Automobile light-weight injection molding part melt returning injection molding system

Abstract

The invention discloses an automobile light-weight injection molded part melt returning injection molding system, and belongs to the technical field of automobile part machining, the automobile light-weight injection molded part melt returning injection molding system comprises a rack, the right side of the top of the rack is fixedly connected with a supporting seat, the left side of the top of the rack is provided with a mold assembly, and the top of the supporting seat is provided with an injection molding assembly; and the injection molding assembly comprises a main sliding frame slidably connected to the surface of the supporting base, the left side of the main sliding frame is fixedly connected with an injection molding material cylinder, a rotatable pushing and injecting screw rod is installed in an inner cavity of the injection molding material cylinder, and the left end of the pushing and injecting screw rod is fixedly connected with a pushing and injecting head. Through cooperative use of the supporting base and the injection molding assembly, injection molding materials are fused and injected, meanwhile, the effects of multi-time injection molding and return non-return can be achieved through cooperative use of the material control assembly, finally, molding machining of injection molding parts is completed through cooperative use of the mold assembly, and the production efficiency is improved. Therefore, the purposes of preventing the gas in the mold from being exhausted in time and preventing the returned material from being lost can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts processing technology, and in particular relates to a melt return injection molding system for lightweight automotive injection molded parts. Background Technology

[0002] Lightweight injection molded parts for automobiles refer to plastic products used in the automotive manufacturing industry to reduce the overall weight of automobiles. These injection molded parts are made through optimized design and the selection of high-performance materials. They are widely used in automotive interiors, such as dashboards and seat components, as well as exterior parts, such as bumpers and body panels. Thanks to the advantages of injection molding technology, it is possible to achieve precise molding of complex shapes. At the same time, while meeting the requirements of mechanical performance and safety standards for automotive parts, the weight of components is significantly reduced, thereby improving fuel efficiency, reducing exhaust emissions, and helping the automotive industry to develop in a more environmentally friendly and efficient direction.

[0003] During the injection molding process, due to the diversity of automotive injection molded parts and the complexity of their mold runners, some edge and hidden runner locations may experience gas venting efficiency within the gas mold that cannot keep pace with the molten material injection speed when the molten material is injected rapidly. If the gas in the mold is not vented in time, it can lead to defects such as gas burn and short shots in the injection molded parts. Furthermore, when the injection screw retracts after injection is completed, it may generate a negative pressure suction force from left to right in the inner cavity of the injection barrel. This can cause the molten material that has been injected into the mold to be drawn back, resulting in material loss at the injection position of the injection molded part, affecting the quality and integrity of the injection molded part. Summary of the Invention

[0004] The purpose of this invention is to provide a melt retraction injection molding system for lightweight automotive injection molded parts to solve the above-mentioned technical problems.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A lightweight automotive injection molding part melt return injection molding system, the system includes a frame: a support base is fixedly connected to the right side of the top of the frame, a mold assembly is arranged on the left side of the top of the frame, an injection molding assembly is arranged on the top of the support base, the injection molding assembly includes a main slide slidably connected to the surface of the support base, an injection cylinder is fixedly connected to the left side of the main slide, a rotatable injection screw is installed in the inner cavity of the injection cylinder, an injection head is fixedly connected to the left end of the injection screw, a nozzle is fixedly connected to the left side of the injection cylinder, and a secondary slide is slidably connected to the inner cavity of the main slide. A main hydraulic cylinder is fixedly installed on the right side of the main slide, and the output end of the main hydraulic cylinder is fixedly connected to the auxiliary slide. A material control assembly is provided on the surface of the nozzle. The material control assembly includes a vertical slide cavity opened at the top of the nozzle cavity. A slidable main valve ball is provided in the inner cavity of the vertical slide cavity. A flow divider is installed on the front and rear sides of the nozzle. The two ends of the flow divider are respectively connected to the two sides of the nozzle cavity. A pre-injection channel is fixedly connected to the left end of the flow divider and communicates with its inner cavity. A slidable pre-injection valve ball is provided in the inner cavity of the pre-injection channel. An inclined slide cavity adapted to the pre-injection valve ball is integrally formed at the top of the inner cavity of the pre-injection channel.

