Intelligent energy storage control method and system for die casting machine

Abstract

The application provides a die casting machine intelligent energy storage control method and system, the method comprises the following steps: energy storage self-checking: when the energy storage tank is exhausted and the hydraulic oil air bag reaches a relaxed state, the locking nitrogen pressure value is obtained, it is judged whether the locking nitrogen pressure value belongs to the first preset nitrogen pressure range, if not, an alarm is given, if yes, the energy storage target nitrogen pressure value is determined; determining the energy storage target nitrogen pressure value: selecting the energy storage mode, obtaining the energy storage target nitrogen pressure value, and controlling the energy storage tank to start energy storage according to the obtained energy storage target nitrogen pressure value; energy storage judgment: obtaining the real-time nitrogen pressure value in the energy storage process, judging the size relationship between the real-time nitrogen pressure value and the energy storage target nitrogen pressure value, and obtaining a judgment result; energy storage control: controlling the energy storage state of the energy storage tank according to the judgment result of the energy storage judgment. Thus, the die casting machine intelligent energy storage control can be realized.

Description

Technical Field

[0001] This invention relates to the field of die-casting machine control technology, and more specifically to a method and system for intelligent energy storage control of die-casting machines. Background Technology

[0002] A die-casting machine is a mechanical device used to manufacture metal parts. It heats metal material to a molten state, pours it into a pre-designed mold, and then cools and solidifies it to create metal parts with various shapes and sizes. The energy storage device in a die-casting machine refers to the device that provides the energy required for the die-casting operation, storing and releasing the power needed during the process. Die-casting machine energy storage refers to storing energy during the operation of the die-casting machine so that it can be released when needed, thereby improving the machine's operating efficiency.

[0003] In the current die-casting industry, hydraulic systems typically use pneumatic accumulators to store energy. During the energy storage operation, the hydraulic pump supplies oil, causing the pneumatic accumulator to deform and store energy. During the injection operation, the accumulator releases energy, and hydraulic oil is continuously discharged into the injection cylinder, pushing the hammer to inject molten metal into the mold. Before energy storage, a check is performed to ensure the accumulator can store energy properly. This check usually relies on the operator's experience to determine if the nitrogen level in the accumulator is sufficient. After the accumulator check, the target nitrogen pressure is set manually. This setting depends on the operator's experience and directly determines the amount of energy stored, thus affecting the quality of the die-cast product. Therefore, a suitable target nitrogen pressure must be set. Once the target nitrogen pressure is set, the operator manually presses the energy storage button to initiate the energy storage operation of the die-casting machine's accumulator.

[0004] However, in actual production, there are at least three shortcomings, which are the technical problems that this invention aims to solve:

[0005] 1. Regarding the self-inspection of energy storage devices, since the judgment on whether the nitrogen in the energy storage device is sufficient is based on the experience of the staff, it is affected by the subjective consciousness and experience level of the operators, and therefore has a certain degree of subjectivity. Secondly, manual inspection requires time and human resources, which is inefficient, especially in large-scale production, and will become a bottleneck.

[0006] 2. Regarding the target nitrogen pressure for energy storage, since there is no suitable control technology to assist staff in setting the target nitrogen pressure, operators often need to frequently adjust the target nitrogen pressure based on production experience, which leads to cumbersome operation.

[0007] 3. Regarding energy storage control, on the one hand, after the target nitrogen pressure for energy storage is set, the energy storage operation of the die-casting machine's energy storage device is performed by manually pressing the energy storage button, which is not convenient for automated production. On the other hand, frequent adjustments to the target nitrogen pressure for energy storage also make it inconvenient to control energy storage, thereby reducing work efficiency.

[0008] In summary, there is an urgent need for a method and system that can perform energy storage self-testing, easily set the target nitrogen pressure for energy storage, and perform intelligent energy storage control of the die-casting machine energy storage device, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0009] This invention aims to address the shortcomings of existing technologies by providing an intelligent energy storage control method and system for die casting machines. This system can assist operators in setting the target nitrogen pressure for energy storage, thereby improving operability and work efficiency.

