Self-adaptive mold adjusting method according to mold size, mold adjusting system and injection molding machine

Abstract

The invention discloses a self-adaptive mold adjusting method according to the size of a mold, a mold adjusting system and an injection molding machine. The mold adjusting method comprises the following steps: determining a target mold thickness moving position; a mold locking force is applied to the mold through the movable mold plate at the target mold thickness position; a first real-time force value of the current mold locking force is obtained, and whether the first real-time force value reaches a preset mold locking target threshold value or not is judged; if yes, mold adjustment is completed; if not, the mold locking force is increased through hydraulic operation of the movable mold plate, and when the hydraulic operation of the movable mold plate reaches the upper limit, the target mold thickness moving position is determined again by adjusting the position of the tail plate till the first real-time force value reaches the mold locking target threshold value. According to the self-adaptive mold adjusting device, the required mold containing thickness can be adjusted in a self-adaptive manner along with the increase of the hydraulic acting force in the mold adjusting process through the in-plate hydraulic pressure of the movable mold plate and the limiting of the rotary gate plate on the push rod, the mold adjusting operation in a manual mode is not needed, and the one-key self-adaptive mold adjusting according to the size of the mold is realized.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to a method for adaptively adjusting molds according to mold size, a mold adjusting system and an injection molding machine. Background Art

[0002] With the development of industry, the requirements for some plastic products are getting higher and higher. Many mold structures are complex, requiring long mold opening stroke and large mold opening force. In today's injection molding production, mold replacement is very frequent, so the requirements for injection molding machines are gradually increasing. After the mold is replaced, due to changes in mold thickness, material, etc., the clamping force after mold closing also changes. Therefore, it is necessary to adjust the mold adjustment position and the mold to obtain the desired clamping force. However, the stress state of the elbow-type clamping mechanism is not ideal. Since the clamping force is mainly obtained by the deformation of the pull rod, the pull rod is too thick and the rigidity is too high, which will cause the force increase curve to rise too steeply and change too sensitively at the tightening point, making it difficult to adjust the mold. After long-term use, the mechanical parts of the elbow-type clamping device, such as the coring column and the bearing seat, may cause the clamping force to decrease due to wear. In addition, due to the use of a double elbow form, the clamping stroke design is limited (the maximum stroke is the elbow straight state), which is difficult to apply to large-scale or injection molding equipment that requires a long stroke.

[0003] In the mold adjustment scheme of traditional injection molding machines, it is easy to exceed the mold adjustment range of the injection molding machine during the mold adjustment process. If the mold is too thick or too thin, the toggle joint may not be locked or the mold cannot be pressed after locking, affecting normal production. In addition, since the traditional injection molding machine adopts a toggle structure, many links need to be manually operated. This manual operation has high requirements for operators and is prone to human errors, which may cause great economic losses and is not conducive to the promotion and use of injection molding machines.

[0004] Based on the above situation, the inventor has developed an injection molding machine that uses the hydraulic pressure inside the moving platen to provide the clamping force to replace the entire toggle clamping mechanism. The entire toggle clamping component between the rear platen and the moving platen is removed. The operation mode of the push rod + hydraulic pressure inside the moving platen can automatically and adaptively adjust the mold according to different mold sizes during the mold adjustment process. Summary of the invention

[0005] In response to one or more of the above problems, the present invention provides a method, a mold adjustment system and an injection molding machine that are adaptively adjusted according to the size of the mold. Through the internal hydraulic pressure of the movable mold plate and the limiting of the push rod by the rotating gate plate, the required mold thickness can be adaptively adjusted as the hydraulic force increases during the mold adjustment process. There is no need for manual mode operation, thus achieving "one-click" automatic mold adjustment.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: a method for adaptively adjusting mold according to mold size, comprising:

[0007] Determine the target mold thickness moving position;

[0008] Apply clamping force to the mold through the movable mold plate at the target mold thickness position;

[0009] Obtaining a first real-time force value of the current mold clamping force, and determining whether the first real-time force value reaches a preset mold clamping target threshold;

[0010] If yes, the mold adjustment is completed;

[0011] If not, the clamping force is increased by hydraulic operation of the movable platen. When the hydraulic force of the movable platen reaches the upper limit, the target mold thickness moving position is re-determined by adjusting the tail plate position until the first real-time force value reaches the clamping target threshold.