[0006] Preferably, the mold assembly includes a fixed frame fixedly connected to the top left side of the frame, a hydraulic mold clamping machine is provided on the left side of the fixed frame, a fixed mold is fixedly installed on the right side of the fixed frame, and a movable mold is slidably connected to the inner cavity of the fixed frame.

[0007] Preferably, a drive motor is fixedly installed in the inner cavity of the secondary carriage, and the output shaft of the drive motor is fixedly connected to the right end of the injection screw.

[0008] Preferably, auxiliary hydraulic cylinders are fixedly installed on the right ends of the front and rear sides of the top of the frame, and the output end of the auxiliary hydraulic cylinders is fixedly connected to the main slide.

[0009] Preferably, a raw material hopper communicating with the inner cavity of the top right side of the injection molding cylinder is fixedly connected.

[0010] Preferably, a shield is threadedly connected to the top of the nozzle, and a laser rangefinder sensor is fixedly mounted on the top of the shield.

[0011] Preferably, a glass plate is embedded in the top of the nozzle, and the surface of the shield has a plurality of heat dissipation holes distributed in a ring.

[0012] Preferably, a plurality of barrel heating coils are fixedly installed on the surface of the injection molding cylinder, and a branch pipe heating coil is fixedly installed on the surface of the distribution channel.

[0013] Preferably, an exhaust groove is provided on the left side of the vertical sliding cavity.

[0014] A melt retraction injection molding system for lightweight automotive injection molded parts, the method steps of which are as follows:

[0015] Step 1: First, turn on the hydraulic clamping machine to push the movable mold, so that the movable mold and the fixed mold can close. The injection molding material is introduced into the inner cavity of the material hopper. Turn on the drive motor, and the drive motor starts and drives the injection screw to rotate in the inner cavity of the injection cylinder. This causes the injection plastic in the inner cavity of the material hopper to enter the inner cavity of the injection cylinder. At the same time, the cylinder heating coil and the branch heating coil are activated and generate heat. At this time, the injection plastic in the inner cavity of the injection cylinder melts under the shearing force of the injection screw and the heat generated by the cylinder heating coil. It is then transported to the left side of the inner cavity of the injection cylinder by the spiral propulsion action of the injection cylinder, waiting for injection.

[0016] Step 2: Subsequently, the main hydraulic cylinder is activated and the auxiliary slide is advanced, causing the injection screw to slide to the left in the inner cavity of the injection cylinder, pushing the injection plastic in the inner cavity of the injection cylinder. At this time, the injection plastic enters the inner cavity of the nozzle. Under the obstruction of gravity of the main valve ball, the injection plastic first enters the inner cavity of the flow channel. The injection plastic in the inner cavity of the flow channel generates resistance to the pre-injection valve ball, causing the pre-injection valve ball to slide obliquely in the inner cavity of the inclined slide. At this time, the inner cavity of the pre-injection channel is unsealed. The injection plastic then passes through the inner cavity of the flow channel, crosses the main valve ball, and reaches the left end of the nozzle for injection. At this time, a small amount of injection plastic enters the injection channels of the fixed mold and the movable mold, performing the first injection at the edge of the channel, promoting the timely discharge of air in the inner cavity of the movable mold and the fixed mold, completing the pre-injection, and thus preventing the phenomena of air burning and short injection.

[0017] Step 3: As pre-injection is completed, the flow rate of the diversion channel cannot meet the delivery requirements of the injection plastic. The injection pressure of the injection plastic in the nozzle cavity increases. At this time, the injection pressure overcomes the weight of the main valve ball, and the main valve ball rises and enters the top of the vertical slide cavity. At this time, the nozzle cavity is fully opened, allowing a large amount of injection plastic to be injected into the channels of the fixed mold and the movable mold, completing the injection. At the same time, the laser range sensor emits a range-measuring laser vertically downward. The light passes through the glass plate and illuminates the surface of the main valve ball. Based on the range measurement value of the main valve ball, the opening size of the nozzle cavity is determined.

