A sandwich injection molding device and method

Abstract

The present invention provides a sandwich injection molding device and method. The molding device includes a main shooting platform and a sub-shooting platform. The sub-nozzle of the sub-shooting platform can be moved away from or close to the main shooting platform under the drive of the sub-shooting movement mechanism, and the main nozzle of the main shooting platform can be moved away from or close to the molding mold under the drive of the main shooting movement mechanism. The sandwich injection molding method mainly connects the sub-nozzle with the main nozzle, squeezes the material A in the sub-nozzle into the main nozzle, and at the same time, the screw of the main shooting platform material tube of the main shooting platform is passively loosened. As the material A is squeezed in, the material B in the main nozzle retreats. Then the sub-shooting platform is removed, and the main shooting platform performs the injection action. Material A and material B are injected into the cavity of the molding mold in sequence; the outer surface of material A that enters the cavity first begins to solidify first, and material B that enters the cavity later flushes material A so that material A forms the outer layer of the molded part, and material B forms the inner layer of the molded part.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and in particular to sandwich injection molding equipment and method. Background Art

[0002] As the use of plastic products continues to increase worldwide, the requirements for these products in various application scenarios are also becoming increasingly stringent. Injection molding has also evolved from single-color, single-material molding to multi-color, multi-material molding. Commonly used single-shot injection molding machines are no longer able to meet these requirements. Therefore, injection molding preparation processes and related equipment must also evolve in parallel to adapt to market demands. Summary of the Invention

[0003] The present invention aims to provide a sandwich injection molding device and method, which can form an injection molded part with a sandwich structure of two or more materials at one time.

[0004] The technical solution of the present invention is achieved as follows:

[0005] A sandwich injection molding device: comprising a molding die having a cavity and a gate communicating with the cavity;

[0006] A main shooting platform, comprising a main shooting platform material pipe, a main shooting movement mechanism for driving the main shooting platform material pipe toward or away from the forming mold, a main nozzle provided at the front end of the main shooting platform material pipe, the main nozzle being used to dock with the gate, and a main flow channel communicating with the main nozzle being provided in the main shooting platform material pipe;

[0007] At least one auxiliary shooting platform, which has an auxiliary shooting platform material tube, an auxiliary shooting movement mechanism for driving the auxiliary shooting platform material tube to move closer to or away from the main shooting platform, and an auxiliary nozzle arranged at the front end of the auxiliary shooting platform material tube, the auxiliary nozzle is used to dock with the main nozzle and inject the material in the auxiliary shooting platform material tube into the main channel.

[0008] The sandwich injection molding equipment of the present invention is provided with a main shooting platform and a sub-shooting platform, and by docking the main nozzle and the sub-nozzle, the materials of the sub-shooting platform material tube and the main shooting platform material tube are pre-arranged in the main channel, the outer surface of the material that enters the mold cavity first begins to solidify first, and the material that enters the mold cavity later will flush the material that enters the mold cavity first, so that the material that enters the mold cavity first forms the outer layer of the molded part, and the material that enters the mold cavity later forms the inner layer of the molded part, thereby realizing the one-time molding of the sandwich injection molded part. The main shooting movement mechanism and the sub-shooting movement mechanism drive the movement of the main shooting platform material tube and the sub-shooting platform material tube so that the main nozzle can dock with the sub-nozzle and the gate of the molding mold, thereby enabling the injection molding equipment of the present invention to not only mold sandwich injection molded parts, but also mold single-material injection molded parts when the sub-shooting platform is not working.

[0009] Furthermore, the auxiliary shooting platform material pipe is arranged perpendicular to the main shooting platform material pipe.

[0010] Furthermore, the side surface of the auxiliary nozzle is provided with a glue outlet groove, and when the main nozzle and the auxiliary nozzle are docked, the main nozzle is inserted into the glue outlet groove.

[0011] Furthermore, a secondary flow channel is provided in the secondary shooting platform material pipe, and a connecting flow channel is also provided in the secondary shooting platform material pipe. One end of the connecting flow channel is connected to the end of the secondary flow channel, and the other end thereof is connected to the secondary nozzle.

