Injection device of plastic injection molding machine

Abstract

The invention relates to the technical field of plastic processing, in particular to an injection device of a plastic injection molding machine. The injection mold comprises a movable mold body and a fixed mold body, a cavity is formed between the movable mold body and the fixed mold body after mold closing, two air outlet grooves are symmetrically formed in the fixed mold body, and air outlet holes communicating with the forming cavity are formed in the inner walls of the two air outlet grooves; and the injection molding assembly comprises an injection barrel, a stirring cavity is formed in the injection barrel, a stirring shaft rod is arranged in the stirring cavity, and a plurality of electric heating rings are fixedly installed on the outer wall of the injection barrel. After a threaded section of a rotating short shaft is completely meshed with a meshing square sleeve, the moving meshing square sleeve compresses and pushes the rotating short shaft, a telescopic frame, an ejector rod, a plug and the ejector rod to move together, the ejector rod is in sliding connection with the inner wall of an air outlet hole, plastic blocked at the air outlet hole is ejected away, and the air outlet hole is sealed. Therefore, air in the forming cavity can effectively circulate outwards.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection device of a plastic injection molding machine. Background Art

[0002] Plastic injection molding machine is a kind of equipment commonly used in large-scale production of plastic parts. It heats and melts the plastic raw materials, injects them into the mold, and cools them into shape.

[0003] During the injection molding process, ensuring that the air in the molding cavity can be effectively discharged is a crucial step. If the air cannot be discharged smoothly, it may cause a series of adverse consequences, such as defects such as bubbles, pores or incomplete mold filling, which directly affect the quality of the product. However, in actual production, some molds are designed to be compact, or the internal shape of the molding cavity is complex, resulting in restrictions on the position and shape of the vent. During the injection molding process, the fluidity of the plastic melt may be hindered, thereby blocking the vent. Moreover, when the temperature outside the mold is low, the melted plastic tends to solidify when entering the vent, further aggravating the blockage problem. This not only hinders the smooth discharge of air, but may also cause the vent to be completely blocked, seriously affecting the molding effect of the mold; Due to these problems, the blocked vent holes are often not cleared in time when the mold is unloading or cooling, resulting in the inability to effectively discharge the air out of the molding cavity, which ultimately leads to molding defects. Therefore, in the optimization of mold design and injection molding process, how to effectively prevent the vent holes from being blocked and ensure that the air can be discharged smoothly has become a key issue in improving product quality and production efficiency. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides an injection device for a plastic injection molding machine, which can effectively solve the problem of product defects caused by too fast or too slow plastic injection speed in the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides an injection device for a plastic injection molding machine, comprising: Base plate; An injection mold, the injection mold comprising a movable mold and a fixed mold, a cavity is formed between the movable mold and the fixed mold after the molds are closed, two air outlet grooves are symmetrically provided in the fixed mold, and air outlet holes communicating with the molding cavity are provided on the inner walls of the two air outlet grooves; An injection molding component, the injection molding component comprises an injection barrel, a stirring chamber is provided in the injection barrel, a stirring shaft is provided in the stirring chamber, a plurality of electric heating rings are fixedly installed on the outer wall of the injection barrel, when plastic particles enter the injection barrel, the electric heating rings heat the plastic particles, the stirring shaft is driven to rotate and push the plastic to move, and when the plastic is pushed to one end of the injection barrel, the stirring shaft stops moving and moves as a whole to push the plastic to be injected into the molding cavity; A vibration component, used for segmented injection and vibration during the injection process; Viscosity adjustment component, used to detect plastic viscosity and adjust viscosity.

[0006] Preferably, a mold frame is fixedly installed on the upper end surface of the bottom plate, one side of the mold frame is fixedly connected to the fixed mold, a driving device is fixedly installed on the upper end surface of the bottom plate and in the mold frame, a movable plate is fixedly installed on the output end of the driving device, and the movable plate is fixedly connected to the movable mold on the side close to the mold frame, an annular slide plate is airtightly slidably installed on the inner wall of the molding cavity, a plurality of guide rods are fixedly installed in a circular array on one side of the annular slide plate, the guide rods penetrate the movable mold and the movable plate is fixedly installed with a fixed plate, a cross bar is fixedly installed on one side of the fixed plate, linkage rods are slidably installed on the inner walls of both sides of the cross bar, a triangular block is fixedly installed on the opposite side of the linkage rod, and two telescopic plates are symmetrically installed on the outer wall of the fixed mold. The yoke is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams.

[0007] Preferably, two support plates are fixedly installed on the upper end surface of the bottom plate, and the two support plates are fixedly connected to the injection barrel. The stirring shaft is divided into a stirring section and a sliding section. An auger is fixedly installed on the outer wall of the stirring section, and a circular plate is fixedly installed on the outer wall of the sliding section. The circular plate is airtightly slidably connected to the stirring chamber, and a partition is fixedly installed on the inner wall of the stirring chamber at a position away from the stirring section. A flow space is formed between the circular plate, the partition and the injection barrel, and a pressurized space is formed between the side of the partition away from the circular plate, the stirring chamber and the injection barrel, and the flow space and the pressurized space are both filled with hydraulic oil.

[0008] Preferably, an opening is provided in the partition, and a pressure sensor is fixedly installed on the side of the partition away from the circular plate, and the pressure sensor is electrically connected to a controller. The outer wall of the injection barrel is connected to a pressurizing barrel at an upper position, and a U-shaped frame is fixedly installed on the outer wall of the injection barrel and on both sides of the pressurizing barrel, a telescopic driving member is fixedly installed on the inner top end of the U-shaped frame, and a piston plate is fixedly installed on the output end of the telescopic driving member, and the piston plate is airtightly slidably connected to the inner wall of the pressurizing barrel.

