Rapid preheating servo injection molding machine

Abstract

The invention provides a rapid preheating servo injection molding machine, and relates to the technical field of injection molding machines. The rapid preheating servo injection molding machine comprises a servo injection molding machine body, a rapid heating hopper is installed on a screw feeding port of the servo injection molding machine body and comprises an outer hopper, a plurality of electric toggle top cover mechanisms are installed on the top of the outer side wall of the outer hopper, and hopper heat preservation covers are installed at the movable ends of the electric toggle top cover mechanisms; a pressure accumulation hot air assembly is installed at the position, close to the bottom, of the outer side wall of the outer hopper, and a plurality of suspension air nozzles are installed at the position, close to the upper portion, of the outer side wall of the outer hopper. According to the device, hot air can quickly and uniformly flow through plastic particles through pressure-stored hot air, so that the plastic particles can be quickly preheated, meanwhile, the hot air is repeatedly sucked through the suction dual-purpose pump, the hot air is used for dispersion of agglomerated plastic particles and heat preservation in the discharging process, and the utilization rate of the hot air is increased.

Description

[0001] This invention is a divisional application of the patent with application number 2024115195561, application date October 29, 2024, and invention name “A fast preheating servo injection molding machine”. Technical Field

[0002] The invention relates to the technical field of injection molding machines, in particular to a fast preheating servo injection molding machine. Background Art

[0003] Servo injection molding machine is an advanced equipment in the field of injection molding machine. It adopts servo motor drive system, which can accurately control the parameters such as pressure, speed and position during the injection molding process, so as to achieve efficient and precise production of plastic products. In the injection molding process, the plastic particles entering the injection molding machine need to be preheated, mainly because the physical properties of plastic particles at room temperature are not conducive to injection molding. After entering the barrel, the plastic particles that have not been preheated need to absorb a lot of heat to reach the molten state, which will prolong the injection molding cycle and reduce production efficiency. Moreover, the uneven temperature of plastic particles may lead to inconsistent melting, thus affecting the quality of plastic products.

[0004] There are many ways to preheat plastic particles, including electric heating, radiation heating, and hot air preheating. Electric heating converts electrical energy into thermal energy through heating elements such as resistance wires to heat plastic particles, but this method may have problems with uneven heating and high energy consumption. Radiation heating uses infrared and other radiation energy to heat plastic particles. Its heating speed is relatively fast, but the equipment cost is high, and the penetration into particles is limited, which may lead to a large temperature difference between the inside and outside of the particles. Hot air preheating has many advantages, which makes it unique in the preheating of plastic particles. First, hot air has good fluidity and heat transfer properties, which can evenly surround plastic particles, making the particles heated more evenly, effectively reducing product quality problems caused by uneven temperature. Secondly, hot air preheating can use the circulation of hot air to quickly transfer heat to plastic particles, greatly improving the preheating efficiency, thereby shortening the entire injection molding production cycle.

[0005] However, the plastic particles entering the preheating hopper are prone to breakage and agglomeration due to various reasons, resulting in reduced product quality. During transportation, plastic particles may be subjected to various mechanical forces, such as collision, extrusion, etc., causing some particles to break. These broken particles may affect the fluidity and uniformity of the plastic melt during the injection molding process, thereby affecting the mechanical properties and appearance quality of the product. For example, when producing precision plastic products, broken particles may cause defects on the product surface or uneven internal structure. In addition, if the plastic particles are damp during storage or transportation, the moisture will evaporate during the preheating process or react chemically with the plastic, causing the particles to agglomerate. The agglomerated particles will not only affect the uniformity of preheating, making it impossible for some particles to be fully preheated, but also may cause melt blockage, pressure instability and other problems after entering the barrel of the injection molding machine, ultimately affecting the molding quality and dimensional accuracy of the product. Based on the above viewpoints, the present invention provides a fast preheating servo injection molding machine. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a rapid preheating servo injection molding machine that uses pressurized hot air to allow the hot air to flow quickly and evenly through plastic particles, allowing the plastic particles to be quickly preheated. At the same time, the device repeatedly draws the hot air through a dual-purpose suction pump, and uses the hot air to disperse the agglomerated plastic particles and to keep them warm during the discharge process, thereby improving the utilization rate of the hot air.

