Injection molding device for plastic product production

Abstract

The invention relates to the technical field of injection molding devices, in particular to an injection molding device for plastic product production. The device comprises a machining table, the top of the machining table is fixedly connected with a first mold frame and a second mold frame, and a collecting groove is formed in the top of the machining table and located between the first mold frame and the second mold frame; according to the injection molding device for plastic product production, the arranged plasticizing injection mechanism is used for plasticizing plastic raw materials and injecting the plasticized molten plastic into each cavity internally provided with a mold core, and the demolding mechanism is used for reducing burrs generated on a plastic product; and the demolding mechanism can adapt to molten plastics with different temperatures injected into each mold cavity, after the plastics are cooled and solidified, the movable mold is separated from the fixed mold, and the demolding mechanism is used for separating plastic products adhered to the outer surface of each mold core. And the demolding mechanism automatically pops up the plastic products adhered to the inner wall of each cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding devices, in particular to an injection molding device for producing plastic products. Background Art

[0002] Plastic injection molding is a molding method widely used in modern manufacturing. In conventional operations, plastic raw materials are heated and melted, squeezed into molds, and cooled to form plastic products. However, this seemingly simple process has many challenges. First, slight fluctuations in the temperature of molten plastics can significantly affect the physical properties of plastic products. This is because the internal thermal stress of plastics is extremely sensitive to temperature changes, and different thermal stresses lead to differences in key physical properties of the final plastic products, such as mechanical strength, thermal insulation, sound insulation, and durability. To address this problem, the existing device sets a temperature adaptability adjustment mechanism inside the mold, so that the mold molding cavity specifications can dynamically adapt to molten plastics at different temperatures, which stabilizes the quality of plastic products to a certain extent. Secondly, the adhesion problem of plastic products to the inner wall of the mold has always been a difficult problem in the industry. During the injection molding process, due to the inherent characteristics of plastic materials, the cooled plastic products are easy to adhere to the inner wall of the mold, which is specifically divided into two situations: core adhesion and cavity adhesion. To solve the core adhesion problem, the method of setting ejector pins inside the core is currently widely used.

[0003] Ejectors play a dual role in the injection molding process of plastic products. During the mold closing stage, ejectors ensure that the core enters the mold cavity accurately, which is crucial to ensure the shape and dimensional accuracy of the plastic product. Once the core position is skewed, the resulting plastic product is likely to not meet quality standards, such as dimensional deviation, uneven wall thickness, etc.

[0004] However, the use of ejectors brings new complexities during the demolding stage. When considering the position of the ejector during injection, there are two situations: if the front end of the ejector is flush with the front end of the core, although it can effectively prevent the plastic product from adhering to the core during demolding, the ejector will prevent the plastic product from being smoothly removed from the cavity, causing the plastic product to be nailed into the cavity. This makes it extremely difficult to remove the plastic product later, and additional tools or complex operations may be required to remove the plastic product, which seriously affects production efficiency. On the contrary, if the ejector retracts into the core during injection, space is reserved for removing the plastic product during the demolding stage. However, during the injection process, the hot plastic will fill this reserved space and form larger burrs after cooling. These burrs not only affect the appearance quality of the plastic product, but also require additional removal processes, increasing production costs and production cycles.

[0005] In view of this, we propose an injection molding device for plastic product production to improve the deficiencies in the prior art. Summary of the invention

[0006] The object of the present invention is to provide an injection molding device for producing plastic products to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides an injection molding device for producing plastic products, comprising a processing table, a first mold frame and a second mold frame are fixedly connected to the top of the processing table, a collecting trough is opened between the first mold frame and the second mold frame at the top of the processing table, a molding mechanism is provided on the side of the first mold frame close to the second mold frame, a plurality of fixing rods are fixedly connected between the first mold frame and the molding mechanism, a plasticizing injection mechanism is provided on the side of the second mold frame close to the first mold frame, and the plasticizing injection mechanism is connected to the molding mechanism;

