Injection device of plastic injection molding machine

Abstract

The present invention relates to the field of plastic processing technology, and specifically to an injection device of a plastic injection molding machine, comprising: a base plate; an injection mold, wherein the injection mold comprises a movable mold and a fixed mold, wherein a cavity is formed between the movable mold and the fixed mold after the molds are closed, wherein two air outlet grooves are symmetrically provided in the fixed mold, and the inner walls of the two air outlet grooves are provided with air outlet holes connected to the molding cavity; an injection molding assembly, wherein the injection molding assembly comprises an injection barrel, wherein a stirring chamber is provided in the injection barrel, wherein a stirring shaft is provided in the stirring chamber, and wherein a plurality of electric heating rings are fixedly installed on the outer wall of the injection barrel. The present invention is such that after the threaded section of the rotating short shaft is fully engaged with the engaging square sleeve, the moving engaging square sleeve will compress the fixed sleeve to push the rotating short shaft, the telescopic frame, the ejector rod, the plug and the ejector rod to move together, and the ejector rod will be slidably connected with the inner wall of the air outlet hole to push out the plastic blocked at the air outlet hole, thereby allowing the air in the molding cavity to circulate outward effectively.

Description

Technical Field

[0001] The present 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 the large-scale production of plastic parts. It melts the plastic raw materials by heating them, injecting them into the mold and cooling them to form them.

[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, air holes or incomplete mold filling, which directly affect the quality of the product. However, in actual production, some mold designs are relatively 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 clogging the vent. Moreover, when the temperature outside the mold is low, the melted plastic tends to solidify when entering the vent, further aggravating the clogging 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;

[0004] Due to these issues, the blocked vents often fail to clear in time during mold unloading or cooling, preventing air from effectively escaping the molding cavity and ultimately leading to molding defects. Therefore, in mold design and injection molding process optimization, effectively preventing vent blockage and ensuring smooth air discharge has become a key issue in improving product quality and production efficiency. Summary of the Invention

[0005] 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 excessively fast or slow plastic injection speed in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides an injection device for a plastic injection molding machine, comprising:

[0008] base plate;

[0009] An injection mold, the injection mold comprising a movable mold and a fixed mold, wherein a cavity is formed between the movable mold and the fixed mold after the mold is closed, and 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;

[0010] An injection molding assembly includes an injection barrel, a stirring chamber is defined in the injection barrel, a stirring shaft is provided in the stirring chamber, and a plurality of electric heating rings are fixedly mounted on the outer wall of the injection barrel. When plastic particles enter the injection barrel, the electric heating rings heat the plastic particles, and the stirring shaft is driven to rotate and push the plastic to move. When the plastic is pushed to one end of the injection barrel, the stirring shaft moves as a whole to push the plastic into the molding cavity.

[0011] A vibration component, used for segmented injection and vibration during the injection process;

[0012] Viscosity adjustment component, used to detect plastic viscosity and adjust viscosity.

[0013] 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 is airtightly slidably installed on the inner wall of the molding cavity, and a plurality of guide rods are fixedly installed on the circumference of one side of the annular slide. The guide rods pass through the movable mold and are fixedly installed with a fixed plate on the movable plate. A cross bar is fixedly installed on one side of the fixed plate, and 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 wheels are symmetrically installed on the outer wall of the fixed mold. The cam is fixedly mounted on one side of the two telescopic frames, and one end of the telescopic frames is rotatably mounted on the one side of the two telescopic frames, and one end of the telescopic frames extends into the air outlet groove and is fixedly mounted on the outer wall of the plug, and a push plate slidably connected to the air outlet groove is fixedly mounted on one end of the plug and fixedly mounted on the position corresponding to the air outlet hole. One end of the telescopic frame is fixedly mounted on the

[0014] 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.

[0015] 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 the pressurized 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 pressurized 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 pressurized barrel.

[0016] 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.

