A detection system for improving the automatic roll changing side shift stability of a continuous rolling mill

Abstract

The present application relates to the technical fields of metallurgical acid continuous rolling mill equipment detection and automatic control, a detection system for improving the automatic roll changing side shift stability of a continuous rolling mill, which is used in an acid continuous rolling mill roll changing vehicle, the roll changing vehicle comprising a base, a side shift frame capable of side shift movement relative to the base, a side shift driving device, a PLC control unit, a hardware detection assembly, and a side shift driving frequency converter; the hardware detection assembly comprising a proximity switch, an induction baffle, and an L-shaped sensor support; the L-shaped sensor support being fixedly installed on the base of the roll changing vehicle, the proximity switch being installed on the L-shaped sensor support, and the induction baffle being fixedly connected to the side shift frame of the roll changing vehicle; the proximity switch and the induction baffle being arranged in an end face opposite manner (when the side shift frame moves relative to the base, the proximity switch and the induction baffle always have an end face opposite arrangement).

Description

Technical Field

[0001] The present invention relates to the technical field of equipment detection and automatic control for metallurgical acid tandem rolling mills, and in particular to a detection system for improving the lateral movement stability of automatic roll change of a tandem rolling mill and a control method thereof. Background Art

[0002] As the output and speed of the acid tandem rolling unit are increased, the rolling rhythm is accelerated, and the frequency of roll change operations is significantly increased. The efficiency of roll change operations has become an important factor restricting the capacity release of the tandem rolling unit.

[0003] The roll change carts matched with the existing acid rolling units have the defect of insufficient operation stability, making it difficult to realize fully automatic roll change operations. Fault traceability analysis shows that the self-weight of the roll change cart body is relatively small, and the cart body (lateral movement frame) shakes with an amplitude of 2-3mm during the lateral movement operation of loading rolls; the existing detection scheme adopts the mode of side induction of the baffle plate by the proximity switch, and the shaking of the cart body will cause an instantaneous relative offset between the proximity switch and the induction baffle block, the offset exceeds the effective induction threshold of the sensor, the control system misjudges the lateral movement position, and a signal loss fault occurs, forcing the roll change operation to switch to semi-automatic or manual mode, which restricts the production rhythm.

[0004] The existing lateral movement detection assembly is arranged under the floor, so the maintenance space is narrow and the fault troubleshooting is inconvenient. At the same time, there are also the following problems: uneven floor easily causes the baffle plate to be damaged by interference; track deformation causes the lateral movement device to tilt, resulting in abnormal signal feedback; the proximity switch is easily bumped during the roll lifting operation; the shaking amplitude of the cart body changes with the change of the load carried by the roll change cart; the original detection device has poor maintainability; the drive system lacks deceleration configuration, and the large cart has large motion inertia, which easily exceeds the limit position. Contents of the Invention

[0005] The present invention aims to overcome the deficiencies of the prior art, and solve the technical problems that the acid tandem rolling roll change cart is affected by the mechanical shaking of the cart body, the lateral movement in-place signal is easy to be lost, and the operation reliability of fully automatic roll change is poor.

[0006] The technical scheme adopted by the present invention is as follows: a detection system for improving the lateral movement stability of automatic roll change of a tandem rolling mill, which is used for a roll change cart of an acid tandem rolling unit, the roll change cart comprises a base, a lateral movement frame capable of performing lateral movement relative to the base, a lateral movement driving device, and a PLC control unit; and further comprises a hardware detection assembly and a lateral movement driving frequency converter; The hardware detection assembly comprises a proximity switch, an induction baffle plate and an L-shaped sensor bracket; the L-shaped sensor bracket is fixedly installed on the base of the roll change cart, the proximity switch is installed on the L-shaped sensor bracket, and the induction baffle plate is fixedly connected to the lateral movement frame of the roll change cart; the end faces of the proximity switch and the induction baffle plate are arranged to face each other (when the lateral movement frame performs lateral movement relative to the base, the end faces of the proximity switch and the induction baffle plate always face each other); The PLC control unit is equipped with a time delay relay. The signal input terminal of the time delay relay is electrically connected to the proximity switch to receive the lateral movement signal output by the proximity switch and to perform a time delay lockout output on the lateral movement signal. The lateral drive frequency converter is electrically connected to the lateral drive device of the roll changing car. The lateral drive frequency converter is equipped with a deceleration control function to control the lateral movement of the roll changing car to decelerate.

