Servo press pressure sensor loop abnormity detection method
A pressure sensor and abnormal detection technology, applied in presses, force/torque/work measuring instruments, instruments, etc., can solve the problems of low reliability, disconnection, complicated implementation, etc., to improve processing accuracy and safety, Avoid crushing the workpiece, the effect of strong adaptability
Inactive Publication Date: 2020-07-17
SUZHOU LINGHOU ROBOT
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Problems solved by technology
[0003] However, in the process of pressure closed-loop control, pressure overshoot can easily lead to sensor damage. In addition, sensor disconnection and signal converter disconnection often occur. At this time, the pressing process will fail, the workpiece will be crushed, and even the equipment will be damaged.
There are many factors in the abnormality of the pressure sensor circuit, and a special hardware circuit is usually required for detection, which makes the entire system costly, complex to implement and low in reliability
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[0031] Example: such as figure 1 As shown, the servo press system usually includes a host computer, a servo driver, a servo motor, a transmission mechanism (screw module or electric cylinder) and a pressure sensor. The servo drive drives the servo motor to rotate, and the screw module or electric cylinder converts the rotational motion of the motor into linear motion to realize the downward movement of the indenter. The pressure acting on the workpiece is converted into an electrical signal by the pressure sensor and fed back to the servo drive, and then passed The pressure control module integrated in the servo driver realizes pressure closed-loop control.
[0032] This application provides a method for detecting the abnormality of the pressure sensor circuit of the servo press. The detection process is as follows: figure 2 shown, including the following steps:
[0033] Step 1: Perform pressing state detection during operation to determine the corresponding working mode of...
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The invention discloses a servo press pressure sensor loop abnormity detection method. The method comprises the following steps that pressing state detection is performed in an operation process, anda work mode corresponding to a servo driver is determined; whether or not a position mode is achieved in the current state is judged according to a pressing state detection result; when it is judged that a non-position mode is achieved, pressure loaded on a workpiece is estimated through software according to the information of a servo motor; the estimated pressure is compared with pressure fed back by a pressure sensor loop, and when the deviation is larger than a threshold value, it is judged that the sensor loop is detected to be abnormal. Abnormity detection of the pressure sensor loop isachieved through a software method, so that the cost is low, simplicity and reliability are achieved, limitation of hardware loops and sensor types is avoided, and the adaptability is high.
Description
technical field [0001] The invention belongs to the technical field of precision pressing and relates to a method for detecting abnormality of a pressure sensor circuit of a servo press. Background technique [0002] Electronic products such as mobile phones and tablet computers usually require processing such as dispensing and assembly. After the product is glued, the workpiece needs to be kept under constant pressure before proceeding to the next step. Traditional manual processing has low efficiency and is suitable for occasions with low precision requirements, but cannot meet the process occasions with high pressure precision requirements. Usually, in some pressure control devices, the force applied to the workpiece is obtained directly through the force sensor, which is compared with the reference force signal as a feedback signal to obtain the force error, and then the feedback controller is designed to realize the output force control of the motion platform. Higher p...
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Login to View More IPC IPC(8): B30B15/14G01L5/00
CPCB30B15/148G01L5/0066G01L5/0076
Inventor 柳刚田立志王德保闫永金高闯张锐
Owner SUZHOU LINGHOU ROBOT