Plastic injection molding device, multi-cavity injection mold and method

Abstract

The embodiment of the invention provides a plastic injection molding device, a multi-cavity injection mold and a method. Comprising a machine shell, a driving mechanism, a screw injection molding module, a reducing three-way pipe, a guide mechanism and two adjusting mechanisms. The driving mechanism and the screw injection molding module are connected to the machine shell, the driving mechanism is used for driving a mold to move, and the discharging end of the screw injection molding module is connected with the reducing three-way pipe; the screw injection molding module divides molten plastic into two paths through the reducing three-way pipe and injects the molten plastic into the mold through the guide mechanism, and the two adjusting mechanisms are used for adjusting the sectional area of the molten plastic in the two paths correspondingly; relates to the field of injection devices of plastic injection molding machines. Molten plastic is shunted through the reducing three-way pipe, and the flow of each path of plastic is dynamically controlled by combining two adjusting mechanisms, so that uniform injection molding of a special-shaped mold is ensured, and the molding quality and the production efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of injection devices of plastic injection molding machines, and specifically refers to a plastic injection device, a multi-cavity injection mold and a method. Background Art

[0002] Plastic injection molding technology is widely used in the manufacturing of various precision plastic products, especially in the fields of automobiles, electronics and medical equipment. With the complication of product design, the application of special-shaped molds (i.e., molds with cavities of different shapes or sizes) in injection molding is increasing. Among them, the core of the injection device of an injection molding machine is to accurately inject molten plastic into the mold through the injection device to ensure the quality and consistency of the molded parts.

[0003] In the prior art, a typical injection device usually includes a machine shell, a driving mechanism, a screw injection module and a guiding mechanism. The screw injection module is used to melt plastic raw materials and inject them into the mold. The driving mechanism is responsible for opening and closing the mold, and the guiding mechanism guides the molten plastic into the injection port of the mold. However, when using a special-shaped mold for multi-cavity injection, due to the different shapes, sizes or filling requirements of each cavity, it is often difficult to accurately control the flow rate distribution of the molten plastic, resulting in the following problems: Uneven injection: The filling speed or pressure of different cavities is inconsistent, resulting in insufficient or excessive filling of some cavities, affecting the dimensional accuracy and surface quality of the molded parts.

[0004] Unstable molding quality: The existing devices lack an effective flow rate adjustment mechanism and cannot dynamically adjust the plastic flow rate of each path according to the real-time needs of the special-shaped mold, resulting in defects such as warping, bubbles or residual stress in the molded parts.

[0005] Low production efficiency: To make up for uneven injection, operators need to frequently adjust equipment parameters or perform subsequent trimming, increasing production time and costs.

[0006] In the prior art, some injection devices attempt to adjust the flow rate of molten plastic through a shunt pipeline or a manual valve, but these methods have the following deficiencies: The flow rate distribution of the shunt pipeline is fixed and it is difficult to adapt to the dynamic needs of special-shaped molds; The adjustment accuracy of the manual valve is low, the response speed is slow, and it depends on the experience of the operator, making it difficult to achieve automated and precise control.

[0007] Therefore, how to provide a plastic injection device that can accurately control the flow rate of multiple paths of molten plastic, adapt to the needs of different cavities of special-shaped molds, and achieve uniform injection has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0008] According to an embodiment of the present invention, there is provided a plastic injection device, a multi-cavity injection mold and a method. It is used to solve the problems in the existing background.

[0009] In the first aspect of the present invention, a plastic injection molding device is provided.

[0010] It includes a casing, a driving mechanism, a screw injection molding module, a reducing tee, a guiding mechanism and two adjusting mechanisms; the driving mechanism and the screw injection molding module are connected to the casing, the driving mechanism is used to drive the mold to move, the discharging end of the screw injection molding module is connected to the reducing tee, the screw injection molding module divides the molten plastic into two paths through the reducing tee and injects the molten plastic into the mold through the guiding mechanism, and the two adjusting mechanisms are respectively used to adjust the cross-sectional area of the molten plastic in the two paths.

[0011] Preferably, the guiding mechanism includes two connectors, two pipe bodies and two brackets; The two connectors are connected to the reducing tee, the two brackets are respectively connected to the two pipe bodies and the two connectors, the two brackets are connected to each other, the two brackets are connected to the casing, and the adjusting mechanism is arranged between the connector and the pipe body.

[0012] Preferably, the two adjusting mechanisms both include arc-shaped plates, inner rings, four toothed rings, four gears, four racks, four adjusting blocks, four limiting blocks, a lever, a hole body, four frames and openings; The arc-shaped plate is connected to the casing, the arc-shaped plate is rotatably connected to the inner ring, the inner sides of the inner ring are respectively connected to the four toothed rings, the four toothed rings are respectively meshed and connected to the four gears, the four gears are respectively meshed and connected to the four racks, the four racks are respectively connected to the four adjusting blocks, the four adjusting blocks are respectively slidably connected to the four limiting blocks, the four frames are respectively rotatably connected to the four gears, the four limiting blocks and the four frames are both connected to the pipe body, and the lever is connected to the inner ring; Among them, the four adjusting blocks are in contact with each other, the inner sides of the four adjusting blocks enclose the hole body, and the hole body is the passage of the molten plastic; Among them, the two arc-shaped plates of the two adjusting mechanisms are both processed with the openings, the two openings are arranged at positions where the two arc-shaped plates are close to each other, the lever is connected to the inner ring, and the lever can move inside the opening.

[0013] Preferably, it further includes a linkage mechanism, the linkage mechanism is used to synchronously drive the two adjusting mechanisms to move, and the linkage mechanism includes two convex blocks, two chutes, two first sliders, two first slide rails, two outer frames and a connecting piece; The two sliding grooves are respectively machined on the two shifting rods, the two bumps are respectively slidably connected to the two sliding grooves, the two bumps are respectively connected to the two first sliders, the two first sliders are respectively slidably connected to the two first sliding rails, the two first sliding rails are respectively connected to the two outer frames, and the two outer frames are connected by the connecting piece; The first slider is used to adjust the position of the bump in the sliding groove.

[0014] Preferably, the linkage mechanism further includes a second slider, a second sliding rail and a frame; The connecting piece is connected to the second slider, the second slider is slidably connected to the second sliding rail, the second sliding rail is connected to the frame, the frame is connected to the casing, and the second slider can indirectly drive the bump to move laterally.

[0015] Preferably, a cooling mechanism is further included, and the cooling mechanism includes a water tank, a pump body, a three-way joint, two first connecting pipes, two electric ball valves and two second connecting pipes; The water tank is connected to the casing, the water tank is connected to the pump body, the input end of the pump body passes through the water tank, the output end of the pump body is connected to the three-way joint, the three-way joint is respectively connected to the two first connecting pipes, the two first connecting pipes are respectively connected to the two electric ball valves, the two electric ball valves are respectively connected to the two second connecting pipes, and the two second connecting pipes are connected to the mold.

[0016] Preferably, two monitoring mechanisms are further included, and the monitoring mechanism includes a pressure sensor, a contact rod, two cylinders, a tension spring and a clamping block; The pressure sensor is connected to the casing, the end of the contact rod can contact the monitoring end of the pressure sensor, the two cylinders are connected to the shifting rod, the two cylinders are slidably connected to the contact rod, the clamping block is connected to the contact rod, and the two ends of the tension spring are respectively connected to the clamping block and the cylinder. When the contact rod contacts the monitoring end of the pressure sensor, the contact rod moves relative to the two cylinders and drives the tension spring to stretch; Wherein, when the shifting rod indirectly drives the four adjusting blocks to move and expand the hole body, the contact rod on the shifting rod at this time can contact the monitoring end of the pressure sensor.

[0017] In a second aspect of the present invention, a multi-cavity injection mold is provided.

