Plastic injection molding device and method thereof

Abstract

The invention relates to the technical field of injection molding equipment, in particular to a plastic injection molding device and method. Comprising a workbench, an injection mold is arranged at the top of the workbench, a gun barrel is arranged on one side of the injection mold, a stock bin is arranged above the gun barrel, an electromagnetic valve is arranged between the stock bin and a heating ring, a stirring assembly is arranged in the stock bin, a material injection assembly is arranged in a supporting pipe, and a defoaming assembly is arranged at the end of the material injection assembly. The pressing block extrudes the melt, so that the melt enters the melt hole, pressure is applied to the sealing plate when the melt enters the melt hole, the connecting rod arranged at the end of the sealing plate pulls the sliding rod to slide on the inner wall of the column casing, at the moment, the sealing plate is far away from the end of the extending nozzle, and the melt flows into the side, close to the injection mold, of the injection end through the defoaming ring; and in the moving process of the melt, a filter screen is arranged in the defoaming ring, bubbles in the melt are eliminated through the filter screen, and therefore defoaming operation on the melt is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, in particular to a plastic injection molding device and a method thereof. Background Art

[0002] Plastic products are widely used in various fields. Injection molding is a very common processing method for plastic products. Existing injection molding devices generally include molds, heating and plasticizing mechanisms, and injection mechanisms. The plastic raw materials are heated and plasticized by the heating and plasticizing mechanism and then transported to the injection mechanism. The injection mechanism then injects the molten plastic into the mold through an injection tube.

[0003] There are many existing technologies for injection molding devices, such as:

[0004] Chinese patent publication number CN117621355A discloses a plastic injection molding device, including a heating and plasticizing mechanism, an injection mechanism and a mold arranged on a frame, the injection mechanism including a barrel, an injection tube is arranged at one end of the barrel facing the mold, the heating and plasticizing mechanism is connected to the barrel, a piston is arranged inside the barrel, and the piston is connected to a piston driving mechanism; a sealing baffle is arranged at one end of the barrel facing the mold, the injection tube passes through the sealing baffle, the injection tube slides and seals with the sealing baffle; a solid driving rod is connected to the feed end of the injection tube, a feed port is arranged on the side wall of the feed end of the injection tube, the driving rod passes through the piston, the driving rod slides and seals with the piston; the driving rod is connected to an injection tube driving mechanism for driving the injection tube to move axially. After the injection is completed, the invention can collect the injection tube into the barrel for heat preservation to prevent the residual plastic in the injection tube from cooling and solidifying and causing the injection tube to be blocked.

[0005] However, there are still some problems in actual use:

[0006] 1. In the use of traditional plastic injection molding devices, the molten material is mainly injected through the feeding screw. The feeding screw transmits the molten material while rotating. However, this transmission method has certain limitations. Since the rotation speed of the screw is relatively slow, the advancement speed of the molten material during the injection molding process is also limited. This not only prolongs the injection molding cycle, but also directly affects the injection molding efficiency;

[0007] 2. Plastic particles may absorb moisture in the air during storage and transportation. When these particles containing moisture are heated and melted in the injection molding device, the moisture will quickly vaporize to form bubbles. If the bubbles are not defoamed, the presence of bubbles will make the structure of the plastic product uneven, reduce the strength and stability of the product, and affect the product quality when the injection molding is completed.

[0008] Therefore, a plastic injection molding device and a method thereof are proposed. Summary of the invention

[0009] The object of the present invention is to provide a plastic injection molding device and method thereof to solve the problems raised in the above background technology.

