INJECTION POURING MACHINE AND INJECTION POURING SYSTEM

Abstract

One task is to enable an injection molding machine (10) having a screw-type cylinder to continuously receive a resin serving as a molding material. An injection molding machine (10) includes a plasticizing cylinder (12) that continuously receives resin from a receiving section (121) into an interior, conveys the resin forward by rotating a screw (122), and discharges the conveyed resin outwards by moving the screw (122) forward, whereby, even as the screw (122) is moved forward, it rotates in the same direction as when the resin is conveyed.

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] The present invention relates to an injection molding machine and an injection molding system.

[0002] This application claims priority from Japanese patent application No. 2024-152368, filed on September 4, 2024, which is incorporated herein in its entirety by reference. Description of the state of the art

[0003] A dispensing unit that decontaminates impurities contained within a resin to be recycled and dispenses the resin as molten resin, and an injection molding machine that receives a supply of the dispensed molten resin and performs the injection molding, can be connected by a pipe (for example, International Publication No. 2022 / 056618). In such an injection molding machine, there is a cylinder equipped with a screw-type cylinder that receives resin from a receiving section of the dispensing unit, rotates an internally mounted screw to feed the resin forward, and dispenses the resin to the outside by moving the screw forward. In such a screw-type cylinder, the rotation of the screw stops when the screw is moved forward. SUMMARY OF THE INVENTION

[0004] When the rotation of the screw, mounted inside the cylinder of the screw type, stops, the flow of resin within the cylinder ceases, and the resin remains contained within the cylinder. In this case, if the dispensing unit continuously discharges the resin, the pressure exerted on the receiving section of the cylinder, which receives the resin dispensed by the unit, increases. If an attempt is made to convey a quantity of resin exceeding the amount that the cylinder can hold, a situation may arise where molten resin leaks from a gap in the cylinder.

[0005] One object of the present invention is to enable an injection molding machine having a screw-type cylinder to continuously receive a resin serving as a molding material.

[0006] An injection molding machine of the present invention, designed for such a task, comprises a plasticizing cylinder which continuously receives a resin from a receiving section into an interior, conveys the resin forward by rotating a screw, and discharges the conveyed resin to the outside by moving the screw forward, wherein, even when the screw is moved forward, the screw is rotated in the same direction as when the resin is conveyed forward.

[0007] The injection molding machine may also contain screw control devices for controlling the speed of the screw.

[0008] Furthermore, the screw control device can control the screw speed so that the screw speed when the resin is dispensed is essentially the same as the screw speed when a predetermined amount of resin is dosed.

[0009] Furthermore, the screw control device can change the screw speed in response to a change in the amount of resin received in the plasticizing cylinder and control the screw speed so that the amount of resin dispensed from the plasticizing cylinder is essentially the same as the amount of resin received.

[0010] Furthermore, the injection molding machine may also include pressure measuring means for measuring a pressure exerted on the receiving section of the resin, wherein the screw control means can control the rotational speed of the screw in response to a magnitude of the measured pressure.

[0011] Furthermore, the screw control device can perform control to increase the rotational speed when the magnitude of the measured pressure is greater than a predetermined value, and control to reduce the rotational speed when the magnitude of the measured pressure is less than the predetermined value.

[0012] Furthermore, an injection molding system of the present invention, completed for such a purpose, comprises a dispensing unit that dispenses a resin, and an injection molding machine that receives the dispensed resin, plasticizes and melts the resin, injects the resin into a mold, and forms the resin with the mold, wherein the injection molding machine includes a plasticizing cylinder that continuously receives the resin from a receiving section into an interior, conveys the resin forward by rotating a screw, and discharges the conveyed resin outwards by moving the screw forward, and even when the screw is moved forward, the screw is rotated in the same direction as when the resin is conveyed forward.

