Injection molding equipment for plastic toy parts

Abstract

The invention belongs to the technical field of injection molding, and discloses plastic toy part injection molding equipment which comprises an injection molding machine barrel used for pushing plastic in a molten state; the mold set comprises a fixed mold plate and a movable mold plate, and the fixed mold plate and the movable mold plate are each provided with a plurality of mold cavities with different sizes and specifications; the guide pipes are mounted on the fixed mold plate, and each guide pipe is connected with one mold cavity; and the inlet ends of the guide pipes are connected to the change-over valve, the change-over valve is used for controlling the inlet end of one guide pipe to be opened, and the injection molding machine barrel pushes plastic into one guide pipe through the change-over valve and is guided into one cavity through the guide pipe. According to the injection molding equipment, the cavities of different specifications are formed in the same mold set, and the conversion valves and the guide pipes are selectively communicated for feeding, so that efficient, flexible and low-cost continuous production of toy parts of various specifications by single injection molding equipment is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to an injection molding device for plastic toy parts. Background Art

[0002] An injection molding machine, also known as an injection molding machine, is a type of industrial equipment that heats, plasticizes, and pressurizes thermoplastic or thermosetting plastics before injecting them into a mold cavity. Cooling and solidifying the plastics, the resulting product is a desired product. It is one of the most widely used and important molding machines in the plastics processing industry. Currently, injection molding machines are widely used in a variety of industries, including electronics, automotive, medical, packaging, daily necessities, and construction, resulting in products such as Lego blocks, children's toys, combs, and toothbrush handles.

[0003] During the injection molding process of toy parts, products come in a variety of sizes and specifications, and existing injection molding machines are unable to produce toy parts of multiple sizes with a single device. This often requires frequent replacement or adjustment of mold modules to accommodate the production of different models. This process results in lengthy mold changes and complex debugging, severely impacting injection molding production efficiency. While running multiple injection molding machines simultaneously and configuring dedicated molds and equipment for each specification can avoid frequent mold changes, it will lead to a significant increase in the number of devices, significantly increasing equipment investment and production operating costs. Therefore, improving efficiency and controlling costs while ensuring production flexibility has become a major challenge facing current toy injection molding production. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a plastic toy component injection molding device to solve the problems existing in the above background technology.

[0005] In order to solve the above technical problems, the technical solution of the present invention is a plastic toy component injection molding device, including an injection molding machine barrel, used to push molten plastic; a mold group, including a fixed template and a movable template, and the fixed template and the movable template are each provided with a plurality of cavities of different sizes; a plurality of conduits, the conduits are installed on the fixed template, and each of the conduits is connected to one of the cavities; a conversion valve, the inlet end of the conduit is connected to the conversion valve, and the conversion valve is used to control the opening of the inlet end of one of the conduits, and the injection molding machine barrel pushes the plastic through the conversion valve into one of the conduits, and is guided into one of the cavities through the conduit.

[0006] Preferably, the conversion valve comprises a base, the base is installed on the back of the fixed mold plate, a sliding groove is formed on the side of the base away from the fixed mold plate, the inlet end of the conduit is in communication with the inner wall of the sliding groove, and the inlet ends of the plurality of conduits are arranged equidistantly on the inner wall of the sliding groove in a ring shape; a rotating disc is movably installed in the sliding groove, and a through hole is formed in the rotating disc, the position of the through hole corresponds to the inlet end of the conduit.

[0007] Preferably, the plastic toy part injection molding equipment further comprises a driving device and a control device, the control device controls the driving device to start, so as to drive the conversion valve to act.

[0008] Preferably, the driving device comprises a first gear, a second gear, a chain and a motor, the first gear is fixedly arranged on the outside of the rotating disc, and the first gear is in transmission connection with the second gear through the chain, and the motor controls the rotation of the second gear.

[0009] Preferably, a leakage cavity is arranged between the injection molding machine barrel and the conversion valve; a leakage port is arranged at the bottom of the leakage cavity; an adjusting valve is arranged on the outside of the leakage cavity, and is used for adjusting the leakage flow of the leakage port.

