near the outlet drive side of the straightening machine.

[0007] Preferably, the balance cylinder is connected to a reversing valve through a pipeline. The reversing valve is connected to the control component through a connecting cable.

[0008] Preferably, there are two balance cylinders. The rodless ends of the two balance cylinders are vertically fixed to the frame in the form of a flange by bolts. The rod ends of the two balance cylinders are evenly distributed and fixed at the center position of the upper end face of the upper roll system. The balance cylinders are used to generate force to offset the weight of the upper roll system so as to accurately measure the straightening pressure.

[0009] Preferably, the control component is a single-chip microcomputer, which is used to control the descending and ascending amounts of the servo cylinders on the entrance operation side, the servo cylinders on the entrance drive side, the servo cylinders on the exit operation side, the servo cylinders on the exit drive side, and the balance cylinders.

[0010] Preferably, a control method for the automatic control system of the overlapping amount of the straightening machine as described in any one of the above items includes the following steps:

[0011] Step 1) Calibrate the "zero position" state, the "open roll gap" state, and the "closed roll gap" state of the automatic control system of the overlapping amount of the straightening machine, and at the same time set the protection pressure value in the control component;

[0012] Step 2) Before the strip enters the straightening machine, the automatic control system of the overlapping amount of the straightening machine is in the "open" state. Through the control component, operate the automatic control system of the overlapping amount of the straightening machine to enter the "open roll gap" state, then enter the "closed roll gap" state, and then let the strip enter the straightening machine for straightening;

[0013] Step 3) During the straightening process, the control component continuously adjusts the opening degrees of the four servo valves so that the change amount of the overlapping amount between the upper roll system and the lower roll system does not exceed 0.05 mm. At the same time, the four pressure sensors measure the pressures in the rodless end cavities of the servo cylinders on the entrance operation side, the servo cylinders on the entrance drive side, the servo cylinders on the exit operation side, and the servo cylinders on the exit drive side in real time. The sum of the measured values of the four pressure sensors is the straightening pressure. When the straightening pressure is greater than the set protection pressure value, the automatic control system of the overlapping amount of the straightening machine quickly enters the "open roll gap" state and alarms to remind the staff to check whether the straightened strip exceeds the range to protect the straightening machine from being damaged;

[0014] Step 4) When the straightening machine exits the working state, through the control component, operate the automatic control system of the overlapping amount of the straightening machine to enter the "open" state. At this time, the system will first enter the "open roll gap" state and then enter the "open" state, and the upper roll system and the lower roll system are completely separated.

[0015] Preferably, the "zero position" state means confirming the zero position of the automatic control system of the overlapping amount of the straightening machine as the adjustment reference. In the "zero position" state, at this time, the piston rods of the servo cylinders on the entrance operation side, the servo cylinders on the entrance drive side, the servo cylinders on the exit operation side, and the servo cylinders on the exit drive side extend so that the overlapping amount between the upper roll system and the lower roll system is zero;

[0016] The "open" state means that the upper roll system rises to the highest position. At this time, the piston rods of the servo cylinders on the entrance operation side, entrance drive side, exit operation side, and exit drive side are fully retracted;

[0017] The "open roll gap" state means that the roll gap reaches the set roll gap value, which is 2 mm to 3 mm larger than the maximum thickness of the strip that the straightening machine can straighten. At this time, the piston rods of the servo cylinders on the entrance operation side, entrance drive side, exit operation side, and exit drive side extend;

[0018] The "closed roll gap" state means that the roll gap disappears. At this time, the straightening rolls in the upper roll system and the lower roll system overlap each other, generating an overlap amount, which is set by the control component.

[0019] Preferably, the calibration method for the "zero position" state is as follows: Place the calibration plate between the upper roll system and the lower roll system. Control the piston rods of the servo cylinders on the entrance operation side, entrance drive side, exit operation side, and exit drive side to extend, causing the upper roll system to descend, making the straightening rolls in the upper roll system contact the upper surface of the calibration plate, and confirm that there is no gap at the four places of the entrance side, exit side, operation side, and drive side of the upper roll system contacting the calibration plate. Read and record the measured value of the displacement sensor from the control component. Subtract the thickness value of the calibration plate from this measured value to obtain the zero position. Operate the control component to record this position, which serves as the basis for controlling the overlap amount;

[0020] The calibration method for the "open roll gap" state is as follows: Set the required "open roll gap" value in the control component and make the control component record the "open roll gap" value;

[0021] The calibration method for the "closed roll gap" state is as follows: Set the required overlap amount in the control component and make the control component record this overlap amount.

[0022] Preferably, when the overlap amount automatic control system of the straightening machine enters the "open roll gap" state from the "open" state, the control component controls the opening degree of the servo valve to be larger and the pressing speed of the upper roll system to be faster. When entering the "closed roll gap" state from the "open roll gap" state, the control component controls the opening degree of the servo valve to be smaller and the pressing speed of the upper roll system to be slower, so as to improve the control accuracy of the overlap amount.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] (1) The automatic control system for the overlapping amount of the straightening machine of the present invention includes a control component, an inlet operator side servo cylinder, an inlet drive side servo cylinder, an outlet operator side servo cylinder, an outlet drive side servo cylinder, a balance cylinder and a frame. The upper ends of each cylinder are respectively fixed on the frame, and the frame is fixed on the top of the straightening machine. The lower ends of the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder and the outlet drive side servo cylinder are respectively connected to the four corners of the upper end surface of the upper roll system. The lower end of the balance cylinder is connected to the middle part of the upper end surface of the upper roll system. Each cylinder is respectively connected to the control component. The present invention can accurately control the overlapping amount of the straightening machine, and the control accuracy can reach 0.05 mm. When the straightened material exceeds the range, it can be judged according to the straightening pressure, so that the upper roll system and the lower roll system are disengaged and do not contact the straightened material, achieving the purpose of protecting the straightening machine. In addition, the present invention can online and real-time detect the magnitude of the straightening pressure, which is convenient for production management;

