A finishing mill turbid circulating water pressurizing system

Abstract

This utility model relates to a turbid circulating water pressurization system for a finishing mill, belonging to the field of mechanical equipment technology. It includes a main inlet pipe, the outlet of which is connected to the cooling circuit of the finishing mill. A centrifugal pump is installed on the main inlet pipe, driven by a variable frequency motor. The centrifugal pump pressurizes the turbid circulating water and pumps it into the cooling circuit of the finishing mill. An inlet butterfly valve, an inlet pressure gauge, and an inlet pressure sensor are installed on the inlet side of the main inlet pipe, and an outlet butterfly valve, an outlet pressure gauge, and an outlet pressure sensor are installed on the outlet side. The inlet pressure sensor, outlet pressure sensor, and variable frequency motor are connected to a PLC control cabinet. The inlet and outlet pressure sensors detect the water pressure at the inlet and outlet of the main inlet pipe and feed it back to the PLC control cabinet. Upon receiving the signal, the PLC control cabinet adjusts the speed of the variable frequency motor. This application can locally increase the turbid circulating water supply pressure of the finishing mill rolls, improve the cooling effect of the roll rings, and ensure the surface hardness of the roll rings.

Description

Technical Field

[0001] This utility model relates to a turbid circulating water pressurization system for a finishing mill, belonging to the field of mechanical equipment technology. Background Technology

[0002] The addition of a finishing mill at the end of the rolling line has increased the amount of turbid circulating water used on site, resulting in a decrease in the pressure of the turbid circulating water supply system. This has a certain impact on the cooling of the rolls of the finishing mill with a high rolling speed, such as a decrease in the surface hardness of the roll rings, which can cause steel sticking and roll ring cracking during contact with red steel, thus affecting the rolling quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a turbid circulating water pressurization system for finishing mills, which locally increases the turbid circulating water supply pressure of finishing mill rolls, improves the cooling effect of roll rings, ensures the surface hardness of roll rings, prevents iron oxide from adhering to roll rings, and improves rolling quality.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: a turbid circulating water pressurization system for a finishing mill, including a main water inlet pipe, the outlet of which is connected to the cooling circuit of the finishing mill, a centrifugal pump installed on the main water inlet pipe, a variable frequency motor driving the centrifugal pump, the centrifugal pump pressurizing the turbid circulating water and pumping it into the cooling circuit of the finishing mill, an inlet butterfly valve, an inlet pressure gauge and an inlet pressure sensor installed on the inlet side of the main water inlet pipe, and an outlet butterfly valve, an outlet pressure gauge and an outlet pressure sensor installed on the outlet side of the main water inlet pipe; the inlet pressure sensor, the outlet pressure sensor and the variable frequency motor are signal connected to the PLC control cabinet, the inlet pressure sensor and the outlet pressure sensor detect the water pressure at the inlet and outlet of the main water inlet pipe and feed it back to the PLC control cabinet, the PLC control cabinet adjusts the speed of the variable frequency motor after receiving the signal.

[0005] The main inlet pipe is also equipped with a check valve, which is located on the outlet side of the centrifugal pump.

[0006] It is also equipped with a pressure relief pipe, the two ends of which are connected to the inlet side of the inlet butterfly valve and the outlet side of the outlet butterfly valve, respectively, and a pressure-holding and pressure-relief valve is provided on the pressure relief pipe.

[0007] A remote control box is installed next to the finishing mill, and the remote control box is connected to the PLC control cabinet via signal.

[0008] Both the inlet butterfly valve and the outlet butterfly valve are pneumatic butterfly valves.

[0009] Compared with the prior art, the advantages of this utility model are as follows: A turbid circulating water boosting system for a finishing mill controls the speed of a variable frequency motor by detecting pressure signals from an inlet pressure sensor and an outlet pressure sensor. According to the use of the finishing mill equipment, the water supply pressure of the boosting water system is kept constant. When the inlet butterfly valve is open, the variable frequency motor increases the speed and flow rate to maintain a constant water supply pressure; when the inlet butterfly valve is closed, the variable frequency motor decreases the speed and flow rate to maintain a constant water supply pressure, thereby achieving the purpose of energy saving.

[0010] This application has a simple structure and is easy to operate. It can locally increase the water supply pressure of the turbid circulating water in the finishing mill rolls, improve the cooling effect of the roll rings, ensure the surface hardness of the roll rings, prevent iron oxide from adhering to the roll rings, and improve the rolling quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a turbid circulating water booster system for a finishing mill, according to an embodiment of the present invention.