[0018] Step 4: After injection molding is completed, the drive motor restarts and drives the injection screw to rotate in the reverse direction inside the injection cylinder. At the same time, the main hydraulic cylinder starts and pulls the auxiliary slide to reset, thereby resetting the injection screw and reserving material storage space on the left side of the injection cylinder. During the retraction of the injection screw, a negative pressure suction force from left to right may be generated in the injection cylinder. At the same time as the negative pressure suction force is generated, under the combined action of the weight of the main valve ball and the pre-injection valve ball, the main valve ball and the pre-injection valve ball fall back, causing blockage in the nozzle, i.e., the pre-injection channel, thus effectively preventing material loss at the injection position of the injection molded part.

[0019] The beneficial effects of this invention are as follows: By using the support base and injection molding components together, the plastic is melted and injected. At the same time, with the help of the material control components, it can achieve the functions of multi-stage injection and backflow prevention. Finally, with the help of the mold components, the molding process of the injection molded part is completed, thereby achieving the purpose of preventing the gas in the mold from not being able to be discharged in time and the loss of return material. Attached Figure Description

[0020] The advantages of the present invention, both above and / or other aspects, will become clearer and more readily understood through the following detailed description taken in conjunction with the accompanying drawings, which are merely illustrative and do not limit the invention, wherein:

[0021] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a front view schematic diagram of an embodiment of the present invention;

[0023] Figure 3 This is a perspective view of an injection molding assembly and a material control assembly according to an embodiment of the present invention;

[0024] Figure 4 This is a perspective sectional view of an injection molding assembly and a material control assembly according to an embodiment of the present invention;

[0025] Figure 5 This is a perspective view of a support base and injection molding assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a perspective view of a material control component according to an embodiment of the present invention;

[0027] Figure 7 This is a front cross-sectional view of an injection-molded component according to an embodiment of the present invention;

[0028] Figure 8 This is one embodiment of the present invention. Figure 7 A magnified view of point A in the middle;

[0029] Figure 9This is a top cross-sectional view of a nozzle and a material control assembly according to an embodiment of the present invention;

[0030] Figure 10 This is an exploded perspective view of a nozzle and a material control assembly according to an embodiment of the present invention;

[0031] Figure 11 This is an exploded perspective view of a material control component according to an embodiment of the present invention.

[0032] In the attached diagram, the components represented by each number are as follows:

[0033] 1. Frame, 2. Support base, 3. Mold assembly, 31. Fixed frame, 32. Hydraulic clamping machine, 33. Fixed mold, 34. Movable mold, 4. Injection assembly, 41. Main slide, 42. Injection cylinder, 43. Ejector screw, 44. Ejector head, 45. Nozzle, 46. Secondary slide, 47. Drive motor, 48. Main hydraulic cylinder, 49. Secondary hydraulic cylinder, 5. Material control assembly, 51. Vertical slide, 52. Main valve ball, 53. Flow channel, 54. Pre-injection channel, 55. Pre-injection valve ball, 56. Angled slide, 57. Glass plate, 58. Shielding cover, 59. Laser rangefinder sensor, 6. Barrel heating coil, 7. Branch pipe heating coil, 8. Heat dissipation hole, 9. Raw material bin, 10. Venting groove. Detailed Implementation

[0034] In the following description, embodiments of the automotive lightweight injection molding system for melt retraction will be described with reference to the accompanying drawings.

