Hydraulic control system and control method for uncoiling line

Abstract

The invention discloses an uncoiling line hydraulic control system and a control method in the technical field of uncoiling lines, the uncoiling line hydraulic control system comprises a hydraulic pump station, the hydraulic pump station is matched with an uncoiling line hydraulic mechanism, and the hydraulic pump station and the coiling hydraulic mechanism are controlled by a PLC (Programmable Logic Controller). The uncoiling line hydraulic mechanism comprises a feeding trolley valve group, an uncoiling machine valve group, a coiling block supporting valve group, a pinch valve group, an inlet loop valve group and an outlet loop valve group, and the feeding trolley valve group controls a feeding trolley lifting piston cylinder; the uncoiling machine valve group respectively controls an uncoiling expansion piston cylinder, an uncoiling seat movable moving piston cylinder, a material pressing roller lifting piston cylinder and a material pressing roller hydraulic motor to be connected; the PLC controls the pressure pump station and the uncoiling line hydraulic mechanism according to the requirements of different parts for flow and pressure, so that the whole set of hydraulic servo control system is quick in response, low in noise and low in energy consumption.

Description

Technical Field

[0001] The present invention relates to an uncoiler hydraulic control system and a control method in the technical field of uncoiler lines. Background Art

[0002] In recent years, in the metal sheet processing industry, due to the multi-function, high efficiency, and high material utilization rate of the uncoiler line, it has become more and more popular among customers in the sheet metal processing industry, especially the automotive industry. A large amount of hydraulic control is used in the operation of equipment in the uncoiler line. Usually, the hydraulic control oil circuit of the uncoiler line reaches about 30 groups. Optimizing the design of the uncoiler hydraulic control system is of great significance for improving the production efficiency of the whole line, improving the operation stability of the equipment, extending the service life of the hydraulic system and components, reducing energy consumption, and reducing the user's usage cost. At present, most of the uncoiler hydraulic systems adopt medium pressure (the maximum is 14 Mpa, the working pressure is 10 Mpa). The hydraulic material head shear and the loading trolley have the largest oil supply. Generally, the flow rate of the hydraulic pump is determined according to the oil supply required by the rising speed of the loading trolley. Traditional uncoiler lines usually use ordinary three-phase motors to drive plunger pumps, which not only have high noise but also have a large amount of overflow loss, large reactive power loss, and cause the oil temperature to rise. Summary of the Invention

[0003] The purpose of the present invention is to provide an uncoiler hydraulic control system and a control method, which have fast response, low noise, and low energy consumption.

[0004] To achieve the above purpose, the present invention provides an uncoiler hydraulic control system, which includes a hydraulic pump station. The hydraulic pump station cooperates with the uncoiler hydraulic mechanism, and the hydraulic pump station and the coiler hydraulic mechanism are controlled by a PLC controller.

[0005] Compared with the prior art, the beneficial effect of the present invention lies in that the PLC controller controls the pressure pump station and the uncoiler hydraulic mechanism according to the requirements of different components for the flow rate and pressure, so that the whole hydraulic servo control system has fast response, low noise, and low energy consumption.

[0006] As a further improvement of the present invention, the uncoiler hydraulic mechanism includes a loading trolley valve group, an uncoiler valve group, a reel support valve group, a pinch roll valve group, an inlet loop valve group, and an outlet loop valve group. The loading trolley valve group controls the lifting piston cylinder of the loading trolley. The uncoiler valve group controls the expansion and contraction piston cylinder of the uncoiler, the moving piston cylinder of the uncoiler seat, the lifting piston cylinder of the pressure roller, and is connected to the pressure roller hydraulic motor. The reel support valve group controls the lifting piston cylinder of the reel support. The pinch roll valve group controls the moving piston cylinder of the feeding table, the lifting piston cylinder of the feeding table, the lifting piston cylinder of the pinch roll, the lifting piston cylinder of the bending roll, and the lifting piston cylinder of the material head shear. The inlet loop valve group controls the lifting piston cylinder of the inlet loop. The outlet loop valve group controls the lifting piston cylinder of the outlet loop.