[0008] The molding mechanism at least comprises a fixed mold and a movable mold, the fixed mold is provided with a plurality of cavities on a side close to the movable mold, the movable mold is provided with a plurality of cores on a side close to the fixed mold, each cavity is provided corresponding to a core, and a mold ejection mechanism is provided between the fixed mold and the movable mold;

[0009] The plasticizing and injection mechanism is used to plasticize the plastic raw material and inject the plasticized molten plastic into each cavity containing a core. The demolding mechanism is used to reduce burrs on the plastic product, and the demolding mechanism can adapt to the molten plastic of different temperatures injected into each cavity. When the movable mold is separated from the fixed mold, the demolding mechanism is used to separate the plastic product adhered to the surface of each core. When the demolding mechanism reserves space for removing the plastic product, the demolding mechanism can pop out the plastic product adhered to the inner wall of each cavity.

[0010] As a further improvement of the present technical solution, the plasticizing injection mechanism includes a transfer chamber, the top of the transfer chamber is connected to a hopper, the transfer chamber is connected to a barrel on the side close to the first mold frame, the bottom of the hopper is connected to the top of the barrel, a screw is coaxially connected inside the barrel, the screw is driven by a motor, a nozzle is provided at one end of the barrel away from the hopper, and a plurality of heating rings are provided on the outer wall of the barrel.

[0011] As a further improvement of the present technical solution, the molding mechanism also includes a transfer cavity opened on the side of the fixed mold close to the core and a hydraulic rod arranged on the first mold frame, the transfer cavity is connected with the barrel through a nozzle, and a dispersion hole is connected between the transfer cavity and each cavity, the side of the movable mold away from the cavity is fixedly connected with a guide rod, a plurality of limiting holes are opened on the movable mold, the first mold frame is fixedly connected to the fixed part of the hydraulic rod, each of the limiting holes is arranged corresponding to each core, the guide rod is fixedly connected to the movable part of the hydraulic rod, and a plurality of cooling holes are opened on the side wall of the fixed mold.

[0012] As a further improvement of the present technical solution, the demolding mechanism comprises at least a demolding plate slidably connected to a plurality of fixed rods and a demolding hole opened inside each core, a plurality of ejector pins are fixedly connected to a side of the demolding plate close to the movable mold, each of the demolding holes is communicated with a corresponding limiting hole, and each of the ejector pins is slidably connected to the corresponding demolding hole.

[0013] As a further improvement of the technical solution, the demoulding mechanism further includes a plurality of blocks fixedly connected to each fixed rod, and when the movable mold is fitted with the fixed mold, each of the blocks is spaced apart from the demoulding mold plate.

[0014] As a further improvement of the technical solution, the friction coefficient of the movable mold is greater than the friction coefficient of the fixed rod.

[0015] As a further improvement of the present technical solution, the demolding mechanism also includes a plurality of pop-up adaptors arranged in each cavity, the pop-up adaptors include a pad slidably connected to the cavity, the outer wall of the pad is in contact with the inner wall of the cavity, a spring is provided on the side of the pad away from the cavity opening, and the two ends of the spring are respectively fixedly connected to the pad and the inner wall of the cavity away from the groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the injection molding device for producing plastic products, a plasticizing injection mechanism is provided to plasticize the plastic raw material and inject the plasticized molten plastic into each cavity containing a core inside. The demoulding mechanism is used to reduce burrs generated on the plastic products, and the demoulding mechanism can adapt to the molten plastics of different temperatures injected into each cavity. After the plastic is cooled and solidified, the movable mold is separated from the fixed mold. The demoulding mechanism is used to separate the plastic products adhered to the surface of each core. When the demoulding mechanism reserves space for removing the plastic products, the demoulding mechanism automatically ejects the plastic products adhered to the inner wall of each cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a partially cut-away front view of the present invention;

[0020] Figure 3 It is a cutaway view of the plasticizing injection mechanism of the present invention;

[0021] Figure 4 It is a cutaway front view of the molding mechanism of the present invention;

[0022] Figure 5 It is a cutaway view of the demoulding mechanism of the present invention;

[0023] Figure 6It is a position relationship diagram of the movable mold and the ejector pin of the present invention;

[0024] Figure 7 For the present invention Figure 5 Enlarged view of point A in the middle.