[0007] The L-shaped sensor bracket includes two rectangular plates perpendicular to each other. One rectangular plate has a sensor mounting hole (proximity switch mounting hole), and the other rectangular plate has a sensor bracket mounting hole (for connection to the sensor bracket base). The L-shaped sensor bracket is mounted on the sensor bracket base in an adjustable position via a sensor bracket adjustable position moving slot. The sensor bracket base is mounted on the base of a roller changing trolley (including a roller changing trolley and a roller changing carriage). The sensing end face of the sensing baffle is opposite to the sensing end face of the proximity switch.

[0008] The induction baffle is welded and fixed to the front side of the lateral displacement frame.

[0009] The delay time of the delayed relay's delayed lockout output is 1 second.

[0010] The deceleration time of the side-shift drive frequency converter is 2 seconds.

[0011] The hardware detection components include an inlet-side hardware detection component and an outlet-side hardware detection component. The inlet-side hardware detection component includes an inlet-side proximity switch, an inlet-side sensing baffle, and an inlet-side L-shaped sensor bracket. The outlet-side hardware detection component includes an outlet-side proximity switch, an outlet-side sensing baffle, and an outlet-side L-shaped sensor bracket.

[0012] A control method for improving the lateral displacement stability of automatic roll changing in a continuous rolling mill includes the following steps: S1. Hardware assembly: Fix the L-shaped sensor bracket to the roller changing car base, fix the sensing baffle to the side shift frame, install the proximity switch on the L-shaped sensor bracket, and adjust the proximity switch so that the proximity switch is directly opposite the end face of the sensing baffle. S2, Lateral Movement: The lateral movement drive frequency converter drives the lateral movement frame of the roller changing car to move; when the lateral movement deceleration position signal is received, the lateral movement drive frequency converter executes deceleration control to reduce the movement speed of the lateral movement frame; S3, Signal Delay Locking: When the proximity switch detects that the side-shifting frame is in place, it outputs a side-shifting completion signal to the PLC control unit; the PLC control unit calls the delay relay to time, and after the timer reaches the set delay time, it locks and outputs the side-shifting completion signal to the outside. S4. Status Maintenance: Continuously outputs the lateral displacement positioning signal after locking to complete the roll changing operation.