[0012] As a further improvement of the present invention, the step of determining the target mold thickness moving position includes:

[0013] Controlling the mold shifting cylinder of the tail plate to drive the movable platen to move to a first target position, wherein the first target position is pre-set according to the push rod length of the movable platen and / or a specified distance between the movable platen and the tail platen;

[0014] Drive the rotary gate to switch to the closed state to limit the push rod;

[0015] The tail plate and the movable plate are driven to move in the mold closing direction by the mold adjusting device on the tail plate until the mold is closed;

[0016] Obtaining a second real-time force value of the current mold clamping force, and determining whether the second real-time force value reaches a preset mold adjustment target threshold;

[0017] When the second real-time force value reaches the mold adjustment target threshold, the current mold thickness position is determined as the target mold thickness movement position.

[0018] As a further improvement of the present invention, applying a clamping force to the mold through a movable mold plate at a target mold thickness position includes:

[0019] The hydraulic operation of the clamping cylinder that controls the moving platen is controlled by a hydraulic integrated valve group on one side of the moving platen through the pipeline inside the platen into the rodless chamber of the clamping cylinder, so that the rodless chamber pushes the piston and the push rod fixedly connected to the piston. Since the push rod is limited by the rotating gate, the hydraulic force of the clamping cylinder pushes the moving platen in the opposite direction with the push rod as the support, thereby applying a clamping force to the mold.

[0020] As a further improvement of the present invention, the step of judging whether the first real-time force value reaches a preset mold locking target threshold value includes:

[0021] The first real-time force value is obtained by a clamping force sensor installed on the tie rod;

[0022] When the movable plate applies the clamping force to the mold, the clamping force starts to increase from the mold adjustment target threshold when the target mold thickness moving position is determined, until the first real-time force value reaches the clamping target threshold, indicating that the current mold thickness position can meet the clamping force required for mold production.

[0023] As a further improvement of the present invention, the target mold thickness moving position is re-determined by adjusting the position of the tail plate, including:

[0024] When the hydraulic pressure of the locking cylinder reaches the set upper limit condition and the first real-time force value fails to reach the locking target threshold, the tail plate is controlled to retreat a set distance, which is smaller than the stroke of the piston movement in the locking cylinder, and is used to increase the effective working area of ​​the rodless cavity of the locking cylinder to increase the hydraulic force until the first real-time force value reaches the locking target threshold.

[0025] As a further improvement of the present invention, the control of the tailgate retreating to a set distance includes:

[0026] When controlling the tail plate to retreat, first release the pressure on the hydraulic operation of the clamping cylinder, and then control the hydraulic operation of the clamping cylinder after retreating the set distance;

[0027] If the machine moves backward for multiple set distances, and the total backward distance is less than the stroke of the piston in the mold locking cylinder, when the total backward distance is ≥ the stroke of the piston, the mold adjustment is stopped and a fault signal is issued to stop the machine for inspection.

[0028] As a further improvement of the present invention, the driving rotating gate is switched to a closed state, comprising:

[0029] When the mold shifting cylinder drives the movable mold plate to move to the first target position, the hydraulic reset of the mold locking cylinder of the movable mold plate is controlled so that the piston is at the bottom of the mold locking cylinder, one end of the push rod is fixedly connected to the piston, and the other end is located in the limiting hole of the fixed plate body of the rotating gate plate and does not protrude from the limiting hole;

[0030] The rotary gate comprises a fixed plate body and a rotating plate body and a gate oil cylinder driving the rotating plate body to rotate around the axis of the central hole. When the rotating plate body rotates to a closed state, the rotating plate body overlaps with the fixed plate body so that the rotating plate body blocks the limiting hole of the fixed plate body; when the rotating plate body rotates to an open state, the rotating plate body and the fixed plate body are staggered with each other so that the avoidance position of the rotating plate body overlaps with the limiting hole of the fixed plate body, so that the push rod can pass through the limiting hole, the avoidance position, and the through hole of the tail plate for displacement;

[0031] The rotary gate is driven to switch to the closed state, so that the push rod is pressed against the rotating plate body under the hydraulic force of the locking cylinder, and is then fixed or limited to form a support. The hydraulic force of the locking cylinder acts in the opposite direction to the movable platen with the push rod as the support, so that the movable platen runs in the closing direction and / or applies a locking force to the mold.