[0010] To achieve the above objectives, the present invention employs the following measures:

[0011] A method for intelligent energy storage control of a die-casting machine, the method comprising:

[0012] Step 1: Energy storage self-test: The energy storage drain valve is de-energized and discharges hydraulic oil. When the energy storage airbag reaches the relaxed state, the locked nitrogen pressure value P0 is obtained. It is determined whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm is triggered. If it is within the first preset nitrogen pressure range, proceed to Step 2.

[0013] Step 2: Determine the target nitrogen pressure value for energy storage: Select the energy storage mode, obtain the target nitrogen pressure value P2, and control the energy storage device to start energy storage based on the obtained target nitrogen pressure value P2.

[0014] Step 3, Energy Storage Judgment: Obtain the real-time nitrogen pressure value P4 of the energy storage action described in Step 2, determine the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2 of the energy storage, and obtain the judgment result;

[0015] Step 4: Energy storage control: Control the energy storage state of the energy storage device based on the judgment results of Step 3.

[0016] As described above, in step two, the energy storage mode includes a first mode and a second mode. The first mode is an intelligent computing mode, and the second mode is a manual input mode.

[0017] As described above, when the first mode is selected, the calculation unit will calculate the target nitrogen pressure value P2 of the energy storage based on the locked nitrogen pressure value P0.

[0018] In step four of the method described above, during the energy storage control, energy storage is completed when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is equal to the target nitrogen pressure value P2, and the duration for which the real-time nitrogen pressure value P4 is equal to the target nitrogen pressure value P2 exceeds a set duration.

[0019] In step four of the method described above, during the energy storage control, energy storage is completed when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is greater than the target nitrogen pressure value P2 plus the set energy storage bias value.

[0020] In step four of the method described above, during the energy storage control, if the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value, and the duration for which the real-time nitrogen pressure value P4 is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value exceeds the set duration, and the motor speed is less than the set speed, then the energy storage is abnormal and an alarm is triggered, and energy storage stops.

[0021] In step four of the method described above, during the energy storage control, if the energy storage time exceeds the set maximum energy storage time, an energy storage anomaly is detected and an alarm is triggered, and energy storage is stopped.

[0022] As described above, after energy storage is completed, the detection unit performs a second detection on the real-time nitrogen pressure value P4 before the injection operation. If the detected real-time nitrogen pressure value P4 is greater than the energy storage target nitrogen pressure value P2 minus the set lower bias pressure value, the control unit controls the injection component to perform the injection operation; otherwise, an alarm is triggered.

[0023] A smart energy storage control system for a die-casting machine, comprising:

[0024] Energy storage self-test module: used to discharge hydraulic oil when the energy storage drain valve loses power and when the energy storage airbag reaches the relaxed state, to obtain the locked nitrogen pressure value P0, and to determine whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm prompt will be issued.

[0025] Energy storage target nitrogen pressure value determination module: After the energy storage self-test module completes the energy storage self-test, it selects the energy storage mode, obtains the energy storage target nitrogen pressure value P2 according to the energy storage mode, and controls the energy storage device to start the energy storage action according to the obtained energy storage target nitrogen pressure value P2.

[0026] Energy storage judgment module: used to judge the relationship between the real-time nitrogen pressure value P4 and the energy storage target nitrogen pressure value P2 during the energy storage process after the energy storage target nitrogen pressure value determination module determines the energy storage target nitrogen pressure value P2, and obtain the judgment result;

[0027] Energy storage control module: used to control the energy storage state of the energy storage device based on the judgment result of the energy storage pressure judgment module.

[0028] Compared with existing technical solutions, the main beneficial effects of the technical solution of this invention are as follows:

[0029] This invention locks the nitrogen pressure P0 through energy storage self-testing, and then determines whether the locked nitrogen pressure P0 is within a first preset nitrogen pressure range. If the locked nitrogen pressure P0 is within the first preset nitrogen pressure range, the target nitrogen pressure value P2 is obtained by determining different modes of the energy storage target value. If the locked nitrogen pressure P0 is not within the first preset nitrogen pressure range, an alarm prompts the staff to release or fill nitrogen to bring the locked nitrogen pressure P0 back into the first preset nitrogen pressure range. Then, the target nitrogen pressure value P2 is obtained by determining different modes of the energy storage target value. This can assist the staff in setting the target nitrogen pressure of energy storage, improve operability, and increase work efficiency.