[0012] Furthermore, the sandwich injection molding equipment further includes a transverse movement mechanism, and the auxiliary injection platform is connected to the transverse movement mechanism.

[0013] The transverse movement mechanism is used to drive the auxiliary shooting platform to move back and forth along the length direction of the main shooting platform material tube.

[0014] Preferably, the sandwich injection molding equipment further comprises a horizontally arranged turntable, the auxiliary shooting platform is connected to the turntable, and the turntable is used to drive the auxiliary shooting platform to rotate.

[0015] Furthermore, the auxiliary nozzle is detachably connected to the auxiliary injection platform material pipe, and the molding die also has an auxiliary gate;

[0016] The turntable drives the auxiliary shooting platform to rotate between a first position and a second position;

[0017] When the auxiliary shooting platform is located at the first position, the auxiliary shooting platform material pipe is located between the forming mold and the main shooting platform;

[0018] When the auxiliary injection platform is located at the second position, the auxiliary injection nozzle faces the auxiliary gate.

[0019] The present invention also provides a sandwich injection molding method, which uses the above-mentioned sandwich injection molding equipment and includes the following steps:

[0020] S1: Material A enters the secondary shooting station's material tube and is melted, while material B enters the primary shooting station's material tube and is melted;

[0021] S2: The secondary injection station performs the injection action, and the molten material A enters the front end of the main nozzle of the primary injection station. At the same time, the screw in the material tube of the primary injection station is passively loosened, and the molten material B moves away from the molding die;

[0022] S3: The secondary launch platform is far away from the main launch platform;

[0023] S4: The main injection station approaches the molding die and performs the injection action. Material A and material B are injected into the mold cavity in sequence. Material B pushes away material A to form a sandwich molded part.

[0024] Furthermore, step S1 also includes the injection molding equipment confirming the position of the auxiliary shooting platform. If the auxiliary shooting platform is located at the preset first position, step S2 is executed; if the auxiliary shooting platform is located at the preset second position, step S11 is executed: the main shooting platform injects the molten material B into the cavity of the molding mold, and the auxiliary shooting platform injects the molten material A into the cavity of the molding mold.

[0025] Furthermore, before step S2, the method further includes step S20: the auxiliary shooting platform approaches the main shooting platform in a direction perpendicular to the material pipe of the main shooting platform, so that the main shooting nozzle of the main shooting platform is connected with the auxiliary shooting nozzle of the auxiliary shooting platform; the main shooting platform approaches the auxiliary shooting platform so that the auxiliary shooting nozzle and the main shooting nozzle are tightly connected;

[0026] After step S2 , the method further includes step S21 : the main shooting platform moves away from the auxiliary shooting platform, and the main shooting nozzle and the auxiliary shooting nozzle are separated to prevent the main shooting nozzle from interfering with the auxiliary shooting nozzle when the auxiliary shooting platform moves.

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] 1. By providing a primary and secondary injection platform, and by docking the primary and secondary nozzles, materials from the secondary and primary injection platform pipes are pre-arranged within the main nozzle's main flow channel before being sequentially injected into the mold cavity to form a single-piece sandwich injection molded part. The sandwich injection molding equipment and method of the present invention achieves sandwich injection molding without requiring modifications to the mold and primary injection platform structures.

[0029] 2. The side of the auxiliary nozzle is provided with a glue outlet groove, so that the main nozzle can be docked with the auxiliary nozzle and the gate of the molding mold, thereby enabling the injection molding equipment of the present invention to not only form sandwich injection molded parts, but also form single-material injection molded parts when the auxiliary injection station is not working.

[0030] 3. By setting up a turntable and a detachable auxiliary nozzle, the auxiliary nozzle can not only inject materials into the main nozzle, but also directly inject materials into the cavity through the auxiliary gate of the molding mold after changing the type of the auxiliary nozzle, thereby realizing multiple injection molding processes such as multi-color injection molding and sandwich injection molding on the same equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 2 is a front view of a sandwich injection molding apparatus according to embodiment 1 of the present invention;

[0033] Figure 2 It is a partial cross-sectional view of the main shooting platform material tube and the auxiliary shooting platform material tube of the present invention;

[0034] Figure 3 yes Figure 2 Enlarged view of point C in the middle;

[0035] Figure 4 Schematic diagram of the movement of the cavity of the sandwich injection molding device of the present invention;

[0036] Figure 5 2 is a front view of a sandwich injection molding apparatus according to embodiment 2 of the present invention;

[0037] Figure 6 1 is a flow chart of the steps of the sandwich injection molding method of Example 3 of the present invention.