[0007] To achieve the above purpose, the present invention is implemented through the following technical solutions: a fast preheating servo injection molding machine, comprising a servo injection molding machine, a fast heating hopper is installed on the screw inlet of the servo injection molding machine, the fast heating hopper includes an outer hopper, a plurality of electric elbow cover mechanisms are installed on the top of the outer wall of the outer hopper, a hopper insulation cover is installed on the movable ends of the plurality of electric elbow cover mechanisms, a pressurized hot air assembly is installed at the bottom of the outer wall of the outer hopper, a plurality of suspended air nozzles are installed at the upper position of the outer wall of the outer hopper, and a material valve is also installed between the outer hopper and the screw inlet of the servo injection molding machine; The pressurized hot air assembly includes a heat insulation cover, the upper side wall of the heat insulation cover is fixedly connected to a hot air inlet pipe, the lower inner wall of the heat insulation cover is slidably connected to a spring air pressure plate through a spring limiter, the outer side wall of the heat insulation cover and a position on one side of the spring air pressure plate are penetrated by a vibration air pipe, the other end of the vibration air pipe is fixedly connected to the conical air inlet cylinder at the bottom of the outer hopper, the outer side wall of the heat insulation cover and a position on the other side of the spring air pressure plate are penetrated by a suspension air pipe, the other end of the suspension air pipe is fixedly connected to the outside of the suspension air nozzle adjacent to it, the top of the spring air pressure plate is fixedly connected to a connecting rod, the other end of the connecting rod is fixedly connected to a top cone plate, and the top cone plate is arranged at the bottom of the hot air inlet pipe, and a one-way air intake valve for sucking air into the heat insulation cover is also installed in the middle position of the lower side wall of the heat insulation cover

[0008] Preferably, a composite pipe group is also provided in the middle position of the insulation cover, and the composite pipe group includes an inner pipe fitting, the inner pipe fitting is fixedly connected to the hopper insulation cover, the inner wall of the outer hopper is fixed with an outer pipe fitting through a bearing, the outer pipe fitting is sleeved on the outside of the inner pipe fitting and fits tightly with the outer wall of the inner pipe fitting, the top of the outer pipe fitting is fixedly connected with an outer tube gear, the upper side wall of the hopper insulation cover is installed with a gear motor group, the movable end gear of the gear motor group is meshed with the outer tube gear, the top of the inner pipe fitting is provided with a threaded groove, and the top of the outer pipe fitting is provided with a linear groove.

[0009] Preferably, the inner wall of the inner tube is fixedly connected to an air sealing plate, the lower wall of the air sealing plate is connected to an air sealing cone via a spring, the upper wall of the air sealing plate is provided with a plurality of air holes, and the outer wall of the outer tube is fixedly connected to a magnetic ring group, and the magnetic ring group and the air sealing cone are at the same height.

[0010] Preferably, the interior of the magnetic ring group is a magnetic block and the exterior includes a magnetic shielding material, and the magnetic block inside the magnetic ring group cooperates with the air sealing cone.

[0011] Preferably, a dispersing airflow sheet is fixedly connected to the bottom of the outer tube, and the dispersing airflow sheet is provided with a plurality of dispersing grooves along the outer side wall.

[0012] Preferably, the bottom of the airflow dispersing sheet is connected to a dust collecting cover via a bearing, a side wall of the dust collecting cover is connected to an air pump via a pipeline, and the air pump is installed on the outer side wall of the outer hopper.

[0013] Preferably, an air pipe is fixedly connected to the top of the inner pipe, a dual-purpose air pump for suction and extraction is arranged at the front end of the servo injection molding machine, and a dual-purpose air pump for suction and extraction is installed inside the dual-purpose air pump for suction and extraction.

[0014] Preferably, the front end of the servo injection molding machine is also provided with an insulation air box, in which an insulation box made of insulation material is installed, and a series air pipe is connected between the insulation box of the insulation air box and the suction dual-purpose pump of the suction dual-purpose air pump.

