Overflow-proof plastic injection molding device and method

Abstract

The present invention relates to the field of injection molding technology, and more specifically, to an anti-overflow plastic injection molding device and method. The device comprises a base, a blanking piece is provided at the top of the base near one end thereof, a vertical plate is fixedly connected to the top of the base near the middle thereof, an injection molding assembly is provided between the vertical plate and the blanking piece, a molding assembly is provided between the outer wall of the vertical plate on the side away from the blanking piece and the top of the base; the molding assembly comprises a mold, the mold is fixedly connected to the outer wall of the vertical plate on the side away from the blanking piece; a compression molding assembly is provided at one end of the top of the base away from the blanking piece, the compression molding assembly comprises a compression molding head, and the compression molding head is movably connected to the inside of the mold; the injection molding assembly is used to extrude the material in the blanking piece into the inside of the mold, the molding assembly is used to cool the high-temperature material, the compression molding head is used to extrude the material inside the mold, the material inside the mold expands at a high temperature and pushes the compression molding head to contract, and the contraction force of the compression molding head increases the cooling rate of the molding assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, in particular to an overflow-proof plastic injection molding device and method. Background Art

[0002] An injection molding machine is a primary molding device used to convert thermoplastics or thermosetting plastics into various shapes using plastic molding molds. The operating principle of an injection molding machine is a cyclic process. First, plastic granules or powder are fed from a hopper into a heated barrel for quantitative feeding. The barrel is then heated and the screw rotates to melt and plasticize the plastic. Then, driven by the injection cylinder piston, the screw injects the molten plastic through a nozzle at high pressure and speed into the closed mold cavity. The plastic in the cavity then cools, changing from a viscous flow state to a solid state. Finally, the mold is opened and the product is removed by the ejector, completing one injection molding cycle. This cycle then repeats, requiring all systems to work in concert.

[0003] In existing plastic injection molding, different plastic materials will expand to a large extent during the heating process. If the thermal expansion characteristics of the material are not adequately considered during the injection molding process, when the plastic melt is heated to a high temperature, its volume expansion may exceed the accommodation range of the mold cavity, resulting in overflow from parts such as the parting surface; at the same time, for some plastics with added special fillers or additives, their thermal expansion behavior may also change; for example, plastics with added reinforcing materials such as glass fiber may produce uneven expansion when heated due to the thermal expansion differences of each component, thereby increasing the risk of overflow.

[0004] In view of this, the present invention provides an overflow-proof plastic injection molding device and method. Summary of the Invention

[0005] The object of the present invention is to provide an overflow-proof plastic injection molding device and method to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, one of the objectives of the present invention is to provide an anti-overflow plastic injection molding device, comprising a base, a blanking piece is provided on the top of the base near one end thereof, a vertical plate is fixedly connected to the top of the base near the middle thereof, an injection molding assembly is provided between the vertical plate and the blanking piece, and a molding assembly is provided between the outer wall of the vertical plate on a side away from the blanking piece and the top of the base;

[0007] The molding assembly includes a mold, which is fixedly connected to the outer wall of the vertical plate on the side away from the blanking piece; a compression molding assembly is provided at the end of the top of the base away from the blanking piece, and the compression molding assembly includes a compression molding head, which is movably connected to the inside of the mold;

[0008] The injection molding component is used to extrude the material in the blank into the mold, the molding component is used to cool the high-temperature material, and the compression molding head is used to extrude the material inside the mold. The material inside the mold expands under high temperature conditions and pushes the compression molding head to contract. The contraction force of the compression molding head increases the cooling speed of the molding component.

[0009] As a further improvement of this technical solution, the injection molding assembly includes an injection molding tube, which is fixedly connected to the inside of the blanking part. The end of the injection molding tube away from the vertical plate is fixedly connected to an injection molding machine. A screw is provided inside the injection molding machine, and the screw is located inside the injection molding tube.

[0010] As a further improvement of the present technical solution, the molding assembly further includes a circulation pump, which is fixedly connected to the top of the base at the bottom of the injection tube, and two hoses are fixedly connected between the circulation pump and the mold.

