Pitched roof auxiliary mechanism and mold thereof

Abstract

The invention belongs to the technical field of injection molds, and particularly relates to a pitched roof auxiliary mechanism and a mold thereof. A pitched roof auxiliary mechanism is used for achieving demolding of a large-gradient injection molding part in a mold with a secondary mold opening function, the pitched roof auxiliary mechanism comprises a pitched roof rod and an auxiliary rod parallel to the pitched roof rod, and the pitched roof auxiliary mechanism further comprises a pitched roof base, the lower end of the pitched roof rod is movably supported in the pitched roof base; the upper end part of the auxiliary rod is rotatably arranged in the fixed seat in a penetrating manner; the floating compensation assembly comprises a sliding seat, a floating compensation assembly and a floating compensation assembly, and a linear guide sliding groove is defined on the sliding seat; and the sliding pin is fixedly arranged at the lower end part of the auxiliary rod and can be accommodated in the guide sliding groove in a sliding manner, so that a compensation mechanism which allows the auxiliary rod to perform preset linear floating displacement relative to the sliding seat is formed.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and particularly relates to a slanted ejector auxiliary mechanism and its mold. Background Technology

[0002] Injection molding is a core process in modern industrial production for the large-scale, high-efficiency manufacture of plastic products, playing an indispensable role, especially in precision manufacturing fields such as automobile manufacturing, electronics, and medical devices. To produce plastic parts with various complex shapes, the structural design of injection molds is crucial. Particularly when the plastic part has undercut features such as recesses or side holes, special ejection mechanisms, such as slides and angled ejectors, must be used to smoothly remove the part from the mold cavity. Among these, the angled ejector mechanism, due to its compact structure and reliable operation, is one of the most commonly used and critical technical means to solve the problem of external undercuts in products.

[0003] As product designs become increasingly complex, especially in large automotive interior parts and bumpers, there are often large-angle, long-stroke undercut features, requiring the use of steeply sloped ejector mechanisms. However, the ejector rods of steeply sloped ejectors are usually quite slender, bearing enormous lateral forces during ejection, making them prone to bending, deformation, or even breakage, severely affecting demolding stability and mold lifespan. To address this, existing technologies commonly employ an auxiliary rod parallel to the main ejector rod to share the lateral force, enhancing the overall structural rigidity to ensure stable operation of the ejector. Simultaneously, these complex molds often require a complex demolding process with two openings. Before the ejector system operates, the mold's second mold plate needs to separate from the support plate (or ejector fixing plate) of the ejector system by a predetermined distance, creating a so-called "floating" effect to drive other mechanisms (such as the internal core-pulling slider) to complete the core-pulling action first.

[0004] The contradiction in existing technology lies in the fact that, to ensure support rigidity, the auxiliary rod of the inclined ejector is usually designed as a rigid connection. One end is linked to the inclined ejector seat located within the ejector system, while the other end is guided or fixedly connected to a component mounted on the second mold plate. This design is effective in traditional single-opening molds, but it creates irreconcilable structural interference in molds requiring secondary opening. When the second mold plate floats relative to the ejector system, this rigidly connected auxiliary rod is subjected to enormous tensile stress and cannot adapt to the relative displacement between the two. This can lead to minor issues like movement jamming and component wear, or even permanent deformation or breakage of the auxiliary rod or related components, ultimately resulting in mold damage and production stoppage. Therefore, how to enable the auxiliary support mechanism of the inclined ejector to provide reliable rigid support while also being compatible with the floating of the second mold plate during secondary opening is a technical problem that urgently needs to be solved in the current mold design field. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a slanted ejector auxiliary mechanism and its mold.

[0006] Firstly, a jacking auxiliary mechanism adopts the following technical solution:

[0007] A sloping ejector auxiliary mechanism is used to achieve demolding of injection molded parts with a large slope in a mold with a secondary mold opening function. The sloping ejector auxiliary mechanism includes a sloping ejector rod and an auxiliary rod arranged parallel to the sloping ejector rod. The sloping ejector auxiliary mechanism further includes:

[0008] An inclined top seat, wherein the lower end of the inclined top rod is movably supported inside the inclined top seat;

[0009] A fixed base, wherein the upper end of the auxiliary rod is rotatably inserted into the fixed base; and

[0010] The floating compensation component includes:

[0011] A slide block, wherein a linear guide groove is defined on the slide block; and

[0012] A sliding pin is fixed to the lower end of the auxiliary rod and slidably received in the guide groove to form a compensation mechanism that allows the auxiliary rod to make a preset linear floating displacement relative to the slide block.