[0010] In order to solve the above technical problems, one of the objects of the present invention is to provide a plastic injection molding device, including a workbench, an injection mold is provided on the top of the workbench, a barrel is provided on one side of the injection mold, a silo is provided above the barrel, an electromagnetic valve is provided between the silo and the heating ring, a stirring component is provided inside the silo, the stirring component is used to stir the plastic raw material particles so that the clustered particles are separated from each other, a heating ring is provided on the surface of the barrel, the heating ring is used to heat the inside of the barrel, an output motor is provided at the end of the barrel, the output end of the output motor passes through the barrel and a feeding screw is provided at the end, a support tube is provided below the feeding screw, a partition is provided inside the support tube, the partition divides the support tube into an injection end and an extrusion end, a positioning block is provided at the end of the partition, a connecting pipe is provided between the barrel and the support tube, a one-way valve is provided on the surface of the connecting pipe, an injection assembly is provided inside the support tube, the injection assembly is used to pressurize the injection mold, and a defoaming assembly is provided at the end of the injection assembly, and the defoaming assembly is used to defoam the molten material.

[0011] As a further improvement of the present technical solution, the stirring assembly includes a servo motor arranged on the top of the silo, the output end of the servo motor passes through the silo and a base plate is provided at the end, a stirring rod is provided at the bottom of the base plate, and the output end of the servo motor drives the stirring rod to rotate to stir the raw material particles, so that the clumped particles collide with the inside of the barrel to separate, and a heating wire is provided inside the silo, and the heating wire is used to heat and soften the inside of the raw material particles when the heating of the raw material particles is completed.

[0012] As a further improvement of the technical solution, scrapers are rotatably provided on both sides of the base plate, a torsion spring is provided between the base plate and the scraper, the scraper is subjected to the force of the torsion spring and forms an angle of 15° with the base plate, and the scraper is in contact with the inner wall of the silo when rotating.

[0013] As a further improvement of the present technical solution, the injection assembly includes a push rod arranged at the extrusion end, an adapter block is provided on one side of the push rod, the adapter block passes through the partition and a pressure block is provided at the end. The push rod is rotated to push the adapter block to move in the injection end to extrude the molten material, so that the molten material is injected into the injection mold through the injection nozzle at the injection end for injection molding.

[0014] As a further improvement of the present technical solution, a return spring is provided between the adapter block and the partition. When the push rod rotates, the end of the adapter block is squeezed. The pressure block provided at the end of the adapter block moves back and forth inside the injection end under the action of the return spring, and the molten material is repeatedly injected into the injection mold. The pressure block is adapted to the positioning block close to the partition side.

[0015] As a further improvement of the present technical solution, an extended nozzle is provided at the end of the pressing block, and a melt hole is opened on the inner wall of the pressing block. When the melt hole stops extruding the melt inside the injection end and injecting it into the injection mold, the melt hole moves horizontally in the opposite direction under the action of a return spring, so that the molten material inside the silo passes through the melt hole into the injection end close to the injection mold side, and an injection groove is provided on the side of the pressing block close to the partition.

[0016] As a further improvement of the technical solution, the end of the feeding screw and the end of the push rod are both provided with pulleys, the pulleys are in the same vertical plane and a transmission belt is provided between the pulleys.

[0017] As a further improvement of the present technical solution, a slide groove is provided on the inner wall of the extended nozzle, and a defoaming component is slidably provided in the slide groove. When the defoaming component squeezes the molten material in the injection end of the pressure block to inject the injection mold, the defoaming component and the extended nozzle are in a closed state. When the injection molding is completed, the defoaming component slides on the inner wall of the slide groove and is in an open state with the extended nozzle, and defoams the molten material.

[0018] As a further improvement of the present technical solution, the defoaming component includes a column barrel arranged on the inner wall of the slide groove, a sliding rod is slidably provided on the inner wall of the column barrel, a compression spring is provided between the sliding rods, a connecting rod is provided at the end of the sliding rod, a sealing plate is provided at the end of the connecting rod, the sealing plate is used to seal the end of the extended nozzle, a through hole is opened on the surface of the sealing plate, the through holes are arranged in a circular array, a defoaming ring is provided at the through hole, and when the molten material passes through the molten material hole to squeeze the sealing plate, the molten material flows out through the defoaming ring.

