A slider driving mechanism

Abstract

This utility model relates to the field of mold technology and provides a slider driving mechanism, including: a fixed mold assembly with a track groove; a moving mold assembly having an open mold state and a closed mold state with respect to the fixed mold assembly; and a slider assembly disposed on the moving mold assembly, having a slider and a rolling element, the rolling element being drively connected to the slider. When the fixed mold assembly and the moving mold assembly switch between the open mold state and the closed mold state, at least a portion of the rolling element is rotatably accommodated in the track groove and rolls along the track groove to drive the slider to move between the forming position and the demolding position. By using the rolling engagement between the rolling element in the slider assembly and the track groove on the fixed mold assembly, traditional sliding friction is replaced, reducing frictional resistance and mechanical wear during movement, improving the smoothness of slider movement and forming accuracy, and extending the overall service life of the mold, effectively reducing subsequent maintenance costs and downtime.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, and specifically relates to a slider driving mechanism. Background Technology

[0002] In molding processes such as injection molding and die casting, to address complex structures on the sidewalls of molded products, such as grooves, holes, or undercuts, which cannot be directly demolded in the main mold opening direction, a slider mechanism is typically required in the mold. The core of the slider mechanism lies in how to reliably and accurately drive the slider to complete the core-pulling (moving to the demolding position) and resetting (moving to the molding position) actions using the mold's own opening and closing motion.

[0003] In the prior art, the most common slider driving method for a slider driving mechanism is to use an inclined guide post structure. This structure typically has one or more inclined guide posts on the fixed mold, and corresponding inclined holes are opened on the slider of the moving mold. During mold closing, the inclined guide posts are inserted into the inclined holes of the slider, and the slider is pushed to the forming position by the forced guiding action of the inclined surfaces; during mold opening, the inclined guide posts are withdrawn from the inclined holes, and the slider is reset to the demolding position under the action of tension or spring.

[0004] However, in long-term use, this traditional inclined guide post driving method is prone to fatigue bending or plastic deformation due to the slender rods that bear huge lateral forces, under repeated mold opening and closing impacts and high clamping forces. Once the inclined guide post bends, the fitting accuracy between it and the inclined hole of the slider will be severely reduced, which will not only increase the motion resistance, but in more serious cases, it will directly jam or crush the slider, leading to slider damage or even mold scrapping, resulting in significant economic losses.

[0005] Furthermore, the fit between the angled guide post and the angled hole of the slider is purely sliding friction. Under the enormous clamping force, the contact surface generates huge friction, which not only consumes a large amount of driving energy but also leads to rapid wear and "burn-in" (i.e., cold welding) of the contact surface (especially the surface of the angled guide post). This severe wear further exacerbates the deformation and damage of the angled guide post, significantly shortens the service life of the entire mechanism, and increases maintenance costs and downtime. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a slider driving mechanism, which replaces the traditional sliding friction by the rolling cooperation between the rolling element in the slider assembly and the track groove on the fixed mold assembly.

[0007] The technical solution adopted by this utility model to solve its technical problem is to propose a slider driving mechanism, comprising: A fixed mold assembly, on which a track groove is formed; The moving mold assembly has an open mold state and a closed mold state with the fixed mold assembly; A slider assembly is disposed on the moving mold assembly and has a slider and a rolling element, the rolling element being kinetically connected to the slider; When the fixed mold assembly and the moving mold assembly switch between the mold opening state and the mold closing state, at least a portion of the rolling element is rotatably accommodated in the track groove and rolls along the track groove to drive the slider to move between the forming position and the demolding position.

[0008] In the aforementioned slider driving mechanism, the track groove includes a first segment, a second segment, and a third segment connected in sequence, and the first segment and the second segment, as well as the second segment and the third segment, are connected by a circular arc transition.

[0009] In the aforementioned slider driving mechanism, the first segment, the second segment, and the third segment are all inclined relative to the opening and closing direction of the moving mold assembly, and the inclination angle of the second segment is greater than that of the first segment and the third segment.