[0009] Preferably, two telescopic sleeves are fixedly installed on one side of the injection barrel, a telescopic plate is slidably installed in the telescopic sleeve, a mounting plate is fixedly installed between the two telescopic plates, a first rotating drive member is fixedly installed on the side of the mounting plate away from the injection barrel, the stirring chamber passes through the injection barrel and extends to one side thereof, and the first rotating drive member and the stirring shaft are transmitted through a gear pair.

[0010] Preferably, the injection barrel is connected to the fixed mold through a feed pipe, the outer wall of the feed pipe is symmetrically equipped with movable bars, the outer wall limit sleeve of the feed pipe is provided with a vibration ring, the outer wall of the vibration ring is symmetrically equipped with two external plates, the inner wall of the vibration ring is symmetrically equipped with two pairs of limit bars, a movable gap is formed between each pair of limit bars, and the movable bar is slidably connected to the outer wall of the feed pipe and between the limit bars.

[0011] Preferably, an air outlet is symmetrically provided in the stirring chamber at a position away from the partition, two ventilation pipes are connected to the outer wall of the injection barrel at the position corresponding to the air outlet, the outer walls of the two ventilation pipes are connected with a connecting pipe, a second one-way valve is fixedly installed in the connecting pipe, an air intake box is fixedly installed at one end of the ventilation pipe, an air intake pipe is connected to the lower end surface of the air intake box, a first one-way valve is fixedly installed in the air intake pipe, an air bag is connected to the lower end of the air intake pipe, a sliding frame is fixedly installed on the upper end of the air intake box, and the A straight rod is slidably installed in the sliding frame, a sliding iron block is fixedly installed on the upper end of the straight rod, two electromagnets are symmetrically installed on the upper end surface of the sliding frame, the two electromagnets are electrically connected to the controller, a third spring is fixedly installed between the two electromagnets and the sliding iron block, a slider is fixedly installed at a lower position on one side of the straight rod, the outer wall of the air inlet box is connected to an air outlet pipe, an adjusting box is integrally formed with the upper end of the air outlet pipe, a nozzle is fixedly installed on the upper end of the adjusting box, and the slider is air-tightly slidably connected to the inner wall of the adjusting box.

[0012] Preferably, a rotating collar is fixedly mounted on one end of the feed pipe, a stirring blade is rotatably mounted on one end of the rotating collar, the stirring blade is rotatably connected to the feed pipe, a sliding sleeve is slidably mounted on the inner wall of the feed pipe and at a position away from the rotating collar, two sliding blocks are symmetrically mounted on the outer wall of the sliding sleeve, the two sliding blocks penetrate the feed pipe and are fixedly mounted with a sealing plate, the sealing plate is airtightly slidably connected to the outer wall of the feed pipe, two pairs of supporting blocks are equidistantly mounted on the outer wall of the sealing plate and the outer wall of the feed pipe, a detecting element is fixedly mounted between each pair of supporting blocks, the detecting element is electrically connected to the controller, a fourth spring is fixedly mounted between one of the sliding blocks and the feed pipe; An L-shaped plate is fixedly installed on one side of the mold frame, and a loading bucket is fixedly installed on the lower end surface of the L-shaped plate, and a pressure plate is slidably installed on the inner wall of the loading bucket, and a fifth spring is fixedly installed between the pressure plate and the loading bucket, and a feeding port is fixedly installed on the outer wall of the loading bucket, and the loading bucket is filled with a flow modifier, and the loading bucket is connected with a rotating ring through a pipeline, and a second rotating drive member is fixedly installed in the L-shaped plate and at a lower position, and the second rotating drive member is electrically connected to the controller, and the second rotating drive member is connected to the stirring fan blade with a belt transmission, and fixed frames are fixedly installed on both sides of the L-shaped plate and at an upper position, and an air pump is fixedly installed in the fixed frame, and the air pump is electrically connected to the controller, and the output end of the air pump is connected with the loading bucket through a pipeline, and a heating coil is fixedly installed at a lower position on one side of the mold frame, and the heating coil is electrically connected to the controller, and the heating end of the heating coil is sleeved on the outer wall of the loading bucket.

[0013] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: First, in the process of plastic blocking the air vent and the air vent groove, the increased air pressure in the molding cavity will push the annular slide plate and the guide rod, the fixed plate and the cross bar to move, and the cross bar will drive the linkage rod to move, and the displaced linkage rod will drive the meshing square sleeve to be threadedly connected with the rotating short shaft, thereby driving the rotating short shaft to drive the push rod, the plug and the push plate to rotate, and push the part that enters the air vent and the air vent groove to one side of the air vent groove. After the threaded section of the rotating short shaft is completely engaged with the meshing square sleeve, the moving meshing square sleeve will push the rotating short shaft, the telescopic frame, the push rod, the plug and the push rod to move together, and the push rod will be slidably connected with the inner wall of the air vent to push open the plastic blocking the air vent, so that the air in the molding cavity can effectively flow outward.

[0014] Second, in the early stage of injection, the downward pressure of the telescopic drive is small, and the hydraulic pressure of the extruded hydraulic oil flowing to the pressurized space and the flow space is relatively small. The stirring shaft is driven to make the flow rate of the plastic relatively small. This slow injection speed in the early stage can effectively reduce the gas entry during the plastic flow process, prevent bubbles, voids or uneven filling, which is very important to avoid molding defects such as air marks and gaps in the initial part of the plastic filling the molding cavity; When most of the molding cavity has been filled, the downward pressure of the telescopic drive will be driven to a greater extent, which will increase the liquid pressure in the pressurized space and the flow space, and speed up the plastic injection. This gradually increasing injection speed can prompt the plastic to flow to the complex or thin-walled areas of the mold. The acceleration at this stage helps to improve production efficiency and reduce cycle time.

