Connecting rod pulling type arc core pulling mechanism, injection mold and arc core pulling method

Abstract

The invention relates to a connecting rod pulling type arc core pulling mechanism, an injection mold and an arc core pulling method. The connecting rod pulling type arc core pulling mechanism comprises a mold locking block, an arc sliding block, a driving sliding block and an inclined guide column. The driving sliding block is located between the die locking block and the arc sliding block, and the inclined guide column obliquely penetrates through the die locking block and the driving sliding block, is fixedly connected with the driving sliding block and is used for driving the driving sliding block to be close to or away from the die locking block. The driving sliding block is connected with the arc sliding block through the connecting rod assemblies on the two sides so as to drive the arc sliding block to move along the preset arc track. During mold closing, the inclined guide column drives the driving sliding block to press against the mold locking block, so that the mechanism is locked, and the connecting rod assembly is in an upward inclined state. During mold opening, the inclined guide column drives the driving sliding block to be away from the mold locking block in the inclined direction, the driving sliding block pulls the arc sliding block to move along the arc track through the connecting rod assembly to complete core pulling, and the connecting rod assembly is subjected to angular deflection. The linear motion of the inclined guide column is converted into the arc motion of the arc sliding block through the connecting rod assembly, and accurate pulling of the arc inverted buckle in the mold cavity is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more particularly, to a connecting rod pulling type circular arc core pulling mechanism, an injection mold, and a circular arc core pulling method. Background Art

[0002] In the field of plastic mold manufacturing, for products with concave circular arc surfaces (such as pipe joints, arc-shaped buckles, etc.), a circular arc core pulling mechanism is often required to achieve demolding. Traditional solutions mainly rely on the following two structures:

[0003] Gear and rack drive type: converting linear motion into rotational motion, but there are problems such as backlash wear and accuracy attenuation, and long-term use is likely to cause product size fluctuations;

[0004] T-slot slider type: using an inclined guide pillar to drive the slider to move along the T-slot in a curved motion, but the groove body is complex to machine and has a large frictional resistance, and it is easy to get stuck especially in the scenarios of small arc and short stroke.

[0005] The above two structures have large motion trajectory deviations, short wear life, and poor space adaptability for compact molds. Therefore, there is an urgent need for a circular arc core pulling mechanism with low friction, high precision, and easy maintenance. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a connecting rod pulling type circular arc core pulling mechanism, an injection mold, and a circular arc core pulling method in view of the above-mentioned defects of the prior art.

[0007] On the one hand, the technical solution adopted by the present invention to solve its technical problems is: a connecting rod pulling type circular arc core pulling mechanism, which includes a locking module, a circular arc slider, a driving slider, and an inclined guide pillar: the driving slider is located between the locking module and the circular arc slider; the inclined guide pillar obliquely penetrates through the locking module and the driving slider; the inclined guide pillar is fixedly connected to the driving slider and can drive the driving slider to approach or move away from the locking module; both sides of the end of the driving slider facing away from the locking module are provided with connecting rod assemblies; the first end of the connecting rod assembly is rotatably connected to the driving slider, and the second end is rotatably connected to the circular arc slider; the driving slider drives the circular arc slider to move along a preset circular arc track through the two connecting rod assemblies;

[0008] When the locking module and the driving slider are in mold closing, the inclination angle of the inclined guide pillar drives the driving slider to press against the inner wall of the locking module, so that the driving slider and the circular arc slider are in a mold closing position close to the locking module, and at this time the connecting rod assembly is in an upward inclined state;

[0009] When the lock module and the driving slider are used for mold opening, the angled guide pillar drives the driving slider to move along the inclined direction of the angled guide pillar and away from the lock module. The driving slider pulls the arc slider through the connecting rod assembly, causing it to move along a preset arc track to complete the core-pulling action. At this time, the connecting rod assembly deflects in angle.