[0032] As a further improvement of the present invention, the tail plate and the movable plate are driven to move in the mold closing direction by the mold adjusting device on the tail plate, including:

[0033] The tail plate moves in the mold closing direction through the mold adjusting device, and the rotating gate in the closed state pushes the push rod to move accordingly. The movable plate is pushed by the piston and moves toward the mold direction until the reading of the template position scale no longer changes, indicating that the mold is closed;

[0034] By monitoring the second real-time force value of the clamping force, when the second real-time force value reaches the mold adjustment target threshold, based on the current mold capacity thickness position, the mold adjustment device controls the tail plate to retreat a set distance to reserve hydraulic space for the rodless cavity of the clamping cylinder;

[0035] The current mold thickness position is determined as the target mold thickness moving position.

[0036] On the other hand, the present invention also provides another technical solution: an adaptive mold adjustment system, comprising a memory and a processor, wherein the processor calls a control program stored in the memory to execute the adaptive mold adjustment method according to the mold size as described above.

[0037] On the other hand, the present invention also provides another technical solution: an injection molding machine, comprising a memory and a processor, wherein the processor calls a control program stored in the memory to execute the above-mentioned method of adaptive mold adjustment according to mold size.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention uses the hydraulic pressure in the movable platen and the rotary gate to limit the push rod. During the mold adjustment process, the required mold thickness can be adaptively adjusted as the hydraulic force increases, avoiding manual mode operation and realizing "one-button" automatic mold adjustment. In the traditional solution, the mold is adjusted forward or backward by pressing the "mold adjustment forward key" / "mold adjustment backward key" when approaching the target clamping force. This embodiment can efficiently and conveniently realize adaptive mold adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solution, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 The figure is a schematic diagram for explaining the process of an embodiment of the present invention.

[0042] Figure 2 It is a process-oriented schematic diagram of an embodiment of the present invention.

[0043] Figure 3 It is a schematic structural diagram of an injection molding machine according to an embodiment of the present invention.

[0044] Figure 4 It is a schematic structural diagram of an injection molding machine according to an embodiment of the present invention.

[0045] Figure 5 Schematic diagram of the rotary gate structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable a clear and complete understanding of the technical solution, the present invention is further described in conjunction with the embodiments and drawings. Obviously, the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present invention.

[0047] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0048] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0049] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] The embodiment of the present invention provides a method for adaptively adjusting molds according to mold size. Through the hydraulic pressure inside the movable mold plate and the limit of the push rod by the rotating gate plate, the required mold thickness can be adaptively adjusted as the hydraulic force increases during the mold adjustment process. In order to better understand the concept of the present invention, it is necessary to explain the structure and operation mode of the injection molding machine of the present invention. Specifically, in combination with Figure 3-5 The injection molding machine includes a fixed platen 100, a movable platen 200, and a tail plate 300. The fixed platen 100 is connected to the movable platen 200 through tie rods 400 on four corners. The tie rods 400 pass through the movable platen 200 and are fixed to the tail plate 300. A rotating gate 500 is provided on the tail plate 300. There is a mold shifting cylinder 310 on each side of the tail plate 300. The piston rod of the mold shifting cylinder 310 is fixedly connected to the movable platen 100. The movable platen 200 is driven to move by the mold shifting cylinder 310 when the mold is closed / opened.

[0051] The movable template is provided with a plurality of locking cylinders 210, the piston of the locking cylinder 210 is fixedly connected to the end of the push rod 220, and the other end of the push rod 220 is arranged on the limiting hole 511 of the fixed plate body 510 of the rotating gate 500; the rodless chamber of the locking cylinder 210 (i.e., between the piston and the cylinder bottom) is connected through the inner plate pipeline of the movable template 200 (through drilling and processing on one side of the movable template, not an external pipeline, and is integrated with the movable template), and a hydraulic integrated valve group 230 is provided at the entrance and exit of the inner plate pipeline on one side of the movable template 200, which is used to connect the external hydraulic system and control the hydraulic operation of the locking cylinder.

