Injection molding machine with mold parallelism control structure and control method thereof

Abstract

The invention relates to an injection molding machine with a mold parallelism control structure and a control method of the injection molding machine. The injection molding machine comprises a mold closing structure, a mold, a plurality of range finders and a controller, the mold closing structure comprises a fixed mold plate, a movable mold plate and a plurality of first driving pieces, the fixed mold plate and the movable mold plate are oppositely arranged, and the multiple first driving pieces are arranged on the end face, away from the fixed mold plate, of the movable mold plate; the mold comprises a fixed mold and a movable mold; the range finders are arranged on the mold, the range finders are in one-to-one correspondence with the first driving parts, and the mounting positions of the range finders correspond to the mounting positions of the first driving parts; the controller is electrically connected with the distance measuring instrument and the first driving piece. Therefore, when the first driving piece on the movable mold plate moves, the distance measuring instrument can accurately measure the distance change of the position, corresponding to the first driving piece, of the movable mold, the distance measuring instrument feeds back the measuring result to the controller, and then the controller controls the corresponding first driving piece to adjust the moving speed and distance. The measuring results of the multiple range finders are kept consistent within a certain range, the moving accuracy and parallelism of the movable mold are effectively improved, and it can be guaranteed that the thickness of a product is more uniform and more accurate in the injection molding and foaming process.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to an injection molding machine with a mold parallelism control structure and a control method thereof. Background Art

[0002] Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding machines are generally equipped with injection screws, clamping structures and molds. The clamping structure is used to drive the mold to open and close. The injection screw can heat the plastic and apply high pressure to the molten plastic, ejecting the molten plastic out of the screw and filling the mold cavity. With the development of plastic parts, especially plastic parts in the field of new energy vehicles, parts produced by conventional injection molding technology have been difficult to meet the current growing functionality and performance requirements. Combining injection compression technology with mold opening and foaming technology to produce more lightweight and system-integrated products has become an industry trend.

[0003] In order to ensure the stability and uniformity of the product wall thickness, the movable platen moves with the movable mold during the injection compression process and the mold opening and foaming process, and needs to always remain parallel to the fixed mold. In the automotive field, the tonnage of injection molding machines is basically around 1,600 to 4,000 tons, and the mold weight is in the range of 15 to 40 tons. Therefore, the corresponding movable platen plus the movable mold weight range is around 25 to 57 tons. Therefore, controlling the parallel movement of the movable mold has certain technical difficulties.

[0004] In existing injection molding machines, whether in the injection compression process or the mold opening compression technology, the movable mold half driven by the movable mold plate needs to always maintain a parallel relationship with the fixed mold half, otherwise the wall thickness of the product will have serious deviations. If the equipment is found to have a problem caused by suspected template non-parallelism, it is necessary to stop the machine and perform manual measurement. Manual measurement will inevitably lead to excessive downtime and affect processing efficiency. If no problem is found, the equipment needs to be properly tested when it is shut down for maintenance. If the problem is found during the equipment maintenance, the equipment will run for a long time in a state where the template is not parallel, which will inevitably lead to equipment damage or mold damage and product defects. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an injection molding machine with a mold parallelism control structure and a control method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An injection molding machine with a mold parallelism control structure, comprising:

[0008] A mold clamping structure, the mold clamping structure comprising a fixed mold plate, a movable mold plate and a plurality of first driving members, the fixed mold plate is arranged opposite to the movable mold plate, and the plurality of first driving members are arranged on an end surface of the movable mold plate away from the fixed mold plate, and are used to drive the movable mold plate to approach or move away from the fixed mold plate;

[0009] A mold, wherein the mold comprises a fixed mold and a movable mold, the movable mold is connected to the movable mold plate, and the fixed mold is connected to the fixed mold plate;

[0010] a plurality of distance meters, each of which is arranged on the mold, has a one-to-one correspondence with the first driving member, and an installation position of the distance meter corresponds to an installation position of the first driving member, and is used to detect the distance between the parting surface of the movable mold and the parting surface of the fixed mold at the corresponding installation position of the first driving member;

[0011] A controller is electrically connected to the rangefinder and the first driving member respectively, and is used to control the first driving member at a corresponding installation position according to a detection result of the rangefinder.

[0012] In one embodiment, the rangefinder includes a transmitter and a receiver, the transmitter is arranged on the fixed mold or the movable mold, and the receiver is correspondingly arranged on the movable mold or the fixed mold, the transmitter and the receiver are arranged opposite to each other, and the receiver is used to receive the signal transmitted by the transmitter; the installation position of the transmitter is parallel to the parting surface of the fixed mold or the movable mold, and the installation position of the receiver is correspondingly parallel to the parting surface of the movable mold or the fixed mold.

[0013] In one embodiment, the first driving member includes a high-pressure oil cylinder, a proportional valve and a hydraulic power source, the high-pressure oil cylinder is connected to the end surface of the movable template away from the fixed template, the proportional valve is respectively connected to the high-pressure oil cylinder and the hydraulic power source, and the controller is connected to the proportional valve for controlling the flow and pressure of the proportional valve according to the detection result of the rangefinder.

[0014] In one of the embodiments, the injection molding machine further includes a second driving member, which is disposed on an end surface of the movable platen close to the fixed platen and is used to drive the movable platen to approach or move away from the fixed platen.