[0015] Third, when the stirring shaft is driven to reciprocate, the air discharged from the air outlet will be driven into the air inlet pipe and expand the air bag when entering the air bag. When the plastic flows into the forming cavity through the feed pipe, the air entering the air bag will enter the adjusting box through the air outlet pipe and then be ejected out from the nozzle. The ejected gas will blow toward the external plate to make the external plate shake. The nozzles on the upper end faces of the two adjusting boxes will intermittently eject gas to make the external plate shake continuously left and right. When the external plate shakes, the movable bar will shake in the movable gap to make the feed pipe vibrate. This effect of increasing the vibration frequency can ensure that the plastic is filled more evenly, especially in the thin-walled part of the mold, reducing shrinkage and warping caused by uneven cooling of the plastic.

[0016] Fourth, during the process of plastic injection and displacement caused by friction with the sleeve, gas is input into the loading barrel through the air pump to increase the air pressure in the loading barrel, so that the pressure plate slides down in the loading barrel to squeeze the flow modifier, and the flow modifier flows into the rotating ring through the pipeline. During the process of the flow modifier being squeezed, the heating coil heats the loading barrel to heat the flow modifier. At the same time, the driving end of the second rotating drive member drives the stirring blade to rotate through the belt to stir the plastic entering the rotating ring, and fuse the plastic and the flow modifier together, so that the viscosity of the plastic is reduced in the process of entering the molding cavity. The flow modifier can improve the fluidity of the plastic by reducing its viscosity, so that the plastic can fill the molding cavity more evenly during the injection molding process and reduce the flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of the injection mold of the present invention; Figure 3 Schematic diagram of the internal structure of the injection mold of the present invention; Figure 4 for Figure 3 The enlarged structural diagram at A in the middle; Figure 5 for Figure 4 The enlarged structural diagram at B in the middle; Figure 6 It is a schematic cross-sectional view of the injection molding component of the present invention; Figure 7 It is a schematic diagram of the structure of the injection molding component of the present invention; Figure 8 It is a structural schematic diagram of the telescopic sleeve of the present invention; Fig. 9 It is a structural schematic diagram of the vibration component of the present invention; Fig.10 It is a structural schematic diagram of the material conveying pipe of the present invention; Fig.11 This is a schematic diagram of the structure of the vibration assembly of the present invention when viewed from above; Fig.12 It is a schematic diagram of the exploded structure of the regulating box of the present invention; Fig.13 It is a schematic diagram of the structure of the viscosity adjustment component of the present invention; Fig.14 It is a structural schematic diagram of the sliding sleeve of the present invention; Fig.15 It is a schematic cross-sectional structural diagram of the rotating sleeve of the present invention.

[0019] Reference numerals: 1, bottom plate; 2, injection mold; 201, mold frame; 202, driving device; 203, moving plate; 204, movable mold; 205, fixed mold; 206, molding cavity; 207, annular slide plate; 208, guide rod; 209, fixed plate; 210, first spring; 211, cross bar; 212, telescopic frame; 213, ejector rod; 214, rotating short shaft; 215, second spring; 216, meshing square sleeve; 217, linkage rod; 218, plug; 219 , push plate; 220, air outlet; 221, air outlet groove; 3, injection molding components; 301, support plate; 302, injection barrel; 303, stirring chamber; 304, stirring shaft; 305, round plate; 306, partition; 307, opening; 308, pressure sensor; 309, electric heating ring; 310, U-shaped frame; 311, telescopic drive member; 312, pressurized barrel; 313, piston plate; 314, telescopic sleeve; 315, telescopic plate; 316, mounting plate; 317, first Rotating drive member; 4, vibration assembly; 401, air outlet; 402, feed pipe; 403, ventilation pipe; 404, vibration collar; 405, external plate; 406, limit strip; 407, movable strip; 408, air inlet box; 409, air inlet pipe; 410, air bag; 411, air outlet pipe; 412, adjustment box; 413, sliding frame; 414, sliding iron block; 415, straight rod; 416, slider; 417, electromagnet; 418, third spring; 419, connecting pipe; 4 20. Second one-way valve; 5. Viscosity adjustment component; 501. L-shaped plate; 502. Rotating ring; 503. Agitating blade; 504. Sleeve; 505. Sliding block; 506. Sealing plate; 507. Support block; 508. Detection element; 509. Fourth spring; 510. Loading barrel; 511. Fixed frame; 512. Air pump; 513. Feed inlet; 514. Heating coil; 515. Second rotating drive member; 516. Fifth spring; 517. Pressure plate; 6. Controller. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0021] The present invention will be further described below in conjunction with the embodiments.

[0022] Example: Refer to Figures 1 to 15 , an injection device of a plastic injection molding machine, comprising: Bottom plate 1; Injection mold 2, the injection mold 2 comprises a movable mold 204 and a fixed mold 205, a cavity 206 is formed between the movable mold 204 and the fixed mold 205 after mold closing, two air outlet grooves 221 are symmetrically provided in the fixed mold 205, and air outlet holes 220 communicating with the molding cavity 206 are provided on the inner walls of the two air outlet grooves 221; The injection molding component 3 includes an injection barrel 302, a stirring chamber 303 is provided in the injection barrel 302, a stirring shaft 304 is provided in the stirring chamber 303, and a plurality of electric heating rings 309 are fixedly installed on the outer wall of the injection barrel 302. When the plastic particles enter the injection barrel 302, the electric heating rings 309 heat the plastic particles, and the stirring shaft 304 is driven to rotate and push the plastic to move. When the plastic is pushed to one end of the injection barrel 302, the stirring shaft 304 stops moving and moves as a whole to push the plastic to be injected into the molding cavity 206; A vibration component 4, used for segmented injection and vibration during the injection process; The viscosity adjustment component 5 is used to detect the viscosity of the plastic and adjust the viscosity.