[0013] According to the present invention, the injection molding machine with the screw-type cylinder can continuously receive the resin serving as the molding material. BRIEF DESCRIPTION OF THE FIGURES Fig. Figure 1 is a diagram that shows an example of an overall configuration of an injection molding system according to the present embodiment. Fig. 2 is a graph showing the time course of the control of a worm by a worm control unit of Fig. 1 represents. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention is described in detail below with reference to the accompanying drawings. <Konfiguration von Spritzgießsystem 1>

[0015] Fig. Figure 1 is a diagram that shows an example of an overall configuration of an injection molding system 1 according to the present embodiment.

[0016] The in Fig. The injection molding system 1 shown in Figure 1 is a system configured to include an injection molding machine 10, which performs injection molding of a molded product using a resin as the material; a dispensing unit 20, which continuously dispenses the resin to the injection molding machine 10; and a connecting pipe 30, which connects the dispensing unit 20 and the injection molding machine 10. In injection molding system 1, since the resin serving as the molding material is dispensed from the dispensing unit 20 to the injection molding machine 10, the injection molding machine 10, when viewed from the dispensing unit 20, is a unit located on the downstream side.

[0017] The injection molding machine 10 and the dispensing unit 20 are connected by the connecting pipe 30. The connecting pipe 30 is a metal pipe with a curved section, and a chamber 31, which serves as a flow path through which the resin dispensed by the dispensing unit 20 flows, is formed within it. Therefore, the connecting pipe 30 has heat and pressure resistance to cause the resin to flow. Furthermore, an inner surface of the connecting pipe 30 is smooth and has a non-retaining structure, making resin retention unlikely. The connecting pipe 30 has an upstream end section connected to the dispensing unit 20 and a downstream end section connected to the injection molding machine 10. Therefore, as indicated by an arrow in Fig. Figure 1 shows the resin dispensed by the output unit 20 being received in the injection molding machine 10 after flowing through the connecting tube 30. In this embodiment, the resin dispensed from the output unit 20 can be a molten resin, which is a fluid, or it can be a solid resin that is pulverized into a chip shape and is referred to as a pellet. [Injection molding machine 10]

[0018] As described above, the injection molding machine 10 is a molding machine used to produce a molded product using resin as the material. The injection molding machine 10 is connected to the output unit 20 via the connecting pipe 30. Therefore, the injection molding machine 10 receives the resin dispensed by the output unit 20 via the connecting pipe 30 and enables the production of the molded product using the received resin as the material. The injection molding machine 10 includes an injection unit 11 and a mold 50. (Injection unit 11)

[0019] The injection unit 11 is a unit that plasticizes a resin, which is a molding material, meters the resin in a molten state, and injects a predetermined quantity of resin into the interior of the mold 50. The injection unit 11 comprises a plasticizing cylinder 12, which plasticizes and meters the resin, and an injection cylinder 13, which receives the resin dispensed by the plasticizing cylinder 12 and injects the resin into the interior of the mold 50.

[0020] The plasticizing cylinder 12 contains a receiving section 121 for receiving the resin. The receiving section 121 is arranged on the upstream side in a centerline direction within the plasticizing cylinder 12 and receives the resin flowing through the connecting tube 30 inside the plasticizing cylinder 12. The end section of the connecting tube 30 and a hole provided in the plasticizing cylinder 12 are connected in the receiving section 121.

[0021] The receiving section 121 only needs to receive the resin flowing through the connecting tube 30 inside the plasticizing cylinder 12, and thus the configuration is not particularly restricted. For example, the end section of the connecting tube 30 and the receiving section 121 of the plasticizing cylinder 12 can be connected using a connecting element, such as a coupling (not shown). Alternatively, for example, the end section of the connecting tube 30 and the receiving section 121 of the plasticizing cylinder 12 can be joined by welding.

