CN113059748A - Injection device of injection molding machine, injection molding machine and control method of injection molding machine - Google Patents

Abstract

The invention discloses an injection device of an injection molding machine, which is connected to an injection charging barrel (1) and is used for injecting molding materials in the injection charging barrel (1) into an injection mold (3); comprises at least 2 injection nozzles (2) and a moving device for adjusting the positions of the at least 2 injection nozzles (2); the moving device comprises a first-stage moving device (4) and a second-stage moving device (5), wherein the first-stage moving device (4) drives at least 2 injection nozzles (2) to horizontally move, the second-stage moving device (5) enables each injection nozzle (2) to rotate at an angle, and the spatial positions of the injection nozzles are adjusted through two-stage movement to adapt to different injection molds. The invention solves the problems of alignment and position change of the nozzle caused by mold change in the installation process of the nozzle and the upper template, and can shorten the injection molding production period. The invention also provides an injection molding machine and a control method thereof.

Description

Injection device of injection molding machine, injection molding machine and control method of injection molding machine

Technical Field

The invention relates to the field of injection molding, in particular to an injection device of an injection molding machine, the injection molding machine and a control method thereof.

Background

With the continuous development of injection molding technology, especially the wider and wider application of double-color injection molding technology in the field of injection molding machines, the market begins to put forward new requirements, and plastic products are continuously developed towards the direction of precision, diversification, light weight and diversification. Micro-foaming injection molding is an innovative precise injection molding technology, breaks through many limitations compared with the traditional injection molding mode, improves the product quality, saves materials and reduces the cost.

Most of the existing injection molding machines are of a single-shot or double-shot structure, the injection molding period is longer, and the production efficiency is lower. When the foaming technology is applied for injection molding, because the molding material is mixed with the supercritical fluid, the injection molding material is extremely sensitive to pressure in the injection molding process, when a nozzle opens the injection molding material to enter a hot runner of a mold, the injection molding material starts to foam, after the injection molding material is injected into the mold cavity, some materials are excessively foamed because of the overlong time for filling the mold cavity, the final plastic product has overlarge foaming holes, and the performance is reduced. Therefore, the problems of long injection time and excessive foaming need to be solved, and the multi-nozzle injection molding machine can reduce the injection time and improve the injection efficiency.

When a multi-nozzle injection molding machine is applied, after one injection molding product is produced, a mold of another product needs to be replaced for production, and the position of an injection molding hole changes due to the replacement of the mold, so that the combined position of a combined nozzle needs to be manually changed. In the process, the machine needs to be stopped and reassembled, so that the production efficiency is reduced, the labor cost is improved, and certain danger is caused to workers. In the installation process of the combined nozzle and the upper template, the nozzle is too long, the through holes in the nozzle and the upper template need to keep high alignment, and under the actual condition, the nozzle has position deviation in the installation process, so that the assembly difficulty between the nozzle and the upper template is improved.

Disclosure of Invention

In order to solve the technical problem, the application provides an injection device of an injection molding machine, which solves the problems of alignment and the need of changing the position of a nozzle due to the change of a mold in the installation process of the nozzle and an upper mold plate, and simultaneously introduces a second molding material at the nozzle for multi-color injection molding.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an injection molding machine injection apparatus, includes injection nozzle, one-level mobile device, second grade mobile device, one-level mobile device and second grade mobile device all install at last injection nozzle, an injection molding machine injection apparatus two-stage motion has, injection nozzle's quantity is a plurality of, and first-level motion can let injection nozzle carry out horizontal migration through controlling one-level mobile device, and second grade motion can let injection nozzle carry out the angular rotation through second grade mobile device, through two-stage motion, can let injection nozzle carry out the position transform in space, has the suitability to the mould of difference.

The mould is provided with a signal emitter, the injection nozzle is provided with a signal receiver, whether the axis of the mould and the axis of the injection nozzle are on the same line or not is judged by feeding back a received signal to the central system, and if the axis of the mould and the axis of the injection nozzle are deviated, deviation correction can be carried out by controlling the moving device and the secondary moving device.