[0052] The rotating gate 500 is installed on the tail plate 300. The rotating gate 500 includes a fixed plate body 510, a rotating plate body 520 and a gate oil cylinder 530. The fixed plate body 510 is provided with a limiting hole 511 for connecting a push rod, that is, the push rod can be displaced in the limiting hole along the axial direction of the hole. The gate oil cylinder 530 controls the rotation of the rotating plate body 520, so that the rotating plate body 520 can block the limiting hole to limit or fix the push rod and can open the limiting hole to allow the push rod 400 to displace in the limiting hole 511 without interference.

[0053] To further explain the operation mode of the injection molding machine, when the mold is closed, the mold moving cylinder 310 drives the movable mold plate 200 to close the mold. After it is in place, the rotating plate body 520 of the rotating gate 500 is switched to a closed state, such as Figure 3In the rotating gate shown in the figure, the rotating plate body and the fixed plate body are in the overlapped state. At this time, the hydraulic pressure of the clamping cylinder 210 of the movable plate 200 is operated, so that the piston drives the push rod 400 to press on the rotating plate body 520. At this time, the push rod 400 is fixed. As the hydraulic pressure increases, the clamping cylinder 210 and the movable plate 200 begin to move in the opposite direction toward the fixed plate 100, and apply the clamping force to the mold after the mold is closed. When opening the mold, first release the pressure of the clamping cylinder 210 and reset the hydraulic pressure, and then switch the rotating gate 500 to the open state, as shown in FIG. Figure 5 In the rotating gate shown, the rotating plate body and the fixed plate body are staggered with each other, and the movable plate 200 is pulled back in the mold opening direction by the mold shifting cylinder 310, while the push rod 400 can pass through the rotating plate body 520 and retreat along the through hole of the tail plate.

[0054] Based on the structure of the above-mentioned injection molding machine, this embodiment provides a method for adaptively adjusting the mold according to the mold size, referring to Figure 1 and Figure 2 ,include:

[0055] Determine the target mold thickness moving position;

[0056] Apply clamping force to the mold through the movable mold plate at the target mold thickness position;

[0057] Obtaining a first real-time force value of the current mold clamping force, and determining whether the first real-time force value reaches a preset mold clamping target threshold;

[0058] If yes, the mold adjustment is completed;

[0059] If not, the clamping force is increased by hydraulic operation of the movable platen, and when the hydraulic operation of the movable platen reaches the upper limit, the target mold thickness moving position is re-determined by adjusting the tail plate position until the first real-time force value reaches the clamping target threshold.

[0060] It can be understood by those skilled in the art that the target clamping threshold is to set the required clamping force value according to the projected area and material properties of the mold product. The clamping force sensor is installed on the clamping rod (Corinthian column) and can monitor the magnitude of the clamping force in real time.

[0061] It should be noted that the movement of the tail plate is achieved by the mold adjustment device on the tail plate, such as Figure 4 As shown, the mold adjusting device includes a mold adjusting gear 320 arranged in the middle of the side of the tail plate 300, a mold adjusting motor 330 driving the mold adjusting gear 320, and a mold adjusting stud 340 connected to the mold adjusting gear 320. The mold adjusting stud 340 is connected to the pull rod 400 so that the mold adjusting motor 330 drives the mold adjusting gear 320 and the mold adjusting stud 340 to rotate and cause axial displacement, thereby pushing the tail plate and / or the movable mold plate to cause axial displacement, which is used to adjust the mold thickness (the maximum and minimum thickness of the mold that the injection molding machine can accommodate) and the clamping force.

[0062] Through the above steps, "one-button" automatic mold adjustment is achieved, without manual control of the tail plate, moving mold plate and other components, and the clamping force of this embodiment is a linear expression that gradually increases from small to large. As long as the clamping target threshold is set, the required mold thickness of the current mold can be determined when the real-time force value of the clamping force increases to the clamping target threshold. In the traditional solution, the mold is adjusted forward or backward by pressing the "mold adjustment forward key" / "mold adjustment backward key" when approaching the target clamping force. This embodiment can efficiently and conveniently achieve adaptive mold adjustment.

