Tilt-up mechanism and mold therefor

Abstract

The utility model belongs to injection mold technical field especially relates to a kind of inclined ejector mechanism and its mould.A kind of inclined ejector mechanism is applied to the mould with secondary mold opening function, for the internal undercut structure of plastic part is demoulded, comprising: straight ejector rod, configuration is used to receive the linear drive force of mould ejector pin plate mechanism;Inclined ejector rod, its axis and the straight ejector rod present preset angle;Guide sleeve, the straight guide hole and the inclined guide hole that are interconnected are equipped in the guide sleeve, respectively for the sliding direction of the straight ejector rod and inclined ejector rod is guided;And transmission cooperation structure, the transmission cooperation structure is set between the straight ejector rod and inclined ejector rod, and is constrained by the guide sleeve, to the straight ejector rod is converted into the oblique movement along its own axial direction along vertical straight line movement.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and in particular relates to a slanted ejector mechanism and its mold. Background Technology

[0002] In modern industrial manufacturing, injection molding is one of the most important methods for producing plastic products. For complex plastic parts, especially automotive interior parts and appliance housings, there are often internal grooves or protrusions that hinder direct demolding—these are internal undercut structures. To ensure smooth demolding of these plastic parts with internal undercuts, a slanted ejector mechanism is typically used in mold design. Traditional slanted ejector mechanisms, during ejection, achieve lateral core pulling while completing the ejection action, thus completing the demolding of the undercut. However, when the undercut angle is large or the demolding stroke is long, ordinary slanted ejector mechanisms cannot guarantee the stability of their movement. Therefore, the industry often uses a large-angle slanted ejector structure with an auxiliary guide rod. This adds a guide rod parallel to the slanted ejector rod to strengthen the guidance during movement, preventing wobbling or jamming.

[0003] As product structures become increasingly complex, a single mold opening action is no longer sufficient to meet demolding requirements, leading to the development of molds with secondary mold opening functions. These molds typically utilize the floating of the B-plate (secondary mold plate) to complete part of the core-pulling or demolding action before the overall product ejection. However, when the aforementioned large-angle inclined ejector structure with auxiliary guide rods is applied to such secondary mold opening molds, serious design flaws become apparent. During the secondary mold opening process, the B-plate fixing the inclined ejector mechanism separates significantly from the ejector plate system. This easily causes the auxiliary rods, which serve as guides, to completely detach from their guide holes in the ejector plate system, resulting in a "derailment" phenomenon. Once the auxiliary guide rods fail, the inclined ejector mechanism loses its stability constraint during subsequent ejection movements, easily leading to vibration, tilting, or even jamming. This severely impacts production stability and product yield, and may even damage the mold itself.

[0004] Therefore, those skilled in the art urgently need to develop a tilting ejector mechanism that can operate stably and reliably in secondary mold opening molds with a floating B-plate. Specifically, the core technical problem this mechanism needs to solve is how to provide a structure that is unaffected by the relative separation of the B-plate and ejector plate system under the requirement of large-angle tilting ejection, and can maintain guiding and stable movement throughout the entire mold opening and ejection process. This would completely avoid the series of problems caused by the "derailment" of traditional auxiliary guide rods due to secondary mold opening, and ensure that complex plastic parts can be safely and reliably demolded. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned shortcomings by providing a slanted ejector mechanism and its mold.

[0006] Firstly, a tilting mechanism employs the following technical solution:

[0007] A slanted ejector mechanism, applied to a mold with a secondary mold opening function, is used for demolding the internal undercut structure of a plastic part, comprising:

[0008] A straight push rod is configured to receive the linear driving force of the mold ejector plate mechanism;

[0009] The inclined push rod has its axis forming a predetermined angle with the straight push rod;

[0010] A guide sleeve, wherein the guide sleeve is provided with a straight guide hole and an oblique guide hole that are interconnected, for sliding guidance of the straight push rod and the oblique push rod, respectively;

[0011] The transmission mechanism is provided between the straight push rod and the inclined push rod and is constrained by the guide sleeve, so as to convert the vertical linear movement of the straight push rod into the oblique movement of the inclined push rod along its own axis.

[0012] Furthermore, the transmission engagement structure includes:

[0013] The helical teeth integrally formed on the straight push rod body; and

[0014] An inclined groove integrally formed on the inclined top rod body and meshing with the inclined teeth.

[0015] Furthermore, the straight push rod has a non-circular cross-section, and the straight guide hole has an inner contour that matches the non-circular cross-section to limit the rotation of the straight push rod during movement.