[0022] Furthermore, the plasticizing cylinder 12 contains a screw 122. The screw 122 rotates to convey the resin forward (downstream in the direction of the center axis). In this case, a metering zone 126 of the plasticizing cylinder 12 meters the resin conveyed forward by the rotation of the screw 122. As a result, a predetermined quantity of resin is conveyed forward in the plasticizing cylinder 12. When a predetermined quantity of resin has accumulated in the vicinity of a discharge port 124 in the plasticizing cylinder 12, the screw 122 moves forward in the centerline direction toward the downstream side. Then, the resin accumulated near the discharge port 124 is pressurized by a tip section 123 of the screw 122 and discharged outward from the discharge port 124.

[0023] The screw 122 in the plasticizing cylinder 12 is controlled by a screw control unit 125. For example, the screw control unit 125 enables control of the screw rotation, control of movement (forward movement, reverse movement) in the centerline direction, and the like. The control of the screw 122 by the screw control unit 125 will be described in detail later.

[0024] Furthermore, the plasticizing cylinder 12 contains a belt heater 127, which plasticizes the plasticizing cylinder 12. The belt heater 127 is configured, for example, to include a cylindrical heater that is lightweight and thin, in which nichrome wire is insulated with a heat-resistant mica plate and covered externally with a stainless steel plate, and is arranged on an outer circumferential surface of the plasticizing cylinder 12. Therefore, the plasticizing cylinder 12 plasticizes the resin inside using the heat emitted by the belt heater 127.

[0025] Furthermore, the plasticizing cylinder 12 contains a pressure measuring unit 128 as a pressure measuring device for measuring the pressure exerted on the receiving section 121 of the resin dispensed by the output unit 20. The pressure measuring unit 128 is configured to include a pressure gauge or pressure sensor. The magnitude of the pressure measured by the pressure measuring unit 128 is used, for example, as information for the screw control unit 125 to control the screw rotation of the screw 122. The quantity of resin received in the plasticizing cylinder 12 can also be estimated based on the magnitude of the pressure measured by the pressure measuring unit 128.

[0026] A tube 129 for causing the resin dispensed by the plasticizing cylinder 12 to flow is arranged at an end section on the downstream side in the centerline direction of the plasticizing cylinder 12. The tube 129 is a metal tube with a curved section, and a chamber 130, which serves as a flow path through which the resin dispensed by the plasticizing cylinder 12 flows, is formed within it. Therefore, the tube 129 exhibits heat and pressure resistance to cause the resin to flow. Furthermore, an inner surface of the tube 129 is smooth and has a non-retaining structure, making it unlikely that the resin will be retained.

[0027] The injection cylinder 13 receives the resin conveyed into its interior from the plasticizing cylinder 12 via the pipe 129. A plunger piston 131, located inside the injection cylinder 13, moves in the centerline direction towards the downstream side to pressurize the resin filled into the injection cylinder 13. As a result, the pressurized resin is injected outwards from an injection port 132. In particular, as indicated by an arrow in Fig. Figure 1 shows the resin being injected in a state in which the injection port 132 of the injection cylinder 13 is in contact with the mold 50. (Form 50)

[0028] The mold 50 includes an injection frame 51, which is a flow path into which the resin injected from the injection cylinder 13 flows, and an inlet 52 of the injection frame 51. When the resin is injected from the injection port 132 in a state where the injection port 132 of the injection cylinder 13 and the injection port 52 of the injection frame 51 are in contact, the injected resin flows through the injection frame 51 and into the interior of the mold 50. The mold 50 completes a molded product (for example, a product or a preform of the product) by forming a resin that flows into the interior through a mold opening and closing operation, and by cooling and solidifying the resin. The mold opening and closing operation of the mold 50 is performed by a mold clamping unit (not shown). [Output unit 20]

[0029] As described above, the output unit 20 is a unit that dispenses the resin to the injection molding machine 10. For example, the output unit 20 could be a unit that decontaminates impurities contained within the resin of a PET bottle or the like, which is to be recycled using a process such as mechanical recycling (physical regeneration process) or chemical recycling (chemical regeneration process), and dispenses the decontaminated resin as molten resin. The output unit 20 is connected to the connecting pipe 30. Therefore, the resin dispensed by the output unit 20 is received via the connecting pipe 30 in the plasticizing cylinder 12 of the injection unit 11 of the injection molding machine 10.