[0025] (2) The inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder and the outlet drive side servo cylinder of the automatic control system for the overlapping amount of the straightening machine of the present invention can drive the upper roll system to lift and lower, and the lower roll system is fixed. The overlapping amount of the straightening machine is formed by the spacing between the upper roll system and the lower roll system. The magnitude of the lifting amount of the upper roll system determines the size of the roll gap or the overlapping amount. When in use, the straightened material passes through the roll gap formed by the upper roll system and the lower roll system, which can significantly improve the shape of the straightened material and fully release the internal residual stress;

[0026] (3) The automatic control system for the overlapping amount of the straightening machine of the present invention also has a pressure sensor for measuring the pressure in the rodless end inner cavity of the servo cylinder of the cylinder, and each servo cylinder is designed with a built-in displacement sensor for measuring the pressing amount of the upper roll system. And a balance cylinder is provided between the frame and the upper roll system to offset the weight of the upper roll system and its accessories, so as to accurately measure the straightening pressure. When the automatic control system for the overlapping amount of the straightening machine of the present invention enters the "open roll gap" state from the "open" state, the control component controls the opening degree of the servo valve to be larger, and the pressing speed of the upper roll system is faster. When entering the "closed roll gap" state from the "open roll gap" state, the control component controls the opening degree of the servo valve to be smaller, and the pressing speed of the upper roll system is slower, so as to improve the control accuracy of the overlapping amount;

[0027] (4) The present invention has a simple structure, is easy to use, has good control effect, strong practicability, low combined cost, and is safe and reliable during the operation process. The present invention can be used for the roll-type straightening machine with the strip steel thickness of 3.0 mm to 25 mm and the speed of 30 m / min to 200 m / min. Brief Description of the Drawings

[0028] Figure 1 The control principle diagram of an automatic control system for the overlapping amount of a straightening machine of the present invention;

[0029] Figure 2 , Schematic installation diagram of an automatic control system for overlapping amount of a straightening machine of the present invention on the straightening machine;

[0030] Figure 3 , The present invention Figure 2 View A of;

[0031] Figure 4 , Schematic diagram of roll arrangement of an automatic control system for overlapping amount of a straightening machine of the present invention;

[0032] Figure 5 , Schematic diagram for calibrating the "zero position" state of an automatic control system for overlapping amount of a straightening machine of the present invention.

[0033] Description of reference numerals

[0034] 1 - upper roll system, 2 - strip steel, 3 - lower roll system, 4 - control component, 5 - connecting cable, 6 - servo valve, 7 - pipeline, 8 - pressure sensor, 9 - servo cylinder on the entrance operation side, 10 - displacement sensor, 11 - servo cylinder on the entrance drive side, 12 - servo cylinder on the exit operation side, 13 - servo cylinder on the exit drive side, 14 - balance cylinder, 15 - frame, 16 - calibration plate, 17 - straightening roll, 18 - reversing valve. Specific embodiments

[0035] The following describes the specific embodiments of the present invention in conjunction with the embodiments:

[0036] It should be noted that the structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0037] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0038] Embodiment 1

[0039] Such as Figure 1 , 4As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an inlet operator side servo cylinder 9, an inlet driver side servo cylinder 11, an outlet operator side servo cylinder 12, an outlet driver side servo cylinder 13, a balance cylinder 14, and a frame 15. The upper ends of the inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet driver side servo cylinder 13, and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, and the outlet driver side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet driver side servo cylinder 13, and the balance cylinder 14 are respectively connected to the control component 4.

[0040] Embodiment 2

[0041] As Figure 1 、 4 As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an inlet operator side servo cylinder 9, an inlet driver side servo cylinder 11, an outlet operator side servo cylinder 12, an outlet driver side servo cylinder 13, a balance cylinder 14, and a frame 15. The upper ends of the inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet driver side servo cylinder 13, and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, and the outlet driver side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The inlet operator side servo cylinder 9, the inlet driver side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet driver side servo cylinder 13, and the balance cylinder 14 are respectively connected to the control component 4.

[0042] Preferably, as Figure 1As shown, the inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, and outlet drive side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6, and the four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, and outlet drive side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. The inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, and outlet drive side servo cylinder 13 are all provided with built-in displacement sensors 10 to measure the reduction amount of the upper roll system 1.

[0043] Embodiment 3

[0044] As Figure 1 、 4 As shown, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an inlet operation side servo cylinder 9, an inlet drive side servo cylinder 11, an outlet operation side servo cylinder 12, an outlet drive side servo cylinder 13, a balance cylinder 14, and a frame 15. The upper ends of the inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, outlet drive side servo cylinder 13, and balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, and outlet drive side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The inlet operation side servo cylinder 9, inlet drive side servo cylinder 11, outlet operation side servo cylinder 12, outlet drive side servo cylinder 13, and balance cylinder 14 are respectively connected to the control component 4.

[0045] Preferably, as Figure 1As shown, the inlet operation side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operation side servo cylinder 12, and the outlet drive side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6, and the four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the inlet operation side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operation side servo cylinder 12, and the outlet drive side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. Displacement sensors 10 are built in the inlet operation side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operation side servo cylinder 12, and the outlet drive side servo cylinder 13 to measure the reduction amount of the upper roll system 1.