[0011] As a further improvement of the present technical solution, the compression molding assembly further comprises a support plate, the support plate being fixedly connected to one end of the top of the base away from the blanking piece, and a cylinder being fixedly connected inside the support plate.

[0012] As a further improvement of this technical solution, the end of the cylinder piston rod is fixedly connected to a compression molding head, and guide columns are provided between the support plate and the vertical plate near the four corners, and the compression molding head is movably connected between the outer walls of the four guide columns.

[0013] As a further improvement of this technical solution, the compression molding head includes a fixed plate, which is fixedly connected to the end of the cylinder piston rod. A pressure plate is provided between the fixed plate and the inside of the mold, and an elastic member is fixedly connected between the pressure plate and the fixed plate.

[0014] A second object of the present invention is to provide a method for operating an anti-overflow plastic injection molding device according to any one of the above, comprising the following method steps:

[0015] S1. First, the injection molding component is started to fully mix and stir the materials inside the blank, and then heated at high temperature, and the materials are punched into the mold through the injection molding component;

[0016] S2. The compression molding head is pressed into the mold by the expansion and contraction of the compression molding component. When the material inside the mold expands, the compression molding head is driven to contract.

[0017] S3. When the compression head shrinks, the cooling speed of the molding component will be accelerated, and the expanded material inside the mold will be cooled and shrunk to prevent the material inside the mold from expanding too quickly and causing overflow;

[0018] S4. When the material inside the mold shrinks due to cooling and slowing down of the injection molding flow rate, the compression molding head will rebound and continue to press inside the mold, increasing the cooling speed and speeding up the injection molding flow rate, making it convenient to continue to press the material into the mold. This reciprocating process ensures the quality of plastic injection molding.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the overflow-proof plastic injection molding device and method, when a material in a high-temperature expansion state is input into the mold, if its expansion exceeds the mold's accommodation range, a strong thrust will be generated; this thrust will act on the compression molding head, causing the compression molding head to contract; this contraction force will increase the distance between the compression molding head and the mold. Due to the circulation characteristics of the coolant in the molding assembly, the increase in the distance between the compression molding head and the mold means that the coolant circulation distance also increases, greatly improving the cooling speed of the molding assembly.

[0021] 2. In the anti-overflow plastic injection molding device and method, when the material shrinks due to cooling inside the mold, the compression molding head will rebound under the action of the elastic restoring force, and the compression molding head will appropriately squeeze the material; this squeezing action will gradually reduce the distance between the compression molding head and the mold, thereby slowing down the cooling speed; it is convenient to automatically and accurately adjust the cooling speed of the molding component according to the degree of expansion of the material during the injection molding process, effectively avoiding the occurrence of material overflow during the entire molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 Schematic diagram of the injection molding structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the slow cooling structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the rapid cooling structure of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the injection molding component of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the molding assembly of the present invention;

[0028] Figure 7 Schematic diagram of the compression molding component structure of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the compression molding head of the present invention.

[0030] The meaning of each number in the figure is:

[0031] 1. Base; 11. Blanking parts;

[0032] 12. Injection molding assembly; 120. Injection molding tube; 121. Screw; 122. Injection molding machine;

[0033] 13. Molding assembly; 130. Mold; 131. Hose; 132. Circulation pump;

[0034] 14. Compression molding assembly; 140. Support plate; 141. Cylinder; 142. Guide column; 143. Compression molding head; 1430. Fixed plate; 1431. Pressing plate; 1432. Elastic member;

[0035] 15. Vertical board. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] Example 1, please refer to Figure 1-Figure 4 As shown, the present embodiment aims to provide an overflow-proof plastic injection molding device, comprising a base 1, a blanking piece 11 being provided on the top of the base 1 near one end thereof, a vertical plate 15 being fixedly connected to the top of the base 1 near the middle thereof, an injection molding assembly 12 being provided between the vertical plate 15 and the blanking piece 11, and a molding assembly 13 being provided between the outer wall of the vertical plate 15 on a side away from the blanking piece 11 and the top of the base 1;

[0039] The molding assembly 13 includes a mold 130, which is fixedly connected to the outer wall of the vertical plate 15 on the side away from the blank 11. A compression molding assembly 14 is provided at the end of the top of the base 1 away from the blank 11. The compression molding assembly 14 includes a compression molding head 143, which is movably connected to the interior of the mold 130.