[0018] It includes a lower mold, an upper mold, two injection ports, a first injection cavity, a second injection cavity and two refrigerant channels; The two refrigerant channels are both processed on the lower mold, and the two injection ports are processed on the upper mold. When the upper mold and the lower mold are closed, the first injection cavity and the second injection cavity are formed between the upper mold and the lower mold. The shapes of the first injection cavity and the second injection cavity are different. The two injection ports and the two refrigerant channels correspond to the first injection cavity and the second injection cavity, respectively.

[0019] A third aspect of the present invention provides a plastic injection molding device method.

[0020] The steps include: Install a multi-cavity injection mold, fix the lower mold to the housing, connect the upper mold to the drive mechanism, and connect the refrigerant channel of the lower mold to the second connecting pipe of the cooling mechanism; Prepare the equipment, load plastic pellets into the hopper of the screw injection module, inject coolant into the water tank, and check the initial status of the adjustment mechanism, linkage mechanism, and monitoring mechanism; Start the equipment, preheat the screw injection mold to -℃, and start the pump to circulate the coolant; Mold closing, driving the upper mold and the lower mold to close the mold through the driving mechanism to form a first injection cavity and a second injection cavity; Injection molding, the screw injection molding module melts the plastic, and injects two paths of molten plastic into the injection port through the reducing tee pipe and the guide mechanism; To adjust the flow rate, the first slider and the second slider of the linkage mechanism are driven by an external controller, the lever of the adjustment mechanism is adjusted, the cross-sectional area of the hole body is controlled, and the flow rates of the two plastics are adjusted synchronously; Cooling, the pump body delivers coolant through the refrigerant channel, the pressure sensor of the monitoring mechanism detects the movement of the lever and controls the electric ball valve to adjust the coolant flow; Open the mold and take out the parts. After cooling, the upper mold is opened by the driving mechanism to take out the molded parts. Stop the machine, turn off the heating device and pump body, disconnect the power supply and clean the mold.

[0021] Preferably, in the flow adjustment, the linkage mechanism adjusts the position of the protrusion in the slide groove through the first slider, changes the rotation amplitude of the lever, and realizes that when the plastic flow in one way increases, the flow in the other way decreases, so as to keep the total flow consistent, and the adjustment accuracy is . mm.

[0022] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. The present invention provides a plastic injection molding device, a multi-cavity injection mold and a method. In view of the deficiencies in the prior art, the present invention proposes a plastic injection molding device that diverts molten plastic through a three-way pipe of different diameters and combines two adjustment mechanisms to dynamically control the plastic flow of each path, thereby ensuring uniform injection molding of heterogeneous molds and improving molding quality and production efficiency.

[0023] It should be understood that the content described in the Summary of the Invention section is not intended to define the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In conjunction with the accompanying drawings and with reference to the following detailed description, the above and other features, advantages, and aspects of the embodiments of the present invention will become more apparent. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 FIG. 1 shows a schematic perspective view of a plastic injection molding device according to an embodiment of the present invention; Figure 2 FIG. 2 shows an exploded view of a plastic injection molding device according to an embodiment of the present invention; Figure 3 FIG. 3 shows a schematic connection structure view of a cooling mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 4 FIG. 4 shows an exploded view of a cooling mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 5 FIG. 5 shows a schematic connection structure view of a guiding mechanism and an adjusting mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 6 FIG. 6 shows an enlarged view of an adjusting mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 7 FIG. 7 shows a schematic connection structure view of a linkage mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 8 FIG. 8 shows a schematic connection structure view of an arc plate, an inner ring, and a gear ring of a plastic injection molding device according to an embodiment of the present invention; Figure 9 FIG. 9 shows a schematic connection structure view of a linkage mechanism and a monitoring mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 10 FIG. 10 shows a schematic connection structure view of a monitoring mechanism of a plastic injection molding device according to an embodiment of the present invention; Figure 11 FIG. 11 shows a schematic perspective view of a multi-cavity injection mold according to an embodiment of the present invention.

[0025] The reference numerals are as follows: 1 - Housing, 2 - Driving mechanism, 3 - Screw injection molding module, 4 - Cooling mechanism, 401 - Water tank, 402 - Pump body, 403 - Three-way joint, 404 - Electric ball valve, 405 - Second connecting pipe, 406 - First connecting pipe, 5 - Guiding mechanism, 501 - Connector, 502 - Pipe body, 503 - Bracket, 6 - Adjusting mechanism, 601 - Arc plate, 602 - Inner ring, 603 - Gear ring, 604 - Gear, 605 - Rack, 606 - Adjusting block, 607 - Limiting block, 608 - Lever, 609 - Hole body, 610 - Frame body, 611 - Opening, 7 - Linkage mechanism, 701 - Protrusion, 702 - First slider, 703 - First slide rail, 704 - Outer frame, 705 - Connector piece, 706 - Second slider, 707 - Second slide rail, 708 - Frame, 709 - Chute, 8 - Monitoring mechanism, 801 - Pressure sensor, 802 - Contact rod, 803 - Cylinder, 804 - Tension spring, 805 - Locking block, 9 - Reducing three-way pipe, 10 - Lower mold, 11 - Upper mold, 12 - Refrigerant channel, 13 - First injection cavity, 14 - Injection port, 15 - Second injection cavity. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0028] As Figures 1 to 10 shown, the plastic injection molding device includes a housing 1, a driving mechanism 2, a screw injection molding module 3, a reducing three-way pipe 9, a guiding mechanism 5, and two adjusting mechanisms 6. The structures and functions of each component will be described in detail below.

[0029] The housing 1 is provided with a mounting seat for mounting the driving mechanism 2 and the screw injection molding module 3, and a connection interface for fixing the reducing three-way pipe 9 and the guiding mechanism 5.

[0030] The driving mechanism 2 is fixedly installed on the machine housing 1 and is used to drive the mold to move in a predetermined direction to achieve the opening and closing or positioning of the mold. The driving mechanism 2 includes, but is not limited to, a hydraulic drive system, a servo motor drive system, or a pneumatic drive system. In a preferred embodiment, the driving mechanism 2 uses a servo motor in cooperation with a gear transmission mechanism to provide precise displacement control. The driving mechanism 2 is connected to the mold through a transmission shaft or a coupling to ensure the smooth movement of the mold during the injection molding process.

[0031] The screw injection molding module 3 is installed on the machine housing 1 and is used to heat and melt the plastic raw material and inject it into the mold. The screw injection molding module 3 includes a hopper, a screw, a heating device, and a discharge end. The hopper is used to receive plastic pellets, and the screw pushes and compresses the plastic pellets forward by rotation. The heating device (such as an electric heating coil) heats the plastic pellets to a molten state. The discharge end of the screw injection molding module 3 is hermetically connected to the inlet of the reducing tee 9 to ensure the smooth transportation of the molten plastic.

[0032] The reducing tee 9 has a tee structure with one inlet and two outlets. The inlet is connected to the discharge end of the screw injection molding module 3, and the two outlets are respectively connected to the guiding mechanism 5. The function of the reducing tee 9 is to divide the molten plastic output by the screw injection molding module 3 into two paths to achieve multi-point injection molding. The internal channel of the reducing tee 9 is designed to be streamlined to reduce the flow resistance of the molten plastic and avoid material retention or degradation. Preferably, the reducing tee 9 is made of a high-temperature resistant and corrosion-resistant alloy material.

[0033] The guiding mechanism 5 is arranged between the two outlets of the reducing tee 9 and the mold and is used to accurately guide the two paths of molten plastic to the injection ports of the mold. The guiding mechanism 5 includes a diversion pipe and a nozzle assembly, wherein the diversion pipe is hermetically connected to the outlet of the reducing tee 9, and the nozzle assembly is docked with the injection port of the mold.

[0034] Two adjusting mechanisms 6 respectively correspond to the two outlets of the reducing tee 9 and are installed on the guiding mechanism 5 and are used to adjust the cross-sectional area of each path of molten plastic, thereby controlling the plastic flow rate of each path during the injection molding process.

