CN-121989317-A - Hydraulic control system and method for embossing dividing and cutting machine

CN121989317ACN 121989317 ACN121989317 ACN 121989317ACN-121989317-A

Abstract

The invention relates to the technical field of automatic control, and discloses a hydraulic control system and method of an embossing dividing and cutting machine. According to the method, the hydraulic pump is driven by the servo motor, and the precise rising, stable embossing and stable descending of the embossing seat are realized by combining a position and moment closed-loop control mode. The embossing stage is switched to moment control to stably apply pressure, and the descending stage realizes stable separation through dynamic unloading moment. The system also has the functions of mode smooth switching, real-time pressure feedback adjustment and fault safety protection, effectively improves the processing precision, efficiency and reliability of the embossing dividing and cutting machine, and reduces the damage to workpieces and the fault rate of equipment.

Inventors

HU JIAN
Bai jia

Assignees

南京鑫达智能装备有限公司

Dates

Publication Date: 20260508
Application Date: 20260304

Claims (10)

1. A method of hydraulic control of an embossed slitter, the method comprising: When the embossing seat lifting button is triggered, the control system enables the servo motor and controls the servo motor to drive the hydraulic pump to output hydraulic oil, and the flow and the direction of the hydraulic oil are adjusted based on the position control mode to push the servo hydraulic cylinder to drive the embossing seat to lift; When the displacement of the servo hydraulic cylinder is detected to reach the embossing working position, the control system smoothly switches the control mode of the servo motor from the position control mode to the moment control mode, and the output pressure of the hydraulic pump is controlled by the servo motor, so that the servo hydraulic cylinder applies the embossing pressure according to a preset given moment value; When the descending button of the embossing seat is triggered, the control system controls the servo motor to operate in a moment control mode, sets an unloading moment instruction opposite to the embossing pressure direction, drives the hydraulic pump to reverse, and enables the rodless cavity of the servo hydraulic cylinder to release pressure so as to separate the embossing seat from a workpiece; After the pressure relief is finished, the control mode of the servo motor is switched to a position control mode or a speed control mode, and the embossing seat is controlled to descend to a preset lower limit position.
2. The hydraulic control method of an embossing slitting machine according to claim 1, wherein the adjusting the flow and direction of the hydraulic oil specifically comprises: the control system constructs a position closed-loop control loop taking the displacement of the servo hydraulic cylinder as a feedback quantity; The position closed-loop control circuit generates a command signal for controlling the rotating speed of the servo motor according to the deviation between the preset embossing working position and the actual displacement of the servo hydraulic cylinder detected in real time by the displacement sensor; The flow rate of hydraulic oil output by the hydraulic pump is controlled by adjusting the rotating speed of the servo motor, and the flowing direction of the hydraulic oil is controlled by changing the rotating direction of the servo motor, so that the servo hydraulic cylinder is driven to drive the embossing seat to rise to an embossing working position according to the set speed parameter; wherein the displacement sensor is rigidly connected or coaxially installed with the servo hydraulic cylinder.
3. The hydraulic control method of an embossing slitter of claim 1, wherein the smoothly switching to the torque control mode comprises: After the switching instruction is sent out, the control system captures the current output torque value of the servo motor in the position control mode as an initial torque instruction of the torque control mode, and in a preset transition time, the torque instruction is transited from the initial torque value to a preset given torque value according to a preset transition function.
4. A method of hydraulic control of an embossing slitter as set forth in claim 3, wherein the applying an embossing pressure comprises: The control system collects the pressure value of the hydraulic system detected by the pressure sensor in real time and converts the pressure value into an equivalent servo motor output torque feedback value; The control system compares a preset given moment value with a moment feedback value, and adjusts an output torque command of the servo motor in real time through a moment closed-loop control algorithm based on a difference value of the preset given moment value, so that the output pressure of the hydraulic pump corresponds to the given moment value; the pressure sensor is arranged in an oil inlet pipeline or a pressure cavity of the servo hydraulic cylinder.
5. The hydraulic control method of an embossing slitting machine according to claim 4, wherein the given torque value is set in the following manner: And inputting a target embossing pressure value through a human-computer interface, and calculating and setting the given moment value by a control system according to a corresponding relation curve between the output torque of the servo motor and the pressure of the hydraulic system, which are calibrated and stored in advance.
6. The hydraulic control method of an embossing slitter of claim 1, wherein the driving the hydraulic pump to reverse comprises: After the embossing seat descending button is triggered, the control system keeps the servo motor to operate in a moment control mode; switching a moment command of the servo motor from a given moment value for maintaining embossing pressure currently to the unloading moment command; the unloading moment command drives the servo motor to output torque with the opposite rotation direction to the embossing, and drives the hydraulic pump to rotate along the reverse oil discharge direction; The reverse rotation of the hydraulic pump enables reverse oil flow to be generated in a hydraulic pipeline connected with the hydraulic pump, the pressure in a rodless cavity of the servo hydraulic cylinder is released, and stable pressure relief separation between the embossing seat and the workpiece is realized; during the pressure relief process, the unloading moment command can be dynamically adjusted according to the system pressure feedback.
7. The hydraulic control method of an embossing slitting machine according to claim 1, wherein the determination condition for the completion of the pressure relief is: the control system continuously monitors the pressure of the hydraulic system, and when the monitored pressure value is reduced to be lower than a preset pressure relief completion threshold pressure, the pressure relief completion is judged.
8. The hydraulic control method of an embossing slitter of claim 7, wherein the switching of the control mode of the servo motor to the position control mode or the speed control mode comprises: after the control system judges that the pressure relief is finished, reducing the moment instruction of the servo motor to zero in a preset transition time according to a preset transition function; After the output torque of the servo motor is reduced to zero, a control mode switching operation is performed to switch the control mode of the servo motor from the torque control mode to the position control mode or the speed control mode.
9. The hydraulic control method of an embossing slitting machine according to claim 8, wherein the control system executes a fail-safe program if the control system detects that the real-time output torque of the servo motor exceeds a preset safe torque threshold value during the process of controlling the embossing seat to descend to a preset lower limit; the fault safety program comprises the steps of cutting off an enabling signal of the servo motor, controlling the hydraulic pump to stop outputting hydraulic oil, and simultaneously triggering the audible and visual alarm device; the safety moment threshold is set according to the sum of the expected moment and a preset margin value when the embossing seat descends in an idle load mode.
10. An embossing slitter hydraulic control system, characterized in that the system is adapted to realize an embossing slitter hydraulic control method according to any one of claims 1 to 9, comprising a servo motor, a hydraulic pump, a servo hydraulic cylinder, a displacement sensor, a pressure sensor, a man-machine interface, an audible and visual alarm device and a control system; The servo motor is in driving connection with the hydraulic pump, the hydraulic pump is connected with a rodless cavity of the servo hydraulic cylinder through a hydraulic pipeline, and a piston rod of the servo hydraulic cylinder is fixedly connected with the embossing seat; the displacement sensor is coaxially arranged with the servo hydraulic cylinder, and the pressure sensor is arranged in an oil inlet pipeline or a pressure cavity of the servo hydraulic cylinder; the man-machine interface is used for inputting control parameters, and the audible and visual alarm device is used for fault alarm; The control system is respectively and electrically connected with the servo motor, the displacement sensor, the pressure sensor, the human-computer interface and the audible-visual alarm device, and is used for controlling the operation mode switching of the servo motor and executing hydraulic control based on sensor feedback.

