Sectional multi-time core-pulling U-shaped elbow injection mold and core-pulling method

Abstract

The invention relates to the technical field of injection molds, in particular to a segmented multi-time core-pulling U-shaped elbow injection mold and a core-pulling method. A U-shaped mold cavity is formed between a movable mold core and a fixed mold core, fixed core-pulling blocks are arranged at two openings of the mold cavity, and a plurality of movable core-pulling blocks are sequentially clamped to the inner sides of the fixed core-pulling blocks; a first core-pulling base, a second core-pulling base and a fixing plate are movably arranged in the protection plate, a first buckling machine combination mechanism is arranged between the first core-pulling base and the fixing plate, and a second buckling machine combination mechanism is arranged between the bottom of the fixing plate and the bottom of the second core-pulling base. And a third buckling machine combination mechanism is arranged between the top of the fixed plate and the top of the second core-pulling base. According to the mold, the problem of demolding of the inner hole of the middle arc section is solved, a plastic part with a complex structure can be efficiently and smoothly separated from the mold, the production efficiency is greatly improved, the quality stability and consistency of a final product are guaranteed, and the overall production cost is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a segmented multiple core-pulling U-shaped elbow injection mold and a core-pulling method. Background Art

[0002] In the field of plastic product manufacturing, especially for pipe products with complex geometric shapes, such as elbow connectors, traditional mold design faces many challenges. With the advancement of plastic material science and the expansion of application areas, more and more traditional metal products are being replaced by lighter and more cost-effective plastic products. However, in specific application scenarios, such as when high mechanical strength or special structural requirements are required, traditional mold design methods are difficult to achieve efficient and high-quality production.

[0003] When it comes to the injection mold of the U-shaped elbow, the key issue is how to effectively solve the demoulding problem of the inner hole of the middle arc section. The conventional direct core pulling method cannot make the plastic part smoothly leave the mold, and the traditional arc core pulling method is limited by the straight edge structure of the two end holes and the overall size of the plastic part, so it cannot be implemented. Therefore, when facing such complex structure plastic parts, the existing technology often leads to low production efficiency, unstable product quality, and may increase production costs. Summary of the invention

[0004] The present invention aims to at least solve the technical problems existing in the prior art. To this end, the present invention proposes a U-shaped elbow injection mold with segmented multiple core pulling and a core pulling method, which effectively solves the demoulding problem in the prior art by segmented multiple core pulling.

[0005] According to some embodiments of the first aspect of the present invention, a segmented multiple core-pulling U-shaped elbow injection mold comprises a panel and a bottom plate, wherein a fixed mold plate is provided at the bottom of the panel, a fixed mold core is provided at the bottom of the fixed mold plate, a movable mold plate is provided at the top of the bottom plate, a movable mold core is provided at the top of the movable mold plate, a fixed mold core is provided at the top of the movable mold core, a U-shaped mold cavity is provided between the movable mold core and the fixed mold core, both openings of the mold cavity are provided with fixed core-pulling blocks, a plurality of movable core-pulling blocks are sequentially clamped on the inner side of the fixed core-pulling blocks, a driving mechanism is provided at the end of the movable mold plate, a protective plate is provided at the top of the movable mold plate, a first core-pulling base is movably provided inside the protective plate, and the driving mechanism is connected to the movable mold plate. The first core-pulling base is connected, and a second core-pulling base and a fixed plate are movably arranged inside the protective plate. The fixed plate is arranged between the first core-pulling base and the second core-pulling base. Follower springs are arranged on both sides of the fixed plate. The follower springs are sequentially passed through the first core-pulling base, the fixed core-pulling block and a plurality of movable core-pulling blocks. A first buckle machine assembly mechanism is arranged between the first core-pulling base and the fixed plate. The bottom of the first core-pulling base is linked to two fixed core-pulling blocks. A second buckle machine assembly mechanism is arranged between the bottom of the fixed plate and the bottom of the second core-pulling base. A third buckle machine assembly mechanism is arranged between the top of the fixed plate and the top of the second core-pulling base.