[0019] A second object of the present invention is to provide a plastic injection molding method, comprising any one of the above-mentioned plastic injection molding devices, comprising the following steps:

[0020] S1. Pour the raw material particles into the silo and stir the raw material particles through a stirring component to disperse the agglomerated particles;

[0021] S2. The feeding screw is driven to rotate by the output motor, and the molten material heated inside the barrel is injected into the support tube through the connecting pipe. The molten material is extruded by the injection assembly, so that the molten material is injected into the injection mold through the injection nozzle provided at the end of the support tube, and the bubbles are eliminated by the injection assembly provided at the end of the injection assembly.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the plastic injection molding device, the raw material particles are poured into the silo, and the output end of the servo motor drives the base plate to rotate. The stirring rod provided at the bottom of the base plate stirs the raw material particles inside the servo motor. The raw material particles collide with the inside of the servo motor during the stirring process, so that the clumped particles can be dispersed. During the heating and melting process, they can be completely dissolved, avoiding the injection port from being blocked, and improving the processing efficiency.

[0024] 2. In the plastic injection molding device, the adapter block is driven to move on the inner wall of the support tube by rotating the ejector rod. When the adapter block moves, it drives the pressure block to extrude the molten material inside the injection end, so that the molten material is injected into the injection mold through the injection nozzle at the end of the injection end. Since the pressure block is subjected to thrust during the molten material extrusion process, the molten material has a certain acceleration, thereby increasing the pressure of the molten material injected into the injection mold, squeezing and discharging the air inside the injection mold, and improving the product quality of the injection molded parts.

[0025] 3. In the plastic injection molding device, the rotation of the push rod drives the adapter block to move horizontally on the inner wall of the support tube. The pressure block provided at the end of the adapter block squeezes the molten material in the injection end, so that the molten material in the injection end is injected into the injection mold through the injection port at the end of the injection end. During the injection process, the molten material inside the barrel flows into the injection end from the connecting pipe. When the injection is completed, the pressure block is reset by the force of the reset spring. The pressure block squeezes the molten material to make the molten material enter the molten material hole. When the molten material enters the molten material hole, pressure is applied to the sealing plate. The connecting rod provided at the end of the sealing plate pulls the sliding rod to slide on the inner wall of the column. At this time, the sealing plate is away from the end of the extended nozzle. The molten material flows into the injection end close to the injection mold through the defoaming ring. During the movement of the molten material, a filter screen is provided inside the defoaming ring. The bubbles in the molten material are eliminated by the filter screen, thereby realizing the defoaming operation of the molten material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the barrel structure of the present invention;

[0028] Figure 3 It is a cross-sectional view of the barrel of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the stirring assembly of the present invention;

[0030] Figure 5 For the present invention Figure 4 Schematic diagram of point A;

[0031] Figure 6 It is a schematic diagram of the structure of the injection assembly of the present invention;

[0032] Figure 7 It is a cross-sectional view of the injection assembly of the present invention;

[0033] Figure 8 For the present invention Figure 7 Schematic diagram of point B;

[0034] Fig. 9 It is a schematic diagram of the structure of the defoaming component of the present invention.

[0035] The meaning of each number in the figure is:

[0036] 100. workbench; 101. injection mold;

[0037] 200, barrel; 201, silo; 202, electromagnetic valve; 203, heating coil; 204, output motor; 205, feeding screw; 206, connecting pipe; 207, one-way valve; 208, support pipe; 209, partition; 210, positioning block; 211, heating wire; 212, transmission belt;

[0038] 300, stirring assembly; 301, servo motor; 302, substrate; 303, stirring rod; 304, scraper; 305, torsion spring;

[0039] 400, injection assembly; 401, ejector pin; 402, adapter block; 403, pressing block; 404, melt hole; 405, injection slot; 406, extension nozzle; 407, return spring;

[0040] 500, defoaming assembly; 501, column; 502, slide rod; 503, compression spring; 504, connecting rod; 505, sealing plate; 506, defoaming ring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of 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.