[0010] Preferably, the adjusting valve comprises a ring body movably installed on the outside of the leakage cavity and a connecting rod used for fixedly connecting the ring body and the first gear; a plurality of subdivided holes with different radii are arranged in a ring shape on the ring body, and the positions of the subdivided holes are in the same vertical plane as the leakage port.

[0011] Preferably, a box body is arranged below the leakage cavity, and is used for storing the molten plastic discharged from the leakage cavity.

[0012] Preferably, the plastic toy part injection molding equipment further comprises a machine body and at least two positioning rods arranged on the machine body; the fixed mold plate is fixedly connected with the positioning rods through bolts; and the movable mold plate is slidably installed on the positioning rods.

[0013] Preferably, a limiting hole is formed in the center of the first gear, and the leakage cavity is clamped in the limiting hole.

[0014] Preferably, at least one heating module is arranged on the outer wall of the leakage cavity.

[0015] The technical effects of the present application mainly embody in the following aspects:

[0016] When a certain specification of toy parts needs to be produced, the operator sets the target cavity through the control system. After receiving the instruction, the switching valve only opens the inlet end of the conduit leading to the corresponding specification cavity, and the remaining conduits are closed. The molten plastic pushed by the injection molding machine barrel enters the selected conduit through the switching valve, and is then guided into the corresponding cavity. After the plastic cools and solidifies in the cavity, the desired part is formed, which can be removed after the mold is opened.

[0017] When another specification needs to be switched to production, the mold does not need to be replaced, and only the channel of the switching valve needs to be adjusted to switch to another conduit, and then the injection molding of the next specification can be started. The product specification is quickly switched without stopping, avoiding the time-consuming process of disassembling and assembling the mold, debugging and aligning in the traditional way, greatly shortening the mold changing time. Multiple specification cavities are integrated in the same mold set, reducing the equipment start-stop and preparation time. There is no need to configure independent injection molding machines or complete sets of molds for each specification, reducing equipment investment and floor space. The mold maintenance and management cost is also reduced accordingly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural diagram of the present application;

[0019] Figure 2 is Figure 1 the structure diagram of the middle conduit and the switching valve;

[0020] Figure 3 is a structural top view of the present application;

[0021] Figure 4 is Figure 3 the enlarged view of a in the figure;

[0022] Figure 5 is Figure 4 the structure diagram of the drainage cavity in the figure;

[0023] In the figure: 1, injection molding machine barrel; 2, mold set; 3, conduit; 4, switching valve; 6, drainage cavity; 7, control device; 8, machine body; 9, positioning rod; 21, fixed mold plate; 22, movable mold plate; 23, cavity; 41, base; 42, rotating disc; 51, first gear; 52, second gear; 53, chain; 54, motor; 61, drainage port; 62, regulating valve; 63, box body; 411, sliding groove; 421, through hole; 511, limiting hole; 601, heating module; 621, ring body; 622, connecting rod; 6211, subdivided hole. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application are described in further detail below with reference to the accompanying drawings, so that the technical solutions of the present application are easier to understand and master. In the embodiments, it should be understood that the terms "intermediate", "upper", "lower", "top", "right side", "left end", "upper", "back", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the present specific embodiments, the connection or fixing manner between components is not specifically described, and the connection or fixing manner can be bolted or pinned, or connected by a pin shaft, which is commonly used in the prior art. Therefore, in the present embodiments, it will not be described in detail.

[0025] Embodiment one

[0026] As shown in Figure 1 , Figure 3 and Figure 4 , a plastic toy part injection molding equipment, comprising an injection molding machine barrel 1 for pushing plastic in a molten state;

[0027] A mold set 2 comprising a fixed mold plate 21 and a movable mold plate 22, a plurality of cavities 23 of different sizes are provided on the fixed mold plate 21 and the movable mold plate 22; it should be noted that the cavities 23 can be of different shapes.