[0007] In this way, through the cooperation of each piston cylinder, the coil loading on the uncoiler line is realized.

[0008] As a further improvement of the present invention, a servo motor of the hydraulic pump station drives a gear pump. The oil suction port of the gear pump is connected to the fuel tank. The oil outlet P1 of the gear pump is respectively connected in parallel with the valve block oil inlet P2 of the lifting piston cylinder of the loading trolley, the valve block oil inlet P3 of the expanding and contracting piston cylinder of the uncoiling reel, the valve block oil inlet P4 of the lifting piston cylinder of the reel support, the valve block oil inlet P5 of the moving piston cylinder of the guiding table, the valve block oil inlet P7 of the lifting piston cylinder of the inlet loop, and the valve block oil inlet P8 of the lifting piston cylinder of the outlet loop. The oil return port T1 of the fuel tank is respectively connected in parallel with the valve block oil inlet T2 of the lifting piston cylinder of the loading trolley, the valve block oil inlet T3 of the expanding and contracting piston cylinder of the uncoiling reel, the valve block oil inlet T4 of the lifting piston cylinder of the reel support, the valve block oil inlet T5 of the moving piston cylinder of the guiding table, the valve block oil inlet T7 of the lifting piston cylinder of the inlet loop, and the valve block oil inlet T8 of the lifting piston cylinder of the outlet loop. The oil circuits of the moving piston cylinder of the uncoiling seat, the moving piston cylinder of the uncoiling seat, the hydraulic motor of the pressure roller and the lifting piston cylinder of the pressure roller are connected. The oil circuits of the moving piston cylinder of the guiding table, the lifting piston cylinder of the guiding table, the lifting piston cylinder of the pinch roll, the lifting piston cylinder of the bending roll and the oil circuit of the lifting piston cylinder of the head shear are connected.

[0009] In this way, the oil inlet ports and oil return ports of each upgrading piston cylinder are correspondingly connected in parallel, so as to realize unified control and adjustment.

[0010] As a further improvement of the present invention, the encoder PG of the rotational speed of the servo motor M1 of the hydraulic pump station is connected to the X3 port of the servo controller SDR; the voltage signal output end of the pump port pressure sensor BP1 of the hydraulic pump station is connected to the pump port pressure input end AI1 of the servo controller SDR; the flow control analog signal output ends V0 and M0 of the PLC controller are respectively connected to the flow control analog signal input ends AI3 and FAC3 of the servo controller SDR; the pressure control analog signal output ends V1 and M1 of the PLC controller are connected to the pressure control analog signal input ends AI2 and FAC2 of the servo controller SDR; a servo enable button SB1 is connected between the start signal input end DI3 of the servo controller SDR and the common terminal COM.

[0011] In this way, according to the requirements of different components for the flow rate and pressure magnitude, the flow rate output of the pump port of the hydraulic pump station can be driven by the servo motor, and the torque of the servo motor can be controlled to control the output pressure magnitude of the pump port, so as to realize the fast response of the system control, with overall low noise and low energy consumption.

[0012] In order to achieve the above object, the present invention also provides a hydraulic control method for an uncoiling line, including the following steps, S1, driving the rotational speed of the gear pump by the servo motor to control the flow rate output; S2, controlling the torque of the servo motor to control the output pressure magnitude of the pump port.

[0013] As a further improvement of the present invention, the specific content of S1 is as follows: During the process of the servo controller SDR executing the control instructions of the PLC controller, it receives the pump port pressure feedback by the pump port pressure sensor BP1 and the motor speed information feedback by the encoder PG, and adjusts the servo motor speed in real time, thereby controlling the output flow rate of the servo pump in real time.

[0014] As a further improvement of the present invention, the specific content of S2 is as follows: The pressure control analog signal output terminals V1 and M1 of the PLC controller send the magnitude of the pressure signal to the pressure control analog signal input terminals AI2 and FAC2 of the servo controller SDR, and then the servo controller SDR controls the torque of the servo motor to control the pressure at the servo pump port.