[0006] According to some embodiments of the first aspect of the present invention, a segmented multiple core-pulling U-shaped elbow injection mold has at least the following beneficial effects:

[0007] The present invention solves the demolding problem of the inner hole of the intermediate arc segment which cannot be handled by the traditional direct core pulling and arc core pulling methods by introducing a segmented multiple core pulling structure, so that the plastic parts with complex structures can be efficiently and smoothly separated from the mold, which greatly improves the production efficiency. The mold specially considers the structural strength requirements of the plastic parts, ensuring that the plastic parts will not be damaged or deformed during the demolding process, thereby ensuring the quality stability and consistency of the final product. The solution proposed by the present invention simplifies the mold structure and effectively reduces the overall production cost.

[0008] According to some embodiments of the first aspect of the present invention, a U-shaped bend tube injection mold with segmented multiple core pulling, the first locking machine assembly mechanism includes a release rod and two movable blocks, the release rod is arranged at the end of the first core pulling base away from the mold cavity, a receiving cavity is arranged in the fixed plate, springs are arranged on both sides of the receiving cavity, the movable block is connected to the spring, an abutment slope is arranged at the end of the movable block, a protrusion is arranged at the end of the release rod, the protrusion is arranged corresponding to the abutment slope, a positioning groove is arranged in the middle of the movable block, and a locking rod is arranged at a section of the second core pulling base close to the first core pulling base, and the locking rod extends into the positioning groove.

[0009] According to some embodiments of the first aspect of the present invention, a U-shaped elbow injection mold with segmented multiple core pulling is provided with multiple guide rods at one end of the second core pulling base close to the first core pulling base, and the guide rods are sequentially passed through the fixed plate and the first core pulling base.

[0010] According to some embodiments of the first aspect of the present invention, a U-shaped bend tube injection mold with segmented multiple core pulling, the second buckle machine assembly mechanism includes a seesaw, a base is provided on the top of the movable template, a rotating shaft is provided on the base, the seesaw is provided on the top of the movable template, an abutment portion is provided at one end of the seesaw close to the first core pulling base, a first locking buckle is provided at the other end of the seesaw, a first buckling portion is provided at the bottom of the second core pulling base, the first locking buckle is provided corresponding to the first buckling portion, a release groove is provided at the bottom of the first core pulling base, the release groove is provided corresponding to the abutment portion, an elastic push component is provided on the top of the movable template, and the elastic push component is located at the bottom of the abutment portion.

[0011] According to some embodiments of the first aspect of the present invention, a segmented multiple core-pulling U-shaped bend tube injection mold is provided, wherein a long strip-shaped groove is opened on the top of the movable mold plate, the base is arranged in the middle of the groove, and the rocker is located in the groove.

[0012] According to some embodiments of the first aspect of the present invention, a U-shaped bend tube injection mold with segmented multiple core pulling is provided, and the third buckle machine assembly mechanism includes an insert rod and a second lock buckle, the insert rod is arranged at one end of the first core pulling base close to the fixed plate, the end of the insert rod is provided with a second buckle portion, the second lock buckle is arranged at one end of the second core pulling base close to the fixed plate, and the end of the second core pulling base close to the fixed plate is provided with a buckle groove.

[0013] According to some embodiments of the first aspect of the present invention, a U-shaped elbow injection mold with segmented multiple core pulling is provided at the edge of the fixed plate, the insertion rod is passed through the avoidance portion, and one end of the second lock is rotatably connected to the second core pulling base.

[0014] According to a U-shaped elbow injection mold with segmented multiple core pulling in some embodiments of the first aspect of the present invention, the inner wall of the protective plate is provided with an avoidance groove, and the avoidance groove is arranged corresponding to the second lock buckle.

[0015] According to some embodiments of the first aspect of the present invention, a segmented multiple core-pulling U-shaped bend tube injection mold is provided, square irons are arranged on both sides of the top of the bottom plate, the movable mold plate is arranged on the top of the square irons, and a pin mechanism is arranged on the top of the bottom plate, and the pin mechanism is located at the bottom of the U-shaped mold cavity.

