An energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill

Abstract

This utility model discloses an energy-saving control system for a CPC hydraulic station in a cold-rolling six-roll reversible mill. The system includes a hydraulic station motor, a soft starter, a power supply circuit, and a control circuit. The power supply circuit is connected to the hydraulic station motor via the soft starter. The control circuit controls the soft starter's start and stop via a signal output from the mill's main control PLC. This utility model achieves automatic startup of the CPC hydraulic station motor during material feeding at the mill uncoiler and during the first rolling pass, and automatic shutdown at other times, thus achieving energy saving and consumption reduction.

Description

Technical Field

[0001] This utility model relates to the technical field of cold rolling line equipment, and in particular to an energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill. Background Technology

[0002] The lateral displacement cylinders for uncoiling in a six-roll reversible cold rolling mill are driven by a continuous pressure control (CPC) centering device for strip centering during uncoiling and are equipped with a separate hydraulic station. The motor of this hydraulic station operates in a normally open mode. However, the CPC hydraulic station is only used during uncoiler feeding and the first uncoiling stage. Under traditional operating conditions, this hydraulic station suffers from high energy consumption and low efficiency. Therefore, finding a suitable control method to reduce energy consumption has become an urgent problem to be solved.

[0003] Therefore, those skilled in the art are dedicated to developing an energy-saving control system for the CPC hydraulic station of a cold rolling six-roll reversible mill, in order to overcome the aforementioned problems existing in the prior art. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this utility model is how to provide an energy-saving control system for the CPC hydraulic station of a cold rolling six-roll reversible mill, so as to achieve the purpose of energy saving and consumption reduction.

[0005] To achieve the above objectives, this utility model provides an energy-saving control system for a CPC hydraulic station of a six-roll reversible cold rolling mill, including a hydraulic station motor, a soft starter, a power supply circuit, and a control circuit. The power supply circuit is connected to the hydraulic station motor through the soft starter, and the control circuit controls the start and stop of the soft starter by outputting a signal from the mill's main control PLC.

[0006] Furthermore, the power circuit input terminal is connected to a three-phase AC power supply, the power circuit output terminal is connected to the soft starter input terminal, and the soft starter output terminal is connected to the hydraulic station motor.

[0007] Furthermore, the power circuit includes a switching device and a contactor. The input terminal of the switching device is externally connected to the three-phase AC power supply, the output terminal of the switching device is connected to the input terminal of the contactor, and the output terminal of the contactor is connected to the input terminal of the soft starter.

[0008] Furthermore, the contactor is controlled by a start / stop button.

[0009] Furthermore, the control circuit includes a control power supply, a motor start button, and a motor stop button. One end of the contactor coil is connected to one end of the control power supply, and the other end of the contactor coil is connected to the control power supply through the normally open contact of the motor start button and the normally closed contact of the motor stop button. The normally open contact of the contactor is connected in parallel with the normally open contact of the motor start button.

[0010] Furthermore, the control circuit also includes an intermediate relay, the coil of which is connected to the output signal of the mill main control PLC, the normally open contact of which is connected to the external control terminal of the soft starter, and the control power supply terminal of the soft starter is connected to the control power supply of the soft starter.

[0011] Furthermore, the three-phase AC power supply is a three-phase AC 380V power supply.

[0012] Furthermore, the control power supply is a single-phase AC 220V power supply.

[0013] Furthermore, the soft starter control power supply is a single-phase AC 220V power supply.

[0014] Furthermore, the rated power of the soft starter is matched with the rated power of the hydraulic station motor.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention demonstrates excellent control during overall use. It can automatically start and stop the CPC hydraulic station motor of the cold rolling six-roll reversible mill based on the judgment of the mill's operation process, thereby achieving the goal of energy saving and consumption reduction.

[0017] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main circuit of the CPC hydraulic station for a cold rolling six-roll reversible mill, based on existing technology.

[0019] Figure 2 This is a schematic diagram of the control circuit of the CPC hydraulic station for a cold rolling six-roll reversible mill;

[0020] Figure 3 This is a schematic diagram of the main circuit of the energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill, which is a preferred embodiment of this utility model.