[0010] In the arc core-pulling mechanism driven by a connecting rod according to the present invention, a first movable groove for accommodating the first end of the connecting rod assembly is provided on the driving slider; the upper top surface of the first movable groove is a first stop surface that slopes upward, and the lower bottom surface is a second stop surface that is horizontally arranged; the first end of the connecting rod assembly can rotate between the first stop surface and the second stop surface.

[0011] In the arc core-pulling mechanism driven by a connecting rod according to the present invention, a second movable groove corresponding to the first movable groove and for accommodating the second end of the connecting rod assembly is provided on the arc slider; the upper top surface of the second movable groove is a third stop surface, and the lower bottom surface is a fourth stop surface; the third stop surface and the fourth stop surface are arranged at an angle; the second end of the connecting rod assembly can rotate between the third stop surface and the fourth stop surface; when the lock module and the driving slider are closed, the first stop surface on the driving slider is parallel to the fourth stop surface of the arc slider.

[0012] In the arc core-pulling mechanism driven by a connecting rod according to the present invention, the arc core-pulling mechanism further includes a composite buffer and guiding assembly; the composite buffer and guiding assembly is arranged between the driving slider and the lock module, and is used for keeping the two pressed tightly in the closed mold state, providing a buffer force in the initial stage of mold opening, and controlling the initial separation gap between the driving slider and the lock module.

[0013] In the arc core-pulling mechanism driven by a connecting rod according to the present invention, the composite buffer and guiding assembly includes a main body frame, an elastic buffer member, a guiding module, and a limiting member.

[0014] The main body frame is installed between the end face of the driving slider close to the lock module and the inner wall of the lock module; the elastic buffer member includes at least two sets of concentrically sleeved spring groups, which are arranged in the chamber of the main body frame and are used for providing a buffer force and a pre-tightening force; the guiding module includes at least two guiding sliders, which are arranged between the main body frame and the driving slider or the lock module, and the guiding sliders can form a sliding fit with the corresponding mating surfaces of the driving slider or the lock module, and are used for allowing the driving slider to make minor angular and position adjustments in the initial stage of mold opening.

[0015] The limiting member is arranged on the main body frame and is used for providing an additional buffer force or a trigger signal when the elastic buffer member is compressed to near the limit stroke.

[0016] In the link-pulling circular core-pulling mechanism of the present invention, the spring group includes an outer disc spring and an inner disc spring. The outer disc spring is located outside the inner disc spring. The outer disc spring provides the main buffering stroke, and the inner disc spring provides the ability to quickly absorb initial impacts.

[0017] In the link-pulling circular core-pulling mechanism of the present invention, the guiding module further includes a pressure sensor and a micro-adjustment mechanism integrated in the main body frame. The pressure sensor is used to monitor the force condition of the elastic buffer during the buffering process, and the micro-adjustment mechanism is used to dynamically adjust the performance parameters of the elastic buffer or the guiding module according to the feedback signal of the pressure sensor.

[0018] In the link-pulling circular core-pulling mechanism of the present invention, a groove for inserting a part of the driving slider is provided at the lower end of the locking module; the upper top surface of the groove is a pressing plane that cooperates with and abuts against the upper surface of the driving slider; the side surface of the groove is a sliding inclined surface that cooperates with and slidably connects to the side surface of the driving slider.

[0019] In a second aspect, the present invention also provides an injection mold, wherein the mold includes the link-pulling circular core-pulling structure as described in any one of the above. The circular core slider in the circular core-pulling structure is installed on the circular guide rail of the injection mold and is used to extract the arc undercut in the mold cavity.

[0020] In a third aspect, the present invention also provides a circular core-pulling method applied to the link-pulling circular core-pulling mechanism as described in any one of the above, which includes the following steps:

[0021] Clamping and locking: The inclined guide post drives the driving slider to press against the locking module; the driving slider then drives the circular core slider through the link assembly, so that both the driving slider and the circular core slider are in the clamping position close to the locking module; at this time, the link assembly is in the initial upwardly inclined state, and the mechanism completes the locking.

[0022] Mold opening: The inclined guide post uses its inclined angle to drive the driving slider to move along the inclined direction of the inclined guide post, so that the driving slider gradually moves away from the locking module.

