Injection molding machine inventory control method, device and system

Abstract

The present application relates to the field of computer, particularly to a kind of injection molding machine storage control method, device and system, wherein injection molding machine storage control method can quickly pre-adjust screw before plasticizing, so that actual back pressure is below set back pressure, prevent the emergence of nozzle drooling and other problems caused by back pressure being too high in plasticizing stage;Further, through the coordinated adjustment of injection motor and plasticizing motor in plasticizing stage, the change of actual back pressure is more close to the set value, avoid the phenomenon of screw sudden stop, and the plasticizing motor starts to slow down when the screw reaches a certain position, instead of starting to slow down and stop running when reaching the end position of storage, so that the screw retraction speed is smaller, the end position of storage is smaller, and the repeatability of the end position of storage is guaranteed, so as to ensure the repeatability of production products.

Description

Technical Field

[0001] This invention relates to the field of computers, and in particular to a method, apparatus and system for controlling material storage in injection molding machines. Background Technology

[0002] In injection molding, the material storage function is a crucial part of automated injection molding, playing a vital role in stabilizing process conditions and obtaining precision, high-quality products. Back pressure is one of the most important process parameters affecting the material storage action, and a suitable and stable back pressure value is a necessary condition for ensuring product quality.

[0003] In the material storage process of an electric injection molding machine, the storage function is achieved through the coordinated actions of the plasticizing motor's rotation and the injection motor's retraction. The plasticizing motor drives the screw to rotate, causing the resin to continuously shear and accumulate towards the front of the barrel under the action of the screw's rotation. At the same time, it generates a high reverse force on the screw, which is the storage back pressure. The injection motor controls the screw's retraction speed in real time based on this actual back pressure to stabilize the pressure inside the barrel within the set back pressure range. To ensure uniform plasticization of the resin, existing electric injection molding machines typically only use PID control to control the back pressure. With this control method, the screw may retract abruptly due to a sudden increase in retraction speed, which may lead to air intake and affect the molding of the final product. At the same time, excessively fast retraction speed may also cause the actual pressure to fall below the set back pressure, causing the command speed to suddenly drop to zero and the screw to suddenly stop retracting. This results in an excessively long back pressure stabilization period, causing instability in the material storage process. In addition, when the pressure is controlled, the retraction speed is maintained until it reaches zero before the material storage end position is reached, resulting in the material storage end position being too large.

[0004] Therefore, existing injection molding machine material storage control methods suffer from significant back pressure control deviations, leading to problems in the material storage process. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, device, and system for controlling material storage in injection molding machines to address the aforementioned problems.

[0006] The present invention is implemented as follows: a method for controlling material storage in an injection molding machine, the method comprising:

[0007] S1: Monitor whether the actual back pressure exceeds the preset back pressure;

[0008] S2: If the actual back pressure is greater than the preset back pressure, the first back speed is determined based on the difference between the actual back pressure and the preset back pressure.

[0009] S3: Adjust the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure;

[0010] S4: Adjust the plasticizing motor to drive the screw to rotate in order to plasticize the material;

[0011] S5: During the plasticizing process of the stored material, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure.

[0012] S6: Adjust the injection motor drive screw to retract at the second retraction speed;

[0013] S7: Determine the first rotation speed based on the distance between the current position of the screw and the target retraction position;

[0014] S8: Adjust the speed of the plasticizing motor to make the screw rotate at the first rotational speed;

[0015] S9: Monitor whether the current position of the screw exceeds the retraction target position;

[0016] S10: If the current position of the screw does not exceed the retraction target position, repeat steps S5 to S8 until the current position of the screw exceeds the retraction target position, and stop plasticizing.

[0017] In one embodiment, the present invention provides a material storage control device for an injection molding machine, including a monitoring module, a processing module, a scheduling module, and a repetitive execution module. The modules cooperate with each other to execute the steps of the injection molding machine material storage control method as follows:

[0018] The monitoring module is used to monitor whether the actual back pressure exceeds the preset back pressure;

[0019] If the actual back pressure is greater than the preset back pressure, the processing module determines the first back-off speed based on the difference between the actual back pressure and the preset back pressure.