[0030] Here, "mechanical recycling" refers to a series of treatments, such as molten resin (e.g., from a recovered used PET bottle) by exposing the resin to high temperatures and diffusing and decontaminating impurities within the resin under vacuum in output unit 20. "Chemical recycling," on the other hand, refers to a series of treatments involving sorting, decomposing, and repolymerizing resin (e.g., from a recovered used PET bottle) to decontaminate it. <Steuerung von Schnecke 122>

[0031] As described above, the plasticizing cylinder 12, which forms the injection unit 11 of the injection molding machine 10, conveys the resin received into the interior through the receiving section 121 by the rotation of the screw 122 (downstream in the centerline direction) while the resin is plasticized. In this case, the plasticizing cylinder 12 meters the resin that is conveyed forward within the plasticizing cylinder 12. When a predetermined quantity of resin has accumulated in the vicinity of the discharge port 124 inside the plasticizing cylinder 12, the plasticizing cylinder 12 moves the screw 122 forward to discharge the resin from the discharge port 124 to the outside.

[0032] Here, the screw 122 rotates in the same way as when performing resin metering, even when the screw 122 moves forward to discharge the resin from the discharge port 124. That is, the screw control unit 125 of the plasticizing cylinder 12 moves the screw 122 forward to discharge the resin from the discharge port 124, while the screw 122 rotates in the same direction as when the resin is metered through the metering zone 126. Thus, even when the screw 122 moves forward to discharge the resin from the discharge port 124, a state is maintained in which the resin can be conveyed from backward (upstream side in the centerline direction) to forward (downstream side in the centerline direction) of the plasticizing cylinder 12.

[0033] The screw control unit 125 of the plasticizing cylinder 12 enables various control of the screw 122. For example, the screw control unit 125 can control the speed of the screw 122 so that the speed of the screw 122 when the resin is metered through the metering zone 126 and the speed of the screw 122 when the screw 122 moves forward to dispense the resin are essentially the same. Here, "essentially the same" means that there is no difference in the speed of the screw 122 when the resin is metered and when the resin is dispensed, or that there is a difference in the speed, but the difference is small.

[0034] Furthermore, for example, the screw control unit 125 can change the rotational speed of the screw 122 in response to a change in the amount of resin received in the receiving section 121 of the plasticizing cylinder 12, and the amount of resin received and the amount of resin discharged from the plasticizing cylinder 12 can be controlled so that they are essentially equal. Here, the fact that the amount of resin received and the amount of resin discharged are essentially equal means either that the amount of resin received and the amount of resin discharged are equal, or that there is a difference between the amount of resin received and the amount of resin discharged, but the difference is small.

[0035] Furthermore, the screw control unit 125 can, for example, control the rotational speed of the screw 122 in response to the magnitude of the pressure exerted on the receiving section 121 and measured by the pressure measuring unit 128. For instance, the screw control unit 125 performs control to increase the rotational speed of the screw 122 when the magnitude of the pressure measured by the pressure measuring unit 128 is greater than a predetermined value. Conversely, the screw control unit 125 performs control to decrease the rotational speed of the screw 122 when the magnitude of the pressure measured by the pressure measuring unit 128 is less than a predetermined value. Here, the predetermined pressure value need not be a single numerical value but can be a range.

[0036] Fig. Figure 2 is a graph showing the time course of the control of the screw 122 by the screw control unit 125. Fig. 1 represents.