[0023] Movement of the circular core slider: As the driving slider is driven by the inclined guide post to move away from the locking module, the first end of the link assembly on the driving slider moves accordingly; the link assembly transmits the movement of the driving slider to the circular core slider, enabling it to move along a preset circular track to complete the core-pulling action; during the movement of the circular core slider, the link assembly deflects in angle from the initial upwardly inclined state.

[0024] Core pulling: The arc slider moves along the arc track to the predetermined end position to complete the core pulling action, separating the molding part from the workpiece. At this time, the driving slider has moved to the mold opening position away from the locking module, and the connecting rod assembly is also in the corresponding mold opening state.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention uses an inclined guide pillar to drive the driving slider, and then pulls the arc slider through two connecting rod assemblies, realizing the conversion of the inclined movement of the inclined guide pillar into the arc movement of the arc slider. This two-stage transmission structure is reasonably designed, with smooth movement conversion, and can accurately guide the arc slider to move along the preset track to complete the core pulling of the arc undercut. Compared with directly driving the arc slider by the inclined guide pillar, this indirect transmission method is easier to accurately control the movement path of the arc slider, ensuring that the core pulling action is accurate and in place, especially suitable for molding workpieces with precise arc features.

[0027] 2. During mold closing, the inclination angle of the inclined guide pillar ensures that the driving slider reliably presses against the inner wall of the locking module. This pressing not only plays a positioning role but also makes the entire mechanism more stable in the mold closing state, capable of withstanding a certain lateral force, ensuring the accuracy and strength when the mold is closed.

[0028] 3. The driving slider is arranged between the locking module and the arc slider, and the two sides are connected by connecting rod assemblies, making the layout of the entire mechanism more compact.

[0029] 4. This connecting rod pulling type arc core pulling mechanism can be easily integrated into various injection molds. By installing the arc slider on the arc guide rail of the mold, it can be used to pull out arc undercuts of various sizes and angles, with good versatility and practicability. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will further illustrate the present invention in conjunction with the drawings and embodiments. The drawings in the following description are only partial embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0031] Figure 1 is a schematic structural diagram of a connecting rod pulling type arc core pulling mechanism according to Embodiment 1 of the present invention;

[0032] Figure 2 is a schematic internal structure diagram of a connecting rod pulling type arc core pulling mechanism according to Embodiment 1 of the present invention;

[0033] Figure 3 is Figure 1 a three-dimensional exploded view of the arc core pulling mechanism in

[0034] Figure 4 is Figure 3 a schematic structural view of the composite buffer guiding component 16 in it. Specific embodiments

[0035] The terms "first", "second", "third", "fourth", etc. in the description and claims of the present invention and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0036] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] "Plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0038] Moreover, the orientation terms "upper, lower, front, rear, left, right, upper end, lower end, longitudinal", etc. are all referenced based on the attitude position of the device or equipment described in this solution during normal use.

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] Embodiment 1:

[0041] A link pulling type circular arc core pulling mechanism of a preferred embodiment of the present invention, as Figure 3As shown in the figure, a connecting rod pulling type circular arc core-pulling mechanism includes a locking module 11, a circular arc slider 12, a driving slider 13 and a tapered ejector pin 14: The driving slider 13 is located between the locking module 11 and the circular arc slider 12; The tapered ejector pin 14 penetrates through the locking module 11 and the driving slider 13 obliquely; The tapered ejector pin 14 is fixedly connected to the driving slider 13 and is slidably connected to the locking module 11; And it can drive the driving slider 13 to approach or move away from the locking module 11; On both sides of the end of the driving slider 13 facing away from the locking module 11, there are connecting rod assemblies 15; The first end of the connecting rod assembly 15 is rotatably connected to the driving slider 13, and the second end is rotatably connected to the circular arc slider 12; The driving slider 13 drives the circular arc slider to move along the preset circular arc track 01 through the two connecting rod assemblies 15;

[0042] In the present invention, the tapered ejector pin is used to drive the driving slider, and then the circular arc slider is pulled through two connecting rod assemblies, realizing the conversion of the inclined movement of the tapered ejector pin into the circular arc movement of the circular arc slider. This two-stage transmission structure is reasonably designed, and the movement conversion is smooth. It can accurately guide the circular arc slider to move along the preset track, complete the core-pulling of the arc undercut. Compared with directly driving the circular arc slider by the tapered ejector pin, this indirect transmission method is easier to accurately control the movement path of the circular arc slider, ensuring that the core-pulling action is accurate and in place, and is especially suitable for forming parts with precise arc features.