[0035] In actual use, the working process of the plastic injection molding device is as follows: Plastic pellets are added into the hopper of the screw injection molding module 3. The screw injection molding module 3 melts the plastic pellets through the action of screw rotation and heating device and pushes them to the discharge end. The molten plastic is divided into two paths through the reducing tee 9 and enters the diversion pipes of the guiding mechanism 5 respectively. The two adjusting mechanisms 6 adjust the cross-sectional areas of the two paths of molten plastic according to the mold requirements respectively, and control the plastic flow rate of each path. The guiding mechanism 5 injects the two paths of molten plastic into the injection port of the mold through the nozzle assembly, and the driving mechanism 2 drives the mold to close to complete the injection process. After the injection is completed, the driving mechanism 2 drives the mold to open, and the molded part is taken out to complete one injection cycle. The plastic injection molding device of the present invention realizes the diversion of molten plastic through the reducing tee 9, combines the two adjusting mechanisms 6 to accurately control the plastic flow rate of each path, and can adapt to various molds and injection requirements. The guiding mechanism 5 ensures the stable transportation of plastic, and the driving mechanism 2 provides reliable mold movement control, thereby improving the injection efficiency and the quality of the finished product. In addition, the device has a compact structure and is easy to operate, and is suitable for the injection molding processing of various plastic materials.

[0036] In this embodiment, the guiding mechanism 5 is used to accurately guide the two paths of molten plastic diverted by the reducing tee 9 to the injection port of the mold. Its structure includes two connectors 501, two pipe bodies 502 and two brackets 503.

[0037] The two connectors 501 are respectively sealed and connected to the two outlets of the reducing tee 9 for receiving the molten plastic diverted by the reducing tee 9. Each connector 501 is a hollow structure, and the internal channel is designed to be streamlined to reduce the flow resistance of the molten plastic and prevent material retention. The connector 501 is made of a high-temperature resistant and corrosion-resistant alloy material (such as stainless steel or nickel-based alloy) to adapt to the working environment of high-temperature molten plastic. One end of the connector 501 is fixed to the outlet of the reducing tee 9 by flange or thread connection.

[0038] The pipe body 502 is a hollow tubular structure, made of the same material as the connector 501, and the internal channel is also designed to be streamlined to ensure the smooth flow of the molten plastic. In a preferred embodiment, an electric heating sleeve or a heat preservation layer is provided on the outer wall of the pipe body 502 to maintain the temperature of the molten plastic during transportation and prevent the plastic from cooling or viscosity change. The output end of the pipe body 502 is provided with a nozzle assembly, which is docked with the injection port of the mold to ensure the sealing and stability of the injection process.

[0039] Two brackets 503 are used to fix and support the joint 501 and the pipe body 502, ensuring the stability of the guiding mechanism 5 during the injection molding process. Each bracket 503 is connected to the corresponding joint 501 and pipe body 502 by bolts or welding to form a stable support structure. The two brackets 503 are fixedly connected by a transverse connecting member (such as a connecting rod or a connecting plate) to enhance the overall rigidity. The bottom of the bracket 503 is fixed to the preset mounting seat of the machine shell 1 by bolts or buckles to ensure the reliable connection between the guiding mechanism 5 and the machine shell 1.

[0040] Two adjusting mechanisms 6 are respectively arranged at the connection between the joint 501 and the pipe body 502, and are used to adjust the cross-sectional area of each path of molten plastic, so as to accurately control the plastic flow rate of each path during the injection molding process.

[0041] In actual use, the working process of the guiding mechanism 5 and related components is as follows: The screw injection molding module 3 divides the molten plastic into two paths through the reducing tee 9 and enters the two joints 501 respectively. The joint 501 guides the molten plastic into the pipe body 502, and the pipe body 502 accurately injects the plastic into the injection port of the mold through the nozzle assembly. The two adjusting mechanisms 6 respectively adjust the cross-sectional area of the channels between the joint 501 and the pipe body 502 according to the injection requirements of the mold to control the plastic flow rate of each path. The bracket 503 fixes the joint 501 and the pipe body 502, and ensures the stability of the guiding mechanism 5 through the connection with the machine shell 1. During the whole process, the streamlined channel design and heat preservation measures of the joint 501 and the pipe body 502 ensure the smooth flow and temperature stability of the molten plastic. The precise control of the adjusting mechanism 6 ensures the uniformity and consistency of the injection flow rate, thereby improving the injection molding quality. Through the collaborative design of the joint 501, the pipe body 502 and the bracket 503, the efficient and stable transportation of the molten plastic is realized. The setting of the two adjusting mechanisms 6 enables the injection flow rate to be flexibly adjusted according to the mold requirements, meeting the requirements of various injection molding processes. In addition, the joint 501 and the pipe body 502 are made of high-temperature resistant and corrosion-resistant materials, and combined with the streamlined channel and heat preservation measures, effectively avoiding the retention and degradation of the molten plastic, and improving the injection efficiency and the quality of the finished product.

[0042] In this embodiment, the adjusting mechanism 6 is used to adjust the cross-sectional area of the channel of the molten plastic in the guiding mechanism 5 to control the plastic flow rate of each path during the injection molding process. In this embodiment, the structures of the two adjusting mechanisms 6 are the same. Each adjusting mechanism 6 includes an arc plate 601, an inner ring 602, four gear rings 603, four gears 604, four racks 605, four adjusting blocks 606, four limiting blocks 607, a lever 608, a hole body 609, four frames 610 and an opening 611. The structures, connection relationships and functions of the following components will be described in detail.

[0043] The arc-shaped plate 601 is fixed to the casing 1 and serves as the support base of the adjusting mechanism 6. The outer edge of the arc-shaped plate 601 is connected to the preset mounting seat of the casing 1 by bolts. An annular chute is provided on the inner side of the arc-shaped plate 601, forming a rotational connection with the inner ring 602. An opening 611 is machined on the arc-shaped plate 601. The opening 611 is an arc-shaped groove and is located on the side of the arc-shaped plate 601 close to another adjusting mechanism 6, for restricting the movement range of the lever 608.

[0044] The inner ring 602 is an annular structure and is installed in the annular chute of the arc-shaped plate 601, achieving smooth rotation with the arc-shaped plate 601 through bearings. The inner side of the inner ring 602 is fixedly connected to four toothed rings 603 by bolts. The outer side of the inner ring 602 is connected to the lever 608, and the lever 608 is used to drive the inner ring 602 to rotate.

[0045] The four toothed rings 603 are distributed on the inner side of the inner ring 602. Each toothed ring 603 is an arc-shaped tooth structure and is fixed to the inner ring 602 by welding or threaded connection. The tooth part of each toothed ring 603 meshes with the corresponding gear 604 to conduct the rotational movement of the inner ring 602.

[0046] The four gears 604 are respectively meshed with the four toothed rings 603. Each gear 604 is installed on the corresponding frame body 610 through a rotating shaft, forming a rotational connection with the frame body 610. The gear 604 is simultaneously meshed with the corresponding rack 605, converting the rotational movement into the linear movement of the rack 605.

[0047] The four racks 605 are linear rack structures. One end of each rack 605 is meshed with the corresponding gear 604, and the other end is fixedly connected to the corresponding adjusting block 606 by bolts or pins. The rack 605 slides in a linear direction to drive the adjusting block 606 to move.

[0048] The four adjusting blocks 606 are trapezoidal block structures. The inner sides of the four adjusting blocks 606 are in contact with each other, enclosing a hole body 609. The hole body 609 is the flow channel of the molten plastic, and its cross-sectional area is determined by the relative positions of the four adjusting blocks 606. The outer side of each adjusting block 606 is connected to the corresponding rack 605, and the inner side is provided with a smooth surface to reduce the flow resistance of the plastic. The adjusting block 606 is made of high-temperature resistant and corrosion-resistant materials (such as ceramics or special alloys) to adapt to the working environment of the molten plastic.