[0037] In the graph of Fig. 2 specifies a horizontal axis time (t). Each of the time periods t1 and t3 specifies the time period during which the resin passes through the metering zone 126 of the plasticizing cylinder 12. Fig. 1 is dosed. In addition, each of the time periods t2 and t4 indicates the time period during which the resin is dispensed from the plasticizing cylinder 12 and into the injection cylinder 13 of Fig. 1 is filled.

[0038] Furthermore, the graph of Fig. 2 a vertical axis of one of the rotational speed of the screw 122 of the plasticizing cylinder 12 of Fig. 1, the position of the screw 122 in the centerline direction in the plasticizing cylinder 12 and the pressure exerted on the receiving section 121 of the plasticizing cylinder 12. A line L1 indicates the change over time in the position of the screw 122 in the centerline direction in the plasticizing cylinder 12. In this case, the position of the screw 122 in the centerline direction is more towards the upstream (backward) side, and the position of the screw 122 in the centerline direction is more towards the downstream (forward) side, the lower the position on the vertical axis.

[0039] As in Fig. As shown in Figure 2, all shapes of line L1 in time periods t1 and t3 exhibit a linear shape extending in an upper right direction of the graph. Furthermore, all shapes of line L1 in time periods t2 and t4 exhibit a linear shape extending in a lower right direction of the graph. This is because the position of screw 122 in the centerline direction is controlled such that it moves backward from the downstream side (forward) to the upstream side (backward) during time periods t1 and t3, when the resin is being metered. Additionally, this is because the position of screw 122 in the centerline direction is controlled such that it moves forward from the upstream side (backward) to the downstream side (forward) during time periods t2 and t4, when the injection cylinder 13 is being filled with resin.

[0040] Furthermore, line L2 indicates the change over time in the size of the signal received by receiver section 121 from output unit 20. Fig. 1 dispensed resin exerted pressure, which is measured by the pressure measuring unit 128 of the plasticizing cylinder 12 of Fig. 1 is measured. In this case, the vertical axis of the graph indicates Fig. 2 indicates that the pressure exerted on the receiving section 121 increases towards an upper side. The magnitude of the pressure exerted on the receiving section 121 is controlled by adjusting the rotational speed of the screw 122 to maintain a constant pressure.

[0041] Furthermore, line L3 indicates the change over time in the rotational speed of screw 122. In this case, the vertical axis of the graph indicates Fig. 2 indicates that the rotational speed of the screw 122 increases towards the top. The rotational speed of the screw 122 is controlled in response to the magnitude of the pressure exerted on the receiving section 121. That is, the rotational speed of the screw 122 is controlled such that the pressure exerted on the receiving section 121 and the rotational speed of the screw 122 are proportionally related. Therefore, the shape of line L3 is similar to the shape of line L2. This is because, when the pressure exerted on the receiving section 121 increases, the rotational speed of the screw 122 is controlled to increase in response, and when the pressure exerted on the receiving section 121 decreases, the rotational speed of the screw 122 is controlled to decrease in response. This means that if the pressure exerted on the receiving section 121 increases, the rotational speed of the screw 122 is controlled in response to increase it.Consequently, the resin received by the receiving section 121 of the plasticizing cylinder 12 is likely to flow downstream (forward). As a result, the pressure exerted on the receiving section 121 decreases and returns to its original level.

[0042] On the other hand, if the pressure exerted on the receiving section 121 is reduced, resin can flow back (backflow). Therefore, the rotational speed of the screw 122 is controlled to decrease in response to a decrease in the pressure exerted on the receiving section 121. As a result, it is difficult for the resin received by the receiving section 121 of the plasticizing cylinder 12 to flow downstream (forward). Consequently, the pressure exerted on the receiving section 121 increases and returns to its original level. In this way, the rotational speed of the screw 122 is controlled in response to the magnitude of the pressure exerted on the receiving section 121 of the plasticizing cylinder 12. Consequently, the pressure exerted on the receiving section 121 is reduced in response to the pressure exerted on the receiving section 121, as shown by line L2 in the graph of Fig. 2 specified, controlled to be constant.