[0043] Among them, when the locking module 11 and the driving slider 13 are closed, the inclined angle of the tapered ejector pin 14 drives the driving slider 13 to press against the inner wall of the locking module 11, so that the driving slider 13 and the circular arc slider 12 are in the closed mold position close to the locking module 11. At this time, the connecting rod assembly 15 is in an upward inclined state. By utilizing the component force generated by the angle of the tapered ejector pin, the driving slider is forcibly positioned on the inner wall of the locking module, which ensures that in the closed mold state, the positions of the driving slider and the circular arc slider are accurate and stable, providing reliable support for subsequent injection molding and avoiding molding defects caused by position deviation.

[0044] When the locking module 11 and the driving slider 13 are opened, the tapered ejector pin 14 drives the driving slider 13 to move along the inclined direction of the tapered ejector pin 14 and away from the locking module 11. The driving slider 13 pulls the circular arc slider 12 through the connecting rod assembly 15, so that it moves along the preset circular arc track 01 to complete the core-pulling action. At this time, the connecting rod assembly 15 deflects in angle. The driving slider moves in a straight line or approximately straight line along the inclined direction of the tapered ejector pin. Through the connecting rod assembly, the circular arc slider needs to move in a circular arc. The connecting rod assembly, as a rotatable connecting piece, changes its own angle as the driving slider moves. This angle deflection makes the movement transmission more gentle, can absorb or buffer part of the impact force, thereby realizing a more stable core-pulling action, reducing the impact on the mold and equipment, reducing noise, and improving the stability of the core-pulling process.

[0045] In this embodiment, a first movable groove 131 for accommodating the first end of the link assembly 15 is provided on the driving slider 13; the upper top surface of the first movable groove 131 is a first stop surface 132 that slopes upward, and the lower bottom surface is a second stop surface 133 that is horizontally arranged; the first end of the link assembly 15 can rotate between the first stop surface 132 and the second stop surface 133. When the first end of the link rotates in the first movable groove, its movement trajectory is restricted within the range of the groove. When the link assembly 15 rotates upward due to the movement of the driving slider 13, its first end will first contact the upward-sloping first stop surface 132. At this time, the link assembly remains in an upward-sloping state, and the locking module 11 and the driving slider 13 are in the mold-closing state. The horizontal second stop surface 133 provides a downward limit for the first end of the link assembly 15. When the link needs to rotate downward, the second stop surface prevents it from sagging excessively, ensuring the installation stability of the link on the driving slider and the controllability of the movement range. At this time, the link assembly remains horizontal, and the locking module 11 and the driving slider 13 are in the mold-opening state.

[0046] In this embodiment, the link assembly 15 includes a connecting rod 151, a first rotating shaft 152, and a second rotating shaft 153; the first end of the connecting rod is rotatably connected to the driving slider 13 through the first rotating shaft, and the second end of the connecting rod is rotatably connected to the arc slider 13 through the second rotating shaft.

[0047] In this embodiment, a second movable groove 121 corresponding to the first movable groove 131 and accommodating the second end of the link assembly 15 is provided on the arc slider 12; the upper top surface of the second movable groove 121 is a third stop surface 122, and the lower bottom surface is a fourth stop surface 123; the third stop surface 122 and the fourth stop surface 123 are arranged at an angle; the second end of the link assembly 15 can rotate between the third stop surface 122 and the fourth stop surface 123; when the locking module 11 and the driving slider 13 are in the mold-closing state, the first stop surface 132 on the driving slider 13 is parallel to the fourth stop surface 123 of the arc slider 12, ensuring that the link assembly 15 is in a definite and preset initial "upward-sloping" state at this time.