[0063] In an optional embodiment, determining the target mold thickness moving position includes:

[0064] The mold shifting cylinder controlling the tail plate drives the movable plate to move to the first target position, and the first target position is pre-set according to the push rod length of the movable plate and / or the specified distance between the movable plate and the tail plate; in this embodiment, the clamping force is generated by the hydraulic pressure in the movable plate, and the push rod presses on the rotating gate plate, which is equivalent to pressing on the tail plate, and the length of the push rod is fixed, that is, the specified distance between the movable plate and the tail plate can also be pre-set. When the first target position is set so that the movable plate moves to the first target position, the push rod is located in the limit hole of the fixed plate body, does not affect the rotation of the rotating plate body, and the tail plate is located at the initial position;

[0065] Drive the rotary gate to switch to the closed state to limit the push rod;

[0066] The mold adjusting device on the tail plate drives the tail plate and the movable platen to move in the mold closing direction until the mold is closed. When the mold adjusting device drives the tail plate, the force output of the mold shifting cylinder can be released. At this time, the tail plate moves in the mold closing direction, and the push rod is pushed by the rotating gate, and then the push rod is transmitted to the piston, the mold locking cylinder, and the movable platen, so that the movable platen also moves in the mold closing direction, and the rodless cavity of the mold locking cylinder can be compressed between the movable platen and the tail plate, so that the piston can abut against the cylinder body;

[0067] Obtain the second real-time force value of the current mold clamping force, and determine whether the second real-time force value reaches a preset mold adjustment target threshold. Generally speaking, the mold adjustment target threshold is lower than the mold clamping target threshold. The setting of the mold adjustment target threshold only needs to overcome the resistance of mold closing, and should be set as low as possible, such as being able to offset the friction resistance of mold closing (friction resistance between the mold plate and the tie rod, friction resistance of the guide column and guide sleeve after the movable and fixed molds contact, friction resistance of the inclined guide column slider, friction resistance between the movable mold plate and the supporting component, etc.);

[0068] When the second real-time force value reaches the mold adjustment target threshold, the current mold thickness position is determined as the target mold thickness movement position.

[0069] This embodiment is to determine the mold thickness position when the mold is closed. In some embodiments, it can also be determined by obtaining the reading of the template position ruler. During the mold adjustment process, when the reading of the template position ruler no longer changes, that is, the mold has been closed by force, the reading of the template position ruler, that is, the initial thickness of the mold, is recorded, and the current mold thickness position is determined as the target mold thickness movement position. There are also some embodiments that determine the initial thickness of the mold through data provided by the mold manufacturer or through the value obtained by actually measuring the thickness of the mold, and when it moves to the mold thickness position, the current mold thickness position is determined as the target mold thickness movement position.

[0070] In an optional embodiment, the step of driving the tail plate and the movable platen to move in the mold closing direction by the mold adjusting device on the tail plate includes:

[0071] The tail plate moves in the mold closing direction through the mold adjusting device, and the rotating gate in the closed state pushes the push rod to move accordingly. The movable plate is pushed by the piston and moves toward the mold direction until the reading of the template position scale no longer changes, indicating that the mold is closed;

[0072] By monitoring the second real-time force value of the clamping force, when the second real-time force value reaches the mold adjustment target threshold, based on the current mold capacity thickness position, the mold adjustment device controls the tail plate to retreat by a set distance to reserve hydraulic space for the rodless cavity of the clamping cylinder, and the set distance is smaller than the stroke of the piston movement in the clamping cylinder;

[0073] The current mold thickness position is determined as the target mold thickness moving position.

[0074] In an optional embodiment, applying a clamping force to the mold through a movable platen at a target mold thickness position includes:

[0075] The hydraulic operation of the clamping cylinder that controls the moving platen is controlled by a hydraulic integrated valve group on one side of the moving platen through the pipeline inside the platen into the rodless chamber of the clamping cylinder, so that the rodless chamber pushes the piston and the push rod fixedly connected to the piston. Since the push rod is limited by the rotating gate, the hydraulic force of the clamping cylinder pushes the moving platen in the opposite direction with the push rod as the support, thereby applying a clamping force to the mold.

[0076] It can be understood by those skilled in the art that the sealing connection between the push rod and the clamping cylinder, and between the cylinder body and the cylinder cover of the clamping cylinder, etc. in this embodiment has an oil seal design. This embodiment does not impose any restrictions on the oil seal structure and materials, etc., and can be implemented using existing technologies. Furthermore, the present invention does not impose any restrictions on the structure of the hydraulic integrated valve group and the hydraulic control system. The hydraulic integrated valve group is generally a highly integrated component composed of a valve block, a hydraulic valve, auxiliary components, etc. The hydraulic control system is responsible for providing hydraulic power, and the technicians can set it according to actual use requirements. The existing hydraulic control technology can be used to control the flow, pressure and direction of the working oil of each pipeline through the hydraulic integrated valve group.