[0017] Preferably, the injection barrel and the fixed mold are connected through a feed pipe, and movable bars are symmetrically installed on the outer wall of the feed pipe. A vibration ring is provided on the outer wall of the feed pipe, and two external plates are symmetrically installed on the outer wall of the vibration ring. Two pairs of limit bars are symmetrically installed on the inner wall of the vibration ring, and a movable gap is formed between each pair of limit bars. The movable bar is slidably connected to the outer wall of the feed pipe and between the limit bars.

[0018] Preferably, an air outlet is symmetrically provided in the stirring chamber at a position away from the partition, and two vent 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 vent 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 vent 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, and a sliding frame is fixedly installed on the upper end of the air intake box. 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 the air outlet pipe, the upper end of the air outlet pipe is integrally formed with an adjusting box, the upper end of the adjusting box is fixedly installed with a nozzle, and the slider is airtightly slidably connected to the inner wall of the adjusting box.

[0019] Preferably, a rotating collar is fixedly mounted on one end of the delivery pipe, a stirring blade is rotatably mounted on one end of the rotating collar, the stirring blade is rotatably connected to the delivery pipe, a sliding sleeve is slidably mounted on the inner wall of the delivery pipe and at a position away from the rotating collar, two sliders are symmetrically mounted on the outer wall of the sliding sleeve, the two sliders pass through the delivery pipe and are fixedly mounted with a sealing plate, the sealing plate is airtightly slidably connected to the outer wall of the delivery pipe, two pairs of support blocks are equidistantly mounted on the outer wall of the sealing plate and the outer wall of the delivery pipe, a detection element is fixedly mounted between each pair of support blocks, the detection element is electrically connected to the controller, and a fourth spring is fixedly mounted between one of the sliders and the delivery pipe;

[0020] The cam is secured to the bottom of the L-shaped plate and has an L-shaped bottom edge, the cam being secured to the bottom edge of the L-shaped plate and having an L-shaped bottom edge.

[0021] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0022] First, in the process of plastic blocking the air vents and the air vent grooves, 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 engaging square sleeve to be threadedly connected with the rotating short shaft, thereby driving the rotating short shaft to drive the ejector rod, the plug and the push plate to rotate, pushing 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 fully engaged with the engaging square sleeve, the moving engaging square sleeve will push the rotating short shaft, the telescopic frame, the ejector rod, the plug and the ejector rod to move together, and the ejector rod will be slidably connected to the inner wall of the air vent, pushing open the plastic blocking the air vent, so that the air in the molding cavity can effectively circulate outward.

[0023] Second, in the early stage of injection, the downward force of the telescopic drive is relatively small, and the hydraulic pressure of the extruded hydraulic oil flowing to the pressurized space and the flow space is also 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 entry of gas during the plastic flow process, preventing bubbles, voids or uneven filling, which is crucial to avoiding molding defects such as air marks and gaps in the initial part of the plastic filling the molding cavity;

[0024] When most of the molding cavity has been filled, the downward force 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 gradual increase in injection speed can promote the flow of plastic to the complex or thin-walled areas of the mold. The acceleration at this stage helps to improve production efficiency and reduce cycle time.

[0025] Third, when the stirring shaft is driven to move back and forth, the air discharged from the air outlet will be driven into the air inlet pipe, and the air bag will expand when entering the air bag. In the process of the plastic flowing into the forming cavity through the feed pipe, the air entering the air bag will enter the adjustment box through the air outlet pipe and then be ejected outward from the nozzle. The ejected gas will blow toward the external plate, causing the external plate to shake. The nozzles on the upper end faces of the two adjustment boxes will intermittently eject gas, causing the external plate to continuously shake left and right. During the shaking process of the external plate, 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.