[0020] The adjustment module is used to adjust the injection motor drive screw to retract at a first retraction speed until the actual back pressure is less than the preset back pressure.

[0021] The control module is used to control the plasticizing motor to drive the screw to rotate, so as to plasticize the material;

[0022] The processing module is used to determine the second retraction speed based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure during the plasticization process of the stored material.

[0023] The adjustment module is used to adjust the injection motor drive screw to retract at a second retraction speed;

[0024] The processing module is used to determine the first rotational speed based on the distance between the current position of the screw and the retraction target position;

[0025] The adjustment module is used to adjust the speed of the plasticizing motor so that the screw rotates at the first rotational speed;

[0026] The monitoring module is used to monitor whether the current position of the screw exceeds the retraction target position;

[0027] If the current position of the screw does not exceed the retraction target position, the repeat execution module is used to re-execute steps S5 to S8 until the current position of the screw exceeds the retraction target position, and then stop plasticizing.

[0028] In one embodiment, the present invention provides a material storage control system for an injection molding machine, comprising:

[0029] The injection molding machine body includes an injection motor, a plasticizing motor, a screw, and a storage cylinder. The injection motor is used to drive the screw to move forward and backward in the storage cylinder, and the plasticizing motor is used to drive the screw to rotate in the storage cylinder. Furthermore, a pressure sensor is installed on the screw to sense the pressure on the screw.

[0030] A computer device, connected to the injection motor, plasticizing motor, and pressure sensor, is used to execute the aforementioned injection molding machine material storage control method.

[0031] This application provides a method, apparatus, and system for controlling material storage in an injection molding machine. The method includes: monitoring whether the actual back pressure exceeds a preset back pressure; if the actual back pressure is greater than the preset back pressure, determining a first retraction speed based on the difference between the actual back pressure and the preset back pressure; adjusting the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure; adjusting the plasticizing motor to drive the screw to rotate to plasticize the material; during the plasticizing process, determining a second retraction speed based on the change in actual back pressure and the change in the difference between the actual back pressure and the preset back pressure; adjusting the injection motor to drive the screw to retract at the second retraction speed; determining a first rotation speed based on the distance between the current position of the screw and the target retraction position; adjusting the rotation speed of the plasticizing motor to rotate the screw at the first rotation speed; monitoring whether the current position of the screw exceeds the target retraction position; if the current position of the screw does not exceed the target retraction position, repeating steps S5 to S8 until the current position of the screw exceeds the target retraction position, and stopping plasticizing. In this application, the screw can be quickly pre-adjusted before plasticizing to ensure that the actual back pressure is below the set back pressure, preventing problems such as nozzle drooling caused by excessive back pressure during the plasticizing stage. Furthermore, during the plasticizing stage, the coordinated adjustment of the injection motor and the plasticizing motor makes the change in actual back pressure closer to the set value, avoiding the phenomenon of sudden screw retraction and stopping. Moreover, the plasticizing motor begins to decelerate when the screw reaches a certain position, rather than slowing down and stopping only when it reaches the end position of material storage. This reduces the screw retraction speed and the deviation of the end position of material storage, ensuring the repeatability accuracy of the end position of material storage, thereby ensuring the repeatability accuracy of the produced products. Attached Figure Description

[0032] Figure 1 A flowchart of an injection molding machine material storage control method provided in one embodiment;

[0033] Figure 2 A block diagram of an injection molding machine material storage control device provided in one embodiment;

[0034] Figure 3 This is a schematic diagram of an injection molding machine material storage control system provided in one embodiment;

[0035] Figure 4 This is a block diagram of the internal structure of a computer device in one embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] It is understood that the terms "first," "second," etc., used in this invention may be used to describe various elements herein, but unless specifically stated otherwise, these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this invention, a first script may be referred to as a second script, and similarly, a second script may be referred to as a first script.

[0038] like Figure 1 As shown, in one embodiment, a method for controlling material storage in an injection molding machine is proposed, the method comprising:

[0039] S1: Monitor whether the actual back pressure exceeds the preset back pressure;

[0040] S2: If the actual back pressure is greater than the preset back pressure, the first back speed is determined based on the difference between the actual back pressure and the preset back pressure.