[0015] The present invention has the following technical points and beneficial effects:

[0016] 1. Inject hot air into the insulation cover through the hot air inlet pipe. When the air pressure inside the insulation cover is greater than the air pressure under the spring air pressure plate, the hot air in the insulation cover will enter the outer hopper through the vibrating air pipe and the suspension air pipe, and the gas flowing out of the suspension air pipe is the stored hot air, so that the hot air can flow through the plastic particles quickly and evenly, so that the plastic particles can be preheated quickly. At the same time, the device repeatedly sucks hot air through the suction dual-purpose pump, and uses the hot air to disperse the agglomerated plastic particles and keep them warm during the discharge process, thereby improving the utilization rate of the hot air.

[0017] 2. The stored pressure hot air drives the plastic particles in the outer hopper to oscillate, and the length of the suspension air pipe is significantly longer than that of the vibration air pipe. Therefore, the gas leading to the suspension air pipe will be ejected from the suspension air nozzle when the plastic particles oscillate, so that the vibrating part of the plastic particles located in the upper layer are blown up by the airflow. The suspension air nozzle is trumpet-shaped, so the air pressure decreases when the gas passes through it. The gravity of the complete plastic particles is significantly greater than the gas power blown out from the suspension air nozzle, and they will fall quickly. The broken, incomplete plastic particles or lighter impurities such as dust are suspended under the blowing of the gas, and their falling speed is significantly lower than that of the complete plastic particles, so that the impurities and broken plastic particles remain in the upper layer. At the same time, the larger massed plastic particles fall quickly during oscillation due to their large gravity, and they remain in the lower part of the plastic particles. After multiple rounds of air intake, the plastic particles show obvious stratification - the broken plastic particles and impurities remain in the upper layer, while the agglomerated plastic particles remain in the bottom layer.

[0018] 3. The gear motor unit drives the outer pipe to rotate continuously through the meshing relationship between its gear and the outer pipe gear. When the outer pipe rotates, the overlapping position of the linear groove and the threaded groove on the outer pipe keeps changing, and the suction pump draws air into the inner part of the outer hopper through the air pipe, so that the hot air is sucked into the insulation box in the insulation air box. As the height and position of the air inlet exposed at the top of the composite pipe group keep changing, the hot air entering the outer hopper keeps changing the airflow path when it is discharged, so that the hot air flows through the plastic particles more evenly. At the same time, the airflow drives the plastic particles at different positions to suspend and oscillate, further improving the efficiency and uniformity of the stratification work.

[0019] 4. The suction dual-purpose pump in the pump chamber will blow the hot air in the insulation air box back into the inner pipe. At this time, since the hopper insulation cover has been separated from the outer hopper, the threaded groove and the straight groove are staggered and no longer overlap. At the same time, since the air sealing cone is away from the magnetic ring group, the air sealing cone is separated from the air sealing plate under the action of the spring. At this time, the air blown into the inner pipe will flow out from the air holes of the air sealing plate and finally flow into the dispersed air flow sheet. The dispersion groove arranged on the outside of the dispersed air flow sheet has the shape characteristics of being narrow on the outside and wide on the inside. The air pressure increases when the air flows through. This allows the plastic particles to be broken up when it blows on the agglomerated plastic particles at the bottom, thereby fully preventing the agglomerated plastic particles from entering the extrusion screw part of the servo injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is an isometric schematic diagram of the present invention.

[0022] Figure 3 It is a schematic diagram of the dual-purpose air pump for suction in the present invention.

[0023] Figure 4 This is a schematic diagram of the dual-purpose air pump for suction and extraction of the present invention after the outer hopper is hidden.

[0024] Figure 5 It is a first schematic diagram of the composite pipe group and the gear motor group in the present invention.

[0025] Figure 6 This is a second schematic diagram of the composite pipe assembly and the gear motor assembly in the present invention.

[0026] Figure 7 It is a front view of the composite pipe group and the gear motor group in the present invention.

[0027] Figure 8 for Figure 7 Isometric section view along AA.

[0028] Fig. 9 It is an isometric cross-sectional view of the dual-purpose air pump for suction and extraction of the present invention.

[0029] Fig.10 for Fig. 9 A magnified schematic diagram of point B in the middle.

[0030] Fig.11 for Fig. 9 Enlarged schematic diagram of point C in the middle.

