Auxiliary jig for lens protection cover injection molding demolding

Abstract

The utility model relates to auxiliary clamp for lens protection cover injection molding demoulding belongs to injection molding auxiliary equipment technical field. Mainly include base, negative pressure distribution cavity, flexible adsorption panel, micro support arm array and drive mechanism. The base front end is equipped with the installation cavity, and the negative pressure distribution cavity is fixed in the installation cavity, and its front end is equipped with the opening, the flexible adsorption panel covers in the front end opening at the negative pressure distribution cavity, and it is equipped with a plurality of micropore that penetrates the panel thickness on it, and the inside of negative pressure distribution cavity is equipped with a plurality of independent airflow channel, and each airflow channel is linked with the micropore of corresponding area on the flexible adsorption panel respectively, the micro support arm array is composed of several precision jacks, and each precision jack is connected with the drive mechanism inside the base. The utility model solves the technical problem that the existing demoulding clamp cannot effectively prevent the plastic deformation of deep cavity thin wall lens protection cover in the demoulding process due to the lack of internal support in structure, and simultaneously avoids the technical problem that the clamping indentation is generated on the outer surface.

Description

Technical Field

[0001] This utility model belongs to the technical field of injection molding auxiliary equipment, specifically relating to an auxiliary fixture for demolding lens cover injection molding. Background Technology

[0002] Lens caps, as crucial protective components for optical equipment, are directly affected by the injection molding quality of their appearance and performance. These products typically feature deep cavities and thin walls, and their outer surfaces must meet stringent requirements for a high-gloss, flawless finish. In the demolding process, current technologies commonly employ vacuum chucks or mechanical grippers as the removal fixtures.

[0003] However, vacuum suction cups have insufficient suction force when dealing with deep cavity structures and are prone to collapse in thin-walled areas; mechanical grippers, on the other hand, need to directly clamp the outer surface of the product, making it difficult to avoid leaving clamping marks on the product. Furthermore, lens caps injection molded from nylon shrink tightly onto the mold core during the cooling phase due to contraction. If there is a lack of effective internal support during demolding, the product is highly susceptible to plastic deformation. While current vacuum suction clamps can achieve non-contact gripping to avoid surface damage, their structure lacks an internal support mechanism for the product, failing to overcome demolding deformation problems. While mold-integrated ejector systems can provide demolding assistance, they require ejection positions to be designed on the product, which is unsuitable for lens caps that lack internal holes. Therefore, existing demolding clamps have significant structural limitations, necessitating a simple demolding clamp that combines external suction and internal support functions without requiring modification to existing molds. Utility Model Content

[0004] In order to overcome the problems in the background art, this utility model provides an auxiliary jig for demolding lens protective covers during injection molding, so as to solve the technical problem that the existing demolding jigs cannot effectively prevent the plastic deformation of deep cavity thin-walled lens protective covers during demolding due to the lack of internal support mechanism, and at the same time avoid the formation of clamping indentations on the outer surface.

[0005] To solve the above problems, this utility model adopts the following technical solution: an auxiliary fixture for demolding lens protective cap injection molding, comprising a base, a negative pressure distribution cavity, a flexible adsorption panel, a micro support arm array, and a driving mechanism. The base has a mounting cavity at its front end, and the negative pressure distribution cavity is fixed within the mounting cavity, with an opening at its front end. The flexible adsorption panel covers the front opening of the negative pressure distribution cavity. This panel is made of elastic silicone material and has multiple micropores penetrating the panel thickness. The negative pressure distribution cavity has multiple independent airflow channels, each connected to a corresponding micropore on the flexible adsorption panel to ensure uniform negative pressure distribution. A conical silicone sealing plug is embedded at the outlet end of each airflow channel. The micro support arm array consists of several precision push rods. Each precision push rod is fitted with a low-friction coefficient plastic sleeve and then embedded in the silicone matrix of the flexible adsorption panel. The silicone matrix of the flexible adsorption panel has an array of mounting holes that are interference-fitted with the sleeve, allowing the push rods to slide axially while maintaining airtightness. The precision push rods are arranged in a ring array within the silicone matrix of the flexible adsorption panel and are located in the gaps between the micropores. The drive mechanism is located inside the base and connected to an external control system via a signal line. This drive mechanism is connected to the rear end of each precision push rod and is used to drive each precision push rod to extend or retract along its axial direction. The side wall of the negative pressure distribution chamber is provided with a negative pressure interface, which is connected to an external vacuum generator via a hose to provide a stable negative pressure environment to the negative pressure distribution chamber. The rear end of the base is provided with a standard mechanical interface for connecting to an external robotic arm or fixed bracket. The standard mechanical interface is a flange structure or a quick-connect coupling structure.