[0015] As a further improvement of the present invention, S1 further includes the following content: The flow control analog signal output terminals V0 and M0 of the PLC controller send the magnitude of the flow signal to the flow control analog signal input terminals AI3 and FAC3 of the servo controller SDR, and then the servo controller SDR controls the speed of the servo motor to control the flow rate of the servo pump.

[0016] As a further improvement of the present invention, S2 further includes the following content: When the pump port pressure sensor BP1 detects that the pump port pressure of the servo pump exceeds the set pressure, the torque output of the servo motor is reduced to maintain the set pressure.

[0017] Compared with the prior art, the beneficial effect of the present invention is that according to the requirements of different components for the flow rate and pressure magnitude, the speed of the gear pump is driven by the servo motor to control the flow rate output, and the torque of the servo motor is controlled to control the magnitude of the pump port output pressure. In this way, the comprehensive energy consumption of the hydraulic pump station is reduced by more than 80% compared with the traditional hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a table of the working pressure and motor speed of each component of the present invention.

[0019] Figure 2 It is the connection of the hydraulic control system of the present invention Figure 1 .

[0020] Figure 3 It is the connection of the hydraulic control system of the present invention Figure 2 .

[0021] Figure 4 It is the connection of the hydraulic control system of the present invention Figure 3 .

[0022] Figure 5 It is the electrical control diagram of the hydraulic control system of the present invention. Detailed implementation mode

[0023] The present invention will be further described below with reference to the accompanying drawings: As Figures 1 - 5 shown, an uncoiler hydraulic control system, characterized in that it includes a hydraulic pump station, the hydraulic pump station is matched with the uncoiler hydraulic mechanism, and the hydraulic pump station and the coiler hydraulic mechanism are controlled by a PLC controller.

[0024] The uncoiler hydraulic mechanism includes a loading trolley valve group, an uncoiler valve group, a reel support valve group, a pinch roll valve group, an inlet loop valve group and an outlet loop valve group. The loading trolley valve group controls the lifting piston cylinder of the loading trolley. The uncoiler valve group controls the expansion and contraction piston cylinder of the uncoiler, the moving piston cylinder of the uncoiler seat, the lifting piston cylinder of the pressure roller and the hydraulic motor of the pressure roller respectively. The reel support valve group controls the lifting piston cylinder of the reel support. The pinch roll valve group controls the moving piston cylinder of the feeding table, the lifting piston cylinder of the feeding table, the lifting piston cylinder of the pinch roll, the lifting piston cylinder of the bending roll and the lifting piston cylinder of the head shear. The inlet loop valve group controls the lifting piston cylinder of the inlet loop. The outlet loop valve group controls the lifting piston cylinder of the outlet loop.

[0025] The servo motor of the hydraulic pump station drives a gear pump. The suction port of the gear pump is connected to the oil tank. The oil outlet P1 of the gear pump is respectively connected in parallel with the oil inlet P2 of the valve block of the lifting piston cylinder of the loading trolley, the oil inlet P3 of the valve block of the expansion and contraction piston cylinder of the uncoiler, the oil inlet P4 of the valve block of the lifting piston cylinder of the reel support, the oil inlet P5 of the valve block of the moving piston cylinder of the feeding table, the oil inlet P7 of the valve block of the lifting piston cylinder of the inlet loop, and the oil inlet P8 of the valve block of the lifting piston cylinder of the outlet loop. The oil return port T1 of the oil tank is respectively connected in parallel with the oil inlet T2 of the valve block of the lifting piston cylinder of the loading trolley, the oil inlet T3 of the valve block of the expansion and contraction piston cylinder of the uncoiler, the oil inlet T4 of the valve block of the lifting piston cylinder of the reel support, the oil inlet T5 of the valve block of the moving piston cylinder of the feeding table, the oil inlet T7 of the valve block of the lifting piston cylinder of the inlet loop, and the oil inlet T8 of the valve block of the lifting piston cylinder of the outlet loop. The oil circuits of the moving piston cylinder of the uncoiler seat, the moving piston cylinder of the uncoiler seat, the hydraulic motor of the pressure roller and the lifting piston cylinder of the pressure roller are connected. The moving piston cylinder of the feeding table, the lifting piston cylinder of the feeding table, the lifting piston cylinder of the pinch roll are connected, the lifting piston cylinder of the bending roll is connected and the oil circuit of the lifting piston cylinder of the head shear is connected.