[0043] In the graph of Fig. During the time period t1 shown in Figure 2, the dosing zone 126 of the plasticizing cylinder 12 doses the resin. In addition, the screw control unit 125 moves... Fig. 1. The screw 122 is reversed from the downstream side to the upstream side in the centerline direction, while the screw 122 is rotated in a direction in which the resin is conveyed downstream (forward) in the centerline direction. Furthermore, the screw control unit 125 changes the rotational speed of the screw 122 in a time interval t11 within the time interval t1 in response to a sudden change in the pressure exerted on the receiving section 121. As a result, the pressure exerted on the receiving section 121 returns to its original level.

[0044] Furthermore, the worm gear control unit 125 moves in the graph of Fig. During the time period t2 shown in Figure 2, the screw 122 moves forward in the centerline direction towards the downstream side, while simultaneously rotating the screw 122 in the centerline direction in the direction of conveying the resin downstream (forward). As a result, the resin is discharged from the discharge port 124 of the plasticizing cylinder 12 and flows through the tube 129, filling the injection cylinder 13 with the resin. Furthermore, the screw control unit 125 changes the rotational speed of the screw 122 in response to a sudden change in the pressure exerted on the receiving section 121. Consequently, the pressure exerted on the receiving section 121 returns to its original level.

[0045] Furthermore, in the graph of Fig. During time period t3, as shown in Figure 2, the dosing zone 126 of the plasticizing cylinder 12 doses the resin. Furthermore, the screw control unit 125 moves the screw 122 backward from the downstream side to the upstream side in the centerline direction, while simultaneously rotating the screw 122 in a direction that conveys the resin downstream (forward) in the centerline direction. Additionally, during time interval t31 within time interval t3, the screw control unit 125 changes the rotational speed of the screw 122 in response to a sudden change in the pressure exerted on the receiving section 121. As a result, the pressure exerted on the receiving section 121 returns to its original level. Thereafter, although not shown, the same control process is repeated.

[0046] As described above, in the injection molding system 1 of Fig. 1. The resin is continuously dispensed from the output unit 20, and the resin is constantly supplied to the injection unit 11 of the injection molding machine 10 by flowing through the connecting pipe 30. Therefore, the screw control unit 125, which forms the plasticizing cylinder 12 of the injection unit 11, rotates the screw 122 in the direction of resin supply to the downstream side (forward) in the centerline direction, while controlling the position of the screw 122 in the centerline direction. The rotation of the screw 122 continues as long as the quantity of resin conveyed into the plasticizing cylinder 12 is not zero.

[0047] Furthermore, the screw control unit 125 changes the rotational speed of the screw 122 in response to a change in the pressure exerted on the receiving section 121, in order to control the pressure exerted on the receiving section 121 and return it to its original level. As a result, the plasticizing cylinder 12 can continuously receive the resin. Consequently, for example, the escape of molten resin from the gap of the plasticizing cylinder 12, which can be caused by an increase in the pressure of the resin applied to the receiving section 121, can be prevented. <modifikationsbeispiel>

[0048] As described above, the injection unit 11 according to the present embodiment is an injection unit of a so-called pre-plunger piston type (also referred to as a pre-plasticizing type), in which the independent plasticizing cylinder 12 and the injection cylinder 13 are combined. However, the pre-plunger piston type injection unit 11 according to the present embodiment is merely one example. For instance, an inline screw type injection unit can be used, in which plasticizing and injection are carried out in a single cylinder.

[0049] Even in the case of an inline screw-type injection unit, the resin is continuously dispensed from the output unit, and, as in the present embodiment described above, the resin is constantly fed into the cylinder. The screw is continuously rotated in the centerline direction in the direction of resin delivery downstream (forward) as long as the amount of resin delivered into the cylinder is not zero. Consequently, the cylinder of the inline screw-type injection unit can continuously receive the resin.