[0049] The four limit blocks 607 are respectively slidably connected to the four adjusting blocks 606, for guiding and restricting the moving direction of the adjusting blocks 606. Each limit block 607 is fixed to the inner wall of the pipe body 502 and cooperates with the adjusting block 606 through a chute or a guide rail to ensure that the adjusting block 606 moves along a predetermined path without deviation. The limit block 607 is made of the same high-temperature resistant material as the adjusting block 606.

[0050] The lever 608 is a rod-shaped structure. One end is fixed to the outer side of the inner ring 602 by bolts or welding, and the other end extends into the opening 611 of the arc-shaped plate 601. The lever 608 can reciprocate within the arc range of the opening 611 to drive the rotation of the inner ring 602. The lever 608 can be manually operated or connected to a servo motor for automatic control.

[0051] The four frames 610 are support structures. Each frame 610 is fixed to the inner wall of the pipe body 502 by bolts. The frame 610 is provided with a rotating shaft hole, which is matched with the rotating shaft of the corresponding gear 604 to form a rotating connection.

[0052] The hole body 609 is formed by enclosing the inner sides of the four adjusting blocks 606 and is a flow channel for molten plastic. The cross-sectional area of the hole body 609 is adjusted by the relative movement of the adjusting blocks 606 to control the plastic flow rate. The inner wall of the hole body 609 is smooth to reduce the flow resistance of the plastic.

[0053] The opening 611 is an arc-shaped groove on the arc-shaped plate 601 and is located on the side where the arc-shaped plates 601 of the two adjusting mechanisms 6 are close to each other. The radian range of the opening 611 is 30° to 120° (preferably 60°) to limit the movement range of the lever 608, thereby controlling the rotation angle of the inner ring 602.

[0054] During actual use, the working process of the adjusting mechanism 6 is as follows: The inner ring 602 is driven by the lever 608 to rotate in the sliding groove of the arc-shaped plate 601, and the movement of the lever 608 is restricted by the opening 611. The rotation of the inner ring 602 drives the four toothed rings 603 to rotate synchronously. The toothed ring 603 drives the gear 604 to rotate through meshing with the gear 604. The rotation of the gear 604 is further converted into the linear movement of the rack 605 through meshing with the rack 605. The rack 605 pushes or pulls the adjusting block 606 to slide along the limiting block 607, so that the four adjusting blocks 606 approach or move away from the center of the hole body 609, thereby changing the cross-sectional area of the hole body 609. When the cross-sectional area of the hole body 609 decreases, the flow rate of the molten plastic decreases; when the cross-sectional area increases, the flow rate increases. The two adjusting mechanisms 6 respectively correspond to the two-way molten plastic channels of the guiding mechanism 5. By independently adjusting the cross-sectional area of their respective hole bodies 609, precise control of the plastic flow rate of each path is achieved. Through the transmission mechanism of the toothed ring 603, the gear 604 and the rack 605, the rotational movement of the lever 608 is converted into the precise linear movement of the adjusting block 606, realizing stepless adjustment of the cross-sectional area of the hole body 609. The sliding connection between the adjusting block 606 and the limiting block 607 ensures the stability and precision of the movement, and the fixed design of the frame 610 enhances the overall rigidity of the mechanism. The opening 611 limits the movement range of the lever 608 to avoid excessive adjustment. In addition, the independent setting of the two adjusting mechanisms 6 enables the adjustment of the plastic flow rates of the two paths to be independent of each other, meeting the injection requirements of multi-point injection or complex molds, and improving the flexibility and molding quality of the injection process.

[0055] In this embodiment, the linkage mechanism 7 is used to synchronously drive the movements of the two adjusting mechanisms 6 to achieve coordinated adjustment of the flow rates of the two paths of molten plastic. In this embodiment, the linkage mechanism 7 includes two bumps 701, two chutes 709, two first sliders 702, two first slide rails 703, two outer frames 704, and a connecting member 705. The structures, connection relationships, and functions of each component will be described in detail below.

[0056] The two bumps 701 are columnar structures and are respectively slidably connected to the two chutes 709. One end of the bump 701 is embedded in the chute 709, and the other end is fixedly connected to the corresponding first slider 702 by bolts or pins. The bump 701 can slide along the length direction of the chute 709 within the chute 709 to adjust its position in the chute 709.

[0057] The two chutes 709 are respectively machined on the lever 608 of the two adjusting mechanisms 6. Each chute 709 is a long strip-shaped groove and extends along the length direction of the lever 608. The width of the chute 709 matches the size of the bump 701 to ensure the stability and accuracy of the sliding connection. The setting of the chute 709 allows the position of the bump 701 on the lever 608 to be adjustable, thereby adjusting the transmission effect of the linkage mechanism 7.

[0058] The two first sliders 702 are respectively connected to the two bumps 701. Each first slider 702 is fixed to the bump 701 through a threaded hole or a buckle to ensure the reliability of the transmission. The first slider 702 is driven electrically and forms a sliding connection with the corresponding first slide rail 703. The first slider 702 is used to adjust the position of the bump 701 in the chute 709.

[0059] The two first slide rails 703 are linear guide rail structures and are respectively fixedly connected to the two outer frames 704. The first slide rail 703 is fixed to the inner side of the outer frame 704 by bolts or welding to ensure the stability of the sliding direction.

[0060] The two outer frames 704 are rectangular frame structures and are respectively used to support the first slide rail 703. Each outer frame 704 is fixed to a preset mounting seat on the machine housing 1 by bolts. The two outer frames 704 are fixedly connected by a connecting member 705 to form a unified linkage structure.

[0061] The connecting member 705 is a rod-shaped or plate-shaped structure, spans between the two outer frames 704, and is fixedly connected to the two outer frames 704 by bolts or welding.

[0062] The linkage mechanism 7 further includes a second slider 706, a second slide rail 707, and a frame 708 to enhance the movement stability and adjustment accuracy of the linkage mechanism. The structures, connection relationships, and functions of the newly added components will be described in detail below and explained in combination with the overall function of the linkage mechanism 7.

[0063] The second slider 706 is driven electrically and is fixedly connected to the connecting member 705. The second slider 706 is connected to the middle position of the connecting member 705 by bolts or welding to ensure effective force transmission. The second slider 706 forms a sliding connection with the second slide rail 707 and can slide smoothly along the length direction of the second slide rail 707. The second slider 706 indirectly drives the movement of the two outer frames 704 through the connecting member 705, thereby affecting the lateral movement of the bump 701.

[0064] The second slide rail 707 is of a linear guide rail structure and is fixed to the frame 708. The second slide rail 707 is connected to the inner side of the frame 708 by bolts or buckles, and its length direction is parallel to the movement direction of the connecting member 705.

[0065] The frame 708 is a rectangular or trapezoidal support structure for fixing the second slide rail 707 and providing the overall stability of the linkage mechanism 7. The frame 708 is fixed to the preset mounting seat of the machine shell 1 by bolts.

[0066] During actual use, the working process of the linkage mechanism 7 is as follows: Operate the lever 608 of one of the adjusting mechanisms 6 to move. The sliding groove 709 on the lever 608 drives the corresponding bump 701 to slide. The movement of the bump 701 is transmitted to the first slide rail 703 through the first slider 702, causing the first slider 702 to slide along the first slide rail 703. Since the two outer frames 704 are fixedly connected by the connecting member 705, the movement of one outer frame 704 will drive the other outer frame 704 to move synchronously through the connecting member 705, thereby driving the other first slide rail 703, first slider 702, bump 701 and sliding groove 709, and then driving the lever 608 of the other adjusting mechanism 6 to move synchronously. By adjusting the position of the first slider 702 on the first slide rail 703, the relative position of the bump 701 in the sliding groove 709 can be changed, thereby finely adjusting the synchronous movement amplitude of the two levers 608 to adapt to different injection molding flow rate requirements. Since the two adjusting mechanisms 6 are arranged in the vertical direction, when the second slider 706 in the linkage mechanism 7 drives the two levers 608 during the lateral movement, the turning directions of the two levers 608 are opposite. Then, one adjusting mechanism 6 increases the flow rate and the other adjusting mechanism 6 decreases the flow rate. At the same time, the first slider 702 drives the bump 701 to move on the sliding groove 709. In this way, when the bump 701 moves horizontally for a certain distance at different positions on the sliding groove 709, the turning amplitude of the lever 608 will also change. That is to say, the turning amplitude of the lever 608 represents the flow rate adjustment range.