[0013] Furthermore, the inclined top seat defines an internal cavity, and a guide groove is formed on the inner wall of the cavity; the sliding piece is slidably received in the guide groove; a first rotating block and a second rotating block are rotatably connected to the sliding piece; the lower end of the inclined top rod is non-rotatably coupled to the first rotating block, and the auxiliary rod passes through the second rotating block.

[0014] Furthermore, the fixing base includes a housing, on which a through hole for the auxiliary rod to pass through and a laterally positioned positioning pin are provided; the outer peripheral wall of the auxiliary rod is provided with an annular groove, which cooperates with the positioning pin, thereby allowing the auxiliary rod to rotate while axially positioning it.

[0015] Furthermore, the inclined top auxiliary mechanism also includes an inclined top block, which is locked to the upper end of the inclined top rod by a horizontally arranged connecting pin, wherein the upper end of the inclined top rod is inserted into the insertion hole of the inclined top block.

[0016] Furthermore, the middle section of the inclined push rod is fitted with an upper guide sleeve, a ring sleeve and a lower guide sleeve in sequence from top to bottom along its axial direction; a baffle is fixedly connected to the lower guide sleeve, and the baffle is configured to be fixedly connected with the second template of the mold.

[0017] Furthermore, the guide groove is a straight through groove, and the axial direction of the sliding pin is perpendicular to the axial direction of the auxiliary rod.

[0018] Furthermore, the inclined ejector is configured to be fixedly connected to the ejector pin system of the mold; the fixed seat is configured to be fixedly connected to the bottom of the second template of the mold; and the slide is configured to be fixedly connected to the base plate associated with the ejector pin system.

[0019] Secondly, a mold with a secondary mold-opening function adopts the following technical solution:

[0020] A mold with a secondary mold-opening function, the mold comprising:

[0021] A first template and a second template, the first template and the second template cooperate to define a mold cavity for molding injection parts, and can be opened and closed along the first parting surface;

[0022] A tray is configured to open and close twice with the second template along the second parting surface, so as to allow the second template to float relative to the tray during the mold opening process;

[0023] An ejector pin system, housed within the tray, is used to drive the angled ejector auxiliary mechanism to produce a demolding action; and

[0024] As described above, the inclined top auxiliary mechanism is used to perform inclined core pulling on the undercut feature of the injection molded part, while the floating compensation component is used to compensate for the floating displacement of the second template.

[0025] Furthermore, the fixed seat of the inclined top auxiliary mechanism is installed at the bottom of the second template, while the inclined top seat is installed on the ejector system, and the slide is installed on the base plate associated with the ejector system; during the secondary opening and closing process, when relative displacement occurs between the second template and the support plate, the floating compensation component compensates for the relative displacement by sliding the sliding pin in the guide groove.

[0026] Furthermore, the mold also includes:

[0027] A hydraulic cylinder configured to drive the ejector pin system to move relative to the tray;

[0028] The fastening mechanism has a base mounted on the ejector pin system. The fastening mechanism also includes a fastener and a fastener key. The fastener is mounted on the support plate, and the fastener key is mounted on the second template. The fastener has a groove, and the fastener key is configured to selectively engage and lock with the groove.

[0029] After the second template completes a preset floating displacement relative to the tray, the snap key engages and locks with the groove of the fastener to restrict further movement of the second template and allow the ejector system to continue to move independently under the drive of the hydraulic cylinder to drive the inclined ejector auxiliary mechanism.

[0030] The beneficial effects of this invention are:

[0031] The inclined ejector auxiliary mechanism provided by this invention, through a floating compensation component—specifically, a sliding fit structure between a sliding pin and a guide groove between the lower end of the auxiliary rod and the slide block—transforms the connection between the auxiliary rod and the ejector system components from a traditional rigid constraint to a controllable linear floating connection. This allows for precise compensation of relative displacement during secondary mold opening and when the second mold platen experiences floating displacement relative to the ejector system. The sliding of the pin within the groove effectively compensates for this relative displacement, thus completely eliminating the significant tensile stress caused by structural interference in existing technologies. Therefore, this invention not only fundamentally solves the structural compatibility problem of steep inclined ejectors in secondary mold opening molds, ensuring smooth and stable mold opening and ejection processes and eliminating jamming, but also effectively protects the auxiliary rod and related guide components from damage, significantly improving the reliability and service life of the entire mold. Simultaneously, this floating function is perfectly compatible with the inherent rigid support function of the auxiliary rod, ensuring stable and reliable lateral support for the steep inclined ejector during the final ejection stage, guaranteeing the quality of product demolding. It possesses extremely high practical value and promising prospects for widespread application. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the inclined plane auxiliary mechanism.

[0033] Figure 2 This is an assembly diagram of the inclined plane auxiliary mechanism.

[0034] Figure 3 This is a schematic diagram of the mold cross-section.