[0050] Furthermore, in the present embodiment, as in Fig. As shown in Figure 1, the pressure measuring unit 128 of the plasticizing cylinder 12 measures the pressure in the vicinity of the receiving section 121. Consequently, it is less necessary to consider the amount of energy lost (pressure loss in the pipe) when the resin dispensed by the output unit 20 flows through the connecting pipe 30. However, the position at which the pressure measuring unit 128 measures the pressure is not limited to the vicinity of the receiving section 121. For example, by prioritizing measurability over the pressure reading, a pressure can be measured at any position in the connecting pipe 30, or a pressure can be measured at any position in the output unit 20.

[0051] In summary, the injection molding machine 10 according to the present embodiment only needs to have the following configuration and can take on various embodiments.

[0052] That is, the injection molding machine 10 contains the plasticizing cylinder 12, which continuously receives the resin from the receiving section 121 into the interior, conveys the resin forward by rotating the screw 122 and discharges the conveyed resin outwards by moving the screw 122 forward, whereby, even when the screw 122 is moved forward, the screw 122 is rotated in the same direction as when the resin is conveyed forward.

[0053] This means that even in a state where the resin continuously dispensed by the output unit 20 is constantly conveyed into the receiving section 121 of the plasticizing cylinder 12, the received resin is conveyed forward by the rotation of the screw 122. As a result, the resin is prevented from remaining in the vicinity of the receiving section 121 of the plasticizing cylinder 12. Consequently, for example, the occurrence of a situation in which the resin escapes from the plasticizing cylinder 12 is prevented, since an increase in the pressure exerted on the receiving section 121 is prevented.

[0054] Here, the injection molding machine 10 can also include the screw control unit 125 as a screw control device for controlling the speed of the screw 122.

[0055] This means that the rotational speed of the screw 122 is controlled by the screw control unit 125. As a result, the screw control unit 125 changes the rotational speed of the screw 122, thus preventing the resin from remaining near the receiving section 121.

[0056] Furthermore, the screw control unit 125 can control the speed of the screw 122 so that the speed of the screw 122 when the resin is dispensed is essentially the same as the speed of the screw 122 when a predetermined amount of resin is dosed.

[0057] This means that the rotational speed of screw 122 when the resin is dispensed and the rotational speed of screw 122 when the predetermined quantity of resin is dosed are controlled to be essentially the same. As a result, the magnitude of the pressure exerted on the receiving section 121 of the plasticizing cylinder 12 can be kept constant. Consequently, for example, a situation in which the resin leaks from the plasticizing cylinder 12 is prevented.

[0058] Furthermore, the screw control unit 125 can change the rotational speed of the screw 122 in response to a change in the amount of resin received in the plasticizing cylinder 12 and control the rotational speed of the screw 122 so that the amount of resin dispensed from the plasticizing cylinder 12 is essentially equal to the amount of resin received in the plasticizing cylinder 12.

[0059] This means that the rotational speed of the screw 122 is changed in response to the amount of resin received in the plasticizing cylinder 12 and is controlled so that the amount of resin received and the amount of resin discharged are essentially equal. As a result, the flow rate of the resin in the plasticizing cylinder 12 can be adjusted. Consequently, for example, a situation in which the resin overflows from the plasticizing cylinder 12 is prevented.

[0060] Furthermore, the injection molding machine 10 can also include the pressure measuring unit 128, which measures the pressure exerted on the receiving section 121 of the resin that is continuously dispensed by the output unit 20, wherein the screw control unit 125 can control the rotational speed of the screw 122 in response to the magnitude of the measured pressure.

[0061] Furthermore, the screw control unit 125 performs control to increase the rotational speed of the screw 122 if the pressure measured by the pressure measuring unit 128 is greater than a predetermined value. In addition, the screw control unit 125 can perform control to reduce the rotational speed of the screw 122 if the pressure measured by the pressure measuring unit 128 is less than a predetermined value.