[0040] The injection molding component 12 is used to extrude the material in the blank 11 into the mold 130, the molding component 13 is used to cool the high-temperature material, and the compression molding head 143 is used to extrude the material inside the mold 130. The material inside the mold 130 expands under high temperature conditions, pushing the compression molding head 143 to contract. The contraction force of the compression molding head 143 increases the cooling speed of the molding component 13.

[0041] The improvement of this embodiment is that during the injection molding process, the injection molding assembly 12 first stirs the material in the lower part 11 and then transports the material into the mold 130. Since the injection molding material needs to be heated at high temperature during stirring and mixing, the material tends to expand at high temperature. When the expanded material enters the mold 130, it pushes the compression molding head 143 to contract.

[0042] When the compression molding head 143 contracts due to the expansion of the material, the distance between the compression molding head 143 and the mold 130 increases, which increases the coolant flow distance of the molding assembly 13, thereby increasing the cooling speed of the molding assembly 13 and accelerating the cooling of the material in the mold 130. After the material cools, the expansion degree is reduced and it contracts, avoiding overflow due to expansion.

[0043] When the material cools and shrinks, the compression molding head 143 rebounds to extrude the material, reducing the distance between the compression molding head 143 and the mold 130, thereby reducing the cooling rate of the molding component 13, avoiding excessive cooling of the material before the injection molding is complete, and facilitating continuous injection molding into the mold 130; in this way, the cooling rate and injection flow rate can be adjusted according to the degree of material expansion to prevent material overflow during the molding process.

[0044] First, the specific structure of the injection molding assembly 12 is disclosed. The injection molding assembly 12 includes an injection molding tube 120. The injection molding tube 120 is fixedly connected to the interior of the blanking member 11. The end of the injection molding tube 120 away from the vertical plate 15 is fixedly connected to an injection molding machine 122. The injection molding machine 122 is provided with a screw 121 inside. The screw 121 is located inside the injection molding tube 120.

[0045] See Figure 5 As shown, the working principle of the rotation of the screw 121 of the injection molding machine 122 is known to those skilled in the art. The motor is powered by a motor or other power device. The motor is connected to the screw 121 through a transmission device (such as a belt drive, a gear drive, etc.), and the rotational power is transmitted to the screw 121, causing the screw 121 to rotate in the injection tube 120.

[0046] As the screw 121 continues to rotate, the plastic entering the screw groove will be continuously pushed forward, and in the process of conveying the plastic forward, the screw 121 will also compact the plastic; the gap between the screw 121 and the injection tube 120 is very small. When the plastic passes through this gap, it will be squeezed, thereby increasing the density of the plastic and becoming denser; under the rotation and pushing action of the screw 121, the plastic is continuously sheared, rubbed and heated in the injection tube 120, gradually changing from a solid state to a molten state, completing the plasticizing process; when the plastic is completely plasticized, the screw 121, under the action of the thrust of the injection cylinder piston, injects the molten plastic in the storage chamber into the interior of the mold 130 through the injection head at high speed and high pressure; during the injection process, the screw 121 will continue to advance forward, filling the entire cavity with the molten plastic until the injection is completed.

[0047] Next, the specific structure of the molding assembly 13 is disclosed. The molding assembly 13 also includes a circulation pump 132. The circulation pump 132 is fixedly connected to the top of the base 1 and located at the bottom of the injection tube 120. Two hoses 131 are fixedly connected between the circulation pump 132 and the mold 130.

[0048] See Figure 6 As shown, the mold 130 is connected to the circulation pump 132 through two hoses 131. The circulation pump 132 circulates the coolant inside the mold 130 to maintain the cooling temperature inside the mold 130. The working principle of the circulation pump 132 is well known to those skilled in the art. When the circulation pump 132 is working, the pump body is first filled with coolant before starting. After starting, the motor drives the impeller to rotate at high speed, so that the coolant is thrown to the periphery of the impeller by centrifugal force to form a high-pressure area and the center of the impeller to form a low-pressure area. Under the pressure difference between the inlet and the outlet, the coolant is sucked in from the inlet and discharged from the outlet after being accelerated and pressurized by the impeller. The motor continues to operate to realize the continuous circulation of the coolant in the system, and forms a cooling system with the radiator and the like to remove heat.