[0025] The meaning of each number in the figure is:

[0026] 100, processing table; 110, first mold frame; 120, second mold frame; 130, collecting tank; 140, fixing rod; 150, nozzle;

[0027] 200, plasticizing injection mechanism; 210, transfer chamber; 220, hopper; 230, barrel; 240, screw; 250, heating coil;

[0028] 300, molding mechanism; 310, fixed mold; 320, movable mold; 321, guide rod; 322, limit hole; 323, hydraulic rod; 330, cavity; 331, cooling hole; 340, core; 350, transfer cavity; 351, dispersion hole;

[0029] 400, demoulding mechanism; 410, demoulding plate; 411, ejector pin; 412, demoulding hole; 420, stopper; 430, ejection adaptor; 431, pad; 432, spring. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] 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 indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Example 1: Please refer to Figure 1 and Figure 2 As shown, the purpose of this embodiment is to provide an injection molding device for the production of plastic products, including a processing table 100, a first mold frame 110 and a second mold frame 120 are fixedly connected to the top of the processing table 100, a collecting tank 130 is opened between the first mold frame 110 and the second mold frame 120 at the top of the processing table 100, a molding mechanism 300 is provided on the side of the first mold frame 110 close to the second mold frame 120, a plurality of fixing rods 140 are fixedly connected between the first mold frame 110 and the molding mechanism 300, and a plasticizing injection mechanism 200 is provided on the side of the second mold frame 120 close to the first mold frame 110, and the plasticizing injection mechanism 200 is communicated with the molding mechanism 300;

[0034] The molding mechanism 300 at least includes a fixed mold 310 and a movable mold 320. The fixed mold 310 is provided with a plurality of cavities 330 on a side close to the movable mold 320. The movable mold 320 is provided with a plurality of cores 340 on a side close to the fixed mold 310. Each cavity 330 is provided corresponding to a core 340. A mold removal mechanism 400 is provided between the fixed mold 310 and the movable mold 320.

[0035] The plasticizing injection mechanism 200 is used to plasticize the plastic raw material and inject the plasticized molten plastic into each cavity 330 containing a core 340. The demolding mechanism 400 is used to reduce burrs on the plastic product, and the demolding mechanism 400 can adapt to the molten plastic of different temperatures injected into each cavity 330. When the movable mold 320 is separated from the fixed mold 310, the demolding mechanism 400 is used to separate the plastic product adhered to the surface of each core 340. When the demolding mechanism 400 reserves space for removing the plastic product, the demolding mechanism 400 can pop out the plastic product adhered to the inner wall of each cavity 330.

[0036] Working principle: First, add plastic raw materials (such as granular or powdered plastic raw materials) into the plasticizing injection mechanism 200, turn on its power, and the plasticizing injection mechanism 200 heats and melts the plastic raw materials into molten plastic, and pushes the movable mold 320 to move toward the fixed mold 310, so that each core 340 is completely located in the corresponding cavity 330; at this time, the plasticizing injection mechanism 200 injects the molten plastic into each cavity 330, and then injects cooling liquid (such as room temperature water) into the fixed mold 310. After the plastic between the core 340 and the cavity 330 is cooled and solidified, the movable mold 320 is driven away from the fixed mold 310 so that the core 340 is withdrawn from the cavity 330; the ejection mechanism 400 separates the plastic products adhered to the surface of each core 340 and the inner wall of each cavity 330, and pops out from each cavity 330 and falls into the collection tank 130.