The injection nozzle comprises a main runner, a vertical sub-runner, a horizontal sub-runner, a valve core and a needle valve oil cylinder, wherein the number of the vertical sub-runner and the number of the horizontal runner are multiple, the number of the vertical sub-runner and the number of the horizontal runner are equal, the main runner is provided with a plurality of interfaces which are respectively in one-to-one butt joint with the vertical sub-runners, the circulation of the runners can be controlled by the valve core between the horizontal runner and the vertical sub-runner, the valve core is controlled by the needle valve oil cylinder, and the vertical sub-runner is a telescopic sleeve rod and can be adjusted in length.

Injection nozzle one-level mobile device, including sliding tray, last slide, lower slide, the sliding tray sets up inside the sprue, the interface of seting up on the sprue is on last slide, go up slide and lower slide and can slide and keep good leakproofness in the inside translation of sprue, last slide on be equipped with a plurality of interfaces of sprue, just last slide and vertical subchannel between be connected for the sphere, can realize carrying out the angle rotation around the tie point.

Injection nozzle one-level mobile device still include carousel, first connecting rod, second connecting rod, third connecting rod, fourth connecting rod, connecting piece, the carousel rotationally installs on the sprue, the one end of first connecting rod rotationally connects on the sprue, the intermediate part of first connecting rod and the one end hinged joint of second connecting rod, the other end and the carousel hinged joint of second connecting rod, the other end of first connecting rod and the one end hinged joint of third connecting rod, the other end of third connecting rod and the one end hinged joint of fourth connecting rod, go back the fixed mounting connecting piece on the fourth connecting rod, the one end fixed connection of connecting piece is at last slide.

The injection nozzle secondary moving device further comprises a motor, a positioning rod, a sliding rod, a connecting rod and a ferrule, wherein the motor is fixedly connected with the positioning rod, the positioning rod is in threaded connection with the connecting rod, the connecting rod is in hinged connection with the ferrule, the connecting rod is in hinged connection with the sliding rod, and a sliding groove is formed in the outer side of the main flow channel and used for installing the sliding rod and realizing the translation of the sliding rod.

Preferably, the injection nozzle moving device is driven by a small motor, the small motor not only saves energy and reduces emission, but also occupies a small volume and a small weight, and the displacement of the moving device can be accurately controlled.

Preferably, the upper plate is an aluminum alloy plate provided with through holes. The through holes are uniformly distributed on the die, the diameter of each through hole is slightly larger than the outer diameter of the middle part of the nozzle, and the nozzle can be installed and fixed on the upper template.

Preferably, the injection mold is also an aluminum alloy plate provided with through holes. The through hole is in an inner conical shape, the size of the through hole is equal to that of the nozzle opening, and the nozzle opening is arranged on the molding surface of the plastic product, namely the nozzle opening does not enter the mold cavity. The position of the through hole of the injection mold depends on the shape of the plastic product.

Preferably, the injection cylinder should be a two-stage injection molding machine because the number of sub-runners is increased and the main runner requires a larger flow rate due to the multi-nozzle structure.

Preferably, the molding material is PP. PP is the most widely used material in industry at present, has good processing performance and lower cost, and PP products also have wide application market.

Preferably, the supercritical fluid is nitrogen. The nitrogen is used as the gas with the largest component content in the air, has the characteristics of no pollution, good stability and the like, cannot cause industrial hazard in the micro-foaming injection molding process, simultaneously reduces industrial risk, and does not damage working equipment and workers.

Preferably, the injection nozzle is internally provided with a stirrer and a heater. The stirrer can run at high speed to uniformly mix the supercritical fluid and the molding material through physical rotation and shearing action, and the heater can provide and maintain the required temperature of the molding material in the nozzle, prevent the molding material from cooling and hardening in the nozzle and block the injection port of the nozzle.