[0023] Reference Figures 2 to 5A mold frame 201 is fixedly installed on the upper end surface of the bottom plate 1, and one side of the mold frame 201 is fixedly connected to the fixed mold 205. A driving device 202 is fixedly installed on the upper end surface of the bottom plate 1 and in the mold frame 201. The driving device 202 can be used with an existing linear driving device. The linear driving device is a device that can convert rotational motion into linear motion. A movable plate 203 is fixedly installed on the output end of the driving device 202. The movable plate 203 is fixedly connected to the movable mold 204 on one side close to the mold frame 201. A circular slide plate 207 is airtightly slidably installed on the inner wall of the molding cavity 206. A plurality of guide rods 208 are fixedly installed in a circular array on one side of the circular slide plate 207. The guide rods 208 penetrate the movable mold 204 and are fixedly installed with a fixed plate 209 on the movable plate 203. A cross bar 211 is fixedly installed on one side of the fixed plate 209. Linkage rods 217 are slidably installed on the inner walls of both sides of the cross bar 211. The opposite side of the linkage rod 217 is fixedly installed There is a triangular block, and two telescopic frames 212 are symmetrically installed on the outer wall of the fixed mold 205. A push rod 213 is rotatably installed on one side of the two telescopic frames 212. One end of the push rod 213 extends into the air outlet groove 221 and is fixedly installed with a plug 218. A push plate 219 slidably connected to the air outlet groove 221 is fixedly installed on the outer wall of the plug 218. The push rod 213 is fixedly installed at one end of the plug 218 and at the position corresponding to the air outlet hole 220. One end of the push rod 213 passes through the telescopic frame 2 12 and fixedly installed with a rotating short shaft 214, a circular partition plate is fixedly installed on the outer wall of the rotating short shaft 214, a threaded groove is opened on the outer wall of the rotating short shaft 214, an engaging square sleeve 216 is fixedly installed on the inner wall of one end of the linkage rod 217, the inner wall of the engaging square sleeve 216 is threadedly connected with the rotating short shaft 214, a second spring 215 is fixedly installed between the circular partition plate and the engaging square sleeve 216, and a first spring 210 is fixedly installed between the fixed plate 209 and the movable plate 203.

[0024] Reference Figures 6 to 8Two support plates 301 are fixedly installed on the upper end surface of the bottom plate 1, and the two support plates 301 are fixedly connected to the injection barrel 302. The stirring shaft 304 is divided into a stirring section and a sliding section. An auger is fixedly installed on the outer wall of the stirring section, and a circular plate 305 is fixedly installed on the outer wall of the sliding section. The circular plate 305 is airtightly slidably connected with the stirring chamber 303. A partition 306 is fixedly installed on the inner wall of the stirring chamber 303 and at a position away from the stirring section. A flow space is formed between the circular plate 305, the partition 306 and the injection barrel 302. A pressurized space is formed between the side of the partition 306 away from the circular plate 305, the stirring chamber 303 and the injection barrel 302. The flow space and the pressurized space are both filled with hydraulic oil. An opening 307 is opened in the partition 306. A pressure sensor 308 is fixedly installed on the side of the partition 306 away from the circular plate 305. The pressure sensor 308 is an existing device, which is a device that can sense and measure pressure changes. It converts physical pressure (such as pressure on a liquid, gas or solid surface) into an electrical signal or other forms of output signal. The pressure sensor 308 is electrically connected to the controller 6. The outer wall of the injection barrel 302 and the upper position are connected to the pressurizing barrel 312. The outer wall of the injection barrel 302 and the two sides of the pressurizing barrel 312 are fixedly installed with a U-shaped frame 310. The inner top of the U-shaped frame 310 is fixedly installed with a telescopic driving member 311. The output end of the telescopic driving member 311 is fixedly installed with a piston plate 313. The piston plate 313 is in airtight sliding connection with the inner wall of the pressurizing barrel 312. One side of the injection barrel 302 is fixedly installed with There are two telescopic sleeves 314, in which a telescopic plate 315 is slidably installed. A mounting plate 316 is fixedly installed between the two telescopic plates 315. A first rotating drive member 317 is fixedly installed on the side of the mounting plate 316 away from the injection barrel 302. The first rotating drive member 317 can be used with an existing rotating motor. A motor is a device that converts electrical energy into mechanical energy, and can drive various mechanical equipment to complete rotation, pushing, pulling and other actions. The stirring chamber 303 passes through the injection barrel 302 and extends to one side thereof. The first rotating drive member 317 and the stirring shaft 304 are transmitted through a gear pair.

[0025] Reference Figures 9 to 12 The injection barrel 302 is connected to the fixed mold 205 through the feed pipe 402. The outer wall of the feed pipe 402 is symmetrically installed with movable bars 407. The outer wall limiting sleeve of the feed pipe 402 is provided with a vibration ring 404. The outer wall of the vibration ring 404 is symmetrically installed with two external plates 405. The inner wall of the vibration ring 404 is symmetrically installed with two pairs of limiting bars 406. A movable gap is formed between each pair of limiting bars 406. The movable bar 407 is slidably connected to the outer wall of the feed pipe 402 and between the limiting bars 406.