[0049] Therefore, the coolant inside the circulation pump 132 is transported to the inside of the mold 130 through one of the hoses 131, and the circulating liquid inside the mold 130 is extracted through the other hose 131, so that the coolant circulates back and forth inside the mold 130, so that the mold 130 is always in a low temperature state.

[0050] Finally, the specific structure of the compression molding assembly 14 is disclosed. The compression molding assembly 14 also includes a support plate 140, which is fixedly connected to the top end of the base 1 away from the blanking member 11. A cylinder 141 is fixedly connected to the interior of the support plate 140; a compression molding head 143 is fixedly connected to the end of the piston rod of the cylinder 141. Guide pillars 142 are provided near the four corners between the support plate 140 and the vertical plate 15. The compression molding head 143 is movably connected between the outer walls of the four guide pillars 142.

[0051] See Figure 7 As shown, the piston rod of the cylinder 141 pushes the compression molding head 143 to move on the top of the base 1, and the compression molding head 143 is die-casted into the mold 130; the cylinder 141 is supported by the support plate 140, and the guide column 142 provides stability for the movement of the compression molding head 143.

[0052] The compression molding head 143 includes a fixed plate 1430, which is fixedly connected to the end of the piston rod of the cylinder 141. A pressing plate 1431 is provided between the fixed plate 1430 and the inside of the mold 130. An elastic member 1432 is fixedly connected between the pressing plate 1431 and the fixed plate 1430.

[0053] See Figure 8 As shown, by calculating the required plastic thickness, the cylinder 141 drives the fixed plate 1430 to move to the corresponding position. Then, the pressing plate 1431 moves closer to the inside of the mold 130 under the elastic force of the elastic member 1432, thereby squeezing the plastic inside the mold 130. When the material inside the mold 130 expands under high temperature, the expansion force pushes the pressing plate 1431 toward the fixed plate 1430, causing the elastic member 1432 to contract. When the pressing plate 1431 moves outward from the inside of the mold 130, the distance between the pressing plate 1431 and the end of the mold 130 increases.

[0054] See Figure 3 and Figure 4 As shown, at this time, the hose 131 located between the pressing plate 1431 and the mold 130 expands and contracts, thereby increasing the opening of the hose 131, making the coolant flow faster inside the hose 131, accelerating the circulation speed of the coolant inside the mold 130, and thus making the mold 130 cool the plastic inside it faster; by accelerating the cooling of the expanded plastic, the expansion force of the plastic is weakened, and the plastic begins to contract, which facilitates the continuous injection of plastic into the mold 130 and ensures the quality of the plastic after molding;

[0055] Furthermore, during the injection molding process, the pressure plate 1431, under the action of the elastic member 1432, continuously applies extrusion pressure to the material inside the mold 130, making the filling of the plastic melt in the mold cavity of the mold 130 a dynamic process. When the melt initially enters the mold cavity, air may be entrained for various reasons, forming bubble nuclei. By continuously applying pressure, the melt is continuously compacted in the mold cavity, just like squeezing a sponge with force, squeezing out the air therein, thereby reducing the presence of bubble nuclei and, in turn, the possibility of bubble generation. At the same time, the continuous pressure can keep the melt in a compact state, making the distance between plastic molecules smaller and their arrangement more dense and orderly, making it difficult for gas to form stable bubbles in it.

[0056] The strength and toughness of the plastic product injected in the mold 130 are enhanced, and the dimensional stability is improved, so that the product can withstand greater external forces and has higher dimensional accuracy; at the same time, the scrap rate and production costs can be reduced, waste generation can be reduced, production efficiency can be improved, and waste of raw materials can be avoided.