Preferably, the injection nozzle is provided with an interface externally connected with a pipeline, the first molding material is shunted from the injection charging barrel to the interior of the injection nozzle through the main runner, the externally connected pipeline can introduce another second molding material into the interior of the injection nozzle, different molding materials are introduced into the interior of the injection nozzle to be mixed, the function of injecting different mixtures by each injection nozzle can be achieved, and the injection of the molding materials with different colors can be achieved simultaneously by introducing the molding materials with different colors.

The invention also provides a control method of the injection molding machine, which comprises the following steps:

s1: the injection mould is provided with a position signal transmitter, and the injection nozzle is provided with a position signal receiver for receiving a signal sent by the position signal transmitter and judging whether the signals are on the same axis; the injection device is provided with a moving device for adjusting the position of the nozzle, and the moving device comprises a primary moving device and a secondary moving device;

s2: the primary moving device is driven by a small motor to adjust the position of each injection nozzle in the horizontal direction, and when the injection nozzles are aligned with the injection holes of the mold in the horizontal direction, the primary moving device stops running;

s3: the secondary moving device is driven by a small motor to adjust the angle and the length of each injection nozzle, and when the hole of each injection nozzle is aligned to the injection hole of the mold on the same axis, the secondary moving device stops moving;

s4: the injection machine injects molding materials into the injection nozzle through an injection charging barrel and a material pipe, the two molding materials are uniformly mixed in the injection nozzle, the injection nozzle is opened, and the molding materials enter the interior of the mold through the nozzle;

s5: closing the opened nozzle when the molding material fills the interior of the mold; and (5) completing injection molding of one cycle after the mold is cooled and formed.

Compared with the prior art, the multi-nozzle injection molding method has the advantages that the multi-nozzle injection molding is carried out by adopting a mode of combining a plurality of nozzles and utilizing the main runner and the injection nozzle, the injection nozzle replaces a hot runner in an original mold, the mold processing cost is reduced, the injection efficiency is improved, the problems of cooling and blocking of a molding material in the hot runner and the like are solved, if the injection material is the molding material mixed with the supercritical fluid, the advanced foaming caused by the too fast pressure drop or too long runner of the supercritical fluid can be avoided, and the foaming effect of a final foaming product is improved.

Meanwhile, a moving primary moving device is arranged on the injection nozzle, a motor is used for controlling the rotary table, the movement of the material distributing rod and the material distributing port is realized through a connecting rod mechanism, the displacement of the nozzle is realized in the horizontal direction, the problem that the multi-nozzle device needs to be reassembled due to the replacement of the mold is solved, and the workload and the manual assembly cost are reduced.

The injection nozzle is also provided with a secondary moving device, the motor controls the positioning rod to realize the angle adjustment and the length adjustment of the material rod, thereby avoiding the centering problem with the upper template caused by overlong nozzle and improving the assembly efficiency in the injection molding process adjustably.

And simultaneously, the injection nozzles are designed, a second molding material is introduced at the nozzles, and the nozzles are internally stirred and mixed to realize the injection of different mixtures by different nozzles.

Drawings

FIG. 1 is a schematic view of an injection unit of an injection molding machine;

FIG. 2 is an enlarged view at I;

FIG. 3 is a sectional view of the injection nozzle and injection mold assembly;

FIG. 4 is a sectional view of the installation of the vertical runner and the main runner;

FIG. 5 is an assembled schematic view of an injection nozzle;

FIG. 6 is a schematic view of an alignment apparatus;

FIG. 7 is a schematic cross-sectional view of an injection nozzle;

FIG. 8 is a schematic view of an injection nozzle for multi-color injection molding;

fig. 9 is a flow chart illustrating a control method of the injection molding machine according to the present invention.