[0013] The beneficial effects of this invention are as follows: At the hardware level, the proximity switch and the sensing baffle are arranged with their end faces facing each other, which reduces the impact of relative displacement caused by vehicle body swaying on the detection signal; the hardware detection components are arranged inside the track, facilitating inspection and maintenance and avoiding the risk of damage to parts from roller impacts or floor interference; the L-shaped sensor bracket has an adjustable position movement slot, which can compensate for assembly deviations caused by slight track deformation. At the control level, the PLC is configured with a time-delay relay to achieve delayed locking output of the lateral movement positioning signal. Unlike millisecond-level debouncing that filters electromagnetic interference, this invention provides fault-tolerant processing for instantaneous signal loss caused by vehicle body mechanical swaying; the lateral movement drive frequency converter is configured with a deceleration control function to reduce the impact upon positioning, reduce the amplitude of vehicle body swaying, and prevent exceeding the limit position. The hardware detection structure, signal delay locking logic, and frequency conversion deceleration control of this invention work synergistically. Using only the end-face sensing structure, the impact upon positioning still poses a swaying risk; relying solely on the delay locking logic has limited compensation effect in side sensing mode; and configuring only frequency conversion deceleration cannot completely eliminate vehicle body swaying. Only the combination of these three elements can effectively solve the specific fault addressed in this application. Industrial field tests have shown that this invention can effectively eliminate the failure of the roll shift signal loss on the roll changing car. Under test conditions, the position detection signal accuracy can reach 100%, reducing the need to switch between semi-automatic and manual roll changing. It is suitable for the production needs of high-speed rolling and high-frequency roll changing in the unit. After the modification, the single roll changing operation time is shortened from 20 minutes to 15 minutes, which can reduce spare parts wear, reduce equipment operation and maintenance costs, and bring considerable production economic benefits. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the process of this invention; Figure 2 This is a schematic diagram of the improved lateral displacement detection according to the present invention; Figure 3 This is a schematic diagram of the lateral displacement detection before the improvement of this invention; Figure 4 This is a schematic diagram of the sensor bracket of the present invention; Figure 5 This is a schematic diagram of the sensor bracket base of the present invention; Among them, 1. Push roller area, 2. Lateral displacement detection baffle, 3. Inlet side lateral displacement proximity switch, 4. Inlet side lateral displacement deceleration proximity switch, 5. Push roller position of push-pull trolley, 6. Spare roller area, 7. Outlet side lateral displacement deceleration proximity switch, 8. Outlet side lateral displacement proximity switch, 9. Inlet side lateral displacement detection baffle, 10. Outlet side lateral displacement detection baffle, 11. Sensor mounting hole, 12. Sensor bracket mounting hole, 13. Sensor bracket adjustable position moving groove, 14. Sensor bracket base. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

[0016] A detection system for improving the lateral movement stability of automatic roll changing in continuous rolling mills is used for roll changing trolleys in acid continuous rolling mills. The roll changing trolley includes a base (roll changing trolley), a lateral movement frame (roll changing carriage) that can move laterally relative to the base, a lateral movement drive device (variable frequency motor), a PLC control unit, hardware detection components, and a lateral movement drive frequency converter.

[0017] The hardware detection components include a proximity switch, a sensing baffle, and an L-shaped sensor bracket; the L-shaped sensor bracket is fixedly installed on the base of the roll changing car, the proximity switch is installed on the L-shaped sensor bracket, and the sensing baffle is fixed to the lateral movement frame of the roll changing car; the proximity switch and the sensing baffle are arranged with their end faces facing each other (when the lateral movement frame moves laterally relative to the base, the proximity switch and the sensing baffle are always arranged with their end faces facing each other).

[0018] The lateral shift frame (roll changing trolley) is mainly mounted on the roll changing car body and includes two sets of movements: push-pull (entering and exiting the mill stand) and lateral shift (moving laterally to the roll changing position). The push-pull (entering and exiting the mill stand) is responsible for pushing and pulling the roll group back and forth along the rolling centerline from the mill stand; the lateral shift (moving laterally to the roll changing position) realizes the lateral switching between the old roll station and the new roll station, allowing the clamps to align with different roll groups. The entire lateral shift frame is mounted on the roll changing car body.

[0019] From the inside of the mill archway window, along the docking track, all the way to the roll seat track on the roll changing trolley's side-shifting slide, this entire track section accessible to the rolls for entry and exit and the side-shifting frame is called the roll pushing area 1. The push-pull trolley's roll pushing position (roll pushing point) is a logical / mechanical single-point position (station), belonging to a target stopping point within the roll pushing area. It refers to the calibrated position where the push-pull trolley extends forward, and the hook just reaches the point where it can hook the roll bearing seat / roll head and begin the roll pushing / pulling action. This position is calibrated by a proximity switch / encoder, and the "roll pushing position" signal in the HMI is this point. For example... Figure 3 As shown, in the prior art, a side-sensing baffle structure is adopted. The side-sensing baffle structure is between the inlet-side side-shifting proximity switch 3 and the inlet-side side-shifting deceleration proximity switch 4 and the inlet-side side-shifting detection baffle 9; the side-sensing baffle structure is between the outlet-side side-shifting deceleration proximity switch 7 and the outlet-side side-shifting proximity switch 8 and the outlet-side side-shifting detection baffle 10. The swaying of the side-shifting frame (roller changing trolley) causes the relative position between the proximity switch and the sensing baffle to change instantaneously. When the swaying amplitude is 2-3mm, it may exceed the sensing distance threshold of the proximity switch, causing the controller to misjudge as "leaving the position".