[0016] Furthermore, the top end of the inclined push rod is connected to an inclined push block for forming the internal inverted structure, and the inclined push block and the inclined push rod are fixed together by a fixing pin.

[0017] Furthermore, the guide sleeve is also provided with screw holes for installing and fixing the guide sleeve into the second template of the mold using fasteners.

[0018] Furthermore, the bottom end of the straight push rod is fixedly connected to the ejector plate mechanism of the mold.

[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 including the aforementioned inclined ejector mechanism.

[0021] Furthermore, the mold also includes:

[0022] A first template and a second template, the first template and the second template cooperate to define a mold cavity for molding plastic parts, and can be opened and closed along the first parting surface;

[0023] A tray, configured to open and close twice with the second template along a second parting surface, to allow the second template to float relative to the tray during mold opening; and

[0024] An ejector plate mechanism is housed within the support plate. The ejector plate mechanism includes an ejector base plate and an ejector panel. The ejector panel is configured to move independently relative to the ejector base plate after the second template has completed its floating displacement.

[0025] The guide sleeve of the inclined ejector mechanism is fixed in the second template, and the straight ejector rod is connected to the ejector plate in the ejector plate mechanism. After the second template completes its floating displacement, the ejector plate in the ejector plate mechanism continues to drive the inclined ejector mechanism to eject the plastic part.

[0026] Furthermore, the mold also includes:

[0027] A hydraulic cylinder configured to drive the ejector plate mechanism to move relative to the support plate; the hydraulic cylinder includes a cylinder body and a telescopic rod, the cylinder body being fixedly connected to the support plate, and the telescopic rod being fixedly connected to the ejector plate mechanism, and is configured to drive the ejector base plate to move together with the ejector panel; and is also configured to drive only the ejector panel to move; and

[0028] The fastening mechanism includes a base, a fastener, and a fastener key. The base is mounted on the ejector base plate of the ejector plate mechanism, 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] Wherein, after the second template completes the floating displacement relative to the support plate, the snap key engages and locks with the groove of the fastener to restrict further movement of the second template; the hydraulic cylinder only drives the ejector plate to drive the inclined ejector mechanism.

[0030] Furthermore, the mold also includes a slider mechanism, the driving force of which comes from the floating process of the second template relative to the support plate to realize the first stage of inner core pulling movement; after the first stage of core pulling is completed, the inclined ejector mechanism performs the second stage of demolding movement of the plastic part.

[0031] The beneficial effects of this utility model are:

[0032] The inclined ejector mechanism provided by this invention fundamentally eliminates the external auxiliary guide rod structure relied upon by traditional large-angle inclined ejectors by employing a straight ejector rod, an inclined ejector rod, a guide sleeve that constrains and links the two, and an internal transmission mechanism. This inclined ejector mechanism allows all guiding and motion conversion of the inclined ejector to be completed within the compact guide sleeve. Its motion stability is no longer affected by the relative separation of the B-plate and ejector plate system during the secondary mold opening process, thus completely solving the technical pain point of auxiliary guide rod failure due to "derailment" in existing technologies. The inclined ejector mechanism of this invention exhibits precise movement and stable and reliable operation throughout the entire demolding process, ensuring excellent guiding performance even under large stroke conditions during secondary mold opening. This improves the production qualification rate of complex plastic parts and the service life of molds, demonstrating significant practical value and promising prospects for widespread application. Attached Figure Description

[0033] Figure 1 This is the front view of the inclined top mechanism.

[0034] Figure 2 This is a side view of the inclined top mechanism.

[0035] Figure 3 Isometric drawing of the inclined jack mechanism.

[0036] Figure 4 This is a schematic diagram of a straight push rod structure.

[0037] Figure 5 This is a schematic diagram of the inclined top rod structure.

[0038] Figure 6 This is a schematic diagram of the guide sleeve structure.

[0039] Figure 7 This is an isometric drawing of the mold.

[0040] Figure 8 This is the main view of the mold.

[0041] Figure 9 This is a side view of the mold.

[0042] Figure 10 This is an isometric schematic diagram showing the positional relationships of the various mechanisms in the mold.

[0043] Figure 11 This is a front view schematic diagram showing the positional relationship of the various mechanisms in the mold.

