A hydraulic circuit and control method for a roll edge heating device
By controlling the forward and backward movement of the heating head through a hydraulic circuit, combined with pressure and displacement sensors, the problems of inaccurate positioning and inflexible adjustment of the heating device at the edge of the roll are solved, achieving a rapid, precise, and safe heating effect from electromagnetic heating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-06-30
AI Technical Summary
Existing roll edge heating devices suffer from slow heating, inflexible position adjustment, and low positioning accuracy. In particular, electromagnetic heating schemes present operational difficulties and equipment damage risks in calibration and gap adjustment.
A hydraulic circuit for a roll edge heating device is adopted. The forward and backward movement of the heating head is controlled by the hydraulic system. Combined with pressure and displacement sensors, automatic calibration and dynamic gap adjustment are achieved to ensure the precise positioning and stability of the gap between the heating head and the roll.
It enables automatic calibration and dynamic adjustment of the gap between the heating head and the roll, improving positioning accuracy and operational safety, avoiding manual measurement errors and equipment damage, and enhancing the controllability and flexibility of the heating effect.
Smart Images
Figure CN120755186B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of non-ferrous metal processing technology, specifically to a hydraulic circuit and control method for a rolling mill edge heating device. Background Technology
[0002] The roll edge heating device is one of the important pieces of equipment in the cold rolling mill for aluminum sheet and strip. With the increasing requirements for the rolling of aluminum sheet and strip, it is required that the two sides of the work rolls be heated at the edge of the strip during the rolling process to change the roll edge convexity, so that the strip edge is less likely to form a tight edge that leads to strip breakage, thereby improving product quality and unit efficiency.
[0003] To meet the above requirements, the traditional approach is to spray hot oil on the edge of the roll. The disadvantages of this approach are that the heating is slow, which cannot meet the needs of adjustment at any time. In addition, the investment cost is high, the oil temperature requirements are relatively high, and it is difficult to implement.
[0004] Currently, electromagnetic heating is becoming increasingly popular. The basic principle is to use an electromagnetic heating head close to the area of the roll that needs heating for real-time heating. Its advantages are rapid heating and precise positioning. However, the two commonly used methods currently have certain shortcomings: 1. Hydraulic cylinder plus position displacement sensor proportional propulsion method: This method does not consider how to easily calibrate the contact zero point between the heating head and the roll surface. Therefore, each zero-point calibration requires workers to enter the roll mill and painstakingly measure the gap between the electromagnetic heating head and the roll in an extremely confined space using feeler gauges. This process is quite cumbersome and inaccurate, and sometimes damages the equipment due to improper operation. 2. Cylinder propulsion contact + hydraulic cylinder retraction fixed distance method: This method requires the cylinder to propel the induction heating head to lightly contact the roll each time. Because the cylinder action is not as smooth as hydraulic action, it often jams or sends false signals. Furthermore, since the hydraulic cylinder retracts to a fixed distance of about 3mm, the action signal recognition is inaccurate or sends false signals. Also, the fixed gap between the heating head and the roll is not conducive to flexible adjustment to find the optimal gap, thus presenting shortcomings. Therefore, we propose a hydraulic circuit and its control method for a rolling mill edge heating device. Summary of the Invention
[0005] The technical problem to be solved by this invention is to overcome the existing defects and provide a hydraulic circuit and control method for a roller edge heating device. Compared with the traditional hot oil heating scheme, electromagnetic heating itself has the advantages of fast heating, accurate positioning and low energy consumption. At the same time, the positioning mechanism of the electromagnetic heating head is optimized, which solves the core pain points of the existing electromagnetic heating scheme (difficult calibration, inflexible gap adjustment and poor stability), so that the advantages of electromagnetic heating can be fully utilized and the problems in the background technology can be effectively solved.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic circuit for a roll edge heating device, comprising a cylinder connected to a heating head, wherein an electromagnetic directional valve for controlling the forward and backward movement of the cylinder is provided on the hydraulic circuit of the cylinder, a P-port pressure reducing valve is provided on the P port of the hydraulic circuit of the cylinder, and an A-port pressure reducing valve is provided on the P port of the hydraulic circuit of the cylinder.
[0007] As a preferred embodiment of the present invention, a pressure sensor A is provided on the hydraulic circuit of the oil cylinder near the pressure reducing valve at port A, and a pressure sensor B is provided on the hydraulic circuit of the oil cylinder near the oil cylinder.