[0046] Preferably, as Figure 2 , 3 shown, the rodless end of the inlet operation side servo cylinder 9 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the inlet operation side servo cylinder 9 is vertically fixed to a corner of the upper end face of the upper roll system 1 near the inlet operation side of the straightening machine. The rodless end of the inlet drive side servo cylinder 11 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the inlet drive side servo cylinder 11 is vertically fixed to a corner of the upper end face of the upper roll system 1 near the inlet drive side of the straightening machine. The rodless end of the outlet operation side servo cylinder 12 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the outlet operation side servo cylinder 12 is vertically fixed to a corner of the upper end face of the upper roll system 1 near the outlet operation side of the straightening machine. The rodless end of the outlet drive side servo cylinder 13 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the outlet drive side servo cylinder 13 is vertically fixed to a corner of the upper end face of the upper roll system 1 near the outlet drive side of the straightening machine.

[0047] Example 4

[0048] As Figure 1 , 4As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an entrance operator side servo cylinder 9, an entrance driver side servo cylinder 11, an exit operator side servo cylinder 12, an exit driver side servo cylinder 13, a balance cylinder 14 and a frame 15. The upper ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13 and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13 and the balance cylinder 14 are respectively connected to the control component 4.

[0049] Preferably, as Figure 1 shown, the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6. The four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. Displacement sensors 10 are built in the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 to measure the reduction amount of the upper roll system 1.

[0050] Preferably, as Figure 2 、 3As shown, the rodless end of the entrance operation side servo oil cylinder 9 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance operation side servo oil cylinder 9 is vertically fixed to a corner of the upper roll system 1 close to the entrance operation side of the straightening machine. The rodless end of the entrance drive side servo oil cylinder 11 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance drive side servo oil cylinder 11 is vertically fixed to a corner of the upper roll system 1 close to the entrance drive side of the straightening machine. The rodless end of the exit operation side servo oil cylinder 12 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit operation side servo oil cylinder 12 is vertically fixed to a corner of the upper roll system 1 close to the exit operation side of the straightening machine. The rodless end of the exit drive side servo oil cylinder 13 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit drive side servo oil cylinder 13 is vertically fixed to a corner of the upper roll system 1 close to the exit drive side of the straightening machine.

[0051] Preferably, as Figure 1 shown, the balance oil cylinder 14 is connected to the reversing valve 18 through the pipeline 7, and the reversing valve 18 is connected to the control component 4 through the connecting cable 5.

[0052] Preferably, as Figure 3 shown, there are two balance oil cylinders 14. The rodless ends of the two balance oil cylinders 14 are vertically fixed to the frame 15 in the form of a flange by bolts. The rod ends of the two balance oil cylinders 14 are evenly distributed and fixed to the center position of the upper surface of the upper roll system 1. The balance oil cylinder 14 is used to output force to offset the weight of the upper roll system 1 so as to accurately measure the straightening pressure.

[0053] Embodiment 5

[0054] As Figure 1 、 4As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an entrance operator side servo cylinder 9, an entrance driver side servo cylinder 11, an exit operator side servo cylinder 12, an exit driver side servo cylinder 13, a balance cylinder 14 and a frame 15. The upper ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13 and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 are respectively connected to the four corners of the upper end face of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end face of the upper roll system 1. The entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13 and the balance cylinder 14 are respectively connected to the control component 4.

[0055] Preferably, as Figure 1 shown, the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6. The four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. Displacement sensors 10 are built in the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12 and the exit driver side servo cylinder 13 to measure the reduction amount of the upper roll system 1.

[0056] Preferably, as Figure 2 、 3As shown, the rodless end of the entrance operation side servo oil cylinder 9 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance operation side servo oil cylinder 9 is vertically fixed to a corner of the upper roll system 1 near the entrance operation side of the straightening machine. The rodless end of the entrance drive side servo oil cylinder 11 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance drive side servo oil cylinder 11 is vertically fixed to a corner of the upper roll system 1 near the entrance drive side of the straightening machine. The rodless end of the exit operation side servo oil cylinder 12 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit operation side servo oil cylinder 12 is vertically fixed to a corner of the upper roll system 1 near the exit operation side of the straightening machine. The rodless end of the exit drive side servo oil cylinder 13 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit drive side servo oil cylinder 13 is vertically fixed to a corner of the upper roll system 1 near the exit drive side of the straightening machine.

[0057] Preferably, as Figure 1 shown, the balance oil cylinder 14 is connected to the reversing valve 18 through the pipeline 7, and the reversing valve 18 is connected to the control component 4 through the connection cable 5.

[0058] Preferably, as Figure 3 shown, there are two balance oil cylinders 14. The rodless ends of the two balance oil cylinders 14 are vertically fixed to the frame 15 in the form of a flange by bolts. The rod ends of the two balance oil cylinders 14 are evenly distributed and fixed to the center position of the upper surface of the upper roll system 1. The balance oil cylinder 14 is used to output force to offset the weight of the upper roll system 1 so as to accurately measure the straightening pressure.

[0059] Preferably, the control component 4 is a single-chip microcomputer, which is used to control the descending and ascending amounts of the entrance operation side servo oil cylinder 9, the entrance drive side servo oil cylinder 11, the exit operation side servo oil cylinder 12, the exit drive side servo oil cylinder 13 and the balance oil cylinder 14.

[0060] Example 6

[0061] As Figure 1 、 4As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an entrance operator side servo cylinder 9, an entrance driver side servo cylinder 11, an exit operator side servo cylinder 12, an exit driver side servo cylinder 13, a balance cylinder 14, and a frame 15. The upper ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13, and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, and the exit driver side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, the exit driver side servo cylinder 13, and the balance cylinder 14 are respectively connected to the control component 4.