[0035] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0036] The accompanying drawings in this specification are schematic diagrams to aid in illustrating the concept of the invention, and schematically show the shapes of the various parts and their interrelationships. Please note that, in order to clearly demonstrate the structure of the components in the embodiments of the invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0037] Example 1: Figure 1-11This invention illustrates an embodiment of a lightweight automotive injection molding system with melt return injection molding. The system includes a frame 1: a support base 2 is fixedly connected to the right side of the top of the frame 1; a mold assembly 3 is disposed on the left side of the top of the frame 1; the mold assembly 3 includes a fixed frame 31 fixedly connected to the left side of the top of the frame 1; a hydraulic clamping machine 32 is disposed on the left side of the fixed frame 31; a fixed mold 33 is fixedly installed on the right side of the fixed frame 31; a movable mold 34 is slidably connected to the inner cavity of the fixed frame 31; an injection molding assembly 4 is disposed on the top of the support base 2; the injection molding assembly 4 includes a main slide 41 slidably connected to the surface of the support base 2; an injection cylinder 42 is fixedly connected to the left side of the main slide 41; a raw material hopper 9 communicating with the inner cavity of the injection cylinder 42 is fixedly connected to the right side of the top of the injection cylinder 42; a rotatable injection screw 43 is installed in the inner cavity of the injection cylinder 42; an injection head 44 is fixedly connected to the left end of the injection screw 43; and a nozzle 45 is fixedly connected to the left side of the injection cylinder 42. A secondary slide 46 is slidably connected to the inner cavity of the main slide 41. A main hydraulic cylinder 48 is fixedly installed on the right side of the main slide 41. The output end of the main hydraulic cylinder 48 is fixedly connected to the secondary slide 46. A material control assembly 5 is provided on the surface of the nozzle 45. The material control assembly 5 includes a vertical slide cavity 51 opened at the top of the inner cavity of the nozzle 45. An exhaust groove 10 is opened on the left side of the inner cavity of the vertical slide cavity 51. A slidable main valve ball 52 is provided in the inner cavity of the vertical slide cavity 51. Both the front and rear sides of the nozzle 45 are equipped with... The flow channel 53 has multiple barrel heating coils 6 fixedly installed on the surface of the injection cylinder 42, and a branch pipe heating coil 7 fixedly installed on the surface of the flow channel 53. The two ends of the flow channel 53 are respectively connected to the two sides of the inner cavity of the nozzle 45. The left end of the flow channel 53 is fixedly connected to a pre-injection channel 54 that communicates with its inner cavity. The inner cavity of the pre-injection channel 54 is provided with a sliding pre-injection valve ball 55, and the top of the inner cavity of the pre-injection channel 54 is integrally formed with an inclined sliding cavity 56 that matches the pre-injection valve ball 55.

[0038] Example 2: Basically the same as Example 1, but with a further improvement: A drive motor 47 is fixedly installed in the inner cavity of the auxiliary slide 46. The output shaft of the drive motor 47 is fixedly connected to the right end of the injection screw 43. Auxiliary hydraulic cylinders 49 are fixedly installed on the right ends of the front and rear sides of the top of the frame 1. The output end of the auxiliary hydraulic cylinder 49 is fixedly connected to the main slide 41. With the cooperation of the drive motor 47 and the auxiliary slide 46, the injection screw 43 is driven to rotate, so that the injection plastic can be sheared and melted in the inner cavity of the injection cylinder 42. At the same time, with the cooperation of the main hydraulic cylinder 48, the injection screw 43 can be advanced and retracted, thereby providing sufficient injection pressure to the inner cavities of the fixed mold 33 and the movable mold 34, and timely retraction to achieve continuous injection.

[0039] Example 3: Similar to Example 1, but with a further improvement: a shield 58 is threadedly connected to the top of the nozzle 45, a laser rangefinder 59 is fixedly mounted on the top of the shield 58, and a glass plate 57 is embedded in the top of the nozzle 45. Multiple annularly distributed heat dissipation holes 8 are formed on the surface of the shield 58. The shield 58 shields the monitoring path of the laser rangefinder 59, preventing interference from external environmental factors. With the combined use of the laser rangefinder 59 and the glass plate 57, the laser can be perpendicularly irradiated onto the surface of the main valve ball 52, effectively preventing the high-temperature environment inside the nozzle 45 from interfering with the detection results. Simultaneously, the heat dissipation holes 8 allow air circulation between the shield 58 and the outside environment, effectively dissipating the heat generated inside the shield 58 and ensuring the stable operation of the laser rangefinder 59.