[0035] Figure 4 This is a schematic diagram of the mold structure.

[0036] Figure 5 This is a schematic diagram showing the coordination between the inclined top auxiliary mechanism and the injection molded part with a large slope.

[0037] Reference numerals: 100, sloping ejector auxiliary mechanism; 200, mold; 300, high-angle injection molded part;

[0038] 110. Inclined push rod; 111. Upper guide sleeve; 112. Ring sleeve; 113. Lower guide sleeve; 1131. Baffle plate; 120. Auxiliary rod; 121. Annular groove; 130. Inclined push seat; 131. Guide groove; 132. Sliding piece; 133. First rotating block; 134. Second rotating block; 140. Fixed seat; 141. Housing; 142. Positioning pin; 150. Floating compensation assembly; 151. Slide seat; 1511. Guide groove; 152. Sliding pin; 160. Inclined push block; 161. Connecting pin; 162. Insertion hole;

[0039] 210. Second template; 211. First parting surface; 220. Support plate; 221. Second parting surface; 230. Ejector system; 231. Base plate; 240. Hydraulic cylinder; 250. Fastener; 251. Base; 252. Fastener; 2521. Groove; 253. Key. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the present application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0041] In the following description, references to "some embodiments" refer to a subset of all possible embodiments; however, it is understood that "some embodiments" may be the same or different subsets of all possible embodiments and may be combined with each other without conflict. Unless otherwise defined, all technical and scientific terms used in the embodiments of the invention have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the invention pertain. The terminology used in the embodiments of the invention is for the purpose of describing the embodiments of the invention only and is not intended to limit the invention.

[0042] Those skilled in the art should understand that, in the following description of the embodiments of the present invention, the sequence of numbers does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0043] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0045] This embodiment provides a sloping ejector auxiliary mechanism 100 for demolding a high-slope injection molded part 300 in a mold 200 with a secondary mold opening function. The sloping ejector auxiliary mechanism 100 includes a sloping ejector rod 110 and an auxiliary rod 120 arranged parallel to the sloping ejector rod 110. The sloping ejector auxiliary mechanism 100 also includes:

[0046] The lower end of the inclined top seat 130 and the inclined top rod 110 are movably supported inside the inclined top seat 130;

[0047] The upper end of the auxiliary rod 120 is rotatably inserted into the fixed base 140; and

[0048] Floating compensation component 150 includes:

[0049] Slide 151, with a linear guide groove 1511 defined on slide 151; and

[0050] The sliding pin 152 is fixed to the lower end of the auxiliary rod 120 and slidably housed in the guide groove 1511 to form a compensation mechanism that allows the auxiliary rod 120 to make a preset linear floating displacement relative to the slide block 151.

[0051] In one specific embodiment, a sloping ejector auxiliary mechanism 100 is provided, designed for use in a complex injection mold 200 with a secondary mold opening function, to achieve reliable demolding of plastic parts with large slopes. For example... Figure 1-2 As shown, the core components of this mechanism include a main inclined ejector rod 110 and an auxiliary rod 120 arranged parallel to it. In order to achieve stable operation in the secondary mold 200, the mechanism is also provided with an inclined ejector seat 130, a fixed seat 140 and a floating compensation assembly 150.

[0052] In the specific structural implementation, both the angled ejector 110 and the auxiliary rod 120 are made of high-strength, wear-resistant tool steel to withstand enormous friction and stress. The angled ejector seat 130 is machined from pre-hardened mold steel 200 and is securely mounted on the ejector pin system 230 of the mold 200 by screws. It has an internal cavity to accommodate and guide the movement of the lower end of the angled ejector 110. The fixed seat 140 is also made of mold steel 200 and is mounted on the bottom of the second template 210 of the mold 200 by screws. Its core function is to provide a rotatable support point for the upper end of the auxiliary rod 120.

[0053] The inclined jack auxiliary mechanism 100 also includes a floating compensation assembly 150. This floating compensation assembly 150 includes a slide 151 and a sliding pin 152. The slide 151 is fixed to the base plate 231 associated with the ejector pin system 230 by screws. A precise, smooth, straight guide groove 1511 is formed on the slide 151 using a wire cutting process. The sliding pin 152 is a hardened cylindrical pin that passes laterally through the lower end of the auxiliary rod 120 and is securely fixed. After assembly, both ends of the sliding pin 152 can freely accommodate within the guide groove 1511.

[0054] With the above structure, when the mold 200 undergoes a second mold opening and the second template 210 floats relative to the support plate 220, the fixed seat 140 moves with the second template 210, while the slide block 151 remains fixed with the base plate 231 in the ejector system 230. The relative displacement between the two drives the auxiliary rod 120, causing its lower end sliding pin 152 to slide smoothly in the guide groove 1511 of the slide block 151. This design constitutes a simple and reliable linear displacement compensation mechanism, perfectly compensating for the floating stroke of the second template 210, thereby avoiding tensile or compressive stress on the auxiliary rod 120, preventing structural interference and damage, ensuring smooth secondary mold opening and long-term stable operation of the mold 200.