[0077] In an optional embodiment, the determining whether the first real-time force value reaches a preset mold locking target threshold includes:

[0078] The first real-time force value is obtained by a clamping force sensor installed on the tie rod;

[0079] When the movable plate applies the clamping force to the mold, the clamping force starts to increase from the mold adjustment target threshold when the target mold thickness moving position is determined, until the first real-time force value reaches the clamping target threshold, indicating that the current mold thickness position can meet the clamping force required for mold production.

[0080] In some embodiments, the clamping force is increased by the hydraulic operation of the movable platen. When the hydraulic operation of the movable platen reaches the upper limit, that is, when the hydraulic operation of the clamping cylinder reaches the limit or 90% limit or other set upper limits, the generated clamping force still fails to meet the target clamping force, that is, the first real-time force value does not reach the clamping target threshold. The working pressure of the clamping cylinder can be obtained from the pressure gauge of the hydraulic system or the external hydraulic control system, indicating that the hydraulic force of the current clamping cylinder is still insufficient. In this regard, when the hydraulic operation of the clamping cylinder reaches the set upper limit working condition, the first real-time force value fails to reach the clamping target threshold, and the tail plate is controlled to retreat a set distance, which is less than the stroke of the piston movement in the clamping cylinder, and is used to increase the effective action area of ​​the rodless cavity of the clamping cylinder to increase the hydraulic force until the first real-time force value reaches the clamping target threshold. Of course, in actual application scenarios, if the mold clamping force is too large, it is necessary to check the mold stress and appropriately reduce the clamping force. Long-term clamping operation at the highest rated working pressure may shorten the service life of the machine. It is generally recommended to use 80%-85% of the highest rated pressure.

[0081] Further, the step of controlling the tailgate to retreat a set distance comprises:

[0082] When controlling the tail plate to retreat, first release the pressure on the hydraulic operation of the clamping cylinder, and then control the hydraulic operation of the clamping cylinder after retreating the set distance;

[0083] For multiple retreat setting distances, the total retreat distance is less than the stroke of the piston movement in the clamping cylinder. When the total retreat distance ≥ the stroke of the piston movement, it means that the rodless cavity of the clamping cylinder compresses the rod cavity to the limit, and the push rod cannot press on the rotating gate to form a support. At this time, the mold adjustment is stopped and a fault signal is issued to stop the machine for inspection.

[0084] In order to better understand the role of the rotary gate in the adaptive mold adjustment, in an optional embodiment, the driving rotary gate is switched to a closed state, including:

[0085] When the mold shifting cylinder drives the movable mold plate to move to the first target position, the hydraulic reset of the mold locking cylinder of the movable mold plate is controlled so that the piston is at the bottom of the mold locking cylinder, one end of the push rod is fixedly connected to the piston, and the other end is located in the limiting hole of the fixed plate body of the rotating gate plate and does not protrude from the limiting hole;

[0086] The rotary gate comprises a fixed plate body and a rotating plate body and a gate oil cylinder driving the rotating plate body to rotate around the axis of the central hole. Figure 3 The rotating plate body overlaps with the fixed plate body so that the rotating plate body blocks the limiting hole of the fixed plate body; when the rotating plate body rotates to the open state (such as Figure 5 The rotating gate is in the state shown in the figure), the rotating plate body and the fixed plate body are staggered to make the avoidance position of the rotating plate body overlap with the limiting hole of the fixed plate body, so that the push rod can pass through the limiting hole, the avoidance position, and the through hole of the tail plate to move;

[0087] The rotary gate is driven to switch to the closed state, so that the push rod is pressed against the rotating plate body under the hydraulic force of the locking cylinder, and is then fixed or limited to form a support. The hydraulic force of the locking cylinder acts in the opposite direction to the movable platen with the push rod as the support, so that the movable platen runs in the closing direction and / or applies a locking force to the mold.