[0016] A core pulling method for a U-shaped elbow injection mold according to some embodiments of the second aspect of the present invention is applied to the U-shaped elbow injection mold described in some embodiments of the first aspect, comprising the following steps:

[0017] S100, when the first buckle machine assembly is in operation, the driving mechanism drives the first core pulling base away from the mold cavity, the fixed plate remains in position, and the first core pulling base moves to drive the two fixed core pulling blocks to separate from the movable core pulling block;

[0018] S200, the first locking machine assembly mechanism fails, the second locking machine assembly mechanism changes from failure to effectiveness, the driving mechanism drives the first core pulling base to continue to move away from the mold cavity, the first core pulling base abuts against the fixed plate, the first core pulling base drives the fixed plate to move together, the conformal spring drives the multiple movable core pulling blocks to be partially pulled out, and the multiple movable core pulling blocks are separated from each other;

[0019] S300, the second buckle machine assembly mechanism fails, the third buckle machine assembly mechanism changes from failure to effectiveness, the first core pulling base, the fixed plate and the second core pulling base are synchronously displaced, driving the fixed core pulling block and the movable core pulling block to pull the core;

[0020] S400, reset to prepare for the next core pulling.

[0021] According to some embodiments of the first aspect of the present invention, a segmented multiple core-pulling U-shaped elbow injection mold has at least the following beneficial effects:

[0022] The first, second and third latch combination mechanisms ensure accurate movement of each component at different stages. The step-by-step and orderly operation ensures the accuracy and reliability of the entire demoulding process. During the core pulling process, the design of the conformal spring can not only provide the necessary elastic support, but also ensure a smooth transition between the active core pulling blocks, avoiding damage or deformation of plastic parts caused by sudden movements. The core pulling method is executed in steps, and each step corresponds to a specific mechanical structure change, which helps to reduce human intervention, speed up production, improve overall work efficiency, reduce unnecessary energy consumption, and minimize wear on molds and other equipment. In the long run, this method helps to reduce maintenance costs and extend equipment life.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1It is a schematic structural diagram of an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention without the panel, fixed mold plate and protective plate.

[0027] Figure 3 It is a cross-sectional view of an embodiment of the present invention.

[0028] Figure 4 This is a cross-sectional view of an embodiment of the present invention after the panel, fixed mold plate and protective plate are hidden.

[0029] Figure 5 It is a schematic structural diagram of a first core-pulling base and a fixing plate according to an embodiment of the present invention.

[0030] Figure 6 The figure is a schematic structural diagram of a movable stopper and a release rod according to an embodiment of the present invention.

[0031] Figure 7 Schematic diagram of the structure of a U-shaped elbow according to an embodiment of the present invention.

[0032] Figure numerals: 1, panel, 2, bottom plate, 3, fixed mold plate, 4, fixed mold core, 5, movable mold plate, 6, movable mold core, 7, mold cavity, 8, fixed core-pulling block, 9, movable core-pulling block, 10, driving mechanism, 11, protective plate, 12, first core-pulling base, 13, second core-pulling base, 14, fixed plate, 15, conformal spring, 16, first locking machine assembly mechanism, 17, second locking machine assembly mechanism, 18, third locking machine assembly mechanism, 19, release rod, 20, movable stopper, 21, accommodating cavity, 22, spring, 23 , abutment slope, 24, protrusion, 25, positioning groove, 26, locking rod, 27, notch, 28, guide rod, 29, rocker, 30, base, 31, rotating shaft, 32, abutment part, 33, first locking buckle, 34, first buckling part, 35, release groove, 36, elastic push assembly, 37, groove, 38, insertion rod, 39, second locking buckle, 40, second buckling part, 41, buckling groove, 42, avoidance part, 43, avoidance groove, 44, square iron, 45, ejector mechanism, 46, waterway, 47, reset spring. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the descriptions involving orientations, such as up, down, left, right, front, back, etc., and the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] First aspect embodiment