In the figure, 1, an injection cartridge; 2. an injection nozzle; 3. a mold; 4. a mobile device; 5. a secondary mobile device; 7. a position signal generator; 8. a position signal receiver; 9. an axis; 2-1, a main runner; 2-2, vertical sub-runners; 2-3, horizontal branch channel; 2-4, valve core; 2-5, needle valve oil cylinder; 3-1, injection holes; 4-1, a first connecting rod; 4-2, a second connecting rod; 4-3, a third connecting rod; 4-4, a fourth connecting rod; 4-5, connecting pieces; 4-6, a first motor; 4-7, a second motor; 4-8, a screw; 4-9, a turntable; 4-11, an upper slide plate; 4-12, a lower slide plate; 5-1, a third motor; 5-2, a positioning rod; 5-3, a sliding rod; 5-4, connecting rod; 5-5, a ferrule; 6-1, a material pipe; 6-2, stirring rods; 6-3, a support plate; 6-4, a slide switch; 6-5, heating coil; 6-6 parts of a heat insulation layer; 6-7, a temperature sensor;

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 6, the present invention discloses an injection device of an injection molding machine, which is connected to an injection cylinder 1, and is used for injecting a molding material in the injection cylinder into an injection mold 3, and comprises at least 2 injection nozzles 2 and a moving device for adjusting the positions of the at least 2 injection nozzles, wherein the moving device comprises a first-stage moving device 4 and a second-stage moving device 5, the first-stage moving device 4 drives the at least 2 injection nozzles 2 to horizontally move, the second-stage moving device 5 enables each injection nozzle 2 to angularly rotate, and the spatial positions of the injection nozzles 2 are adjusted through two-stage movement to adapt to different injection molds.

Preferably, as shown in fig. 6, the injection device includes a position alignment device, the alignment device includes a position signal generator 7 and a position signal receiver 8, the position signal generator 7 is fixedly installed on the injection mold 3, the position signal receiver 8 is fixedly installed on the main flow channel 2-1 of the injection nozzle 2, the position signal receiver 8 receives a signal of the position signal generator 7, whether the central axis of the injection nozzle 2 and the central axis of the injection mold 3 are on the same axis is judged, and if there is a deviation, the moving device is controlled to automatically adjust the position of the injection nozzle to correct the deviation.

According to a preferable scheme, as shown in fig. 3 and 4, the nozzle 2 comprises a main flow passage 2-1, a vertical branch flow passage 2-2, a horizontal branch flow passage 2-3, a valve core 2-4 and a needle valve oil cylinder 2-5, wherein the main flow passage 2-1 is provided with a connector which is butted with the vertical branch flow passage 2-2, the main flow passage 2-1 and the vertical branch flow passage 2-2 are connected in a spherical manner, the horizontal flow passage 2-3 is arranged inside the injection nozzle 2, the flow of the flow passages can be controlled by the valve core 2-4 between the horizontal flow passage 2-3 and the vertical branch flow passage 2-2, and the valve core 2-4 is controlled by the needle valve oil cylinder 2-5.

In a preferred embodiment, as shown in fig. 2, the primary moving device 4 comprises a sliding groove, an upper sliding plate 4-11 and a lower sliding plate 4-12, the sliding groove is arranged inside the main flow channel 2-1, the main flow channel 2-1 is provided with an interface on the upper sliding plate 4-11, and the upper sliding plate 4-11 and the lower sliding plate 4-12 can slide in a translation manner inside the main flow channel 2-1 and maintain good sealing performance.

The first-stage moving device 4 further comprises a rotary table 4-9, a first connecting rod 4-1, a second connecting rod 4-2, a third connecting rod 4-3, a fourth connecting rod 4-4 and a connecting piece 4-5, wherein the rotary table 4-9 is rotatably installed on the main flow passage 2-1, one end of the first connecting rod 4-1 is rotatably connected on the main flow passage 2-1, the middle part of the first connecting rod 4-1 is hinged with one end of the second connecting rod 4-2, the other end of the second connecting rod 4-2 is hinged with the rotary table 4-9, the other end of the first connecting rod 4-1 is hinged with one end of the third connecting rod 4-3, the other end of the third connecting rod 4-3 is hinged with one end of the fourth connecting rod 4-4, and the connecting piece 4-5 is fixedly installed on the fourth connecting rod, one end of the connecting piece 4-5 is fixedly connected with the upper sliding plate 4-11.