[0041] S3: Adjust the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure;

[0042] S4: Adjust the plasticizing motor to drive the screw to rotate in order to plasticize the material;

[0043] S5: During the plasticizing process of the stored material, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure.

[0044] S6: Adjust the injection motor drive screw to retract at the second retraction speed;

[0045] S7: Determine the first rotation speed based on the distance between the current position of the screw and the target retraction position;

[0046] S8: Adjust the speed of the plasticizing motor to make the screw rotate at the first rotational speed;

[0047] S9: Monitor whether the current position of the screw exceeds the retraction target position;

[0048] S10: If the current position of the screw does not exceed the retraction target position, repeat steps S5 to S8 until the current position of the screw exceeds the retraction target position, and stop plasticizing.

[0049] In this embodiment, a pressure sensor is installed on the screw. The computer equipment of the injection molding machine is connected to the pressure sensor, which can obtain the back pressure on the screw in real time, i.e., the actual back pressure. The pressure sensor in this embodiment can be a capacitive sensor, a piezoelectric sensor, a magnetic sensor, or other types of pressure sensor, which is not limited here. The preset back pressure can be 40 bar, 50 bar, 60 bar, or other back pressure values, which are selected according to the specific injection scheme and are not limited here. The computer equipment can be an independent physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud servers, cloud databases, cloud storage, and CDN.

[0050] In this application, the material storage process of the electric injection molding machine requires the coordinated action of two actions: the rotation of the plasticizing motor and the retraction of the injection motor. The plasticizing motor drives the screw to rotate, causing the material to continuously shear and accumulate towards the front end of the barrel under the action of the screw's rotation. Simultaneously, a high reverse force, i.e., back pressure, is generated on the screw. The computer equipment then uses this actual back pressure to control the screw's retraction speed in real time, stabilizing the pressure inside the barrel within the set back pressure range. In this application, the screw can be quickly pre-adjusted before plasticizing to ensure the actual back pressure is below the set back pressure, preventing problems such as nozzle drooling due to excessive back pressure during the plasticizing stage. Furthermore, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between the actual back pressure and the preset back pressure. This ensures that the change in actual back pressure is closer to the set value when the screw retracts at the second retraction speed, avoiding sudden screw retraction and stopping, and thus preventing the introduction of air into the storage barrel, which could affect the plasticizing process. The first rotational speed is determined based on the distance between the current position of the screw and the target retraction position. The speed of the plasticizing motor is adjusted to make the screw rotate at the first rotational speed. This ensures that the plasticizing motor begins to decelerate when the screw reaches a certain position, rather than stopping only when the material storage end position is reached. This reduces the screw retraction speed and the deviation of the material storage end position, ensuring the repeatability accuracy of the material storage end position and thus ensuring the repeatability accuracy of the produced products. In addition, during the entire plasticizing process, the second retraction speed is determined based on the actual back pressure change and the difference between the actual back pressure and the preset back pressure, which is related to the plasticizing motor driving the screw to rotate and plasticize the material. The first rotational speed is determined based on the distance between the current position of the screw and the target retraction position, which is related to the injection motor driving the screw retraction. This means that the plasticizing motor and the injection motor work in synergy, ensuring that the adjustment process of both is always kept within a reasonable range, avoiding the impact of excessive adjustment of one motor on the entire plasticizing process.

[0051] As a preferred embodiment, the first rollback speed is determined by the following formula:

[0052] n1 = k po ×e t

[0053] Where n1 is the first retraction speed, k po This is the first proportional gain term, where et is the difference between the actual back pressure and the preset back pressure. t It can be obtained using the following formula:

[0054] e t =P f- P s

[0055] Among them, P fP represents the actual back pressure value. s This is the preset back pressure value.

[0056] In this embodiment, k po The value is 8; before the plasticizing process, the back pressure on the screw is relatively high (usually exceeding the preset back pressure), so the screw needs to be retracted first to relieve pressure; during the pressure relief process, as the screw retracts, P f Gradually decrease, leading to e t The speed gradually decreases, thus causing the first retraction speed n1 to gradually decrease, when e t When n1 is reduced to 0, n1 also decreases to 0, which means that the screw retraction can be stopped when the actual back pressure is just lower than the set back pressure, thus avoiding the impact of excessively low back pressure on the subsequent plasticizing process.