[0038] Among them, 1. Molding mold, 2. Main shooting platform, 3. Auxiliary shooting platform, 4. Transverse movement mechanism, 5. Turntable, 11. Cavity, 12. Gate, 13. Auxiliary gate, 21. Main shooting platform material pipe, 22. Main shooting movement mechanism, 23. Main nozzle, 24. Main channel, 25. Main heater, 31. Auxiliary shooting platform material pipe, 32. Auxiliary shooting movement mechanism, 33. Auxiliary nozzle, 34. Auxiliary runner, 35. Connecting runner, 36. Auxiliary heater, 331. Glue discharge groove. DETAILED DESCRIPTION

[0039] The following combination Figures 1 to 6 The technical solution provided by the present invention is described in more detail.

[0040] Example 1

[0041] like Figures 1 to 3 As shown, the sandwich injection molding equipment of the present invention includes: a molding mold 1, which has a mold cavity 11 and a gate 12 connected to the mold cavity 11; a main shooting platform 2, which has a main shooting platform material pipe 21, a main shooting movement mechanism 22 for driving the main shooting platform material pipe 21 close to or away from the molding mold 1, and a main nozzle 23 arranged at the front end of the main shooting platform material pipe 21, the main nozzle 23 is used to dock with the gate 12, and a main flow channel 24 connected to the main nozzle 23 is arranged in the main shooting platform material pipe 21; at least one auxiliary shooting platform 3, which has an auxiliary shooting platform material pipe 31, a secondary shooting movement mechanism 32 for driving the auxiliary shooting platform material pipe 31 close to or away from the main shooting platform 2, and an auxiliary nozzle 33 arranged at the front end of the auxiliary shooting platform material pipe 31, the auxiliary nozzle 33 is used to dock with the main nozzle 23 and inject the material in the auxiliary shooting platform material pipe 21 into the main flow channel 24.

[0042] The main injection molding platform 2 and auxiliary injection molding platform 3 can be hydraulic injection molding platforms, electric injection molding platforms, or hybrid injection molding platforms. The present invention does not limit the injection drive method of the main injection molding platform 2 and auxiliary injection molding platform 3. The auxiliary injection molding platform 3 and the main injection molding platform 2 can be controlled uniformly by an integrated circuit, or separate control modules can be provided to independently control the auxiliary injection molding platform 3.

[0043] By setting up the main shooting platform 2 and the auxiliary shooting platform 3, and by docking the main nozzle 23 and the auxiliary shooting nozzle 33, it is achieved that the materials of the auxiliary shooting platform material tube 31 and the main shooting platform material tube 21 are pre-arranged in the main flow channel 24 of the main shooting nozzle 23, and then injected into the mold cavity 11 in sequence. Figure 4 As shown, the outer surface of material A, which enters cavity 11 first, begins to solidify first. Material B, which enters cavity 11 later, then pushes away the material that entered cavity 11 first, leaving material A forming the outer layer of the molded part and material B forming the inner layer of the molded part, thus achieving a one-step formation of a sandwich injection molded part. The sandwich injection molding apparatus and method of the present invention can achieve sandwich injection molding without requiring modifications to the mold and main shooting platform structure.

[0044] It should be noted that the sandwich injection molding equipment of the present invention includes one or more auxiliary shooting platforms 3. The auxiliary nozzles 33 of different auxiliary shooting platforms 3 are connected with the main nozzle 23 in sequence under the drive of their corresponding auxiliary shooting movement mechanisms 32, so that different materials are pre-sorted in the main channel 24 and then injected into the mold cavity 11 in sequence to form multi-layer sandwich injection molded parts.