[0028] A plurality of conduits 3, the conduit 3 is installed on the fixed mold plate 21, each conduit 3 is connected to one cavity 23; specifically, one end of the conduit 3 is connected to the cavity 23, and the other end is connected to the switching valve 4. Through the conduit 3, the molten plastic can enter the cavity 23.

[0029] A switching valve 4, the inlet end of the conduit 3 is connected to the switching valve 4, the switching valve 4 is used to control the opening of the inlet end of one of the conduits 3, the injection molding machine barrel 1 pushes the plastic through the switching valve 4 into one of the conduits 3, and guides it into one of the cavities 23 through the conduit 3.

[0030] In the present embodiment, the injection molding machine barrel 1 is responsible for heating the plastic raw material to a molten state and providing pressure to push the molten material. The mold set 2 comprises a fixed mold plate 21 and a movable mold plate 22, which are integrated with a plurality of cavities 23 of different sizes, which can simultaneously accommodate the molding requirements of various toy parts. Each conduit is connected to one cavity 23, and the molten plastic passes from the switching valve 4 to the designated cavity 23. The switching valve 4 is installed between the injection molding machine barrel 1 and each conduit 3, and has a selective conduction function, which can control the flow direction of the molten material to one of the conduits 3.

[0031] When a certain specification of toy parts needs to be produced, the operator sets the target cavity 23 through the control system. After receiving the instruction, the switching valve 4 only opens the inlet end of the conduit 3 leading to the corresponding specification cavity 23, and the remaining conduits 3 are closed. The molten plastic pushed by the injection molding machine barrel 1 enters the selected conduit 3 through the switching valve 4, and is then guided into the corresponding cavity 23. After the plastic cools and solidifies in the cavity 23, the desired part is formed, which can be removed after the mold is opened. When another specification needs to be switched, there is no need to stop and replace the mold, just adjust the channel of the switching valve 4 to switch to another conduit 3, and the next specification injection can start. The product specification is quickly switched without stopping, avoiding the time-consuming process of disassembling and adjusting the mold in the traditional way, greatly shortening the mold changing time. Multiple specification cavities are integrated in the same mold set, reducing equipment start and preparation time. There is no need to configure independent injection molding machines or complete mold sets for each specification, reducing equipment investment and floor space. Mold maintenance and management costs are also reduced accordingly.

[0032] As shown in Figure 2 Further, the switching valve 4 includes a base 41 mounted on the back of the fixed mold plate 21, and a sliding groove 411 is opened on the side of the base 41 away from the fixed mold plate 21. The inlet end of the conduit 3 communicates with the inner wall of the sliding groove 411, and the inlet ends of multiple conduits 3 are arranged equidistantly on the inner wall of the sliding groove 411 in a ring shape. The ring equidistant layout facilitates high-precision angle positioning and automatic control.

[0033] A turntable 42 is movably mounted in the sliding groove 411, and a through hole 421 is opened on the turntable 42, the position of the through hole 421 corresponding to the inlet end of the conduit 3.

[0034] In this embodiment, the turntable 42 can rotate in the sliding groove 411, usually driven by a motor or a pneumatic device, realizing automatic control. The molten plastic output by the injection molding machine barrel 1 first enters one end of the sliding groove 411, but at this time it has not entered any conduit 3. The control system issues an instruction to drive the turntable 42 to rotate according to the current required production specification of the toy parts. The turntable 42 rotates to a predetermined angle, so that the through hole 421 accurately aligns with the inlet end of the target conduit 3. At this time, the molten plastic flows into the corresponding conduit 3 through the through hole 421 on the turntable 421, and finally is injected into the target cavity 23. When the specification needs to be switched, only the turntable 42 needs to be rotated to align the through hole 421 with the inlet end of the next conduit, so that the molten plastic can be quickly switched to the next specification.

[0035] The turntable 42 can be driven by a servo motor or a stepper motor, and combined with an encoder to realize precise positioning, which is easy to integrate into a PLC or MES system to realize fully automatic production scheduling. The mold changing process is simplified, and there is no need to disassemble the mold or replace parts, the mold changing time is shortened from tens of minutes to seconds, greatly improving the production rhythm.