[0006] Furthermore, the micropores are uniformly arrayed on the flexible adsorption panel, the pore size of the micropores is 0.3 mm to 0.8 mm, and the center distance between adjacent micropores is 1.0 mm to 2.0 mm.

[0007] Furthermore, the precision push rod is made of stainless steel or ceramic material, with a diameter of 0.3 mm to 0.8 mm, and the precision push rod is machined into a spherical shape or an arc shape.

[0008] Furthermore, the driving mechanism is a micro linear actuator, specifically a piezoelectric ceramic actuator or a micro electromagnetic push rod.

[0009] Furthermore, the flexible adsorption panel is provided with an annular sealing flange around its periphery, which is interference-fitted with the front opening edge of the negative pressure distribution cavity to form an airtight connection.

[0010] Furthermore, a guide sleeve is provided on the fixing plate inside the base, and each precision push rod passes through the guide sleeve. The inner wall of the guide sleeve and the outer surface of the precision push rod are in clearance fit to ensure the straightness of the axial movement of the precision push rod.

[0011] Furthermore, the drive mechanism includes a common drive plate, which is simultaneously connected to the rear ends of all precision push rods to achieve synchronous extension or retraction of all precision push rods.

[0012] Furthermore, a return spring is provided between the common drive plate and the fixed plate of the base. The return spring is axially sleeved on the precision push rod, with one end abutting against the fixed plate of the base 1 and the other end abutting against the bottom of the common drive plate. When the drive mechanism is de-energized or loses driving force, the return spring pushes the common drive plate to move backward, causing all precision push rods to automatically retract to their initial positions.

[0013] Furthermore, the base is made of aluminum alloy material through precision machining, and its shape is a cylindrical or cuboid structure. The mounting cavity is a stepped hole structure, which is used to position and fix the negative pressure distribution cavity.

[0014] Furthermore, the flexible adsorption panel has a thickness of 3 mm to 5 mm and a surface hardness of Shore A 40 to 60 degrees to ensure that it has sufficient flexibility without losing support when in contact with the edge of the lens cover.

[0015] The beneficial effects of this utility model; This invention integrates a flexible adsorption panel and a micro-support arm array at the front end of a single fixture. The micro-pore array on the flexible adsorption panel generates a uniform negative pressure adsorption force to grip the outer edge of the product. Simultaneously, a drive mechanism controls the axial extension of a precision push rod embedded within the flexible adsorption panel, providing direct physical support to the inner cavity of the lens cover. This structure, combining external adsorption and internal support, effectively avoids the collapse problem in thin-walled areas caused by simple vacuum adsorption and eliminates the risk of indentations on the outer surface caused by mechanical grippers. The fixture has a compact overall structure and can be directly applied without any modification to existing injection molds, significantly improving the yield and quality stability of deep-cavity thin-walled lens cover demolding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a three-dimensional schematic diagram of the working state of this utility model.

[0018] Figure 3 This is a three-dimensional sectional view of the internal structure of this utility model.

[0019] Figure 4 This is a three-dimensional schematic diagram showing the connection between the drive mechanism and the precision push rod.

[0020] Figure 5 This is an exploded structural diagram of the present invention.

[0021] Figure 6 A schematic diagram of the cross-sectional structure of the airflow channel inside the negative pressure distribution chamber.

[0022] Explanation of reference numerals in the attached figures: 1. Base; 2. Negative pressure distribution chamber; 3. Flexible adsorption panel; 4. Micro support arm array; 5. Drive mechanism; 6. Mounting cavity; 7. Micropore; 8. Precision push rod; 9. Airflow channel; 10. Standard mechanical interface; 11. Annular sealing flange; 12. Negative pressure interface; 13. Guide sleeve; 14. Common drive plate; 15. Return spring; 16. Fixing plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0024] This utility model provides an auxiliary clamp for demolding lens protective caps during injection molding. Please refer to [link / reference]. Figures 1 to 6 As shown, the auxiliary clamp mainly includes a stable base 1, a negative pressure distribution chamber 2 responsible for negative pressure transmission, a flexible adsorption panel 3 for direct contact and adsorption of the lens protective cover, a micro support arm array 4 providing internal support, and a drive mechanism 5 for controlling the extension and retraction of the rigid support arms.