[0057] As a preferred embodiment, the second rollback speed is determined by the following formula:

[0058] n t =k v ×Δp t +k p1 ×e t + k il ×u i + k dl ×Δe

[0059] Where, n t For the second backtracking speed, k v k is the second proportional gain coefficient. p1 The third proportional gain coefficient, Δp t Δe is the change in actual back pressure, and k is the change in the difference between actual back pressure and preset back pressure. il k is the integral coefficient. dl U is the differential coefficient. i This is the cumulative difference between the actual back pressure and the preset back pressure.

[0060] The actual change in back pressure Δp t It can be obtained using the following formula:

[0061] Δp t =p f -p f-1

[0062] Among them, P f-1 This is the actual back pressure value detected in the previous monitoring.

[0063] The change Δe between the actual back pressure and the preset back pressure is obtained by the following formula:

[0064] Δe=e t -et-1

[0065] Among them, e t-1 This is the difference between the actual back pressure detected in the last monitoring and the preset back pressure;

[0066] The cumulative difference between the actual back pressure and the preset back pressure, u i It can be obtained using the following formula:

[0067] u i =u i-1 +e t

[0068] Among them, u i-1 This is the cumulative difference between the actual back pressure obtained after the previous accumulation and the preset back pressure.

[0069] Additionally, determine the second backtracking speed n t Is it greater than the preset maximum second backtracking speed n? max If n t Greater than n max Then n t The value is n max ;

[0070] Determine the second backtracking speed n t Is it less than 0? If n t If n is less than 0, then t The value is 0.

[0071] In this embodiment, the maximum value of the second back-off speed n max The second proportional gain coefficient k is 60.00 mm / s. v The third proportional gain coefficient k is 10. p1 6, integral coefficient k il The time is 0.02s, and the differential coefficient k dl The value is 0.01s; this application introduces the actual back pressure change Δp. t And the change Δe in the difference between the actual back pressure and the preset back pressure, and also due to Δp t The relationship between Δe and the rotational speed of the plasticizing motor enables coordinated adjustment of the second retraction speed and the first rotational speed. This ensures that the actual back pressure remains near the set back pressure value during screw retraction, guaranteeing back pressure stability. Furthermore, the maximum value n of the second retraction speed... max The setting of boundaries such as 0 speed avoids the problem of excessive screw retraction speed or reverse movement, further improving the stability of screw retraction.

[0072] As a preferred embodiment, the first rotational speed is determined by the following formula:

[0073] Nt =k n ×ΔS

[0074] Where, N t Let k be the first rotational speed. n The second proportional gain coefficient is ΔS, which is the distance between the current position and the target position for retreating.

[0075] ΔS is obtained using the following formula:

[0076] ΔS=S r -S t

[0077] Among them, S r Target retreat distance, S t This represents the current backtracking distance.

[0078] Second proportional gain coefficient k n It can be obtained using the following formula:

[0079] k n =N s / L s

[0080] Where, N s To set the rotation speed, L s To set the deceleration distance;

[0081] Set deceleration distance L s It can be obtained using the following formula:

[0082]

[0083] Where T is the set deceleration duration, T p To set the back pressure control cycle, N max To set the maximum rotational speed, n f The preset back-off speed filter value;

[0084] Back-off speed filter value n f The initial value is:

[0085] n f =n max / 2

[0086] Where, n max To set the maximum rollback speed.

[0087] Determine the second proportional gain coefficient k n Is it greater than the preset maximum value of the second proportional gain coefficient k? nmax If k n Greater than k nmax Then k n Value knmax ;

[0088] Determine the second proportional gain coefficient k n Is it less than the preset minimum value k of the second proportional gain coefficient? nmin If k n Less than k nmin Then k n Value k nmin .