[0036] Need to explain, in addition to the above examples, the conversion valve 4 can also be hydraulic / pneumatic multi-way valve, using hydraulic cylinder or air cylinder drive valve core movement, switching different flow channel, similar to the direction control valve in hydraulic system. Can also be, electric ball valve array, a plurality of electric ball valve in parallel, each connected to a catheter, control system to open the target ball valve, close the rest. Or, electromagnetic reversing valve group, similar to pneumatic solenoid valve, but for high temperature melt channel, through the solenoid control valve core position switching flow channel. And so on, such prior art is not described in detail.

[0037] Further, the plastic toy parts injection molding equipment also includes driving device and control device 7, the control device 7 control the driving device start, so as to drive the conversion valve 4 action.

[0038] Need to explain, in this embodiment, the control device 7 can be a PLC based automation control system, can also be a single chip microcomputer system, also can be a combination of PLC and HMI man-machine interface system. And so on, such prior art is not described in detail.

[0039] Further, the driving device includes first gear 51, second gear 52, chain 53 and motor 54, the first gear 51 is fixedly arranged on the outside of the rotating disc 42, and is drivenly connected with the second gear 52 through the chain 53, and the motor 54 controls the rotation of the second gear 52.

[0040] Need to explain, the first gear 51 is close to one side of the base 41 or the side of the base 41 close to the first gear 51, which can be optionally provided with a layer of damping pad, so as to avoid the excessive extrusion or excessive loose condition between the first gear 51 and the base 41, so that the relative movement between the first gear 51 and the base 41 is relatively gentle.

[0041] In this embodiment, when the motor 54 is started, the second gear 52 is driven to rotate, the chain 53 is driven, and the first gear 51 is rotated, and finally the rotating disc 42 is rotated in the sliding groove 411. By controlling the rotation direction and angle of the motor 54, such as using a servo motor and an encoder, the through hole 421 on the rotating disc 42 can be accurately controlled to align with the inlet end of which catheter 3, so as to realize automatic mold selection.

[0042] Need to explain, the driving device can also have a variety of alternative ways, for example, hydraulic motor through the shaft or gear connection rotating disc, using hydraulic power drive.

[0043] As Figure 5 , in combination Figure 1As shown, further, the injection molding machine barrel 1 and the switching valve 4 are provided with a leakage cavity 6; it should be noted that the switching valve 4 and the leakage cavity 6 can be designed as a layer structure for closely fitting the switching valve 4 and the leakage cavity 6, so as to avoid the molten plastic flowing out from the gap between the switching valve 4 and the leakage cavity 6 during the injection molding process; specifically, a layer of elastic sealing pad can be arranged on the side of the leakage cavity 6 close to the switching valve 4, or a layer of elastic sealing pad can be arranged on the side wall of the limiting hole 511, so that when the switching valve 4 and the leakage cavity 6 are clamped, a gap between the switching valve 4 and the leakage cavity 6 can be avoided.

[0044] The bottom of the leakage cavity 6 is provided with a leakage port 61 for discharging excess molten plastic.

[0045] The outer side of the leakage cavity 6 is provided with an adjusting valve 62 for adjusting the leakage flow of the leakage port 61.

[0046] In this embodiment, the amount of molten plastic pushed by the injection molding machine barrel 1 is the same each time, but the amount of molten plastic required to fill the cavity 23 of different specifications is different, so excess molten plastic needs to be discharged through the leakage cavity 6 to adapt to the injection molding of cavities 23 of different specifications. The adjusting valve 62 is installed on the outer side of the leakage cavity 6 to control the opening size of the leakage port 61, thereby adjusting the leakage flow.