[0062] Preferably, as Figure 1 shown, the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, and the exit driver side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6. The four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, and the exit driver side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. Displacement sensors 10 are built in the entrance operator side servo cylinder 9, the entrance driver side servo cylinder 11, the exit operator side servo cylinder 12, and the exit driver side servo cylinder 13 to measure the reduction amount of the upper roll system 1.

[0063] Preferably, as Figure 2 、 3As shown, the rodless end of the entrance operation side servo cylinder 9 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance operation side servo cylinder 9 is vertically fixed to a corner of the upper roll system 1 near the entrance operation side of the straightening machine. The rodless end of the entrance drive side servo cylinder 11 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance drive side servo cylinder 11 is vertically fixed to a corner of the upper roll system 1 near the entrance drive side of the straightening machine. The rodless end of the exit operation side servo cylinder 12 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit operation side servo cylinder 12 is vertically fixed to a corner of the upper roll system 1 near the exit operation side of the straightening machine. The rodless end of the exit drive side servo cylinder 13 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit drive side servo cylinder 13 is vertically fixed to a corner of the upper roll system 1 near the exit drive side of the straightening machine.

[0064] Preferably, as Figure 1 shown, the balance cylinder 14 is connected to the reversing valve 18 through the pipeline 7, and the reversing valve 18 is connected to the control component 4 through the connecting cable 5.

[0065] Preferably, as Figure 3 shown, there are two balance cylinders 14. The rodless ends of the two balance cylinders 14 are vertically fixed to the frame 15 in the form of a flange by bolts. The rod ends of the two balance cylinders 14 are evenly distributed and fixed to the center position of the upper surface of the upper roll system 1. The balance cylinder 14 is used to output force to offset the weight of the upper roll system 1 so as to accurately measure the straightening pressure.

[0066] Preferably, the control component 4 is a single-chip microcomputer, which is used to control the descending and ascending amounts of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, the exit drive side servo cylinder 13 and the balance cylinder 14.

[0067] Preferably, a control method for the automatic control system of the overlapping amount of the straightening machine as described in any one of the above includes the following steps:

[0068] Step 1) Calibrate the "zero position" state, "open roll gap" state and "closed roll gap" state of the automatic control system of the overlapping amount of the straightening machine, and set the protection pressure value in the control component 4 at the same time;

[0069] Step 2) Before the strip steel 2 enters the straightening machine, the automatic control system of the overlapping amount of the straightening machine is in the "open" state. The automatic control system of the overlapping amount of the straightening machine is operated through the control component 4 to enter the "open roll gap" state, then enter the "closed roll gap" state, and then let the strip steel 2 enter the straightening machine for straightening;

[0070] Step 3) During the straightening process, the control component 4 continuously adjusts the opening degrees of the four servo valves 6 so that the change in the overlapping amount of the upper roll system 1 and the lower roll system 3 does not exceed 0.05 mm. At the same time, the four pressure sensors 8 measure the pressures in the rodless inner cavities of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 in real time. The sum of the measured values of the four pressure sensors 8 is the straightening pressure. When the straightening pressure is greater than the set protection pressure value, the overlapping amount automatic control system of the straightening machine quickly enters the "open roll gap" state and alarms to remind the staff to check whether the strip steel 2 to be straightened exceeds the range, protecting the straightening machine from damage;

[0071] Step 4) When the straightening machine exits the working state, the overlapping amount automatic control system of the straightening machine is operated through the control component 4 to enter the "open" state. At this time, the system will first enter the "open roll gap" state and then enter the "open" state, and the upper roll system 1 and the lower roll system 3 are completely separated.

[0072] Preferably, in the "zero position" state, that is, the zero position of the overlapping amount automatic control system of the straightening machine is confirmed as the adjustment reference. In the "zero position" state, at this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 extend so that the overlapping amount of the upper roll system 1 and the lower roll system 3 is zero;

[0073] In the "open" state, that is, the upper roll system 1 rises to the highest position. At this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 are fully retracted;

[0074] In the "open roll gap" state, that is, the roll gap reaches the set roll gap value, which is 2 mm to 3 mm larger than the maximum thickness of the strip steel 2 that the straightening machine can straighten. At this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 extend;

[0075] In the "closed roll gap" state, that is, the roll gap disappears. At this time, the straightening rolls 17 in the upper roll system 1 and the lower roll system 3 overlap with each other, generating an overlapping amount, and this overlapping amount is set by the control component 4.

[0076] Embodiment 7

[0077] As Figure 1 、 4As shown in the figure, the present invention discloses an automatic control system for the overlapping amount of a straightening machine. The straightening machine includes an upper roll system 1 and a lower roll system 3. The strip steel 2 is straightened through the roll gap formed by the upper roll system 1 and the lower roll system 3. The automatic control system for the overlapping amount includes a control component 4, an inlet operator side servo cylinder 9, an inlet drive side servo cylinder 11, an outlet operator side servo cylinder 12, an outlet drive side servo cylinder 13, a balance cylinder 14 and a frame 15. The upper ends of the inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet drive side servo cylinder 13 and the balance cylinder 14 are respectively fixed on the frame 15. The frame 15 is fixed on the top of the straightening machine. The lower ends of the inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12 and the outlet drive side servo cylinder 13 are respectively connected to the four corners of the upper end surface of the upper roll system 1. The lower end of the balance cylinder 14 is connected to the middle part of the upper end surface of the upper roll system 1. The inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12, the outlet drive side servo cylinder 13 and the balance cylinder 14 are respectively connected to the control component 4.