[0040] A melt retraction injection molding system for lightweight automotive injection molded parts, the method steps of which are as follows:

[0041] Step 1: First, turn on the hydraulic clamping machine 32 to push the movable mold 34, so that the movable mold 34 and the fixed mold 33 can be closed. The injection molding material is introduced into the inner cavity of the raw material bin 9. Turn on the drive motor 47. The drive motor 47 starts and drives the injection screw 43 to rotate in the inner cavity of the injection cylinder 42, so that the injection plastic in the inner cavity of the raw material bin 9 enters the inner cavity of the injection cylinder 42. At the same time, the barrel heating coil 6 and the branch pipe heating coil 7 are activated and generate heat. At this time, the injection plastic in the inner cavity of the injection cylinder 42 melts under the shearing force of the injection screw 43 and the heat generated by the barrel heating coil 6, and is transported to the left side of the inner cavity of the injection cylinder 42 under the spiral propulsion action of the injection cylinder 42, waiting for injection.

[0042] Step 2: Subsequently, the main hydraulic cylinder 48 opens and advances the auxiliary slide 46, causing the injection screw 43 to slide to the left within the inner cavity of the injection cylinder 42, pushing the injection plastic within the inner cavity of the injection cylinder 42. At this time, the injection plastic enters the inner cavity of the nozzle 45. Under the gravity resistance of the main valve ball 52, the injection plastic first enters the inner cavity of the diversion channel 53. The injection plastic entering the inner cavity of the diversion channel 53 creates resistance to the pre-injection valve ball 55, causing the pre-injection valve ball 55 to move obliquely. An oblique sliding occurs in the inner cavity of the slide cavity 56. At this time, the inner cavity of the pre-injection channel 54 is unsealed. The injection plastic flows from the inner cavity of the branch channel 53, passes over the main valve ball 52, and reaches the left end of the nozzle 45 for injection. At this time, a small amount of injection plastic enters the injection channels of the fixed mold 33 and the movable mold 34, and performs the first injection on the channels at the edge. This promotes the timely discharge of air in the inner cavities of the movable mold 34 and the fixed mold 33, completing the pre-injection and thus preventing the occurrence of air burning and short injection.

[0043] Step 3: While the pre-injection is completed, the flow rate of the diversion channel 53 cannot meet the delivery requirements of the injection plastic. The injection pressure of the injection plastic in the inner cavity of the nozzle 45 increases. At this time, the injection pressure overcomes the weight of the main valve ball 52. The main valve ball 52 rises and enters the top of the inner cavity of the vertical slide cavity 51. At this time, the inner cavity of the nozzle 45 can be fully opened, so that a large amount of injection plastic is injected into the channels of the fixed mold 33 and the movable mold 34 to complete the injection. At the same time, the laser ranging sensor 59 emits a ranging laser vertically downward. The light passes through the glass plate 57 and shines on the surface of the main valve ball 52. Based on the ranging value of the main valve ball 52, the opening size of the inner cavity of the nozzle 45 is determined.

[0044] Step 4: After injection molding is completed, the drive motor 47 starts again and drives the injection screw 43 to rotate in the reverse direction in the inner cavity of the injection cylinder 42. At the same time, the main hydraulic cylinder 48 starts and pulls the auxiliary slide 46 to reset, thereby resetting the injection screw 43 and reserving material storage space on the left side of the inner cavity of the injection cylinder 42. During the retraction of the injection screw 43, a negative pressure suction force from left to right may be generated in the inner cavity of the injection cylinder 42. At the same time as the negative pressure suction force is generated, under the combined action of the weight of the main valve ball 52 and the pre-injection valve ball 55, the main valve ball 52 and the pre-injection valve ball 55 fall back, causing blockage in the inner cavity of the nozzle 45, i.e., the pre-injection channel 54, thereby effectively preventing the phenomenon of material loss at the injection position of the injection molded part.

[0045] In summary, this lightweight automotive injection molding system, through the combined use of support 2 and injection assembly 4, melts and injects the plastic material. Simultaneously, with the assistance of material control assembly 5, it enables multi-stage injection and backflow prevention. Finally, with the assistance of mold assembly 3, the molding process of the injection molded part is completed. This system effectively prevents the timely discharge of gas from the mold and avoids the loss of returned material.