[0045] In this embodiment, if Figure 2 As shown, the auxiliary shooting platform material pipe 31 is arranged perpendicular to the main shooting platform material pipe 21; Figure 3 As shown, the side of the secondary nozzle 33 has a glue outlet groove. When the main nozzle 23 and the secondary nozzle 33 are connected, the main nozzle 33 is inserted into the glue outlet groove 331. If multiple secondary injection platforms 3 are used, they can be distributed circumferentially along the axis of the main injection platform material tube 21. Each secondary injection platform 3 is driven by a secondary injection movement mechanism 32 to move the secondary nozzle 33 toward or away from the main nozzle 23. For ease of understanding, the figures of this embodiment only show a schematic diagram of one secondary injection platform 3.

[0046] The side of the auxiliary nozzle 33 has a glue outlet groove 331, so that the main nozzle 23 can be connected to the auxiliary nozzle 33 and the gate 12 of the molding mold 1, thereby enabling the injection molding equipment of the present invention to not only form sandwich injection molded parts, but also form single-material injection molded parts when the auxiliary injection platform 3 is not working.

[0047] like Figure 3 As shown, a secondary flow channel 34 is provided in the secondary shooting platform material pipe 31. Since in this embodiment, the secondary shooting platform material pipe 31 is arranged perpendicular to the main shooting platform material pipe 21, in order to connect the main channel 24 with the secondary flow channel 34, the secondary shooting platform material pipe 31 also has a connecting flow channel 35. One end of the connecting flow channel 35 is connected to the end of the secondary flow channel 34, and the other end thereof is connected to the secondary nozzle 33.

[0048] To facilitate adjustment of the lateral position of the secondary shooting platform 3, the sandwich injection molding apparatus further includes a transverse movement mechanism 4. The secondary shooting platform 3 is connected to the transverse movement mechanism 4 and is configured to drive the secondary shooting platform 3 to move back and forth along the length of the primary shooting platform material tube 21. The transverse movement mechanism 4 may be a hydraulic drive, an electric drive, or a handwheel drive. The accompanying drawings only provide a schematic diagram of a handwheel drive; the present invention does not limit the structure of the transverse movement mechanism 4.

[0049] The sandwich injection molding apparatus further includes a main heater 25 and a secondary heater 36. The main heater 25 is disposed around the outside of the primary-shooting-stage material tube 21, and the secondary heater 36 is disposed around the outside of the secondary-shooting-stage material tube 31. The main heater 25 is used to heat the primary-shooting-stage material tube 21 to melt material B therein, while the secondary heater 36 is used to heat the secondary-shooting-stage material tube 31 to melt material A therein.

[0050] Example 2

[0051] The technical solutions of this embodiment are basically the same as those of Example 1, with the main difference being that the sandwich injection molding equipment further includes a horizontally arranged turntable 5, the auxiliary shooting platform 3 is connected to the turntable 5, and the turntable 5 is used to drive the auxiliary shooting platform 3 to rotate. When the auxiliary shooting platform 3 is not in use, the turntable 5 can be rotated to other directions to avoid the auxiliary shooting platform 3 interfering with the cooperation between the main shooting platform 2 and the molding mold 1.

[0052] As a preferred solution, the auxiliary nozzle 33 is detachably connected to the auxiliary shooting platform material tube 31, and the molding die 1 also has an auxiliary gate 13; when the auxiliary shooting platform 3 is in the first position, the auxiliary shooting platform material tube 31 is located between the molding die and the main shooting platform 2; when the auxiliary shooting platform 3 is in the second position, the auxiliary nozzle 33 is directly opposite to the auxiliary gate 13. The turntable 5 can be set above the molding die 1, and the auxiliary gate 13 needs to be set at the top of the molding die 1. In addition, the turntable 5 can also be set on the side of the molding die 1, and the auxiliary gate 13 should be set on the side of the molding die 1 accordingly. Figure 1 As shown, the auxiliary launch platform 3 is located at the first position; Figure 5 As shown, the secondary injection platform 3 is located at the second position.

[0053] Because the auxiliary nozzle 33 is detachable from the auxiliary injection platform material pipe, different types of nozzles can be used when the auxiliary injection platform 3 is in the first and second positions, respectively docking with the injection nozzle 23 and the auxiliary gate 13. When the auxiliary injection platform is in the first position, the auxiliary nozzle 33 has a dispensing groove; when the auxiliary injection platform is in the second position, the auxiliary nozzle is replaced with a standard protruding nozzle, allowing the auxiliary nozzle to dock with the auxiliary gate.