[0042] Example 1

[0043] like Figure 1As shown, one of the purposes of the present invention is to provide a plastic injection molding device, referring to Figures 1-9, comprising a workbench 100, an injection mold 101 is arranged on the top of the workbench 100, a barrel 200 is arranged on one side of the injection mold 101, a silo 201 is arranged above the barrel 200, an electromagnetic valve 202 is arranged between the silo 201 and the heating ring 203, a stirring assembly 300 is arranged inside the silo 201, the stirring assembly 300 is used to stir the plastic raw material particles to separate the agglomerated particles from each other, a heating ring 203 is arranged on the surface of the barrel 200, the heating ring 203 is used to heat the inside of the barrel 200, and an output motor 204 is arranged at the end of the barrel 200 The output end of the output motor 204 passes through the barrel 200 and is provided with a feeding screw 205 at the end. A support tube 208 is provided below the feeding screw 205. A partition 209 is provided inside the support tube 208. The partition 209 divides the support tube 208 into an injection end and an extrusion end. A positioning block 210 is provided at the end of the partition 209. A connecting tube 206 is provided between the barrel 200 and the support tube 208. A one-way valve 207 is provided on the surface of the connecting tube 206. An injection assembly 400 is provided inside the support tube 208. The injection assembly 400 is used to pressurize the injection into the injection mold 101. A defoaming assembly 500 is provided at the end of the injection assembly 400. The defoaming assembly 500 is used to defoam the molten material.

[0044] The improvement of this embodiment is that the adapter block 402 is driven to move horizontally on the inner wall of the support tube 208 by the rotation of the ejector rod 401, and the pressing block 403 provided at the end of the adapter block 402 squeezes the molten material in the injection end, so that the molten material in the injection end is injected into the injection mold 101 through the injection port at the end of the injection end. During the injection process, the molten material in the barrel 200 flows into the injection end from the connecting tube 206. When the injection is completed, the pressing block 403 is reset by the force of the reset spring 407, and the pressing block 403 squeezes the molten material. , allowing the molten material to enter the molten material hole 404. When the molten material enters the molten material hole 404, pressure is applied to the sealing plate 505. The connecting rod 504 provided at the end of the sealing plate 505 pulls the sliding rod 502 to slide on the inner wall of the column 501. At this time, the sealing plate 505 is away from the end of the extension nozzle 406, and the molten material flows into the injection end close to the injection mold 101 through the defoaming ring 506. During the movement of the molten material, a filter screen is provided inside the defoaming ring 506, and bubbles in the molten material are eliminated through the filter screen, thereby realizing the defoaming operation of the molten material.

[0045] During the injection molding process, the raw material particles are easily agglomerated due to the long-term accumulation. During the heating and melting process, the inside of the agglomerated particles cannot be completely melted, resulting in the blockage of the injection port, which affects the processing efficiency. Therefore, the stirring component 300 includes a servo motor 301 arranged on the top of the silo 201. The output end of the servo motor 301 passes through the silo 201 and is provided with a base plate 302 at the end. A stirring rod 303 is provided at the bottom of the base plate 302. The output end of the servo motor 301 drives the stirring rod 303 to rotate to stir the raw material particles, so that the agglomerated particles collide with each other. The interior of the silo 201 is separated, and a heating wire 211 is provided inside the silo 201. The heating wire 211 is used to heat and soften the interior of the raw material particles after the heating is completed. The output end of the servo motor 301 drives the base plate 302 to rotate, and a stirring rod 303 provided at the bottom of the base plate 302 stirs the raw material particles inside the servo motor 301. The raw material particles collide with the inside of the servo motor 301 during the stirring process, so that the clumped particles can be dispersed. During the heating and melting process, they can be completely melted to avoid the injection port from being blocked, thereby improving the processing efficiency.