[0046] The technical features disclosed above are not limited to the combinations of the disclosed features with other features. Those skilled in the art can also make other combinations of the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A melt back injection system for automotive lightweight injection molded parts, characterized by, The system comprises a rack (1): the right side of the top of the rack (1) is fixedly connected with a support seat (2), the left side of the top of the rack (1) is provided with a mold assembly (3), the top of the support seat (2) is provided with an injection assembly (4), the injection assembly (4) comprises a main sliding frame (41) which is slidably connected to the surface of the support seat (2), the left side of the main sliding frame (41) is fixedly connected with an injection cylinder (42), the inner cavity of the injection cylinder (42) is mounted with a rotatable injection screw rod (43), the left end of the injection screw rod (43) is fixedly connected with an injection head (44), the left side of the injection cylinder (42) is fixedly connected with a nozzle (45), the inner cavity of the main sliding frame (41) is slidably connected with a secondary sliding frame (46), the right side of the main sliding frame (41) is fixedly mounted with a main hydraulic cylinder (48), the output end of the main hydraulic cylinder (48) is fixedly connected with the secondary sliding frame (46), the surface of the nozzle (45) is provided with a material control assembly (5), the material control assembly (5) comprises a vertical sliding cavity (51) which is opened in the inner cavity of the top of the nozzle (45), the inner cavity of the vertical sliding cavity (51) is provided with a main valve ball (52) which is slidable, the front side and the rear side of the nozzle (45) are both mounted with a shunt channel (53), the two ends of the shunt channel (53) are respectively connected with the two sides of the inner cavity of the nozzle (45), the left end of the shunt channel (53) is fixedly connected with a pre-injection channel (54) which is connected with the inner cavity thereof, the inner cavity of the pre-injection channel (54) is provided with a pre-injection valve ball (55) which is slidable, the top of the inner cavity of the pre-injection channel (54) is integrally formed with a slanting sliding cavity (56) which is matched with the pre-injection valve ball (55).

2. The melt back injection system for lightweight injection molded parts of an automobile of claim 1, wherein, The mold assembly (3) comprises a fixed frame (31) which is fixedly connected to the left side of the top of the rack (1), the left side of the fixed frame (31) is provided with a hydraulic mold closing machine (32), the right side of the fixed frame (31) is fixedly mounted with a fixed mold (33), the inner cavity of the fixed frame (31) is slidably connected with a movable mold (34).

3. The melt back injection system for a lightweight injection molded automotive part of claim 2, wherein, The inner cavity of the secondary sliding frame (46) is fixedly mounted with a driving motor (47), the output shaft of the driving motor (47) is fixedly connected with the right end of the injection screw rod (43).

4. The melt back injection system for a lightweight injection molded automotive part of claim 3, wherein, The right end of the top of the front side and the rear side of the rack (1) is fixedly mounted with a secondary hydraulic cylinder (49), the output end of the secondary hydraulic cylinder (49) is fixedly connected with the main sliding frame (41).

5. The melt-back injection system for lightweight automotive injection molded parts of claim 4, wherein, The right side of the top of the injection cylinder (42) is fixedly connected with a raw material bin (9) which is connected with the inner cavity thereof.

6. The melt-back injection system for lightweight automotive injection molded parts of claim 5, wherein, The top of the nozzle (45) is threadedly connected with a shielding cover (58), the top of the shielding cover (58) is fixedly mounted with a laser ranging sensor (59).

7. The melt-back injection system for lightweight automotive injection molded parts of claim 6, wherein, The top of the nozzle (45) is embeddedly provided with a glass sheet (57), the surface of the shielding cover (58) is provided with a plurality of annularly distributed heat dissipation holes (8).

8. The melt-back injection system for lightweight automotive injection molded parts of claim 7, wherein, The surface of the injection cylinder (42) is fixedly mounted with a plurality of cylinder heating coils (6), the surface of the shunt channel (53) is fixedly mounted with a branch pipe heating coil (7).