[0047] It should be noted that the leakage cavity 6 and the matching adjusting valve 62 are mainly used to discharge or return the excess molten plastic output by the injection molding machine barrel when changing the mold, debugging or when the pressure is abnormal, so as to protect the system, prevent material mixing and stabilize the pressure. The device capable of realizing the functions of excess molten material treatment, pressure release, flow channel switching buffer, etc. can also be other structures or mechanisms, for example, a closed-loop return channel is arranged to guide the unused molten material back to the front end of the barrel or a special storage cylinder to realize cyclic utilization. Or a closable needle valve is arranged at the end of the main flow path, when not injecting, the needle valve is closed to prevent molten material from flowing out, and excess pressure is absorbed by the internal buffer of the system.

[0048] Further, the adjusting valve 62 includes a ring body 621 movably installed on the outer side of the leakage cavity 6 and a connecting rod 622 for fixedly connecting the ring body 621 and the first gear 51.

[0049] A plurality of subdivided holes 6211 with different radii are arranged in a ring shape on the ring body 621, and the positions of the subdivided holes 6211 are in the same vertical plane as the leakage port 61. It should be noted that the diameter of the subdivided hole 6211 is not greater than the diameter of the leakage port 61. The number of subdivided holes 6211 and the size of the diameter change can be designed during production, which is not limited here.

[0050] In this embodiment, the first gear 51 rotates under the drive of the motor 54, driving the turntable 42 to rotate and switch to the inlet end of the different conduits 3; at the same time, the rotational motion of the first gear 51 is transmitted to the ring body 621 through the connecting rod 622, so that the ring body 621 rotates synchronously therewith.

[0051] As the ring 621 rotates, its multiple subdivided holes 6211 of varying radii sequentially pass through the drain port 61. Due to the varying radius of each through-hole, the overlap area with the drain port 61 varies, resulting in varying cross-sectional areas for flow: through-holes with larger radii have greater overlap with the drain port, resulting in greater leakage; through-holes with smaller radii have less overlap and less leakage. Without the need for an additional control system, the regulating valve 62 automatically adjusts with mold changes, ensuring that the leakage conditions after each mold change match the current process.

[0052] Furthermore, a box 63 is provided below the discharge cavity 6 to store the molten plastic discharged from the discharge cavity 6, which can be reused in the injection molding equipment to avoid waste of production materials. It should be noted that the box 63 can be connected to the feeding funnel by adding a pipe, and the molten plastic can be forced to flow back to the feeding funnel through the pipe through existing pressure methods such as hydraulic pressure to achieve material recycling.

[0053] Furthermore, the plastic toy component injection molding device further comprises a body 8 and at least two positioning rods 9 provided on the body 8 and arranged in parallel to serve as guide rails for the movement of the template.

[0054] The fixed plate 21 is fixed to the positioning rod 9 by bolts, and the fixed plate 21 in the fixed mold set 2 is directly locked and fixed to the positioning rod 9 by bolts, so that the position remains unchanged during the working process. At the same time, it can also be disassembled.

[0055] The movable platen 22 is slidably mounted on the positioning rods 9. During the mold closing process, the drive mechanism pushes the movable platen 22, causing it to slide along the positioning rods 9 toward the fixed platen 21. When the movable platen 22 and the fixed platen 21 are closed, the multiple cavities 23 between them form a complete, closed mold cavity, ready for injection molding. Mold opening and part removal: The drive mechanism reverses, pulling the movable platen 22 back along the positioning rods 9 to open the mold. The molded part is ejected from the movable platen 22 and removed.

[0056] Furthermore, a limiting hole 511 is provided at the center of the first gear 51 , and the discharge cavity 6 is clamped in the limiting hole 511 .

[0057] In the embodiment, the leakage cavity 6 is only clamped in the limiting hole 511, when the bolt between the positioning rod 9 and the fixed mold plate 21 is loosened, the fixed mold plate 21 is moved to remove the clamping state of the leakage cavity 6 and the limiting hole 511, the conversion valve 4 is horizontally moved out, and the inside of the conversion valve 4 and the leakage cavity 6 can be cleaned.

[0058] Further, the outer wall of the leakage cavity 6 is provided with at least one heating module 601. Avoiding the solidification of plastic in the leakage cavity 6, blocking the conduit 3.

