Automatic ejection control method for injection molding machine

Abstract

The application discloses an automatic stripper control method for an injection molding machine, wherein only two operations of pressing an automatic stripper button and pressing an automatic plunger button can automatically complete the stripper action and the plunger action, the operation is simple and easy to realize, an operator only needs to stand in front of an operation platform when the stripper action and the plunger action are needed, the operation time of the operator is greatly reduced, the operation difficulty of the operator is reduced, the die changing efficiency is improved, different detection signals can be obtained through a plurality of sensors, the stripper state and the plunger state can be judged in real time, the connection of various actions is ensured, the safety state of the stripper process is monitored in real time, good safety and stability are achieved, the setting of the delay time between actions can realize automation and has a time buffer, and sudden faults are avoided to cause serious mechanical damage.

Description

Technical Field

[0001] This invention relates to an automatic extraction control method for injection molding machines. Background Technology

[0002] In the production of two-platen injection molding machines, different products require different molds for injection molding. Mold changing typically involves a crane overhead, with a chain attached to the top of the machine and a mold lifting ring attached to the other end of the chain. The crane slowly rises vertically to straighten the chain, and tools are used to remove the bolts, slowly unlocking the mold platen and lifting it off the machine. Mold loading typically involves a crane using a chain to lift the mold ring, slowly lowering the mold from above the machine to the bolt holes, while simultaneously slowly closing and locking the mold, and then tightening the bolts to secure it. However, in two-platen injection molding machines with high clamping forces, the large machine size results in large mold volumes. Issues such as insufficient height in production workshops / factories or low crane installation positions prevent the use of mold changing above the injection molding machine, making it unsuitable for production workshops with limited space.

[0003] Furthermore, for customers who frequently produce different products and need to change molds often, a mold-drawing device is commonly used. This allows for side mold loading during mold changes, overcoming the limitation of not being able to change molds above the injection molding machine. However, traditional mold-drawing operations generally require manual division of each action, demanding a certain level of operator skill and potentially leading to human error that could affect the process. Moreover, operators need to constantly monitor the control screen, impacting production efficiency. Additionally, the mold-feeding and mold-drawing processes require controlling the movements of different components. If these movements are not properly coordinated, it can waste unnecessary time and even affect the completion of the mold-drawing or mold-feeding actions, posing safety hazards. Summary of the Invention

[0004] This invention overcomes the shortcomings of the above-mentioned technologies and provides an automatic extraction control method for injection molding machines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic ejection control method for an injection molding machine includes the following steps:

[0007] S1. When the injection molding machine is in an operational state, perform preliminary adjustments to put the injection molding machine into a production or extraction state. The preliminary adjustments include at least the following: adjusting the hydraulic clamps that can clamp / release the extraction object.

[0008] S2. When it is necessary to pull out the mold and change the mold, press the automatic pulling out button on the control panel. The hydraulic clamp will release. When the hydraulic clamp meets the condition of being released in place and the preset delay time is reached after being released in place, the automatic pulling out action will be performed.

[0009] S3. When the injection molding machine meets the requirements of the mold pulling completion state, it proves that the mold pulling action is completed. At this time, the pulling object and the mold pull column are pulled out together to the mold pulling position, and the mold changing action can be performed from the side of the injection molding machine.

[0010] S4. After the mold change is completed, press the automatic mold advance button on the control panel to perform the automatic mold advance action. When the injection molding machine meets the mold advance position, it means that the object being pulled and the gate column have been pulled back to the mold advance position together.

[0011] S5. Under the condition that the clamping device is in place and the delay time has been reached, the hydraulic clamping device starts the clamping action; if it is detected that the hydraulic clamping device is in place and the delay time after clamping is reached, the clamping action stops, and the clamping is completed.

[0012] S6. The injection molding machine returns to the production or extraction state.