[0025] Specifically, the base 1, as the main structural component of the entire auxiliary fixture, is made of high-strength, lightweight aluminum alloy through precision machining. Its shape can be a regular cylinder or cuboid to adapt to different installation environments and space constraints. The front end of the base 1 is machined along its central axis to form a recessed mounting cavity 6. The mounting cavity 6 has a stepped hole structure, containing multiple concentric cylindrical segments of different diameters, with stepped transition surfaces between each segment. This stepped hole structure is used for precise radial positioning and axial limiting of the negative pressure distribution cavity 2, ensuring its stable installation within the base 1. At the rear end of the base 1, opposite to its front mounting cavity 6, is a standard mechanical interface 10. This standard mechanical interface 10 is a universal flange structure or a quick-connect coupling structure, designed for mechanical connection with external automated equipment such as the end effector of an industrial robotic arm or a fixed tooling bracket, enabling rapid installation, disassembly, and precise positioning of the auxiliary fixture. Inside the base 1, along the movement path of the drive mechanism 5, several guide sleeves 13 are precisely provided. These guide sleeves 13 are typically made of wear-resistant engineering plastic or copper alloy, and are elongated cylindrical tubular structures fixed to a fixing plate 16 inside the base 1. A small gap fit is formed between the inner wall of each guide sleeve 13 and the outer surface of the precision push rod 8 in the micro support arm array 4. This gap fit ensures that the precision push rod 8 moves smoothly only along its central axis during axial movement, thereby achieving precise constraint on the axial movement trajectory of the precision push rod 8, effectively ensuring the straightness of its axial movement, and preventing movement difficulties or positioning errors caused by radial sway.

[0026] The negative pressure distribution chamber 2 is a shell with a specific internal flow channel structure, and its material can be rigid engineering plastic or lightweight metal. The negative pressure distribution chamber 2 is precisely fixed inside the mounting cavity 6 of the base 1, and its shape matches the stepped hole structure of the mounting cavity 6. It is securely installed by means of bolt connection, snap-fit, or adhesive. The front end of the negative pressure distribution chamber 2 faces the outside of the clamp and has an opening structure. This opening is usually circular or a non-circular structure that conforms to the edge shape of the lens protective cover. The negative pressure distribution chamber 2 has multiple independent airflow channels 9 arranged radially or in a grid pattern inside. Each airflow channel 9 branches from the negative pressure interface 12 of the negative pressure distribution chamber 2 and extends to the area corresponding to the front opening of the negative pressure distribution chamber 2, directly connecting with the micropores 7 arranged on the flexible adsorption panel 3. A conical silicone sealing plug is embedded at the outlet end of each airflow channel 9. After being deformed by pressure, the sealing plug fits tightly against the back of the flexible adsorption panel 3, ensuring a dynamic airtight connection between the micropores 7 and the channel 9. This multi-channel separation structure allows the negative pressure introduced from the external vacuum generator to be uniformly and efficiently transmitted to each micropore 7 of the flexible adsorption panel 3 through each independent airflow channel 9, maintaining a uniform distribution of negative pressure adsorption force on the surface of the flexible adsorption panel 3 and avoiding adsorption instability or local deformation caused by uneven negative pressure. A negative pressure interface 12 is provided on the outer side wall of the negative pressure distribution chamber 2. The negative pressure interface 12 is usually a tubular structure with a standard pneumatic connector. It is reliably connected to an external vacuum generator (not shown) through a flexible hose to continuously provide a stable negative pressure environment to the inside of the negative pressure distribution chamber 2, thereby driving the flexible adsorption panel 3 to achieve the vacuum adsorption function.