[0008] As a preferred embodiment of the present invention, a proportional throttle valve is provided on the hydraulic circuit of the oil cylinder near the pressure sensor A.
[0009] As a preferred embodiment of the present invention, the cylinder is provided with a cylinder displacement sensor.
[0010] As a preferred embodiment of the present invention, the area ratio of the piston cavity to the rod cavity of the hydraulic cylinder is 2:1.
[0011] The present invention also provides a control method for the hydraulic circuit of a roll edge heating device, which uses the aforementioned hydraulic circuit of the roll edge heating device and includes the following steps:
[0012] Differential forward movement: When the heating head needs to move forward, the electromagnet at end b of the solenoid directional valve is energized. At this time, the oil cylinder moves forward differentially. The area ratio of the plug chamber and the rod chamber of the oil cylinder is 2:1, so the actual output force of the oil cylinder is only equivalent to the pressure of 1MPa in the plug chamber.
[0013] Heating head and roller contact: Observe the cylinder displacement sensor. When the reading of the cylinder displacement sensor no longer changes, it means that the heating head has made contact with the roller. At this time, the value of the cylinder displacement sensor indicates that the gap between the heating head and the roller is 0mm. Because there is only 1MPa of cylinder chamber pressure, the heating head will not be damaged. The difference between the two pressure reducing valves can also be set on site according to the actual situation to ensure the safety of the heating head.
[0014] Dynamic gap adjustment: When the electromagnet at end a of the electromagnetic reversing valve is energized, the oil cylinder retracts. Based on the changes in the oil cylinder displacement sensor, the gap between the heating head and the roll is controlled within 3-5mm. At this point, the zeroing and position adjustment work is completed.
[0015] Heating head operation: After the zeroing and position adjustment are completed, the electromagnetic heating head is brought close to the part of the roll that needs to be heated, and it begins to heat it in real time.
[0016] As a preferred technical solution of the present invention, the following steps are also included: pressure monitoring: during the dynamic gap adjustment process, pressure sensor A and pressure sensor B detect the actual pressure of the pressure reducing valve to ensure that the heating head will not be damaged after contacting the roll.
[0017] As a preferred technical solution of the present invention, the following steps are also included: rapid retraction in emergency situations: In order to control the speed of the hydraulic cylinder and make the adjustment more accurate, the opening of the proportional throttle valve is controlled to be very small. When an emergency such as a fire occurs in the rolling mill, the speed of the hydraulic cylinder retraction needs to be very fast. At this time, the opening of the proportional throttle valve is fully opened, so that the heating head can be retracted quickly.
[0018] As a preferred embodiment of the present invention, the pressure of the P-port pressure reducing valve is adjusted to 8 MPa, and the pressure of the A-port pressure reducing valve is adjusted to 5 MPa.
[0019] Compared with the prior art, the beneficial effects of the present invention are:
[0020] 1. By changing the design concept, the function of automatically calibrating the gap between the electromagnetic heating head and the roll is realized through the hydraulic circuit. The operation is more convenient and the positioning is more accurate. After calibration, there is no need to touch the roll every time, and the use process is safe and reliable.
[0021] 2. By using differential forward mode (low pressure of only 1MPa) combined with real-time monitoring by a cylinder displacement sensor, the contact zero position (gap = 0mm) between the heating head and the roll can be automatically and accurately identified. This process eliminates the need for manual intervention in the confined space of the rolling mill for high-risk manual measurements (such as feeler gauge operation), thus eliminating manual calibration errors, operational risks, and potential equipment damage, and significantly improving calibration efficiency and accuracy.
[0022] 3. After accurately obtaining the zero-position reference, the hydraulic system is used to retract stably and based on the feedback from the displacement sensor, the gap between the heating head and the roll can be dynamically and continuously controlled within the optimal range (3-5mm). This overcomes the gap rigidity problem caused by the traditional fixed retraction distance (3mm), significantly improves the debugging flexibility and the controllability of the heating effect, and makes it easier to find and maintain the optimal working gap. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the hydraulic circuit of the heating device of the present invention;
[0024] Figure 2 This is a flowchart illustrating the control method of the present invention.