[0021] Figure 4This is a schematic diagram of the control circuit of an energy-saving control system for a CPC hydraulic station of a six-roll reversible cold rolling mill, which is a preferred embodiment of the present invention. Detailed Implementation

[0022] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0023] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and this invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0024] To address the high energy consumption and low efficiency of the CPC hydraulic station in a cold-rolling six-roll reversible mill under traditional operating modes, this invention provides a comprehensive energy-saving control system. By dynamically adjusting the hydraulic pump motor speed using variable frequency speed control technology to match the actual rolling load requirements, it reduces energy loss during no-load and low-pressure maintenance phases. Combined with a pressure-flow composite closed-loop control algorithm, it optimizes system output in real time, reducing overflow losses. An energy recovery device is introduced to convert hydraulic energy during braking and unloading processes into electrical energy fed back to the grid, further improving energy efficiency. Simultaneously, an integrated intelligent monitoring module adaptively adjusts the control strategy based on rolling process parameters, ensuring rolling accuracy and equipment stability while achieving a 10%–20% reduction in overall hydraulic station energy consumption. Practical applications show that this system can significantly reduce operating costs, extend the lifespan of key components, and provide an effective solution for the green upgrading of high-energy-consuming metallurgical equipment.

[0025] The technical solution adopted in this utility model is as follows:

[0026] An energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill is proposed. The original hydraulic station control cabinet is modified by adding a soft starter. The starter is controlled by the output signal of the rolling mill main control PLC, so that the CPC hydraulic station motor can be automatically started during the feeding of the rolling mill uncoiler and the first rolling pass, and automatically shut down at other times, thereby achieving the purpose of energy saving and consumption reduction.

[0027] Figure 1 and Figure 2This is a circuit diagram of an existing CPC hydraulic station for a six-roll reversible cold rolling mill. Its main circuit power supply is AC380V, and the main circuit is equipped with contactor KM1 and thermal relay FR for controlling the motor M (rated power 15kW, delta connection) of the CPC hydraulic station. Its control circuit power supply is AC220V, and is connected in sequence with the normally closed contact of thermal relay FR, motor stop button SB1, motor start button SB2 and the coil of main contactor KM1. The normally open contact of main contactor KM1 is self-locked with motor start button SB2.

[0028] The existing circuitry used in the CPC hydraulic station of a six-roll reversible cold rolling mill is a common motor start-stop circuit, which has the following disadvantages:

[0029] 1. The hydraulic station needs to be started and stopped manually;

[0030] 2. When a motor is connected in a delta configuration, the starting current is 3-7 times the rated current. Frequent starts and stops will shorten the motor's lifespan and may even burn it out.

[0031] For the reasons mentioned above, the existing CPC hydraulic station motor operates in a normally open mode.

[0032] like Figure 3 and Figure 4 As shown in the circuit diagram of this embodiment, the design has been improved based on the existing design by adding a soft starter RQ (model RMZX-360-15-Z, Shanghai People's Electric). Its advantages are as follows:

[0033] 1. It can enable reduced voltage or current limiting starting of the motor, reducing the starting current and extending the motor's lifespan;

[0034] 2. Remote control is possible;

[0035] 3. Equipped with a display screen and operation buttons, it can show the operating status and alarm information, and also allows for parameter adjustment at any time;

[0036] 4. It has a built-in thermal relay function, so the original thermal relay components are no longer needed.

[0037] In this embodiment, Figure 1 and Figure 2 Based on the existing design, the thermal relay FR in the main circuit is replaced with a soft starter RQ, and the normally closed contact 1 of the thermal relay FR1 in the control circuit is changed. Figure 2 (As shown) After removal, it is directly connected; In this embodiment, the thermal relay FR in the existing design is removed and directly replaced by the added soft starter RQ, which simplifies the circuit design.

[0038] In this embodiment, the soft starter RQ is model RMZX-360-15-Z. A new intermediate relay KA1 is added. The normally open contact 2 of the intermediate relay KA1 is the external control signal, provided by the rolling mill main control PLC (not shown in the figure). Energization of the coil of the intermediate relay KA1 closes the normally open contact 2, controlling the operation of the soft starter RQ. This design realizes external control of the soft starter RQ, achieving remote automatic control of the CPC hydraulic station.

[0039] In this embodiment, a PLC program is written according to the rolling mill's operating status to control the soft starter RQ to start and stop, so that the CPC hydraulic station is turned on when the rolling mill uncoiler is feeding and during the first uncoiling, and automatically turned off at other times, thereby realizing the automatic start and stop control of the CPC hydraulic station and achieving the purpose of energy saving and consumption reduction.

[0040] In this embodiment, the soft starter RQ has simple wiring, and the operating parameters can be adjusted at any time, which can better protect the motor M.

[0041] This embodiment uses a soft starter RQ as the main control unit. During use, the output is controlled by the rolling mill main control PLC, so that the CPC hydraulic station motor M automatically stops running. Moreover, this embodiment is safe, efficient, low-risk and low-investment in the overall use process, and can better meet the energy-saving and consumption-reducing needs of the rolling mill CPC hydraulic station.