[0046] Considering that when the raw material particles are stirred, they are injected into the barrel 200 for heating, and the melting speed is slow, therefore, scrapers 304 are rotatably provided on both sides of the substrate 302, and a torsion spring 305 is provided between the substrate 302 and the scraper 304. The scraper 304 is subjected to the force of the torsion spring 305 and forms an angle of 15° with the substrate 302. When the scraper 304 rotates, it fits with the inner wall of the silo 201, and the raw material particles are stirred when the stirring rod 303 rotates. When the raw material particles are stirred, they hit the inner wall of the silo 201 to disperse. When the stirring of the raw material particles is completed, the interior of the silo 201 is heated by the heating wire 211 to soften the raw material particles, and the electromagnetic valve 202 is controlled to input the raw material particles inside the silo 201 into the barrel 200, and the raw material particles are heated by the heating ring 203 to melt the raw material particles quickly, thereby improving the injection molding efficiency.

[0047] When the mold is being injected, in order to reduce the residual gas inside the mold and improve the quality of the injection molded parts, the injection assembly 400 includes a push rod 401 arranged at the extrusion end, an adapter block 402 is arranged on one side of the push rod 401, the adapter block 402 penetrates the partition 209 and a pressure block 403 is arranged at the end, the push rod 401 is rotated to push the adapter block 402 to move in the injection end to extrude the molten material, so that the molten material is injected into the injection mold 101 through the injection nozzle at the injection end for injection molding, a return spring 407 is arranged between the adapter block 402 and the partition 209, when the push rod 401 rotates, the end of the adapter block 402 is squeezed, and the pressure block 403 at the end of the adapter block 402 is reciprocated inside the injection end by the force of the return spring 407, and the molten material is repeatedly injected into the injection mold 101, and the pressure block 403 is close to the partition 209. The side is adapted to the positioning block 210. When the injection molding operation is performed, the adapter block 402 is driven to move on the inner wall of the support tube 208 by rotating the ejector pin 401. When the adapter block 402 moves, it drives the pressure block 403 to extrude the molten material inside the injection end, so that the molten material is injected into the injection mold 101 through the injection nozzle at the end of the injection end. Since the pressure block 403 is subjected to thrust in the process of extruding the molten material, the molten material has a certain acceleration, thereby increasing the pressure of the molten material injected into the injection mold 101, squeezing and discharging the air inside the injection mold 101, and improving the product quality of the injection molded part. When the ejector pin 401 is in the process of continuous rotation, the adapter block 402 is subjected to the restoring force of the return spring 407, so that the adapter block 402 drives the pressure block 403 to reciprocate in the injection end, continuously extrude and inject the molten material, and improve the injection molding efficiency.

[0048] In order to speed up the injection pressure of the pressing block 403 on the molten material, an extension nozzle 406 is provided at the end of the pressing block 403, and a molten material hole 404 is opened on the inner wall of the pressing block 403. When the molten material hole 404 stops extruding and injecting the molten material inside the injection end into the injection mold 101, the molten material hole 404 is moved horizontally in the opposite direction by the force of the return spring 407, so that the molten material inside the silo 201 enters the injection end close to the injection mold 101 through the molten material hole 404. The pressing block 403 is provided with an injection groove 405 on the side close to the partition 209. When the molten material is injected into the ejector rod 401 through the connecting pipe 206, the molten material enters the injection end. When the pressing block 403 moves away from the injection mold 101, the molten material in the injection end is squeezed by the pressing block 403 and flows from the molten material hole 404 to the side close to the injection mold 101, so as to facilitate the extrusion and injection of the molten material when the pressing block 403 reciprocates.

[0049] Taking into account the need to keep the feeding screw 205 and the push rod 401 rotating during the melting, feeding and injection molding of the raw material particles, in order to save electricity resources, pulleys are provided at the ends of the feeding screw 205 and the push rod 401. The pulleys are in the same vertical plane and a transmission belt 212 is provided between the pulleys. The feeding screw 205 is driven to rotate by the output motor 204, and the feeding screw 205 and the push rod 401 pulleys are driven by the transmission belt 212 to ensure that the feeding screw 205 feeds the molten material and the push rod 401 performs injection molding operations on the injection mold 101, thereby saving electricity resources.