The secondary moving device 5 comprises a motor 5-1, a positioning rod 5-2, a sliding rod 5-3, a connecting rod 5-4 and a ferrule 5-5, wherein the motor 5-1 is fixedly connected with the positioning rod 5-2, the positioning rod 5-2 is in threaded connection with the connecting rod 5-3, the connecting rod 5-3 is in hinged connection with the ferrule 5-5, and the connecting rod 5-4 is in hinged connection with the sliding rod 5-3. The ferrule 5-5 is fixedly connected with the vertical sub-channel 2-2, and the vertical sub-channel 2-2 is a telescopic loop bar which can be adjusted in length.

In a specific embodiment, after the injection mold 3 is replaced, the position signal generator 7 sends out a signal, the signal is received by the position signal receiver 8, and the central axis of the injection nozzle 2 and the central axis of the injection mold 3 are not on the same axis 9, and a certain position error exists, the motor 4-6 is started, the motor 4-6 drives the turntable 4-9 to rotate, the turntable 4-9 drives the second connecting rod 4-2 to move, the second connecting rod 4-2 drives the first connecting rod 4-1 to rotate rightwards, the first connecting rod 4-1 drives the third connecting rod 4-3 to move rightwards, the third connecting rod 4-3 drives the fourth connecting rod 4-4 to move rightwards, because the connecting piece 4-5 is fixedly connected with the upper sliding plate 4-11 and the fourth connecting rod 4-4, the upper sliding plate 4-11 can only translate in the sliding groove in the main runner 2, therefore, the fourth connecting rod 4-4 can only translate rightwards, the upper sliding plate 4-11 can be driven by the movement energy of the fourth connecting rod 4-4 to translate rightwards, the vertical branch channel 2-2 is fixed on the upper sliding plate 4-11, the nozzle 2 is fixed on the vertical branch channel 2-2, the nozzle 2 can translate rightwards along with the upper sliding plate 4-11, the vertical branch channel 2-2 extends and retracts to adjust the vertical position after the nozzle 2 reaches the horizontal position of the mounting hole, the nozzle 2 and the mounting hole are on the same axis, and the first-stage movement is finished; starting the motor 5-1 when the second-stage movement starts, driving the position adjusting rod 5-2 to rotate by the motor 5-1, driving the sliding rod 5-3 to move to the right by the position adjusting rod 5-2, driving the sliding rod 5-3 to move to the right by the connecting rod 5-3 because the position adjusting rod 5-2 is hinged with the connecting rod 5-4, driving the connecting rod 5-4 to move to the right by the sliding rod 5-3, reducing the included angle between the connecting rod 5-4 and the upper sliding plate 4-11 because the connecting rod 5-4 is hinged with the ferrule 5-5, fixedly mounting the ferrule 5-5 on the vertical branch passage 2-2, connecting the vertical branch passage 2-2 with the spherical surface of the upper sliding plate 4-11, driving the vertical branch passage 2-2 to move along with the connecting rod 5-4, reducing the included angle between the vertical branch passage 2-, at the moment, the sliding rod 5-3 and the connecting rod 5-4 stop moving, the vertical sub-runner 2-2 is fixed at a certain inclined angle, the motor 4-7 is started, and the screw rod 4-8 rotates to drive the length of the extended vertical sub-runner 2-2 to be extended until the mounting holes on the injection nozzle 2 and the injection mould 4 are kept on the same axis.

The invention also discloses a combined injection nozzle, which has a preferable scheme, as shown in figures 5 and 7, the injection nozzle 2 further comprises a material pipe 6-1, a stirring rod 6-2, a support plate 6-3, a slide block switch 6-4, a heating coil (6-5), a heat insulation layer 6-6 and a temperature sensor 6-7, the tail part of the injection nozzle 2 is fixedly connected with a vertical sub-flow passage 2-2, a connecting port of the material pipe 6-1 is fixedly connected with the tail part of the nozzle 2, a horizontal flow passage 2-3 is arranged in the nozzle 2, the stirring rod 6-2 is rotatably arranged in the horizontal flow passage 2-3, the support plate 6-3 is fixedly arranged on the inner wall of the horizontal flow passage 2-3, the slide block switch 6-4 is arranged on the support plate 6-3 in a manner of moving left and right, and a heating ring 6-5 is fixedly arranged at the, the heat preservation layer 6-6 is arranged outside the heating coil 6-5, the temperature sensor 6-7 is fixedly arranged on the inner surface of the heat preservation layer 6-6, the leftmost surface of the nozzle 2 is overlapped with the left end face of the injection mold 3, and the nozzle 2 can be used for mixing two different injection molding materials.