[0012] In the diagram: 1 Main water inlet pipe, 2 Inlet butterfly valve, 3 Inlet pressure gauge, 4 Inlet pressure sensor, 5 Centrifugal pump, 6 Check valve, 7 Outlet butterfly valve, 8 Outlet pressure gauge, 9 Outlet pressure sensor, 10 Pressure relief pipe, 11 Pressure holding and relief valve, 12 PLC control cabinet, 13 Remote operation box, 14 Finishing mill cooling circuit. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1As shown, a turbid circulating water pressurization system for a finishing mill in this embodiment includes a main inlet pipe 1. The outlet of the main inlet pipe 1 is connected to the cooling circuit 14 of the finishing mill. A centrifugal pump 5 is installed on the main inlet pipe 1. The centrifugal pump 5 is driven by a variable frequency motor and pressurizes the turbid circulating water before pumping it into the cooling circuit 14 of the finishing mill. An inlet butterfly valve 2, an inlet pressure gauge 3, and an inlet pressure sensor 4 are installed on the inlet side of the main inlet pipe 1. An outlet butterfly valve 7, an outlet pressure gauge 8, and an outlet pressure sensor 9 are installed on the outlet side of the main inlet pipe 1. The inlet butterfly valve 2 is used to control the opening degree or on / off state of the main inlet pipe inlet, and the outlet butterfly valve 7 is used to control the opening degree or on / off state of the main inlet pipe outlet. The two butterfly valves are used to adjust the turbid circulating water flow rate or to cut off the water flow during maintenance. An inlet pressure gauge displays the inlet pressure of the main inlet pipe, and an outlet pressure gauge displays the outlet pressure of the main inlet pipe. The inlet pressure sensor, outlet pressure sensor, and variable frequency motor are connected to the PLC control cabinet 12. The inlet pressure sensor 4 and outlet pressure sensor 9 detect the water pressure at the inlet and outlet of the main inlet pipe and feed it back to the PLC control cabinet. The PLC control cabinet receives the pressure sensor signals and adjusts the speed of the variable frequency motor, which drives the centrifugal pump 5 to ensure constant pressure. The inlet butterfly valve and outlet butterfly valve are connected to a pressure relief pipe 10. A pressure-holding and pressure-relief valve 11 is installed on the pressure relief pipe 10. When the water pressure in the main inlet pipe exceeds a set value, the pressure-holding and pressure-relief valve is opened to relieve pressure in the main inlet pipe, thereby ensuring constant pressure in the main inlet pipe.

[0015] The main inlet pipe is also equipped with a check valve 6, which is located on the outlet side of the centrifugal pump to prevent water backflow.

[0016] It is also equipped with a remote operation box 13, which is located next to the finishing mill. The remote operation box is connected to the PLC control cabinet and is used to display operating parameters and support remote operation.

[0017] Both the inlet and outlet butterfly valves are pneumatic butterfly valves.

[0018] Before starting the finishing mill, the pressure sensor checks whether the pressure of the circulating water reaches the minimum requirement. If the pressure is insufficient, the pressurization system starts automatically; if the pressure is normal, the finishing mill can be put into operation.

[0019] Before starting the centrifugal pump, it is necessary to confirm that the water supply pressure of the main inlet pipe is normal and that the inlet and outlet butterfly valves are open; if the inlet and outlet butterfly valves are not open or the pressure of the main inlet pipe is abnormal, the centrifugal pump must not be started to avoid dry running or pipe bursting.

[0020] During system operation, the PLC control cabinet receives pressure sensor signals and adjusts the variable frequency motor speed to maintain constant pressure. When the finishing mill starts, the system automatically detects the pressure and starts the centrifugal pump; when the pressure is too high, the pressure relief valve activates to release pressure. The remote control box displays the operating status in real time, facilitating monitoring by operators.

[0021] The variable frequency motor speed is controlled by pressure signals detected by the inlet and outlet pressure sensors. Based on the use of the finishing mill equipment, the water supply pressure of the booster water system is kept constant. When the inlet butterfly valve is open, the variable frequency motor increases the speed and flow rate to maintain a constant water supply pressure; when the inlet butterfly valve is closed, the variable frequency motor decreases the speed and flow rate to maintain a constant water supply pressure, thereby achieving the purpose of energy saving.

[0022] This application has a simple structure and is easy to operate. It can locally increase the water supply pressure of the turbid circulating water in the finishing mill rolls, improve the cooling effect of the roll rings, ensure the surface hardness of the roll rings, prevent iron oxide from adhering to the roll rings, and improve the rolling quality.

[0023] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A turbid circulating water booster system for a finishing mill, characterized in that: The system includes a main water inlet pipe, the outlet of which is connected to the cooling circuit of the finishing mill. The main water inlet pipe is equipped with a centrifugal pump, driven by a variable frequency motor. The centrifugal pump pressurizes the circulating water and pumps it into the cooling circuit of the finishing mill. The main water inlet pipe has an inlet butterfly valve, an inlet pressure gauge, and an inlet pressure sensor on its inlet side, and an outlet butterfly valve, an outlet pressure gauge, and an outlet pressure sensor on its outlet side. The inlet pressure sensor, outlet pressure sensor, and variable frequency motor are connected to a PLC control cabinet. The inlet pressure sensor and outlet pressure sensor detect the water pressure at the inlet and outlet of the main water inlet pipe and feed it back to the PLC control cabinet. Upon receiving the signal, the PLC control cabinet adjusts the speed of the variable frequency motor.

2. The turbid circulating water booster system for a finishing mill according to claim 1, characterized in that: The main inlet pipe is also equipped with a check valve, which is located on the outlet side of the centrifugal pump.

3. The turbid circulating water booster system for a finishing mill according to claim 1, characterized in that: It is also equipped with a pressure relief pipe, the two ends of which are connected to the inlet side of the inlet butterfly valve and the outlet side of the outlet butterfly valve, respectively, and a pressure-holding and pressure-relief valve is provided on the pressure relief pipe.

4. The turbid circulating water booster system for a finishing mill according to claim 1, characterized in that: A remote control box is installed next to the finishing mill, and the remote control box is connected to the PLC control cabinet via signal.

5. The turbid circulating water booster system for a finishing mill according to claim 1, characterized in that: Both the inlet butterfly valve and the outlet butterfly valve are pneumatic butterfly valves.

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