[0026] Reference Figures 9 to 12, an air outlet 401 is symmetrically provided in the stirring chamber 303 at a position away from the partition 306, two vent pipes 403 are connected to the outer wall of the injection barrel 302 at the position corresponding to the air outlet 401, the outer walls of the two vent pipes 403 are connected with a connecting pipe 419, a second one-way valve 420 is fixedly installed in the connecting pipe 419, an air intake box 408 is fixedly installed at one end of the vent pipe 403, an air intake pipe 409 is connected to the lower end surface of the air intake box 408, a first one-way valve is fixedly installed in the air intake pipe 409, an air bag 410 is connected to the lower end of the air intake pipe 409, a sliding frame 413 is fixedly installed on the upper end of the air intake box 408, a straight rod 415 is slidably installed in the sliding frame 413, and the upper end of the straight rod 415 A sliding iron block 414 is fixedly installed, and two electromagnets 417 are symmetrically installed on the upper end surface of the sliding frame 413. The electromagnet 417 is a device that uses electric current to generate a magnetic field. Its basic principle is that when current passes through a conductor, a magnetic field will be generated around the conductor. The two electromagnets 417 are electrically connected to the controller 6, and a third spring 418 is fixedly installed between the two electromagnets 417 and the sliding iron block 414. A slider 416 is fixedly installed at a lower position on one side of the straight rod 415. The outer wall of the air inlet box 408 is connected to the air outlet pipe 411, and the upper end of the air outlet pipe 411 is integrally formed with an adjusting box 412, and a nozzle is fixedly installed on the upper end of the adjusting box 412. The slider 416 is air-tightly slidably connected to the inner wall of the adjusting box 412.

[0027] Reference Figures 13 to 15 A rotating collar 502 is fixedly installed at one end of the feed pipe 402, and a stirring blade 503 is rotatably installed at one end of the rotating collar 502. The stirring blade 503 is rotatably connected to the feed pipe 402. A sliding sleeve 504 is slidably installed on the inner wall of the feed pipe 402 and at a position away from the rotating collar 502. Two sliders 505 are symmetrically installed on the outer wall of the sliding sleeve 504. The two sliders 505 pass through the feed pipe 402 and are fixedly installed with a sealing plate 506. The sealing plate 506 is slidably connected to the outer wall of the feed pipe 402 in an airtight manner. The outer wall of the sealing plate 506 Two pairs of support blocks 507 are installed equidistantly from the outer wall of the feeding pipe 402, and a displacement detection element 508 is fixedly installed between each pair of support blocks 507. The displacement detection element 508 can be used with an existing inductive displacement sensor. The inductive displacement sensor is an iron core arranged inside. When the iron core moves along the axial direction in the sensor, the change of the magnetic field causes the change of the induced current in the secondary coil. The displacement detection element 508 is electrically connected to the controller 6, and a fourth spring 509 is fixedly installed between one of the sliders 505 and the feeding pipe 402; An L-shaped plate 501 is fixedly installed on one side of the mold frame 201, and a loading barrel 510 is fixedly installed on the lower end surface of the L-shaped plate 501. A pressure plate 517 is slidably installed on the inner wall of the loading barrel 510, and a fifth spring 516 is fixedly installed between the pressure plate 517 and the loading barrel 510. A feed port 513 is fixedly installed on the outer wall of the loading barrel 510. The loading barrel 510 is filled with a flow modifier. The loading barrel 510 is connected to the rotating ring 502 through a pipeline. A second rotating drive member 515 is fixedly installed in the L-shaped plate 501 and at a lower position. The second rotating drive member 515 is electrically connected to the controller 6. The second rotating drive member 515 is electrically connected to the controller 6. Component 515 is connected to the stirring blade 503 by a belt transmission, and a fixing frame 511 is fixedly installed on both sides of the L-shaped plate 501 and at an upper position, and an air pump 512 is fixedly installed in the fixing frame 511, and the air pump 512 is electrically connected to the controller 6, and the output end of the air pump 512 is connected to the loading barrel 510 through a pipeline, and a heating coil 514 is fixedly installed at a lower position on one side of the mold frame 201, and the heating coil 514 is an existing device, which is a device that generates heat through electric current, and the heating coil 514 is electrically connected to the controller 6, and the heating end of the heating coil 514 is sleeved on the outer wall of the loading barrel 510.