[0050] Considering that during the injection molding operation, there is gas inside the molten material during the melting process, resulting in many small bubbles inside the plastic during the injection molding operation, which affects the production quality of the product. Therefore, a slide groove is provided on the inner wall of the extension nozzle 406, and a defoaming component 500 is slidably provided in the slide groove. When the defoaming component 500 squeezes the molten material in the injection end of the pressure block 403 to perform injection molding on the injection mold 101, the defoaming component 500 and the extension nozzle 406 are in a closed state. When the injection molding is completed, the defoaming component 500 slides between the inner wall of the slide groove and the extension nozzle 406. In the open state, the molten material is defoamed. The defoaming component 500 includes a column 501 arranged on the inner wall of the slide groove. A slide rod 502 is slidably arranged on the inner wall of the column 501. A compression spring 503 is arranged between the slide rods 502. A connecting rod 504 is arranged at the end of the slide rod 502. A sealing plate 505 is arranged at the end of the connecting rod 504. The sealing plate 505 is used to seal the end of the extension nozzle 406. A through hole is opened on the surface of the sealing plate 505. The through holes are arranged in a circular array. A defoaming ring 506 is arranged at the through hole. When the molten material passes through the molten material hole 404 and squeezes the sealing plate 505, the molten material The material flows out through the defoaming ring 506. During the injection molding operation, the push rod 401 rotates to drive the adapter block 402 to move horizontally on the inner wall of the support tube 208. The pressure block 403 provided at the end of the adapter block 402 squeezes the molten material in the injection end, so that the molten material in the injection end is injected into the injection mold 101 through the injection port at the end of the injection end. During the injection process, the molten material inside the barrel 200 flows into the injection end from the connecting pipe 206. When the injection is completed, the pressure block 403 is reset by the force of the reset spring 407. During the reset process, the pressure block 403 squeezes the molten material. The molten material is extruded to allow the molten material to enter the molten material hole 404. When the molten material enters the molten material hole 404, pressure is applied to the sealing plate 505. The connecting rod 504 provided at the end of the sealing plate 505 pulls the sliding rod 502 to slide on the inner wall of the column 501. At this time, the sealing plate 505 is away from the end of the extension nozzle 406. The molten material flows into the injection end close to the injection mold 101 through the defoaming ring 506. During the movement of the molten material, a filter screen is provided inside the defoaming ring 506. The bubbles in the molten material are eliminated through the filter screen, thereby ensuring the injection quality of the product during the injection molding operation.

[0051] When used specifically, the raw material particles are poured into the silo 201, and the output end of the servo motor 301 drives the base plate 302 to rotate. The stirring rod 303 provided at the bottom of the base plate 302 stirs the raw material particles inside the servo motor 301. During the stirring process, the raw material particles collide with the inside of the servo motor 301, so that the clumped particles can be dispersed. During the heating and melting process, they can be completely melted to avoid the injection port from being blocked, thereby improving the processing efficiency. The adapter block 402 is driven to move on the inner wall of the support tube 208 by rotating the top rod 401. When the adapter block 402 moves, it drives the pressing block 403 to the inside of the injection end. The molten material is extruded, and the molten material is injected into the injection mold 101 through the injection nozzle at the end of the injection end. Since the pressing block 403 is subjected to thrust during the process of extruding the molten material, the molten material has a certain acceleration, thereby increasing the pressure of the molten material injected into the injection mold 101, and the air inside the injection mold 101 is extruded and discharged, thereby improving the product quality of the injection molded part. When the ejector 401 is in the process of continuous rotation, the adapter block 402 is subjected to the restoring force of the return spring 407, so that the adapter block 402 drives the pressing block 403 to reciprocate in the injection end, and the molten material is continuously extruded and injected, thereby improving the injection molding efficiency.