[0026] The encoder PG of the servo motor M1 of the hydraulic pump station is connected to the X3 port of the servo controller SDR; the voltage signal output end of the pump port pressure sensor BP1 of the hydraulic pump station is connected to the pump port pressure input end AI1 of the servo controller SDR; the flow control analog signal output ends V0 and M0 of the PLC controller are respectively connected to the flow control analog signal input ends AI3 and FAC3 of the servo controller SDR; the pressure control analog signal output ends V1 and M1 of the PLC controller are connected to the pressure control analog signal input ends AI2 and FAC2 of the servo controller SDR; a servo enable button SB1 is connected between the start signal input end DI3 of the servo controller SDR and the common terminal COM.

[0027] As Figures 1 - 5 shown, a hydraulic control method for an uncoiler line includes the following contents. S1, the servo motor drives the speed of the gear pump to control the flow output. During the process of the servo controller SDR executing the control instructions of the PLC controller, it receives the pump port pressure feedback by the pump port pressure sensor BP1 and the motor speed information feedback by the encoder PG, and adjusts the servo motor speed in real time, thereby controlling the output flow of the servo pump in real time.

[0028] The flow control analog signal output ends V0 and M0 of the PLC controller send the magnitude of the flow signal to the flow control analog signal input ends AI3 and FAC3 of the servo controller SDR, and then the servo controller SDR controls the servo motor speed to control the servo pump flow.

[0029] S2, control the servo motor torque to control the magnitude of the pump port output pressure.

[0030] The pressure control analog signal output ends V1 and M1 of the PLC controller send the magnitude of the pressure signal to the pressure control analog signal input ends AI2 and FAC2 of the servo controller SDR, and then the servo controller SDR controls the servo motor torque to control the servo pump port pressure.

[0031] When the pump port pressure sensor BP1 detects that the pump port pressure of the servo pump exceeds the set pressure, the servo motor torque output is reduced to maintain the set pressure.

[0032] In the present invention, the servo hydraulic pump station is connected to a number of hydraulic cylinders and hydraulic motors through a manifold block. The following hydraulic components are arranged from front to back along the uncoiler line: the loading trolley lifting piston cylinder, the uncoiler expanding and contracting piston cylinder, the uncoiler seat moving piston cylinder, the pressure roller lifting piston cylinder, the pressure roller hydraulic motor, the reel support lifting piston cylinder, the feeding table moving piston cylinder, the feeding table lifting piston cylinder, the pinch roll lifting piston cylinder, the bending roll lifting piston cylinder, the head shear lifting piston cylinder, the inlet loop lifting piston cylinder, and the outlet loop lifting piston cylinder.

[0033] On the hydraulic pump station, a servo motor drives a gear pump. The suction port of the gear pump is connected to the fuel tank. The oil outlet P1 of the gear pump is respectively connected in parallel to the oil inlet P2 of the feeding trolley valve block, the oil inlet P3 of the uncoiler valve block, the oil inlet P4 of the reel support valve block, the oil inlet P6 of the leading pinch roll valve block, the oil inlet P7 of the inlet loop valve block, and the oil inlet P8 of the outlet loop valve block. The oil return port T1 of the fuel tank is respectively connected in parallel to the oil inlet T2 of the feeding trolley valve block, the oil inlet T3 of the uncoiler valve block, the oil inlet T4 of the reel support valve block, the oil inlet T6 of the leading pinch roll valve block, the oil inlet T7 of the inlet loop valve block, and the oil inlet T8 of the outlet loop valve block.