[0048] When the mold-opening action starts and the driving slider 13 moves downward and away from the locking module 11 driven by the inclined guide post 14, it pulls the arc slider 12 through the link assembly 15. The first end of the link assembly 15 rotates in the first movable groove of the driving slider (limited by 132 and 133), and the second end rotates in the second movable groove of the arc slider (limited by 122 and 123). Due to the different angles of the stop surfaces of the two ends of the movable groove (one end is "upward inclination + horizontal", and the other end is "angle"), this difference, combined with the horizontal movement of the driving slider, forces the link assembly 15 to undergo a specific angular change. This angular change is precisely converted into the movement of the arc slider 12 along the preset arc track through geometric relationships.

[0049] The included angle between the third stop surface 122 and the fourth stop surface 123 determines the effective range and direction of rotation of the arc-shaped slider 12 during the conversion of mold opening and closing, playing a guiding and limiting role, ensuring that the arc-shaped slider moves strictly along the designed trajectory, and preventing its movement from deviating or jamming.

[0050] Optionally, in another embodiment, the arc core-pulling mechanism further includes a compound buffer guiding assembly 16; the compound buffer guiding assembly 16 is arranged between the driving slider 13 and the locking module 11, and is used to keep the two pressed tightly in the mold-closed state, and provide a buffer force at the initial stage of mold opening, control the initial separation gap between the driving slider 13 and the locking module 11, and can accurately control the initial speed and stroke of the driving slider 13 departing from the inner wall of the locking module 11, so as to accurately control the starting point of the connecting rod assembly 15 to start driving the arc-shaped slider 12 to move. This helps to ensure that the movement trajectory of the arc-shaped slider conforms to the design requirements from the starting point, avoids trajectory deviation caused by too fast or too slow initial separation, and improves the core-pulling accuracy; this is more reliable and stable than simply relying on the component force generated by the inclination angle of the inclined guide post 14, especially when bearing the molding pressure or vibration, it can effectively prevent the driving slider from loosening or shifting accidentally, and ensure the accuracy and stability of the mold closed state.

[0051] By setting the compound buffer guiding assembly, in the mold-closed state, the elastic buffer member (such as a disc spring) provides a pre-tightening force to ensure that the driving slider and the locking module are closely fitted, guaranteeing the mold-closed accuracy. At the initial stage of mold opening, the inclined guide post 14 starts to drive the driving slider 13 to move. The elastic buffer member can absorb and buffer the impact force when the driving slider and the locking module are separated, and allows the driving slider to make small angular and position adjustments through the guiding module, avoiding hard impact, making the separation process of the driving slider 13 and the locking module 11 smoother, reducing the impact and noise caused by hard contact, prolonging the service life of relevant components (especially the contact surfaces of the inclined guide post and the driving slider and the locking module), and improving the smoothness of mold opening.

[0052] As Figure 4 shown, further, the compound buffer guiding assembly 16 includes a main body frame 161, an elastic buffer member 162, a guiding module 163 and a limiting member 164;

[0053] The main body frame 161 is installed between the end face of the driving slider 13 close to the locking module 11 and the inner wall of the locking module 11; the elastic buffer member 162 includes at least two groups of concentrically sleeved spring groups, which are arranged in the cavity of the main body frame 161 and are used to provide buffer force and pre-tightening force; the guiding module 163 includes at least two guiding sliders 1631, which are arranged between the main body frame 161 and the driving slider 13 or the locking module 11, and the guiding sliders 1631 can form a sliding fit with the corresponding mating surfaces of the driving slider 13 or the locking module 11, and are used to allow the driving slider 13 to make small angular and position adjustments at the initial stage of mold opening;