[0059] In the embodiment, the heating module is a key component for realizing the transition of the plastic raw material from solid state to molten state, which is usually integrated in the inside or outside of the injection molding machine barrel 1, and is used for heating and plasticizing the plastic particles. In addition to the commonly understood "resistance heating ring", according to the technical development and application requirements, the heating module here can also be other forms, for example, resistance heating ring, using resistance wire to generate heat by electrification, heating the outer wall of the machine cylinder through heat conduction, and then transferring to the internal plastic. Or, electromagnetic induction heater, winding coil outside the machine cylinder, inputting high-frequency alternating current to generate alternating magnetic field, generating eddy current in the metal machine cylinder to generate heat by itself. Or, infrared radiation heating module, using infrared radiation elements to emit infrared rays to directly heat the plastic material, such as quartz tube, ceramic infrared.

[0060] Of course, the above is only a typical example of the present application, in addition to this, the present application can have other various specific embodiments, and any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of the present application.

Claims

1. A plastic toy parts injection molding device, characterized in that: include Injection molding machine barrel, used to push molten plastic; The mold set includes a fixed mold plate and a movable mold plate, wherein the fixed mold plate and the movable mold plate are both provided with a plurality of mold cavities of different sizes; A plurality of conduits, each of which is connected to one of the cavities; A conversion valve, the inlet end of the conduit is connected to the conversion valve, and the conversion valve is used to control the opening of the inlet end of one of the conduits. The injection molding machine barrel pushes the plastic through the conversion valve into one of the conduits, and is guided into one of the mold cavities through the conduit.

2. The plastic toy component injection molding equipment according to claim 1, characterized in that: The switching valve includes A base, the base being mounted on the back of the fixed template, a chute being provided on a side of the base away from the fixed template, the inlet end of the conduit being communicated with the inner wall of the chute, and the inlet ends of the plurality of conduits being equidistantly arranged in a ring on the inner wall of the chute; A turntable is movably installed in the slide groove, and a through hole is opened on the turntable, and the position of the through hole corresponds to the inlet end of the conduit.

3. The plastic toy component injection molding equipment as claimed in claim 2, characterized in that: The plastic toy component injection molding equipment further includes a driving device and a control device. The control device controls the driving device to start, thereby driving the conversion valve to operate.

4. The plastic toy component injection molding equipment as claimed in claim 3, characterized in that: The driving device includes a first gear, a second gear, a chain and a motor; The first gear is fixedly arranged on the outer side of the turntable and is transmission-connected to the second gear through the chain. The motor controls the rotation of the second gear.

5. The plastic toy component injection molding equipment as claimed in claim 4, characterized in that: A discharge cavity is provided between the injection molding machine barrel and the conversion valve; The bottom of the discharge cavity is provided with a discharge port; A regulating valve is provided on the outside of the discharge cavity for regulating the discharge flow of the discharge port.

6. The plastic toy component injection molding equipment as claimed in claim 5, characterized in that: The regulating valve includes a ring body movably mounted outside the discharge cavity and a connecting rod for fixedly connecting the ring body and the first gear; A plurality of subdivided holes with different radii are arranged in an annular pattern on the ring body, and the positions of the subdivided holes and the drain port are in the same vertical plane.

7. The plastic toy component injection molding equipment as claimed in claim 5, characterized in that: A box is provided below the discharge cavity for storing the molten plastic discharged from the discharge cavity.

8. The plastic toy component injection molding equipment as claimed in claim 5, characterized in that: The plastic toy component injection molding device further comprises a body and at least two positioning rods arranged on the body; The fixed template is fixed to the positioning rod by bolts; The movable template is slidably mounted on the positioning rod.

9. The plastic toy component injection molding device according to claim 8, characterized in that: A limiting hole is provided at the center of the first gear, and the flow discharge cavity is clamped in the limiting hole.

10. The plastic toy component injection molding equipment as claimed in claim 5, characterized in that: At least one heating module is provided on the outer wall of the drainage cavity.

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