[0038] A U-shaped elbow injection mold with multiple core pulling in sections, such as Figure 1-Figure 7 As shown, it includes a panel 1 and a bottom plate 2, a fixed mold plate 3 is provided at the bottom of the panel 1, a fixed mold core 4 is provided at the bottom of the fixed mold plate 3, a movable mold plate 5 is provided at the top of the bottom plate 2, a movable mold core 6 is provided at the top of the movable mold plate 5, the fixed mold core 4 is arranged at the top of the movable mold core 6, a U-shaped mold cavity 7 is provided between the movable mold core 6 and the fixed mold core 4, both openings of the mold cavity 7 are provided with fixed core pulling blocks 8, a plurality of movable core pulling blocks 9 are sequentially clamped on the inner side of the fixed core pulling blocks 8, a driving mechanism 10 is provided at the end of the movable mold plate 5, a protective plate 11 is provided at the top of the movable mold plate 5, a first core pulling base 12 is movably provided inside the protective plate 11, the driving mechanism 10 is arranged corresponding to the first core pulling base 12, and the protective plate 11 A second core-pulling base 13 and a fixed plate 14 are fixedly arranged inside, and the fixed plate 14 is arranged between the first core-pulling base 12 and the second core-pulling base 13. Conforming springs 15 are arranged on both sides of the fixed plate 14, and the conforming springs 15 are sequentially penetrated through the first core-pulling base 12, the fixed core-pulling block 8 and a plurality of movable core-pulling blocks 9. A first buckle machine assembly mechanism 16 is arranged between the first core-pulling base 12 and the fixed plate 14, and the bottom of the first core-pulling base 12 is connected to the two fixed core-pulling blocks 8. A second buckle machine assembly mechanism 17 is arranged between the bottom of the fixed plate 14 and the bottom of the second core-pulling base 13, and a third buckle machine assembly mechanism 18 is arranged between the top of the fixed plate 14 and the top of the second core-pulling base 13.

[0039] The present invention solves the demoulding problem of the inner hole of the middle arc segment that cannot be handled by the traditional direct core pulling and arc core pulling methods by introducing a segmented multiple core pulling structure, so that the plastic parts with complex structures can be efficiently and smoothly removed from the mold, greatly improving the production efficiency. The mold specifically considers the structural strength requirements of the plastic parts, ensuring that the plastic parts will not be damaged or deformed during the demoulding process, thereby ensuring the quality stability and consistency of the final product. The solution proposed by the present invention simplifies the mold structure and effectively reduces the overall production cost.

[0040] It can be understood that the fixed core-pulling block 8 corresponds to the straight edge portion of the U-shaped pipe, the movable core-pulling block 9 corresponds to the arc segment portion of the U-shaped pipe, and the driving mechanism 10 is driven by a cylinder.

[0041] The present embodiment describes a U-shaped elbow injection mold with segmented multiple core pulling, wherein the first locking machine assembly mechanism 16 includes a release rod 19 and two movable blocks 20, wherein the release rod 19 is arranged at the end of the first core pulling base 12 away from the mold cavity 7, a receiving cavity 21 is arranged in the fixed plate 14, springs 22 are arranged on both sides of the receiving cavity 21, the movable block 20 is connected to the spring 22, an abutting inclined surface 23 is arranged at the end of the movable block 20, a protrusion 24 is arranged at the end of the release rod 19, and the protrusion 24 is arranged corresponding to the abutting inclined surface 23, a positioning groove 25 is arranged in the middle of the movable block 20, and a locking rod 26 is arranged at a section of the second core pulling base 13 close to the first core pulling base 12, and the locking rod 26 extends into the positioning groove 25. Specifically, the locking rod 26 extends into the positioning groove 25 before the core pulling starts, and the movable stopper 20 is acted upon by the elastic force of the spring 22, so that the inner wall of the positioning groove 25 continues to abut against the locking rod 26, and the fixed plate 14 cannot move. After the core pulling starts, the driving mechanism 10 drives the first core pulling base 12 to move, and the release rod 19 moves toward one side of the positioning block, and the protrusion 24 pushes against the abutting inclined surface 23 of the movable stopper 20, and the movable stopper 20 moves inward, so that the inner wall of the positioning groove 25 no longer abuts against the locking rod 26, and the fixed plate 14 can move at this time. It can be understood that the above structure is simple, and the first core pulling base 12 moves to pull the fixed core pulling block 8, and the fixed core pulling block 8 is separated from the movable core pulling block 9.

[0042] It is understandable that a notch 27 is provided at the end of the locking rod 26 , and the positioning groove 25 cooperates with the notch 27 . When the first trigger assembly mechanism 16 takes effect, the inner wall of the positioning groove 25 abuts against the locking rod 26 .