In a specific embodiment, before injection, as shown in fig. 5, the injection nozzles 2 are combined, the first injection nozzle on the left adopts a mixed injection nozzle, and a slide block switch 6-4 in the injection nozzle 2 blocks the outlet at the left end of the horizontal flow channel 2-3 and is in a closed state; when the injection mold works, a molding material is injected into the nozzle 2 from the vertical sub-runner 2-2, meanwhile, a supercritical fluid is injected into the nozzle 2 from the material pipe 6-1, in the process that the molding material and the supercritical fluid are injected into the nozzle 2 together, the control system controls the motor to drive the stirring rod 6-2 to rotate at a high speed to uniformly stir the molding material and the supercritical fluid, when the stirring rod 6-2 works, the control system controls the heating coil 6-5 to heat the mixed raw material in the horizontal runner 2-3 in the nozzle 2 so as to keep the mixed raw material in a molten state, the temperature sensor 6-7 detects the internal temperature of the nozzle 2 and transmits the temperature to an upper computer in real time, the control system controls the slide block switch 6-4 to translate rightwards, opens the horizontal runner 2-3, and fills the mixed raw material into the cavity of the injection mold 3, the control system controls the slide block switch 6-4 to move leftwards, the horizontal flow channel 2-3 is blocked, namely the nozzle 2 closes the switch, and the plastic products with different materials and different colors at different parts are formed after cooling and forming.

Referring to fig. 9, fig. 9 is a schematic flow chart of a control method of an injection molding machine according to the present invention, and as shown in the figure, the method includes the steps of:

s1: the injection mould is provided with a position signal transmitter, and the injection nozzle is provided with a position signal receiver for receiving a signal sent by the position signal transmitter and judging whether the signals are on the same axis; the injection device is provided with a moving device for adjusting the position of the nozzle, and the moving device comprises a primary moving device and a secondary moving device;

s2: the primary moving device is driven by a small motor to adjust the position of each injection nozzle in the horizontal direction, and when the injection nozzles are aligned with the injection holes of the mold in the horizontal direction, the primary moving device stops running;

s3: the secondary moving device is driven by a small motor to adjust the angle and the length of each injection nozzle, and when the hole of each injection nozzle is aligned to the injection hole of the mold on the same axis, the secondary moving device stops moving;

s4: the injection machine injects molding materials into the injection nozzle through an injection charging barrel and a material pipe, the two molding materials are uniformly mixed in the injection nozzle, the injection nozzle is opened, and the molding materials enter the interior of the mold through the nozzle;

s5: closing the opened nozzle when the molding material fills the interior of the mold; and (5) completing injection molding of one cycle after the mold is cooled and formed.

In conclusion, the hot runner is omitted on the conventional injection molding runner-free mold, and the holes are used for replacing the hot runner, so that the design of the conventional runner-free mold is simplified, and the cost is saved. Because the aperture of the hot runner is small, and the length of the runner is long, when the molding material is injected into the cavity of the mold, high pressure is needed for injection, after the hot runner is cancelled and the long nozzle is used for replacing the hot runner, the injection molding efficiency is improved, the injection pressure is reduced, the equipment cost is reduced, and the production period is shortened. When carrying out the polychrome and moulding plastics, connect the polychrome feed cylinder on mainstream board, through solenoid valve control switch, not only saved the space cost of the device of moulding plastics of polychrome, and the efficiency of moulding plastics promotes, and the order of moulding plastics of polychrome simultaneously can be nimble changeable.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (16)

1. An injection unit of an injection molding machine connected to an injection cylinder (1) for injecting a molding material in the injection cylinder (1) into an injection mold (3), characterized in that: the injection mold comprises at least 2 injection nozzles (2) and a moving device for adjusting the positions of the at least 2 injection nozzles, wherein the moving device comprises a first-stage moving device (4) and a second-stage moving device (5), the first-stage moving device (4) drives the at least 2 injection nozzles (2) to horizontally move, the second-stage moving device (5) enables each injection nozzle (2) to rotate in an angle, and the spatial positions of the injection nozzles (2) are adjusted to be adapted to different injection molds through two-stage movement.