[0055] In some embodiments, the inclined top seat 130 defines an internal cavity, and a guide groove 131 is provided on the inner wall of the cavity; the sliding piece 132 is slidably received in the guide groove 131; a first rotating block 133 and a second rotating block 134 are rotatably connected to the sliding piece 132; the lower end of the inclined top rod 110 is non-rotatably coupled to the first rotating block 133, and the auxiliary rod 120 passes through the second rotating block 134.

[0056] Based on the above specific embodiments, the inclined top seat 130 is precision cast or integrally machined, and its interior defines an internal cavity. On the opposing inner walls of the cavity, a pair of parallel guide grooves 131 are formed by milling or electrical discharge machining. The sliding piece 132 is placed in the guide groove 131 to form a sliding fit, with the tolerance controlled between 0.01-0.02 mm to ensure that it can only move stably along the direction of the guide groove 131.

[0057] Two independent rotating blocks, namely the first rotating block 133 and the second rotating block 134, are rotatably mounted on the sliding plate 132 via pins. The first rotating block 133 has a non-circular hole (e.g., a T-slot or a hole with a keyway), and the lower end of the inclined push rod 110 is correspondingly machined into a T-shaped head or a keyed shaft end. The two work together to form a non-rotational torque transmission coupling. The second rotating block 134 has a smooth circular hole through which the body of the auxiliary rod 120 passes directly, forming a pivot connection.

[0058] Through the aforementioned internal structure, the inclined ejector seat 130 is not only a simple support base, but also a motion conversion mechanism. The movement of the sliding plate 132 within the guide groove 131 provides a stable, non-laterally swaying linear guide for the ejection and resetting of the entire inclined ejector mechanism. The two rotatable pivot blocks allow the inclined ejector rod 110 and auxiliary rod 120 to freely change their tilt angles during ejection, thereby smoothly and with low resistance converting the purely vertical thrust of the ejector system 230 into the oblique ejection motion required by the inclined ejector rod 110, greatly reducing internal stress and wear during the motion process.

[0059] In some embodiments, the fixing base 140 includes a housing 141, which has a through hole for the auxiliary rod 120 to pass through and a laterally arranged positioning pin 142. The outer peripheral wall of the auxiliary rod 120 is provided with an annular groove 121, which cooperates with the positioning pin 142 to axially position the auxiliary rod 120 while allowing it to rotate.

[0060] In one specific embodiment, the fixing base 140 is a block-shaped housing 141 machined from 200 steel. A vertical through hole is machined into the housing 141 using drilling and reaming processes. The inner diameter of the through hole is slightly larger than the outer diameter of the auxiliary rod 120, allowing the auxiliary rod 120 to rotate freely through it. A locating pin 142 hole is drilled laterally in the middle of this through hole. A hardened locating pin 142 is pressed into or locked with a screw in this hole, with a portion extending into the vertical through hole.

[0061] Correspondingly, a precise annular groove 121 is machined into the outer peripheral wall of the auxiliary rod 120. The width of this groove is slightly larger than the diameter of the locating pin 142, and the depth is moderate. During assembly, the auxiliary rod 120 passes through the through hole, so that the annular groove 121 is precisely aligned with the position of the locating pin 142.

[0062] The aforementioned pin-groove fit structure, where the upper and lower groove walls of the slot cooperate with the positioning pin 142, provides reliable axial positioning for the auxiliary rod 120, preventing it from moving up and down relative to the fixed seat 140 (i.e., the second template 210). This design, with its simplest structure, ensures the positional accuracy of the auxiliary rod 120 when providing guiding support.

[0063] In some embodiments, the inclined top auxiliary mechanism 100 further includes an inclined top block 160, which is locked to the upper end of the inclined top rod 110 by a horizontally arranged connecting pin 161, wherein the upper end of the inclined top rod 110 is inserted into the insertion hole 162 of the inclined top block 160.

[0064] In one specific embodiment, the inclined ejector auxiliary mechanism 100 further includes an inclined ejector block 160, which is a functional component that directly contacts the injection molded part and forms its undercut surface. Its shape is precisely machined according to the product drawings using methods such as five-axis CNC. The upper end of the inclined ejector rod 110 is machined into a cylindrical shape and inserted into the pre-drilled insertion hole 162 in the inclined ejector block 160.