[0037] In order to plasticize the granular or powdered plastic raw materials into a molten plastic with tight internal components and no bubbles. Figure 3 As shown, the plasticizing injection mechanism 200 includes a transfer chamber 210, the top of the transfer chamber 210 is connected to a hopper 220, the transfer chamber 210 is connected to a barrel 230 on the side close to the first mold frame 110, the bottom of the hopper 220 is connected to the top of the barrel 230, a screw 240 is coaxially connected inside the barrel 230, the screw 240 is driven by a motor, a nozzle 150 is provided at one end of the barrel 230 away from the hopper 220, and a plurality of heating rings 250 are provided on the outer wall of the barrel 230.

[0038] The improvement lies in that: granular or powdered plastic raw materials are put into the hopper 220, and the plastic raw materials slide downward under the action of their own gravity, and finally slide into the barrel 230 through the transfer chamber 210, and the spiral ridges of the screw 240 are close to the inner wall of the barrel 230, and the plastic raw materials that fall into the barrel 230 are heated and melted under the action of each heating ring 250, and the plastic raw materials are then stirred by the screw 240, and gradually become a molten plastic with a tight internal component and no bubbles. The molten plastic is then driven by the spiral ridges on the screw 240 and gradually passes through the nozzle 150 and is injected into the cavity 330.

[0039] The heating principle of the heating ring 250 is disclosed below:

[0040] Based on the Joule heating effect, when current passes through the heating element (such as a resistance wire) embedded in the heating coil 250, electrical energy is converted into thermal energy. The generated heat is transferred to the inside of the barrel 230 through the contact surface between the heating coil 250 and the barrel 230. In order to improve the heat transfer efficiency, the heating coil 250 and the barrel 230 are closely fitted. Generally, a material with good thermal conductivity (such as ceramic fiber) is arranged inside the heating coil 250 so that the heat can be quickly and evenly transferred to the barrel 230 to reduce heat loss.

[0041] In order to facilitate the injection of molten plastic and the demolding of the plastic product after solidification, the molding mechanism 300 of the present invention adopts a "fixed-one-movement" mold clamping system to improve the mold clamping and demolding efficiency of the molding mechanism 300.

[0042] exist Figure 4 In the figure, the molding mechanism 300 also includes a transfer cavity 350 opened on the side of the fixed mold 310 close to the core 340 and a hydraulic rod 323 arranged on the first mold frame 110, the transfer cavity 350 is connected with the barrel 230 through the nozzle 150, and a dispersion hole 351 is connected between the transfer cavity 350 and each cavity 330, a guide rod 321 is fixedly connected to the side of the movable mold 320 away from the cavity 330, a plurality of limiting holes 322 are opened on the movable mold 320, the first mold frame 110 is fixedly connected to the fixed part of the hydraulic rod 323, each limiting hole 322 is arranged corresponding to each core 340, the guide rod 321 is fixedly connected to the movable part of the hydraulic rod 323, and a plurality of cooling holes 331 are opened on the side wall of the fixed mold 310.

[0043] The improvement lies in that: when the plastic raw material falling into the barrel 230 is gradually plasticized into molten plastic, the hydraulic rod 323 is started to push the movable mold 320 to slide toward the fixed mold 310 through its movable part, and each core 340 slides into the inner wall of each cavity 330, and ensures that the movable mold 320 and the fixed mold 310 are tightly fitted. After the coolant is injected into each cooling hole 331 to cool the plastic products in the cavity 330 and form, the hydraulic rod 323 is started to drive the movable mold 320 away from the fixed mold 310 through its movable part, so that the core 340 slides out of the cavity 330.

[0044] Due to the material properties of the plastic product itself, the molten plastic injected into the cavity 330 may adhere to the core 340 after cooling and solidification. In order to solve the above problem, an ejector pin 411 is introduced into each core 340.

[0045] like Figure 5 and Figure 6 As shown, the specific structure of the mold ejection mechanism 400 is disclosed below. The mold ejection mechanism 400 at least includes a mold ejection plate 410 slidably connected to a plurality of fixed rods 140 and a mold ejection hole 412 opened inside each core 340. A plurality of ejector pins 411 are fixedly connected to one side of the mold ejection plate 410 close to the movable mold 320. Each mold ejection hole 412 is communicated with a corresponding limit hole 322, and each ejector pin 411 is slidably connected to the corresponding mold ejection hole 412.