[0088] Obviously, the above embodiments are only used to illustrate the method steps of adaptive mold adjustment of the present invention, and are not intended to limit the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can adjust the above method steps so that the present invention can be applied to more specific application scenarios.

[0089] On the other hand, an adaptive mold adjustment system is also provided in an embodiment of the present invention, and the system is used to implement the above embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. Although the systems described in the following embodiments are preferably implemented in software, the implementation in hardware, or a combination of software and hardware, is also possible and conceivable. An adaptive mold adjustment system provided in this embodiment includes a memory and a processor, and the processor executes an adaptive mold adjustment method according to mold size as described in one or more of the above embodiments by calling a control program stored in the memory.

[0090] Optionally, in this embodiment, the processor may be configured to execute the following steps through a control program:

[0091] Determine the target mold thickness moving position;

[0092] Apply clamping force to the mold through the movable mold plate at the target mold thickness position;

[0093] Obtaining a first real-time force value of the current mold clamping force, and determining whether the first real-time force value reaches a preset mold clamping target threshold;

[0094] If yes, the mold adjustment is completed;

[0095] If not, the target mold thickness moving position is re-determined by adjusting the position of the tail plate until the first real-time force value reaches the mold locking target threshold.

[0096] On the other hand, the present invention also provides another embodiment: an injection molding machine, comprising a memory and a processor, wherein the processor calls a control program stored in the memory to execute a method for adaptively adjusting molds according to mold size as described in one or more of the above embodiments.

[0097] Optionally, in this embodiment, the processor may be configured to execute the following steps through a control program:

[0098] Determine the target mold thickness moving position;

[0099] Apply clamping force to the mold through the movable mold plate at the target mold thickness position;

[0100] Obtaining a first real-time force value of the current mold clamping force, and determining whether the first real-time force value reaches a preset mold clamping target threshold;

[0101] If yes, the mold adjustment is completed;

[0102] If not, the target mold thickness moving position is re-determined by adjusting the position of the tail plate until the first real-time force value reaches the mold locking target threshold.

[0103] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0104] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0105] The above disclosure is only one or more preferred embodiments of the present invention, which are used to help understand the inventive concept of the technical solution, and is not intended to limit the present invention in other forms. Technical personnel in the relevant field may make other equivalent or customary replacement schemes based on the features defined by the present invention, which still fall within the scope of the present invention.

Claims

1. A method for adaptively adjusting mold according to mold size, characterized in that: include: Determine the target mold thickness moving position; Apply clamping force to the mold through the movable mold plate at the target mold thickness position; Obtaining a first real-time force value of the current mold clamping force, and determining whether the first real-time force value reaches a preset mold clamping target threshold; If yes, the mold adjustment is completed; If not, the clamping force is increased by hydraulic operation of the movable platen, and when the hydraulic operation of the movable platen reaches the upper limit, the target mold thickness moving position is re-determined by adjusting the tail plate position until the first real-time force value reaches the clamping target threshold.

2. The method for adaptively adjusting mold according to mold size according to claim 1, characterized in that: Determining the target mold thickness moving position includes: Controlling the mold shifting cylinder of the tail plate to drive the movable platen to move to a first target position, wherein the first target position is pre-set according to the push rod length of the movable platen and / or a specified distance between the movable platen and the tail platen; Drive the rotary gate to switch to the closed state to limit the push rod; The tail plate and the movable plate are driven to move in the mold closing direction by the mold adjusting device on the tail plate until the mold is closed; Obtaining a second real-time force value of the current mold clamping force, and determining whether the second real-time force value reaches a preset mold adjustment target threshold; When the second real-time force value reaches the mold adjustment target threshold, the current mold thickness position is determined as the target mold thickness movement position.

3. The method for adaptively adjusting mold according to mold size according to claim 1, characterized in that: The method of applying a clamping force to the mold through the movable template at the target mold thickness position includes: controlling the hydraulic operation of the clamping cylinder of the movable template, and the hydraulic integrated valve group on one side of the movable template enters the rodless cavity of the clamping cylinder through the pipeline inside the plate, so that the rodless cavity pushes the piston and the push rod fixedly connected to the piston. Since the push rod is limited by the rotating gate plate, the hydraulic force of the clamping cylinder pushes the movable template in the opposite direction with the push rod as the support, thereby applying a clamping force to the mold.