[0043] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, a plurality of guide rods 28 are provided at one end of the second core pulling base 13 close to the first core pulling base 12, and the guide rods 28 are sequentially penetrated through the fixed plate 14 and the first core pulling base 12. Specifically, the above arrangement enables the first core pulling base 12 and the fixed plate 14 to move along the guide rods 28, thereby ensuring the stability of demoulding.

[0044] The present embodiment describes a U-shaped bend tube injection mold with segmented multiple core pulling, wherein the second buckle machine assembly mechanism 17 includes a seesaw 29, a base 30 is provided on the top of the movable template 5, a rotating shaft 31 is provided on the base 30, the seesaw 29 is arranged at the top of the movable template 5, an abutment portion 32 is provided at one end of the seesaw 29 close to the first core pulling base 12, a first locking buckle 33 is provided at the other end of the seesaw 29, a first buckling portion 34 is provided at the bottom of the second core pulling base 13, the first locking buckle 33 is arranged corresponding to the first buckling portion 34, a release groove 35 is provided at the bottom of the first core pulling base 12, the release groove 35 is arranged corresponding to the abutment portion 32, an elastic push component 36 is provided on the top of the movable template 5, and the elastic push component 36 is located at the bottom of the abutment portion 32. Specifically, in the initial state of the first core-pulling base 12, the first lock buckle 33 is engaged with the first buckling portion 34, and the position of the second core-pulling base 13 is fixed and cannot be moved. As the first core-pulling base moves, the release groove 35 moves to one end of the abutment portion 32, and the seesaw 29 bounces up one end of the abutment portion 32 under the operation of the elastic push assembly 36, and the first lock buckle 33 is disengaged from the first buckling portion 34, so that the position of the second core-pulling base 13 is no longer fixed. The above structure is simple and does not require additional driving components to control the effectiveness and failure of the second buckle assembly mechanism 17.

[0045] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, a long strip groove 37 is opened on the top of the movable plate 5, the base 30 is arranged in the middle of the groove 37, and the rocker 29 is located in the groove 37. Specifically, the above arrangement saves valuable space inside the mold and helps to build a more compact mold structure. The groove 37 provides a stable installation foundation for the base 30 to ensure that it will not be displaced or shaken during the working process.

[0046] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, the third locking machine assembly mechanism 18 includes an insert rod 38 and a second locking buckle 39. The insert rod 38 is arranged at one end of the first core pulling base 12 close to the fixed plate 14. The end of the insert rod 38 is provided with a second locking portion 40. The second locking buckle 39 is arranged at one end of the second core pulling base 13 close to the fixed plate 14. The end of the second core pulling base 13 close to the fixed plate 14 is provided with a locking groove 41. Specifically, the first core pulling base 12 and the fixed plate 14 move together, and the insert rod 38 is inserted into the second locking buckle 39. At this time, the second locking machine assembly mechanism 18 also fails synchronously, so that the first core pulling base 12, the fixed plate 14 and the second core pulling base 13 move together.

[0047] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, the edge of the fixed plate 14 is provided with a relief portion 42, the insertion rod 38 is passed through the relief portion 42, and one end of the second lock buckle 39 is rotatably connected to the second core pulling base 13. Specifically, the above structure is compact, and two insertion rods 38 are provided, which are respectively located on both sides of the first core pulling base 12.

[0048] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, the inner wall of the protective plate 11 is provided with a relief groove 43, and the relief groove 43 is arranged corresponding to the second lock buckle 39. Specifically, the relief groove 43 allows the second lock buckle 39 to rotate within a certain range, so as to facilitate the insertion of the insertion rod 38 into the buckling groove 41, and at the same time, when resetting, the insertion rod 38 can be disengaged to provide a certain activity space.

[0049] In the U-shaped elbow injection mold with segmented multiple core pulling described in this embodiment, square irons 44 are arranged on both sides of the top of the bottom plate 2, the movable plate 5 is arranged on the top of the square irons 44, and an ejector mechanism 45 is arranged on the top of the bottom plate 2, and the ejector mechanism 45 is located at the bottom of the U-shaped mold cavity 7. Specifically, the above arrangement can eject the injection-molded U-shaped elbow, and the specific structural arrangement of the ejector mechanism 45 adopts the existing technology, which will not be described one by one here.