[0028] The working principle of the present invention is as follows: First, molten plastic: by conveying the plastic raw material into the injection barrel 302, entering into the stirring chamber 303, turning on the electric heating ring 309 to heat the plastic raw material, turning on the first rotary drive member 317 and driving the stirring shaft 304 through the gear pair to stir in the stirring chamber 303, the plastic is stirred evenly under the stirring force of the stirring shaft 304, when the stirring shaft 304 rotates, the friction between the plastic and the inner wall of the stirring chamber 303 and the shear force of the stirring section of the stirring shaft 304 gradually flow to the end of the stirring chamber 303 away from the pressurized barrel 312, and squeeze the air in the stirring chamber 303 outward through the air outlet 401, at the same time, The stirring shaft 304 gradually moves toward the position of the pressurized barrel 312 while rotating to stir the plastic. The moving stirring shaft 304 drives the first rotating driving member 317 and the telescopic plate 315 to slide in the telescopic sleeve 314, and drives the circular plate 305 to compress the flow space, so that the hydraulic oil in the flow space flows into the pressurized space through the opening 307. When the circular plate 305 continuously moves with the stirring shaft 304, the hydraulic oil in the flow space will all flow into the pressurized space and then into the pressurized barrel 312. At this time, the plastic entering the stirring chamber 303 will all be pushed into the stirring chamber 303 at one end away from the pressurized barrel 312. Second, plastic injection: by opening the telescopic driving member 311, the output end of the telescopic driving member 311 drives the piston plate 313 to slide down in the pressurizing barrel 312. The sliding and descending piston plate 313 squeezes the hydraulic oil in the pressurizing barrel 312, causing the hydraulic oil to flow back into the pressurizing space and back into the flow space through the opening 307, thereby increasing the hydraulic pressure of the hydraulic oil in the pressurizing space and the flow space. The increased hydraulic pressure pushes the entire stirring shaft 304 to move in the stirring chamber 303, so that the plastic is injected into the molding chamber 206 through the feed pipe 402. It should be noted that, in the early stage of injection, the downward pressure of the telescopic driving member 311 is relatively small, and the hydraulic pressure of the extruded hydraulic oil to flow into the pressurized space and the flow space is also relatively small, and the stirring shaft 304 is driven to inject the plastic into the molding cavity 206 through the feed pipe 402 at a relatively low flow rate. This slow injection speed in the early stage can effectively reduce the entry of gas during the flow of the plastic, prevent bubbles, cavities or uneven filling, which is very important for avoiding molding defects such as air marks and gaps. When the molding cavity 206 is mostly filled, the downward pressure of the telescopic driving member 311 will be driven to increase, so that the hydraulic pressure of the pressurized space and the flow space will increase, and the stirring shaft 304 will be driven to make the flow rate of the plastic injected into the molding cavity 206 through the feeding pipe 402 relatively increase, so that the injection speed becomes faster. This gradual increase in injection speed prompts the plastic to flow to the complex or thin-walled area of ​​the mold. The acceleration at this stage helps to improve production efficiency and reduce cycle time. Third, vibration: the air discharged from the air outlet 401 will enter the air inlet pipe 409 through the vent pipe 403 and the air inlet box 408, and then enter the air bag 410 through the first one-way valve, so that the air bag 410 expands. In the process of the plastic flowing into the molding cavity 206 through the feeding pipe 402, the air entering the air bag 410 will enter the regulating box 412 through the air outlet pipe 411 and then be ejected outward from the nozzle. The nozzle adopts the mechanical periodic nozzle of the prior art, which can eject gas periodically. The ejected gas will blow to the external plate 405, so that the external When the plate 405 shakes, the nozzles on the upper end surfaces of the two adjustment boxes 412 will intermittently spray gas, so that the external plate 405 will shake left and right continuously. During the shaking process of the external plate 405, the movable bar 407 will shake in the movable gap to make the conveying pipe 402 vibrate (through the reasonable setting of parameters such as friction force, the air force generated by the nozzle is enough to blow the external plate 405 to shake). This effect of increasing the vibration frequency can ensure that the plastic is filled more evenly, especially in the thin-walled part of the mold, reducing the shrinkage and warping caused by uneven cooling of the plastic; It should be noted that, during the injection process, the liquid pressure in the pressurized space increases from small to large, and the pressure sensor 308 is set to detect the liquid pressure in the pressurized space, so that the pressure sensor 308 sends an electrical signal, and the voltage transmitted to the electromagnet 417 is controlled by the controller 6, so that the electromagnet 417 generates different magnetic forces, attracting the sliding iron block 414 to move, and the moving sliding iron block 414 will drive the straight rod 415 and the slider 416 to slide in the adjustment box 412, and adjust the air flow from the nozzle in the air outlet pipe 411 and the adjustment box 412. In the early stage of the lower injection speed, the air can be sprayed from the nozzle with a small amount of air, and when the injection speed is accelerated in the later stage, the air flow sprayed from the nozzle is increased to make the vibration ring 404 produce different vibration frequencies; After the injection is completed, during the next stirring shaft 304 stirring and moving the molten plastic, the outside air will enter the stirring chamber 303 again through the second one-way valve 420, the connecting pipe 419 and the air outlet 401; Fourth, reduce viscosity: During the plastic injection process, excessive viscosity will have a series of negative effects on the entire injection molding process and the quality of the final product. Plastic with excessive viscosity has poor fluidity and is difficult to quickly fill all cavities in the mold, which may cause some parts of the mold to fail to be fully filled, resulting in short shots, resulting in incomplete products, and affecting the appearance and function of the product; When the plastic is injected into the molding cavity 206 through the feed pipe 402, the plastic will contact the inner wall of the sleeve 504. Plastics with different viscosities will have different friction forces when contacting the inner wall of the sleeve 504. The different friction forces will drive the sleeve 504 to move to different degrees in the feed pipe 402. When the sleeve 504 moves, it will drive the slider 505 and the sealing plate 506 to move. When the sealing plate 506 moves, it will be airtightly slidably connected with the outer wall of the feed pipe 402, and drive the support block 507 to move while compressing the fourth spring 509, so that the displacement detection element 508 detects the displacement change of the sleeve 504. When the displacement change of the displacement detection element 508 exceeds the preset threshold, the controller 6 will respectively transmit signals to make the air pump 512, the second rotating drive member 515 and the heating coil 514 work, and the air pump 512 inputs gas to the loading barrel 5 10, the air pressure in the loading barrel 510 increases, and the increased air pressure squeezes the pressure plate 517, causing the pressure plate 517 to slide down in the loading barrel 510 to squeeze the flow modifier and stretch the fourth spring 509, and the squeezed flow modifier flows into the rotating ring 502 through the pipeline. During the squeezing of the flow modifier, the heating coil 514 heats the loading barrel 510 to heat the flow modifier. At the same time, the driving end of the second rotating driving member 515 drives the stirring blade 503 to rotate through the belt to stir the plastic entering the rotating ring 502, so as to fuse the plastic with the flow modifier, so as to reduce the viscosity of the plastic in the process of entering the molding cavity 206. The flow modifier can improve the fluidity of the plastic by reducing the viscosity of the plastic, so that the plastic can be more evenly filled in the molding cavity 206 during the injection molding process, thereby reducing the flow resistance; It should be noted that different plastics require different temperatures for melting and injection, and for different plastic melting temperatures, the flow modifier needs to be heated to between 180°C and 280°C, and the input power of the heating coil 514 can be adjusted to an input voltage that heats the loading barrel 510 to a temperature between 180°C and 280°C; Fifth, prevent exhaust blockage: when the molten plastic enters the molding cavity 206, the air in the molding cavity 206 will flow out through the air outlet 220 and the air outlet groove 221. When the air outlet 220 and the air outlet groove 221 are blocked by plastic, the air in the molding cavity 206 cannot be discharged outward, and the injected plastic will increase the air pressure in the molding cavity 206. The increased air pressure will push the annular slide plate and the guide rod 208, the fixed plate 209 and the cross bar 211 to move. When the cross bar 211 moves, it will contact the triangular block, driving the linkage rod 217 to move. The displaced linkage rod 217 will drive the meshing square sleeve 216 to be threadedly connected with the rotating short shaft 214 (the meshing square sleeve 216 and the rotating short shaft 214 adopt a non-self-locking threaded connection), so that the rotating short shaft 214 can rotate, and the rotating short shaft 214 will drive the ejector rod 213 , plug 218 and push plate 219 rotate, push plate 219 will push the plastic blocked in the air outlet 220 and the air outlet groove 221 to one side (it can be cleaned up later), after the threaded section of the rotating short shaft 214 is fully engaged with the meshing square sleeve 216, the moving meshing square sleeve 216 will compress the second spring 215 and push the rotating short shaft 214, telescopic frame 212, push rod 213, plug 218 and push rod 213 to move together, the push rod 213 will be slidably connected with the inner wall of the air outlet 220, and the plastic blocked in the air outlet 220 will be pushed open, so that the air in the molding cavity 206 can effectively circulate outward, after the air outlet 220 and the air outlet groove 221 are unblocked, the air inside the molding cavity circulates outward, and the compressed first spring 210 will push the fixed plate 209, drive the annular slide plate to compress the plastic and restore it to its original position.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection device for a plastic injection molding machine, characterized in that: include: Bottom plate (1); An injection mold (2), the injection mold (2) comprising a movable mold (204) and a fixed mold (205); a mold cavity (206) is formed between the movable mold (204) and the fixed mold (205) after mold closing; two air outlet grooves (221) are symmetrically provided in the fixed mold (205); and air outlet holes (220) communicating with the molding cavity (206) are provided on the inner walls of the two air outlet grooves (221); An injection molding component (3), the injection molding component (3) comprising an injection barrel (302), a stirring chamber (303) being provided in the injection barrel (302), a stirring shaft (304) being provided in the stirring chamber (303), a plurality of electric heating rings (309) being fixedly mounted on the outer wall of the injection barrel (302), when plastic particles enter the injection barrel (302), the electric heating rings (309) heat the plastic particles, the stirring shaft (304) is driven to rotate and push the plastic to move, and when the plastic is pushed to one end of the injection barrel (302), the stirring shaft (304) stops moving and moves as a whole to push the plastic to be injected into the molding cavity (206); A vibration component (4), used for segmented injection and vibration during the injection process; The viscosity adjustment component (5) is used to detect the viscosity of the plastic and adjust the viscosity.