[0054] Therefore, the auxiliary nozzle 33 can not only inject materials into the main nozzle 23, but also can directly inject materials into the cavity 11 of the molding mold 1 through the auxiliary gate 13 of the molding mold 1 after the auxiliary nozzle is replaced with a standard nozzle, thereby realizing multiple injection molding processes such as multi-color injection molding and sandwich injection molding on the same equipment.

[0055] Example 3

[0056] like Figure 6 As shown, this embodiment provides a sandwich injection molding method, which is applicable to the sandwich injection molding device of Example 1 or Example 2, and includes the following steps:

[0057] S1: Material A enters the secondary shooting station's material tube and is melted, while material B enters the primary shooting station's material tube and is melted;

[0058] S2: The secondary injection station performs the injection action, and the molten material A enters the front end of the main nozzle of the primary injection station. At the same time, the screw in the material tube of the primary injection station is passively loosened, and the molten material B moves away from the molding die;

[0059] S3: The secondary launch platform is far away from the main launch platform;

[0060] S4: The main injection station approaches the molding die and performs the injection action. Material A and material B are injected into the mold cavity in sequence. Material B pushes away material A to form a sandwich molded part.

[0061] By using the sandwich injection molding method of the present invention, the outer surface of material A that enters the cavity first begins to solidify, and material B that enters the cavity later flushes material A so that material A forms the outer layer of the molded part and material B forms the inner layer of the molded part.

[0062] It should be noted that by presetting the amount of material B injected from the auxiliary nozzle into the main nozzle, molded parts with different interlayer effects can be obtained to meet the different requirements of various products.

[0063] Preferably, before step S2, the method further includes step S20: the auxiliary shooting platform approaches the main shooting platform in a direction perpendicular to the material pipe of the main shooting platform, so that the main shooting nozzle of the main shooting platform is connected with the auxiliary shooting nozzle of the auxiliary shooting platform; the main shooting platform approaches the auxiliary shooting platform so that the auxiliary shooting nozzle and the main shooting nozzle are tightly connected;

[0064] After step S2 , the method further includes step S21 : the main shooting platform moves away from the auxiliary shooting platform, and the main shooting nozzle and the auxiliary shooting nozzle are separated to prevent the main shooting nozzle from interfering with the auxiliary shooting nozzle when the auxiliary shooting platform moves.

[0065] For the injection molding equipment with a turntable 5, step S1 also includes the injection molding equipment confirming the position of the auxiliary shooting platform. If the auxiliary shooting platform is located at the preset first position, step S2 is executed; if the auxiliary shooting platform is located at the preset second position, step S11 is executed: the main shooting platform injects the molten material B into the cavity of the molding mold, and the auxiliary shooting platform injects the molten material A into the cavity of the molding mold.

[0066] It should be noted that the position of the auxiliary shooting platform can be detected in real time using an infrared sensor or other device. The infrared sensor can be electrically connected to the control module of the injection molding equipment, and the injection molding equipment can send a work instruction to the auxiliary shooting platform based on the detection results of the infrared sensor. Other detection devices commonly used by those skilled in the art can also be used to detect the specific position of the auxiliary shooting platform, or a travel recording device can be used to record the angle of the turntable to obtain the specific position of the auxiliary shooting platform. The present invention does not limit the specific technical means for detecting the real-time position of the auxiliary shooting platform.

[0067] According to actual needs, the material A and the material B are materials of different colors, or materials of different materials, or materials of different colors and materials.

[0068] In the description of the present invention, it should be understood that the terms "vertical", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0069] If words such as "first" and "second" are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the words have no special meaning.