[0044] Reference numerals: 100, slanted ejector mechanism; 200, mold; 300, plastic part;

[0045] 110. Straight push rod; 120. Angled push rod; 130. Guide sleeve; 131. Straight guide hole; 132. Angled guide hole; 133. Screw hole; 134. Fastener; 140. Transmission mating structure; 141. Helical tooth; 142. Angled groove; 150. Angled push block;

[0046] 210. Second template; 211. First parting surface; 220. Support plate; 221. Second parting surface; 230. Ejector plate mechanism; 231. Ejector base plate; 232. Ejector panel; 240. Hydraulic cylinder; 241. Cylinder body; 242. Telescopic rod; 250. Fastener; 251. Base; 252. Fastener; 2521. Groove; 253. Key; 260. Slider mechanism; 270. Base plate. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model 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 this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] 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 this utility model have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this utility model belong. The terminology used in the embodiments of this utility model is for the purpose of describing the embodiments of this utility model only and is not intended to limit the utility model.

[0049] Those skilled in the art should understand that, in the following description of the embodiments of this utility model, 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 this utility model.

[0050] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The singular forms "a" and "the" as used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0051] This embodiment provides a sloping top mechanism 100, such as... Figures 1 to 6As shown. The inclined ejector mechanism 100 is used in the mold 200 with a secondary mold opening function. Its core function is to solve the demolding problem of the undercut structure inside the plastic part 300 after molding.

[0052] Reference Figures 1 to 3 The inclined push mechanism 100 includes a straight push rod 110, an inclined push rod 120, a guide sleeve 130, and a transmission and engagement structure 140.

[0053] Straight push rod 110 (e.g.) Figure 4 The figure shown is a long, slender rod with its bottom configured to connect to the ejector plate mechanism 230 (specifically, the ejector panel 232) of the mold 200, thereby receiving a linear driving force from the ejector plate mechanism 230. In this embodiment, the direction of the driving force is vertical.

[0054] 120 angled push rod (e.g.) Figure 5 As shown, it is also a slender rod, which is inclined in the mold 200, and its axis forms a preset angle with the axis (i.e., the vertical direction) of the straight ejector rod 110. This angle is set according to the depth and angle of the undercut of the plastic part 300.

[0055] Guide sleeve 130 (e.g.) Figure 6 As a key constraint and guide component, it has two interconnected through holes integrally formed inside: a straight guide hole 131 and an angled guide hole 132. The shape and size of the straight guide hole 131 match the straight push rod 110 to accommodate it and guide its vertical movement. Similarly, the angled guide hole 132 matches the angled push rod 120 to guide it along its own inclined axis. The two guide holes are connected to ensure that the straight push rod 110 and the angled push rod 120 installed therein can engage in a transmission process.

[0056] The transmission and engagement structure 140 is the core structure for realizing the motion conversion between the straight ejector rod 110 and the inclined ejector rod 120. It is located between the straight ejector rod 110 and the inclined ejector rod 120, and the entire transmission process occurs within the constraint of the guide sleeve 130. Its function is to convert the vertical linear motion input by the straight ejector rod 110 into the oblique motion of the inclined ejector rod 120 along its own axis, thereby realizing the demolding of the undercut.

[0057] The above-described structure of "straight ejector rod - angled ejector rod - guide sleeve - transmission structure" provides a compact and stable angled ejector solution that does not rely on traditional auxiliary guide rods. This fundamentally avoids the guide failure (derailment) problem that may occur due to template separation during the secondary mold opening process, and is particularly suitable for angled ejector applications with large stroke and large angle.

[0058] In some specific embodiments, reference is made to Figure 4 and Figure 5 In this embodiment, the transmission engagement structure 140 consists of a helical tooth 141 integrally formed on one side of the straight push rod 110, and a helical groove 142 integrally formed on the inclined push rod 120 and meshing with the helical tooth 141. The tooth profile, angle, and pitch of the helical tooth 141 and the helical groove 142 are precisely matched. When the straight push rod 110 moves vertically upward, the helical tooth 141 pushes the groove wall of the helical groove 142, thereby driving the inclined push rod 120 to produce an oblique movement.

[0059] In some specific embodiments, in order to ensure that the helical teeth 141 and the helical groove 142 can achieve inclined surface pushing rather than helical transmission, the cross-section of the straight push rod 110 is non-circular, such as a D-shaped cross-section or a square cross-section with a chamfered surface. Correspondingly, the straight guide hole 131 in the guide sleeve 130 also has an inner contour that matches the non-circular cross-section.

[0060] This non-circular fit prevents the straight ejector rod 110 from rotating around its own axis when moving within the straight guide hole 131. This anti-rotation function is key to achieving stable demolding, ensuring that the vertical movement of the straight ejector rod 110 can be converted into the linear oblique movement of the inclined ejector rod 120, avoiding the uncertainty and jamming risk caused by rotation.