[0054] The spring assembly includes an outer conical spring 1621 and an inner conical spring 1622. The outer conical spring 1621 is located outside the inner conical spring 1622. The outer conical spring 1621 provides the main buffering stroke, can absorb a large separation force, and prevent the driving slider 13 from being impacted too much due to inertia or the sudden detachment of the locking module 11 at the initial stage of mold opening; the inner conical spring 1622 provides a fast initial shock absorption ability, making the buffering process more controllable. By concentrically sleeving the two layers of springs, an optimized combination of buffering characteristics can be achieved. In the initial stage, the inner spring quickly absorbs the shock, and then the outer spring provides the main and smoother buffering force, making the whole buffering process smoother and more controllable, reducing mechanical shock and noise; optionally, the pressure sensor and the micro-adjustment mechanism can monitor and dynamically adjust the buffering state in real time, further improving the control accuracy and adaptability, and being able to cope with different mold opening speeds and working conditions.

[0055] Furthermore, the guiding module 163 further includes a pressure sensor and a micro-adjustment mechanism integrated in the main body frame 161. The pressure sensor is used to monitor the force condition of the elastic buffer 162 during the buffering process, and the micro-adjustment mechanism is used to dynamically adjust the performance parameters of the elastic buffer 162 or the guiding module 163 or the limiting member 164 according to the feedback signal of the pressure sensor. For example, the pre-tightening force of the spring can be finely adjusted, or the trigger point of the limiting member can be adjusted; making the whole arc core-pulling mechanism maintain high precision, high smoothness and high reliability under various working conditions, and being a key component to improve the overall performance and service life of the mold.

[0056] The limiting member 164 is movably arranged on the main body frame 161 and is connected to the outer conical spring 1621 or the inner conical spring 1622 on the elastic buffer 162, and is used to provide an additional buffering force or a trigger signal when the elastic buffer 162 is compressed to near the limit stroke. The limiting member 164 has elasticity.

[0057] In this embodiment, the upper surface of the driving slider 13 is a plane, and the inclined guide post 14 obliquely penetrates through the upper and lower ends of the driving slider 13; the side surface of the slider facing the locking module 11 is an inclined surface parallel to the inclined guide post 14. The lower end of the locking module 11 is provided with a groove 111 for part of the driving slider 13 to be inserted; the upper top surface of the groove 111 is a pressing plane 112 that cooperates with and abuts against the upper surface of the driving slider 13; the side surface of the groove 111 is a sliding inclined surface 113 that cooperates with and is slidably connected to the side surface of the driving slider 13.

[0058] When the locking module 11 and the driving slider 13 are closed, the pressing plane 112 of the groove 111 is in close contact with the upper surface of the driving slider 13. This provides a clear pressing force transmission surface perpendicular to the mold opening direction, ensuring that the driving slider is reliably pressed against the inner wall of the locking module to prevent it from loosening or displacing in the closed mold state; this surface contact pressing method is more stable than point or line contact.

[0059] When the mold is opened, the angled guide pillar 14 drives the driving slider 13 to move, and the inclined side of the driving slider 13 slides along the sliding inclined surface 113 of the groove 111. Since the two are parallel, this sliding fit provides an accurate guidance, ensuring that the driving slider 13 moves strictly in the direction specified by the inclination angle of the angled guide pillar 14, reducing the wobbling or skewing during the movement and improving the smoothness and accuracy of the movement.

[0060] Embodiment Two:

[0061] An injection mold, wherein the mold includes a connecting rod pulling type circular arc core-pulling structure as in Embodiment One, and the circular arc slider in the circular arc core-pulling structure is installed on the circular arc guide rail of the injection mold for pulling out the arc undercut in the mold cavity.

[0062] Applying the connecting rod pulling type circular arc core-pulling mechanism in Embodiment One to the injection mold enables the mold to efficiently, reliably and smoothly handle the problem of pulling out the arc undercut, directly improving the quality of the final product and contributing to extending the service life of the mold itself. It is an effective and advanced technical solution for processing the forming of such complex structures.