[0027] The flexible adsorption panel 3 is a key component that directly contacts the lens cover. It is a thin plate or a membrane-like structure with a certain curvature, precisely covering and installed at the front opening of the negative pressure distribution chamber 2. The flexible adsorption panel 3 is integrally injection molded or compression molded from silicone material with excellent elasticity and wear resistance. Its surface hardness is controlled within the Shore A range of 40 to 60 degrees to ensure sufficient flexibility to adapt to microscopic unevenness of the product surface when in contact with the edge of the lens cover, while maintaining sufficient support to preserve its structural integrity. The thickness of the flexible adsorption panel 3 is typically 3 to 5 millimeters to provide the necessary strength and flexibility. Multiple micropores 7 penetrating the thickness of the panel are evenly distributed across the entire working surface of the flexible adsorption panel 3. The pore size of the micropores 7 is 0.3 to 0.8 millimeters, and the center-to-center distance between adjacent micropores 7 is 1.0 to 2.0 millimeters. This size and distribution ensure sufficient adsorption force while avoiding any visible indentations or damage to the outer surface of the lens cover. The flexible adsorption panel 3 is also integrally formed with an annular sealing flange 11 at its peripheral edge. The outer diameter of the annular sealing flange 11 is slightly larger than the inner diameter of the front opening of the negative pressure distribution cavity 2, so that the annular sealing flange 11 and the edge of the front opening of the negative pressure distribution cavity 2 form an interference fit. This interference fit ensures a reliable airtight connection between the flexible adsorption panel 3 and the negative pressure distribution cavity 2, effectively preventing negative pressure leakage and ensuring the stability of the adsorption function.

[0028] The micro support arm array 4 consists of several independent precision push rods 8, typically ranging from 8 to 20, to accommodate lens caps of different sizes and shapes. Each precision push rod 8 is precision-machined from high-strength, high-hardness stainless steel or ceramic material, with a diameter of 0.3 mm to 0.8 mm, matching the aperture size of the micropores 7 on the flexible adsorption panel 3. The front end of each precision push rod 8 is specially processed to form a smooth spherical or arc-shaped surface. This shape reduces contact stress and effectively avoids scratches or indentations on the product when in contact with the inner surface of the lens cap. Each precision push rod 8 is fitted with a low-friction coefficient plastic sleeve and then embedded in the silicone matrix of the flexible adsorption panel 3. The silicone matrix of the flexible adsorption panel 3 has an array of mounting holes that are interference-fitted with the sleeve, allowing the push rod to slide axially while maintaining airtightness. The precision push rod 8 is precisely positioned in the gap area between the micropores 7 on the flexible adsorption panel 3, so that when the precision push rod 8 extends, its front end protrudes from the non-micropore area of ​​the flexible adsorption panel 3 and directly extends into the inner cavity of the lens cover to provide support without hindering the negative pressure adsorption effect. The precision push rods 8 are arranged in a ring array within the silicone matrix of the flexible adsorption panel 3. This layout ensures comprehensive and uniform support for the inner cavity of the lens cover. The rear end of the precision push rod 8 passes through the guide sleeve 13 inside the base 1 and is securely connected to the drive mechanism 5.

[0029] The drive mechanism 5 is disposed within the internal space of the base 1. Specifically, the drive mechanism 5 is a miniature linear actuator, which can be a high-precision piezoelectric ceramic actuator, utilizing the piezoelectric effect to achieve micron-level precise displacement, or a fast-response, compact miniature electromagnetic push rod, achieving linear reciprocating motion through electromagnetic force. The drive mechanism 5 is connected to the rear ends of all precision push rods 8 via its output end. The drive mechanism 5 generates linear thrust or pull force by precisely controlling electrical signals or voltage, thereby driving each precision push rod 8 to extend or retract along its axial direction. The drive mechanism 5 includes a common drive plate 14, which is typically a thin plate structure made of hard metal or high-strength engineering plastic. The bottom of the common drive plate 14 has multiple connecting holes or connecting seats, and the rear ends of all precision push rods 8 are simultaneously connected to the common drive plate 14 by mechanical fixing methods (such as threaded connections or pin fixation). This connection method ensures that when the drive mechanism 5 acts on the common drive plate 14, the common drive plate 14 moves synchronously as a whole, directly driving the rear ends of all connected precision push rods 8 to move axially in the same direction and at equal distances. This allows all precision push rods 8 to extend or retract synchronously, ensuring the consistency and stability of the support action. The fixing plate 16 is installed inside the base 1 by screws or clips. Between the common drive plate 14 and the fixing plate 16 of the base 1, several return springs 15 are symmetrically or evenly arranged. The return springs 15 are compression coil springs (with an elastic coefficient K of 0.5-1.0 N / mm and a pre-compression amount δ of 20%-30% of the total stroke, ensuring that the retraction force of the push rod 8 is ≥1.5 times the movement resistance when the power is off). They are axially sleeved on the precision push rods 8, with one end abutting against the fixing plate 16 of the base 1 and the other end abutting against the bottom of the common drive plate 14. When the drive mechanism 5 is energized or a driving force is applied, the driving force overcomes the elasticity of the return spring 15, pushing the common drive plate 14 and the precision ejector pins 8 forward. When the drive mechanism 5 is de-energized or loses driving force, the preload of the return spring 15 will push the common drive plate 14 backward, thereby causing all the precision ejector pins 8 to automatically retract to their initial positions, ensuring the safety and reset function of the fixture in the non-drive state. The drive mechanism 5 is electrically connected to an external control system via a multi-core signal line (not shown). The external control system is a programmable logic controller (PLC) or microprocessor control unit, responsible for coordinating the extension and retraction of the drive mechanism 5 with the start and stop timing of the negative pressure supply of the negative pressure distribution chamber 2, realizing automated and precise control of the lens protective cover demolding process. Through this external control system, the extension speed, displacement, and duration of negative pressure adsorption of the precision ejector pins 8 can be adjusted according to the characteristics and demolding requirements of different lens protective covers, thereby optimizing the demolding effect.