[0010] In one of the slider driving mechanisms described above, the track groove has an open end, which is flared to guide the rolling element into the track groove.

[0011] In one of the slider driving mechanisms described above, the fixed mold assembly includes a guide plate, and the trajectory groove is formed on the guide plate.

[0012] In one of the slider driving mechanisms described above, the slider assembly further includes a slider seat, the slider is disposed on the slider seat, and the rolling element is a rolling bearing, which is mounted on the slider seat via a rotating shaft.

[0013] In one of the slider driving mechanisms described above, a fixed seat is also provided on the moving mold assembly, and the slider seat is slidably disposed on the fixed seat.

[0014] In the aforementioned slider driving mechanism, the fixed base is provided with a guide groove, the slider seat is provided with a guide block, and the slider seat slides along the guide groove via the guide block.

[0015] In one of the slider driving mechanisms described above, a movable rod is also movably mounted on the fixed base, with one end of the movable rod passing through the fixed base and connected to the guide block.

[0016] In the aforementioned slider driving mechanism, an elastic element is also sleeved on the moving rod. One end of the elastic element abuts against the moving rod, and the other end abuts against the fixed seat. When the slider seat drives the slider to move towards the forming position, it is compressed and undergoes elastic deformation.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The traditional sliding friction is replaced by the rolling engagement between the rolling elements in the slider assembly and the track grooves on the fixed mold assembly. This rolling friction mechanism reduces frictional resistance and mechanical wear during the movement process, effectively avoiding the high temperature and "burn-out" phenomenon caused by severe friction. At the same time, due to the improved stress state, the mechanism is less prone to fatigue bending or plastic deformation under long-term high-frequency mold opening and closing impacts, thus avoiding the hidden dangers of jamming and scratching the slider surface of traditional mechanisms. This not only improves the smoothness of slider movement and molding accuracy, but also extends the overall service life of the mold, effectively reducing the later maintenance costs and downtime.

[0019] (2) By setting the guide groove on the fixed seat and the guide block on the slider seat, the decoupling of the "driving" and "guiding" functions is realized: the rolling element is responsible for providing the lateral driving force, while the huge lateral cutting force and clamping force generated during the movement of the slider are borne by the guide groove and guide block on the fixed seat, which effectively avoids damage to the core transmission components due to overload and significantly improves the reliability and service life of the mechanism.

[0020] (3) Through the cooperation of the moving rod and the elastic element, a continuous elastic preload is provided to the slider assembly, which effectively eliminates the mechanical fit clearance and prevents the slider from "running" under high injection pressure, thus ensuring the dimensional accuracy of the molded product. At the same time, the elastic preload ensures the stability of the initial position of the rolling element, enabling it to be accurately and smoothly guided into the flared opening of the track groove in the early stage of mold closing; in the mold opening and reset stage, the elastic force released by the elastic element works in synergy with the rolling element, making the reset action of the slider more stable and effectively buffering the mechanical impact at the moment of mold closing. Attached Figure Description

[0021] Figure 1 This is a 3D view of the proposed solution.

[0022] Figure 2 It is a three-dimensional view of the connection between the guide plate, fixed seat, moving rod, elastic element, slider and slider seat.

[0023] Figure 3 It is a three-dimensional view of the connection between the fixed seat, the moving rod, the elastic element, the slider, the rolling element, and the slider seat.

[0024] Figure 4 It is a three-dimensional view of the connection between the fixed seat, the moving rod, the elastic element and the guide block.

[0025] Figure 5 This is a 3D view of the slider assembly in this solution.

[0026] Figure 6This is a 3D view of the guide plate in this solution.