[0013] In a preferred embodiment, the following steps are included after step S6:

[0014] S7. During the process of the hydraulic clamp maintaining the clamping state, check whether the decrease in clamping pressure of the hydraulic clamp exceeds the preset decrease value. If it exceeds, it proves that the pressure is too low and the clamping action needs to be started automatically until the pressure reaches the preset clamping pressure value again. If it does not exceed, no action is required.

[0015] In a preferred embodiment, the operable state in step S1 is as follows: the first sensor for detecting the clamping / releasing of the hydraulic clamp is debugged and installed in place; the second sensor for detecting the withdrawing / advancing position of the object being pulled out is debugged and installed in place; the pressure sensor installed in the hydraulic circuit controlling the clamping / releasing for detecting the hydraulic pressure during clamping is debugged and installed in place; and the sensing element installed on the object being pulled out to cooperate with the second sensor is installed in place. The injection molding machine detects the left clamping position signal, right clamping position signal, left release position signal, and right release position signal of the object being pulled out through the first sensor; the injection molding machine detects the advancing and withdrawing position signals of the object being pulled out through the second sensor; and the injection molding machine detects the clamping pressure value through the pressure sensor.

[0016] As a preferred embodiment, the production or extraction state is as follows: there is a signal for the insertion position, there is no signal for the left and right sides of the hydraulic clamp to be released, there are signals for the left and right sides of the hydraulic clamp to be clamped, the clamping pressure meets the preset clamping pressure value, and the preset delay time is met under the conditions of clamping position and clamping pressure detection.

[0017] In a preferred embodiment, step S2, when mold changing is required, involves pressing the automatic mold-changing button on the control panel, causing the hydraulic clamp to release. The automatic mold-changing action is performed when the hydraulic clamp is fully released and a preset delay time has elapsed after the release. This includes:

[0018] Pressing the automatic release button on the control panel energizes the release valve, controlling the solenoid valve in the hydraulic circuit responsible for releasing the hydraulic clamp, thus initiating the release action. At this time, the clamping pressure begins to release. When the hydraulic clamp meets the conditions of being fully released (i.e., the clamping pressure is completely released and a preset delay time is reached after being fully released), the release valve is energized, controlling the solenoid valve in the hydraulic circuit responsible for pulling out the object, thus initiating the automatic release action. The conditions for meeting the conditions of being fully released are: the pressure sensor detects a value of 0 bar, both the left and right clamping positions of the hydraulic clamp lose their signals, and both the left and right release positions of the hydraulic clamp receive their signals.

[0019] As a preferred embodiment, the conditions for the injection molding machine to meet the extraction completion state in step S3 are: the insertion position signal is lost, the extraction position signal is received, the solenoid valve responsible for releasing the hydraulic clamp in the oil circuit is de-energized, and the solenoid valve responsible for extracting the object in the oil circuit is de-energized; the clamping position state in step S5 is: both the left and right release positions of the hydraulic clamp are lost, both the left and right clamping positions of the hydraulic clamp are received, and the clamping pressure meets the preset clamping pressure value.

[0020] In one preferred embodiment, after pressing the automatic feed button on the control panel, an energizing signal is output to the feed valve, which energizes the solenoid valve in the oil circuit responsible for retracting the object, thereby performing the automatic feed action; the conditions for the injection molding machine to meet the feed position state are: there is a feed position signal, there is no retraction position signal, and the solenoid valve in the oil circuit responsible for retracting the object is de-energized.

[0021] In a preferred embodiment, after step S6, the following step is further included:

[0022] The pumping action was simulated and debugged multiple times using simulation control software for a simulated injection molding machine to ensure the feasibility of the automatic control method.

[0023] As a preferred embodiment, the steps prior to step S1 include: presetting the pressure and flow rate of the automatic suction pump, presetting the pressure and flow rate of the automatic suction pump, and presetting the pressure and flow rate of the automatic clamping pump.