Description

Hydraulic control system and method for embossing dividing and cutting machine Technical Field The invention relates to the technical field of automatic control, in particular to a hydraulic control system and method of an embossing dividing and cutting machine. Background In the hydraulic control system of the conventional embossing slitter, fixed mode control is generally adopted, and it is difficult to dynamically adjust the control strategy according to the working stage (such as ascending, embossing and descending), so that the control accuracy and stability are insufficient. Particularly, in the embossing process, unstable pressure control is easy to cause workpiece damage or equipment overload. Meanwhile, the existing system lacks a smooth transition mechanism when the mode is switched (such as position control to torque control), so that mechanical impact and pressure fluctuation are easy to generate, and the processing quality and the service life of equipment are influenced. In addition, the traditional system lacks real-time pressure feedback and dynamic adjustment capability, is difficult to adapt to the processing requirements of different workpieces, and limits the improvement of production efficiency and product quality. Disclosure of Invention Aiming at the technical defects, the invention aims to provide a hydraulic control system and method for an embossing and slitting machine, which solve the problems of low hydraulic control precision, poor stability and unsmooth mode switching of the conventional embossing and slitting machine. In order to solve the technical problems, the invention adopts the following technical scheme: in a first aspect, the present invention provides a hydraulic control method for an embossing slitter, the method comprising: When the embossing seat lifting button is triggered, the control system enables the servo motor and controls the servo motor to drive the hydraulic pump to output hydraulic oil, and the flow and the direction of the hydraulic oil are adjusted based on the position control mode to push the servo hydraulic cylinder to drive the embossing seat to lift; When the displacement of the servo hydraulic cylinder is detected to reach the embossing working position, the control system smoothly switches the control mode of the servo motor from the position control mode to the moment control mode, and the output pressure of the hydraulic pump is controlled by the servo motor, so that the servo hydraulic cylinder applies the embossing pressure according to a preset given moment value; When the descending button of the embossing seat is triggered, the control system controls the servo motor to operate in a moment control mode, sets an unloading moment instruction opposite to the embossing pressure direction, drives the hydraulic pump to reverse, and enables the rodless cavity of the servo hydraulic cylinder to release pressure so as to separate the embossing seat from a workpiece; After the pressure relief is finished, the control mode of the servo motor is switched to a position control mode or a speed control mode, and the embossing seat is controlled to descend to a preset lower limit position. In a possible implementation manner of the first aspect, the adjusting the flow rate and the direction of the hydraulic oil specifically includes: the control system constructs a position closed-loop control loop taking the displacement of the servo hydraulic cylinder as a feedback quantity; The position closed-loop control circuit generates a command signal for controlling the rotating speed of the servo motor according to the deviation between the preset embossing working position and the actual displacement of the servo hydraulic cylinder detected in real time by the displacement sensor; The flow rate of hydraulic oil output by the hydraulic pump is controlled by adjusting the rotating speed of the servo motor, and the flowing direction of the hydraulic oil is controlled by changing the rotating direction of the servo motor, so that the servo hydraulic cylinder is driven to drive the embossing seat to rise to an embossing working position according to the set speed parameter; wherein the displacement sensor is rigidly connected or coaxially installed with the servo hydraulic cylinder. Preferably, in a possible implementation manner of the first aspect, the smoothly switching to the torque control mode includes: After the switching instruction is sent out, the control system captures the current output torque value of the servo motor in the position control mode as an initial torque instruction of the torque control mode, and in a preset transition time, the torque instruction is transited from the initial torque value to a preset given torque value according to a preset transition function. Preferably, in a possible implementation manner of the first aspect, the embossing pressure applying process includes: The control system collects the pressure value of the hydr