[0026] 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 through the pipeline into the rotating ring. 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, reducing flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 Schematic diagram of the cross-sectional structure of the injection mold of the present invention;

[0030] Figure 3 Schematic diagram of the internal structure of the injection mold of the present invention;

[0031] Figure 4 for Figure 3 A in the middle is an enlarged structural diagram;

[0032] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0033] Figure 6 Schematic diagram of the cross-sectional structure of the injection molding component of the present invention;

[0034] Figure 7 This is a schematic structural diagram of the injection molding component of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the telescopic sleeve of the present invention;

[0036] Figure 9 It is a structural schematic diagram of the vibration component of the present invention;

[0037] Figure 10 It is a structural schematic diagram of the material conveying pipe of the present invention;

[0038] Figure 11 This is a schematic diagram of the structure of the vibration assembly of the present invention when viewed from above;

[0039] Figure 12 Schematic diagram of the exploded structure of the regulating box of the present invention;

[0040] Figure 13 Schematic diagram of the structure of the viscosity adjustment component of the present invention;

[0041] Figure 14 Schematic diagram of the structure of the sliding sleeve of the present invention;

[0042] Figure 15 It is a schematic cross-sectional structural diagram of the rotating collar of the present invention.

[0043] Reference numerals: 1, bottom plate; 2, injection mold; 201, mold frame; 202, driving device; 203, movable 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, circular 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, vent pipe; 404, vibration collar; 405, external plate; 406, limit bar; 407, movable bar; 408, air inlet box; 409, air inlet pipe; 410, air bag; 411, air outlet pipe; 412, regulating 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 assembly; 501. L-shaped plate; 502. Rotating sleeve; 503. Agitating blade; 504. Sleeve; 505. Slider; 506. Sealing plate; 507. Support block; 508. Detection element; 509. Fourth spring; 510. Loading barrel; 511. Fixed bracket; 512. Air pump; 513. Feed port; 514. Heating coil; 515. Second rotary drive member; 516. Fifth spring; 517. Pressure plate; 6. Controller. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0045] The present invention will be further described below with reference to the embodiments.

[0046] Example: Refer to Figures 1 to 15 , an injection device of a plastic injection molding machine, comprising:

[0047] Base plate 1;

[0048] Injection mold 2, the injection mold 2 includes a movable mold 204 and a fixed mold 205. After the movable mold 204 and the fixed mold 205 are closed, a cavity 206 is formed between them. Two symmetrical air outlet grooves 221 are formed in the fixed mold 205. The inner walls of the two air outlet grooves 221 are provided with air outlet holes 220 that communicate with the molding cavity 206.

[0049] The injection molding assembly 3 includes an injection barrel 302, a stirring chamber 303 is defined 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 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, 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 moves as a whole to push the plastic to be injected into the molding cavity 206;

[0050] A vibration component 4, used for segmented injection and vibration during the injection process;

[0051] The viscosity adjustment component 5 is used to detect the viscosity of the plastic and adjust the viscosity.

[0052] Reference Figures 2 to 5, a mold frame 201 is fixedly installed on the upper end surface of the base 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 base 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 of the mold frame 201. A circular slide 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 207. The guide rods 208 pass through 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 is fixedly installed on the outer wall of the plug 218 and is slidably connected to the air outlet groove 221. A push rod 213 is fixedly installed at one end of the plug 218 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 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 to the rotating short shaft 214, a second spring 215 is fixedly installed between the circular partition and the engaging square sleeve 216, and a first spring 210 is fixedly installed between the fixed plate 209 and the movable plate 203.

[0053] 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. The outer wall of the stirring section is fixedly installed with an auger, and the outer wall of the sliding section is fixedly installed with a circular plate 305. The circular plate 305 is airtightly slidably connected to the stirring chamber 303, and a partition 306 is fixedly installed 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 306 and the injection barrel 302, and 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, and 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 liquid, gas or solid surface) into 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 end 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, and one side of the injection barrel 302 is fixedly installed with a There are two telescopic sleeves 314, and a telescopic plate 315 is slidably installed in the telescopic sleeves 314. A mounting plate 316 is fixedly installed between the two telescopic plates 315. A first rotary drive member 317 is fixedly installed on the side of the mounting plate 316 away from the injection barrel 302. The first rotary drive member 317 can be used with an existing rotary motor. The motor is a device that converts electrical energy into mechanical energy and can drive various mechanical equipment to complete rotation, pushing and pulling and other actions. The stirring chamber 303 passes through the injection barrel 302 and extends to one side thereof. The first rotary drive member 317 and the stirring shaft 304 are transmitted through a gear pair.