[0024] In a preferred embodiment, when pressing the auto-discharge button on the control panel in step S2, the following steps are also included:

[0025] Another energizing signal is output to release the valve, which in turn energizes the pressure-holding solenoid valve connected in series in the clamping oil circuit.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The automatic control method in this case only requires pressing the automatic mold withdrawal button and the automatic mold advance button to automatically complete the mold withdrawal and advance actions. It is simple and easy to implement. Operators only need to stand in front of the operating platform when mold withdrawal or advance is required, greatly reducing operator time and difficulty, while improving mold change efficiency. It can obtain different detection signals from several sensors, enabling real-time judgment of the mold withdrawal and advance status, ensuring the smooth transition of each action and real-time monitoring of the safety status of the mold withdrawal process, exhibiting good safety and stability. The set delay time between actions provides a buffer while achieving automation, avoiding serious mechanical damage caused by sudden malfunctions. Thus, this control method can automatically realize mold change actions on the side of the injection molding machine, making it applicable in production plants with limited height. Through automated control, it achieves efficient and stable mold withdrawal and advance, facilitating widespread application.

[0028] 2. This case utilizes simulation control software for a simulated injection molding machine to conduct multiple simulations and adjustments of the pumping action, ensuring the feasibility of the automatic control method. This improves the reliability of the automatic control method and eliminates the need for multiple actual adjustments, reducing resource waste caused by debugging.

[0029] 3. The setting of step S7 in Example 2 can play the role of pressure compensation, solve the problem that the hydraulic clamp may not be firmly clamped when maintaining the clamping state for a long time, and ensure safe use. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating Embodiment 1 of this case;

[0031] Figure 2 This is a flowchart of Example 2 of this case. Detailed Implementation

[0032] The following examples further illustrate the features and other related characteristics of the present invention in detail, to facilitate understanding by those skilled in the art:

[0033] In this invention, "pulling out" refers to the removal and insertion of the gatepost. The injection molding machine itself has already determined the object to be pulled out and set the entry and exit positions. The high-pressure cylinder above the safety door on the side of the two-platen injection molding machine without a control screen can be used as the object to be pulled in, and this high-pressure cylinder is connected to the gatepost. When the gatepost is installed in place, it is in close contact with the fixed plate installed on the column frame; this is the entry position. The exit position is the distance at which the entire high-pressure cylinder is pulled out without obstructing the mold from the side.

[0034] Example 1

[0035] like Figure 1 As shown, an automatic injection molding machine extraction control method includes the following steps:

[0036] S1. When the injection molding machine is in an operational state, perform preliminary adjustments to bring it into a production or extraction state. This preliminary adjustment includes at least: adjusting the hydraulic clamping device capable of clamping / releasing the extraction object; specifically, adjusting the hydraulic clamping device from an open state to an automatic clamping state, meaning the hydraulic clamping device can automatically clamp. This facilitates the initial adjustment of the hydraulic clamping device, and after adjustment, the hydraulic clamping device will automatically delay until it detects the arrival of preset pressure and flow rate before outputting to the clamping valve to initiate the clamping action.

[0037] The production or extraction ready state is defined as follows: there is a signal indicating the insertion position is reached; there are no signals indicating the left or right side of the hydraulic clamp is fully released; there are signals indicating the left or right side of the hydraulic clamp is fully clamped; the clamping pressure meets the preset clamping pressure value; and a preset delay time is met under the conditions of clamping in place and clamping pressure detection. In specific implementation, the hydraulic clamp automatically clamps after transitioning from an unadjusted release state to a properly adjusted state. After meeting the conditions of clamping in place and clamping pressure detection, the action stops after a 3-second delay, placing the injection molding machine in the production or extraction ready state. This ensures the clamping action is completed and the extraction object is clamped.

[0038] S2. When it is necessary to pull out the mold and change the mold, press the automatic pulling out button on the control panel. The hydraulic clamp will release. When the hydraulic clamp meets the condition of being released in place and the preset delay time is reached after being released in place, the automatic pulling out action will be performed (that is, after the clamping pressure of the hydraulic clamp is released, a certain delay time is delayed before the automatic pulling out action is performed).