[0015] In one embodiment, the injection molding machine also includes a sealing frame and a telescopic driving component. The sealing frame is arranged around the injection molded foam product and is used to abut against the four sides of the injection molded foam product. The telescopic driving component is connected to the sealing frame and is used to change the distance that the sealing frame is pushed out or retracted from the mold surface.

[0016] A control method for an injection molding machine, applicable to the above-mentioned injection molding machine, comprises the following steps:

[0017] S1: Zero point calibration of multiple rangefinders;

[0018] S2: preset the opening and closing size of the mold;

[0019] S3: controlling the first driving member so that the movable platen moves closer to or away from the fixed platen;

[0020] S4: during the movement of the moving template, obtaining the detection results of the plurality of rangefinders;

[0021] S5: controlling the plurality of first driving members so that the detection results of the plurality of rangefinders are consistent;

[0022] S6: When the detection results of the plurality of distance meters reach the opening and closing size, controlling the first driving member so that the movable plate and the fixed plate remain relatively still;

[0023] S7: when the moving template is stationary, obtaining detection results of multiple rangefinders;

[0024] S8: Control the plurality of first driving members so that the detection results of the plurality of rangefinders are consistent with the opening and closing size.

[0025] In one embodiment, the step S1 includes the following steps:

[0026] Controlling the first driving member so that the movable platen moves close to the fixed platen to enter a mold clamping calibration state, wherein the calibration mold clamping force of the first driving member is 50% of the maximum mold clamping force;

[0027] In the mold closing calibration state, a plurality of distance meters are subjected to zero point calibration.

[0028] In one embodiment, step S5 includes the following specific steps:

[0029] Selecting any one of the rangefinders as a target rangefinder, and rangefinders other than the target rangefinder as other rangefinders, and obtaining a result difference between a detection result of the target rangefinder and a detection result of the other rangefinders;

[0030] The first driving member at the corresponding installation position of the target rangefinder is controlled according to the result difference, so that the movable template at the corresponding installation position approaches or moves away from the fixed template.

[0031] In one embodiment, the step of controlling the first driving member corresponding to the installation position of the target rangefinder according to the result difference includes the following specific steps:

[0032] If the result difference satisfies the following relationship: d 1 -d 2 <-e, control the driving force of the first driving member at the installation position corresponding to the target rangefinder to decrease until the detection result of the target rangefinder satisfies the following relationship: -e≤d 1 -d 2 ≤e;

[0033] If the result difference satisfies the following relationship: d 1 -d 2 >e, control the driving force of the first driving member at the installation position corresponding to the target rangefinder to increase until the detection result of the target rangefinder satisfies the following relationship: -e≤d 1 -d 2 ≤e;

[0034] Among them, d 1 is the detection result of the target range finder, d 2 is the detection result of other rangefinders except the target rangefinder, e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0035] In one embodiment, step S8 includes the following specific steps:

[0036] If the detection result of the rangefinder satisfies the following relationship: d<De, the driving force of the first driving member corresponding to the installation position of the rangefinder is controlled to decrease until the detection result of the rangefinder satisfies the following relationship: De≤d≤D+e;

[0037] If the detection result of the rangefinder satisfies the following relationship: d>D+e, controlling the driving force of the first driving member at the installation position corresponding to the rangefinder to increase until the detection result of the rangefinder satisfies the following relationship: De≤d≤D+e;

[0038] Wherein, d is the detection result of any distance meter, D is the opening and closing size of the mold, and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. The above-mentioned injection molding machine is provided with a clamping structure, including a fixed platen, a movable platen and a first driving member, wherein the fixed platen is used to fix the fixed mold, the movable platen is used to fix the movable mold, and the first driving member is used to make the movable platen bring the movable mold close to or away from the fixed mold to realize the injection molding and foaming compression processes of the product; in order to realize the precise movement of the movable mold and ensure that the movable mold and the fixed mold always maintain parallel movement, a plurality of rangefinders are installed on the mold, and the installation position of the rangefinder corresponds to the installation position of the first driving member. Therefore, when the first driving member on the movable platen moves, the rangefinder can accurately measure the distance change between the corresponding position of the first driving member on the movable mold, and the rangefinder feeds back the measurement result to the controller, and the controller controls the corresponding first driving member to adjust the moving speed and distance, so as to ensure that the measurement results between the plurality of rangefinders are consistent within a certain range, effectively improve the accuracy and parallelism of the movement of the movable mold, and ensure that the product thickness is more uniform and more accurate during the injection molding and foaming process.

[0041] 2. The distance meter includes a transmitter and a receiver. The transmitter and the receiver are respectively installed at the position where the movable mold and the fixed mold are parallel to the parting surface. The distance between the movable mold and the fixed mold is measured by the distance meter, which is to measure the distance between the movable mold parting surface and the fixed mold parting surface, which effectively improves the accuracy of the distance meter test results, so that the controller can control the parallelism more accurately.

[0042] 3. The first driving part uses a high-pressure oil cylinder to move the moving platen, which has a greater driving force and can be suitable for larger and heavier molds. At the same time, the controller can control the moving speed and distance of the high-pressure oil cylinder by controlling the flow and pressure of the proportional valve, making the control more precise.

