Anomaly self-diagnosis method for an injection molding machine

Abstract

The application discloses an abnormal self-diagnosis method of an injection molding machine, and has the characteristics of comprising the following steps: an injection molding machine controller outputs power instructions and valve control instructions; at least one performance parameter of the injection molding machine is acquired in real time through the controller; it is judged whether the acquired performance parameter meets preset standards; and a diagnosis result is obtained. The method has the advantages that the relevant performance parameters of the injection molding machine are acquired in real time, it is judged whether the corresponding performance parameters are within the preset standards, thereby realizing abnormal self-diagnosis of the injection molding machine, helping an operator to quickly and accurately diagnose the abnormal reasons of the injection molding machine, reducing the error of human judgment, improving the efficiency of fault handling, reducing the maintenance cost, and improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding machines, in particular to an abnormal self-diagnosis method of an injection molding machine. BACKGROUND

[0002] In the specific production and use process of an injection molding machine, the main controller of the injection molding machine outputs action instructions, which are usually output in two parts. One part is to output power instructions, which send pressure and flow instructions to the driver to drive the motor to control the oil pump to work, thereby providing power for the corresponding action. The other part is to output valve control instructions, which send the opening and closing signals of the valves corresponding to the action through the output points of the controller to the corresponding electromagnetic valves through the lines.

[0003] During the use of the injection molding machine, various action abnormalities often occur, such as the machine not performing the action when the controller outputs the action instruction, or the machine performing action B when the controller outputs action instruction A. There are many reasons for these abnormalities, including whether the motor and oil pump are working normally, whether the valves corresponding to the action control are abnormal, and whether the circuits corresponding to the action control are abnormal. Therefore, the user or maintenance personnel of the equipment need to consider various factors when troubleshooting abnormal problems, which requires high professional skills of the maintenance personnel and makes it difficult and time-consuming to solve the machine abnormalities. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an abnormal self-diagnosis method of an injection molding machine, which makes the specific reasons for the abnormality of the injection molding machine obvious through self-diagnosis, thereby greatly reducing the difficulty of troubleshooting abnormal problems and saving time for abnormal treatment.

[0005] The technical solution adopted by the present application to solve the above technical problem is:

[0006] An abnormal self-diagnosis method of an injection molding machine, comprising the following steps:

[0007] The controller of the injection molding machine outputs power instructions and valve control instructions;

[0008] The controller acquires at least one performance parameter of the injection molding machine in real time;

[0009] It is judged whether the acquired performance parameter meets the preset standard;

[0010] The diagnosis result is obtained.

[0011] The performance parameter includes the signal feedback of the position sensor corresponding to the action, the pressure and flow data feedback of the driver;

[0012] The specific diagnosis is as follows:

[0013] The position sensor has no signal feedback to the controller, indicating that the corresponding action is not performed. According to the pressure and flow data feedback of the driver, the following abnormal diagnosis is made:

[0014] Diagnosis 1: The controller does not obtain the pressure and flow data of the driver, and the diagnosis is that the power output is abnormal, i.e. the motor does not work normally;

[0015] Diagnosis 2: The controller detects that the flow data of the driver is normal, but does not obtain the pressure data of the driver, and diagnoses that the power output is normal, and the overflow valve on the oil line for controlling the corresponding action is abnormal;

[0016] Diagnosis 3: The controller detects that the pressure data of the driver is normal, but does not obtain the flow data of the driver, and diagnoses that the power output is normal, and the electromagnetic control valve on the oil line for controlling the corresponding action is abnormal.

[0017] The performance parameters further include output current data feedback of the output point of the corresponding valve control instruction;

[0018] For the above diagnosis 3, the following further abnormal diagnosis is made:

[0019] Diagnosis 3-1: The controller detects that the corresponding output point has no output current, and diagnoses that the corresponding electromagnetic control valve is not powered, i.e. the related control circuit is open circuit;

[0020] Diagnosis 3-2: The controller detects that the corresponding output point has output current, and the output current is too large, exceeding the preset standard value, and diagnoses that the related control circuit is short circuit;

[0021] Diagnosis 3-3: The controller detects that the corresponding output point has output current, and the output current is normal, and diagnoses that the corresponding electromagnetic control valve is stuck.