[0067] Among them, the user can control the movement strokes of the first slider 702 and the second slider 706 through an external controller, using a programmable logic controller (PLC) or an embedded microcontroller (such as the STM32 series). The controller is equipped with a user interface (for example, a touch screen or a keypad panel), allowing the user to input adjustment parameters (such as the moving distance or speed of the first slider 702 and the second slider 706). The controller communicates with the drive structures (linear motors) of the first slider 702 and the second slider 706 through a servo drive module, monitors the slider positions in real time, and performs fine-tuning operations. The adjustment accuracy of the controller is 0.1 mm, and the response time is less than 50 milliseconds. In a preferred embodiment, the controller integrates a feedback sensor (such as an optical encoder) for detecting the actual positions of the sliders and correcting deviations.

[0068] In this embodiment, the cooling mechanism 4 is used to cool the mold during the injection molding process to accelerate the plastic molding and improve the molding quality. In this embodiment, the cooling mechanism 4 includes a water tank 401, a pump body 402, a tee 403, two first connecting pipes 406, two electric ball valves 404, and two second connecting pipes 405. The structures, connection relationships, and functions of each component will be described in detail below.

[0069] The water tank 401 is a volumetric liquid storage container, fixed to the machine housing 1. The water tank 401 is connected to a preset mounting seat of the machine housing 1 through bolts or buckles, and the volume range is 50 - 200 liters. The interior of the water tank 401 is filled with a coolant (for example, distilled water or a mixture of water and antifreeze), and is equipped with a liquid level sensor and a temperature sensor for monitoring the liquid level and temperature of the coolant. The bottom of the water tank 401 is provided with an inlet and an outlet for replenishing the coolant and connecting to the pump body 402 respectively.

[0070] The pump body 402 is a centrifugal pump for driving the coolant to circulate. The input end of the pump body 402 is connected to the outlet of the water tank 401 through a flange, passing through the bottom of the water tank 401 to ensure smooth suction of the coolant. The output end of the pump body 402 is connected to the tee 403 through a threaded interface. The power range of the pump body 402 is 0.5 - 2 kW (preferably 1 kW), and the flow rate range is 10 - 50 liters per minute (preferably 30 liters per minute) to meet the mold cooling requirements.

[0071] The tee 403 is a tee pipe fitting with one inlet and two outlets. The inlet is hermetically connected to the output end of the pump body 402 through a thread or a flange, and the two outlets are respectively connected to the two first connecting pipes 406. The tee 403 is made of stainless steel or copper alloy, and the internal channel is designed to be streamlined to reduce the flow resistance of the coolant. The function of the tee 403 is to divide the coolant output by the pump body 402 into two paths and deliver them to the two cooling channels of the mold respectively.

[0072] The two first connecting pipes 406 are pressure-resistant hoses or hard pipes, respectively connecting the two outlets of the tee 403 and the inlets of the two electric ball valves 404. The inner diameter of the first connecting pipe 406 is 10 - 20 millimeters (preferably 15 millimeters), and it is made of high-temperature and corrosion-resistant materials (such as polytetrafluoroethylene or stainless steel) to adapt to the temperature and pressure of the coolant (the maximum working pressure is 0.5 - 1.0 MPa). The first connecting pipe 406 is hermetically connected to the tee 403 and the electric ball valve 404 through quick connectors or threaded interfaces.

[0073] The two electric ball valves 404 are respectively installed between the two first connecting pipes 406 and the two second connecting pipes 405 to regulate the flow rate of the coolant. Each electric ball valve 404 includes a valve body, a spherical valve core, and an electric actuator. The valve body is made of stainless steel, which is corrosion-resistant and high-temperature resistant. The electric actuator is driven by an external controller (for example, a PLC or a microcontroller) to control the opening degree of the valve core, and the adjustment range is 0 - 100% (the accuracy is 1%). The response time of the electric ball valve 404 is less than 1 second, and the rated pressure is 1.0 MPa. The electric ball valve 404 is connected to the first connecting pipe 406 and the second connecting pipe 405 through flanges or threads.

[0074] The two second connecting pipes 405 are pressure-resistant pipes, respectively connecting the outlets of the two electric ball valves 404 and the inlets of the cooling channels of the mold. The material and size of the second connecting pipe 405 are the same as those of the first connecting pipe 406. The second connecting pipe 405 is hermetically docked with the cooling channel of the mold through a quick connector to ensure that the coolant does not leak into the mold.

[0075] In actual use, the working process of the cooling mechanism 4 is as follows: The coolant in the water tank 401 is sucked in through the input end of the pump body 402, and the pump body 402 pressurizes the coolant and outputs it to the tee 403. The tee 403 divides the coolant into two paths, which respectively flow into the two electric ball valves 404 through the two first connecting pipes 406. The external controller adjusts the opening degrees of the two electric ball valves 404 according to the cooling requirements of the mold to precisely control the flow rate of each path of coolant (for example, 0 - 30 liters per minute). The coolant enters the cooling channels of the mold through the two second connecting pipes 405 to cool the mold and absorb the heat generated during the plastic molding process. Through the shunt cooling design of the cooling mechanism 4 and the precise flow control of the electric ball valve 404, the present invention can quickly reduce the mold temperature, shorten the molding cycle, and improve the surface quality and dimensional accuracy of the injection molded parts.

[0076] In this embodiment, the monitoring mechanism 8 is used to monitor the movement state of the lever 608 in the adjustment mechanism 6 to detect the change in the cross-sectional area of the hole body 609, thereby indirectly reflecting the adjustment of the molten plastic flow rate. In this embodiment, the structures of the two monitoring mechanisms 8 are the same. Each monitoring mechanism 8 includes a pressure sensor 801, a contact rod 802, two cylinders 803, a tension spring 804, and a clamping block 805. The structures, connection relationships, and functions of each component will be described in detail below.

[0077] The pressure sensor 801 is fixed to the machine housing 1 and is used to detect the pressure applied by the contact rod 802. The pressure sensor 801 is installed on the preset mounting seat of the machine housing 1 by bolts or buckles, and its monitoring end is a plane. The pressure sensor 801 is connected to an external controller through a wired interface (for example, RS-485 or 4-20mA signal) for transmitting pressure data. The installation position of the pressure sensor 801 corresponds to the movement trajectory of the lever 608 to ensure that the end of the contact rod 802 can accurately contact its monitoring end.

[0078] The contact rod 802 is a slender rod-shaped structure. One end of the contact rod 802 is a contact end that can contact the monitoring end of the pressure sensor 801; the other end is fixedly connected to the clamping block 805. The middle of the contact rod 802 is slidably connected through the sliding holes of the two cylinders 803 and can move freely along the axial direction of the cylinders 803. The surface of the contact end of the contact rod 802 is polished to reduce friction and wear when contacting the pressure sensor 801.

[0079] The two cylinders 803 are cylindrical structures and are fixed to the lever 608 of the adjustment mechanism 6. Each cylinder 803 is connected to the lever 608 by bolts or welding, and the axial direction of the cylinder 803 is parallel to the sliding direction of the contact rod 802. Through holes are processed on the contact rod 802, and the two cylinders 803 are arranged in the through holes of the contact rod 802. The contact rod 802 can slide along an arc trajectory through the limitation of the two cylinders 803.