[0078] Preferably, as Figure 1 shown, the inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12 and the outlet drive side servo cylinder 13 are respectively connected to the corresponding servo valves 6 through pipelines 7. There are four servo valves 6. The four servo valves 6 and the control component 4 are respectively connected through connection cables 5. Pressure sensors 8 are provided on the oil inlet pipelines of the rodless end inner cavities of the inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12 and the outlet drive side servo cylinder 13 to measure the pressure of the rodless end inner cavities of the servo cylinders. Displacement sensors 10 are built in the inlet operator side servo cylinder 9, the inlet drive side servo cylinder 11, the outlet operator side servo cylinder 12 and the outlet drive side servo cylinder 13 to measure the reduction amount of the upper roll system 1.

[0079] Preferably, as Figure 2 、 3As shown, the rodless end of the entrance operation side servo oil cylinder 9 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance operation side servo oil cylinder 9 is vertically fixed to a corner of the upper roll system 1 close to the entrance operation side of the straightening machine. The rodless end of the entrance drive side servo oil cylinder 11 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the entrance drive side servo oil cylinder 11 is vertically fixed to a corner of the upper roll system 1 close to the entrance drive side of the straightening machine. The rodless end of the exit operation side servo oil cylinder 12 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit operation side servo oil cylinder 12 is vertically fixed to a corner of the upper roll system 1 close to the exit operation side of the straightening machine. The rodless end of the exit drive side servo oil cylinder 13 is vertically fixed to the frame 15 in the form of a flange by bolts. The rod end of the exit drive side servo oil cylinder 13 is vertically fixed to a corner of the upper roll system 1 close to the exit drive side of the straightening machine.

[0080] Preferably, as Figure 1 shown, the balance oil cylinder 14 is connected to the reversing valve 18 through the pipeline 7, and the reversing valve 18 is connected to the control component 4 through the connection cable 5.

[0081] Preferably, as Figure 3 shown, there are two balance oil cylinders 14. The rodless ends of the two balance oil cylinders 14 are vertically fixed to the frame 15 in the form of a flange by bolts. The rod ends of the two balance oil cylinders 14 are evenly distributed and fixed to the center position of the upper surface of the upper roll system 1. The balance oil cylinder 14 is used to output force to offset the weight of the upper roll system 1 so as to accurately measure the straightening pressure.

[0082] Preferably, the control component 4 is a single-chip microcomputer, which is used to control the descending and ascending amounts of the entrance operation side servo oil cylinder 9, the entrance drive side servo oil cylinder 11, the exit operation side servo oil cylinder 12, the exit drive side servo oil cylinder 13 and the balance oil cylinder 14.

[0083] Preferably, a control method for the automatic control system of the overlapping amount of the straightening machine as described in any one of the above is as follows:

[0084] Step 1) Calibrate the "zero position" state, "open roll gap" state and "closed roll gap" state of the automatic control system of the overlapping amount of the straightening machine, and set the protection pressure value in the control component 4 at the same time;

[0085] Step 2) Before the strip 2 enters the straightening machine, the automatic control system of the overlapping amount of the straightening machine is in the "open" state. The automatic control system of the overlapping amount of the straightening machine is operated through the control component 4 to enter the "open roll gap" state, then enter the "closed roll gap" state, and then let the strip 2 enter the straightening machine for straightening;

[0086] Step 3) During the straightening process, the control component 4 continuously adjusts the opening degrees of the four servo valves 6 so that the change in the overlapping amount between the upper roll system 1 and the lower roll system 3 does not exceed 0.05 mm. At the same time, the four pressure sensors 8 measure the pressures in the rodless cavities of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 in real time. The sum of the measured values of the four pressure sensors 8 is the straightening pressure. When the straightening pressure is greater than the set protection pressure value, the automatic control system for the overlapping amount of the straightening machine quickly enters the "open roll gap" state and alarms to remind the staff to check whether the straightened strip steel 2 exceeds the range, protecting the straightening machine from damage;

[0087] Step 4) When the straightening machine exits the working state, the control component 4 is used to operate the automatic control system for the overlapping amount of the straightening machine to enter the "open" state. At this time, the system will first enter the "open roll gap" state and then enter the "open" state, and the upper roll system 1 and the lower roll system 3 are completely separated.

[0088] Preferably, in the "zero position" state, that is, the zero position of the automatic control system for the overlapping amount of the straightening machine is confirmed as the adjustment reference. In the "zero position" state, at this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 extend so that the overlapping amount between the upper roll system 1 and the lower roll system 3 is zero;

[0089] In the "open" state, that is, the upper roll system 1 rises to the highest position, and at this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 are fully retracted;

[0090] In the "open roll gap" state, that is, the roll gap reaches the set roll gap value, and this roll gap value is 2 mm to 3 mm larger than the maximum thickness of the strip steel 2 that the straightening machine can straighten. At this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 extend;

[0091] In the "closed roll gap" state, that is, the roll gap disappears. At this time, the straightening rolls 17 in the upper roll system 1 and the lower roll system 3 overlap with each other, generating an overlapping amount, and this overlapping amount is set by the control component 4.

[0092] Preferably, as Figure 5As shown in the figure, the calibration method for the "zero position" state is as follows: Place the calibration plate 16 between the upper roll system 1 and the lower roll system 3. Control the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12, and the exit drive side servo cylinder 13 to extend, causing the upper roll system 1 to descend, making the leveling rolls 17 in the upper roll system 1 contact the upper surface of the calibration plate 16, and confirm that there is no gap at the four locations of the entrance side, exit side, operation side, and drive side of the upper roll system 1 with the calibration plate 16. Read and record the measurement value of the displacement sensor 10 from the control component 4. Subtract the thickness value of the calibration plate 16 from this measurement value, and the result is the zero position. Operate the control component 4 to record this position, which is used as the benchmark for controlling the overlap amount.