2. The injection unit of an injection molding machine according to claim 1, wherein: the injection nozzle (2) comprises a main flow channel (2-1), a vertical sub flow channel (2-2), a horizontal sub flow channel (2-3), a valve core (2-4) and a needle valve oil cylinder (2-5), wherein a connector in butt joint with the vertical sub flow channel (2-2) is arranged on the main flow channel (2-1), the main flow channel (2-1) and the vertical sub flow channel (2-2) are connected in a spherical manner, the horizontal flow channel (2-3) is arranged inside the injection nozzle (2), the flow of the flow channel can be controlled by the valve core (2-4) between the horizontal flow channel (2-3) and the vertical sub flow channel (2-2), and the valve core (2-4) is controlled by the needle valve oil cylinder (2-5).

3. The injection unit of an injection molding machine according to claim 2, wherein: the number of the vertical sub-runners (2-2) and the number of the horizontal runners (2-3) are multiple and equal.

4. The injection apparatus of an injection molding machine according to any one of claims 1 to 3, characterized in that: the injection nozzle positioning device is characterized by further comprising a position aligning device, wherein the aligning device comprises a position signal generator (7) and a position signal receiver (8), the position signal generator (7) is fixedly installed on the injection mold (3), the signal receiver (8) is fixedly installed on a main flow channel (2-1) of the injection nozzle (2), the position signal receiver (8) receives signals of the signal generator (7), whether the central axis of the injection nozzle (2) and the central axis of the injection mold (3) are on the same axis is judged, and if deviation exists, the moving device is controlled to automatically adjust the position of the injection nozzle so as to correct the deviation.

5. The injection apparatus of an injection molding machine according to claims 1, 2, characterized in that: the primary moving device (4) comprises a sliding groove, an upper sliding plate (4-11) and a lower sliding plate (4-12), the sliding groove is arranged inside the main flow channel (2-1), an interface formed on the main flow channel (2-1) is arranged on the upper sliding plate (4-11), and the upper sliding plate (4-11) and the lower sliding plate (4-12) can slide in a translation mode inside the main flow channel (2-1) and keep good sealing performance.

6. The injection unit of an injection molding machine according to claim 1, wherein: the primary moving device (4) further comprises a rotary table (4-9), a first connecting rod (4-1), a second connecting rod (4-2), a third connecting rod (4-3), a fourth connecting rod (4-4) and a connecting piece (4-5), wherein the rotary table (4-9) is rotatably installed on the main flow passage (2-1), one end of the first connecting rod (4-1) is rotatably connected to the main flow passage (2-1), the middle part of the first connecting rod (4-1) is hinged to one end of the second connecting rod (4-2), the other end of the second connecting rod (4-2) is hinged to the rotary table (4-9), the other end of the first connecting rod (4-1) is hinged to one end of the third connecting rod (4-3), and the other end of the third connecting rod (4-3) is hinged to one end of the fourth connecting rod (4-4) The fourth connecting rod is fixedly provided with a connecting piece (4-5), and one end of the connecting piece (4-5) is fixedly connected with the upper sliding plate (4-11).

7. The injection unit of an injection molding machine according to claim 1, wherein: the two-stage moving device (5) comprises a motor (5-1), a positioning rod (5-2), a sliding rod (5-3), a connecting rod (5-4) and a ferrule (5-5), the motor (5-1) is fixedly connected with the positioning rod (5-2), the positioning rod (5-2) is in threaded connection with the connecting rod (5-3), the connecting rod (5-3) is in hinged connection with the ferrule (5-5), and the connecting rod (5-4) is in hinged connection with the sliding rod (5-3).