[0031] Among them, 1. Servo injection molding machine; 2. Quick heating hopper; 3. Air pipe; 4. Pump room; 5. Insulated air box; 6. Series air pipe; 21. External hopper; 22. Hopper insulation cover; 23. Gear motor assembly; 24. Composite pipe assembly; 25. Electric elbow cover mechanism; 26. Pressure storage hot air assembly; 27. Feed valve; 28. Suspended air nozzle; 241, inner pipe fitting; 242, outer pipe fitting; 243, dispersed airflow sheet; 244, dust collecting cover; 245, vacuum pump; 246, outer pipe gear; 247, magnetic ring assembly; 248, linear groove; 249, thread groove; 2410, dispersed groove; 2411, air sealing plate; 2412, air sealing cone; 261. Insulation cover; 262. Hot air inlet pipe; 263. Top cone plate; 264. Connecting rod; 265. Spring air pressure plate; 266. Vibrating air pipe; 267. Suspended air pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a fast preheating servo injection molding machine, including a servo injection molding machine 1, a quick heating hopper 2 is installed on the screw feed port of the servo injection molding machine 1, the quick heating hopper 2 includes an outer hopper 21, a plurality of electric elbow cover mechanisms 25 are installed on the top of the outer wall of the outer hopper 21, a hopper insulation cover 22 is installed on the movable end of the plurality of electric elbow cover mechanisms 25, a pressurized hot air assembly 26 is installed on the bottom of the outer wall of the outer hopper 21, a plurality of suspended air nozzles 28 are installed on the upper part of the outer wall of the outer hopper 21, and a feed valve 27 is also installed between the outer hopper 21 and the screw feed port of the servo injection molding machine 1.

[0035] like Figure 4 , Fig. 9 and Fig.11As shown, the pressurized hot air assembly 26 includes a heat preservation cover 261, the upper side wall of the heat preservation cover 261 is fixedly connected with a hot air inlet pipe 262, the lower inner wall of the heat preservation cover 261 is slidably connected with a spring air pressure plate 265 through a spring limit, the outer side wall of the heat preservation cover 261 and a position on one side of the spring air pressure plate 265 are penetrated and connected with a vibration air pipe 266, the other end of the vibration air pipe 266 is fixedly connected to the conical air inlet cylinder at the bottom of the outer hopper 21, the outer side wall of the heat preservation cover 261 and a position on the other side of the spring air pressure plate 265 are penetrated and connected with a suspension air pipe 267, the other end of the suspension air pipe 267 is fixedly connected to the outside of the suspension air nozzle 28 adjacent thereto, and the spring The top of the air pressure plate 265 is fixedly connected with a connecting rod 264, and the other end of the connecting rod 264 is fixedly connected with a top cone plate 263, which is arranged at the bottom of the hot air inlet pipe 262. A one-way air inlet valve for intake into the heat preservation cover 261 is also installed in the middle position of the lower side wall of the heat preservation cover 261. Hot air is injected into the heat preservation cover 261 through the hot air inlet pipe 262. As the volume of the hot air injected into the heat preservation cover 261 increases, the air pressure inside the heat preservation cover 261 gradually increases until the air pressure in the heat preservation cover 261 is greater than the air pressure of the gas below the spring air pressure plate 265. When the air pressure inside the heat preservation cover 261 is greater than the air pressure of the gas below the spring air pressure plate 265, Afterwards, the spring air pressure plate 265 is compressed downward under the pressure of the gas stored in the heat preservation cover 261. At this time, the hot air in the heat preservation cover 261 will enter the interior of the outer hopper 21 through the vibration air pipe 266 and the suspension air pipe 267, and the gas flowing out of the suspension air pipe 267 is the hot air after the storage, so the airflow will drive the plastic particles in the outer hopper 21 to oscillate, and the length of the suspension air pipe 267 is obviously longer than the vibration air pipe 266, so the gas leading to the suspension air pipe 267 will be ejected from the suspension air nozzle 28 when the plastic particles oscillate, so that the vibrating part of the plastic particles located on the upper layer are blown up by the airflow, and the suspension air nozzle 28 is trumpet-shaped, so the gas passes through it. When the air pressure decreases, the gravity of the complete plastic particles is obviously greater than the gas power blown out from the suspension air nozzle 28, and they will fall quickly, while the broken, incomplete plastic particles or lighter impurities such as dust are suspended under the blowing of the gas, and their falling speed is obviously lower than that of the complete plastic particles, so that the impurities and broken plastic particles remain in the upper layer. At the same time, the larger massed plastic particles fall quickly during oscillation due to their large gravity, and they remain in the lower layer of the plastic particles. After multiple rounds of air intake, the plastic particles show obvious stratification - the broken plastic particles and impurities remain in the upper layer, while the agglomerated plastic particles remain in the bottom layer.