[0022] The performance parameters include signal feedback of the position sensor corresponding to the corresponding action and output current data feedback of the output point of the corresponding valve control instruction;

[0023] The action corresponding to the action instruction output by the controller is defined as correct action, and other actions are defined as error action;

[0024] When the controller detects that the position sensor corresponding to the correct action has no signal feedback, but the position sensor corresponding to the error action has signal feedback to the controller, according to the output current data feedback of the output point corresponding to the correct action, the following abnormal diagnosis is made:

[0025] Diagnosis 4: The controller detects that the output point of the correct action has normal output current, and diagnoses that the circuit connection corresponding to the correct action and the error action is abnormal;

[0026] Diagnosis 5: The controller detects that the output point of the correct action has no normal output current, and diagnoses that the related control circuit corresponding to the correct action is open circuit, and the solenoid control valve on the oil circuit corresponding to the error action is stuck;

[0027] When the controller detects that both the position sensor corresponding to the correct action and the position sensor related to the error action have signal feedback, the following abnormal diagnosis is made according to the data feedback of the output current of the output point corresponding to the correct action:

[0028] Diagnosis 6: The controller detects that the output point of the correct action has an output current, and the output current is too large to exceed the preset standard, and diagnoses that the circuit connection corresponding to the correct action and the error action is abnormal;

[0029] Diagnosis 7: The controller detects that the output point of the correct action has a normal output current, and diagnoses that the solenoid control valve on the oil circuit corresponding to the error action is stuck.

[0030] Compared with the prior art, the advantages of the present application are that by acquiring the related performance parameters of the injection molding machine in real time, it is judged whether the corresponding performance parameters are within the preset standard, thereby realizing the abnormal self-diagnosis of the injection molding machine, and the diagnosis result can be presented on the controller, helping the operator to quickly and accurately diagnose the abnormal reason of the injection molding machine, reducing the error of human judgment, improving the efficiency of fault handling, reducing the maintenance cost, and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The abnormal diagnosis flowchart of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in conjunction with the embodiments of the drawings.

[0033] An abnormal self-diagnosis method of an injection molding machine, comprising the following steps:

[0034] The controller of the injection molding machine outputs power instructions and valve control instructions;

[0035] At least one performance parameter of the injection molding machine is acquired in real time by the controller;

[0036] It is judged whether the acquired performance parameter meets the preset standard;

[0037] The diagnosis result is obtained.

[0038] In this specific embodiment, the performance parameters include the signal feedback of the position sensor corresponding to the action setting, the pressure and flow data feedback of the driver;

[0039] The specific diagnosis is as follows:

[0040] The position sensor has no signal feedback to the controller, indicating that the corresponding action is not performed. Based on the pressure and flow data feedback of the driver, the following abnormal diagnosis is made:

[0041] Diagnosis 1: The controller does not obtain the pressure and flow data of the driver, and the diagnosis is that the power output is abnormal, i.e. the motor does not work normally;

[0042] Diagnosis 2: The controller detects that the flow data of the driver is normal, but does not obtain the pressure data of the driver, and diagnoses that the power output is normal, but the overflow valve on the oil line for controlling the corresponding action is abnormal;

[0043] Diagnosis 3: The controller detects that the pressure data of the driver is normal, but does not obtain the flow data of the driver, and diagnoses that the power output is normal, but the electromagnetic control valve on the oil line for controlling the corresponding action is abnormal.

[0044] On the basis of the above abnormal diagnosis, the performance parameters further include output current data feedback of the output point of the corresponding valve control instruction;

[0045] For the above diagnosis 3, the following further abnormal diagnosis is made:

[0046] Diagnosis 3-1: The controller detects that the corresponding output point has no output current, and diagnoses that the corresponding electromagnetic control valve is not powered, i.e. the related control circuit is open circuit;

[0047] Diagnosis 3-2: The controller detects that the corresponding output point has output current, and the output current is too large, exceeding the preset standard value, and diagnoses that the related control circuit is short circuit;

[0048] Diagnosis 3-3: The controller detects that the corresponding output point has output current, and the output current is normal, and diagnoses that the corresponding electromagnetic control valve is stuck.