[0057] Example 2: This example is based on the content provided in Example 1, and aims to provide a method for an overflow-proof plastic injection molding device. The specific steps are as follows:

[0058] S1. The injection molding machine 122 drives the screw 121 to rotate continuously within the injection tube 120, continuously pushing the plastic particles entering the screw groove forward. During this process, the plastic is subjected to shear forces and friction forces from all directions in the relatively closed space of the injection tube 120, while also continuously absorbing heat. These complex interactions intertwine and gradually change the physical state of the plastic, from an initial solid state to a molten state little by little, until the entire plasticization process is completed. When the plastic is fully plasticized, the screw 121, driven by the powerful thrust of the injection cylinder piston, injects the molten plastic stored in the storage chamber into the interior of the mold 130 at extremely high speed and pressure.

[0059] S2. The coolant in the circulating pump 132 is delivered to the mold 130 through one of the hoses 131, so that the coolant shuttles through the mold 130 to remove heat; then, the circulating liquid in the mold 130 is pumped out through the other hose 131. This cycle is repeated so that the mold 130 can always be kept at a low temperature, providing a stable environment for the injection molding process.

[0060] S3. After accurately calculating the required plastic thickness, the cylinder 141 drives the fixed plate 1430 to move smoothly to the corresponding position. Then, under the elastic force of the elastic member 1432, the pressing plate 1431 slowly approaches the interior of the mold 130, thereby precisely squeezing the plastic inside the mold 130. During this process, the support plate 140 firmly supports the cylinder 141 to ensure its stability during operation, while the guide column 142 provides a reliable guide for the movement of the compression head 143, making its movement more stable and accurate.

[0061] S4. When the material inside the mold 130 expands under high temperature, the strong force generated by the expansion pushes the pressing plate 1431 toward the fixed plate 1430, causing the elastic member 1432 to contract. As the pressing plate 1431 moves outward from the inside of the mold 130, the distance between the pressing plate 1431 and the end of the mold 130 gradually increases. At this time, the hose 131 compressed between the pressing plate 1431 and the mold 130 expands due to the increase in the distance between the pressing plate 1431 and the mold 130, and its opening increases as it expands, causing the flow rate of the coolant inside the hose 131 to be greatly accelerated. This accelerated flow of coolant also accelerates the circulation rate of the coolant inside the mold 130, thereby allowing the mold 130 to cool the plastic inside it faster. By this rapid cooling of the plastic, the expansion force of the plastic is effectively weakened, and the expanded plastic begins to contract. In this way, the plastic can be continuously injected into the mold 130, ensuring the quality of the plastic after molding and making it more in line with production requirements.

[0062] S5. When the material inside the mold 130 pushes the pressing plate 1431 in an expanded state, it not only increases the cooling rate of the mold 130 but also reduces the flow rate of the injected material, thereby effectively alleviating the area occupied by the expanded material inside the mold 130.

[0063] S6. As the material gradually cools in the mold 130, the expanded portion of the material begins to shrink, leaving space inside the mold 130. Under the elastic action of the elastic member 1432, the pressing plate 1431 rebounds and is held within the mold 130. This action causes the hose 131 to be clamped between the mold 130 and the pressing plate 1431 again, reducing the cross-sectional area of ​​the hose 131. This reduces the circulation speed of the coolant inside the mold 130, and the cooling speed of the mold 130 is also reduced accordingly, preventing the material from being completely cooled before the injection molding is complete.

[0064] S7. During the injection molding process, the material is continuously transported into the mold 130 to ensure a stable supply of material, and the cooling rate is intelligently and adaptively adjusted according to the degree of its expansion. Moreover, during the process of the pressing plate 1431 squeezing the mold 130, it is ensured that a stable pressure is continuously applied to the material being injected into the mold 130, and the air originally existing in the mold 130 is effectively squeezed out, which can greatly reduce the generation of bubbles during the injection molding process, enhance the strength and toughness of the product, and improve the dimensional stability of the product, thereby ensuring that the product quality meets high standards.