[0039] In a preferred embodiment, step S2, when mold changing is required, involves pressing the automatic mold-changing button on the control panel, causing the hydraulic clamp to release. The automatic mold-changing action is performed when the hydraulic clamp is fully released and a preset delay time has elapsed after the release. This includes:

[0040] Pressing the automatic release button on the control panel energizes the release valve, controlling the solenoid valve in the hydraulic circuit responsible for releasing the hydraulic clamp, thus initiating the release action. At this time, the clamping pressure begins to release. Once the hydraulic clamp reaches the fully released state (i.e., the clamping pressure has completely released and a preset delay time has elapsed after release), the release valve is energized again, controlling the solenoid valve in the hydraulic circuit responsible for pulling out the object, thus initiating the automatic release action. The conditions for the hydraulic clamp to reach the fully released state are: the pressure sensor reading is 0 bar; both the left and right clamping positions of the hydraulic clamp lose their signals; and both the left and right release positions of the hydraulic clamp receive their signals. The above delay time can be flexibly adjusted according to actual needs.

[0041] This allows for the energization and de-energization of different solenoid valves through different control signals, thereby achieving different control functions. The control is simple and the division of labor is clear, improving control efficiency. By setting both the condition for the released state and the delay time, it can automatically determine whether the object being pulled has been released. The delay time setting allows for a buffer period, providing a time buffer between the release and pulling actions, preventing too frequent transitions between actions, avoiding serious mechanical damage due to sudden malfunctions, and providing a certain degree of protection.

[0042] S3. When the injection molding machine meets the requirements for the complete extraction state, it proves that the extraction action is complete. At this time, the object to be extracted and the guide column are pulled out together to the extraction position, and the mold changing action can be performed from the side of the injection molding machine. The conditions for the injection molding machine to meet the requirements for the complete extraction state are: the insertion position signal is lost, the extraction position signal is received, the solenoid valve in the hydraulic circuit responsible for releasing the hydraulic clamp is de-energized, and the solenoid valve in the hydraulic circuit responsible for extracting the object to be extracted is de-energized. This ensures the completion of the extraction action.

[0043] S4. After mold changing, press the automatic feed button on the control panel to output an energizing signal to the feed valve. This energizes the solenoid valve in the hydraulic circuit responsible for retracting the object, initiating the automatic feed action. When the injection molding machine meets the feed-in-place condition, it indicates that the object and the clamping column have been pulled back to the feed-in-place position together. The conditions for the injection molding machine to meet the feed-in-place condition are: a feed-in-place signal is present, a withdrawing-in-place signal is absent, and the solenoid valve in the hydraulic circuit responsible for retracting the object is de-energized. This ensures the feed-in is in place, serving as a prerequisite for the next clamping action, facilitating the connection between actions.

[0044] S5. Under the condition that the clamping device is in place and the delay time has been reached, the hydraulic clamping device starts the clamping action; if it is detected that the hydraulic clamping device is in place and the delay time after clamping is reached, the clamping action stops, and the clamping is completed.

[0045] As a preferred embodiment, step S5 specifically involves the following steps:

[0046] After the clamping mechanism reaches its final position, there is an automatic 3-second delay before the clamping valve is energized. This energizes the solenoid valve in the hydraulic circuit responsible for clamping, initiating the clamping action. The clamping process continues until both the left and right sides of the hydraulic clamping mechanism lose their release signals, while both sides receive signals indicating they are clamped in place. Simultaneously, the clamping pressure meets the preset value, at which point the machine is in the clamped-in state. After a 3-second automatic delay following the clamping in place, the clamping action stops, and the injection molding machine's clamping process is complete. This delay provides a buffer between the clamping and clamping actions, ensuring a smooth transition and preventing serious mechanical damage from sudden malfunctions. Furthermore, the energization of the solenoid valve allows for flexible control of the hydraulic clamping mechanism, simplifying operation. The system also allows for timely detection of the hydraulic clamping mechanism's status, enabling prompt adjustments to the next action, improving efficiency, reducing control costs, and preventing the clamping action from continuing even after the clamping is in place.