[0030] In summary, this invention integrates the flexible adsorption panel 3 and the micro support arm array 4 at the same front end of the clamp, achieving a synergistic effect of external negative pressure adsorption and internal physical support. During the demolding process, a negative pressure is first provided to the negative pressure distribution chamber 2 through an external vacuum generator. The negative pressure acts evenly on the micropores 7 on the flexible adsorption panel 3 through independent airflow channels 9, generating a uniform negative pressure adsorption force, enabling the flexible adsorption panel 3 to firmly and without damage grip the outer edge of the lens cover. Subsequently, the micro linear actuator in the external control system drive mechanism 5 drives the common drive plate 14 forward, causing all precision push rods 8 to extend synchronously from the flexible adsorption panel 3. The spherical or arc-shaped front end of these rods gently contacts and supports the inner cavity wall of the lens cover. This structural mode, which combines external negative pressure adsorption with internal rigid support, effectively prevents the deep cavity thin-walled lens cover from plastic deformation, collapse, or breakage due to insufficient structural strength during demolding, while also avoiding clamping marks on the outer surface that may be caused by traditional mechanical grippers. After demolding, the drive mechanism 5 retracts the precision ejector pin 8, and the negative pressure is simultaneously shut off, separating the auxiliary fixture from the lens cover. The entire process can be directly applied to the production line without any modification to the existing injection mold, significantly improving the yield and quality stability of deep-cavity, thin-walled lens cover production.