[0062] This means that if the measured pressure increases, the rotational speed of screw 122 is controlled accordingly, and if the measured pressure decreases, the rotational speed of screw 122 is controlled accordingly, and thus decreased. As a result, the magnitude of the measured pressure is controlled to remain constant regardless of changes over time. Consequently, for example, a situation in which resin leaks from the plasticizing cylinder 12 is prevented.

[0063] Furthermore, according to the present embodiment, the injection molding system 1 only needs to have the following configuration and can assume various embodiments.

[0064] That is, the injection molding system 1 includes the output unit 20, which dispenses the resin, and the injection molding machine 10, which receives the dispensed resin, plasticizes and melts the resin, injects the resin into the mold 50, and forms the resin with the mold 50, wherein the injection molding machine 10 plasticizes the cylinder 12, which continuously receives the resin from the receiving section 121 to the interior, conveys the resin forward by rotating the screw 122, and discharges the conveyed resin outwards by moving the screw 122 forward, and, even when the screw 122 is moved forward, the screw 122 is rotated in the same direction as when the resin is conveyed forward. Brief description of the reference symbols 1 injection molding system 10 injection molding machines 11 Injection unit 12 plasticizing cylinders 13 injection cylinders 20 output units 30 connecting pipe 50 Form 51 injection molded frames 52 Admission 121 Reception section 122 snail 123 Top section 124 Delivery connection 125 worm gear control unit 126 Dosing zone 127 Band heating 128 Pressure measuring unit 129 pipe 131 plunger pistons 132 Injection port QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024-152368

[0002] WO 2022 / 056618

[0003] < / modifikationsbeispiel>

Claims

[1] Injection molding machine (10), comprising: a plasticizing cylinder (12) which continuously receives a resin from a receiving section (121) into an interior, conveys the resin forward by rotating a screw (122) and discharges the conveyed resin to the outside by moving the screw (122) forward, wherein, even when the screw (122) is moved forward, the screw (122) is rotated in the same direction as when the resin is conveyed forward. [2] Injection molding machine (10) according to claim 1, further comprising: Screw control device for controlling the rotational speed of the screw (122). [3] Injection molding machine (10) according to claim 2, wherein the screw control means controls the rotational speed of the screw (122) such that the rotational speed of the screw (122) when the resin is dispensed is substantially the same as the rotational speed of the screw (122) when a predetermined quantity of resin is dosed. [4] Injection molding machine (10) according to claim 2, wherein the screw control means changes the rotational speed of the screw (122) in response to a change in the amount of resin received in the plasticizing cylinder (12) and controls the rotational speed of the screw (122) such that the amount of resin dispensed from the plasticizing cylinder (12) is substantially the same as the amount of resin received. [5] Injection molding machine (10) according to claim 2, further comprising: Pressure measuring means for measuring a pressure exerted on the receiving section (121) of the resin, wherein the screw control device controls the rotational speed of the screw (122) in response to a measure of the measured pressure. [6] Injection molding machine (10) according to claim 5, wherein the screw control means performs control to increase the rotational speed when the magnitude of the measured pressure is greater than a predetermined magnitude, and performs control to reduce the rotational speed when the magnitude of the measured pressure is less than the predetermined magnitude. [7] Injection molding system (1), comprising: an output unit (20) that dispenses a resin; and an injection molding machine (10) which receives the dispensed resin, plasticizes and melts the resin, injects the resin into a mold (50) and shapes the resin with the mold (50), wherein the injection molding machine (10) includes a plasticizing cylinder (12) which continuously receives the resin from a receiving section (121) into an interior, conveys the resin forward by rotating a screw (122) and discharges the conveyed resin outwards by moving the screw (122) forward, and, even when the screw (122) is moved forward, the screw (122) is rotated in the same direction as when the resin is conveyed forward.

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