[0047] S6. The injection molding machine returns to the production or extraction state. This allows for continued production and preparation for the next extraction, achieving a cyclical operation and improving extraction efficiency.

[0048] In a preferred embodiment, the operable state in step S1 is as follows: the first sensor for detecting the clamping / releasing of the hydraulic clamp is debugged and installed in place; the second sensor for detecting the withdrawing / advancing position of the object being pulled in is debugged and installed in place; the pressure sensor installed in the hydraulic circuit controlling the clamping / releasing for detecting the hydraulic pressure during clamping is debugged and installed in place; and the sensing element installed on the object being pulled in cooperation with the second sensor is installed in place. Specifically, the injection molding machine detects the left-side clamping position signal, right-side clamping position signal, left-side release position signal, and right-side release position signal of the object being pulled in through the first sensor; the injection molding machine detects the advancing and withdrawing position signals of the object being pulled in through the second sensor; and the injection molding machine detects the clamping pressure value through the pressure sensor. In a specific implementation, the sensing element can be a small sheet metal piece. When the small sheet metal piece installed on the object reaches the withdrawing position, it is detected by the second sensor and receives the withdrawing position signal; similarly, the small sheet metal piece reaching the advancing position receives the advancing position signal. The first sensor consists of four sensors. Two sensors are responsible for sensing the piston of the left clamping part when it extends and retracts into place. The extension into place is the left clamping position signal set by the program control. Similarly, two additional sensors are responsible for sensing the piston of the right clamping part when it extends and retracts into place. The extension into place is the right clamping position signal set by the program control.

[0049] As mentioned above, the positions of each sensor and sensed element are pre-set in the operational state to facilitate rapid detection of the actions of different components during the extraction process, enabling accurate and rapid responses and improving the efficiency of the control method.

[0050] In a preferred embodiment of the present invention, after step S7 and before formal production, the following steps are also included:

[0051] The injection molding machine simulation control software is used to perform multiple simulations and debugging of the pumping action to ensure the feasibility of the automatic control method. In practice, the program is first written in KEBA programming software, and then multiple simulation experiments are conducted on the KEBA control simulation software to verify its feasibility and improve the reliability of the automatic control method. This eliminates the need for multiple actual debugging sessions, reducing resource waste caused by debugging. Furthermore, it allows for formal production use only after stable debugging, ensuring the accuracy of the control method. The KEBA programming software can be KEBA KeStudio software, and the KEBA control simulation software can be KEBA Simulation software.

[0052] As a preferred embodiment, the following steps are included before step S1: preset the pressure and flow rate of the automatic suction pump, preset the pressure and flow rate of the automatic suction pump, and preset the pressure and flow rate of the automatic clamping mechanism. This eliminates the need for operators to input additional parameters, avoiding risks arising from input errors. In practice, the pressure of the automatic suction pump and the pressure of the automatic suction pump can be the same or different, and the flow rates of the automatic suction pump and the automatic suction pump can also be the same or different. Setting the pressure of the automatic suction pump / automatic suction pump to 65 bar and the flow rate to 8% will allow for smooth and safe operation.

[0053] In a preferred embodiment, when pressing the auto-discharge button on the control panel in step S2, the following steps are also included:

[0054] Another energizing signal is output to the release valve, which energizes the pressure-holding solenoid valve connected in series in the clamping oil circuit. This ensures that the fluid in the oil circuit remains stable under a certain pressure, preventing leakage from the oil circuit after clamping.

[0055] Example 2

[0056] like Figure 2 As shown, the difference between Embodiment 2 and Embodiment 1 is that: after step S6, the following steps are also included:

[0057] S7. During the process of maintaining the clamping state, the system detects whether the drop in clamping pressure exceeds the preset drop value. If it does, it indicates excessive pressure relief, and the system automatically initiates clamping until the pressure reaches the preset clamping pressure value again. If the drop does not exceed the preset drop value, no action is required. For example, if the preset drop value is 20 bar, pressure relief may occur during a prolonged clamping period, causing the clamping pressure to drop. When the pressure sensor detects a drop exceeding 20 bar, the system will automatically initiate clamping until the pressure reaches the set value again; if the drop does not exceed 20 bar, no action is required. This provides pressure compensation, resolving the potential issue of insecure clamping during prolonged clamping and ensuring safe operation.