[0036] like Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, the top of the inner pipe 241 is fixedly connected with an air delivery pipe 3, the front end of the servo injection molding machine 1 is provided with a pump chamber 4, and a suction dual-purpose pump is installed in the pump chamber 4. The front end of the servo injection molding machine 1 is also provided with a heat preservation air box 5, and a heat preservation box made of heat preservation material is installed in the heat preservation air box 5. A series air pipe 6 is connected between the heat preservation box of the heat preservation air box 5 and the suction dual-purpose pump of the pump chamber 4. A composite pipe group 24 is also provided in the middle position of the heat preservation cover 261. The composite pipe group 24 includes an inner pipe 241, an inner pipe 241 is fixedly connected to the hopper insulation cover 22, the inner wall of the outer hopper 21 is fixed with an outer pipe 242 through a bearing, the outer pipe 242 is sleeved on the outside of the inner pipe 241 and fits tightly with the outer wall of the inner pipe 241, the top of the outer pipe 242 is fixedly connected with an outer pipe gear 246, the upper side wall of the hopper insulation cover 22 is installed with a gear motor group 23, the movable end gear of the gear motor group 23 is meshed with the outer pipe gear 246, and the top of the inner pipe 241 is provided with a threaded groove 249. A linear groove 248 is provided on the top of the outer tube 242. The wheel motor unit 23 will drive the outer tube 242 to rotate continuously through the meshing relationship between its gear and the outer tube gear 246. When the outer tube 242 rotates, the overlapping position of the linear groove 248 and the threaded groove 249 on the outer tube 242 is constantly changing, which means that the height and position of the air inlet exposed at the top of the composite tube group 24 are constantly changing, and the air supply pipe 3 connected to the top of the inner tube 241 is connected to the suction dual-purpose pump inside the pump chamber 4. The suction dual-purpose pump will inhale air into the outer hopper 21 through the air supply pipe 3, so that the hot air is sucked into the insulation box in the insulation air box 5. As the height and position of the air inlet exposed at the top of the composite tube group 24 are constantly changing, the hot air entering the outer hopper 21 continuously changes the airflow path when it is discharged, so that the hot air is more uniform when flowing through the plastic particles. At the same time, the airflow will drive the plastic particles at different positions to suspend and oscillate, further improving the efficiency and uniformity of the stratification work.

[0037] Embodiment 2

[0038] like Fig. 9 and Fig.11As shown, this embodiment provides another technical solution based on the first embodiment, the inner wall of the inner tube 241 is fixedly connected with an air sealing plate 2411, the lower side wall of the air sealing plate 2411 is connected with an air sealing cone 2412 through a spring, the upper side wall of the air sealing plate 2411 is provided with a plurality of air holes, the outer wall of the outer tube 242 is fixedly connected with a magnetic ring group 247, the magnetic ring group 247 and the air sealing cone 2412 are at the same height, the interior of the magnetic ring group 247 is a magnetic block and the exterior includes a magnetic shielding material, the magnetic block inside the magnetic ring group 247 cooperates with the air sealing cone 2412, the bottom of the outer tube 242 is fixedly connected with a dispersion airflow sheet 243, the dispersion airflow sheet 243 is provided with a plurality of dispersion grooves 2410 along the outer side wall, when the stratification of the plastic particles in the outer hopper 21 is completed, the electric elbow top cover mechanism 25 will push the hopper insulation cover 22 When the hopper 21 is opened, the suction dual-purpose pump in the pump chamber 4 will blow the hot air in the insulation box 5 back into the inner pipe 241. At this time, since the hopper insulation cover 22 has been separated from the outer hopper 21, the threaded groove 249 and the straight groove 248 are staggered and no longer overlap. At the same time, since the air sealing cone 2412 is away from the magnetic ring group 247, the air sealing cone 2412 is separated from the air sealing plate 2411 under the action of the spring. At this time, the air blown into the inner pipe 241 will flow out from the air holes of the air sealing plate 2411 and finally flow into the dispersion airflow piece 243. The dispersion groove 2410 arranged on the outside of the dispersion airflow piece 243 has a narrow outer and wide inner shape. When the air flow passes through, the air pressure becomes larger. This allows the plastic particles to be broken up when it blows on the agglomerated plastic particles at the bottom, thereby fully preventing the agglomerated plastic particles from entering the extrusion screw part of the servo injection molding machine 1.