[0065] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-overflow plastic injection molding device, comprising a base (1), characterized in that: A blanking piece (11) is provided at the top of the base (1) near one end thereof, a vertical plate (15) is fixedly connected to the top of the base (1) near the middle thereof, an injection molding component (12) is provided between the vertical plate (15) and the blanking piece (11), and a molding component (13) is provided between the outer wall of the vertical plate (15) on a side away from the blanking piece (11) and the top of the base (1); The molding assembly (13) includes a mold (130), and the mold (130) is fixedly connected to the outer wall of the vertical plate (15) on a side away from the blanking piece (11); a compression molding assembly (14) is provided at one end of the top of the base (1) away from the blanking piece (11), and the compression molding assembly (14) includes a compression molding head (143), and the compression molding head (143) is movably connected to the inside of the mold (130); The injection molding component (12) is used to extrude the material in the blank (11) into the mold (130), the molding component (13) is used to cool the high-temperature material, and the compression molding head (143) is used to extrude the material inside the mold (130). The material inside the mold (130) expands at a high temperature, pushing the compression molding head (143) to contract. The contraction force of the compression molding head (143) increases the cooling speed of the molding component (13); The molding assembly (13) further includes a circulation pump (132), and two hoses (131) are fixedly connected between the circulation pump (132) and the mold (130); The compression molding assembly (14) further includes a support plate (140), wherein a cylinder (141) is fixedly connected to the interior of the support plate (140); The end of the piston rod of the cylinder (141) is fixedly connected to a compression molding head (143); The compression molding head (143) comprises a fixed plate (1430), the fixed plate (1430) being fixedly connected to the end of the piston rod of the cylinder (141), a pressing plate (1431) being provided between the fixed plate (1430) and the interior of the mold (130), and an elastic member (1432) being fixedly connected between the pressing plate (1431) and the fixed plate (1430); When the material inside the mold (130) expands at a high temperature, the strong force generated by the expansion pushes the pressing plate (1431) toward the fixed plate (1430), causing the elastic member (1432) to contract; as the pressing plate (1431) moves outward from the inside of the mold (130), the distance between the pressing plate (1431) and the end of the mold (130) gradually increases; at this time, the hose (131) compressed between the pressing plate (1431) and the mold (130) expands due to the increase in the distance between the pressing plate (1431) and the mold (130), and its opening increases as it expands, causing the flow rate of the coolant inside the hose (131) to be greatly accelerated; this accelerated flow of coolant causes the circulation rate of the coolant inside the mold (130) to be correspondingly accelerated, thereby allowing the mold (130) to cool the plastic inside it faster.

2. The anti-overflow plastic injection molding device according to claim 1, characterized in that: The injection molding assembly (12) comprises an injection molding tube (120), wherein the injection molding tube (120) is fixedly connected to the interior of the blanking piece (11), and an injection molding machine (122) is fixedly connected to one end of the injection molding tube (120) away from the vertical plate (15), wherein a screw (121) is provided inside the injection molding machine (122), and the screw (121) is located inside the injection molding tube (120).

3. The anti-overflow plastic injection molding device according to claim 2, characterized in that: The circulation pump (132) is fixedly connected to the top of the base (1) and located at the bottom of the injection tube (120).

4. The overflow-proof plastic injection molding device according to claim 1, characterized in that: The support plate (140) is fixedly connected to an end of the top of the base (1) away from the blanking piece (11).

5. The overflow-proof plastic injection molding device according to claim 4, characterized in that: Guide pillars (142) are provided between the support plate (140) and the vertical plate (15) near the four corners, and the compression molding head (143) is movably connected between the outer walls of the four guide pillars (142).

6. A method for operating an anti-overflow plastic injection molding device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1. First, the injection molding component (12) is started to fully mix and stir the material inside the blank (11), and then heated at high temperature, and the material is punched into the mold (130) through the injection molding component (12); S2, the compression molding head (143) is pressed into the interior of the mold (130) by means of the expansion and contraction of the compression molding component (14), and when the material inside the mold (130) expands, the compression molding head (143) is driven to contract; S3. When the compression molding head (143) contracts, the cooling speed of the molding component (13) is accelerated, and the expanded material inside the mold (130) is cooled and contracted, thereby preventing the material inside the mold (130) from expanding too quickly and causing overflow; S4. When the material inside the mold (130) shrinks under the action of cooling and slowing down the injection molding flow rate, the compression molding head (143) will rebound and continue to press inside the mold (130), thereby increasing the cooling speed and accelerating the injection molding flow rate, making it convenient to continue to press the material into the mold (130), and this reciprocating process ensures the quality of plastic injection molding.

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