[0030] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description

[0031] Figure 1 This is a flowchart of the intelligent energy storage control method for die-casting machines according to the present invention.

[0032] Figure 2 This is a flowchart of the energy storage self-test of the intelligent energy storage control method for die-casting machines of the present invention.

[0033] Figure 3 This is a flowchart illustrating the determination of the energy storage target value in the intelligent energy storage control method for die-casting machines according to the present invention.

[0034] Figure 4 This is a flowchart of the intelligent energy storage control method for the die-casting machine according to the present invention.

[0035] Figure 5 This is a structural block diagram of the intelligent energy storage control system for die-casting machines of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] This invention provides an intelligent energy storage control method and system for die-casting machines, which solves the problem of cumbersome operation caused by frequent operation when workers rely on their work experience to perform energy storage in related technologies.

[0039] As attached Figure 1 As shown, according to one aspect of the present invention, a smart energy storage control method for a die-casting machine, the method comprising:

[0040] Step 1: Energy storage self-test: The energy storage drain valve is de-energized and discharges hydraulic oil. When the energy storage airbag reaches the relaxed state, the locked nitrogen pressure value P0 is obtained. It is determined whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm is triggered. If it is within the first preset nitrogen pressure range, proceed to Step 2.

[0041] Step 2: Determine the target nitrogen pressure value for energy storage: Select the energy storage mode, obtain the target nitrogen pressure value P2, and control the energy storage device to start energy storage based on the obtained target nitrogen pressure value P2.

[0042] Step 3, Energy Storage Judgment: Obtain the real-time nitrogen pressure value P4 of the energy storage action described in Step 2, determine the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2 of the energy storage, and obtain the judgment result;

[0043] Step 4: Energy storage control: Control the energy storage state of the energy storage device based on the judgment results of Step 3.

[0044] This embodiment provides an intelligent energy storage control method for a die-casting machine, with appendix... Figure 1 This is a flowchart of an intelligent energy storage control method for a die-casting machine according to an embodiment of the present invention, with appended... Figure 2 Appendix Figure 3 and attached Figure 4 The diagram shows the specific steps of each process in this control method.

[0045] The energy accumulator contains an air bladder to store nitrogen gas. Hydraulic oil is stored inside the accumulator, outside the air bladder. When the amount of nitrogen is constant, hydraulic oil is gradually injected into the accumulator. The air bladder storing nitrogen is gradually compressed and deformed by the hydraulic oil, increasing the nitrogen pressure. Conversely, during injection, the accumulator discharges oil, causing the air bladder to gradually relax, decreasing the nitrogen pressure. The target nitrogen pressure value P2 is the set pressure reached by the nitrogen inside the air bladder when the accumulator stores energy, i.e., during the process of injecting hydraulic oil into the accumulator, as the hydraulic oil gradually compresses the air bladder.

[0046] Specifically, when the accumulator's drain valve loses power, hydraulic oil is discharged. When all the hydraulic oil in the accumulator is discharged and the air bladder in the accumulator reaches a fully relaxed state, the detection unit detects the nitrogen pressure value in the accumulator and locks this nitrogen pressure value, setting it as the locked nitrogen pressure value P0. The locked nitrogen pressure value P0 is compared with a first preset nitrogen pressure range. If the locked nitrogen pressure value P0 falls within the first preset nitrogen pressure range, the operation of determining the energy storage target value can be performed. If the locked nitrogen pressure value P0 does not fall within the first preset nitrogen pressure range, an alarm message will be issued through the alarm unit to provide an alarm prompt. The lower limit of the first preset nitrogen pressure range is the minimum working pressure, which refers to the minimum nitrogen pressure required for the energy storage device to fully store energy. This minimum working pressure ensures that the energy storage device can be filled with enough nitrogen to meet the system's nitrogen pressure requirements when needed. Below the minimum working pressure, the energy storage device cannot provide sufficient nitrogen pressure and power, and therefore cannot perform normal energy storage operations. The upper limit of the first preset nitrogen pressure range is the maximum working pressure, which refers to the maximum nitrogen working pressure that the energy storage device can safely withstand. Exceeding the maximum working pressure may damage or rupture the energy storage device, leading to safety hazards. The alarm information can be displayed on a terminal, such as an HMI interface displaying the current nitrogen pressure value and indicating the first preset nitrogen pressure range, prompting the operator to fill or release nitrogen to bring the nitrogen pressure in the energy storage device within the first preset nitrogen pressure range. The alarm information can also be indicated by different flashing states of the alarm light or by the alarm light illuminating when an abnormality occurs. The alarm information can also be indicated by a buzzer. Of course, the alarm information can be triggered by a combination of the above three alarm methods, which further facilitates the operator's operation.