[0089] In this embodiment, the deceleration duration T can be set to 100ms, and the back pressure control period T can be set to... p It can be 1ms, set the maximum rotation speed N. max You can take 400rpm, k nmax You can choose 12, k nmin You can choose 3 to set the maximum rotation speed N. min 50 rpm can be used; this application introduces a back-off speed filter value n f This achieves coordinated adjustment of the first rotation speed and the screw retraction speed, avoiding the problem of the screw rotation speed being too fast or too slow during the screw retraction process, keeping the actual back pressure always near the set back pressure value, and further ensuring the stability of the back pressure.

[0090] As a preferred embodiment, the cumulative time T during the plasticizing process is monitored. to Is it less than the set plasticizing time T? f If T to Less than T f Then for n f The following adjustments will be made:

[0091] n f =n f-1 ×(1-A)+n t ×A

[0092] Where, n f-1 The previous backtracking speed filter value is denoted by A, where A is the filter coefficient.

[0093] If T to Greater than T f Then determine S t Is it greater than S? r If S t Greater than S r Then plasticization will stop;

[0094] If S t Less than S r If the screw position exceeds the retraction target position, then repeat steps S5 to S8 until plasticizing stops.

[0095] In this embodiment, Tf The value is T to-1 / 2,T to-1 The cumulative time taken for the previous monitoring of the plasticizing process is A, which ranges from 0.1 to 0.9. This application monitors the screw position in real time and adjusts the screw retraction speed according to the distance between the screw and the target position. That is, the closer to the target position, the slower the screw retraction speed, which can ensure that the screw can stop in time when it reaches the target position and avoid the problem of excessive screw retraction.

[0096] like Figure 2 As shown, in one embodiment, an injection molding machine material storage control device is provided, including a monitoring module, a processing module, an adjustment module, and a repetitive execution module. The modules cooperate with each other to execute the injection molding machine material storage control method as follows:

[0097] The monitoring module is used to monitor whether the actual back pressure exceeds the preset back pressure;

[0098] If the actual back pressure is greater than the preset back pressure, the processing module determines the first back-off speed based on the difference between the actual back pressure and the preset back pressure.

[0099] The adjustment module is used to adjust the injection motor drive screw to retract at a first retraction speed until the actual back pressure is less than the preset back pressure.

[0100] The control module is used to control the plasticizing motor to drive the screw to rotate, so as to plasticize the material;

[0101] The processing module is used to determine the second retraction speed based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure during the plasticization process of the stored material.

[0102] The adjustment module is used to adjust the injection motor drive screw to retract at a second retraction speed;

[0103] The processing module is used to determine the first rotational speed based on the distance between the current position of the screw and the retraction target position;

[0104] The adjustment module is used to adjust the speed of the plasticizing motor so that the screw rotates at the first rotational speed;

[0105] The monitoring module is used to monitor whether the current position of the screw exceeds the retraction target position;

[0106] If the current position of the screw does not exceed the retraction target position, the repeat execution module is used to re-execute steps S5 to S8 until the current position of the screw exceeds the retraction target position, and then stop plasticizing.

[0107] In this embodiment, through the coordinated operation of various modules, the screw can be quickly pre-adjusted before plasticizing, ensuring that the actual back pressure is below the set back pressure. This prevents problems such as nozzle drooling caused by excessive back pressure during the plasticizing stage. Furthermore, during the plasticizing stage, the coordinated adjustment of the injection motor and the plasticizing motor makes the change in actual back pressure closer to the set value, avoiding the phenomenon of sudden screw retraction and stopping. Moreover, the plasticizing motor begins to decelerate when the screw reaches a certain position, rather than only slowing down and stopping when it reaches the end position of material storage. This reduces the screw retraction speed and the deviation of the end position of material storage, ensuring the repeatability accuracy of the end position of material storage, thereby ensuring the repeatability accuracy of the produced products.

[0108] like Figure 3 As shown, in one embodiment, an injection molding machine material storage control system is provided, including:

[0109] The injection molding machine body includes an injection motor, a plasticizing motor, a screw, and a storage cylinder. The injection motor is used to drive the screw to move forward and backward in the storage cylinder, and the plasticizing motor is used to drive the screw to rotate in the storage cylinder. Furthermore, a pressure sensor is installed on the screw to sense the pressure on the screw.