[0065] To securely lock the two together, a through pin hole is drilled laterally on the side of the jack 160, which also passes through the upper end of the inserted jack 110. Then, a high-strength connecting pin 161 (typically a flexible cylindrical pin or a shouldered solid pin) is hammered into or locked into the lateral pin hole.

[0066] This lateral locking method via connecting pin 161 is a very mature and reliable connection technology in mold 200. It not only transmits enormous ejection force and friction, ensuring absolute synchronization and integrity of the angled ejector pin 110 and angled ejector block 160 during operation, but it is also a detachable connection. When maintenance or replacement of the angled ejector block 160 / angled ejector pin 110 is required, the two can be easily separated simply by pulling out the connecting pin 161, greatly improving the maintainability of mold 200 and reducing maintenance costs and time.

[0067] In some embodiments, the middle section of the inclined push rod 110 is provided with an upper guide sleeve 111, a ring sleeve 112 and a lower guide sleeve 113 sequentially from top to bottom along its axial direction; a baffle 1131 is fixedly connected to the lower guide sleeve 113, and the baffle 1131 is configured to be fixedly connected with the second template 210 of the mold 200.

[0068] In one specific embodiment, along the axial direction of the inclined push rod 110, which needs to penetrate the middle section of the second template 210, three key sleeve-like parts are arranged sequentially from top to bottom: upper guide sleeve 111, ring sleeve 112, and lower guide sleeve 113. The upper and lower guide sleeves 113 are typically made of a highly wear-resistant, self-lubricating material, and their inner holes mate with the inclined push rod 110, playing a major sliding guiding role. The ring sleeve 112 acts as a spacer ring, precisely controlling the distance between the upper and lower guide sleeves 113.

[0069] A baffle plate 1131 is connected to the outer edge of the lower guide sleeve 113 by welding, screwing, or integral machining. The baffle plate 1131 is a flange structure with screw holes. During the assembly of the mold 200, the upper and lower guide sleeves 113 and the ring sleeve 112 are placed into the through hole of the second template 210 together with the inclined push rod 110, and then the baffle plate 1131 is firmly locked to the bottom surface of the second template 210 by fastening screws.

[0070] This multi-component guide structure provides segmented, precise, and stable support for the slender angled ejector rod 110. The upper and lower guide sleeves work together to increase the guide length, effectively resisting the bending deformation of the angled ejector rod 110 under stress and ensuring the accuracy of its movement trajectory, which is crucial for the surface quality of the final molded part. Furthermore, the entire guide sleeve assembly is fixed from one side of the second mold plate 210 by the baffle 1131, ensuring not only a secure and reliable installation but also convenient disassembly and maintenance, eliminating the need for complex operations from inside the mold 200.

[0071] In some embodiments, the guide groove 1511 is a straight through groove, and the axial direction of the sliding pin 152 is perpendicular to the axial direction of the auxiliary rod 120.

[0072] In some embodiments, the inclined ejector 130 is configured to be fixedly connected to the ejector system 230 of the mold 200; the fixed seat 140 is configured to be fixedly connected to the bottom of the second template 210 of the mold 200; and the slide 151 is configured to be fixedly connected to the base plate 231 associated with the ejector system 230.

[0073] In a preferred embodiment, the guide groove 1511 in the floating compensation assembly 150 is machined into a straight through groove, which can be completed in one step using a milling process, and is easy to clean and inspect. Meanwhile, the installation direction of the sliding pin 152 is set to be strictly perpendicular to the axis of the auxiliary rod 120, which is standard engineering practice for achieving the most efficient and lowest-resistance linear sliding.

[0074] In the overall layout of the mold 200, the installation positions of each component are clearly defined: the inclined ejector seat 130 is configured to be fixedly connected to the ejector system 230 (specifically the ejector panel) of the mold 200; the fixed seat 140 is configured to be fixedly connected to the bottom of the second template 210 of the mold 200; and the slide 151 is configured to be fixedly connected to the base plate 231 (i.e., the ejector base plate 231) associated with the ejector system 230.

[0075] The through-slot design reduces the manufacturing cost and difficulty of the slide 151. Furthermore, the strict definition of the installation positions of each component clearly reveals the working principle of the invention structurally: the movement of the second template 210 (via the fixed seat 140) is separate from the movement of the ejector system 230 / base plate 231 (via the inclined ejector seat 130 and the slide 151), thus highlighting the necessity of setting up the floating compensation component 150, making the technical solution of the invention clear and logically complete.

[0076] This embodiment provides a mold 200 with a secondary mold opening function. The mold 200 includes:

[0077] The first template and the second template 210 cooperate to define the mold cavity for molding the injection molded part, and can be opened and closed along the first parting surface 211;

[0078] The pallet 220 is configured to open and close twice with the second template 210 along the second parting surface 221, so as to allow the second template 210 to float relative to the pallet 220 during the mold opening process.