[0080] The tension spring 804 is a tensile spring. One end of the tension spring 804 is fixed to the clamping block 805 through a hook ring, and the other end is fixed to the cylinder 803 near the clamping block 805 through a hook ring. When the contact end of the contact rod 802 contacts the monitoring end of the pressure sensor 801, the contact rod 802 slides relative to the two cylinders 803, driving the clamping block 805 to move, thereby stretching the tension spring 804 to generate a restoring force.

[0081] The clamping block 805 is a rectangular or circular block structure and is fixed to the non-contact end of the contact rod 802. The clamping block 805 is connected to the contact rod 802 by bolts or pins, and the material is the same as that of the contact rod 802. The clamping block 805 is provided with a hook ring or a hole for connecting the tension spring 804.

[0082] In actual use, the working process of the monitoring mechanism 8 is as follows: When the lever 608 of the adjusting mechanism 6 drives the movement through the linkage mechanism 7, indirectly driving the four adjusting blocks 606 to move and expand the cross-sectional area of the hole body 609, the two cylinders 803 on the lever 608 move synchronously with the lever 608. At this time, the contact end of the contact rod 802 gradually approaches the monitoring end of the pressure sensor 801. When the hole body 609 expands to a preset degree (for example, the cross-sectional area increases by 50%), the contact end of the contact rod 802 contacts the monitoring end of the pressure sensor 801, applying pressure. The contact rod 802 slides in the through hole of the cylinder 803, driving the latch 805 to move relative to the cylinder 803. The longer the relative movement between the contact rod 802 and the lever 608, the greater the stretching amplitude of the tension spring 804, the greater the elastic force generated, and the larger the value detected by the pressure sensor 801. At this time, the expansion degree of the hole body 609 is also greater. The pressure sensor 801 detects the contact pressure and transmits the pressure signal to an external controller. The controller judges the movement state of the lever 608 and the opening degree of the hole body 609 according to the pressure value, and then controls the opening amplitude of the electric ball valve 404. Through the pressure detection function of the monitoring mechanism 8, for example, when the lever 608 of the adjusting mechanism 6 drives the movement through the linkage mechanism 7, indirectly driving the four adjusting blocks 606 to move and expand the cross-sectional area of the hole body 609, at this time, the contact rod 802 on one side can contact the pressure sensor 801. The pressure sensor 801 judges the adjustment distance of the lever 608 at this time according to the stretching length of the tension spring 804, and controls the opening and closing amplitude of the corresponding electric ball valve 404 through the pressure change at this time (also synchronously reducing the amplitude of the other electric ball valve 404). The present invention can monitor the movement of the lever 608 and the adjustment state of the hole body 609 in real time, indirectly reflecting the change in the flow rate of the molten plastic. Furthermore, it realizes controlling the opening and closing amplitude of the electric ball valve 404 to reasonably distribute the injection amount of the refrigerant.

[0083] In addition, as Figure 11 shown, another embodiment of the present invention further provides a multi-cavity injection mold, which is applicable to the above-mentioned plastic injection device and is used to realize multi-cavity simultaneous injection molding to improve production efficiency and meet the molding requirements of plastic parts with different shapes. The multi-cavity injection mold of this embodiment includes a lower mold 10, an upper mold 11, two refrigerant channels 12, a first injection cavity 13, two injection ports 14, and a second injection cavity 15. The structures, connection relationships, and functions of each component will be described in detail below.

[0084] The lower mold 10 is the fixed part of the mold and is fixed to the housing 1 of the injection molding device by bolts or a clamping mechanism. Two refrigerant channels 12 are machined on the lower mold 10 for transporting coolant to reduce the mold temperature. Each refrigerant channel 12 is a serpentine or straight flow channel with an inner diameter of 8 - 15 mm and is hermetically connected to the second connecting pipe 405 of the cooling mechanism 4 through a quick connector. The inlet and outlet of the refrigerant channel 12 are respectively arranged on the side of the lower mold 10, and the inner part of the channel is polished to reduce the flow resistance of the coolant.

[0085] The upper mold 11 is connected to the driving mechanism 2 of the injection molding device, and the opening and closing of the mold with the lower mold 10 are realized through the driving mechanism 2. Two injection ports 14 are machined on the upper mold 11 for receiving the molten plastic conveyed by the guiding mechanism 5. Each injection port 14 is a circular or conical hole with a diameter of 3 - 10 mm and is connected to the first injection cavity 13 and the second injection cavity 15 through a flow channel. The inlet of the injection port 14 is docked with the nozzle assembly of the guiding mechanism 5 through a sealing joint to ensure that the molten plastic is injected without leakage.

[0086] The two refrigerant channels 12 respectively correspond to the first injection cavity 13 and the second injection cavity 15 and are machined inside the lower mold 10. The layout of the refrigerant channels 12 is optimized according to the shape and heat distribution of the injection cavity to ensure uniform cooling. The setting of the refrigerant channels 12 can quickly absorb the heat in the injection cavity and shorten the cooling time of the plastic part.

[0087] The two injection ports 14 respectively correspond to the first injection cavity 13 and the second injection cavity 15 and are machined on the upper mold 11. The flow channel of the injection port 14 is designed to be streamlined with a length of 20 - 50 mm to reduce the flow resistance and shear heat of the molten plastic. The injection port 14 receives two paths of molten plastic through the guiding mechanism 5 and injects them into the first injection cavity 13 and the second injection cavity 15 respectively to realize multi-cavity synchronous injection molding.

[0088] The first injection cavity 13 and the second injection cavity 15 are formed when the upper mold 11 and the lower mold 10 are closed, and are located in the cavity space between the upper mold 11 and the lower mold 10. The shapes of the first injection cavity 13 and the second injection cavity 15 are different to meet the molding requirements of different plastic parts. For example, the first injection cavity 13 can be a rectangular cavity (for molding flat parts), and the second injection cavity 15 can be a cylindrical cavity (for molding circular parts). The two injection cavities are respectively aligned with the corresponding injection ports 14 and refrigerant channels 12 to ensure the pertinence of the injection and cooling processes.

[0089] In actual use, the working process of the multi-cavity injection mold is as follows: The driving mechanism 2 drives the upper mold 11 and the lower mold 10 to close the mold, forming the first injection cavity 13 and the second injection cavity 15. The screw injection module 3 divides the molten plastic into two paths through the reducing tee 9 and the guiding mechanism 5, and injects them into the first injection cavity 13 and the second injection cavity 15 respectively through two injection ports 14. The adjusting mechanism 6 precisely controls the flow rates of the two paths of molten plastic by adjusting the cross-sectional area of the adjusting orifice body 609 to adapt to the different shape and volume requirements of the first injection cavity 13 and the second injection cavity 15. The linkage mechanism 7 synchronously drives the two adjusting mechanisms 6 to ensure the coordination of the flow rates of the two paths. The cooling mechanism 4 transports the coolant to the two refrigerant channels 12 through the pump body 402. The coolant enters the refrigerant channel 12 of the lower mold 10 through the first connecting pipe 406, the electric ball valve 404 and the second connecting pipe 405, and cools the first injection cavity 13 and the second injection cavity 15 specifically. The electric ball valve 404 adjusts the coolant flow rate according to the pressure signal of the monitoring mechanism 8 to ensure that the cooling efficiency matches the heat distribution of the injection cavity. After injection molding is completed, the driving mechanism 2 drives the upper mold 11 to open the mold, and the molded part is taken out to complete an injection molding cycle. Through the design of the multi-cavity injection mold, the present invention can simultaneously mold plastic parts with different shapes in a single injection molding cycle, improving production efficiency. The two injection ports 14 and the two refrigerant channels 12 correspond to the first injection cavity 13 and the second injection cavity 15 respectively, ensuring the independence and accuracy of the injection and cooling processes. The cooperation between the mold and the injection device (including the guiding mechanism 5, the adjusting mechanism 6, the linkage mechanism 7, the cooling mechanism 4 and the monitoring mechanism 8) realizes the dynamic adjustment of the flow rate of the molten plastic and the flow rate of the coolant, adapts to the complex molding requirements of the multi-cavity mold, and improves the dimensional accuracy and surface quality of the plastic part. In addition, the mold uses high-strength materials and an optimized runner design, extending the service life and reducing the maintenance cost.