[0058] As described above, the automatic control method in this case only requires pressing the automatic mold withdrawal button and the automatic mold advance button to automatically complete the mold withdrawal and advance actions. It is simple to operate and easy to implement. Moreover, the operator only needs to stand in front of the operating platform when mold withdrawal and advance are required, greatly reducing operator time and difficulty, while improving mold change efficiency. It can obtain different detection signals through several sensors, enabling real-time judgment of the mold withdrawal and advance status, ensuring the connection of each action and real-time monitoring of the safety status of the mold withdrawal process, exhibiting good safety and stability. The set delay time between actions provides a time buffer while achieving automation, avoiding serious mechanical damage caused by sudden failures. Thus, this control method can automatically realize mold change actions on the side of the injection molding machine, can be applied in production plants with limited height, and achieves efficient and stable mold withdrawal and advance through automated control, which is conducive to widespread application. The control method described in this case can be applied to a two-platen injection molding machine with a clamping force of 3500T. In specific implementation, the control panel has an automatic ejection button. Automatic ejection will only occur when this option is selected and the conditions are met, preventing accidental activation by production personnel. The automatic ejection and automatic ejection buttons are specifically virtual buttons on the control panel, which can be pressed via touchscreen.

[0059] In specific implementation, the solenoid valves in the oil circuit that perform different functions are named as pull-out valve, inlet valve, release valve, and clamping valve. The pull-out valve is responsible for energizing the solenoid valve that controls the bidirectional solenoid valve in the oil circuit to pull out the high-pressure cylinder; the inlet valve is responsible for energizing the solenoid valve that controls the bidirectional solenoid valve in the oil circuit to pull back the high-pressure cylinder; the clamping valve is responsible for energizing the solenoid valve that controls the bidirectional solenoid valve in the oil circuit to clamp; and the release valve is responsible for energizing the solenoid valve that controls the pressure-holding solenoid valve and the release solenoid valve in the bidirectional solenoid valve in the oil circuit, so two energizing signals can be output. Among them, the pull-out valve and the inlet valve are the same directional valve, and the release valve and the clamping valve are the same directional valve (corresponding to different solenoid coils on the directional valve).

[0060] The above provides a detailed description of an automatic injection molding machine extraction control method disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An automatic ejection control method for an injection molding machine, characterized in that, Includes the following steps: S1. When the injection molding machine is in an operational state, perform preliminary adjustments to put the injection molding machine into a production or extraction state. The preliminary adjustments include at least the following: adjusting the hydraulic clamps that can clamp / release the extraction object. S2. When it is necessary to pull out the mold and change the mold, press the automatic pulling out button on the control panel. The hydraulic clamp will release. When the hydraulic clamp meets the condition of being released in place and the preset delay time is reached after being released in place, the automatic pulling out action will be performed. S3. When the injection molding machine meets the requirements of the mold pulling completion state, it proves that the mold pulling action is completed. At this time, the pulling object and the mold pull column are pulled out together to the mold pulling position, and the mold changing action can be performed from the side of the injection molding machine. S4. After the mold change is completed, after pressing the automatic ejection button on the control panel, the ejection valve is energized, which controls the solenoid valve in the hydraulic circuit responsible for retracting the ejected object, thereby performing the automatic ejection action. When the injection molding machine meets the ejection position, it means that the ejected object and the ejector column have been pulled back to the ejection position together. The conditions for the injection molding machine to meet the ejection position are: there is an ejection position signal, there is no ejection position signal, and the solenoid valve in the hydraulic circuit responsible for retracting the ejected object is de-energized. S5. Under the condition that the clamping device is in place and the delay time has been reached, the hydraulic clamping device starts the clamping action; if it is detected that the hydraulic clamping device is in place and the delay time after clamping is reached, the clamping action stops, and the clamping is completed. S6. The injection molding machine returns to the production or extraction state. In step S1, the operable state is as follows: the first sensor for detecting the clamping / releasing of the hydraulic clamp is debugged and installed in place; the second sensor for detecting the withdrawing / advancing position of the object being pulled in is debugged and installed in place; the pressure sensor installed in the hydraulic circuit controlling the clamping / releasing for detecting the hydraulic pressure during clamping is debugged and installed in place; and the sensing element installed on the object being pulled in cooperation with the second sensor is installed in place. The injection molding machine detects the left clamping position signal, right clamping position signal, left release position signal, and right release position signal of the object being pulled in through the first sensor; the injection molding machine detects the advancing position signal and withdrawing position signal of the object being pulled in through the second sensor; and the injection molding machine detects the clamping pressure value through the pressure sensor.