2. The injection device of a plastic injection molding machine according to claim 1, characterized in that: A mold frame (201) is fixedly mounted on the upper end surface of the base plate (1), one side of the mold frame (201) is fixedly connected to a fixed mold (205), a driving device (202) is fixedly mounted on the upper end surface of the base plate (1) and inside the mold frame (201), a moving plate (203) is fixedly mounted on the output end of the driving device (202), a side of the moving plate (203) close to the mold frame (201) is fixedly connected to a moving mold (204), and an annular slide plate (203) is airtightly slidably mounted on the inner wall of the molding cavity (206). 7), a plurality of guide rods (208) are fixedly installed in a circular array on one side of the annular slide plate (207), the guide rods (208) penetrate the movable mold (204) and the movable plate (203) and are fixedly installed with a fixed plate (209), a cross bar (211) is fixedly installed on one side of the fixed plate (209), linkage rods (217) are slidably installed on the inner walls of both sides of the cross bar (211), a triangular block is fixedly installed on the opposite side of the linkage rod (217), and two telescopic frames (217) are symmetrically installed on the outer wall of the fixed mold (205). 2), a push rod (213) is rotatably mounted on one side of the two telescopic frames (212), one end of the push rod (213) extends into the air outlet groove (221) and is fixedly mounted with a plug (218), an outer wall of the plug (218) is fixedly mounted with a push plate (219) slidably connected to the air outlet groove (221), one end of the plug (218) is fixedly mounted with a push rod (213) at a position corresponding to the air outlet hole (220), one end of the push rod (213) passes through the telescopic frame (212) and is fixedly mounted with a rotating short shaft (214), a circular spacer is fixedly mounted on the outer wall of the rotating short shaft (214), a threaded groove is formed on the outer wall of the rotating short shaft (214), an engaging square sleeve (216) is fixedly mounted on the inner wall of one end of the linkage rod (217), the inner wall of the engaging square sleeve (216) is threadedly connected to the rotating short shaft (214), a second spring (215) is fixedly mounted between the circular spacer and the engaging square sleeve (216), and a first spring (210) is fixedly mounted between the fixed plate (209) and the movable plate (203).

3. The injection device of a plastic injection molding machine according to claim 2, characterized in that: Two support plates (301) are fixedly mounted on the upper end surface of the bottom plate (1), and the two support plates (301) are fixedly connected to the injection barrel (302). The stirring shaft (304) is divided into a stirring section and a sliding section. An auger is fixedly mounted on the outer wall of the stirring section, and a circular plate (305) is fixedly mounted on the outer wall of the sliding section. The circular plate (305) is airtightly slidably connected to the inside of the stirring chamber (303). A partition plate (306) is fixedly mounted on the inner wall of the stirring chamber (303) at a position away from the stirring section. A flow space is formed between the circular plate (305), the partition plate (306) and the injection barrel (302). A pressurized space is formed between the stirring chamber (303) and the injection barrel (302) on the side of the partition plate (306) away from the circular plate (305), and the two sides. The flow space and the pressurized space are both filled with hydraulic oil.