[0093] The calibration method for the "open roll gap" state is as follows: Set the required "open roll gap" value in the control component 4, and make the control component 4 record the "open roll gap" value.

[0094] The calibration method for the "closed roll gap" state is as follows: Set the required overlap amount in the control component 4, and make the control component 4 record this overlap amount.

[0095] Preferably, when the overlap amount automatic control system of the leveling machine enters the "open roll gap" state from the "open" state, the control component 4 controls the opening degree of the servo valve 6 to be larger, and the descending speed of the upper roll system 1 is faster. When entering the "closed roll gap" state from the "open roll gap" state, the control component 4 controls the opening degree of the servo valve 6 to be smaller, and the descending speed of the upper roll system 1 is slower, so as to improve the control accuracy of the overlap amount.

[0096] As Figure 3 shown, the upper end surface of the upper roll system 1 is variable, that is, it varies according to the requirements of the oil cylinder position and strength, so it does not affect the installation of the oil cylinder.

[0097] The working principle of the present invention is as follows:

[0098] As Figure 1 shown, before the steel plate to be leveled enters the leveling machine configured in the present invention, the overlap amount automatic control system of the leveling machine is in the "open" state. Operate the overlap amount automatic control system of the leveling machine through the control component 4 to enter the "open roll gap" state, and then enter the "closed roll gap" state. At the same time, set the protection pressure value, and then let the steel plate to be leveled enter the leveling machine for leveling. During the leveling process, the control component 4 continuously adjusts the opening degree of the servo valve 6 to make the change amount of the overlap amount not exceed 0.05 mm. At the same time, the pressure sensor 8 measures the pressure in the inner cavity of the rodless end of each servo cylinder in real time. The sum of the measurement values of the four pressure sensors is the leveling pressure. When the leveling pressure is greater than the above-set protection pressure value, the system quickly enters the "open roll gap" state and alarms to remind the staff to check whether the steel plate to be leveled exceeds the range, and also further protects the leveling machine from being damaged.

[0099] When the straightening exits the working state, the straightening machine is operated by the control component 4 to enter the "open" state. At this time, the system will first enter the "open roll gap" state and then enter the "open" state, and the upper roll system 1 and the lower roll system 3 are completely separated.

[0100] When the system enters the "open roll gap" state from the "open" state, the control component 4 controls the opening degree of the servo valve 6 to be larger, and the pressing speed of the upper roll system 1 is faster. When entering the "closed roll gap" state from the "open roll gap" state, the control component 4 controls the opening degree of the servo valve 6 to be smaller, and the pressing speed of the upper roll system 1 is slower, so as to improve the control accuracy of the overlap amount.

[0101] The following preparatory work needs to be done when the present invention works for the first time:

[0102] 1. Zero the system, that is, calibrate the "zero position" state. The "zero position" state means confirming the zero position of the automatic control system of the overlap amount of the straightening machine as the adjustment reference. In the "zero position" state, at this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12 and the exit drive side servo cylinder 13 extend, so that the overlap amount between the upper roll system 1 and the lower roll system 3 is zero;

[0103] The calibration method of the "zero position" state is: place the calibration plate 16 between the upper roll system 1 and the lower roll system 3, control the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12 and the exit drive side servo cylinder 13 to extend, so that the upper roll system 1 descends, and make the straightening roll 17 in the upper roll system 1 contact the upper surface of the calibration plate 16, and confirm that there is no gap at the four places of the entrance side, the exit side, the operation side and the drive side of the upper roll system 1 contacting the calibration plate 16. Read and record the measured value of the displacement sensor 10 from the control component 4. Subtract the thickness value of the calibration plate 16 from this measured value to obtain the zero position. Operate the control component 4 to record this position, which is used as the reference for controlling the overlap amount.

[0104] 2. Set the "open" state. The "open" state means that the upper roll system 1 rises to the highest position. At this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12 and the exit drive side servo cylinder 13 are completely retracted.

[0105] 3. Calibrate the "open roll gap" state. The "open roll gap" state means that the roll gap reaches the set roll gap value, and this roll gap value is 2 mm to 3 mm larger than the maximum thickness of the strip steel 2 that the straightening machine can straighten. At this time, the piston rods of the entrance operation side servo cylinder 9, the entrance drive side servo cylinder 11, the exit operation side servo cylinder 12 and the exit drive side servo cylinder 13 extend; the calibration method of the "open roll gap" state is: set the required "open roll gap" value in the control component 4, and make the control component 4 record the "open roll gap" value.

[0106] 4. Calibrate the "closed roll gap" state. The "closed roll gap" state means that the roll gap disappears. At this time, the leveling rolls 17 in the upper roll system 1 and the lower roll system 3 overlap with each other, generating an overlap amount, which is set by the control component 4. The calibration method for the "closed roll gap" state is: set the required overlap amount in the control component 4 and make the control component 4 record this overlap amount.

[0107] 5. Calculate and debug the hydraulic oil pressure leading to the rod end inner cavity of the balance cylinder 14 to exactly balance the weight of the upper roll system 1 and its accessories.