[0110] A computer device, connected to the injection motor, plasticizing motor, and pressure sensor, is used to execute the aforementioned injection molding machine material storage control method.

[0111] In this embodiment, the computer device can be an independent physical server or terminal, or a server cluster consisting of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud servers, cloud databases, cloud storage, and CDN. The computer device is connected to a pressure sensor, which can obtain the back pressure on the screw in real time, i.e., the actual back pressure. The pressure sensor can be a capacitive sensor, a piezoelectric sensor, a magnetic sensor, or other types of pressure sensors. The screw type can be a mixing screw, a variable diameter screw, a gradient screw, or other types of screws, which is not limited here. The shape of the storage cylinder depends on the selected screw type. The injection motor and the plasticizing motor can be servo motors, variable frequency motors, hydraulic motors, or other types of motors, which is not limited here.

[0112] In this application, the screw can be quickly pre-adjusted before plasticizing to ensure that the actual back pressure is below the set back pressure, preventing problems such as nozzle drooling caused by excessive back pressure during the plasticizing stage. Furthermore, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between the actual back pressure and the set back pressure. This ensures that the change in actual back pressure is closer to the set value when the screw retracts at the second retraction speed, avoiding sudden stops and preventing the introduction of air into the storage cylinder, which could affect the plasticizing process. Moreover, the first rotational speed is determined based on the distance between the screw's current position and the target retraction position, and the rotational speed of the plasticizing motor is adjusted to make the screw rotate at the first rotational speed. This ensures that the plasticizing motor begins to decelerate when the screw reaches a certain position, rather than decelerating further. The screw only slows down and stops when it reaches the end position of the material storage, thus reducing the screw retraction speed and minimizing the deviation of the material storage end position, ensuring the repeatability accuracy of the material storage end position and consequently ensuring the repeatability accuracy of the produced products. Furthermore, throughout the plasticizing process, the second retraction speed is determined based on the actual change in back pressure and the difference between the actual back pressure and the preset back pressure, which is related to the plasticizing motor driving the screw to rotate and plasticize the material. The first rotation speed is determined based on the distance between the screw's current position and the target retraction position, which is related to the injection motor driving the screw retraction. This synergy between the plasticizing motor and the injection motor ensures that their adjustments remain within a reasonable range, preventing excessive adjustment of one motor from affecting the entire plasticizing process.

[0113] Figure 4 An internal structural diagram of a computer device in one embodiment is shown. Figure 4 As shown, the computer device includes a processor, memory, network interface, input device, and display screen connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program. When executed by the processor, the computer program enables the processor to implement the injection molding machine material storage control method provided in this embodiment of the invention. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the injection molding machine material storage control method provided in this embodiment of the invention. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, a trackball, or a touchpad provided on the casing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0114] Those skilled in the art will understand that Figure 4The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0115] In one embodiment, the injection molding machine material storage control device provided by this invention can be implemented as a computer program, and the computer program can be implemented as follows: Figure 2 The computer device shown runs on this device. The computer device's memory can store the various program modules that make up the injection molding machine's material storage control device, for example... Figure 2 The monitoring module, processing module, scheduling module, and repetitive execution module are shown. The computer program, comprised of these modules, causes the processor to execute the steps of the injection molding machine material storage control method described in the various embodiments of the present invention.

[0116] For example, Figure 4 The computer device shown can be used as follows Figure 2 The monitoring module in the injection molding machine material storage control device shown executes steps S1 and S9; the computer device can execute steps S2, S5 and S7 through the processing module; the computer device can execute steps S3, S4, S6 and S8 through the scheduling module; and the computer device can execute step S10 through the repeat execution module.

[0117] In one embodiment, a computer device is provided, the computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the following steps:

[0118] S1: Monitor whether the actual back pressure exceeds the preset back pressure;

[0119] S2: If the actual back pressure is greater than the preset back pressure, the first back speed is determined based on the difference between the actual back pressure and the preset back pressure.

[0120] S3: Adjust the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure;

[0121] S4: Adjust the plasticizing motor to drive the screw to rotate in order to plasticize the material;

[0122] S5: During the plasticizing process of the stored material, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure.