[0047] When the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range, or when the staff fills or releases nitrogen after an alarm prompt to ensure that the nitrogen is within the first preset nitrogen pressure range, the step of determining the energy storage target nitrogen pressure value P2 is initiated.

[0048] Unlike existing methods that require manual setting of the target nitrogen pressure value P2 for energy storage, this invention provides two setting modes for determining the target nitrogen pressure value P2 to meet different energy storage needs. These two setting modes are intelligent mode and manual mode.

[0049] Specifically, as shown in the attached document Figure 3 As shown, on the one hand, if the operator does not need the energy storage device to perform the predetermined energy storage operation, the operator can select the intelligent mode, that is, select the intelligent energy storage function in the terminal. In intelligent mode, the operator does not need to set the target nitrogen pressure value P2; the program in the control unit will control the calculation unit to calculate the target nitrogen pressure value P2 based on the locked nitrogen pressure value P0. Specifically, in intelligent mode, the target nitrogen pressure value P2 is calculated based on the ideal gas hydraulic formula P... 预 *V 预 n =P max *V max n =P min *V min n The calculation yielded, where P 预 Pre-charge nitrogen pressure; P min Minimum operating pressure; P max For maximum working pressure; V 预 The required accumulator volume for pre-charging nitrogen; V min To achieve the minimum working pressure P min Gas capacity at time; V max To operate at maximum pressure P max The gas capacity at that time; n is the heliotropic index. According to Boyle-Mariotte's law of state changes in ideal gases, the state changes during slow expansion and compression are close to isothermal, and the heliotropic index n can be 1; for rapid expansion and compression, when the gas pre-charged in the storage tank is diatomic nitrogen, n = 1.4. Therefore, the isothermal (n = 1) state can be calculated. Where, ΔV=V max -V min When things are changeable, That is, when it is variable (n = 1.4), It is important to note that the ΔV value varies depending on the model of the energy storage device. Since the energy storage process involves continuously injecting hydraulic oil into the energy storage device, and storing energy by continuously compressing nitrogen gas through the hydraulic oil, the coefficient in the hydraulic formula for calculating the target nitrogen pressure P2 is the rapid hydraulic pressure coefficient. That is, the rapid hydraulic pressure coefficient used to calculate the target nitrogen pressure P2 is the highest: Rapid hydraulic pressure maximum value coefficient M0 = V预 / V max Minimum: Minimum rapid oil pressure coefficient M1 = V 预 / V min That is, the maximum target nitrogen pressure value P2 for energy storage is P2max = P0 * M0, and the minimum target nitrogen pressure value P2 is P2min = P0 * M1. Therefore, the recommended range for the target nitrogen pressure value P2 is (P0 * M1, P0 * M0). Additionally, it should be noted that to ensure sufficient energy storage in the energy storage device, the target nitrogen pressure value P2 is calculated using the rapid oil pressure maximum value coefficient M0 during the control unit's programming. That is, when the intelligent mode is selected, the target nitrogen pressure value P2 calculated by the program control calculation unit in the control unit is the maximum target nitrogen pressure value P2max calculated based on the locked nitrogen pressure value P0 and the rapid oil pressure maximum value coefficient M0.

[0050] On the other hand, as attached Figure 3 As shown, if the operator needs the energy storage device to perform a predetermined energy storage operation, the operator can select manual mode, that is, input the target nitrogen pressure value P2 in the terminal. The target nitrogen pressure value P2 manually input in the terminal is calculated based on the above hydraulic formula and Boyle-Mariotte's law of state changes in an ideal gas. In summary, when the intelligent mode is selected, it is not necessary to set the target nitrogen pressure value P2; the control unit uses P2max calculated by the calculation unit as the set target nitrogen pressure value P2 for intelligent energy storage control. When the manual mode is selected, the target nitrogen pressure value P2 needs to be input in the terminal.