[0043] 4. The second driving member is used to assist the first driving member in providing power to assist the movable mold plate in opening the mold. During the mold opening and foaming process, the movable mold plate is provided with a force opposite to that of the first driving member, that is, from the fixed mold direction toward the movable mold opening direction. Its auxiliary mold opening force tends to be constant. When the distance between the movable mold and the fixed mold is too large, the driving force of the first driving member becomes larger, and together they assist the movable mold plate in reducing the mold opening speed or making it relatively still. When the distance between the movable mold and the fixed mold is too small, the driving force of the first driving member becomes smaller, and together they increase the speed of the movable mold plate away from the fixed mold plate. This control method helps to make the precise mold opening process of the movable mold plate more stable and controllable. At the same time, the second driving member can also be activated or not through the controller, which effectively improves the degree of freedom of process programming and the accuracy and repeatability of the entire mold opening and foaming process.

[0044] 5. The injection molding machine is further provided with a retractable sealing frame, which can abut against the four sides of the foamed product, and is used to seal and shape the product when there is a gap between the movable mold and the fixed mold during the injection molding compression or mold opening foaming process. Since the sealing frame is retractable, for example, when the mold opening distance of the mold opening foaming product is too large or too small during process adjustment, the distance that the sealing frame extends out of the mold surface can change with the change of the mold opening distance, thereby avoiding glue overflow during the foaming process.

[0045] 6. The control method of the above-mentioned injection molding machine is suitable for changing the gap between molds or maintaining the gap between molds during the injection molding, compression or foaming process of the product. When changing the gap between the molds, the controller controls multiple first driving members by comparing the detection results between multiple distance meters, so that the detection results between the multiple distance meters remain dynamically consistent, thereby achieving the flatness between the movable mold and the fixed mold during the movement process; when maintaining the gap between the molds, the controller uses the preset mold opening and closing size as the standard, compares the detection results of the distance meter, and adjusts the driving force of the first driving member in real time, ensuring that the detection results of the multiple distance meters are dynamically consistent with the mold opening and closing size, thereby achieving a higher product thickness uniformity.

[0046] 7. When the control method performs zero-point calibration of the rangefinder, the calibration clamping force between the movable mold plate and the fixed mold plate is set to 50% of the maximum clamping force. At this time, the clamping force will not be too large to cause transitional extrusion and deformation between the movable mold and the fixed mold, and the clamping force will not be too small to cause excessive production gap between the movable mold and the fixed mold. This effectively improves the calibration accuracy and helps to improve product production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of an injection molding machine in one embodiment of the present invention.

[0048] Figure 2 Schematic diagram of the structure of a mold in one embodiment of the present invention.

[0049] Figure 3 FIG. 1 is a schematic diagram of the structure of a rangefinder in one embodiment of the present invention.

[0050] Figure 4 Schematic diagram of control of the mold clamping structure in one embodiment of the present invention.

[0051] Figure 5 It is a control schematic diagram of the mold clamping structure in the first embodiment of the present invention.

[0052] Figure 6 Schematic diagram of control of the mold clamping structure in the second embodiment of the present invention.

[0053] Figure 7 Schematic diagram of control of the mold clamping structure in the third embodiment of the present invention.

[0054] Figure 8 It is a schematic flow chart of the injection molding machine control method in the present invention.

[0055] Fig. 9 It is the test result curve of multiple distance meters in the control process of the injection molding machine in the present invention.

[0056] Fig.10 This is the thickness data of the foam layer of the product manufactured by the injection molding machine in the present invention.

[0057] : 100, injection molding machine; 10, clamping structure; 11, fixed mold plate; 12, movable mold plate; 13, first driving member; 131, high-pressure cylinder; 132, proportional valve; 133, hydraulic power source; 14, slide rail; 15, second driving member; 16, pull rod; 20, mold; 21, fixed mold; 22, movable mold; 30, rangefinder; 31, transmitter; 32, receiver; 33, first mounting member; 34, second mounting member; 40, equipment body; 41, robotic arm; 42, shooting platform; 43, back pressure assembly; 44, infrared heater; 50, controller. DETAILED DESCRIPTION

[0058] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0059] The following describes in detail an injection molding machine 100 with a mold parallelism control structure and a control method thereof in some embodiments with reference to the accompanying drawings.

[0060] like Figures 1 to 4 As shown, in one embodiment, an injection molding machine 100 having a mold parallelism control structure is provided, comprising a mold clamping structure 10, a mold 20, a plurality of distance meters 30 and a controller 50;

[0061] The mold clamping structure 10 includes a fixed mold plate 11, a movable mold plate 12 and a plurality of first driving members 13. The fixed mold plate 11 and the movable mold plate 12 are arranged opposite to each other. The plurality of first driving members 13 are arranged on the end surface of the movable mold plate 12 away from the fixed mold plate 11, and are used to drive the movable mold plate 12 to approach or move away from the fixed mold plate 11.

[0062] The mold 20 includes a fixed mold 21 and a movable mold 22, the movable mold 22 is connected to the movable mold plate 12, and the fixed mold 21 is connected to the fixed mold plate 11; the distance meter 30 is arranged on the mold 20, the distance meter 30 corresponds to the first driving member 13 one by one, and the installation position of the distance meter 30 corresponds to the installation position of the first driving member 13, and is used to detect the distance between the parting surface of the movable mold 22 and the parting surface of the fixed mold 21 at the corresponding installation position of the first driving member 13;

[0063] Furthermore, the controller 50 is electrically connected to the rangefinder 30 and the first driving member 13 , respectively. The controller 50 is used to control the first driving member 13 at the corresponding installation position according to the detection result of the rangefinder 30 .