[0123] S6: Adjust the injection motor drive screw to retract at the second retraction speed;

[0124] S7: Determine the first rotation speed based on the distance between the current position of the screw and the target retraction position;

[0125] S8: Adjust the speed of the plasticizing motor to make the screw rotate at the first rotational speed;

[0126] S9: Monitor whether the current position of the screw exceeds the retraction target position;

[0127] S10: If the current position of the screw does not exceed the retraction target position, repeat steps S5 to S8 until the current position of the screw exceeds the retraction target position, and stop plasticizing.

[0128] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, causes the processor to perform the following steps:

[0129] S1: Monitor whether the actual back pressure exceeds the preset back pressure;

[0130] S2: If the actual back pressure is greater than the preset back pressure, the first back speed is determined based on the difference between the actual back pressure and the preset back pressure.

[0131] S3: Adjust the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure;

[0132] S4: Adjust the plasticizing motor to drive the screw to rotate in order to plasticize the material;

[0133] S5: During the plasticizing process of the stored material, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure.

[0134] S6: Adjust the injection motor drive screw to retract at the second retraction speed;

[0135] S7: Determine the first rotation speed based on the distance between the current position of the screw and the target retraction position;

[0136] S8: Adjust the speed of the plasticizing motor to make the screw rotate at the first rotational speed;

[0137] S9: Monitor whether the current position of the screw exceeds the retraction target position;

[0138] S10: If the current position of the screw does not exceed the retraction target position, repeat steps S5 to S8 until the current position of the screw exceeds the retraction target position, and stop plasticizing.

[0139] It should be understood that although the steps in the flowcharts of the various embodiments of the present invention are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the various embodiments may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.

[0140] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0141] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for controlling material storage in an injection molding machine, characterized in that, The method includes: S1: Monitor whether the actual back pressure exceeds the preset back pressure; S2: If the actual back pressure is greater than the preset back pressure, the first back speed is determined based on the difference between the actual back pressure and the preset back pressure. S3: Adjust the injection motor to drive the screw to retract at the first retraction speed until the actual back pressure is less than the preset back pressure; S4: Adjust the plasticizing motor to drive the screw to rotate in order to plasticize the material; S5: During the plasticizing process of the stored material, the second retraction speed is determined based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure. S6: Adjust the injection motor drive screw to retract at the second retraction speed; S7: Determine the first rotation speed based on the distance between the current position of the screw and the target retraction position; S8: Adjust the speed of the plasticizing motor to make the screw rotate at the first rotational speed; S9: Monitor whether the current position of the screw exceeds the retraction target position; S10: If the current position of the screw does not exceed the retraction target position, repeat steps S5 to S8 until the current position of the screw exceeds the retraction target position, and stop plasticizing; The second retraction speed is determined using the following formula: e in, For the second retreat speed, This is the second proportional gain coefficient. This is the third proportional gain coefficient. This represents the actual change in back pressure. e represents the change in the difference between the actual back pressure and the preset back pressure. The integral coefficient is... The differential coefficients are... This is the cumulative difference between the actual back pressure and the preset back pressure. Actual back pressure change It can be obtained using the following formula: in, This is the actual back pressure value detected in the previous monitoring. The change in the difference between the actual back pressure and the preset back pressure It can be obtained using the following formula: in, This is the difference between the actual back pressure detected in the last monitoring and the preset back pressure; Cumulative difference between actual back pressure and preset back pressure It can be obtained using the following formula: in, This is the cumulative difference between the actual back pressure obtained after the previous accumulation and the preset back pressure.

2. The method according to claim 1, characterized in that, The first retraction speed is determined using the following formula: in, The first rollback speed, This is the first proportional gain term. This is the difference between the actual back pressure and the preset back pressure. It can be obtained using the following formula: in, This is the actual back pressure value. This is the preset back pressure value.

3. The method according to claim 1, characterized in that, Determine the second rollback speed Is it greater than the preset maximum second rollback speed? ,like Greater than ,but Values ; Determine the second rollback speed Is it less than 0? If less than 0, then The value is 0.