[0034] Each electromagnetic directional valve is controlled by a PLC controller. The encoder PG for detecting the rotational speed of the servo motor M1 is connected to the X3 port of the servo controller SDR. The voltage signal output terminal of the pump port pressure sensor BP1 is connected to the pump port pressure input terminal AI1 of the servo controller SDR. The flow control analog signal output terminals V0 and M0 of the PLC controller are respectively connected to the flow control analog signal input terminals AI3 and FAC3 of the servo controller SDR. The pressure control analog signal output terminals V1 and M1 of the PLC controller are connected to the pressure control analog signal input terminals AI2 and FAC2 of the servo controller SDR. The servo enable button SB1 is connected between the start signal input terminal DI3 and the common terminal COM of the servo controller SDR. During the process of the servo controller SDR executing the control instructions of the PLC controller, it receives the pump port pressure feedback by the pump port pressure sensor BP1 and the motor speed information feedback by the encoder PG, and adjusts the rotational speed of the servo motor in real time, thereby controlling the output flow of the servo pump in real time. The pressure control analog signal output terminals V1 and M1 of the PLC controller send the magnitude of the pressure signal to the pressure control analog signal input terminals AI2 and FAC2 of the servo controller SDR, and then the servo controller SDR controls the torque of the servo motor to control the servo pump port pressure. The flow control analog signal output terminals V0 and M0 of the PLC controller send the magnitude of the flow signal to the flow control analog signal input terminals AI3 and FAC3 of the servo controller SDR, and then the servo controller SDR controls the rotational speed of the servo motor to control the servo pump flow. When the pump port pressure sensor BP1 detects that the pump port pressure of the servo pump exceeds the set pressure, it reduces the torque output of the servo motor to maintain the set pressure.

[0035] The actual coil loading process on the uncoiler line is as follows: The trolley moves to the stock rack, rises to lift the coil, the trolley moves to the center position of the uncoiler, the reel support rises, the trolley drops, the uncoiler reel expands, the pressure roller drops to press the coil head, the uncoiler rotates forward and the pressure roller hydraulic motor rotates forward to cooperate with unwinding the coil, the uncoiler rises and moves out to a suitable position, the pinch roll drops, the bending roll drops, the coil head shear descends to cut off the coil head and then rises, and the inlet and outlet loops drop after the coil head passes through.

[0036] According to the requirements of different components for the flow rate and pressure, the present invention can drive the rotational speed of the gear pump through a servo motor to control the flow rate output, and control the torque of the servo motor to control the output pressure at the pump port. The whole set of hydraulic servo control system has a fast response, low noise, and low energy consumption, and the comprehensive energy consumption is reduced by more than 80% compared with the traditional hydraulic pump.

[0037] The present invention is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A decoiler hydraulic control system, characterized in that, It includes a hydraulic pump station, which cooperates with the hydraulic mechanism of the uncoiler line. The hydraulic pump station and the coiler line hydraulic mechanism are controlled by a PLC controller.

2. The hydraulic control system of an uncoiler line according to claim 1, characterized in that: The hydraulic mechanism of the uncoiler line includes a loading trolley valve group, an uncoiler valve group, a mandrel support valve group, a pinch roll valve group, an inlet loop valve group, and an outlet loop valve group. The loading trolley valve group controls the lifting piston cylinder of the loading trolley. The uncoiler valve group controls the expansion and contraction piston cylinder of the uncoiler, the moving piston cylinder of the uncoiler base, the lifting piston cylinder of the pressure roll, and is connected to the hydraulic motor of the pressure roll. The mandrel support valve group controls the lifting piston cylinder of the mandrel support. The pinch roll valve group controls the moving piston cylinder of the feeding table, the lifting piston cylinder of the feeding table, the lifting piston cylinder of the pinch roll, the lifting piston cylinder of the bending roll, and the lifting piston cylinder of the head shear. The inlet loop valve group controls the lifting piston cylinder of the inlet loop. The outlet loop valve group controls the lifting piston cylinder of the outlet loop.