[0090] In addition, another embodiment of the present invention also provides a method for a plastic injection device, including the following steps: Install the mold: Fix the lower mold 10 of the multi-cavity injection mold on the mold mounting seat of the machine housing 1 through bolts or a clamping mechanism, and ensure that the second connecting pipe 405 of the lower mold 10 and the cooling mechanism 4 are hermetically connected through a quick connector.

[0091] Connect the upper mold 11 to the transmission shaft or coupling of the driving mechanism 2, and ensure that the upper mold 11 can perform the mold opening and closing movement through the driving mechanism 2.

[0092] Check the cooling system: Open the water inlet of the water tank 401, inject the coolant (for example, distilled water or a mixture of water and antifreeze), and ensure that the liquid level reaches 80%-90% of the volume of the water tank 401 (about 40-180 liters).

[0093] Check whether the liquid level sensor and temperature sensor of the water tank 401 are working properly, and confirm that the coolant temperature is within the range of 10 - 25 °C.

[0094] Ensure that the connections of the pump body 402, the three-way joint 403, the first connecting pipe 406, the electric ball valve 404, and the second connecting pipe 405 are leak-free, and set the initial opening of the electric ball valve 404 to 50%.

[0095] Prepare plastic raw materials: Load plastic pellets (e.g., polypropylene or ABS) into the hopper of the screw injection molding module 3, filling it to 70% - 90% of the hopper capacity.

[0096] Check whether the heating device (electric heating coil) of the screw injection molding module 3 is normal, and preset the heating temperature to 180 - 250 °C (adjust according to the type of plastic material).

[0097] Check the adjustment and monitoring system: Confirm that the lever 608 of the two adjustment mechanisms 6 is in the initial position, and the cross-sectional area of the hole body 609 is at the intermediate value (e.g., 50% opening).

[0098] Check whether the bumps 701, the first slider 702, and the second slider 706 of the linkage mechanism 7 slide smoothly on the chute 709, the first slide rail 703, and the second slide rail 707 without jamming.

[0099] Start the external controller (PLC or embedded microcontroller), check whether the signal output of the pressure sensor 801 is normal, and confirm that the contact rod 802 of the monitoring mechanism 8 has no contact with the monitoring end of the pressure sensor 801.

[0100] Electrical and control system inspection: Connect the external controller to the power supply, initialize the servo motors of the first slider 702 and the second slider 706, and verify whether the feedback sensor (e.g., optical encoder) is working properly.

[0101] Power on: Turn on the main power switch of the injection molding device.

[0102] Initialize the external controller and load the preset injection molding program, including parameters such as injection speed, clamping force, and cooling time.

[0103] Preheat components: Start the heating device of the screw injection molding module 3 and preheat the plastic raw materials to the target temperature (e.g., 180 - 250 °C).

[0104] Start the pump body 402 to make the coolant circulate through the cooling mechanism 4, ensuring a stable flow rate in the refrigerant channel 12.

[0105] Trial run: Conduct a trial run of the driving mechanism 2 to ensure smooth opening and closing movements of the upper mold 11 and the lower mold 10.

[0106] Carry out a short-term trial injection molding to verify the flow of molten plastic through the reducing tee 9, the guiding mechanism 5, and the injection port 14.

[0107] Mold clamping: Use the driving mechanism 2 to drive the upper mold 11 to clamp with the lower mold 10 to form the first injection cavity 13 and the second injection cavity 15.

[0108] Apply a preset mold clamping force (e.g., 50 - 100 kN) to ensure a tight seal between the molds.

[0109] Plastic injection molding: Start the screw injection molding module 3. The screw rotates to melt the plastic particles and push them to the discharge end.

[0110] The molten plastic is divided into two paths through the reducing tee 9 and is injected into the injection ports 14 of the first injection cavity 13 and the second injection cavity 15 respectively via the joint 501 and the pipe body 502 of the guiding mechanism 5.

[0111] Flow rate adjustment: Adjust the first slider 702 and the second slider 706 through an external controller to move the position of the bump 701 in the chute 709 and finely adjust the rotation amplitude of the lever 608.

[0112] Adjust the two adjusting mechanisms 6 to control the cross-sectional area of the hole body 609 to ensure that the flow rate of each path of molten plastic meets the requirements of the injection cavity (e.g., 50% flow rate for each of the first injection cavity 13 and the second injection cavity 15 to achieve balanced filling).

[0113] The linkage mechanism 7 synchronously drives the two adjusting mechanisms 6 to ensure that when the flow rate of one path increases, the flow rate of the other path decreases, maintaining the total flow rate consistent.

[0114] Cooling process: After the first injection cavity 13 and the second injection cavity 15 are filled, the pump body 402 transports the coolant to the refrigerant channel 12 of the lower mold 10 through the first connecting pipe 406, the electric ball valve 404, and the second connecting pipe 405.

[0115] The electric ball valve 404 adjusts the coolant flow rate according to the pressure signal of the monitoring mechanism 8 to match the heat load of each injection cavity (e.g., 0 - 30 liters per minute for each path).

[0116] The monitoring mechanism 8 detects the movement state of the lever 608 through the pressure sensor 801 and controls the opening degree of the electric ball valve 404 according to the stretching degree of the tension spring 804 to ensure precise coolant distribution.

[0117] Real-time monitoring: Monitor the contact pressure of the pressure sensor 801, track the pressure change of the contact rod 802, and judge the opening degree of the hole body 609 and the plastic flow rate.

[0118] Through the interface of the external controller, observe the data such as the slider position, coolant flow rate, and mold temperature in real time.

[0119] Dynamic adjustment: If the pressure sensor 801 shows that the opening degree of a certain hole body 609 is too large (for example, >75% cross-sectional area), adjust the first slider 702, reposition the convex block 701, reduce the rotation amplitude of the lever 608, and balance the flow rate.

[0120] If the coolant temperature sensor shows uneven cooling (for example, the temperature of the first injection cavity 13 is lower than that of the second injection cavity 15), increase the opening degree of the corresponding electric ball valve 404 to enhance the coolant flow rate.

[0121] Feedback correction: The controller uses the feedback signal of the photoelectric encoder to correct the positioning deviation of the first slider 702 and the second slider 706, and maintain an adjustment accuracy of 0.1 mm.

[0122] Mold opening: After cooling is completed (for example, 10 - 30 seconds, depending on the plastic type and part thickness), start the drive mechanism 2 to open the upper mold 11 and separate it from the lower mold 10.

[0123] Part taking: Manually or use an automatic ejection system to take out the molded parts from the first injection cavity 13 and the second injection cavity 15.

[0124] Check whether the molded parts have defects (such as warping, incomplete filling), and adjust the injection or cooling parameters if necessary.

[0125] Cycle completion: Clean the first injection cavity 13, the second injection cavity 15, and the refrigerant channel 12 to remove residual plastic or debris, and prepare for the next cycle.

[0126] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plastic injection molding device, characterized in that, It includes a casing (1), a driving mechanism (2), a screw injection molding module (3), a reducing tee (9), a guiding mechanism (5) and two adjusting mechanisms (6); the driving mechanism (2) and the screw injection molding module (3) are connected to the casing (1), the driving mechanism (2) is used to drive the mold to move, the discharging end of the screw injection molding module (3) is connected to the reducing tee (9), the screw injection molding module (3) divides the molten plastic into two paths through the reducing tee (9) and injects the molten plastic into the mold through the guiding mechanism (5), and the two adjusting mechanisms (6) are respectively used to adjust the cross-sectional areas of the molten plastic in the two paths.