9. The melt-back injection system for lightweight automotive injection molded parts of claim 8, wherein, The left side of the inner cavity of the vertical sliding cavity (51) is provided with an exhaust groove (10).

10. The melt back injection method of the automobile lightweight injection molded part, applied to the melt back injection system of the automobile lightweight injection molded part of claim 9, characterized in that, The method steps are as follows: Step one, first open the hydraulic mold clamping machine (32), the movable mold (34) is advanced, so that the movable mold (34) and fixed mold (33) can be closed, the injection material is introduced into the inner cavity of the material bin (9), the driving motor (47) is started, the driving motor (47) is started and drives the injection screw (43) to rotate in the inner cavity of the injection cylinder (42), so that the injection material in the inner cavity of the material bin (9) enters the inner cavity of the injection cylinder (42), at the same time, the cylinder heating ring (6) and the pipe heating ring (7) are started and heat is generated, at this time, the injection material in the inner cavity of the injection cylinder (42) is melted under the action of the shearing force of the injection screw (43) and the heat generated by the cylinder heating ring (6), and is transported to the left side of the inner cavity of the injection cylinder (42) under the action of the helical propulsion of the injection cylinder (42), waiting for injection; Step two, then the main hydraulic cylinder (48) is opened and the secondary slide (46) is advanced, so that the injection screw (43) slides to the left in the inner cavity of the injection cylinder (42), and the injection material in the inner cavity of the injection cylinder (42) is injected, at this time, the injection material enters the inner cavity of the nozzle (45), under the blocking action of the gravity of the main valve ball (52), the injection material first enters the inner cavity of the flow divider (53), the injection material in the inner cavity of the flow divider (53) generates resistance to the pre-injection valve ball (55), so that the pre-injection valve ball (55) slides obliquely in the inner cavity of the oblique sliding cavity (56), at this time, the inner cavity of the pre-injection channel (54) is unblocked, at this time, the injection material from the inner cavity of the flow divider (53) passes through the main valve ball (52) and reaches the left end of the nozzle (45) for injection, at this time, a small amount of injection material enters the injection channel of the fixed mold (33) and the movable mold (34), and the first injection is carried out on the edge of the channel, so as to promote the timely discharge of air in the inner cavity of the movable mold (34) and the fixed mold (33), complete pre-injection, so as to prevent the phenomenon of air burning and short shot; Step three, when the pre-injection is completed, the flow capacity of the flow divider (53) cannot meet the delivery requirement of the injection material, the injection pressure of the injection material in the inner cavity of the nozzle (45) increases, at this time, the injection pressure overcomes the gravity of the main valve ball (52), the main valve ball (52) rises upward and enters the top of the vertical sliding cavity (51), at this time, the inner cavity of the nozzle (45) is completely opened, so that a large amount of injection material is injected into the channel of the fixed mold (33) and the movable mold (34), and the injection is completed, at the same time, the laser ranging sensor (59) vertically downwardly generates ranging laser, the light transmits through the glass sheet (57) and irradiates on the surface of the main valve ball (52), so as to determine the opening size of the inner cavity of the nozzle (45) according to the ranging value of the main valve ball (52); Step four, after the injection is completed, the drive motor (47) is started again and drives the push injection screw (43) to rotate reversely in the inner cavity of the injection cylinder (42), at the same time, the main hydraulic cylinder (48) is started and pulls the secondary slide (46) to reset, so that the push injection screw (43) is reset, the storage space of the left side of the inner cavity of the injection cylinder (42) is reserved, in the process of the push injection screw (43) returning, the inner cavity of the injection cylinder (42) may be subjected to a negative pressure suction force from left to right, at the same time of the generation of the negative pressure suction force, under the joint action of the self-gravity of the main valve ball (52) and the pre-injection valve ball (55), the main valve ball (52) and the pre-injection valve ball (55) fall back, the inner cavity of the nozzle (45), i.e. the pre-injection channel (54) is blocked, thereby effectively preventing the phenomenon of material loss at the injection position of the injection part.

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