Pressure control device for pinch roll under straight-through mode of hot coil box
By integrating a combination of position sensor, pressure sensor and servo valve on the pinch roll, the problem of lack of pressure control of the pinch roll in hot rolling straight-through mode is solved, achieving stable clamping and shearing accuracy, reducing scrap steel and failures, and improving production efficiency.
Patent Information
- Application Number
- CN202422483888.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-10-15
AI Technical Summary
During the hot rolling process, the pinch rolls lack pressure control in the straight-through mode, which often causes the flying shear to stick together and pull up the intermediate billet when cutting the head and tail. In addition, the inertia generated by the material slowing down affects the speed measured by the speed measuring instrument before the flying shear, resulting in shearing errors and the generation of scrap steel.
A combination of position sensors, pressure sensors, solenoid valves, servo valves, and shut-off valves is used to provide pressure control for the pinch rollers. The sensors detect the material position and pressure, and the servo valves control the hydraulic cylinders to apply pressure, ensuring clamping stability and friction, and avoiding the effects of inertia.
Enhance the clamping force of the pinch rollers on the incoming material to prevent adhesion and inertial effects, reduce scrap steel generation, and improve production efficiency and shearing accuracy.
Smart Images
Figure CN223505886U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to metallurgy hot rolling uncoiling technical field, especially relate to a pressure control device of pinch roll under hot coil box straight-through mode. BACKGROUND
[0002] In hot rolling production, the intermediate coil after rough rolling is taken up by the hot coil box, and then is reversed to enter the finishing rolling unit, the hot coil box keeps the temperature distribution almost constant by homogenizing the head and tail temperature of the coil, and ensures the longitudinal performance stability of the incoming material, and the pinch roll is used to clamp the head of the incoming material to the flying shear and the finishing rolling stand when uncoiling.
[0003] The pinch roll unit is composed of three motor-driven rollers, one lower pinch roll and two upper pinch rolls, the rotation points of which are fixed to the outlet side of the hot coil box, the upper pinch roll is driven to press down and lift up by two hydraulic cylinders installed on the transmission side and the operation side, and the pinch roll has no pressure control but only position control in the straight-through mode in the design control, and the position value is 150MM in the waiting position; only in the hot coil box winding mode, the pressure control is put into operation, therefore, in the straight-through mode, the pinch roll is only used as a roller in the normal control, and in the long-term production of hot rolling, the flying shear drum gap is gradually increased due to the influence of shearing force and high temperature, the flying shear often sticks to the head and tail when cutting, and sometimes even sticks to the surface of the intermediate coil and enters the finishing descaling box, and even worse, the scrap steel is brought into the finishing rolling area, and the cutting speed of the flying shear is calculated according to the pre-cutting speed meter to calculate the length of the head and tail, when the rough rolling incoming material is fed to the hot coil box at a high speed of 5m / s, the speed is reduced to 1.3m / s, the pre-cutting speed meter detects the speed, and the flying shear cutting produces errors. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at providing a pressure control device of pinch roll under hot coil box straight-through mode, and solves the problems that the flying shear often sticks to the head and tail when cutting in the hot rolling process and the inertia influences the detection speed when the rough rolling incoming material is reduced in speed.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] A kind of pressure control device of pinch roll under the direct mode of hot coil box, including position sensor, pressure sensor, electromagnetic valve, servo valve and cut-off valve, the electromagnetic valve is connected motor, the servo valve is connected hydraulic cylinder, the position sensor includes transmission side position sensor and operation side position sensor, pressure sensor includes transmission side pressure sensor and operation side pressure sensor, electromagnetic valve includes transmission side electromagnetic valve and operation side electromagnetic valve, servo valve includes transmission side servo valve and operation side servo valve, the transmission side position sensor is connected transmission side pressure sensor, transmission side pressure sensor is connected transmission side electromagnetic valve, transmission side electromagnetic valve is connected transmission side servo valve, the operation side position sensor is connected operation side pressure sensor, operation side pressure sensor is connected operation side electromagnetic valve, operation side electromagnetic valve is connected operation side servo valve, operation side and transmission side are connected in parallel, and are connected cut-off valve, and the transmission side electromagnetic valve is connected operation side servo valve, the operation side electromagnetic valve is connected transmission side servo valve.
[0007] Preferably, the transmission side pressure sensor and the operation side pressure sensor are connected to a controller.
[0008] Working principle: under the direct mode of hot coil box, the transmission side position sensor or the operation side position sensor detects incoming material,
[0009] The transmission side electromagnetic valve and the operation side electromagnetic valve start the motor to drive the pinch roll, the transmission side servo valve and the operation side servo valve start the hydraulic cylinders on both sides to provide pressure for the pinch roll, the transmission side pressure sensor and the operation side pressure sensor detect the size of the applied pressure, and a controller can be added as needed to control the pressure size. When the transmission side position sensor or the operation side position sensor cannot detect the incoming material, the cut-off valve is disconnected, the hydraulic cylinders no longer apply pressure, and the motor stops driving the pinch roll.