[0025] In the diagram: 1. P-port pressure reducing valve, 2. Solenoid directional valve, 3. A-port pressure reducing valve, 4. Pressure sensor A, 5. Proportional throttle valve, 6. Pressure sensor B, 7. Hydraulic cylinder, 8. Hydraulic cylinder displacement sensor. Detailed Implementation
[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] Please see Figure 1 This invention provides a technical solution: a hydraulic circuit for a roll edge heating device, including a cylinder 7 connected to a heating head. The hydraulic circuit of the cylinder 7 is equipped with an electromagnetic directional valve 2 for controlling the forward and backward movement of the cylinder 7. The hydraulic control circuit uses an R-type neutral-position electromagnetic directional valve 2 for forward and backward control. A P-port pressure reducing valve 1 is installed at the P port of the hydraulic circuit of the cylinder 7, with the pressure adjusted to 8 MPa; an A-port pressure reducing valve 3 is also installed at the P port of the hydraulic circuit of the cylinder 7, with the pressure adjusted to 5 MPa. The installation of the P-port and A-port pressure reducing valves precisely controls the system pressure, ensuring operational requirements while providing overload protection for key components and the heating head.
[0028] This structure changes the design concept and realizes the function of automatically calibrating the gap between the electromagnetic heating head and the roll to zero position through the hydraulic circuit. It is more convenient to operate and the positioning is more accurate. After calibration, there is no need to touch the roll every time, and the use process is safe and reliable.
[0029] In a preferred embodiment, a pressure sensor A4 is installed on the hydraulic circuit of the cylinder 7 near the pressure reducing valve 3 at port A, and a pressure sensor B6 is installed on the hydraulic circuit of the cylinder 7 near the cylinder 7. Pressure sensor A4 and pressure sensor B6 respectively detect the actual pressure of pressure reducing valve 3 at port A and pressure reducing valve 1 at port P, ensuring that the heating head will not be damaged after contacting the roll.
[0030] In a preferred embodiment, a proportional throttle valve 5 is installed on the hydraulic circuit of the cylinder 7 near the pressure sensor A4. In order to control the action speed of the cylinder 7 and make the adjustment more accurate, the opening of the proportional throttle valve 5 is controlled to be very small. When an emergency such as a fire occurs in the rolling mill, the retraction speed of the cylinder 7 needs to be very fast. At this time, the opening of the proportional throttle valve 5 is fully opened, so that the heating head can be quickly retracted.
[0031] In a preferred embodiment, the cylinder 7 is equipped with a cylinder displacement sensor 8, which is used to detect the gap between the heating head and the roll. The gap can be controlled by observing the value of the cylinder displacement sensor 8 or by automatically controlling the opening and closing of the solenoid directional valve 2 based on the value of the cylinder displacement sensor 8 through an external controller such as a PLC controller.
[0032] The pressure reducing valve, solenoid directional valve, pressure sensor, proportional throttle valve, etc. used in this application are all commonly used electronic components in the prior art. Their specific structure, working principle, control method and circuit connection are all well-known technologies and will not be described in detail here.
[0033] Please see Figure 2 The present invention also provides a control method for the hydraulic circuit of a roll edge heating device, which uses the aforementioned hydraulic circuit of the roll edge heating device and includes the following steps:
[0034] Differential forward movement: When the heating head needs to move forward, the electromagnet at the end of the solenoid reversing valve 2b is energized. At this time, the cylinder 7 moves forward differentially. The area ratio of the plug chamber and the rod chamber of the cylinder 7 is 2:1, so the actual output force of the cylinder 7 is only equivalent to the pressure of 1MPa in the plug chamber.
[0035] Heating head and roller contact: Observe the cylinder displacement sensor 8. When the reading of the cylinder displacement sensor 8 no longer changes, it means that the heating head has made contact with the roller. At this time, the value of the cylinder displacement sensor 8 indicates that the gap between the heating head and the roller is 0mm. Because there is only 1MPa of cylinder chamber pressure, the heating head will not be damaged. The difference between the two pressure reducing valves can also be set on site according to the actual situation to ensure the safety of the heating head.
[0036] Dynamic gap adjustment: When the electromagnet at the end of the electromagnetic reversing valve 2a is energized, the oil cylinder 7 retracts. Based on the change of the oil cylinder displacement sensor 8, the gap between the heating head and the roll is controlled within 3-5mm. At this time, the zeroing and position adjustment work is completed.
[0037] Heating head operation: After the zeroing and position adjustment are completed, the electromagnetic heating head is brought close to the part of the roll that needs to be heated, and it begins to heat it in real time.