[0054] 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 limit 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 limit bars 406. A movable gap is formed between each pair of limit bars 406. The movable bar 407 is slidably connected to the outer wall of the feed pipe 402 and between the limit bars 406.

[0055] 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, and 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, and 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, and the lower end surface of the air intake box 408 is connected with an air intake pipe 409, and a first one-way valve is fixedly installed in the air intake pipe 409. The lower end of the air intake pipe 409 is connected with an air bag 410, and 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. 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. 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 the lower position of 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. A nozzle is fixedly installed on the upper end of the adjusting box 412, and the slider 416 is airtightly slidably connected to the inner wall of the adjusting box 412.

[0056] Reference Figures 13 to 15 , one end of the delivery pipe 402 is fixedly installed with a rotating ring 502, and one end of the rotating ring 502 is rotatably installed with a stirring blade 503, and the stirring blade 503 is rotatably connected to the delivery pipe 402. A sliding sleeve 504 is slidably installed on the inner wall of the delivery pipe 402 and at a position away from the rotating ring 502. Two sliders 505 are symmetrically installed on the outer wall of the sliding sleeve 504. The two sliders 505 pass through the delivery pipe 402 and are fixedly installed with a sealing plate 506. The sealing plate 506 is in airtight sliding connection with the outer wall of the delivery pipe 402. The outer wall of the sealing plate 506 Two pairs of support blocks 507 are mounted equidistantly from the outer wall of the feed pipe 402. A displacement detection element 508 is fixedly mounted between each pair of support blocks 507. The displacement detection element 508 can be an existing inductive displacement sensor. An inductive displacement sensor is an internally disposed iron core. When the core moves axially within the sensor, changes in the magnetic field cause changes in the induced current in the secondary coil. The displacement detection element 508 is electrically connected to the controller 6. A fourth spring 509 is fixedly mounted between one of the sliders 505 and the feed pipe 402.

[0057] 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 rotary drive member 515 is fixedly installed in the lower position of the L-shaped plate 501. The second rotary drive member 515 is electrically connected to the controller 6. The second rotary drive member 515 is electrically connected to the controller 6. There is a belt transmission connection between the component 515 and the stirring blade 503. A fixing frame 511 is fixedly installed on both sides of the L-shaped plate 501 and at the 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 bucket 510 through a pipeline. A heating coil 514 is fixedly installed at a lower position on one side of the mold frame 201. The heating coil 514 is an existing device, which is a device that generates heat through electric current. 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 bucket 510.

[0058] The working principle of the present invention is as follows:

[0059] First, molten plastic: by conveying the plastic raw material into the injection barrel 302, entering 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 the plastic 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 flows to the end of the stirring chamber 303 away from the pressurized barrel 312, and squeezes 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 rotary drive 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. As the circular plate 305 continues to move 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 be completely pushed into the stirring chamber 303 at the end away from the pressurized barrel 312.

[0060] Second, plastic injection: by opening the telescopic drive member 311, the output end of the telescopic drive member 311 drives the piston plate 313 to slide and descend 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 then 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, causing the plastic to be injected into the molding cavity 206 through the feed pipe 402.

[0061] It should be noted that in the early stages of injection, the downward pressure of the telescopic drive member 311 is relatively small, and the hydraulic pressure of the hydraulic oil extruding the pressurized space and the flow space is also relatively small. The stirring shaft 304 is driven to inject the plastic through the feed pipe 402 into the molding cavity 206 at a relatively low flow rate. This slow injection speed in the early stages can effectively reduce the ingress of gas during the plastic flow process, preventing bubbles, voids, or uneven filling, which is crucial for avoiding molding defects such as air marks and voids.