[0079] Ejector system 230, housed within tray 220, and used to drive angled ejector auxiliary mechanism 100 to generate a demolding action; and

[0080] As mentioned above, the inclined top auxiliary mechanism 100 is used to perform inclined core pulling on the undercut feature of the injection molded part, while the floating compensation component 150 is used to compensate for the floating displacement of the second template 210.

[0081] In some embodiments, the fixed seat 140 of the inclined top auxiliary mechanism 100 is installed at the bottom of the second template 210, while the inclined top seat 130 is installed on the ejector system 230, and the slide 151 is installed on the base plate 231 associated with the ejector system 230. During the secondary opening and closing process, when a relative displacement occurs between the second template 210 and the support plate 220, the floating compensation component 150 compensates for the relative displacement by sliding the sliding pin 152 in the guide groove 1511.

[0082] In one specific embodiment, the aforementioned inclined ejector auxiliary mechanism 100 is placed within a complete mold 200 with secondary mold opening function. For example... Figure 3-5 As shown, the mold 200 includes:

[0083] First mold plate and second mold plate 210: their mating surfaces define the mold cavity for molding the final injection molded part. Both can be opened and closed along the first parting surface 211 (PL1).

[0084] Support plate 220: Located behind the second template 210, it supports the entire ejector system 230. The support plate 220 and the second template 210 define a second parting surface 221 (PL2). During mold opening, the second template 210 will first separate from the support plate 220 along PL2 by a certain distance, resulting in floating displacement.

[0085] Ejector system 230: It is housed in the tray 220 and includes ejector panel, ejector base plate 231, etc. Its main function is to continue moving forward after the second template 210 floats into place, driving all ejection elements, including the inclined ejector auxiliary mechanism 100, to produce demolding action.

[0086] In actual operation, when the mold opening action begins, the second template 210 and the support plate 220 first separate along PL2. At this time, since the fixed seat 140 is installed at the bottom of the second template 210, and the inclined ejector seat 130 and the slide 151 are both installed on the ejector system 230 or its associated base plate 231, the floating displacement of the second template 210 causes relative movement between the fixed seat 140 and the slide 151. At this time, the floating compensation component 150 starts to work, and the sliding pin 152 of the auxiliary rod 120 slides in the guide groove 1511, perfectly compensating for this relative displacement.

[0087] By combining the inclined ejector auxiliary mechanism 100 with the secondary mold opening mold 200 structure, a complete and collaborative technical solution is constructed. This mold 200 can reliably realize the complex action sequence of "first secondary mold opening, then driving other mechanisms to eject and demold", while the inclined ejector auxiliary mechanism 100 can adapt to the floating of the second template 210 throughout the entire process and provide stable support during the final ejection, thereby enabling the stable and efficient production of complex plastic parts with large-angle undercuts that were previously difficult to process.

[0088] In some embodiments, the mold 200 further includes:

[0089] Hydraulic cylinder 240, configured to drive the ejector pin system 230 to move relative to the tray 220;

[0090] The fastener 250 has a base 251 mounted on the ejector system 230. The fastener 250 also includes a fastener 252 and a snap button 253. The fastener 252 is mounted on the support plate 220, and the snap button 253 is mounted on the second template 210. The fastener 252 has a groove 2521, and the snap button 253 is configured to selectively engage and lock with the groove 2521.

[0091] After the second template 210 completes a preset floating displacement relative to the support plate 220, the snap key 253 engages and locks with the groove 2521 of the fastener 252 to restrict further movement of the second template 210 and allow the ejector system 230 to continue to move independently under the drive of the hydraulic cylinder 240 to drive the inclined ejector auxiliary mechanism 100.

[0092] In one specific embodiment, this embodiment provides a locking mechanism for driving and controlling secondary mold opening. This mechanism includes a hydraulic cylinder 240 and a latching system 250.

[0093] Hydraulic cylinder 240: Its cylinder body is fixed on the base plate 231 or support plate 220 of mold 200, and the piston rod is connected to the ejector base plate 231 of ejector system 230. Hydraulic cylinder 240 is configured as a power source to drive the entire ejector system 230 to reciprocate relative to support plate 220 through hydraulic pressure.

[0094] Locking mechanism 250: A mechanical locking device mainly composed of three parts, including:

[0095] Key 253: Typically an oval, T-shaped or L-shaped steel lock block that has been hardened by quenching, and is installed on the side or bottom of the second template 210 by screws.

[0096] Fastener 252: A hardened, wear-resistant steel block with a groove 2521, which is machined to match the shape of the key 253, by grinding or wire cutting. The fastener 252 is securely mounted on the stationary support plate 220.