[0031] The working process of this utility model is as follows: First, external automated equipment precisely positions the auxiliary fixture at the lens cover molding position of the injection mold via a standard mechanical interface 10. After injection molding is complete and the mold is opened, the auxiliary fixture moves forward under control system commands, bringing the flexible adsorption panel 3 into contact with the outer edge of the lens cover. At this time, an external vacuum generator provides negative pressure to the negative pressure distribution chamber 2 via the negative pressure interface 12. This negative pressure is evenly transmitted to each micropore 7 of the flexible adsorption panel 3 through multiple independent airflow channels 9, forming a uniformly distributed negative pressure adsorption force, allowing the flexible adsorption panel 3 to firmly adsorb the outer edge of the lens cover. The annular sealing flange 11 ensures an airtight connection between the flexible adsorption panel 3 and the negative pressure distribution chamber 2, preventing negative pressure leakage. After the outer edge adsorption is complete, the control system sends a signal to the drive mechanism 5. The micro linear actuator pushes the common drive plate 14 forward, overcoming the elasticity of the return spring 15, causing all precision push rods 8 to extend synchronously from the flexible adsorption panel 3. Each precision ejector pin 8 moves smoothly along the axial direction under the precise guidance of the guide sleeve 13. The spherical or arc-shaped front end gently contacts the inner wall of the lens cover, providing uniform internal support. After the lens cover is completely removed from the mold core, the control system first instructs the drive mechanism 5 to de-energize. The return spring 15 pushes the common drive plate 14 backward, causing all precision ejector pins 8 to retract synchronously to their initial positions. Subsequently, the control system shuts down the external vacuum generator, the negative pressure disappears, and the flexible adsorption panel 3 separates from the lens cover. Finally, external automated equipment moves the auxiliary fixture away from the working area, completing the entire demolding process. Throughout the entire process, the synergistic effect of the outer edge negative pressure adsorption and the rigid support of the inner cavity effectively prevents deformation and damage to the deep cavity thin-walled lens cover during demolding, ensuring product quality and production efficiency.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. An auxiliary fixture for demolding a lens cover after injection molding, comprising a base (1), characterized in that: The base (1) has an installation cavity (6) at its front end; a negative pressure distribution cavity (2) is fixedly installed in the installation cavity (6), and the front end of the negative pressure distribution cavity (2) has an opening structure; a flexible adsorption panel (3) is covered at the front opening of the negative pressure distribution cavity (2), the flexible adsorption panel (3) is made of elastic silicone material, the flexible adsorption panel (3) has multiple micropores (7) penetrating its thickness, the negative pressure distribution cavity (2) has multiple independent airflow channels (9) inside, each airflow channel (9) is connected to the corresponding micropores (7) on the flexible adsorption panel (3), and a conical silicone sealing plug is embedded at the outlet end of each airflow channel (9); a micro support arm array (4) is embedded inside the silicone matrix of the flexible adsorption panel (3), the micro support arm array (4) is composed of several precision push rods (8), each precision push rod (8) is fitted with a low friction coefficient plastic sleeve and then embedded The flexible adsorption panel (3) is located in the silicone matrix of the flexible adsorption panel (3). The silicone matrix of the flexible adsorption panel (3) has an array of mounting holes that are interference fit with the sleeve. The precision push rods (8) are arranged in a ring array in the silicone matrix of the flexible adsorption panel (3) and are located in the gap between the micropores (7). The base (1) is provided with a drive mechanism (5). The drive mechanism (5) is connected to an external control system through a signal line. The drive mechanism (5) is connected to the rear end of each precision push rod (8) and is used to drive each precision push rod (8) to extend or retract along its axial direction. The negative pressure distribution chamber (2) has a negative pressure interface (12) on its side wall. The negative pressure interface (12) is used to connect to an external vacuum generator through a hose. The rear end of the base (1) has a standard mechanical interface (10). The standard mechanical interface (10) is used to connect to an external robotic arm or fixed bracket.

2. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The micropores (7) are uniformly distributed in an array on the flexible adsorption panel (3); the pore size of the micropores (7) is 0.3 mm to 0.8 mm; the center distance between adjacent micropores (7) is 1.0 mm to 2.0 mm.

3. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1 or 2, characterized in that: The precision push rod (8) is made of stainless steel or ceramic material; the diameter of the precision push rod (8) is 0.3 mm to 0.8 mm; the front end of the precision push rod (8) is machined into a spherical shape or an arc shape.

4. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The drive mechanism (5) is a miniature linear actuator.

5. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1 or 4, characterized in that: The drive mechanism (5) includes a common drive plate (14); the common drive plate (14) is simultaneously connected to the rear end of all precision push rods (8) to realize the synchronous extension or retraction of all precision push rods (8).

6. The auxiliary fixture for demolding lens protective cap injection molding according to claim 5, characterized in that: A return spring (15) is provided between the common drive plate (14) and the fixing plate (16) of the base (1). The return spring (15) is axially sleeved on the precision push rod (8), with one end abutting against the fixing plate (16) of the base (1) and the other end abutting against the bottom of the common drive plate (14).

7. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The flexible adsorption panel (3) is provided with an annular sealing flange (11) around its periphery; the annular sealing flange (11) is press-fitted with the front opening edge of the negative pressure distribution cavity (2) to form an airtight connection.

8. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The base (1) has a guide sleeve (13) on the fixing plate (16) inside; each of the precision push rods (8) passes through the guide sleeve (13); the inner wall of the guide sleeve (13) and the outer surface of the precision push rod (8) are in clearance fit.

9. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The base (1) is made of aluminum alloy; the base (1) has a cylindrical or cuboid shape; the mounting cavity (6) has a stepped hole structure.

10. The auxiliary fixture for demolding lens protective cap injection molding according to claim 1, characterized in that: The thickness of the flexible adsorption panel (3) is 3 mm to 5 mm; the surface hardness of the flexible adsorption panel (3) is Shore A 40 to 60 degrees.

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