[0064] The above-mentioned injection molding machine 100 is provided with a mold clamping structure 10, including a fixed mold plate 11, a movable mold plate 12 and a first driving member 13, wherein the fixed mold plate 11 is used to fix the fixed mold 21, the movable mold plate 12 is used to fix the movable mold 22, and the first driving member 13 is used to make the movable mold plate 12 bring the movable mold 22 close to or away from the fixed mold 21, so as to realize the injection compression and mold opening foaming processes of the product; in order to realize the precise movement of the movable mold 22 and ensure that the movable mold 22 and the fixed mold 21 always maintain parallel movement, a plurality of rangefinders 30 are installed on the mold 20, and the installation position of the rangefinder 30 is The position corresponds to the installation position of the first driving member 13. Therefore, when the first driving member 13 on the movable mold plate 12 moves, the rangefinder 30 can accurately measure the distance change of the position corresponding to the first driving member 13 on the movable mold 22. The rangefinder 30 feeds back the measurement result to the controller 50, and the controller 50 controls the corresponding first driving member 13 to adjust the moving speed and distance, so as to ensure that the measurement results between the multiple rangefinders 30 are consistent within a certain range, effectively improve the accuracy and parallelism of the movement of the movable mold 22, and ensure that the product thickness is more uniform and more accurate during the injection molding and foaming process.

[0065] Specifically, Figure 2 and Figure 3 As shown, in one embodiment, the rangefinder 30 includes a transmitter 31 and a receiver 32, the transmitter 31 is arranged on the fixed mold 21 or the movable mold 22, and the receiver 32 is correspondingly arranged on the movable mold 22 or the fixed mold 21, the transmitter 31 and the receiver 32 are arranged opposite to each other, and the receiver 32 is used to receive the signal transmitted by the transmitter 31; the installation position of the transmitter 31 is parallel to the parting surface of the fixed mold 21 or the movable mold 22, and the installation position of the receiver 32 is correspondingly parallel to the parting surface of the movable mold 22 or the fixed mold 21.

[0066] Among them, the rangefinder 30 includes a transmitter 31 and a receiver 32, and the transmitter 31 and the receiver 32 are respectively installed at the positions where the movable mold 22 and the fixed mold 21 are parallel to the parting surface. The distance between the movable mold 22 and the fixed mold 21 measured by the rangefinder 30 is to measure the distance between the parting surface of the movable mold 22 and the parting surface of the fixed mold 21, which effectively improves the accuracy of the test result of the rangefinder 30, so that the controller 50 can control the parallelism more accurately.

[0067] Furthermore, in one embodiment, a first mounting member 33 is provided on the transmitter 31 , and the first mounting member 33 is connected to the fixed mold 21 or the movable mold 22 . A second mounting member 34 is provided on the receiver 32 , and the second mounting member 34 is correspondingly connected to the movable mold 22 or the fixed mold 21 .

[0068] In this specific embodiment, the first mounting member 33 is mounted on the movable mold 22 , and the second mounting member 34 is mounted on the fixed mold 21 , that is, the transmitter 31 is mounted on the movable mold 22 , and the receiver 32 is mounted on the fixed mold 21 .

[0069] In this specific embodiment, the rangefinder 30 includes a magnetic induction electronic ruler, the transmitter is an induction magnetic block, the receiver receives the position information of the induction magnetic block and converts the magnetic signal into distance information, and then transmits the distance information to the controller 50, with an accuracy of 0.01mm.

[0070] Furthermore, in one embodiment, four first driving members 13 are provided, which are respectively arranged at four corner areas of the end surface of the movable template 12 away from the fixed template 11, and four distance meters 30 are provided. The distance meters 30 and the first driving members 13 at the corresponding installation positions are arranged colinearly along the direction in which the fixed template 11 and the movable template 12 are relatively arranged.

[0071] Specifically, Figure 1 and Figure 4 As shown, in one embodiment, the first driving member 13 includes a high-pressure cylinder 131, a proportional valve 132 and a hydraulic power source 133. The high-pressure cylinder 131 is connected to the end surface of the movable template 12 away from the fixed template 11. The proportional valve 132 is respectively connected to the high-pressure cylinder 131 and the hydraulic power source 133. The controller 50 is connected to the proportional valve 132 for controlling the flow and pressure of the proportional valve 132 according to the detection result of the rangefinder 30.

[0072] During the injection compression or mold opening and foaming processes, the first driving member 13 uses a high-pressure cylinder 131 to move the movable template 12, which has a greater driving force and can be suitable for larger and heavier molds 20. At the same time, the controller 50 can control the moving speed and distance of the high-pressure cylinder 131 by controlling the flow and pressure of the proportional valve 132, and the control is more precise.

[0073] In this specific embodiment, a valve block is provided between the high-pressure oil cylinder 131 and the proportional valve 132 , and a high-pressure valve block is provided between the proportional valve 132 and the hydraulic power source 133 .

[0074] Among them, the injection molding machine 100 is a horizontal injection molding machine 100, and the mold closing structure 10 of the injection molding machine 100 also includes a slide rail 14, the fixed mold plate 11 is fixedly connected to the slide rail 14, the movable mold plate 12 is slidably connected to the slide rail 14, the fixed mold plate 11 and the movable mold plate 12 are arranged opposite to each other in the horizontal direction, and a plurality of pull rods 16 are arranged between the fixed mold plate 11 and the movable mold plate 12, and the pull rods 16 pass through the fixed mold plate 11 and the movable mold plate 12 in sequence, and the movable mold plate 12 can slide along the pull rods 16.