4. The method according to claim 1, characterized in that, The first rotational speed is determined using the following formula: in, The first rotational speed, This is the second proportional gain coefficient. This represents the distance between the current position and the target position for rewinding. It can be obtained using the following formula: in, Target retreat distance, This represents the current backtracking distance. Second proportional gain coefficient It can be obtained using the following formula: in, To set the rotation speed, To set the deceleration distance; Set deceleration distance It can be obtained using the following formula: in, To set the deceleration duration, To set the back pressure control cycle, To set the maximum rotation speed, The preset back-off speed filter value; Back-off speed filter value The initial value is: in, To set the maximum rollback speed.

5. The method according to claim 4, characterized in that, Determine the second proportional gain coefficient Is it greater than the preset maximum value of the second proportional gain coefficient? ,like Greater than ,but Value ; Determine the second proportional gain coefficient Is it less than the preset minimum value of the second proportional gain coefficient? ,like ,but Value .

6. The method according to claim 4, characterized in that, Monitoring the cumulative time taken during the plasticizing process Is it less than the set plasticizing time? ,like Less than Then for The following adjustments will be made: in, This is the previous backoff speed filter value. These are the filter coefficients.

7. The method according to claim 6, characterized in that, like Greater than Then judge Is it greater than ,like Greater than Then plasticization will stop; like Less than If the screw position exceeds the retraction target position, then repeat steps S5 to S8 until plasticizing stops.

8. A material storage control device for an injection molding machine, characterized in that, It includes a monitoring module, a processing module, a mobilization module, and a repetitive execution module. These modules cooperate with each other to perform the steps in claim 1 as follows: The monitoring module is used to monitor whether the actual back pressure exceeds the preset back pressure; If the actual back pressure is greater than the preset back pressure, the processing module determines the first back-off speed based on the difference between the actual back pressure and the preset back pressure. The adjustment module is used to adjust the injection motor drive screw to retract at a first retraction speed until the actual back pressure is less than the preset back pressure. The control module is used to control the plasticizing motor to drive the screw to rotate, so as to plasticize the material; The processing module is used to determine the second retraction speed based on the change in actual back pressure and the change in the difference between actual back pressure and preset back pressure during the plasticization process of the stored material. The adjustment module is used to adjust the injection motor drive screw to retract at a second retraction speed; The processing module is used to determine the first rotational speed based on the distance between the current position of the screw and the retraction target position; The adjustment module is used to adjust the speed of the plasticizing motor so that the screw rotates at the first rotational speed; The monitoring module is used to monitor whether the current position of the screw exceeds the retraction target position; If the current position of the screw does not exceed the retraction target position, the repeat execution module is used to re-execute steps S5 to S8 until the current position of the screw exceeds the retraction target position, and then stop plasticizing. The second retraction speed is determined using the following formula: e in, For the second retreat speed, This is the second proportional gain coefficient. This is the third proportional gain coefficient. This represents the actual change in back pressure. e represents the change in the difference between the actual back pressure and the preset back pressure. The integral coefficient is... The differential coefficients are... This is the cumulative difference between the actual back pressure and the preset back pressure. Actual back pressure change It can be obtained using the following formula: in, This is the actual back pressure value detected in the previous monitoring. The change in the difference between the actual back pressure and the preset back pressure It can be obtained using the following formula: in, This is the difference between the actual back pressure detected in the last monitoring and the preset back pressure; Cumulative difference between actual back pressure and preset back pressure It can be obtained using the following formula: in, This is the cumulative difference between the actual back pressure obtained after the previous accumulation and the preset back pressure.

9. A material storage control system for an injection molding machine, characterized in that, include: The injection molding machine body includes an injection motor, a plasticizing motor, a screw, and a storage cylinder. The injection motor is used to drive the screw to move forward and backward in the storage cylinder, and the plasticizing motor is used to drive the screw to rotate in the storage cylinder. Furthermore, a pressure sensor is installed on the screw to sense the pressure on the screw. A computer device, connected to an injection motor, a plasticizing motor, and a pressure sensor, is used to execute the injection molding machine material storage control method as described in any one of claims 1-7.

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