[0027] In the figure, 100 is the fixed mold assembly; 110 is the guide plate; 111 is the track groove; 111a is the first segment; 111b is the second segment; 111c is the third segment; 200 is the moving mold assembly; 210 is the fixed base; 211 is the guide groove; 220 is the moving rod; 230 is the elastic element; 300 is the slider assembly; 310 is the slider; 320 is the rolling element; 330 is the slider seat; and 340 is the guide block. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] like Figures 1 to 6 As shown, this solution provides a slider driving mechanism, comprising: a fixed mold assembly 100 having a track groove 111 thereon; a moving mold assembly 200 having an open mold state and a closed mold state with respect to the fixed mold assembly 100; and a slider assembly 300 disposed on the moving mold assembly 200, having a slider 310 and a rolling element 320, the rolling element 320 being drively connected to the slider 310; when the fixed mold assembly 100 and the moving mold assembly 200 switch between the open mold state and the closed mold state, at least a portion of the rolling element 320 is rotatably accommodated in the track groove 111 and rolls along the track groove 111 to drive the slider 310 to move between the forming position and the demolding position.

[0031] When the moving mold assembly 200 and the fixed mold assembly 100 switch from the mold-opening state to the mold-closed state, the rolling element 320, driven by the moving mold assembly 200, gradually embeds itself into and is accommodated in the track groove 111 of the fixed mold assembly 100. As the mold-closing process progresses, the rolling element 320 rolls along the predetermined path of the track groove 111, thereby driving the slider 310 to move to the forming position; conversely, when the mold switches from the mold-closed state to the mold-opening state, the rolling element 320, driven by the moving mold assembly 200, rolls in the opposite direction along the track groove 111, driving the slider 310 to smoothly return to the demolding position, thus successfully completing the core-pulling action.

[0032] Compared to traditional inclined guide post mechanisms, the rolling element 320 and the track groove 111 in this design use rolling contact, replacing traditional sliding friction. This rolling friction mechanism reduces frictional resistance and mechanical wear during movement, effectively avoiding high temperatures and "burn-in" phenomena caused by intense friction. Simultaneously, due to the improved stress state, the mechanism is less prone to fatigue bending or plastic deformation under long-term, high-frequency mold opening and closing impacts, thus avoiding the potential for jamming and scratching of the slider 310 surface in traditional mechanisms. This not only significantly improves the smoothness and molding accuracy of the slider 310 movement but also greatly extends the overall service life of the mold, effectively reducing subsequent maintenance costs and downtime.

[0033] Furthermore, the track groove 111 includes a first segment 111a, a second segment 111b, and a third segment 111c connected in sequence, and the first segment 111a and the second segment 111b, as well as the second segment 111b and the third segment 111c, are connected by a circular arc transition.

[0034] The various track grooves 111 are connected by a circular arc transition, which makes the force on the rolling element 320 more continuous and smooth when changing the direction of movement. This effectively avoids the mechanical impact and movement jamming phenomenon generated at the inflection point of the traditional broken line guide rail, greatly reduces the local contact stress between the rolling element 320 and the track groove 111, and further extends the service life of the mechanism.

[0035] Furthermore, the first segment 111a, the second segment 111b, and the third segment 111c are all inclined relative to the opening and closing direction of the moving mold assembly 200, and the inclination angle of the second segment 111b is greater than the inclination angle of the first segment 111a and the third segment 111c.

[0036] By setting a larger tilt angle for the second intermediate segment 111b, the mechanism can drive the slider 310 to achieve a "slow, fast, slow" variable speed motion during operation. During the initial and final stages of core pulling and resetting (corresponding to the first segment 111a and the third segment 111c), the slider 310 moves at a slower speed, effectively avoiding rigid impacts on the mold and injection-molded product at the moment of start-up and stop. In the middle of the stroke (corresponding to the second segment 111b), the slider 310 moves rapidly, significantly shortening the core pulling time. This variable speed design ensures both the safety of demolding and significantly improves mold opening efficiency.

[0037] Furthermore, the track groove 111 has an open end, which is flared to guide the rolling element 320 into the track groove 111. The flared design of the open end provides tolerance space and guidance. In the initial stage of mold closing, even if there is a slight positional deviation between the rolling element 320 and the track groove 111, the flared end can smoothly "capture" it and guide it into the correct motion trajectory. This avoids the fatal defects of traditional inclined guide pillars, which are prone to rigid collisions, jamming, or damage to the mold due to misalignment during mold closing, and greatly improves the safety and stability of mold operation.