4. The injection device of a plastic injection molding machine according to claim 3, characterized in that: An opening (307) is provided in the partition (306); a pressure sensor (308) is fixedly mounted on a side of the partition (306) away from the circular plate (305); the pressure sensor (308) is electrically connected to a controller (6); the outer wall of the injection barrel (302) and the upper portion thereof are connected to a pressurizing barrel (312); a U-shaped frame (310) is fixedly mounted on the outer wall of the injection barrel (302) and on both sides of the pressurizing barrel (312); a telescopic driving member (311) is fixedly mounted on the inner top end of the U-shaped frame (310); a piston plate (313) is fixedly mounted on the output end of the telescopic driving member (311); and the piston plate (313) is airtightly slidably connected to the inner wall of the pressurizing barrel (312).

5. The injection device of a plastic injection molding machine according to claim 4, characterized in that: Two telescopic sleeves (314) are fixedly installed on one side of the injection barrel (302), a telescopic plate (315) is slidably installed in the telescopic sleeve (314), a mounting plate (316) is fixedly installed between the two telescopic plates (315), a first rotating drive member (317) is fixedly installed on the side of the mounting plate (316) away from the injection barrel (302), the stirring chamber (303) passes through the injection barrel (302) and extends to one side thereof, and the first rotating drive member (317) and the stirring shaft (304) are transmitted via a gear pair.

6. The injection device of a plastic injection molding machine according to claim 3, characterized in that: The injection barrel (302) is connected to the fixed mold (205) via a feed pipe (402); movable bars (407) are symmetrically mounted on the outer wall of the feed pipe (402); a vibration ring (404) is provided on the outer wall of the feed pipe (402); two external connecting plates (405) are symmetrically mounted on the outer wall of the vibration ring (404); two pairs of limit bars (406) are symmetrically mounted on the inner wall of the vibration ring (404); a movable gap is formed between each pair of limit bars (406); and the movable bars (407) are slidably connected to the outer wall of the feed pipe (402) and between the limit bars (406).

7. The injection device of a plastic injection molding machine according to claim 3, characterized in that: An air outlet (401) is symmetrically provided in the stirring chamber (303) at a position away from the partition (306); two ventilation pipes (403) are connected to the outer wall of the injection barrel (302) at a position corresponding to the air outlet (401); a connecting pipe (419) is connected to the outer walls of the two ventilation pipes (403); a second one-way valve (420) is fixedly installed in the connecting pipe (419); an air intake box (408) is fixedly installed at one end of the ventilation pipe (403); an air intake pipe (409) is connected to the lower end surface of the air intake box (408); a first one-way valve is fixedly installed in the air intake pipe (409); an air bag (410) is connected to the lower end of the air intake pipe (409); a sliding frame (413) is fixedly installed on the upper end of the air intake box (408); A straight rod (415) is slidably installed inside (413), a sliding iron block (414) is fixedly installed on the upper end of the straight rod (415), two electromagnets (417) are symmetrically installed on the upper end surface of the sliding frame (413), the two electromagnets (417) are electrically connected to the controller (6), a third spring (418) is fixedly installed between the two electromagnets (417) and the sliding iron block (414), a slider (416) is fixedly installed at a lower position on one side of the straight rod (415), the outer wall of the air inlet box (408) is connected to the air outlet pipe (411), the upper end of the air outlet pipe (411) is integrally formed with an adjustment box (412), the upper end of the adjustment box (412) is fixedly installed with a nozzle, and the slider (416) is airtightly slidably connected to the inner wall of the adjustment box (412).

8. The injection device of a plastic injection molding machine according to claim 6, characterized in that: A rotating collar (502) is fixedly mounted on one end of the feed pipe (402), a stirring blade (503) is rotatably mounted on one end of the rotating collar (502), the stirring blade (503) is rotatably connected to the feed pipe (402), a sliding sleeve (504) is slidably mounted on the inner wall of the feed pipe (402) at a position away from the rotating collar (502), two sliding blocks (505) are symmetrically mounted on the outer wall of the sliding sleeve (504), and the two sliding blocks (505) penetrate through the feed pipe (402) and A sealing plate (506) is fixedly installed, the sealing plate (506) is airtightly slidably connected to the outer wall of the material conveying pipe (402), two pairs of support blocks (507) are equidistantly installed on the outer wall of the sealing plate (506) and the outer wall of the material conveying pipe (402), a detection element (508) is fixedly installed between each pair of support blocks (507), the detection element (508) is electrically connected to the controller (6), and a fourth spring (509) is fixedly installed between one of the sliders (505) and the material conveying pipe (402); An L-shaped plate (501) is fixedly mounted on one side of the mold frame (201), a loading barrel (510) is fixedly mounted on the lower end surface of the L-shaped plate (501), a pressure plate (517) is slidably mounted on the inner wall of the loading barrel (510), a fifth spring (516) is fixedly mounted between the pressure plate (517) and the loading barrel (510), a feed port (513) is fixedly mounted on the outer wall of the loading barrel (510), the loading barrel (510) is filled with a flow modifier, the loading barrel (510) is connected to the rotating sleeve (502) through a pipeline, a second rotating drive member (515) is fixedly mounted inside and at a lower position of the L-shaped plate (501), and the second rotating drive member (515) The mold frame (201) is electrically connected to the controller (6); the second rotating drive member (515) is connected to the stirring blade (503) by a belt transmission; a fixing frame (511) is fixedly installed on both sides of the L-shaped plate (501) and at an upper position; an air pump (512) is fixedly installed in the fixing frame (511); the air pump (512) is electrically connected to the controller (6); the output end of the air pump (512) is connected to the loading barrel (510) through a pipeline; a heating coil (514) is fixedly installed on one side of the mold frame (201) and at a lower position; the heating coil (514) is electrically connected to the controller (6); and the heating end of the heating coil (514) is sleeved on the outer wall of the loading barrel (510).

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