[0063] Embodiment Three:

[0064] A circular arc core-pulling method applied to the connecting rod pulling type circular arc core-pulling mechanism as in Embodiment One, which includes the following steps:

[0065] Closing and locking: The angled guide pillar drives the driving slider to press against the locking module; the driving slider then drives the circular arc slider through the connecting rod assembly, so that both the driving slider and the circular arc slider are in the closed mold position close to the locking module; at this time, the connecting rod assembly is in the initial upward inclined state and the mechanism is locked;

[0066] Opening the mold: Relative movement occurs between the locking module and the driving slider; the angled guide pillar uses its inclination angle to drive the driving slider to move along the inclination direction of the angled guide pillar, so that the driving slider gradually moves away from the locking module;

[0067] Moving of the circular arc slider: As the driving slider is driven by the angled guide pillar to move away from the locking module, the first end of the connecting rod assembly on the driving slider moves accordingly; the connecting rod assembly transmits the movement of the driving slider to the circular arc slider, enabling it to move along the preset circular arc track to complete the core-pulling action; during the movement of the circular arc slider, the connecting rod assembly deflects in angle from the initial upward inclined state;

[0068] Core pulling: The arc-shaped slider moves along the arc track to the predetermined end position, completing the core pulling action, causing the molded part to separate from the workpiece. At this time, the driving slider has moved to the mold opening position away from the locking module, and the connecting rod assembly is also in the corresponding mold opening state.

[0069] By utilizing the synergistic effect of the inclined guide pillar and the connecting rod assembly, precise and stable control of the arc-shaped slider is achieved. The advantages are as follows: During mold closing, it can be reliably locked to ensure the stability of the mold closed state. During the mold opening and core pulling process, the connecting rod assembly smoothly converts the linear motion of the inclined guide pillar into the arc track motion of the arc-shaped slider, not only precisely extracting the arc-shaped undercut, ensuring the quality of the workpiece, but also making the entire core pulling action more stable and controllable, reducing impact and wear, thereby improving the reliability and service life of the mold operation.

[0070] It should be understood that for those of ordinary skill in the art, improvements or modifications can be made according to the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A connecting rod pulling type circular arc core-pulling mechanism, characterized in that, It includes a lock module, an arc slider, a driving slider, and an inclined guide pillar: The driving slider is located between the lock module and the arc slider; The inclined guide pillar penetrates through the lock module and the driving slider obliquely; The inclined guide pillar is fixedly connected to the driving slider and can drive the driving slider to approach or move away from the lock module; On both sides of one end of the driving slider facing away from the lock module, there are link assemblies; The first end of the link assembly is rotatably connected to the driving slider, and the second end is rotatably connected to the arc slider; The driving slider drives the arc slider to move along a preset arc track through the two link assemblies; When the lock module and the driving slider are in the mold closing state, the inclination angle of the inclined guide pillar drives the driving slider to press against the inner wall of the lock module, so that the driving slider and the arc slider are in the mold closing position close to the lock module. At this time, the link assembly is in an upward inclined state; When the lock module and the driving slider are in the mold opening state, the inclined guide pillar drives the driving slider to move along the inclination direction of the inclined guide pillar and move away from the lock module. The driving slider pulls the arc slider through the link assembly, making it move along the preset arc track to complete the core pulling action. At this time, the link assembly deflects in angle.

2. The link-pulling type circular arc core-pulling mechanism according to claim 1, characterized in that, On the driving slider, there is a first movable groove for accommodating the first end of the link assembly; The upper top surface of the first movable groove is a first stop surface that is upward inclined, and the lower bottom surface is a second stop surface that is horizontally arranged; The first end of the link assembly can rotate between the first stop surface and the second stop surface.

3. The link-pulling circular core-pulling mechanism according to claim 2, wherein On the arc slider, there is a second movable groove corresponding to the first movable groove and for accommodating the second end of the link assembly; The upper top surface of the second movable groove is a third stop surface, and the lower bottom surface is a fourth stop surface; The third stop surface and the fourth stop surface are arranged at an angle; The second end of the link assembly can rotate between the third stop surface and the fourth stop surface; When the lock module and the driving slider are in the mold closing state, the first stop surface on the driving slider is parallel to the fourth stop surface on the arc slider.