[0038] Furthermore, the fixed mold assembly 100 includes a guide plate 110, on which a track groove 111 is formed. By independently forming the track groove 111 on the guide plate 110, a modular design of the mechanism is achieved. This structure not only significantly reduces the machining difficulty and manufacturing cost of the complex track groove 111, but also allows the guide plate 110 to be made of high-hardness wear-resistant alloy steel and undergo targeted heat treatment, thereby significantly improving wear resistance. In addition, when the track groove 111 wears beyond tolerance, only the small guide plate 110 needs to be replaced to restore mold accuracy, effectively avoiding the risk of scrapping the bulky fixed mold body, greatly shortening downtime for maintenance, and reducing long-term maintenance costs.

[0039] Furthermore, the slider assembly 300 also includes a slider seat 330, on which the slider 310 body is fixedly mounted; the rolling element 320 adopts a rolling bearing and is mounted on the side wall of the slider seat 330 via a rotating shaft. The rolling element 320 can also be a roller, a cylinder, or a ball; in actual mold structure design, rolling bearings, rollers (simple structure, impact resistant), cylinders (heavy load, high rigidity), or balls (high precision, low friction) can be flexibly selected as the rolling element 320 according to the force applied to the slider 310, the required motion accuracy, and the installation space.

[0040] Meanwhile, the moving mold assembly 200 is also provided with a fixed base 210, and the slider seat 330 is slidably disposed on the fixed base 210. Specifically, the fixed base 210 is provided with a guide groove 211, and the slider seat 330 is provided with a guide block 340. The slider seat 330 slides through the cooperation of the guide block 340 and the guide groove 211.

[0041] The rolling element 320 protrudes from the side wall of the slider seat 330 to mate with the track groove 111 on the fixed mold assembly 100. During operation, the rolling bearing rolls along the track groove 111 to provide lateral driving force, while the slider seat 330 slides along the guide groove 211 of the fixed seat 210 via the guide block 340, providing precise linear guidance for the movement of the slider seat 330.

[0042] The above design cleverly separates the "driving" and "guiding" functions. The rolling bearing is responsible for rolling within the track groove 111 to provide lateral driving force, while the huge lateral cutting force and clamping force generated by the slider 310 during movement are borne by the guide groove 211 and guide block 340 on the fixed seat 210. This effectively avoids fatigue spalling or damage to the rolling bearing due to excessive radial load, greatly improving the reliability of the mechanism.

[0043] By transforming traditional sliding friction into rolling friction between the rolling bearing and the track groove 111, motion resistance is greatly reduced. This not only reduces energy loss during the drive process but also completely avoids the high temperature and "burn-in" phenomenon caused by severe friction, making the movement of the slider 310 mechanism smoother and significantly extending its service life.

[0044] The guide groove 211 on the fixed seat 210 and the guide block 340 on the slider seat 330 form a high-precision linear guide pair. When the slider 310 performs core pulling and resetting actions, the guide block 340 can restrict the movement trajectory of the slider seat 330, preventing it from tilting or shifting under force, thereby ensuring the dimensional accuracy of the molded product and the stability of the mold operation.

[0045] Furthermore, a movable rod 220 is movably mounted on the fixed base 210, with one end of the movable rod 220 passing through the fixed base 210 and connected to the guide block 340.

[0046] Furthermore, an elastic element 230 is also fitted onto the moving rod 220. One end of the elastic element 230 abuts against the moving rod 220, and the other end abuts against the fixed seat 210. When the slider seat 330 drives the slider 310 to move towards the forming position, it is compressed and undergoes elastic deformation. The elastic element 230 can be a compression spring, a disc spring, an elastic material layer, or a rubber pad. In actual mold engineering applications, depending on the specific dimensions of the slider 310, the required preload, and the installation space, a compression spring (emphasizing conventional reset and buffering), a disc spring (emphasizing anti-gap preload under heavy load), or a rubber elastic element (emphasizing strong buffering and vibration absorption) can be flexibly selected.