[0075] like Figure 6 As shown, the mold clamping structure 10 further includes an intermediate mold plate, which is located between the fixed mold plate and the movable mold plate, the movable mold plate and the fixed mold plate are respectively provided with a first mold and a second mold, and the two sides of the intermediate mold plate are respectively provided with a third mold and a fourth mold, and the intermediate mold plate can rotate around a vertical axis, so that the mold clamping structure 10 has a first mold clamping state and a second mold clamping state;

[0076] In the first mold-closing state, the first mold is molded with the third mold, and the second mold is molded with the fourth mold; in the second mold-closing state, the first mold is molded with the fourth mold, and the second mold is molded with the third mold. The third mold and the fourth mold of the intermediate template are respectively provided with a first transmitter and a second transmitter, and the first mold on the movable template 12 and the second mold on the fixed template 11 are respectively provided with a first receiver and a second receiver corresponding thereto. In the first mold-closing state, the first receiver and the first transmitter form a first rangefinder, and the second receiver and the second transmitter form a second rangefinder; in the second mold-closing state, the first receiver and the second transmitter form a first rangefinder, and the second receiver and the first transmitter form a second rangefinder;

[0077] Furthermore, if Figure 1 and Figure 4 As shown, in one embodiment, the injection molding machine 100 further includes a second driving member 15 , which is disposed on the end surface of the movable platen 12 close to the fixed platen 11 and is used to drive the movable platen 12 to approach or move away from the fixed platen 11 .

[0078] In this specific embodiment, the second driving member 15 includes a hydraulic cylinder and a piston of sufficient length. The hydraulic cylinder is fixed on the fixed mold plate 11 , one end of the piston of sufficient length extends into the hydraulic cylinder, and the other end of the piston is connected to the movable mold plate 12 .

[0079] The second driving member 15 is connected to the controller 50, and the controller 50 is used to control the opening and closing of the second driving member 15 in the injection compression or mold opening foaming process.

[0080] The second driving member 15 is used to assist the first driving member 13 in providing power to assist the movable mold plate 12 in opening the mold, and provides the movable mold plate 12 with a force opposite to the first driving member 13, that is, from the fixed mold direction toward the movable mold opening direction, and its auxiliary mold opening force tends to be constant. When the distance between the movable mold 22 and the fixed mold 21 is too large, the driving force of the first driving member 13 becomes larger, and together they assist the movable mold plate 12 in reducing the mold opening speed or making it relatively still. When the distance between the movable mold 22 and the fixed mold 21 is too small, the driving force of the first driving member 13 becomes smaller, and together they increase the speed of the movable mold plate 12 and move away from the fixed mold plate 11. This control method helps to make the precise mold opening process of the movable mold plate 12 more stable and controllable. At the same time, the second driving member 15 can also be activated or not through the controller 50, which effectively improves the degree of freedom of process programming and the accuracy and repeatability of the entire mold opening and foaming process. Specifically, in one embodiment, the injection molding machine 100 also includes a sealing frame and a telescopic drive component. The sealing frame is arranged around the injection molded foam product and is used to abut against the injection molded foam product on all sides. The telescopic drive component is connected to the sealing frame and is used to change the distance that the sealing frame extends out of the mold surface.

[0081] In addition, the sealing frame includes multiple different sections to adapt to different circumferential shapes of products. Each section has an independent cooling water channel to prevent it from being stuck due to thermal expansion after continuous contact with high-temperature plastic melt. Each section is mechanically connected as a whole and connected to the telescopic drive component to control the distance and force of the sealing frame from the mold surface. In addition, the controller can be connected to the telescopic drive component to control the hydraulic pressure and flow of the telescopic drive component.

[0082] The injection molding machine is further provided with a retractable sealing frame, which can abut against the four sides of the foamed product and is used to seal the foamed product in the sealing surface direction of the mold during the mold opening and foaming process. Since the sealing frame is retractable and set through the controller, overflow of glue is avoided during the foaming process.

[0083] The injection molding machine 100 is further provided with a retractable sealing frame, which can abut against the four sides of the foamed product, and is used for sealing and shaping the product in the mold 20 with a mold opening gap during the injection molding compression or mold opening foaming process. Since the sealing frame is retractable, when the mold opening distance of the mold opening foaming product is too large or too small during process adjustment, the distance that the sealing frame extends out of the mold surface can change with the change of the mold opening distance, thereby avoiding glue overflow during the foaming process.

[0084] Specifically, Figure 5 , Figure 6 and Figure 7 As shown, in one embodiment, the injection molding machine 100 includes a shooting platform 42 and a back pressure assembly 43. The fixed mold 21 is provided with an injection hole, the shooting platform 42 is connected to the injection hole, and the back pressure assembly 43 is used to drive the shooting platform 42 to inject molten material.

[0085] Furthermore, two shooting platforms 42 are provided, and the two shooting platforms 42 are distributed on both sides of the clamping structure 10. The first shooting platform 42 is connected to the fixed mold 21 for injecting the main material of the product, and the other shooting platform 42 is connected to the movable mold 22 for injecting the foaming material of the product.