[0010] The utility model obtains the beneficial effect:
[0011] (1) The device provides pressure for the pinch roll, enhances the clamping force of the pinch roll on the incoming material, clamps stably, and prevents the intermediate billet surface from entering the precision descaling box or even the finishing area, causing scrap steel to be produced;
[0012] (2) Increasing the pressure on the pinch roll increases the friction between the incoming material and the pinch roll, preventing the inertia from affecting the speed detection of the flying shear speed sensor before cutting, and avoiding errors in flying shear cutting;
[0013] (3) The device reduces scrap steel and reduces faults caused by scrap steel, increases production time, and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The utility model is a structural schematic view.
[0015] Explanation of reference numerals in the attached diagram: 1. Transmission side position sensor; 2. Operating side position sensor; 3. Transmission side pressure sensor; 4. Operating side pressure sensor; 5. Transmission side solenoid valve; 6. Operating side solenoid valve; 7. Transmission side servo valve; 8. Operating side servo valve; 9. Shut-off valve. Detailed Implementation
[0016] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.
[0017] like Figure 1 As shown, a pressure control device for a pinch roll in a hot roll box straight-through mode includes a position sensor, a pressure sensor, a solenoid valve, a servo valve, and a shut-off valve 9. The solenoid valve is connected to a motor, and the servo valve is connected to a hydraulic cylinder. The position sensor includes a drive-side position sensor 1 and an operating-side position sensor 2. The pressure sensor includes a drive-side pressure sensor 3 and an operating-side pressure sensor 4. The solenoid valve includes a drive-side solenoid valve 5 and an operating-side solenoid valve 6. The servo valve includes a drive-side servo valve 7 and an operating-side servo valve 8. The drive-side position sensor 1 is connected to the drive-side pressure sensor 3, the drive-side pressure sensor 3 is connected to the drive-side solenoid valve 5, and the drive-side solenoid valve 5 is connected to the drive-side... Servo valve 7, operating side position sensor 2 connected to operating side pressure sensor 4, operating side pressure sensor 4 connected to operating side solenoid valve 6, operating side solenoid valve 6 connected to operating side servo valve 8, operating side and transmission side are connected in parallel and jointly connected to shut-off valve 9, and transmission side solenoid valve 5 connected to operating side servo valve 8, operating side solenoid valve 6 connected to transmission side servo valve 7; through the combination of position sensor, pressure sensor, solenoid valve and servo valve, the increase of pressure under the straight-through mode of the pinch roller is controlled, the clamping is stable, and the sticking of the flying shear when cutting the head and tail is avoided, the generation of scrap steel is reduced, and the inertia of strip deceleration is reduced, so as to avoid affecting the detection of the flying shear speed measuring instrument before cutting and causing the flying shear to produce errors.
[0018] Before the device was used, taking the six months from January to June 2023 as an example, an average of 5 pieces of scrap steel were scrapped by the flying shear head each month, and the downtime caused by scrap steel was about 20 minutes per piece. Assuming that it takes 3 minutes to roll each piece of steel, the monthly production was reduced by about 7 pieces of steel; the total monthly production was reduced by 12 pieces of steel. The device reduces scrap steel and the downtime caused by scrap steel, thereby improving production efficiency.
Claims
1. A pressure control device for pinch rollers in a hot roll box straight-through mode, characterized in that, The system includes a position sensor, a pressure sensor, a solenoid valve, a servo valve, and a shut-off valve (9). The solenoid valve is connected to a motor, and the servo valve is connected to a hydraulic cylinder. The position sensor includes a drive-side position sensor (1) and an operating-side position sensor (2). The pressure sensor includes a drive-side pressure sensor (3) and an operating-side pressure sensor (4). The solenoid valve includes a drive-side solenoid valve (5) and an operating-side solenoid valve (6). The servo valve includes a drive-side servo valve (7) and an operating-side servo valve (8). The drive-side position sensor (1) is connected to the drive-side... Pressure sensor (3), transmission side pressure sensor (3) is connected to transmission side solenoid valve (5), transmission side solenoid valve (5) is connected to transmission side servo valve (7), operation side position sensor (2) is connected to operation side pressure sensor (4), operation side pressure sensor (4) is connected to operation side solenoid valve (6), operation side solenoid valve (6) is connected to operation side servo valve (8), operation side and transmission side are connected in parallel and are connected to shut-off valve (9), and transmission side solenoid valve (5) is connected to operation side servo valve (8), operation side solenoid valve (6) is connected to transmission side servo valve (7).
2. The pressure control device for the pinch roller in a hot roll box straight-through mode according to claim 1, characterized in that, Both the transmission-side pressure sensor (3) and the operation-side pressure sensor (4) are connected to the controller.