[0020] like Figure 2As shown, this invention improves upon this by using an L-shaped sensor bracket to transform the proximity switch (including the inlet-side and outlet-side lateral movement proximity switches) from a side-sensing baffle structure to an end-face sensing baffle structure. This fundamentally solves the problem that the relative position between the proximity switch and the sensing baffle changes instantaneously due to the swaying of the side-moving frame (roller changing trolley), with a sway amplitude of 2-3mm, which may exceed the sensing distance threshold of the proximity switch and cause the controller to misjudge it as "leaving the position". The reliability of signal detection is significantly improved.

[0021] like Figure 4 and 5 As shown, the L-shaped sensor bracket includes two rectangular plates perpendicular to each other. One rectangular plate has a sensor mounting hole 11 (proximity switch mounting hole), and the other rectangular plate has a sensor bracket mounting hole 12 (for connection to the sensor bracket base). The L-shaped sensor bracket is mounted on the sensor bracket base 14 in an adjustable position via a sensor bracket adjustable position moving slot 13. The sensor bracket base is mounted on the base of a roller changing trolley (including a roller changing trolley and a roller changing carriage). The sensing end face of the sensing baffle is opposite to the sensing end face of the proximity switch. The sensing baffle is welded and fixed to the front side of the side-shifting frame.

[0022] In one embodiment, the L-shaped sensor bracket and sensor bracket base are made of iron. The sensor bracket base is 15cm long and 8cm wide. The adjustable position moving slot 13 of the sensor bracket is 13cm long and 10mm wide. The sensor mounting hole 11 has a diameter of 3cm, and the sensor bracket mounting hole 12 consists of two holes with a diameter of 8mm.

[0023] The PLC control unit is equipped with a time delay relay. The signal input terminal of the time delay relay is electrically connected to the proximity switch to receive the lateral movement signal output by the proximity switch and to perform a time delay lockout output on the lateral movement signal.

[0024] The lateral drive frequency converter is electrically connected to the lateral drive device of the roll changing car. The lateral drive frequency converter is equipped with a deceleration control function to control the lateral movement of the roll changing car to decelerate.

[0025] The delay time of the delayed relay's delayed lockout output is 1 second.

[0026] The deceleration time of the side-shift drive frequency converter is 2 seconds.

[0027] The hardware detection components include an inlet-side hardware detection component and an outlet-side hardware detection component. The inlet-side hardware detection component includes an inlet-side proximity switch (including an inlet-side side-shift to position proximity switch and an inlet-side side-shift deceleration position proximity switch), an inlet-side sensing baffle, and an inlet-side L-shaped sensor bracket. The outlet-side hardware detection component includes an outlet-side proximity switch (an outlet-side side-shift deceleration position proximity switch and an outlet-side side-shift to position proximity switch), an outlet-side sensing baffle, and an outlet-side L-shaped sensor bracket.

[0028] A control method for improving the lateral displacement stability of automatic roll changing in a continuous rolling mill includes the following steps: S1. Hardware assembly: Fix the L-shaped sensor bracket to the roller changing car base, fix the sensing baffle to the side shift frame, install the proximity switch on the L-shaped sensor bracket, and adjust the proximity switch so that the proximity switch is directly opposite the end face of the sensing baffle. S2, Lateral Movement: The lateral movement drive frequency converter drives the lateral movement frame of the roller changing car to move; when the lateral movement deceleration position signal is received, the lateral movement drive frequency converter executes deceleration control to reduce the movement speed of the lateral movement frame; S3, Signal Delay Locking: When the proximity switch detects that the side-shifting frame is in place, it outputs a side-shifting completion signal to the PLC control unit; the PLC control unit calls the delay relay to time, and after the timer reaches the set delay time, it locks and outputs the side-shifting completion signal to the outside. S4. Status Maintenance: Continuously outputs the lateral displacement positioning signal after locking to complete the roll changing operation.