4. The link-pulling type circular arc core-pulling mechanism according to any one of claims 1-3, characterized in that, The arc core pulling mechanism further includes a compound buffer guiding component; The compound buffer guiding component is arranged between the driving slider and the lock module, and is used to keep the two pressed tightly in the mold closing state, and provide a buffer force in the initial stage of mold opening to control the initial separation gap between the driving slider and the lock module.

5. The link-pulling type circular arc core-pulling mechanism according to claim 4, wherein, The compound buffer guiding component includes a main body frame, an elastic buffer member, a guiding module, and a limiting member; The main body frame is installed between the end face of the driving slider close to the lock module and the inner wall of the lock module; The elastic buffer member includes at least two sets of concentrically sleeved spring groups, which are arranged in the cavity of the main body frame and are used to provide buffer force and pre-tightening force; The guiding module includes at least two guiding sliders, which are arranged between the main body frame and the driving slider or the lock module. The guiding sliders can form a sliding fit with the corresponding mating surfaces of the driving slider or the lock module, and are used to allow the driving slider to make minor angular and position adjustments in the initial stage of mold opening; The limiting member is arranged on the main body frame and is used to provide additional buffering force or trigger signal when the elastic buffer is compressed to near the limit stroke.

6. The link-pulling type circular arc core-pulling mechanism according to claim 5, wherein The spring group includes an outer disc spring and an inner disc spring. The outer disc spring is located outside the inner disc spring. The outer disc spring provides the main buffering stroke, and the inner disc spring provides the ability to absorb rapid initial impacts.

7. The link-pulling type circular arc core-pulling mechanism according to claim 5, characterized in that The guiding module further includes a pressure sensor and a micro-adjustment mechanism integrated in the main body frame. The pressure sensor is used to monitor the force condition of the elastic buffer during the buffering process, and the micro-adjustment mechanism is used to dynamically adjust the performance parameters of the elastic buffer or the guiding module according to the feedback signal of the pressure sensor.

8. The link-pulling type circular arc core-pulling mechanism according to claim 7, characterized in that A groove for inserting a part of the driving slider is provided at the lower end of the locking module; the upper top surface of the groove is a pressing plane that cooperates with and abuts against the upper surface of the driving slider; the side surface of the groove is a sliding inclined surface that cooperates with and is slidably connected to the side surface of the driving slider.

9. An injection mold, characterized in that, The mold includes the connecting rod pulling type circular arc core-pulling structure according to any one of claims 1 to 8. The circular arc slider in the circular arc core-pulling structure is installed on the circular arc guide rail of the injection mold and is used for pulling out the arc undercut in the mold cavity.

10. A method for arc core pulling, which is applied to the link pulling type arc core pulling mechanism described in any one of claims 1 to 8, and is characterized in that, Including the following steps: Clamping and locking: The inclined guide post drives the driving slider to press against the locking module; the driving slider then drives the circular arc slider through the connecting rod assembly, so that both the driving slider and the circular arc slider are in the clamping position close to the locking module; at this time, the connecting rod assembly is in the initial upward inclined state, and the mechanism completes locking; Mold opening: The inclined guide post uses its inclined angle to drive the driving slider to move along the inclined direction of the inclined guide post, so that the driving slider gradually moves away from the locking module; Movement of the circular arc slider: As the driving slider is driven by the inclined guide post to move away from the locking module, the first end of the connecting rod assembly on the driving slider moves accordingly; the connecting rod assembly transmits the movement of the driving slider to the circular arc slider, causing it to move along a preset circular arc track to complete the core-pulling action; during the movement of the circular arc slider, the connecting rod assembly deflects in angle from the initial upward inclined state; Core-pulling: The circular arc slider moves along the circular arc track to a predetermined end position to complete the core-pulling action, so that the molded part is separated from the workpiece; at this time, the driving slider has moved to the mold opening position away from the locking module, and the connecting rod assembly is also in the corresponding mold opening state.

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