[0070] The present invention is not limited to the described embodiments. If various changes or modifications of the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims of the present invention and equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A sandwich injection molding device, characterized in that, include: A molding die having a cavity and a gate communicating with the cavity; A main shooting platform, comprising a main shooting platform material pipe, a main shooting movement mechanism for driving the main shooting platform material pipe toward or away from the forming mold, a main nozzle provided at the front end of the main shooting platform material pipe, the main nozzle being used to dock with the gate, and a main flow channel communicating with the main nozzle being provided in the main shooting platform material pipe; At least one auxiliary shooting station, which has an auxiliary shooting station material pipe, a secondary shooting movement mechanism for driving the auxiliary shooting station material pipe toward or away from the main shooting station, and an auxiliary nozzle provided at the front end of the auxiliary shooting station material pipe, the auxiliary nozzle being used to dock with the main nozzle and inject the material in the auxiliary shooting station material pipe into the main channel; The sandwich injection molding equipment further includes a horizontally arranged turntable, the auxiliary shooting table is connected to the turntable, the turntable is used to drive the auxiliary shooting table to rotate; The auxiliary nozzle is detachably connected to the auxiliary injection platform material pipe, and the molding die also has an auxiliary gate; The turntable drives the auxiliary shooting platform to rotate between a first position and a second position; When the auxiliary shooting platform is located at the first position, the auxiliary shooting platform material pipe is located between the forming mold and the main shooting platform; When the auxiliary injection platform is located at the second position, the auxiliary injection nozzle faces the auxiliary gate.

2. The sandwich injection molding equipment according to claim 1, characterized in that: The auxiliary shooting platform material pipe is arranged perpendicular to the main shooting platform material pipe.

3. The sandwich injection molding equipment according to claim 2, characterized in that: The side surface of the auxiliary nozzle is provided with a glue outlet groove. When the main nozzle and the auxiliary nozzle are connected, the main nozzle is inserted into the glue outlet groove.

4. The sandwich injection molding equipment according to claim 2, characterized in that: A secondary flow channel is provided in the secondary injection platform material pipe, and a connecting flow channel is also provided in the secondary injection platform material pipe. One end of the connecting flow channel is communicated with the end of the secondary flow channel, and the other end thereof is communicated with the secondary injection nozzle.

5. The sandwich injection molding equipment according to claim 2, characterized in that: The sandwich injection molding equipment further includes a transverse movement mechanism, and the auxiliary injection platform is connected to the transverse movement mechanism. The transverse movement mechanism is used to drive the auxiliary shooting platform to move back and forth along the length direction of the main shooting platform material tube.

6. A sandwich injection molding method, applied to the injection molding equipment according to any one of claims 1 to 5, wherein the injection molding equipment has a main injection station and a secondary injection station, characterized in that: The molding method comprises the following steps: S1: Material A enters the secondary shooting station's material tube and is melted, while material B enters the primary shooting station's material tube and is melted; S2: The secondary injection station performs the injection action, and the molten material A enters the front end of the main nozzle of the primary injection station. At the same time, the screw in the material tube of the primary injection station is passively loosened, and the molten material B moves away from the molding die; S3: The secondary launch platform is far away from the main launch platform; S4: The main injection station approaches the molding die and performs the injection action. Material A and material B are injected into the mold cavity in sequence. Material B pushes away material A to form a sandwich molded part.

7. The sandwich injection molding method according to claim 6, characterized in that: Step S1 also includes the injection molding equipment confirming the position of the auxiliary shooting platform. If the auxiliary shooting platform is located at the preset first position, step S2 is executed; if the auxiliary shooting platform is located at the preset second position, step S11 is executed: the main shooting platform injects the molten material B into the cavity of the molding mold, and the auxiliary shooting platform injects the molten material A into the cavity of the molding mold.

8. The sandwich injection molding method according to claim 6, characterized in that: Before step S2, the method further includes step S20: the auxiliary shooting platform approaches the main shooting platform in a direction perpendicular to the material pipe of the main shooting platform, so that the main shooting nozzle of the main shooting platform is connected with the auxiliary shooting nozzle of the auxiliary shooting platform; The main shooting platform is close to the auxiliary shooting platform, so that the auxiliary nozzle and the main nozzle are closely connected; After step S2 , the method further includes step S21 : the main shooting platform moves away from the auxiliary shooting platform, and the main shooting nozzle and the auxiliary shooting nozzle are separated to prevent the main shooting nozzle from interfering with the auxiliary shooting nozzle when the auxiliary shooting platform moves.

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