Claims

1. A detection system for improving the lateral displacement stability of an automatic roll changer in a continuous rolling mill, used in a roll changer trolley of a pickling continuous rolling mill, the roll changer trolley comprising a base, a lateral displacement frame capable of lateral displacement relative to the base, a lateral displacement drive device, and a PLC control unit; characterized in that, It also includes hardware detection components and side-shift drive frequency converters; The hardware detection components include a proximity switch, a sensing baffle, and an L-shaped sensor bracket; the L-shaped sensor bracket is fixedly installed on the base of the roll changing car, the proximity switch is installed on the L-shaped sensor bracket, and the sensing baffle is fixedly connected to the side-shifting frame of the roll changing car; the proximity switch and the sensing baffle are arranged with their end faces facing each other. The PLC control unit is equipped with a time delay relay. The signal input terminal of the time delay relay is electrically connected to the proximity switch to receive the lateral movement signal output by the proximity switch and to perform a time delay lockout output on the lateral movement signal. The lateral drive frequency converter is electrically connected to the lateral drive device of the roll changing car. The lateral drive frequency converter is equipped with a deceleration control function to control the lateral movement of the roll changing car to decelerate.

2. The detection system according to claim 1, characterized in that: The L-shaped sensor bracket includes two rectangular plates perpendicular to each other. One rectangular plate has an adjustable position moving groove, and the other rectangular plate has a proximity switch mounting hole. The L-shaped sensor is mounted on the base of the roller changing car in an adjustable position through the adjustable position moving groove. The proximity switch is mounted on the L-shaped sensor through the proximity switch mounting hole. The sensing end face of the sensing baffle and the sensing end face of the proximity switch are opposite to each other.

3. The detection system according to claim 2, characterized in that: The induction baffle is welded and fixed to the front side of the lateral displacement frame.

4. The detection system according to claim 1, characterized in that: The delay time of the delayed relay's delayed lockout output is 1 second.

5. The detection system according to claim 1, characterized in that: The deceleration time of the side-shift drive frequency converter is 2 seconds.

6. The detection system according to any one of claims 1-5, characterized in that: The hardware detection components include an inlet-side hardware detection component and an outlet-side hardware detection component. The inlet-side hardware detection component includes an inlet-side proximity switch, an inlet-side sensing baffle, and an inlet-side L-shaped sensor bracket. The outlet-side hardware detection component includes an outlet-side proximity switch, an outlet-side sensing baffle, and an outlet-side L-shaped sensor bracket.

7. A control method for improving the lateral displacement stability of automatic roll changing in a continuous rolling mill, characterized in that, The detection system according to any one of claims 1-6 includes the following steps: S1. Hardware assembly: Fix the L-shaped sensor bracket to the roller changing car base, fix the sensing baffle to the side shift frame, install the proximity switch on the L-shaped sensor bracket, and adjust the proximity switch so that the proximity switch is directly opposite the end face of the sensing baffle. S2, Lateral Movement: The lateral movement drive frequency converter drives the lateral movement frame of the roller changing car to move; when the lateral movement deceleration position signal is received, the lateral movement drive frequency converter executes deceleration control to reduce the movement speed of the lateral movement frame; S3, Signal Delay Locking: When the proximity switch detects that the side-shifting frame is in place, it outputs a side-shifting completion signal to the PLC control unit; the PLC control unit calls the delay relay to time, and after the timer reaches the set delay time, it locks and outputs the side-shifting completion signal to the outside. S4. Status Maintenance: Continuously outputs the lateral displacement positioning signal after locking to complete the roll changing operation.

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