[0061] In some specific embodiments, reference is made to Figures 1 to 3 An inclined ejector rod 120 has an inclined ejector block 150 connected to its top end. The top surface of the inclined ejector block 150 actually participates in molding the internal undercut structure of the plastic part 300. The inclined ejector block 150 and the inclined ejector rod 120 are fixed together by a fixing pin. Designing the inclined ejector block 150 and the inclined ejector rod 120 as separate structures and connecting them with a fixing pin facilitates manufacturing and allows for easy replacement of the inclined ejector block when it wears out, reducing maintenance costs.

[0062] In some specific embodiments, reference is made to Figure 3 and Figure 6 In order to reliably fix the entire inclined ejector mechanism 100 inside the second template 210 of the mold 200, screw holes 133 are also provided on the guide sleeve 130. By passing fasteners 134 (such as screws) through the screw holes 133, the guide sleeve 130 can be firmly installed in the preset position of the second template 210.

[0063] As described above, the bottom end of the straight push rod 110 is the power input end of the entire mechanism, and its structure is fixedly connected to the ejector plate mechanism 230 (specifically the ejector panel 232) of the mold 200.

[0064] This embodiment provides a mold 200 with a secondary mold opening function, such as... Figures 7 to 11 As shown. The mold 200 integrates any of the inclined ejector mechanisms 100 described in the above embodiments.

[0065] In some specific embodiments, reference is made to Figure 7 and Figure 8 The mold 200 includes a first template (not shown) and a second template 210, which open and close along a first parting surface 211 to define a mold cavity for molding a plastic part 300.

[0066] The mold 200 also includes a support plate 220, and the second template 210 is configured to open and close with the support plate 220 along the second parting surface 221. This means that during the mold opening process, the second template 210 will first generate a floating displacement relative to the support plate 220.

[0067] Inside the support plate 220, there is a pin plate mechanism 230, which consists of a pin base plate 231 and a pin panel 232. The pin panel 232 is configured to move independently relative to the pin base plate 231 after the second template 210 has completed its floating displacement.

[0068] The inclined push mechanism 100 is installed as follows: its guide sleeve 130 is fixed in the second template 210, while its straight push rod 110 is connected to the push pin panel 232 for transmission.

[0069] When the mold 200 is opened for the second time, the second template 210 floats together with the guide sleeve 130 of the fixed inclined ejector mechanism 100. After the floating is completed, the ejector plate 232 in the ejector plate mechanism 230 begins to move independently, pushing the straight ejector rod 110 upward, thereby driving the inclined ejector mechanism 100 to complete the ejection and demolding of the plastic part 300.

[0070] In some specific embodiments, reference is made to Figure 8 , Figure 9 and Figure 11 The mold 200 is equipped with a hydraulic cylinder 240 and a buckle 250 as a drive and control system.

[0071] The cylinder body 241 of the hydraulic cylinder 240 is fixed on the support plate 220, and the telescopic rod 242 is connected to the ejector plate mechanism 230. When the telescopic rod 242 of the hydraulic cylinder 240 extends, it is configured to first drive the ejector base plate 231 and the ejector panel 232 to move as a whole. At this time, the ejector panel pushes the second template 210 to float through other transmission mechanisms (such as pull rods). After the second template 210 completes a floating displacement relative to the support plate 220, it can drive only the ejector panel 232 to move.

[0072] The fastener 250 includes a base 251 mounted on the ejector base plate 231, a fastener 252 (with a groove 2521) mounted on the support plate 220, and a fastener 253 mounted on the second template 210.

[0073] When the hydraulic cylinder 240 drives the ejector plate mechanism 230 to move upward, thereby causing the second template 210 to float, the latch 253 will move accordingly. After the second template 210 completes the preset floating displacement, the latch 253 moves exactly to the position of the fastener 252 and engages with it, locking it in the groove 2521. This locking action restricts the further movement of the second template 210. At this time, the telescopic rod 242 of the hydraulic cylinder 240 continues to drive. Since the movement of the ejector base plate 231 is also limited by the locked second template 210, only the ejector panel 232 can continue to move independently, thereby driving the inclined ejector mechanism 100.

[0074] In one specific embodiment, reference is made to Figure 10 and Figure 11 The mold 200 also includes a slider mechanism 260. The driving force of the slider mechanism 260 comes from the floating process of the second template 210 relative to the support plate 220. This is typically achieved by the engagement of an inclined guide post (not shown) provided on the support plate 220 with an inclined hole in the slider mechanism 260.