3. An uncoiler hydraulic control system according to claim 2, characterized in that: The servo motor of the hydraulic pump station drives a gear pump. The suction port of the gear pump is connected to the fuel tank. The oil outlet P1 of the gear pump is respectively connected in parallel with the oil inlet P2 of the valve block of the lifting piston cylinder of the loading trolley, the oil inlet P3 of the valve block of the expansion and contraction piston cylinder of the uncoiler, the oil inlet P4 of the valve block of the lifting piston cylinder of the mandrel support, the oil inlet P5 of the valve block of the moving piston cylinder of the feeding table, the oil inlet P7 of the valve block of the lifting piston cylinder of the inlet loop, and the oil inlet P8 of the valve block of the lifting piston cylinder of the outlet loop. The oil return port T1 of the fuel tank is respectively connected in parallel with the oil inlet T2 of the valve block of the lifting piston cylinder of the loading trolley, the oil inlet T3 of the valve block of the expansion and contraction piston cylinder of the uncoiler, the oil inlet T4 of the valve block of the lifting piston cylinder of the mandrel support, the oil inlet T5 of the valve block of the moving piston cylinder of the feeding table, the oil inlet T7 of the valve block of the lifting piston cylinder of the inlet loop, and the oil inlet T8 of the valve block of the lifting piston cylinder of the outlet loop. The oil circuits of the moving piston cylinder of the uncoiler base, the moving piston cylinder of the uncoiler base, the hydraulic motor of the pressure roll are connected to the oil circuit of the lifting piston cylinder of the pressure roll. The oil circuits of the moving piston cylinder of the feeding table, the lifting piston cylinder of the feeding table, the lifting piston cylinder of the pinch roll, the lifting piston cylinder of the bending roll, and the lifting piston cylinder of the head shear are connected.

4. The hydraulic control system of an uncoiler line according to claim 3, wherein: The encoder PG of the rotational speed of the servo motor M1 of the hydraulic pump station is connected to the X3 port of the servo controller SDR. The voltage signal output terminal of the pump port pressure sensor BP1 of the hydraulic pump station is connected to the pump port pressure input terminal AI1 of the servo controller SDR. The flow control analog signal output terminals V0 and M0 of the PLC controller are respectively connected to the flow control analog signal input terminals AI3 and FAC3 of the servo controller SDR. The pressure control analog signal output terminals V1 and M1 of the PLC controller are connected to the pressure control analog signal input terminals AI2 and FAC2 of the servo controller SDR. A servo enable button SB1 is connected between the start signal input terminal DI3 of the servo controller SDR and the common terminal COM.

5. A hydraulic control method for an uncoiler line, characterized in that: It includes the following contents. S1, the servo motor drives the rotational speed of the gear pump to control the flow output. S2, control the torque of the servo motor to control the magnitude of the pump port output pressure.

6. A hydraulic control method for an uncoiler line according to claim 5, characterized in that: The specific content of S1 is as follows. During the process of the servo controller SDR executing the control instructions of the PLC controller, it receives the pump port pressure feedback from the pump port pressure sensor BP1 and the motor speed information feedback from the encoder PG, and adjusts the servo motor speed in real time, thereby controlling the output flow rate of the servo pump in real time.

7. A hydraulic control method for an uncoiler line according to claim 6, characterized in that: The specific content of S2 is as follows. The pressure control analog signal output terminals V1 and M1 of the PLC controller send the magnitude of the pressure signal to the pressure control analog signal input terminals AI2 and FAC2 of the servo controller SDR, and then the servo controller SDR controls the torque of the servo motor to control the pressure at the servo pump port.

8. A hydraulic control method for an uncoiler line according to claim 6, characterized in that: S1 also includes the following content. The flow control analog signal output terminals V0 and M0 of the PLC controller send the magnitude of the flow signal to the flow control analog signal input terminals AI3 and FAC3 of the servo controller SDR, and then the servo controller SDR controls the speed of the servo motor to control the flow rate of the servo pump.

9. A hydraulic control method for an uncoiler line according to claim 7, characterized in that: S2 also includes the following content. When the pump port pressure sensor BP1 detects that the pump port pressure of the servo pump exceeds the set pressure, the torque output of the servo motor is reduced to maintain the set pressure.

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