[0051] Once the target nitrogen pressure value P2 is determined manually or intelligently, and the nitrogen in the energy storage device is within the preset nitrogen range, the control unit will issue a control command to control the energy storage device to perform energy storage operations. During continuous energy storage, the detection unit will monitor the real-time nitrogen pressure value P4 in the energy storage device in real time. Then, the judgment unit will judge the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2. The judgment unit will transmit the judgment result to the control unit, which will issue different control commands to control the energy storage state of the energy storage device based on different judgment results. When the judgment unit judges that the energy storage device is storing energy normally, the control unit will issue a command to complete the energy storage and control the energy storage device to complete the energy storage and stop. When the judgment unit judges that the energy storage device is storing energy abnormally, the control unit will issue a command to control the energy storage device to stop storing energy and issue an alarm message through the alarm unit to provide an alarm prompt for abnormal energy storage during the energy storage process. The alarm information can be displayed on the terminal. The alarm can also be indicated by different flashing states of the alarm light or by the alarm light illuminating when an abnormality occurs. Furthermore, the alarm can be triggered by a buzzer. Of course, the alarm can be triggered by a combination of these three methods, which further enhances the ease of operation for staff.

[0052] In short, as attached Figure 4 As shown, in the energy storage control of the die-casting machine energy storage device of the present invention, the judgment unit compares the real-time nitrogen pressure value P4 with the target nitrogen pressure value P2, and performs the energy storage control in step four according to the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2.

[0053] Furthermore, as shown in the appendix Figure 4 As shown, in step four, in the energy storage control, when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is equal to the energy storage target nitrogen pressure value P2, and the duration for which the real-time nitrogen pressure value P4 is equal to the energy storage target nitrogen pressure value P2 exceeds a set duration, the energy storage is completed.

[0054] Specifically, in step four, during the energy storage control, when the judgment unit determines the relationship between the real-time nitrogen pressure value P4 detected by the detection unit and the target nitrogen pressure value P2, if the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2 are equal in magnitude, and the duration for which the real-time nitrogen pressure value P4 equals the target nitrogen pressure value P2 exceeds the set duration of 2 seconds required by the die-casting process, then the judgment unit will determine that energy storage is complete, and the control unit will control the energy storage device to stop energy storage according to the energy storage completion command. It should be noted that the set duration of 2 seconds is set according to the die-casting process; if the requirements for the die-cast product are high, the set duration will be longer.

[0055] Furthermore, as shown in the appendix Figure 4 As shown, in step four, in the energy storage control, when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is greater than the energy storage target nitrogen pressure value P2 plus the set energy storage bias value, the energy storage is completed.

[0056] Specifically, in step four, during the energy storage control, when the judgment unit determines the relationship between the real-time nitrogen pressure value P4 detected by the detection unit and the target nitrogen pressure value P2, if the real-time nitrogen pressure value P4 is greater than the target nitrogen pressure value P2 plus the set energy storage bias value of 2 bar, the judgment unit will determine that energy storage is complete, and the control unit will control the energy storage device to stop energy storage according to the energy storage completion command. The set energy storage bias value of 2 bar is for overcharging, that is, storing a little more energy after the energy storage device has stored energy to the target nitrogen pressure value P2. This is because when the energy storage action ends, the energy storage device valve needs a certain amount of time to close, and some hydraulic oil will leak out from the oil valve, causing the real-time nitrogen pressure value P4 in the energy storage device to drop. The set energy storage bias value is used to compensate for the drop in the real-time nitrogen pressure value P4 caused by the oil leaking from the oil valve, so as to ensure sufficient energy. Additionally, it should be noted that the set upper bias voltage value for energy storage is determined based on the die-casting process. If the requirements for die-cast products are relatively high, the upper bias voltage value will be set higher.

[0057] Furthermore, as shown in the appendix Figure 4 As shown, in step four, in the energy storage control, when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value, and the duration for which the real-time nitrogen pressure value P4 is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value exceeds the set duration, and the motor speed is less than the set speed, the energy storage is abnormal and an alarm is triggered, and the energy storage stops.