[0052] When the molten material is squeezed against the sealing plate 505 through the molten material hole 404, the molten material flows out through the defoaming ring 506. During the injection molding operation, the push rod 401 rotates to drive the adapter block 402 to move horizontally on the inner wall of the support tube 208. The pressing block 403 provided at the end of the adapter block 402 squeezes the molten material in the injection end, so that the molten material in the injection end is injected into the injection mold 101 through the injection port at the end of the injection end. During the injection process, the molten material inside the barrel 200 flows into the injection end from the connecting tube 206. When the injection is completed, the pressing block 403 is reset by the force of the reset spring 407. During the process, the pressing block 403 squeezes the molten material so that the molten material enters into the molten material hole 404. When the molten material enters into the molten material hole 404, pressure is applied to the sealing plate 505. The connecting rod 504 provided at the end of the sealing plate 505 pulls the sliding rod 502 to slide on the inner wall of the column 501. At this time, the sealing plate 505 is away from the end of the extension nozzle 406. The molten material flows into the injection end close to the injection mold 101 through the defoaming ring 506. During the movement of the molten material, a filter screen is provided inside the defoaming ring 506. The bubbles in the molten material are eliminated through the filter screen, thereby ensuring the injection quality of the product during the injection molding operation.

[0053] A second object of the present invention is to provide a plastic injection molding method, comprising any one of the above-mentioned plastic injection molding devices, comprising the following steps:

[0054] S1, pouring raw material particles into the silo 201, stirring the raw material particles through the stirring assembly 300 to disperse the agglomerated particles;

[0055] S2. The feeding screw 205 is driven to rotate by the output motor 204, and the molten material heated inside the barrel 200 is injected into the support tube 208 through the connecting tube 206. The molten material is extruded by the injection assembly 400, so that the molten material is injected into the injection mold 101 through the injection nozzle provided at the end of the support tube 208, and the bubbles are eliminated by the injection assembly 400 provided at the end of the injection assembly 400.

[0056] 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. A plastic injection molding device, characterized in that: The invention comprises a workbench (100), wherein an injection mold (101) is arranged on the top of the workbench (100), a barrel (200) is arranged on one side of the injection mold (101), a silo (201) is arranged above the barrel (200), an electromagnetic valve (202) is arranged between the silo (201) and a heating ring (203), a stirring assembly (300) is arranged inside the silo (201), the stirring assembly (300) is used to stir plastic raw material particles so that the agglomerated particles are separated from each other, a heating ring (203) is arranged on the surface of the barrel (200), the heating ring (203) is used to heat the inside of the barrel (200), an output motor (204) is arranged at the end of the barrel (200), and the output end of the output motor (204) passes through the barrel (200). ) and a feeding screw (205) is provided at the end thereof, a support tube (208) is provided below the feeding screw (205), a partition (209) is provided inside the support tube (208), the partition (209) divides the support tube (208) into an injection end and an extrusion end, a positioning block (210) is provided at the end of the partition (209), a connecting tube (206) is provided between the barrel (200) and the support tube (208), a one-way valve (207) is provided on the surface of the connecting tube (206), an injection assembly (400) is provided inside the support tube (208), the injection assembly (400) is used for pressurizing the injection into the injection mold (101), a defoaming assembly (500) is provided at the end of the injection assembly (400), and the defoaming assembly (500) is used for defoaming the molten material.

2. The plastic injection molding device according to claim 1, characterized in that: The stirring assembly (300) comprises a servo motor (301) arranged at the top of the silo (201); the output end of the servo motor (301) passes through the silo (201) and is provided with a base plate (302) at the end; a stirring rod (303) is provided at the bottom of the base plate (302); the output end of the servo motor (301) drives the stirring rod (303) to rotate to stir the raw material particles, so that the agglomerated particles collide with the inside of the barrel (200) to separate; a heating wire (211) is provided inside the silo (201); the heating wire (211) is used to heat and soften the inside of the raw material particles after the heating is completed.