2. The automatic ejection control method for an injection molding machine according to claim 1, characterized in that, The following steps are included after step S6: S7. During the process of the hydraulic clamp maintaining the clamping state, check whether the decrease in clamping pressure of the hydraulic clamp exceeds the preset decrease value. If it exceeds, it proves that the pressure is too low and the clamping action needs to be started automatically until the pressure reaches the preset clamping pressure value again. If it does not exceed, no action is required.

3. The automatic ejection control method for an injection molding machine according to claim 1, characterized in that, The production or extraction state is as follows: there is a signal when the clamp is in place; there is no signal when the left and right sides of the hydraulic clamp are released; there are signals when the left and right sides of the hydraulic clamp are clamped; the clamping pressure meets the preset clamping pressure value; and the preset delay time is met under the conditions of clamping in place and clamping pressure detection in place.

4. An automatic ejection control method for an injection molding machine according to claim 1 or 2, characterized in that, Step S2 describes the automatic mold removal action when mold changing is required. Pressing the automatic mold removal button on the control panel causes the hydraulic clamp to release. The automatic mold removal action occurs when the hydraulic clamp is fully released and a preset delay time is reached after the release. This includes: Pressing the automatic release button on the control panel energizes the release valve, controlling the solenoid valve in the hydraulic circuit responsible for releasing the hydraulic clamp, thus initiating the release action. At this time, the clamping pressure begins to release. When the hydraulic clamp meets the conditions of being fully released (i.e., the clamping pressure is completely released and a preset delay time is reached after being fully released), the release valve is energized, controlling the solenoid valve in the hydraulic circuit responsible for pulling out the object, thus initiating the automatic release action. The conditions for meeting the conditions of being fully released are: the pressure sensor detects a value of 0 bar, both the left and right clamping positions of the hydraulic clamp lose their signals, and both the left and right release positions of the hydraulic clamp receive their signals.

5. The automatic ejection control method for an injection molding machine according to claim 4, characterized in that, The conditions for the injection molding machine to meet the extraction completion state in step S3 are: the insertion position signal is lost, the extraction position signal is received, the solenoid valve responsible for releasing the hydraulic clamp in the oil circuit is de-energized, and the solenoid valve responsible for extracting the object in the oil circuit is de-energized; the clamping position state in step S5 is: both the left and right release positions of the hydraulic clamp are lost, both the left and right clamping positions of the hydraulic clamp are received, and the clamping pressure meets the preset clamping pressure value.

6. The automatic ejection control method for an injection molding machine according to claim 1, characterized in that, Before step S1, the following steps are also included: preset the pressure and flow rate of automatic suction, preset the pressure and flow rate of automatic suction, and preset the pressure and flow rate of automatic clamping.

7. The automatic ejection control method for an injection molding machine according to claim 1, characterized in that, When pressing the automatic shutter button on the control panel as described in step S2, the following steps are also included: Another energizing signal is output to release the valve, which in turn energizes the pressure-holding solenoid valve connected in series in the clamping oil circuit.

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