[0058] Specifically, in step four, during the energy storage control, when the ambient temperature rises, the temperature of the hydraulic oil in the energy storage device also rises, and the temperature of the nitrogen gas in the energy storage device also rises accordingly. The real-time nitrogen gas pressure value P4 detected by the detection unit will also increase. Therefore, in the energy storage control, the polytropic index n will change from 1 to 1.4 according to the change in ambient temperature to calibrate the target nitrogen gas pressure value P2. That is, the target nitrogen gas pressure value P2 will increase as the ambient temperature rises. Accordingly, the energy storage control step performs judgment and control based on the following judgment conditions: if the judgment unit determines the relationship between the real-time nitrogen pressure value P4 detected by the detection unit and the target nitrogen pressure value P2, and the real-time nitrogen pressure value P4 is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value of 5 bar, and the duration for which the real-time nitrogen pressure value P4 is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value of 5 bar exceeds the set duration of 2 seconds, and the motor speed is less than the set speed of 750 rpm, then energy storage is abnormal and an alarm is triggered, and energy storage stops. During normal energy storage, the energy accumulator operates at high pressure and high flow rate, and the motor speed remains high at 1000-2000 rpm. Hydraulic oil continuously fills the accumulator. However, if the judgment condition indicates 750 rpm is a low motor speed, it means the system load is high, the accumulator has reached its maximum capacity, and hydraulic oil can no longer be added. In this case, the target nitrogen pressure P2 needs to be adjusted, or some nitrogen needs to be added. Motor speed is obtained through feedback from the driver. Specifically, the driver connects to the encoder on the motor and calculates the motor speed by reading the encoder's pulse signals. The driver then outputs the acquired speed information to the control unit via digital or analog signals for further control and monitoring of the energy accumulator. Alternatively, motor speed information can be directly measured using sensors such as photoelectric sensors and Hall effect sensors. These sensors can detect the rotational motion on the motor shaft and output the motor speed signal to the control unit. Finally, the motor speed can also be indirectly calculated by measuring the motor's power supply frequency. Additionally, it should be noted that the set energy storage under bias value is determined based on the die-casting process. If the requirements for die-cast products are relatively high, the under bias value will be set lower. The speed of 750 rpm is also determined based on the die-casting process. Depending on the die-cast product, the speed setting in the control program will be different.

[0059] Finally, the energy storage process will not continue indefinitely. If the energy storage device remains in the energy storage state without completing energy storage or being stopped due to an energy storage anomaly, a separate stop command will be set to stop the energy storage process.

[0060] Furthermore, as shown in the appendix Figure 4As shown, in the energy storage control, when the energy storage time exceeds the set maximum energy storage time, an energy storage abnormality is detected and an alarm is triggered, and energy storage stops.

[0061] Specifically, when the energy storage device is not in a continuous energy storage state due to energy storage completion or preset nitrogen abnormality, the judgment unit will determine whether the energy storage time of the energy storage device has reached the maximum energy storage time set in the control program. If the judgment unit determines that the energy storage time has reached the set maximum energy storage time, the control unit will control the energy storage device to stop energy storage by issuing a command to stop the energy storage device.

[0062] Furthermore, as shown in the appendix Figure 4 As shown, after energy storage is completed, the detection unit performs a second detection on the real-time nitrogen pressure value P4 before the injection operation. If the detected real-time nitrogen pressure value P4 is greater than the energy storage target nitrogen pressure value P2 minus the set lower bias pressure value, the control unit controls the injection component to perform the injection operation; otherwise, an alarm is triggered.