[0086] In this specific embodiment, it also includes an infrared heater 44 and a robotic arm 41. The infrared heater 44 is used to heat the thermoplastic organic sheet (such as glass fiber fabric reinforced polypropylene, with a fiber content of 47%). The robotic arm 41 is used to support and move the organic fiber board, and move the organic fiber board from the assembly line to the infrared heater 44. After the heating in the infrared heater 44 is completed, the robotic arm 41 moves the organic fiber board from the infrared heater 44 to the mold 20.

[0087] The robot arm 41 may be a six-axis robot arm 41 and a clamping member connected thereto in conventional technology. The six-axis robot arm 41 is used to improve the mobility, and the clamping member is used to clamp the heated thermoplastic organic sheet.

[0088] Therefore, the injection molding machine 100 can integrate multiple processes of product processing on the same device. The specific processing flow is as follows:

[0089] The robot arm 41 places the thermoplastic organic sheet into the infrared heating station for heating, and after the sheet reaches the preset temperature, it is sent into the mold 20. The thermoplastic organic sheet is used to locally strengthen the product;

[0090] Close the mold 20 and set the clamping force;

[0091] The first injection station 42 injects component 1 (such as unfoamed TPE material) and cools it for a certain period of time;

[0092] The second injection station 42 injects component 2 (such as physically foamed PP+TV20 material);

[0093] The mold 20 is slightly opened for mold opening and foaming, and the controller 50 controls the first driving member 13 according to the distance meter 30 to keep the movable mold 22 parallel to the fixed mold 21;

[0094] After the mold is opened and foamed, the injection molded product is obtained after cooling for a certain period of time;

[0095] The mold 20 is opened, and the robot arm 41 takes out the injection molded product.

[0096] The injection molded product is finally composed of component 1 (such as unfoamed TPE material) and component 2 (such as physically foamed PP+TV20 material). Thermoplastic organic sheets are set in some areas for reinforcement. During the mold opening and foaming process, the controller 50 always keeps the movable mold 22 and the fixed mold 21 parallel, and the thickness difference of the final injection molded product is kept within ±0.1mm (such as Fig. 9At the same time, by measuring the thickness of the same key area of ​​each mold product, the thickness repeatability deviation is kept within ±0.1mm (as shown in Fig.10 ) effectively improves the quality and thickness uniformity of injection molded products and reduces the weight of injection molded products.

[0097] like Figure 8 As shown, in one embodiment, a control method of an injection molding machine 100 is provided, which is applicable to the above-mentioned injection molding machine 100 and includes the following steps:

[0098] S1: Perform zero point calibration on multiple rangefinders 30;

[0099] S2: Preset the opening and closing size of the mold 20;

[0100] S3: Control the first driving member 13 so that the movable platen 12 moves closer to or away from the fixed platen 11;

[0101] S4: Acquire detection results of multiple rangefinders 30 during the movement of the movable template 12;

[0102] S5: controlling the plurality of first driving members 13 so that the detection results of the plurality of rangefinders 30 are consistent;

[0103] S6: When the detection results of the multiple distance meters 30 reach the opening and closing size, the first driving member 13 is controlled so that the movable plate 12 and the fixed plate 11 remain relatively still;

[0104] S7: while the moving template 12 is stationary, obtaining detection results of multiple rangefinders 30;

[0105] S8: Control the plurality of first driving members 13 so that the detection results of the plurality of distance meters 30 are consistent with the opening and closing size.

[0106] like Fig. 9 As shown, the control method of the injection molding machine 100 is suitable for changing the gap between the molds 20 or maintaining the gap between the molds 20 during the injection molding and compression or mold opening and foaming process of the product. When changing the gap between the molds 20, the controller 50 controls the multiple first driving members 13 by comparing the detection results between the multiple distance meters 30, so that the detection results between the multiple distance meters 30 remain dynamically consistent, thereby achieving the flatness between the movable mold 22 and the fixed mold 21 during the movement process; when maintaining the gap between the molds 20, the controller 50 uses the preset mold 20 opening and closing size as the standard, compares the detection results of the distance meter 30, and adjusts the driving force of the first driving member 13 in real time, ensuring that the detection results of the multiple distance meters 30 are dynamically consistent with the mold 20 opening and closing size, thereby achieving a higher product thickness uniformity.

[0107] Specifically, the control method is applied to the injection compression or mold opening foaming process of the product, and includes the following specific steps:

[0108] Performing zero point calibration on a plurality of rangefinders 30;

[0109] Preset the opening and closing dimensions of the mold 20;

[0110] Controlling the first driving member 13 so that the movable platen 12 moves away from the fixed platen 11 at a uniform speed;

[0111] During the movement of the movable template 12, the detection results of the multiple rangefinders 30 are obtained;

[0112] Controlling the plurality of first driving members 13 so that the detection results of the plurality of rangefinders 30 are consistent;

[0113] When the detection results of the multiple distance meters 30 reach the opening and closing size, the first driving member 13 is controlled so that the movable plate 12 and the fixed plate 11 remain relatively still;

[0114] When the moving template 12 is stationary, the detection results of the multiple rangefinders 30 are obtained;

[0115] The plurality of first driving members 13 are controlled so that the detection results of the plurality of distance meters 30 are consistent with the opening and closing size.