[0046] After the molten plastic injected into the cavity 330 is cooled and formed, the core 340 slides out of the cavity 330 . When the core 340 and the ejector pin 411 slide relative to each other, the ejector pin 411 will eject the plastic adhered to the surface of the core 340 .

[0047] The introduction of ejector pin 411 can ensure that core 340 accurately enters cavity 330, ensure the shape and dimensional accuracy of the final plastic product, and prevent the dimensional deviation and uneven wall thickness of the plastic product caused by the skewed position of core 340. However, it also brings new challenges: when considering the position of ejector pin 411 during the injection process, two contradictions will arise: if the front end of ejector pin 411 is flush with the front end of core 340, although it can effectively prevent the plastic product from adhering to core 340 during demolding, ejector pin 411 will prevent the plastic product from being smoothly removed from cavity 330, causing the plastic product to be nailed in cavity 330. This makes it extremely difficult to remove the plastic product later, seriously affecting production efficiency. On the contrary, if ejector pin 411 retracts into core 340 during injection, space is reserved for removing the plastic product during demolding. Then during the injection process, hot plastic will fill this reserved space and form larger burrs after cooling. These burrs not only affect the appearance quality of plastic products, but also require additional removal processes, increasing production costs and production cycles.

[0048] Therefore, the mold ejection mechanism 400 further includes a plurality of stoppers 420 fixedly connected to each fixed rod 140. When the movable mold 320 is in contact with the fixed mold 310, each stopper 420 is spaced apart from the mold ejection plate 410. The friction coefficient of the movable mold 320 is greater than the friction coefficient of the fixed rod 140, and the sum of the maximum static friction forces between the movable mold 320 and each ejector pin 411 is greater than the sum of the sliding friction forces between the mold ejection plate 410 and each fixed rod 140.

[0049] That is to say, during the mold closing and injection stage, the front end of the ejector pin 411 is kept flush with the front end of the core 340, reducing the unnecessary space between the core 340 and the cavity 330 except for the formation of the plastic product, thereby reducing the burrs on the finished plastic product. After the plastic product is cooled, when the core 340 slides out of the cavity 330, the maximum static friction between the movable mold 320 and each ejector pin 411 is greater than the maximum sliding friction between the ejector plate 410 and each fixing rod 140. Therefore, the movable mold 320 will pass through the space between the ejector pins 411 to form a plastic product. The static friction force generated by the ejector plate 410 drives the ejector plate 410 to slide along the fixed rod 140. After the ejector pin 411 slides out of the cavity 330 for a certain distance and reserves a space for removing the plastic product, the ejector pin 411 stops sliding because the ejector plate 410 is blocked by the stopper 420, and the movable mold 320 continues to slide along the fixed rod 140 under the drive of the recovery movable part of the hydraulic rod 323. Therefore, the core 340 and the ejector pin 411 slide relative to each other, thereby ejecting the plastic product adhering to the surface of the core 340 and dropping it into the collection tank 130 below.

[0050] Example 2: Please refer to Figure 7As shown, in the present application, after the core 340 is pushed into the cavity 330, if the temperature of the molten plastic injected into the cavity 330 is different, the physical properties of the final plastic product will change significantly. Therefore, a pop-up adapter 430 is introduced into the cavity 330 to adapt to different problematic molten plastics.

[0051] Next, the specific structure of the mold ejection mechanism 400 is further disclosed. The mold ejection mechanism 400 also includes a plurality of pop-up adaptors 430 disposed in each cavity 330. The pop-up adaptors 430 include a pad 431 slidably connected to the cavity 330. The outer wall of the pad 431 fits the inner wall of the cavity 330. A spring 432 is disposed on the side of the pad 431 away from the opening of the cavity 330. The two ends of the spring 432 are respectively fixedly connected to the pad 431 and the inner wall of the cavity 330 away from the notch.