[0039] Embodiment 3

[0040] like Figure 7 and Figure 8As shown, this embodiment provides another technical solution based on the first embodiment. The bottom of the airflow dispersion sheet 243 is connected to the dust collecting cover 244 through a bearing. A vacuum pump 245 is connected to one side wall of the dust collecting cover 244 through a pipeline. The vacuum pump 245 is installed on the outer wall of the outer hopper 21. After the dispersion work is completed, the electric elbow cover mechanism 25 covers the hopper insulation cover 22 on the outer hopper 21 again. At this time, the air sealing cone 2412 is pressed into the air sealing plate 2411 again under the drive of the magnetic ring group 247, and the straight groove 248 and the threaded groove 249 overlap again. The airflow will flow out from the overlapping part of the straight groove 248 and the threaded groove 249, and the vacuum pump 245 starts to work. The plastic particles passing through the outside of the dispersed airflow sheet 243 are slightly sucked through the pipe, the dust hood 244 and the dispersed airflow sheet 243. At the same time, the hot air flowing out from the overlapping part of the straight groove 248 and the threaded groove 249 will also be sucked from the dispersed airflow sheet 243, so that the hot air circulates when the plastic particles are discharged, thereby preventing the plastic particles at the top from flowing into the extruder and failing to reach the preheating temperature due to excessive plastic particles in the hopper. At the same time, when the broken plastic particles and impurities at the top pass through the dispersed airflow sheet 243, they will be sucked into the dust hood 244 by the suction force generated by the dispersed airflow sheet 243 to prevent the broken plastic particles from mixing into the extruder, thereby improving the finished product quality of the plastic particles entering the extruder.

[0041] Working principle: The device uses a plurality of electric elbow cover mechanisms 25 to push the hopper insulation cover 22 and the outer hopper 21 to separate from each other, so that the plastic particles that need to be preheated are added into the outer hopper 21. Then, the plurality of electric elbow cover mechanisms 25 are reset, thereby driving the hopper insulation cover 22 to re-engage the top of the outer hopper 21, and then hot air is injected into the insulation cover 261 through the hot air inlet pipe 262. As the volume of hot air injected into the insulation cover 261 increases, the air pressure inside the insulation cover 261 gradually increases. , until the air pressure of the heat preservation cover 261 is greater than the air pressure of the gas below the spring air pressure plate 265, and when the air pressure inside the heat preservation cover 261 is greater than the air pressure of the gas below the spring air pressure plate 265, the spring air pressure plate 265 is compressed downward under the pressure of the gas stored inside the heat preservation cover 261. At this time, the hot air in the heat preservation cover 261 will enter the interior of the external hopper 21 from the vibrating air pipe 266 and the suspension air pipe 267, and the gas flowing out of the suspension air pipe 267 is the hot air after the storage pressure, so the airflow will drive the external hopper 21. The plastic particles in the bucket 21 oscillate, and the length of the suspension air pipe 267 is significantly longer than that of the vibration air pipe 266. Therefore, the gas leading to the suspension air pipe 267 will be ejected from the suspension air nozzle 28 when the plastic particles oscillate, so that the vibrating part of the plastic particles located in the upper layer are blown up by the airflow. The suspension air nozzle 28 is trumpet-shaped, so the air pressure decreases when the gas passes through it. The gravity of the complete plastic particles is significantly greater than the gas power blown out from the suspension air nozzle 28, and they will fall quickly. The broken, incomplete plastic particles or lighter impurities such as dust are suspended under the blowing of the gas, and their falling speed is significantly lower than that of the complete plastic particles, so that the impurities and broken plastic particles remain in the upper layer. At the same time, the larger massed plastic particles fall quickly during oscillation due to their large gravity, and they remain in the lower part of the plastic particles. After multiple rounds of air intake, the plastic particles show obvious stratification - the broken plastic particles and impurities remain in the upper layer, while the agglomerated plastic particles remain in the bottom layer.