[0063] Specifically, after the die-casting machine's accumulator completes normal energy storage and stops, injection will not begin immediately. The accumulator valve needs time to close, and some hydraulic oil will leak out, causing a drop in accumulator pressure. Therefore, after energy storage is complete, before injection, the detection unit will perform a second detection on the real-time nitrogen pressure value P4. The judgment unit compares the second detected real-time nitrogen pressure value P4 with the target nitrogen pressure value P2. If the second detected real-time nitrogen pressure value P4 is greater than the target nitrogen pressure value P2 minus a set lower bias pressure of 5 bar, the control unit controls the injection component to perform injection. If the second detected real-time nitrogen pressure value P4 is less than or equal to the target nitrogen pressure value P2 minus the set lower bias pressure of 5 bar, an alarm will be issued by the alarm unit. It should be noted that the set lower bias pressure value is determined according to the die casting process. If the requirements for the die casting product are relatively high, the lower bias pressure value will be set lower. In addition, the set lower bias pressure value needs to be greater than the set upper bias pressure value to ensure sufficient energy for the injection operation.

[0064] As can be seen from the above embodiments, as long as the energy storage device performs a self-test, and the self-test result shows that the locked nitrogen pressure P0 is within the first preset nitrogen pressure range, or the operator charges or releases nitrogen according to the alarm prompt to reach the first preset nitrogen pressure range, the target nitrogen pressure value P2 is obtained. The control unit performs energy storage operation based on the obtained target nitrogen pressure value P2. During the energy storage process, the real-time nitrogen pressure value P4 is detected to determine whether the real-time nitrogen pressure value P4 meets predetermined conditions. If the predetermined conditions for energy storage completion are met, energy storage is completed and stopped; if the predetermined conditions for energy storage completion are not met, energy storage is stopped. All the above embodiments involve the above three steps; as long as these steps are present, the problem can be solved.

[0065] Corresponding to the above appendix Figure 1 This embodiment also provides an intelligent energy storage control system for a die-casting machine, with attachments. Figure 5 This is a structural block diagram of the intelligent energy storage control system for a die-casting machine according to an embodiment of the present invention, as shown in the attached diagram. Figure 5 As shown, the system includes:

[0066] Energy storage self-test module: used to discharge hydraulic oil when the energy storage drain valve loses power and when the energy storage airbag reaches the relaxed state, to obtain the locked nitrogen pressure value P0, and to determine whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm prompt will be issued.

[0067] Energy storage target nitrogen pressure value determination module: After the energy storage self-test module completes the energy storage self-test, it selects the energy storage mode, obtains the energy storage target nitrogen pressure value P2 according to the energy storage mode, and controls the energy storage device to start the energy storage action according to the obtained energy storage target nitrogen pressure value P2.

[0068] Energy storage judgment module: used to judge the relationship between the real-time nitrogen pressure value P4 and the energy storage target nitrogen pressure value P2 during the energy storage process after the energy storage target nitrogen pressure value determination module determines the energy storage target nitrogen pressure value P2, and obtain the judgment result;

[0069] Energy storage control module: used to control the energy storage state of the energy storage device based on the judgment result of the energy storage pressure judgment module.

[0070] In the aforementioned intelligent energy storage control system for die-casting machines, the energy storage self-test module is specifically used for:

[0071] When the hydraulic oil is discharged due to power failure of the accumulator's drain valve, and the accumulator's airbag reaches a relaxed state, the locking nitrogen pressure value P0 is detected and obtained through the detection module. It is then determined whether the obtained locking nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm message is issued through the alarm module to provide an alarm prompt. If it is within the first preset nitrogen pressure range, the energy storage self-test operation is stopped.

[0072] In the aforementioned intelligent energy storage control system for die-casting machines, the module for determining the target nitrogen pressure value for energy storage is specifically used for:

[0073] After the energy storage self-test module completes the energy storage self-test, the energy storage mode is selected in the terminal of the energy storage target nitrogen pressure value determination module. The energy storage target nitrogen pressure value P2 is obtained according to the selected energy storage mode, and the energy storage device is controlled to start the energy storage action according to the obtained energy storage target nitrogen pressure value P2.

[0074] In the aforementioned intelligent energy storage control system for die-casting machines, the energy storage judgment module is specifically used for:

[0075] During the energy storage process after the energy storage target nitrogen pressure value determination module determines the energy storage target nitrogen pressure value P2, the energy storage judgment module determines the relationship between the real-time nitrogen pressure value P4 and the energy storage target nitrogen pressure value P2, and obtains the judgment result.

[0076] In the aforementioned intelligent energy storage control system for die-casting machines, the energy storage control module is specifically used for:

[0077] Based on the judgment result of the energy storage pressure judgment module on the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2, the energy storage state of the energy storage device is controlled.