[0052] In the above situation, when the temperature of the molten plastic injected into the cavity 330 changes, the spring 432 connected to the pad 431 will absorb the additional thermal stress generated: when the temperature becomes higher, the thermal stress inside the molten plastic increases, and the pad 431 slides in the cavity 330 toward the side away from the opening; when the temperature becomes lower, the thermal stress inside the molten plastic decreases, and the pad 431 slides in the cavity 330 toward the side close to the opening, and ensures that the thickness change of the plastic product is always within the precision error range of the plastic product;

[0053] As the ejector pin 411 leaves the cavity 330 , the spring 432 , which was originally in a compressed state, loses its squeezing force due to the pressing of the pad 431 by the core 340 . Under the action of the restoring force of the spring 432 , the pad 431 slides along the inner wall of the cavity 330 toward the side close to the opening of the cavity 330 , thereby pushing the plastic product in the cavity 330 into the collecting tank 130 .

[0054] In summary, the working principle of the present invention is as follows:

[0055] First, a plastic raw material (such as a granular or powdered plastic raw material) is added into the hopper 220, and the power is turned on. The heating coil 250 heats and melts the plastic raw material into molten plastic, and then the hydraulic rod 323 is started to push the movable mold 320 to move toward the fixed mold 310, so that each core 340 is completely located in the corresponding cavity 330; at this time, the screw 240 rotates to inject the molten plastic into the transfer cavity 350 through the nozzle 150, and the molten plastic entering the transfer cavity 350 then enters each cavity 330 through each dispersion hole 351, and the front end of the ejector pin 411 is kept flush with the front end of the core 340, reducing the unnecessary space between the core 340 and the cavity 330 except for forming the plastic product, thereby reducing the burrs generated on the obtained plastic product;

[0056] Then, coolant is injected into each cooling hole 331. After the molten plastic injected into the cavity 330 is cooled and formed, the core 340 is driven to slide out of the cavity 330 by the hydraulic rod 323. At this time, since the sum of the maximum static friction between the movable mold 320 and each ejector pin 411 is greater than the sum of the sliding friction between the ejector plate 410 and each fixed rod 140, the movable mold 320 will drive the ejector plate 410 along the fixed rod 140 through the sum of the static friction between the ejector pin 411 and the movable mold 320. 40 slides, and after the ejector pin 411 slides out of the mold cavity 330 for a certain distance and a space is reserved for removing the plastic product, the ejector pin 411 stops sliding because the ejector plate 410 is blocked by the stopper 420, and the movable mold 320 continues to slide along the fixed rod 140 under the driving of the hydraulic rod 323 to recover the movable part. Therefore, the core 340 and the ejector pin 411 slide relative to each other, thereby ejecting the plastic product adhering to the outer surface of the core 340 and dropping it into the collecting tank 130 below;

[0057] As the ejector pin 411 leaves the cavity 330 , the spring 432 , which was originally in a compressed state, loses its squeezing force due to the pressing of the pad 431 by the core 340 . Under the action of the restoring force of the spring 432 , the pad 431 slides along the inner wall of the cavity 330 toward the side close to the opening of the cavity 330 , thereby pushing the plastic product in the cavity 330 into the collecting tank 130 .