[0116] In one embodiment, in step S1, the following steps are included:

[0117] Control the first driving member 13 so that the movable platen 12 moves close to the fixed platen 11 and enters a mold clamping calibration state, wherein the calibration mold clamping force between the movable platen 12 and the fixed platen 11 is 50% of the maximum mold clamping force;

[0118] In the mold clamping calibration state, a plurality of distance meters 30 are subjected to zero point calibration.

[0119] When the control method performs zero-point calibration of the rangefinder 30, the calibration clamping force between the movable mold plate 12 and the fixed mold plate 11 is set to 50% of the maximum clamping force. At this time, the clamping force will not be too large to cause transitional extrusion and deformation between the movable mold 22 and the fixed mold 21, and the clamping force will not be too small to cause excessive gap between the movable mold 22 and the fixed mold 21, which effectively improves the calibration accuracy and helps to improve product production quality.

[0120] In one embodiment, in step S5, the following specific steps are included:

[0121] Select any one of the rangefinders 30 as the target rangefinder 30, and the rangefinders 30 other than the target rangefinder 30 as other rangefinders 30, and obtain the difference between the detection result of the target rangefinder 30 and the detection result of the other rangefinders 30;

[0122] The first driving member 13 at the corresponding installation position of the target distance meter 30 is controlled according to the result difference, so that the movable platen 12 at the corresponding installation position approaches or moves away from the fixed platen 11 .

[0123] In one embodiment, the step of controlling the first driving member 13 of the target rangefinder 30 corresponding to the installation position according to the result difference includes the following specific steps:

[0124] If the result difference satisfies the following relationship: d 1 -d 2 <-e, the driving force of the first driving member 13 at the corresponding installation position of the target rangefinder 30 is controlled to decrease until the detection result of the target rangefinder 30 satisfies the following relationship: -e≤d 1 -d 2 ≤e;

[0125] If the result difference satisfies the following relationship: d 1 -d 2 >e, the driving force of the first driving member 13 corresponding to the installation position of the target rangefinder 30 is controlled to increase until the detection result of the target rangefinder 30 satisfies the following relationship: -e≤d 1 -d 2 ≤e;

[0126] Among them, d 1 is the detection result of the target range finder 30, d 2 is the detection result of other rangefinders 30 except the target rangefinder 30, e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0127] In one embodiment, in step S8, the following specific steps are included:

[0128] If the detection result of the rangefinder 30 satisfies the following relationship: d<De, the driving force of the first driving member 13 corresponding to the installation position of the rangefinder 30 is controlled to decrease until the detection result of the rangefinder 30 satisfies the following relationship: De≤d≤D+e;

[0129] If the detection result of the rangefinder 30 satisfies the following relationship: d>D+e, the driving force of the first driving member 13 corresponding to the installation position of the rangefinder 30 is controlled to increase until the detection result of the rangefinder 30 satisfies the following relationship: De≤d≤D+e;

[0130] Wherein, d is the detection result of any distance meter 30, D is the opening and closing size of the mold 20, and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0131] In one embodiment, in step S1, the mold clamping structure 10 further includes an intermediate mold plate, a first mold plate and a second mold plate are respectively provided on the movable mold plate and the fixed mold plate, a third mold plate and a fourth mold plate are respectively provided on both sides of the intermediate mold plate, a first transmitter and a second transmitter are respectively provided on the third mold plate and the fourth mold plate, a first receiver and a second receiver are respectively provided on the first mold plate and the second mold plate, in the first mold clamping state, the first receiver and the first transmitter form a first rangefinder, and the second receiver and the second transmitter form a second rangefinder; in the second mold clamping state, the first receiver and the second transmitter form a first rangefinder, and the second receiver and the first transmitter form a second rangefinder; and further comprising the following steps:

[0132] Determine the clamping state of the clamping structure 10;

[0133] Select the first distance meter or the second distance meter as the distance meter to be used 30 according to the mold closing state;

[0134] The distance meter 30 to be used is subjected to zero-point calibration.

[0135] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0136] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0137] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0138] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0139] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0140] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An injection molding machine with a mold parallelism control structure, characterized in that: include: A mold clamping structure (10), the mold clamping structure (10) comprising a fixed mold plate (11), a movable mold plate (12) and a plurality of first driving members (13), the fixed mold plate (11) and the movable mold plate (12) being arranged opposite to each other, the plurality of first driving members (13) being arranged on an end surface of the movable mold plate (12) away from the fixed mold plate (11) and being used to drive the movable mold plate (12) to approach or move away from the fixed mold plate (11); A mold (20), the mold (20) comprising a fixed mold (21) and a movable mold (22), the movable mold (22) being connected to the movable mold plate (12), and the fixed mold (21) being connected to the fixed mold plate (11); a plurality of distance meters (30), the distance meters (30) being arranged on the mold (20), the distance meters (30) corresponding to the first driving members (13) one by one, and the installation positions of the distance meters (30) corresponding to the installation positions of the first driving members (13), and being used to detect the distance between the parting surface of the movable mold (22) and the parting surface of the fixed mold (21) at the corresponding installation positions of the first driving members (13); A controller (50), the controller (50) being electrically connected to the distance meter (30) and the first driving member (13) respectively, and the controller (50) being used to control the first driving member (13) at a corresponding installation position according to a detection result of the distance meter (30).