[0038] Pressure monitoring: During dynamic gap adjustment, pressure sensors A4 and B6 detect the actual pressure of the pressure reducing valve to ensure that the heating head will not be damaged after contacting the roll.
[0039] Rapid retraction in emergency situations: In order to control the movement speed of the hydraulic cylinder 7 and achieve higher adjustment accuracy, the opening of the proportional throttle valve 5 is controlled to be very small. When an emergency such as a fire occurs in the rolling mill, the retraction speed of the hydraulic cylinder 7 needs to be very fast. At this time, the opening of the proportional throttle valve 5 is fully opened, which can realize the rapid retraction of the heating head.
[0040] This method uses a hydraulic system (cylinder) to drive the entire process, ensuring smooth and reliable operation. It completely solves the problems of motion jamming and false signal alarms that are prone to occur in cylinder solutions, resulting in more stable system operation and a lower failure rate.
[0041] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A control method for the hydraulic circuit of a roll edge heating device, characterized in that, A hydraulic circuit for a roll edge heating device is adopted. The hydraulic circuit for the roll edge heating device includes a cylinder (7) connected to the heating head. The hydraulic circuit of the cylinder (7) is equipped with an electromagnetic reversing valve (2) for controlling the forward and backward movement of the cylinder (7). A P-port pressure reducing valve (1) is installed on the P port of the hydraulic circuit of the cylinder (7), and an A-port pressure reducing valve (3) is installed on the P port of the hydraulic circuit of the cylinder (7). A pressure sensor A (4) is installed on the hydraulic circuit of the cylinder (7) near the A-port pressure reducing valve (3), and a pressure sensor B (6) is installed on the hydraulic circuit of the cylinder (7) near the cylinder (7). A proportional throttle valve (5) is installed on the hydraulic circuit of the cylinder (7) near the pressure sensor A (4). A cylinder displacement sensor (8) is installed on the cylinder (7). The area ratio of the plug cavity and the rod cavity of the cylinder (7) is 2:
1. Includes the following steps: Differential forward movement: When the heating head needs to move forward, the electromagnet at end b of the electromagnetic reversing valve (2) is energized. At this time, the oil cylinder (7) moves forward differentially. The area ratio of the plug chamber and the rod chamber of the oil cylinder (7) is 2:
1. Therefore, the actual output force of the oil cylinder (7) is only equivalent to the pressure of 1MPa in the plug chamber. Heating head contact with the roller: Observe the cylinder displacement sensor (8). When the reading of the cylinder displacement sensor (8) no longer changes, it means that the heating head has contacted the roller. At this time, the value of the cylinder displacement sensor (8) indicates that the gap between the heating head and the roller is 0mm. Because only the cylinder plug chamber pressure of 1MPa is applied, the heating head will not be damaged. The difference between the two pressure reducing valves can also be set on site according to the actual situation to ensure the safety of the heating head. Dynamic gap adjustment: When the solenoid valve (2) a end electromagnet is energized, the oil cylinder (7) retracts. According to the change of the oil cylinder displacement sensor (8), the gap between the heating head and the roll is controlled within 3-5mm. At this time, the zeroing and position adjustment work is completed. Heating head operation: After the zeroing and position adjustment are completed, the electromagnetic heating head is brought close to the part of the roll that needs to be heated, and it begins to heat it in real time.
2. The control method for the hydraulic circuit of the rolling mill edge heating device according to claim 1, characterized in that, It also includes the following steps: Pressure monitoring: During the dynamic gap adjustment process, pressure sensor A (4) and pressure sensor B (6) detect the actual pressure of the pressure reducing valve to ensure that the heating head will not be damaged after contacting the roll.
3. The control method for the hydraulic circuit of the rolling mill edge heating device according to claim 1 or 2, characterized in that, It also includes the following steps: Rapid retraction in emergency situations: In order to control the speed of the cylinder (7) and make the adjustment more accurate, the opening of the proportional throttle valve (5) is controlled very small. When an emergency occurs in the rolling mill, the speed of the cylinder (7) retraction needs to be very fast. At this time, the opening of the proportional throttle valve (5) is fully opened, so that the heating head can be retracted quickly.
4. The control method for the hydraulic circuit of the rolling mill edge heating device according to claim 3, characterized in that: The pressure of the P-port pressure reducing valve (1) is adjusted to 8 MPa, and the pressure of the A-port pressure reducing valve (3) is adjusted to 5 MPa.