[0049] On the basis of the above abnormal diagnosis, the performance parameters include signal feedback of the position sensor corresponding to the set action and output current data feedback of the output point of the corresponding valve control instruction;

[0050] Define the action corresponding to the action instruction output by the controller as the correct action, and other actions as the wrong action;

[0051] When the controller detects that the position sensor corresponding to the correct action has no signal feedback, but the position sensor related to the wrong action has signal feedback to the controller, according to the data feedback of the output current of the output point corresponding to the correct action, the following abnormal diagnosis is made:

[0052] Diagnosis 4: The controller detects that the output point of the correct action has normal output current, and diagnoses that the circuit connection corresponding to the correct action and the wrong action is abnormal;

[0053] Diagnosis 5: The controller detects that the output point of the correct action has no normal output current, and diagnoses that the related control circuit corresponding to the correct action is open circuit, and the solenoid control valve on the oil circuit corresponding to the error action is stuck open;

[0054] When the controller detects that both the position sensor corresponding to the correct action and the position sensor corresponding to the error action have signal feedback, according to the data feedback of the output current of the output point corresponding to the correct action, the following abnormal diagnosis is made:

[0055] Diagnosis 6: The controller detects that the output point of the correct action has an output current, and the output current is too large and exceeds the preset standard, and diagnoses that the circuit connection corresponding to the correct action and the error action is abnormal;

[0056] Diagnosis 7: The controller detects that the output point of the correct action has a normal output current, and diagnoses that the solenoid control valve on the oil circuit corresponding to the error action is stuck open.

Claims

1. A method for self-diagnosing abnormalities in an injection molding machine, characterized in that... Includes the following steps: The controller of the injection molding machine outputs power commands and valve control commands; At least one performance parameter of the injection molding machine is acquired in real time through the controller; Determine whether the obtained performance parameters meet the preset standards; A diagnosis was obtained; The performance parameters include the signal feedback from the position sensor corresponding to the action setting, the pressure and flow data feedback from the driver, and the output current data feedback from the output point of the corresponding valve control command. Define the action corresponding to the action command output by the controller as the correct action, and other actions as the incorrect action; The specific diagnosis is as follows: ① If the position sensor does not send a signal back to the controller, it indicates that the corresponding action has not been executed. Based on the pressure and flow data feedback from the driver, the following abnormality diagnosis is performed: Diagnosis 1: The controller did not obtain pressure and flow data from the drive, which is diagnosed as abnormal power output, i.e., the motor is not working properly; Diagnosis 2: The controller detected that the flow data of the drive was normal, but did not obtain the pressure data of the drive. The diagnosis is that the power output is normal, but the overflow valve in the oil circuit used to control the corresponding action is abnormal. Diagnosis 3: The controller detected that the pressure data of the drive was normal, but did not obtain the flow data of the drive. The diagnosis is that the power output is normal, but the solenoid control valve in the oil circuit used to control the corresponding action is abnormal. ② When the controller detects that the position sensor corresponding to the correct action has no signal feedback, but the position sensor related to the incorrect action has a signal feedback to the controller, the following abnormality diagnosis is performed based on the output current data feedback of the output point corresponding to the correct action: Diagnosis 4: The controller detects that the output point of the correct action has normal output current, which is diagnosed as an abnormal circuit connection corresponding to the correct action and the incorrect action. Diagnosis 5: The controller detected that there was no normal output current at the output point of the correct action. The diagnosis is that the control circuit corresponding to the correct action is open-circuited, and the electromagnetic control valve in the oil circuit corresponding to the incorrect action is stuck. When the controller detects signal feedback from both the position sensor corresponding to the correct action and the position sensor related to the incorrect action, it performs the following anomaly diagnosis based on the output current data feedback from the output point corresponding to the correct action: Diagnosis 6: The controller detects that there is output current at the output point of the correct action, and the output current is too large and exceeds the preset standard. The diagnosis is that the circuit connection corresponding to the correct action and the incorrect action is abnormal. Diagnosis 7: The controller detected a normal output current at the output point of the correct action, which was diagnosed as a stuck solenoid control valve in the oil circuit corresponding to the incorrect action.

2. The self-diagnosis method for abnormalities in an injection molding machine as described in claim 1, characterized in that... The performance parameters also include the output current data feedback of the corresponding valve control command output point. Regarding diagnosis 3 above, the following further abnormal diagnoses are made: Diagnosis 3-1: The controller detects no output current at the corresponding output point, which is diagnosed as the corresponding solenoid control valve not being energized, i.e., the related control circuit is open. Diagnosis 3-2: The controller detects that there is output current at the corresponding output point, and the output current is too large, exceeding the preset standard value. The diagnosis is that the relevant control circuit is short-circuited. Diagnosis 3-3: The controller detects that there is output current at the corresponding output point, and the output current is normal. The diagnosis is that the corresponding solenoid control valve is stuck.

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