2. The injection molding machine with a mold parallelism control structure according to claim 1, characterized in that: The rangefinder (30) comprises a transmitter (31) and a receiver (32); the transmitter (31) is arranged on the fixed mold (21) or the movable mold (22); the receiver (32) is correspondingly arranged on the movable mold (22) or the fixed mold (21); the transmitter (31) and the receiver (32) are arranged opposite to each other; the receiver (32) is used to receive a signal transmitted by the transmitter (31); the installation position of the transmitter (31) is parallel to the parting surface of the fixed mold (21) or the movable mold (22); the installation position of the receiver (32) is correspondingly parallel to the parting surface of the movable mold (22) or the fixed mold (21).

3. The injection molding machine with a mold parallelism control structure according to claim 1, characterized in that: The first driving member (13) comprises a high-pressure oil cylinder (131), a proportional valve (132) and a hydraulic power source (133); the high-pressure oil cylinder (131) is connected to the end surface of the movable platen (12) away from the fixed platen (11); the proportional valve (132) is respectively connected to the high-pressure oil cylinder (131) and the hydraulic power source (133); the controller (50) is connected to the proportional valve (132) and is used to control the flow and pressure of the proportional valve (132) according to the detection result of the distance meter (30).

4. The injection molding machine with a mold parallelism control structure according to claim 1, characterized in that: The injection molding machine further comprises a second driving member (15), which is arranged on the end surface of the movable platen (12) close to the fixed platen (11) and is used to drive the movable platen (12) to approach or move away from the fixed platen (11).

5. The injection molding machine with a mold parallelism control structure according to claim 1, characterized in that: The injection molding machine also includes a sealing frame and a telescopic driving member. The sealing frame is arranged around the injection molded foam product and is used to abut against the four sides of the injection molded foam product. The telescopic driving member is connected to the sealing frame and is used to change the distance that the sealing frame is pushed out or retracted from the mold surface.

6. A control method for an injection molding machine, applicable to the injection molding machine according to any one of claims 1 to 5, characterized in that: The steps include: S1: performing zero point calibration on a plurality of rangefinders (30); S2: preset the opening and closing dimensions of the mold (20); S3: controlling the first driving member (13) so that the movable platen (12) moves closer to or farther from the fixed platen (11); S4: during the movement of the movable template (12), obtaining detection results of a plurality of the rangefinders (30); S5: controlling the plurality of first driving members (13) so that the detection results of the plurality of rangefinders (30) are consistent; S6: When the detection results of the plurality of distance meters (30) reach the opening and closing size, the first driving member (13) is controlled so that the movable plate (12) and the fixed plate (11) remain relatively still; S7: while the moving template (12) is stationary, obtaining detection results of a plurality of rangefinders (30); S8: Controlling the plurality of first driving members (13) so that the detection results of the plurality of distance meters (30) are consistent with the opening and closing size.

7. The control method of an injection molding machine according to claim 6, characterized in that: In step S1, the following steps are included: Controlling the first driving member (13) so that the movable mold plate (12) moves close to the fixed mold plate (11) to enter a mold clamping calibration state, wherein the calibration mold clamping force of the first driving member (13) is 50% of the maximum mold clamping force; In the mold closing calibration state, a plurality of distance meters (30) are subjected to zero point calibration.

8. The control method of an injection molding machine according to claim 6, characterized in that: In the step S5, the following specific steps are included: Selecting any one of the rangefinders (30) as a target rangefinder (30), and rangefinders (30) other than the target rangefinder (30) as other rangefinders (30), and obtaining a result difference between a detection result of the target rangefinder (30) and a detection result of the other rangefinders (30); The first driving member (13) at the corresponding installation position of the target distance meter (30) is controlled according to the result difference, so that the movable plate (12) at the corresponding installation position approaches or moves away from the fixed plate (11).

9. The control method of an injection molding machine according to claim 8, characterized in that: In the step of controlling the first driving member (13) corresponding to the installation position of the target rangefinder (30) according to the result difference, the following specific steps are included: If the result difference satisfies the following relationship: d1-d2<-e, the driving force of the first driving member (13) corresponding to the installation position of the target distance meter (30) is controlled to decrease until the detection result of the target distance meter (30) satisfies the following relationship: -e≤d1-d2≤e; If the result difference satisfies the following relationship: d1-d2>e, the driving force of the first driving member (13) corresponding to the installation position of the target distance meter (30) is controlled to increase until the detection result of the target distance meter (30) satisfies the following relationship: -e≤d1-d2≤e; Wherein, d1 is the detection result of the target distance meter (30), d2 is the detection result of other distance meters (30) except the target distance meter (30), and e is the allowable thickness deviation of the product, where -0.1≤e≤0.

1.

10. The control method of an injection molding machine according to claim 6, characterized in that: In the step S8, the following specific steps are included: If the detection result of the distance meter (30) satisfies the following relationship: d<De, the driving force of the first driving member (13) corresponding to the installation position of the distance meter (30) is controlled to decrease until the detection result of the distance meter (30) satisfies the following relationship: De≤d≤D+e; If the detection result of the rangefinder (30) satisfies the following relationship: d>D+e, the driving force of the first driving member (13) corresponding to the installation position of the rangefinder (30) is controlled to increase until the detection result of the rangefinder (30) satisfies the following relationship: De≤d≤D+e; Wherein, d is the detection result of any distance meter (30), D is the opening and closing size of the mold (20), and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

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