[0078] With the above system, staff can set the preset nitrogen pressure or the target nitrogen pressure for energy storage without complicated operations, thereby realizing the intelligent energy storage control of the die-casting machine.

[0079] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A method for intelligent energy storage control of a die-casting machine, characterized in that, The method includes: Step 1: Energy storage self-test: The energy storage drain valve is de-energized and discharges hydraulic oil. When the energy storage airbag reaches the relaxed state, the locked nitrogen pressure value P0 is obtained. It is determined whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm is triggered. If it is within the first preset nitrogen pressure range, proceed to Step 2. Step 2: Determine the target nitrogen pressure value for energy storage: Select the energy storage mode, obtain the target nitrogen pressure value P2, and control the energy storage device to start energy storage based on the obtained target nitrogen pressure value P2. Step 3, Energy Storage Judgment: Obtain the real-time nitrogen pressure value P4 of the energy storage action in Step 2, determine the relationship between the real-time nitrogen pressure value P4 and the target nitrogen pressure value P2, and obtain the judgment result; Step 4: Energy Storage Control: Control the energy storage state of the energy storage device based on the judgment results of Step 3; In step four, in the energy storage control, when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is equal to the energy storage target nitrogen pressure value P2, and the duration for which the real-time nitrogen pressure value P4 is equal to the energy storage target nitrogen pressure value P2 exceeds a set duration, the energy storage is completed. In step four, during the energy storage control, when the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is greater than the target nitrogen pressure value P2 plus the set energy storage bias value, the energy storage is completed. In step four, during the energy storage control, if the judgment result is that the real-time nitrogen pressure value P4 detected by the detection unit is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value, and the duration for which the real-time nitrogen pressure value P4 is less than the target nitrogen pressure value P2 minus the set energy storage lower bias value exceeds the set duration, and the motor speed is less than the set speed, then the energy storage is abnormal and an alarm is triggered, and energy storage stops. In step four, during the energy storage control, if the energy storage time exceeds the set maximum energy storage time, an energy storage anomaly is detected and an alarm is triggered, and energy storage stops.

2. The intelligent energy storage control method for a die-casting machine according to claim 1, characterized in that: In step two, the energy storage mode includes a first mode and a second mode. The first mode is an intelligent computing mode, and the second mode is a manual input mode.

3. The intelligent energy storage control method for a die-casting machine according to claim 2, characterized in that: When the first mode is selected, the calculation unit will calculate the target nitrogen pressure value P2 of the energy storage based on the locked nitrogen pressure value P0.

4. The intelligent energy storage control method for a die-casting machine according to claim 1, characterized in that: After energy storage is completed, the detection unit performs a second detection on the real-time nitrogen pressure value P4 before the injection operation. If the detected real-time nitrogen pressure value P4 is greater than the energy storage target nitrogen pressure value P2 minus the set lower bias pressure value, the control unit controls the injection component to perform the injection operation; otherwise, an alarm is triggered.

5. An intelligent energy storage control system for a die-casting machine, employing the intelligent energy storage control method for a die-casting machine as described in claim 1, characterized in that, include: Energy storage self-test module: used to discharge hydraulic oil when the energy storage drain valve loses power and when the energy storage airbag reaches the relaxed state, to obtain the locked nitrogen pressure value P0, and to determine whether the locked nitrogen pressure value P0 is within the first preset nitrogen pressure range. If it is not within the first preset nitrogen pressure range, an alarm prompt will be issued. Energy storage target nitrogen pressure value determination module: After the energy storage self-test module completes the energy storage self-test, it selects the energy storage mode, obtains the energy storage target nitrogen pressure value P2 according to the energy storage mode, and controls the energy storage device to start the energy storage action according to the obtained energy storage target nitrogen pressure value P2. Energy storage judgment module: used to judge the relationship between the real-time nitrogen pressure value P4 and the energy storage target nitrogen pressure value P2 during the energy storage process after the energy storage target nitrogen pressure value determination module determines the energy storage target nitrogen pressure value P2, and obtain the judgment result; Energy storage control module: used to control the energy storage state of the energy storage device based on the judgment result of the energy storage judgment module.

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