[0042] When the hot air is poured in, the gear motor group 23 will drive the outer pipe 242 to rotate continuously through the meshing relationship between its gear and the outer pipe gear 246. When the outer pipe 242 rotates, the overlapping position of the linear groove 248 and the threaded groove 249 on the outer pipe 242 is constantly changing, which means that the height and position of the air inlet exposed at the top of the composite pipe group 24 are constantly changing, and the air supply pipe 3 connected to the top of the inner pipe 241 is connected to the suction dual-purpose pump inside the pump chamber 4. The suction dual-purpose pump will inhale air into the interior of the outer hopper 21 through the air supply pipe 3, so that the hot air is sucked into the insulation box in the insulation air box 5. As the height and position of the air inlet exposed at the top of the composite pipe group 24 are constantly changing, the hot air entering the outer hopper 21 continuously changes the airflow path when it is discharged, making the hot air more uniform when flowing through the plastic particles. At the same time, the airflow will drive the plastic particles at different positions to suspend and oscillate, further improving the efficiency and uniformity of the stratification work.

[0043] When the plastic particles are layered in the outer hopper 21, the electric elbow cover mechanism 25 will push open the hopper insulation cover 22, and the suction dual-purpose pump in the pump chamber 4 will blow the hot air in the insulation box 5 into the inner pipe 241 again. At this time, since the hopper insulation cover 22 has been separated from the outer hopper 21, the threaded groove 249 and the linear groove 248 are intertwined and no longer overlap. At the same time, since the air sealing cone 2412 is away from the magnetic ring group 247, the air sealing cone 2412 is under the action of the spring. Separated from the air sealing plate 2411, the plastic blown into the inner tube 241 will flow out of the air holes of the air sealing plate 2411 and finally flow into the dispersion airflow sheet 243. The dispersion groove 2410 arranged on the outside of the dispersion airflow sheet 243 has a narrow outer and wide inner shape. The air pressure increases when the air flows through it. This makes it possible to break up the agglomerated plastic particles at the bottom when it blows on them, thereby fully preventing the agglomerated plastic particles from entering the extrusion screw part of the servo injection molding machine 1.