4. The method for adaptively adjusting mold according to mold size according to claim 1, characterized in that: The determining whether the first real-time force value reaches a preset mold locking target threshold value includes: The first real-time force value is obtained by a clamping force sensor installed on the tie rod; When the movable plate applies the clamping force to the mold, the clamping force starts to increase from the mold adjustment target threshold when the target mold thickness moving position is determined, until the first real-time force value reaches the clamping target threshold, indicating that the current mold thickness position can meet the clamping force required for mold production.

5. The method for adaptively adjusting mold according to mold size according to claim 1, characterized in that: Re-determine the target mold thickness moving position by adjusting the tail plate position, including: When the hydraulic pressure of the locking cylinder reaches the set upper limit condition and the first real-time force value fails to reach the locking target threshold, the tail plate is controlled to retreat a set distance, which is smaller than the stroke of the piston movement in the locking cylinder, and is used to increase the effective working area of ​​the rodless cavity of the locking cylinder to increase the hydraulic force until the first real-time force value reaches the locking target threshold.

6. The method for adaptively adjusting mold according to mold size according to claim 5, characterized in that: The control of the tailgate retreating to a set distance comprises: When controlling the tail plate to retreat, first release the pressure on the hydraulic operation of the clamping cylinder, and then control the hydraulic operation of the clamping cylinder after retreating the set distance; If the machine moves backward for multiple set distances, and the total backward distance is less than the stroke of the piston in the mold locking cylinder, when the total backward distance is ≥ the stroke of the piston, the mold adjustment is stopped and a fault signal is issued to stop the machine for inspection.

7. The method for adaptively adjusting mold according to mold size according to claim 2, characterized in that: The driving of the rotating gate to switch to a closed state comprises: When the mold shifting cylinder drives the movable mold plate to move to the first target position, the hydraulic reset of the mold locking cylinder of the movable mold plate is controlled so that the piston is at the bottom of the mold locking cylinder, one end of the push rod is fixedly connected to the piston, and the other end is located in the limiting hole of the fixed plate body of the rotating gate plate and does not protrude from the limiting hole; The rotary gate comprises a fixed plate body and a rotating plate body and a gate oil cylinder driving the rotating plate body to rotate around the axis of the central hole. When the rotating plate body rotates to a closed state, the rotating plate body overlaps with the fixed plate body so that the rotating plate body blocks the limiting hole of the fixed plate body; when the rotating plate body rotates to an open state, the rotating plate body and the fixed plate body are staggered with each other so that the avoidance position of the rotating plate body overlaps with the limiting hole of the fixed plate body, so that the push rod can pass through the limiting hole, the avoidance position, and the through hole of the tail plate for displacement; The rotary gate is driven to switch to the closed state, so that the push rod is pressed against the rotating plate body under the hydraulic force of the clamping cylinder, and is then fixed or limited to form a support. The hydraulic force of the clamping cylinder acts in the opposite direction to the movable platen with the push rod as the support, so that the movable platen runs in the clamping direction and / or applies a clamping force to the mold.

8. The method for adaptively adjusting mold according to mold size according to claim 2, characterized in that: The method of driving the tail plate and the movable platen to move in the mold closing direction by the mold adjusting device on the tail plate comprises: The tail plate moves in the mold closing direction through the mold adjusting device, and the rotating gate in the closed state pushes the push rod to move accordingly. The movable plate is pushed by the piston and moves toward the mold direction until the reading of the template position scale no longer changes, indicating that the mold is closed; By monitoring the second real-time force value of the clamping force, when the second real-time force value reaches the mold adjustment target threshold, based on the current mold capacity thickness position, the mold adjustment device controls the tail plate to retreat a set distance to reserve hydraulic space for the rodless cavity of the clamping cylinder; The current mold thickness position is determined as the target mold thickness moving position.

9. An adaptive mold adjustment system, characterized in that: It comprises a memory and a processor, and is characterized in that the processor executes the method for adaptively adjusting mold according to mold size as described in any one of claims 1 to 8 by calling a control program stored in the memory.

10. An injection molding machine, comprising a memory and a processor, characterized in that: The processor calls the control program stored in the memory to execute the method for adaptively adjusting mold according to mold size as described in any one of claims 1 to 8.

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