8. The injection unit of an injection molding machine according to claim 7, wherein: the ferrule (5-5) is fixedly connected with the vertical sub-runner (2-2), and the vertical sub-runner (2-2) is a telescopic loop bar and can be adjusted in length.

9. An injection molding machine, characterized in that: the injection device comprises the injection cylinder (1) and the injection mold (3) according to any one of claims 1 to 8, wherein the injection mold (3) is provided with a plurality of injection holes (3-1), the number of the injection holes (3-1) is more than that of the injection nozzles (2), and the injection nozzles (2) can find the corresponding injection holes (3-1) in the injection mold (3) according to requirements.

10. An injection molding machine as claimed in claim 10, wherein: the material of the injection mould (3) is an aluminium alloy.

11. An injection molding machine as claimed in claim 9, wherein: the inside of the injection cylinder (1) can be a single molding material or a molding material mixed with a supercritical fluid, and a foaming plastic product is obtained by injecting the molding material mixed with the supercritical fluid.

12. The material of claim 11, wherein: the supercritical fluid may be nitrogen or carbon dioxide.

13. The foamed plastic article according to claim 11, wherein: the average diameter of the internal bubbles of the bubble structure is between 200 and 500 microns.

14. An injection nozzle as claimed in claim 9, wherein: the nozzle (2) further comprises a material pipe (6-1), a stirring rod (6-2), a support plate (6-3), a slider switch (6-4), a heating coil (6-5), a heat preservation layer (6-6) and a temperature sensor (6-7), the tail part of the injection nozzle (2) is fixedly connected with the vertical sub-flow passage (2-2), a connecting port of the material pipe (6-1) is fixedly connected with the tail part of the nozzle (2), a horizontal flow passage (2-3) is arranged in the nozzle (2), the stirring rod (6-2) is rotatably arranged in the horizontal flow passage (2-3), the support plate (6-3) is fixedly arranged on the inner wall of the horizontal flow passage (2-3), and the slider switch (6-4) is arranged on the support plate (6-3) in a manner of moving left and right, the heating ring (6-5) is fixedly arranged on the outer side of the horizontal flow channel (2-3), the heat preservation layer (6-6) is arranged outside the heating coil (6-5), the temperature sensor (6-7) is fixedly arranged on the inner surface of the heat preservation layer (6-6), the leftmost surface of the nozzle (2) is overlapped with the left end face of the injection mold (3), and the nozzle (2) can be used for mixing two different injection molding materials.

15. An injection molding machine as claimed in claim 14, wherein: when the injection nozzles (2) are used for injection, each injection nozzle (2) can independently control injection parameters for injecting another fluid injection molding material, the other fluid injection molding material can have different colors, the injection parameters can also be independently controlled, and the injection parameters comprise speed and pressure.

16. An injection molding machine control method, the injection molding machine being an injection molding machine according to any one of claims 9 to 15, characterized in that:

s1: the injection mould is provided with a position signal transmitter, and the injection nozzle is provided with a position signal receiver for receiving a signal sent by the position signal transmitter and judging whether the signals are on the same axis; the injection device is provided with a moving device for adjusting the position of the nozzle, and the moving device comprises a primary moving device and a secondary moving device;

s2: the primary moving device is driven by a small motor to adjust the position of each injection nozzle in the horizontal direction, and when the injection nozzles are aligned with the injection holes of the mold in the horizontal direction, the primary moving device stops running;

s3: the secondary moving device is driven by a small motor to adjust the angle and the length of each injection nozzle, and when the hole of each injection nozzle is aligned to the injection hole of the mold on the same axis, the secondary moving device stops moving;

s4: the injection machine injects molding materials into the injection nozzle through an injection charging barrel and a material pipe, the two molding materials are uniformly mixed in the injection nozzle, the injection nozzle is opened, and the molding materials enter the interior of the mold through the nozzle;

s5: closing the opened nozzle when the molding material fills the interior of the mold; and (5) completing injection molding of one cycle after the mold is cooled and formed.

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