[0044] After the breaking up work is completed, the electric elbow cover mechanism 25 covers the hopper insulation cover 22 on the outer hopper 21 again. At this time, the air sealing cone 2412 is pressed into the air sealing plate 2411 again under the drive of the magnetic ring group 247, and the straight groove 248 and the thread groove 249 overlap again. The air flow will flow out from the overlapping part of the straight groove 248 and the thread groove 249. At the same time, the vacuum pump 245 starts to work and generates a slight suction force on the plastic particles passing through the outside of the dispersed air flow sheet 243 through the pipeline, dust collecting hood 244 and dispersed air flow sheet 243. The hot air flowing out from the overlapping part of the straight groove 248 and the threaded groove 249 will also be sucked into the dispersed airflow piece 243, so that the hot air circulates when the plastic particles are discharged, thereby preventing the plastic particles on the top from failing to reach the preheating temperature when flowing into the extruder due to excessive plastic particles in the hopper. At the same time, when the broken plastic particles and impurities on the top pass through the dispersed airflow piece 243, they will be sucked into the dust collecting hood 244 by the suction force generated by the dispersed airflow piece 243 to prevent the broken plastic particles from mixing into the extruder, thereby improving the finished product quality of the plastic particles entering the extruder.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fast preheating servo injection molding machine, comprising a servo injection molding machine (1), characterized in that: A quick heating hopper (2) is installed on the screw inlet of the servo injection molding machine (1), and the quick heating hopper (2) includes an outer hopper (21), a plurality of electric elbow cover mechanisms (25) are installed on the top of the outer wall of the outer hopper (21), and a hopper insulation cover (22) is installed on the movable ends of the plurality of electric elbow cover mechanisms (25), a pressure storage hot air component (26) is installed at the bottom position of the outer wall of the outer hopper (21), and a plurality of suspended air nozzles (28) are installed at the upper position of the outer wall of the outer hopper (21), and a material valve (27) is also installed between the outer hopper (21) and the screw inlet of the servo injection molding machine (1); The pressure-storage hot air component (26) comprises a heat-insulating cover (261), the upper side wall of the heat-insulating cover (261) is fixedly connected to a hot air inlet pipe (262), the lower inner wall of the heat-insulating cover (261) is slidably connected to a spring air pressure plate (265) via a spring limiter, the outer side wall of the heat-insulating cover (261) and a position on one side of the spring air pressure plate (265) are penetrated and connected to a vibration air pipe (266), the other end of the vibration air pipe (266) is fixedly connected to a conical air inlet cylinder at the bottom of the outer hopper (21), the outer side wall of the heat-insulating cover (261) and a position on the spring air pressure plate (265) are penetrated and connected to the vibration air pipe (266), the other end of the vibration air pipe (266) is fixedly connected to a conical air inlet cylinder at the bottom of the outer hopper (21), A suspension air pipe (267) is connected through the other side of the air pressure plate (265); the other end of the suspension air pipe (267) is fixedly connected to the outside of the suspension air nozzle (28) adjacent thereto; a connecting rod (264) is fixedly connected to the top of the spring air pressure plate (265); the other end of the connecting rod (264) is fixedly connected to a top cone plate (263); the top cone plate (263) is arranged at the bottom of the hot air inlet pipe (262); and a one-way air inlet valve for intake of air into the interior of the heat preservation cover (261) is also installed at the middle position of the lower side wall of the heat preservation cover (261); A composite pipe group (24) is also provided in the middle of the heat-insulating cover (261), the composite pipe group (24) comprising an inner pipe member (241), the inner pipe member (241) being fixedly connected to the hopper heat-insulating cover (22), an outer pipe member (242) being fixedly connected to the inner side wall of the outer hopper (21) via a bearing, the outer pipe member (242) being sleeved on the outside of the inner pipe member (241) and tightly fitted to the outer side wall of the inner pipe member (241), an outer pipe gear (246) being fixedly connected to the top of the outer pipe member (242), a gear motor group (23) being installed on the upper side wall of the hopper heat-insulating cover (22), a movable end gear of the gear motor group (23) being meshed with the outer pipe gear (246), a threaded groove (249) being provided on the top of the inner pipe member (241), and a linear groove (248) being provided on the top of the outer pipe member (242); The inner wall of the inner tube (241) is fixedly connected to an air sealing plate (2411), the lower wall of the air sealing plate (2411) is connected to an air sealing cone (2412) via a spring, the upper wall of the air sealing plate (2411) is provided with a plurality of air holes, the outer wall of the outer tube (242) is fixedly connected to a magnetic ring group (247), and the magnetic ring group (247) and the air sealing cone (2412) are at the same height; the bottom of the outer tube (242) is fixedly connected to a dispersion airflow sheet (243), and the dispersion airflow sheet (243) is provided with a plurality of dispersion grooves (2410) along the outer wall.

2. A rapid preheating servo injection molding machine according to claim 1, characterized in that: The interior of the magnetic ring group (247) is a magnetic block, and the exterior includes a magnetic shielding material, and the magnetic block inside the magnetic ring group (247) cooperates with the gas sealing cone (2412).

3. A rapid preheating servo injection molding machine according to claim 2, characterized in that: The bottom of the airflow dispersion sheet (243) is connected to a dust collecting cover (244) via a bearing, and a vacuum pump (245) is connected to a side wall of the dust collecting cover (244) via a pipeline, and the vacuum pump (245) is installed on the outer side wall of the outer hopper (21).

4. The rapid preheating servo injection molding machine according to claim 1, characterized in that: The top of the inner pipe (241) is fixedly connected to an air delivery pipe (3), and the front end of the servo injection molding machine (1) is provided with a pump chamber (4), in which a suction and extraction dual-purpose pump is installed.

5. A rapid preheating servo injection molding machine according to claim 4, characterized in that: The front end of the servo injection molding machine (1) is also provided with a heat-insulating air box (5), in which a heat-insulating box made of heat-insulating material is installed, and a series air pipe (6) is connected between the heat-insulating box of the heat-insulating air box (5) and the suction dual-purpose pump of the pump chamber (4).

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