[0097] 250 base 251: The base 251, which carries the internal spring or lever reset / unlock mechanism, is mounted on the movable ejector pin system 230.

[0098] During the secondary mold opening process, the hydraulic cylinder 240 is activated, driving the ejector system 230 (including the latching mechanism 250 base 251 on it) to move upward relative to the support plate 220. This causes the second template 210 to initially float, and the latching key 253 installed on the second template 210 will move precisely to the position aligned with the groove 2521 of the fastener 252 installed on the support plate 220, and engage and lock with it. This locking action is a lock between the second template 210 and the support plate 220, meaning that the floating stroke of the second template 210 ends and its position is temporarily fixed. Once locked, the hydraulic cylinder 240 can be activated, driving the ejector system 230 to operate independently and complete the subsequent ejection action. When the mold 200 is reset, the retracted latching mechanism 250 base 251 will push the latching key 253 out of the fastener 252 through its inclined surface or lever, completing the unlocking.

[0099] The linkage locking mechanism employed in this invention, consisting of a snap button 253, a fastener 252, and a base 251 for the locking mechanism 250, possesses significant technical advantages. First, it achieves an extremely precise and stable "hard stop" by directly mechanically locking the second template 210 to the stationary support plate 220, ensuring extremely high repeatability of the floating distance during secondary mold opening. Second, this structure greatly enhances the system's rigidity. During the subsequent movement of the ejector system 230, the firmly locked second template 210 provides an absolutely stable platform, preventing any unnecessary vibrations and thus ensuring the smooth movement of components such as the angled ejector.

[0100] Working principle of the invention

[0101] The working principle and action sequence of the inclined ejector auxiliary mechanism 100 and the mold 200 using it disclosed in this invention can be explained through a complete injection molding and mold opening cycle. The specific steps are as follows:

[0102] Phase 1: Mold Closure and Injection Molding

[0103] In its initial state, mold 200 is tightly closed at the first parting surface 211 (PL1) with the first mold plate 210 and the support plate 220 at the second parting surface 221 (PL2). At this time, the first and second mold plates 210 of mold 200 together define a complete mold cavity. Molten plastic is injected into the mold cavity through an injection molding machine, filling and cooling to solidify, forming a final plastic part with a large-angle undercut feature. During this stage, the inclined ejector auxiliary mechanism 100 remains stationary, and its inclined ejector block 160 forms part of the mold cavity.

[0104] Phase Two: Initial Mold Design (PL1 Mold Design)

[0105] After injection molding and cooling, the injection molding machine drives the mold 200 to open along the first parting surface 211 (PL1), that is, the first mold plate and the second mold plate 210 separate. Due to the shrinkage and clamping force of the plastic part and the presence of the undercut feature, the plastic part will reliably remain on the second mold plate 210 side and move with it.

[0106] Phase 3: Secondary mold opening (PL2 mold opening), second template 210 floating and locking

[0107] This is a crucial stage in realizing the core function of this invention, and its internal action sequence is as follows:

[0108] Initial floating: When the mold 200 opens along PL1, the hydraulic cylinder 240 is activated, and its piston rod begins to push the ejector system 230 (including the ejector plate and ejector base plate 231) upward. The second template 210 begins to move forward relative to the stationary support plate 220, generating an initial floating displacement.

[0109] Snap-fit ​​locking: When the floating displacement of the second template 210 reaches a preset value (e.g., 30mm), the snap key 253 mounted on it also moves precisely to the groove 2521 of the fastener 252 and snaps into place instantly. This locking action means that the floating stroke of the second template 210 ends, and its position is temporarily fixed. This relative displacement will cause the auxiliary rod 120 to be pulled, and the sliding pin 152 at its lower end will slide smoothly in the guide groove 1511 of the slide block 151. This sliding stroke precisely compensates for the movement of the ejector pin system 230, thereby preventing the auxiliary rod 120 from being subjected to any tensile or compressive stress.

[0110] Phase 4: Ejection and Demolding

[0111] Simultaneously with the floating compensation, the ejector system 230 continues to move independently under the continuous push of the hydraulic cylinder 240. The angled ejector seat 130 mounted on the ejector system 230 is pushed, and through its internal mechanism, the vertical thrust is converted into the angled ejection motion of the angled ejector rod 110. The angled ejector rod 110, together with the angled ejector block 160 at its upper end, moves upward and laterally, smoothly pushing out the undercut feature of the plastic part. During this process, the auxiliary rod 120 always provides parallel and stable lateral support for the angled ejector rod 110.