3. The plastic injection molding device according to claim 2, characterized in that: Scrapers (304) are rotatably provided on both sides of the base plate (302), a torsion spring (305) is provided between the base plate (302) and the scraper (304), and the scraper (304) forms an angle of 15° with the base plate (302) under the action of the torsion spring (305), and the scraper (304) is in contact with the inner wall of the silo (201) when rotating.

4. The plastic injection molding device according to claim 1, characterized in that: The injection assembly (400) includes a push rod (401) arranged at the extrusion end, an adapter block (402) is arranged on one side of the push rod (401), the adapter block (402) passes through the partition (209) and a pressure block (403) is arranged at the end thereof, and the push rod (401) is rotated to push the adapter block (402) to move inside the injection end to extrude the molten material, so that the molten material is injected into the injection mold (101) through the injection nozzle at the injection end for injection molding.

5. The plastic injection molding device according to claim 4, characterized in that: A return spring (407) is provided between the adapter block (402) and the partition (209). When the push rod (401) rotates, the end of the adapter block (402) is squeezed. The pressing block (403) provided at the end of the adapter block (402) is reciprocated inside the injection end by the force of the return spring (407), and the molten material is repeatedly injected into the injection mold (101). The pressing block (403) is adapted to the positioning block (210) on the side close to the partition (209).

6. The plastic injection molding device according to claim 5, characterized in that: An extension nozzle (406) is provided at the end of the pressing block (403), and a melt hole (404) is provided on the inner wall of the pressing block (403). When the melt hole (404) stops extruding the melt inside the injection end and injecting it into the injection mold (101), the melt hole (404) moves horizontally in the opposite direction under the action of a return spring (407), so that the melt inside the silo (201) enters the injection end close to the injection mold (101) through the melt hole (404). An injection groove (405) is provided on the side of the pressing block (403) close to the partition (209).

7. The plastic injection molding device according to claim 1, characterized in that: The ends of the feeding screw rod (205) and the end of the push rod (401) are both provided with pulleys, the pulleys are in the same vertical plane and a transmission belt (212) is provided between the pulleys.

8. The plastic injection molding device according to claim 6, characterized in that: The inner wall of the extension nozzle (406) is provided with a slide groove, and a defoaming component (500) is slidably provided in the slide groove. When the defoaming component (500) squeezes the molten material in the injection end of the pressing block (403) to inject the injection mold (101), the defoaming component (500) and the extension nozzle (406) are in a closed state. When the injection molding is completed, the defoaming component (500) slides on the inner wall of the slide groove and is in an open state with the extension nozzle (406), and defoams the molten material.

9. The plastic injection molding device according to claim 8, characterized in that: The defoaming component (500) includes a column (501) arranged on the inner wall of the slide groove, the inner wall of the column (501) is slidably provided with a slide rod (502), a compression spring (503) is provided between the slide rods (502), a connecting rod (504) is provided at the end of the slide rod (502), and a sealing plate (505) is provided at the end of the connecting rod (504), and the sealing plate (505) is used to seal the end of the extension nozzle (406). The surface of the sealing plate (505) is provided with through holes, and the through holes are arranged in a circular array. A defoaming ring (506) is provided at the through hole. When the molten material passes through the molten material hole (404) to extrude the sealing plate (505), the molten material flows out through the defoaming ring (506).

10. A plastic injection molding method, implemented by the plastic injection molding device according to any one of claims 1 to 9, characterized in that: The steps include: S1, pouring raw material particles into the material bin (201), and stirring the raw material particles by a stirring assembly (300) to disperse the agglomerated particles; S2. The feeding screw (205) is driven to rotate by the output motor (204), and the molten material heated and melted inside the barrel (200) is injected into the support tube (208) through the connecting tube (206), and the molten material is extruded by the injection assembly (400), so that the molten material is injected into the injection mold (101) through the injection nozzle provided at the end of the support tube (208), and the bubbles are eliminated by the injection assembly (400) provided at the end of the injection assembly (400).

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