[0108] The automatic control system for the overlap amount of the leveling machine of the present invention includes a control component, an inlet operator side servo cylinder, an inlet drive side servo cylinder, an outlet operator side servo cylinder, an outlet drive side servo cylinder, a balance cylinder and a frame. The upper ends of each cylinder are respectively fixed on the frame, and the frame is fixed on the top of the leveling machine. The lower ends of the inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder and the outlet drive side servo cylinder are respectively connected to the four corners of the upper end surface of the upper roll system. The lower end of the balance cylinder is connected to the middle part of the upper end surface of the upper roll system. Each cylinder is respectively connected to the control component. The present invention can accurately control the overlap amount of the leveling machine, and the control accuracy can reach 0.05 mm. When the straightened material exceeds the range, it can be judged according to the leveling pressure, so that the upper roll system and the lower roll system are disengaged and do not contact the straightened material, achieving the purpose of protecting the leveling machine. In addition, the present invention can online and real-time detect the magnitude of the leveling pressure, which is convenient for production management.

[0109] The inlet operator side servo cylinder, the inlet drive side servo cylinder, the outlet operator side servo cylinder and the outlet drive side servo cylinder of the automatic control system for the overlap amount of the leveling machine of the present invention can drive the upper roll system to lift and lower, and the lower roll system is fixed. The overlap amount of the leveling machine is formed by the distance between the upper roll system and the lower roll system. The magnitude of the lifting and lowering amount of the upper roll system determines the size of the roll gap or the overlap amount. When in use, the straightened material passes through the roll gap formed by the upper roll system and the lower roll system, which can significantly improve the shape of the straightened material and fully release the internal residual stress.

[0110] The automatic control system for the overlap amount of the leveling machine of the present invention also has a pressure sensor for measuring the pressure in the rodless end inner cavity of the servo cylinder of the oil cylinder, and each servo cylinder is designed with an internal displacement sensor for measuring the pressing amount of the upper roll system. And a balance cylinder is provided between the frame and the upper roll system to offset the weight of the upper roll system and its accessories, so as to accurately measure the leveling pressure. When the automatic control system for the overlap amount of the leveling machine of the present invention enters the "open roll gap" state from the "open" state, the control component controls the opening degree of the servo valve to be larger, and the pressing speed of the upper roll system is faster. When entering the "closed roll gap" state from the "open roll gap" state, the control component controls the opening degree of the servo valve to be smaller, and the pressing speed of the upper roll system is slower, so as to improve the control accuracy of the overlap amount.

[0111] The structure of the present invention is simple, easy to use, with good control effect, strong practicability, low combination cost, and safe and reliable during operation. The present invention can be used in roll straightening machines for straightening strip steel with a thickness of 3.0 mm to 25 mm and a speed of 30 meters per minute to 200 meters per minute.

[0112] The above has made a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge scope of those of ordinary skill in the art.

[0113] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A control method for an automatic control system for overlap of a straightening machine, characterized in that: The following steps are involved: Step 1) calibrating the "zero position" state, "open roll gap" state, and "closed roll gap" state of the straightening machine overlap automatic control system, and setting the protection pressure value in the control component (4); Step 2) Before the steel strip (2) enters the straightening machine, the overlap amount automatic control system of the straightening machine is in the "open" state, and the overlap amount automatic control system of the straightening machine is operated by the control component (4) to enter the "open roll gap" state, and then enter the "closed roll gap" state, and then the steel strip (2) enters the straightening machine for straightening; Step 3) During the straightening process, the control component (4) continuously adjusts the opening of the four servo valves (6) so that the change in the overlap amount of the upper roller system (1) and the lower roller system (3) does not exceed 0.05 mm. At the same time, the four pressure sensors (8) measure the pressure of the rod end inner cavity of the inlet and outlet operation side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operation side servo cylinder (12) and the outlet transmission side servo cylinder (13) in real time. The sum of the measured values of the four pressure sensors (8) is the straightening pressure. When the straightening pressure is greater than the set protection pressure value, the overlap amount automatic control system of the straightening machine quickly enters the "roll gap open" state and alarms to remind the staff to check whether the straightened strip steel (2) is out of range, thereby protecting the straightening machine from damage. Step 4) When the straightening machine exits the working state, the overlap automatic control system of the straightening machine is operated by the control component (4) to enter the "open" state. At this time, the system will first enter the "roller gap open" state and then enter the "open" state, and the upper roller system (1) and the lower roller system (3) are completely separated; The straightening machine overlap automatic control system comprises a control component (4), an inlet operation side servo oil cylinder (9), an inlet transmission side servo oil cylinder (11), an outlet operation side servo oil cylinder (12), an outlet transmission side servo oil cylinder (13), a balancing oil cylinder (14) and a frame (15), wherein the upper ends of the inlet operation side servo oil cylinder (9), the inlet transmission side servo oil cylinder (11), the outlet operation side servo oil cylinder (12), the outlet transmission side servo oil cylinder (13) and the balancing oil cylinder (14) are respectively fixed to the frame (15). 5), wherein the frame (15) is fixed on the top of the straightening machine, the lower ends of the inlet operation side servo oil cylinder (9), the inlet transmission side servo oil cylinder (11), the outlet operation side servo oil cylinder (12), and the outlet transmission side servo oil cylinder (13) are respectively connected to the four corners of the upper end surface of the upper roller system (1), wherein the lower end of the balancing oil cylinder (14) is connected to the middle part of the upper end surface of the upper roller system (1), the inlet operation side servo oil cylinder (9), the inlet transmission side servo oil cylinder (11), the outlet operation side servo oil cylinder (12), and the outlet transmission side servo oil cylinder (13) are respectively connected to the four corners of the upper end surface of the upper roller system (1), and the lower end of the balancing oil cylinder (14) is connected to the middle part of the upper end surface of the upper roller system (1). The moving side servo oil cylinder (13) and the balancing oil cylinder (14) are respectively connected to the control assembly (4); the inlet operation side servo oil cylinder (9), the inlet transmission side servo oil cylinder (11), the outlet operation side servo oil cylinder (12) and the outlet transmission side servo oil cylinder (13) are respectively connected to the corresponding servo valves (6) through pipelines (7), and there are four servo valves (6), wherein the four servo valves (6) are respectively connected to the control assembly (4) through connecting cables (5). Pressure sensors (8) are provided on the oil inlet lines of the rodless end inner cavities of the servo cylinder (11), the outlet operation side servo cylinder (12) and the outlet transmission side servo cylinder (13) for measuring the pressure of the rodless end inner cavities of the servo cylinders, wherein the inlet operation side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operation side servo cylinder (12) and the outlet transmission side servo cylinder (13) are provided with built-in displacement sensors (10) for measuring the pressing amount of the upper roller system (1); the lower roller system (3) is fixed.

2. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that The "zero position" state is to confirm the zero position of the straightening machine overlap automatic control system as the reference for adjustment. In the "zero position" state, the piston rods of the inlet operating side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operating side servo cylinder (12) and the outlet transmission side servo cylinder (13) are extended to make the overlap between the upper roller system (1) and the lower roller system (3) zero; The "open" state is when the upper roller system (1) is raised to the highest position, and the piston rods of the inlet operating side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operating side servo cylinder (12) and the outlet transmission side servo cylinder (13) are completely retracted; The "open roll gap" state is when the roll gap reaches a set roll gap value, which is 2 mm to 3 mm greater than the maximum thickness of the steel strip (2) that can be straightened by the straightening machine, and at this time, the piston rods of the inlet operating side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operating side servo cylinder (12) and the outlet transmission side servo cylinder (13) extend; The "closed roll gap" state, i.e., the roll gap disappears, is when the straightening rolls (17) in the upper roll system (1) and the lower roll system (3) overlap with each other, resulting in an overlap amount, which is set by the control component (4).

3. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that The calibration method of the "zero position" state is as follows: placing the calibration plate (16) between the upper roller system (1) and the lower roller system (3), controlling the piston rods of the inlet operation side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operation side servo cylinder (12) and the outlet transmission side servo cylinder (13) to extend, so that the upper roller system (1) is lowered, and the straightening roller (17) in the upper roller system (1) is in contact with the upper surface of the calibration plate (16), and confirming that the inlet side, outlet side, operation side and transmission side of the upper roller system (1) are in contact with the calibration plate (16) without gaps, reading and recording the measurement value of the displacement sensor (10) from the control component (4), and using the measurement value minus the thickness value of the calibration plate (16) to obtain the zero position, operating the control component (4) to record this position, and using it as a reference for controlling the overlap amount; The calibration method of the "roller gap opening" state is as follows: setting a required "roller gap opening" value in the control component (4), and making the control component (4) record the "roller gap opening" value; The calibration method of the "closed roll gap" state is: setting the required overlap amount in the control component (4), and making the control component (4) record the overlap amount.

4. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that When the overlap amount automatic control system of the straightening machine enters the "open roll gap" state from the "open" state, the control component (4) controls the servo valve (6) to have a larger opening degree, and the upper roller system (1) presses down at a faster speed. When the overlap amount automatic control system of the straightening machine enters the "open roll gap" state from the "open roll gap" state, the control component (4) controls the servo valve (6) to have a smaller opening degree, and the upper roller system (1) presses down at a slower speed, so as to improve the control accuracy of the overlap amount.

5. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that The rodless end of the inlet operation side servo oil cylinder (9) is vertically fixed to the frame (15) by bolts in the form of a flange, wherein the rod end of the inlet operation side servo oil cylinder (9) is vertically fixed to a corner of the upper end face of the upper roller system (1) close to the inlet operation side of the straightener, and the rodless end of the inlet transmission side servo oil cylinder (11) is vertically fixed to the frame (15) by bolts in the form of a flange, wherein the rod end of the inlet transmission side servo oil cylinder (11) is vertically fixed to a corner of the upper end face of the upper roller system (1) close to the inlet transmission side of the straightener, The rodless end of the outlet operation side servo oil cylinder (12) is vertically fixed to the frame (15) in the form of a flange by means of bolts, wherein the rod end of the outlet operation side servo oil cylinder (12) is vertically fixed to a corner of the upper end face of the upper roller system (1) close to the outlet operation side of the straightener, and the rodless end of the outlet transmission side servo oil cylinder (13) is vertically fixed to the frame (15) in the form of a flange by means of bolts, wherein the rod end of the outlet transmission side servo oil cylinder (13) is vertically fixed to a corner of the upper end face of the upper roller system (1) close to the outlet transmission side of the straightener.

6. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that The balancing oil cylinder (14) is connected to the reversing valve (18) via a pipeline (7), wherein the reversing valve (18) is connected to the control component (4) via a connecting cable (5).

7. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that There are two balancing oil cylinders (14), two of which have no rod ends and are fixed vertically to the frame (15) in the form of flanges using bolts, and two of which have rod ends and are evenly distributed and fixed to the center position of the upper end surface of the upper roller system (1). The balancing oil cylinders (14) are used to output force to offset the weight of the upper roller system (1) so as to accurately measure the straightening pressure.

8. The control method of the automatic control system of the overlap amount of the straightening machine according to claim 1, characterized in that The control component (4) is a single chip microcomputer, which is used to control the descent and ascent of the inlet operation side servo cylinder (9), the inlet transmission side servo cylinder (11), the outlet operation side servo cylinder (12), the outlet transmission side servo cylinder (13) and the balance cylinder (14).

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