[0042] like Figure 3 and Figure 4 As shown, this embodiment provides an energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill, including a hydraulic station motor M, a soft starter RQ, a power supply circuit, and a control circuit. The power supply circuit is connected to the hydraulic station motor M through the soft starter, and the control circuit controls the start and stop of the soft starter RQ by outputting signal 3 from the mill's main control PLC.

[0043] like Figure 3 As shown, the power circuit input terminal is connected to a three-phase AC power supply, the power circuit output terminal is connected to the soft starter RQ input terminal, and the soft starter RQ output terminal is connected to the hydraulic station motor M.

[0044] In this embodiment, the three-phase AC power supply is a three-phase AC 380V power supply (AC380V).

[0045] The power supply circuit includes a switch QS1 and a contactor KM1. The input terminal of the switch QS1 is connected to a three-phase AC power supply, the output terminal of the switch QS1 is connected to the input terminal of the contactor KM1, and the output terminal of the contactor KM1 is connected to the input terminal of the soft starter RQ.

[0046] Contactor KM1 is controlled by start / stop buttons.

[0047] like Figure 4As shown, the control circuit includes a control power supply, a motor start button SB2, and a motor stop button SB1. One end of the contactor KM1 coil is connected to one end of the control power supply, and the other end of the contactor KM1 coil is connected to the control power supply through the normally open contact of the motor start button SB2 and the normally closed contact of the motor stop button SB1. The normally open contact of the contactor KM1 is connected in parallel with the normally open contact of the motor start button SB2.

[0048] In this embodiment, the control power supply is a single-phase AC 220V power supply.

[0049] The control circuit also includes an intermediate relay KA1. The coil of the intermediate relay KA1 is connected to the output signal 3 of the main control PLC of the rolling mill. The normally open contact 2 of the intermediate relay KA1 is connected to the external control terminal of the soft starter RQ. The control power terminal of the soft starter RQ is connected to the control power supply of the soft starter.

[0050] In this embodiment, the soft starter control power supply is a single-phase AC 220V power supply.

[0051] Preferably, the rated power of the soft starter RQ is matched with the rated power of the hydraulic station motor M.

[0052] This embodiment presents an energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill, used to control the automatic start and stop of the CPC hydraulic station motor. This invention offers excellent control performance, low investment, and, in practice, achieves energy conservation and consumption reduction.

[0053] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An energy-saving control system for a CPC hydraulic station of a cold rolling six-roll reversible mill, characterized in that, It includes a hydraulic station motor, a soft starter, a power supply circuit, and a control circuit. The power supply circuit is connected to the hydraulic station motor through the soft starter, and the control circuit controls the start and stop of the soft starter by outputting signals from the rolling mill main control PLC.

2. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 1, characterized in that, The power circuit input terminal is connected to a three-phase AC power supply, the power circuit output terminal is connected to the soft starter input terminal, and the soft starter output terminal is connected to the hydraulic station motor.

3. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 2, characterized in that, The power circuit includes a switching device and a contactor. The input terminal of the switching device is connected to the three-phase AC power supply, the output terminal of the switching device is connected to the input terminal of the contactor, and the output terminal of the contactor is connected to the input terminal of the soft starter.

4. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 3, characterized in that, The contactor is controlled by a start / stop button.

5. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 4, characterized in that, The control circuit includes a control power supply, a motor start button, and a motor stop button. One end of the contactor coil is connected to one end of the control power supply, and the other end of the contactor coil is connected to the control power supply through the normally open contact of the motor start button and the normally closed contact of the motor stop button. The normally open contact of the contactor is connected in parallel with the normally open contact of the motor start button.

6. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 5, characterized in that, The control circuit also includes an intermediate relay, the coil of which is connected to the output signal of the mill main control PLC, the normally open contact of which is connected to the external control terminal of the soft starter, and the control power supply terminal of the soft starter is connected to the control power supply of the soft starter.

7. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 2, characterized in that, The three-phase AC power supply is a three-phase 380V AC power supply.

8. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 5, characterized in that, The control power supply is a single-phase AC 220V power supply.

9. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 6, characterized in that, The soft starter is powered by a single-phase AC 220V power supply.

10. The energy-saving control system for the CPC hydraulic station of a six-roll reversible cold rolling mill as described in claim 1, characterized in that, The rated power of the soft starter is matched with the rated power of the hydraulic station motor.

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