[0062] When the molding cavity 206 is mostly filled, the downward force of the telescopic drive member 311 is driven to increase, thereby increasing the hydraulic pressure in the pressurized space and the flow space. The agitator shaft 304 is driven to increase the flow rate of the plastic injected into the molding cavity 206 through the feed pipe 402, thereby increasing the injection speed. This gradual increase in injection speed encourages the plastic to flow toward the complex or thin-walled areas of the mold. This acceleration helps improve production efficiency and reduce cycle time.

[0063] Third, vibration: the air discharged outwards through 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 outwards 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 As the plate 405 shakes, the nozzles on the upper ends of the two adjustment boxes 412 will intermittently eject gas, causing the external plate 405 to continuously shake left and right. During the shaking process, the movable bar 407 will shake in the movable gap, causing the conveying pipe 402 to vibrate (through the reasonable setting of parameters such as friction, the air force generated by the nozzle is sufficient to blow the external plate 405 to shake). This effect of increasing the vibration frequency can ensure more uniform filling of the plastic, especially in the thin-walled part of the mold, and reduce shrinkage and warping caused by uneven cooling of the plastic;

[0064] 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 provided to detect the liquid pressure in the pressurized space, so that the pressure sensor 308 sends an electrical signal, and the voltage supplied 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 drives the straight rod 415 and the slider 416 to slide in the regulating box 412, adjusting the air flow ejected from the nozzle from the air outlet pipe 411 and the regulating box 412. In the early stage of the lower injection speed, the air can be ejected from the nozzle with a small amount of air. When the injection speed is increased in the later stage, the air flow ejected from the nozzle is increased, so that the vibration ring 404 generates different vibration frequencies.

[0065] After the injection is completed, during the next stirring process of the 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;

[0066] 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. This may cause some parts of the mold to not be fully filled, resulting in short shots, resulting in incomplete products and affecting the appearance and function of the product.

[0067] When the plastic is injected into the molding cavity 206 through the feeding pipe 402, the plastic will contact the inner wall of the sliding sleeve 504. Plastics with different viscosities will have different friction forces when contacting the inner wall of the sliding sleeve 504. The different friction forces will drive the sliding sleeve 504 to move to different degrees in the feeding pipe 402. When the sliding 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 in airtight sliding connection with the outer wall of the feeding 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 sliding sleeve 504. When the displacement change of the displacement detection element 508 exceeds the preset threshold value, the controller 6 will respectively send signals to make the air pump 512 and the second rotary 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 will squeeze 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 will flow into the rotating ring 502 through the pipeline. During the process of the flow modifier being squeezed, the heating coil 514 will heat the loading barrel 510 to heat the flow modifier. At the same time, the driving end of the second rotating drive member 515 drives the stirring blade 503 to rotate through the belt to stir the plastic entering the rotating ring 502, and fuse the plastic with the flow modifier, so that the viscosity of the plastic is reduced 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 more evenly fill the molding cavity 206 during the injection molding process, reducing the flow resistance;

[0068] It should be noted that different plastics require different temperatures for melting and injection. For different plastic melting temperatures, the flow modifier needs to be heated to between 180°C and 280°C. 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.

[0069] 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 , the plug 218 and the push plate 219 rotate, and the push plate 219 pushes the plastic blocked in the air outlet 220 and the air outlet groove 221 to one side (which can be cleaned up uniformly later). After the threaded section of the rotating short shaft 214 is completely engaged with the engaging square sleeve 216, the moving engaging square sleeve 216 compresses the second spring 215 and pushes the rotating short shaft 214, the telescopic frame 212, the push rod 213, the plug 218 and the push rod 213 to move together. The push rod 213 is slidably connected to the inner wall of the air outlet 220, pushing open the plastic blocked in the air outlet 220, so that the air in the molding cavity 206 can be effectively circulated outwards. After the air outlet 220 and the air outlet groove 221 are unblocked, the air inside the molding cavity circulates outwards, and the compressed first spring 210 pushes the fixed plate 209, driving the annular slide plate to compress the plastic and restore it to its original position.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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 various embodiments of the present invention.