[0112] Phase 5: Reset

[0113] After the plastic part is removed, the hydraulic cylinder 240 moves in the reverse direction, driving the ejector system 230 to reset backward. At a certain point during the reset, the unlocking mechanism on the latch 250 is triggered, causing the latch 253 to disengage from the groove 2521. Subsequently, the ejector system 230 continues to retract, pushing the second mold plate 210 back along with it until the second parting surface 221 (PL2) closes. Finally, the first mold plate and the second mold plate 210 close at the first parting surface 211 (PL1), and the entire mold 200 returns to its initial state.

[0114] In summary, the present invention perfectly solves the structural contradiction between the floating of the second template 210 and the rigid support of the large-angle inclined top during the secondary mold opening by using the floating compensation component 150, and realizes a fully automatic and high-precision complex demolding process through the timing coordination of the hydraulic cylinder 240 and the buckle 250.

[0115] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sloping ejector auxiliary mechanism for demolding large-slope injection molded parts in a mold with a secondary mold opening function, the sloping ejector auxiliary mechanism comprising a sloping ejector rod and an auxiliary rod arranged parallel to the sloping ejector rod, characterized in that, The inclined jack auxiliary mechanism also includes: An inclined top seat, wherein the lower end of the inclined top rod is movably supported inside the inclined top seat; A fixed base, wherein the upper end of the auxiliary rod is rotatably inserted into the fixed base; and The floating compensation component includes: A slide block, wherein a linear guide groove is defined on the slide block; and A sliding pin is fixed to the lower end of the auxiliary rod and slidably received in the guide groove to form a compensation mechanism that allows the auxiliary rod to make a preset linear floating displacement relative to the slide block.

2. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The inclined top seat defines an internal cavity, and a guide groove is formed on the inner wall of the cavity; the sliding piece is slidably received in the guide groove; a first rotating block and a second rotating block are rotatably connected to the sliding piece; the lower end of the inclined top rod is non-rotatably coupled to the first rotating block, and the auxiliary rod passes through the second rotating block.

3. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The fixing base includes a housing, on which a through hole for the auxiliary rod to pass through and a laterally positioned positioning pin are provided; the outer peripheral wall of the auxiliary rod is provided with an annular groove, which cooperates with the positioning pin, thereby allowing the auxiliary rod to rotate while axially positioning it.

4. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The inclined jacking auxiliary mechanism also includes an inclined jacking block, which is locked to the upper end of the inclined jacking rod by a horizontally arranged connecting pin, wherein the upper end of the inclined jacking rod is inserted into the insertion hole of the inclined jacking block.

5. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The middle section of the inclined push rod is fitted with an upper guide sleeve, a ring sleeve and a lower guide sleeve in sequence from top to bottom along its axial direction; a baffle is fixedly connected to the lower guide sleeve, and the baffle is configured to be fixedly connected with the second template of the mold.

6. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The guide groove is a straight through groove, and the axis of the sliding pin is perpendicular to the axis of the auxiliary rod.

7. The inclined jacking auxiliary mechanism according to claim 1, characterized in that, The inclined ejector is configured to be fixedly connected to the ejector system of the mold; the fixed seat is configured to be fixedly connected to the bottom of the second template of the mold; and the slide is configured to be fixedly connected to the base plate associated with the ejector system.

8. A mold with a secondary mold-opening function, characterized in that, The mold includes: A first template and a second template, the first template and the second template cooperate to define a mold cavity for molding injection parts, and can be opened and closed along the first parting surface; A tray is configured to open and close twice with the second template along the second parting surface, so as to allow the second template to float relative to the tray during the mold opening process; An ejector pin system, housed within the tray, is used to drive the angled ejector auxiliary mechanism to produce a demolding action; and The inclined top auxiliary mechanism as described in any one of claims 1 to 7 is used to perform inclined core pulling on the undercut feature of the injection molded part, while the floating compensation component is used to compensate for the floating displacement of the second template.

9. The mold according to claim 8, characterized in that, The fixed seat of the inclined top auxiliary mechanism is installed at the bottom of the second template, while the inclined top seat is installed on the ejector system, and the slide is installed on the base plate associated with the ejector system; during the secondary opening and closing process, when relative displacement occurs between the second template and the support plate, the floating compensation component compensates for the relative displacement by sliding the sliding pin in the guide groove.

10. The mold according to claim 8 or 9, characterized in that, The mold also includes: A hydraulic cylinder configured to drive the ejector pin system to move relative to the tray; The fastening mechanism has a base mounted on the ejector pin system. The fastening mechanism also includes a fastener and a fastener key. The fastener is mounted on the support plate, and the fastener key is mounted on the second template. The fastener has a groove, and the fastener key is configured to selectively engage and lock with the groove. After the second template completes a preset floating displacement relative to the tray, the snap key engages and locks with the groove of the fastener to restrict further movement of the second template and allow the ejector system to continue to move independently under the drive of the hydraulic cylinder to drive the inclined ejector auxiliary mechanism.

Images