[0075] The complete demolding process in this embodiment:

[0076] Phase 1 (Internal Core Pulling Movement): After the mold opens along the first parting surface 211, the hydraulic cylinder 240 begins to operate. The second template 210 floats relative to the support plate 220. During this process, the slider mechanism 260 is driven to complete the core pulling of the first undercut of the plastic part 300.

[0077] Second stage (slanted ejector demolding motion): When the floating displacement is completed, the locking mechanism 250 locks the second template 210, and the core-pulling action of the slider mechanism 260 is also completed. Subsequently, the ejector plate 232 begins to move independently, driving the slanted ejector mechanism 100 to complete the demolding of the second internal undercut of the plastic part 300.

[0078] Through the collaborative work of the two stages mentioned above, mold 200 can perfectly solve the production problem of plastic parts with complex undercut structures that have multiple different orientations and need to be demolded in sequence, realizing a fully automatic, high-efficiency, and high-reliability production process.

[0079] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model 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 this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A slanted ejector mechanism, applied to a mold with a secondary mold opening function, for demolding the internal undercut structure of a plastic part, characterized in that, include: A straight push rod is configured to receive the linear driving force of the mold ejector plate mechanism; The inclined push rod has its axis forming a predetermined angle with the straight push rod; A guide sleeve, wherein the guide sleeve is provided with a straight guide hole and an oblique guide hole that are interconnected, for sliding guidance of the straight push rod and the oblique push rod, respectively; The transmission mechanism is provided between the straight push rod and the inclined push rod and is constrained by the guide sleeve, so as to convert the vertical linear movement of the straight push rod into the oblique movement of the inclined push rod along its own axis.

2. The inclined jacking mechanism according to claim 1, characterized in that, The transmission and engagement structure includes: The helical teeth integrally formed on the straight push rod body; and An inclined groove integrally formed on the inclined top rod body and meshing with the inclined teeth.

3. The inclined jacking mechanism according to claim 1, characterized in that, The straight push rod has a non-circular cross-section, and the straight guide hole has an inner contour that matches the non-circular cross-section to limit the rotation of the straight push rod during movement.

4. The inclined jacking mechanism according to claim 1, characterized in that, The top end of the inclined push rod is connected to an inclined push block for forming the internal inverted structure, and the inclined push block and the inclined push rod are fixed together by a fixing pin.

5. The inclined jacking mechanism according to claim 1, characterized in that, The guide sleeve is also provided with screw holes for installing and fixing the guide sleeve into the second template of the mold using fasteners.

6. The inclined jacking mechanism according to claim 1, characterized in that, The bottom end of the straight push rod is fixedly connected to the ejector plate mechanism of the mold.

7. A mold, characterized in that, The mold includes the inclined ejector mechanism as described in any one of claims 1-6.

8. The mold according to claim 7, characterized in that, The mold also includes: A first template and a second template, the first template and the second template cooperate to define a mold cavity for molding plastic parts, and can be opened and closed along the first parting surface; A tray, configured to open and close twice with the second template along a second parting surface, to allow the second template to float relative to the tray during mold opening; and An ejector plate mechanism is housed within the support plate. The ejector plate mechanism includes an ejector base plate and an ejector panel. The ejector panel is configured to move independently relative to the ejector base plate after the second template has completed its floating displacement. The guide sleeve of the inclined ejector mechanism is fixed in the second template, and the straight ejector rod is connected to the ejector plate in the ejector plate mechanism. After the second template completes its floating displacement, the ejector plate in the ejector plate mechanism continues to drive the inclined ejector mechanism to eject the plastic part.

9. The mold according to claim 8, characterized in that, The mold also includes: A hydraulic cylinder configured to drive the ejector plate mechanism to move relative to the support plate; the hydraulic cylinder includes a cylinder body and a telescopic rod, the cylinder body being fixedly connected to the support plate, and the telescopic rod being fixedly connected to the ejector plate mechanism, and is configured to drive the ejector base plate to move together with the ejector panel; and is also configured to drive only the ejector panel to move; and The fastening mechanism includes a base, a fastener, and a fastener key. The base is mounted on the ejector base plate of the ejector plate mechanism, 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. Wherein, after the second template completes the floating displacement relative to the support plate, the snap key engages and locks with the groove of the fastener to restrict further movement of the second template; the hydraulic cylinder only drives the ejector plate to drive the inclined ejector mechanism.

10. The mold according to claim 9, characterized in that, The mold also includes a slider mechanism, the driving force of which comes from the floating process of the second template relative to the support plate to realize the first stage of inner core pulling movement; after the first stage of core pulling is completed, the inclined ejector mechanism performs the second stage of demolding movement of the plastic part.

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