2. The plastic injection molding device according to claim 1, wherein The guiding mechanism (5) includes two connectors (501), two pipe bodies (502) and two brackets (503); The two connectors (501) are connected to the reducing tee (9), the two brackets (503) are respectively connected to the two pipe bodies (502) and the two connectors (501), the two brackets (503) are connected to each other, the two brackets (503) are connected to the casing (1), and the adjusting mechanism (6) is arranged between the connector (501) and the pipe body (502).

3. The plastic injection molding device according to claim 2, wherein, The two adjusting mechanisms (6) both include an arc plate (601), an inner ring (602), four toothed rings (603), four gears (604), four racks (605), four adjusting blocks (606), four limiting blocks (607), a lever (608), a hole body (609), four frame bodies (610) and an opening (611); The arc plate (601) is connected to the casing (1), the arc plate (601) is rotatably connected to the inner ring (602), the inner sides of the inner ring (602) are respectively connected to the four toothed rings (603), the four toothed rings (603) are respectively meshed and connected to the four gears (604), the four gears (604) are respectively meshed and connected to the four racks (605), the four racks (605) are respectively connected to the four adjusting blocks (606), the four adjusting blocks (606) are respectively slidably connected to the four limiting blocks (607), the four frame bodies (610) are respectively rotatably connected to the four gears (604), the four limiting blocks (607) and the four frame bodies (610) are both connected to the pipe body (502), and the lever (608) is connected to the inner ring (602); Wherein, the four adjusting blocks (606) are in contact with each other, the inner sides of the four adjusting blocks (606) enclose the hole body (609), and the hole body (609) is the channel for the molten plastic. Among them, the two arc-shaped plates (601) in the two adjusting mechanisms (6) are both processed with the openings (611), the two openings (611) are arranged at positions where the two arc-shaped plates (601) are close to each other, the dial rod (608) is connected to the inner ring (602), and the dial rod (608) can move inside the opening (611).

4. The plastic injection molding device according to claim 3, wherein, It further includes a linkage mechanism (7), and the linkage mechanism (7) is used to synchronously drive the two adjusting mechanisms (6) to move. The linkage mechanism (7) includes two bumps (701), two chutes (709), two first sliders (702), two first slide rails (703), two outer frames (704) and a connecting member (705); The two chutes (709) are respectively processed on the two dial rods (608), the two bumps (701) are respectively slidably connected to the two chutes (709), the two bumps (701) are respectively connected to the two first sliders (702), the two first sliders (702) are respectively slidably connected to the two first slide rails (703), the two first slide rails (703) are respectively connected to the two outer frames (704), and the two outer frames (704) are connected through the connecting member (705); The first slider (702) is used to adjust the position of the bump (701) in the chute (709).

5. The plastic injection molding device according to claim 4, characterized in that, The linkage mechanism (7) further includes a second slider (706), a second slide rail (707) and a frame (708); The connecting member (705) is connected to the second slider (706), the second slider (706) is slidably connected to the second slide rail (707), the second slide rail (707) is connected to the frame (708), the frame (708) is connected to the machine housing (1), and the second slider (706) can indirectly drive the bump (701) to move laterally.

6. The plastic injection molding device according to claim 4, characterized in that, It further includes a cooling mechanism (4), and the cooling mechanism (4) includes a water tank (401), a pump body (402), a three-way joint (403), two first connecting pipes (406), two electric ball valves (404) and two second connecting pipes (405); The water tank (401) is connected to the machine housing (1), the water tank (401) is connected to the pump body (402), the input end of the pump body (402) passes through the water tank (401), the output end of the pump body (402) is connected to the three-way joint (403), the three-way joint (403) is respectively connected to the two first connecting pipes (406), the two first connecting pipes (406) are respectively connected to the two electric ball valves (404), the two electric ball valves (404) are respectively connected to the two second connecting pipes (405), and the two second connecting pipes (405) are connected to the mold.

7. The plastic injection molding device according to claim 6, wherein, It further includes two monitoring mechanisms (8), and the monitoring mechanism (8) includes a pressure sensor (801), a contact rod (802), two cylinders (803), a tension spring (804) and a clamping block (805); The pressure sensor (801) is connected to the housing (1). The end of the contact rod (802) can contact the monitoring end of the pressure sensor (801). Two cylinders (803) are connected to the lever (608). The two cylinders (803) are slidably connected to the contact rod (802). The clamping block (805) is connected to the contact rod (802). Both ends of the tension spring (804) are respectively connected to the clamping block (805) and the cylinder (803). When the contact rod (802) contacts the monitoring end of the pressure sensor (801), relative movement occurs between the contact rod (802) and the two cylinders (803), driving the tension spring (804) to stretch; Among them, when the lever (608) indirectly drives the four adjusting blocks (606) to move and expand the hole body (609), the contact rod (802) on the lever (608) at this time can contact the monitoring end of the pressure sensor (801).

8. A multi-cavity injection mold, applied to the plastic injection device according to any one of claims 1 to 7, characterized in that, It includes a lower mold (10), an upper mold (11), two injection ports (14), a first injection cavity (13), a second injection cavity (15) and two refrigerant channels (12); Both of the two refrigerant channels (12) are machined on the lower mold (10). The two injection ports (14) are machined on the upper mold (11). When the upper mold (11) and the lower mold (10) are clamped, the first injection cavity (13) and the second injection cavity (15) are formed between the upper mold (11) and the lower mold (10). The shapes of the first injection cavity (13) and the second injection cavity (15) are different. The two injection ports (14) and the two refrigerant channels (12) respectively correspond to the first injection cavity (13) and the second injection cavity (15).

9. A method for a plastic injection molding device according to any one of claims 1 to 8, characterized in that, It includes the following steps: Install a multi-cavity injection mold, fix the lower mold (10) to the housing (1), connect the upper mold (11) to the driving mechanism (2), and connect the refrigerant channel (12) of the lower mold (10) to the second connecting pipe (405) of the cooling mechanism (4); Prepare the equipment, load plastic particles into the hopper of the screw injection module (3), inject coolant into the water tank (401), and check the initial states of the adjusting mechanism (6), the linkage mechanism (7) and the monitoring mechanism (8); Start the equipment, preheat the screw injection module (3) to 180 - 250 °C, and start the pump body (402) to circulate the coolant; Clamp the mold, drive the upper mold (11) and the lower mold (10) to be clamped through the driving mechanism (2) to form the first injection cavity (13) and the second injection cavity (15); Inject plastic, melt the plastic by the screw injection module (3), and inject the two-way molten plastic into the injection port (14) through the reducing tee (9) and the guiding mechanism (5); Adjust the flow rate, drive the first slider (702) and the second slider (706) of the linkage mechanism (7) through an external controller, adjust the lever (608) of the adjusting mechanism (6), control the cross-sectional area of the hole body (609), and synchronously adjust the flow rates of the two-way plastic; Cooling, the pump body (402) conveys the coolant through the refrigerant channel (12), and the pressure sensor (801) of the monitoring mechanism (8) detects the movement of the lever (608) to control the electric ball valve (404) to adjust the coolant flow rate; Mold opening and part taking, after cooling, the upper mold (11) is opened by the driving mechanism (2) to take out the molded part; Shutdown, turn off the heating device and the pump body (402), cut off the power supply and clean the mold.

10. The method of the plastic injection molding device according to claim 9, characterized in that, In the said flow rate adjustment, the linkage mechanism (7) adjusts the position of the convex block (701) in the chute (709) through the first slider (702), changes the rotation amplitude of the lever (608), realizes that when the plastic flow rate of one path increases, the other path decreases, keeps the total flow rate consistent, and the adjustment accuracy is 0.1 mm.

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