[0058] 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 by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An injection molding device for producing plastic products, comprising a processing table (100), a first mold frame (110) and a second mold frame (120) being fixedly connected to the top of the processing table (100), a collecting tank (130) being provided between the first mold frame (110) and the second mold frame (120) at the top of the processing table (100), characterized in that: The first mold frame (110) is provided with a molding mechanism (300) on a side close to the second mold frame (120), a plurality of fixing rods (140) are fixedly connected between the first mold frame (110) and the molding mechanism (300), and the second mold frame (120) is provided with a plasticizing injection mechanism (200) on a side close to the first mold frame (110), and the plasticizing injection mechanism (200) is connected to the molding mechanism (300); The molding mechanism (300) at least comprises a fixed mold (310) and a movable mold (320); the fixed mold (310) is provided with a plurality of cavities (330) on a side close to the movable mold (320); the movable mold (320) is provided with a plurality of cores (340) on a side close to the fixed mold (310); each cavity (330) is arranged corresponding to a core (340); and a mold ejection mechanism (400) is provided between the fixed mold (310) and the movable mold (320); The plasticizing injection mechanism (200) is used to plasticize the plastic raw material and inject the plasticized molten plastic into each cavity (330) containing a core (340) therein; the demolding mechanism (400) is used to reduce burrs generated on the plastic product, and the demolding mechanism (400) can adapt to the molten plastic of different temperatures injected into each cavity (330); when the movable mold (320) is separated from the fixed mold (310), the demolding mechanism (400) is used to separate the plastic product adhered to the surface of each core (340); when the demolding mechanism (400) reserves a space for removing the plastic product, the demolding mechanism (400) can eject the plastic product adhered to the inner wall of each cavity (330).

2. The injection molding device for plastic product production according to claim 1, characterized in that: The plasticizing injection mechanism (200) comprises a transfer chamber (210), the top of the transfer chamber (210) is connected to a hopper (220), the transfer chamber (210) is connected to a barrel (230) on a side close to the first mold frame (110), the bottom of the hopper (220) is connected to the top of the barrel (230), a screw (240) is coaxially connected inside the barrel (230), the screw (240) is driven by a motor, a nozzle (150) is provided at one end of the barrel (230) away from the hopper (220), and a plurality of heating rings (250) are provided on the outer wall of the barrel (230).

3. The injection molding device for plastic product production according to claim 2, characterized in that: The molding mechanism (300) further comprises a transfer cavity (350) provided on a side of the fixed mold (310) close to the mold core (340) and a hydraulic rod (323) provided on the first mold frame (110); the transfer cavity (350) is connected to the barrel (230) via a nozzle (150); a dispersion hole (351) is provided between the transfer cavity (350) and each mold cavity (330); and the movable mold (320) is away from the mold cavity (330). A guide rod (321) is fixedly connected to one side, a plurality of limiting holes (322) are opened on the movable mold (320), the first mold frame (110) is fixedly connected to the fixed part of the hydraulic rod (323), each of the limiting holes (322) is arranged corresponding to each core (340), the guide rod (321) is fixedly connected to the movable part of the hydraulic rod (323), and a plurality of cooling holes (331) are opened on the side wall of the fixed mold (310).

4. The injection molding device for plastic product production according to claim 3, characterized in that: The mold ejection mechanism (400) comprises at least a mold ejection plate (410) slidably connected to a plurality of fixed rods (140) and a mold ejection hole (412) provided inside each core (340); a plurality of ejector pins (411) are fixedly connected to a side of the mold ejection plate (410) close to the movable mold (320); each of the mold ejection holes (412) is communicated with a corresponding limiting hole (322); and each of the ejector pins (411) is slidably connected to a corresponding mold ejection hole (412).

5. The injection molding device for plastic product production according to claim 4, characterized in that: The demoulding mechanism (400) further comprises a plurality of stoppers (420) fixedly connected to each fixed rod (140); when the movable mold (320) is fitted with the fixed mold (310), each of the stoppers (420) is spaced apart from the demoulding mold (410).

6. The injection molding device for plastic product production according to claim 1, characterized in that: The friction coefficient of the movable mold (320) is greater than the friction coefficient of the fixed rod (140).

7. The injection molding device for plastic product production according to claim 1, characterized in that: The demoulding mechanism (400) further comprises a plurality of pop-up adaptors (430) arranged in each cavity (330), wherein the pop-up adaptors (430) comprise a pad (431) slidably connected to the cavity (330), wherein the outer wall of the pad (431) fits the inner wall of the cavity (330), and a spring (432) is provided on the side of the pad (431) away from the opening of the cavity (330), and the two ends of the spring (432) are respectively fixedly connected to the pad (431) and the inner wall of the cavity (330) away from the notch.

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