[0047] When the slider seat 330 drives the slider 310 to move to the forming position, the moving rod 220 is driven by the guide block 340 and compresses the elastic element 230 to cause elastic deformation; when the slider 310 switches from the forming position to the demolding position, the elastic element 230 releases its elastic force, and together with the sliding of the rolling element 320 along the track groove 111, it drives the slider 310 to return to its original position smoothly.

[0048] During compression and release, the elastic element 230 provides a continuous elastic preload to the slider assembly 300. This preload effectively eliminates mechanical clearances between the guide block 340 and the guide groove 211, and between the rolling element 320 and the track groove 111. During the mold opening and core pulling stage, the elastic force released by the elastic element 230 acts as an auxiliary power source, working in conjunction with the rolling element 320 to make the reset action of the slider 310 smoother and more stable, avoiding rigid impacts. Simultaneously, during the mold closing stage, the compression deformation of the elastic element 230 provides excellent buffering, absorbing the mechanical impact energy at the moment of mold closing and protecting the precision components inside the mold from damage. The preload of the elastic element 230 ensures the stability of the rolling element 320's position in its initial state, preventing loosening of components due to gravity or vibration. This allows the rolling element 320 to be accurately and smoothly guided into the trumpet-shaped opening of the track groove 111 during the initial mold closing stage, eliminating the risk of jamming caused by misalignment and further ensuring the safety of mold operation.

[0049] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0051] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A slider driving mechanism, characterized in that, include: A fixed mold assembly, on which a track groove is formed; The moving mold assembly has an open mold state and a closed mold state with the fixed mold assembly; A slider assembly is disposed on the moving mold assembly and has a slider and a rolling element, the rolling element being kinetically connected to the slider; When the fixed mold assembly and the moving mold assembly switch between the mold opening state and the mold closing state, at least a portion of the rolling element is rotatably accommodated in the track groove and rolls along the track groove to drive the slider to move between the forming position and the demolding position.

2. The slider driving mechanism as described in claim 1, characterized in that, The trajectory groove includes a first segment, a second segment, and a third segment connected in sequence, and the first segment and the second segment, as well as the second segment and the third segment, are connected by a circular arc transition.

3. The slider driving mechanism as described in claim 2, characterized in that, The first segment, the second segment, and the third segment are all inclined relative to the opening and closing direction of the moving mold assembly, and the inclination angle of the second segment is greater than that of the first segment and the third segment.

4. The slider driving mechanism as described in claim 1, characterized in that, The track groove has an open end, which is flared to guide the rolling element into the track groove.

5. The slider driving mechanism as described in claim 1, characterized in that, The fixed mold assembly includes a guide plate, and the track groove is formed on the guide plate.

6. The slider driving mechanism as described in claim 1, characterized in that, The slider assembly also includes a slider seat, the slider is disposed on the slider seat, and the rolling element is a rolling bearing, which is mounted on the slider seat via a rotating shaft.

7. The slider driving mechanism as described in claim 6, characterized in that, The moving mold assembly is also provided with a fixed base, and the slider seat is slidably disposed on the fixed base.

8. The slider driving mechanism as described in claim 7, characterized in that, The fixed base is provided with a guide groove, and the slider base is provided with a guide block. The slider base slides along the guide groove via the guide block.

9. The slider driving mechanism as described in claim 8, characterized in that, A movable rod is also movably mounted on the fixed base, with one end of the movable rod passing through the fixed base and connected to the guide block.

10. The slider driving mechanism as described in claim 9, characterized in that, An elastic element is also fitted on the moving rod. One end of the elastic element abuts against the moving rod, and the other end abuts against the fixed seat. When the slider seat drives the slider to move to the forming position, it is compressed and undergoes elastic deformation.

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