Claims

1. An injection device of 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), wherein a mold cavity (206) is formed between the movable mold (204) and the fixed mold (205) after mold closing, and two air outlet grooves (221) are symmetrically provided in the fixed mold (205), and air outlet holes (220) are provided on the inner walls of the two air outlet grooves (221) and are in communication with the molding cavity (206); An injection molding assembly (3), the injection molding assembly (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), the electric heating rings (309) heating the plastic particles when the plastic particles enter the injection barrel (302), the stirring shaft (304) being 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) moves as a whole to push the plastic to be injected into the molding cavity (206); A vibration component (4) for performing segmented injection and vibration during the injection process; A viscosity adjustment component (5) for detecting the viscosity of the plastic and adjusting the viscosity; 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 the 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 movable plate (203) is fixedly mounted on the output end of the driving device (202), a side of the movable plate (203) close to the mold frame (201) is fixedly connected to the movable 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 circumferential array on one side of the annular slide (207), the guide rods (208) pass through 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), and linkage rods (217) are slidably installed on the inner walls of both sides of the cross bar (211), and 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) that is 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 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 to the rotating short shaft (214), a second spring (215) is fixedly installed between the circular spacer and the engaging square sleeve (216), and a first spring (210) is fixedly installed between the fixed plate (209) and the movable plate (203).

2. The injection device of a plastic injection molding machine according to claim 1, 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 (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 (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). Both the flow space and the pressurized space are filled with hydraulic oil.

3. The injection device of a plastic injection molding machine according to claim 2, characterized in that: An opening (307) is provided in the partition (306), a pressure sensor (308) is fixedly installed on the side of the partition (306) away from the circular plate (305), and 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), and a U-shaped frame (310) is fixedly installed 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 installed on the inner top of the U-shaped frame (310), and a piston plate (313) is fixedly installed 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).

4. The injection device of a plastic injection molding machine according to claim 3, 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 rotary 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 rotary drive member (317) and the stirring shaft (304) are driven by a gear pair.

5. The injection device of a plastic injection molding machine according to claim 2, characterized in that: The injection barrel (302) and the fixed mold (205) are connected through a feed pipe (402). The outer wall of the feed pipe (402) is symmetrically provided with movable bars (407). The outer wall limiting sleeve of the feed pipe (402) is provided with a vibration collar (404). The outer wall of the vibration collar (404) is symmetrically provided with two external plates (405). The inner wall of the vibration collar (404) is symmetrically provided with two pairs of limiting bars (406). A movable gap is formed between each pair of limiting bars (406). The movable bars (407) are slidably connected to the outer wall of the feed pipe (402) and between the limiting bars (406).

6. The injection device of a plastic injection molding machine according to claim 2, characterized in that: 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 a position corresponding to the air outlet (401); the outer walls of the two vent pipes (403) are connected to 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); the lower end of the air intake pipe (409) is connected to an air bag (410); 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 (413), and 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), and 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), and the upper end of the air outlet pipe (411) is integrally formed with an adjustment box (412), and a nozzle is fixedly installed on the upper end of the adjustment box (412). The slider (416) is airtightly slidably connected to the inner wall of the adjustment box (412).

7. The injection device of a plastic injection molding machine according to claim 5, 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), and 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), and two sliders (505) are symmetrically mounted on the outer wall of the sliding sleeve (504). The two sliders (505) pass through the feed pipe (402) and A sealing plate (506) is fixedly installed, and the sealing plate (506) is airtightly slidably connected to the outer wall of the 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 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). A fourth spring (509) is fixedly installed between one of the sliders (505) and the conveying pipe (402). An L-shaped plate (501) is fixedly installed on one side of the mold frame (201), 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), 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 rotary drive member (515) is fixedly installed in the lower position of the L-shaped plate (501), and the second rotary drive member (515) The L-shaped plate (501) is electrically connected to the controller (6), and 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 a 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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