[0050] It can be understood that water channels 46 are provided in both the fixed mold core 4 and the movable mold core 6 to meet the cooling requirements of the mold.

[0051] Second aspect embodiment

[0052] A core pulling method for a U-shaped elbow injection mold, applied to the U-shaped elbow injection mold of the first aspect, comprises the following steps:

[0053] S100: When the first locking machine assembly mechanism 16 and the second locking machine assembly mechanism 17 are in effect, the driving mechanism 10 drives the first core pulling base 12 away from the mold cavity 7, the fixed plate 14 and the second core pulling base 13 remain in position, and the first core pulling base 12 moves to drive the two fixed core pulling blocks 8 to separate from the movable core pulling block 9;

[0054] S200: The first locking machine assembly mechanism 16 fails, and the second locking machine assembly mechanism 17 remains effective. The driving mechanism 10 drives the first core pulling base 12 to continue to move away from the mold cavity 7. The first core pulling base 12 abuts against the fixed plate 14. The first core pulling base 12 drives the fixed plate 14 to move together. The conformal spring 15 drives the multiple movable core pulling blocks 9 to be partially pulled out, and the multiple movable core pulling blocks 9 are separated from each other.

[0055] S300: The second locking assembly mechanism 17 fails, and the third locking assembly mechanism 18 changes from failure to effectiveness, and the first core pulling base 12, the fixed plate 14 and the second core pulling base 13 are synchronously displaced, driving the fixed core pulling block 8 and the movable core pulling block 9 to completely pull the core;

[0056] S400: Reset to prepare for the next core pulling.

[0057] The present invention ensures the accurate movement of each component at different stages through the first, second and third latching machine combination mechanisms. The step-by-step and orderly operation method ensures the accuracy and reliability of the entire demoulding process. During the core pulling process, the design of the conformal spring can not only provide the necessary elastic support, but also ensure the smooth transition between the various active core pulling blocks, avoiding damage or deformation of plastic parts caused by sudden movements. The core pulling method is executed in steps, and each step corresponds to a specific mechanical structure change, which helps to reduce human intervention, speed up the production rhythm, improve overall work efficiency, reduce unnecessary energy consumption, and minimize wear on molds and other equipment. In the long run, this method helps to reduce maintenance costs and extend equipment life.

[0058] Step S400 specifically includes:

[0059] S410, the driving mechanism 10 drives the first core-pulling base 12 and the second core-pulling base 13 to move synchronously, and the conformal spring 15 drives the fixing plate 14 to move synchronously until the third locking assembly 18 fails, the second locking assembly 17 mechanism changes from failure to effectiveness, and the second core-pulling base 13 is fixed;

[0060] S420, the driving mechanism drives the first core-pulling base 12 to continue to move, and the conformal spring 15 drives the fixed plate 14 to move synchronously until the first locking assembly 16 changes from failure to effectiveness, and the first core-pulling base 12, the fixed plate 14, the movable core-pulling block 9 and the fixed core-pulling block 8 are reset.

[0061] It is understandable that a return spring 47 is provided between the first core-pulling base 12 and the fixed plate to meet the return requirement.

[0062] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A U-shaped elbow injection mold with segmented multiple core pulling, characterized by: It includes a panel and a bottom plate, a fixed template is arranged at the bottom of the panel, a fixed mold core is arranged at the bottom of the fixed template, a movable template is arranged at the top of the bottom plate, a movable mold core is arranged at the top of the movable template, the fixed mold core is arranged at the top of the movable mold core, a U-shaped mold cavity is arranged between the movable mold core and the fixed mold core, two openings of the mold cavity are arranged with fixed core pulling blocks, a plurality of movable core pulling blocks are sequentially clamped on the inner side of the fixed core pulling blocks, a driving mechanism is arranged at the end of the movable template, a protective plate is arranged at the top of the movable template, a first core pulling base is movably arranged inside the protective plate, the driving mechanism is connected to the first core pulling base, and the protective plate A second core-pulling base and a fixed plate are movably arranged inside the body, and the fixed plate is arranged between the first core-pulling base and the second core-pulling base, and follow-up springs are arranged on both sides of the fixed plate, and the follow-up springs are sequentially penetrated through the first core-pulling base, the fixed core-pulling block and a plurality of movable core-pulling blocks, a first buckle machine assembly mechanism is arranged between the first core-pulling base and the fixed plate, the bottom of the first core-pulling base is connected to two fixed core-pulling blocks, a second buckle machine assembly mechanism is arranged between the bottom of the fixed plate and the bottom of the second core-pulling base, and a third buckle machine assembly mechanism is arranged between the top of the fixed plate and the top of the second core-pulling base.

2. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 1, characterized in that: The first locking machine assembly mechanism includes a release rod and two movable blocks, the release rod is arranged at one end of the first core pulling base away from the mold cavity, a containing cavity is arranged in the fixed plate, springs are arranged on both sides of the containing cavity, the movable block is connected to the spring, an abutting inclined surface is arranged at the end of the movable block, a protrusion is arranged at the end of the release rod, the protrusion is arranged corresponding to the abutting inclined surface, a positioning groove is arranged in the middle of the movable block, and a locking rod is arranged at a section of the second core pulling base close to the first core pulling base, and the locking rod extends into the positioning groove.

3. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 2, characterized in that: A plurality of guide rods are arranged at one end of the second core-pulling base close to the first core-pulling base, and the guide rods are sequentially penetrated through the fixing plate and the first core-pulling base.

4. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 1, characterized in that: The second locking machine assembly mechanism includes a seesaw, a base is provided on the top of the movable template, a rotating shaft is provided on the base, the seesaw is provided on the top of the movable template, an abutment portion is provided at one end of the seesaw close to the first core-pulling base, a first locking buckle is provided at the other end of the seesaw, a first locking portion is provided at the bottom of the second core-pulling base, the first locking buckle is provided corresponding to the first locking portion, a release groove is provided at the bottom of the first core-pulling base, the release groove is provided corresponding to the abutment portion, an elastic push component is provided on the top of the movable template, and the elastic push component is located at the bottom of the abutment portion.

5. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 4, characterized in that: A long strip-shaped groove is opened on the top of the movable template, the base is arranged in the middle of the groove, and the rocker is located in the groove.

6. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 1, characterized in that: The third locking mechanism includes an insert rod and a second lock, the insert rod is arranged at one end of the first core-pulling base close to the fixed plate, the end of the insert rod is provided with a second buckle portion, the second lock is arranged at one end of the second core-pulling base close to the fixed plate, and the end of the second core-pulling base close to the fixed plate is provided with a buckle groove.

7. The U-shaped elbow injection mold with segmented and multiple core pulling according to claim 6 is characterized in that: A avoiding portion is arranged at the edge of the fixing plate, the insert rod is passed through the avoiding portion, and one end of the second locking buckle is rotatably connected to the second core-pulling base.

8. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 7, characterized in that: The inner wall of the protective plate is provided with an avoidance groove, and the avoidance groove is arranged corresponding to the second lock buckle.

9. The U-shaped elbow injection mold with segmented multiple core pulling according to claim 1, characterized in that: Square irons are arranged on both sides of the top of the bottom plate, the movable template is arranged on the top of the square irons, and an ejector mechanism is arranged on the top of the bottom plate, and the ejector mechanism is located at the bottom of the U-shaped mold cavity.

10. A core pulling method for a U-shaped elbow injection mold, characterized in that: The U-shaped elbow injection mold used in any one of claims 1 to 9 comprises the following steps: S100, when the first locking machine assembly and the second locking machine assembly are in effect, the driving mechanism drives the first core pulling base away from the mold cavity, the fixed plate and the second core pulling base remain in position, and the first core pulling base moves to drive the two fixed core pulling blocks to separate from the movable core pulling block; S200, the first locking machine assembly mechanism fails, the second locking machine assembly mechanism remains effective, the driving mechanism drives the first core pulling base to continue to move away from the mold cavity, the first core pulling base abuts against the fixed plate, the first core pulling base drives the fixed plate to move together, the conformal spring drives the multiple movable core pulling blocks to be partially pulled out, and the multiple movable core pulling blocks are separated from each other; S300, the second locking machine assembly fails, the third locking machine assembly changes from failure to effectiveness, the first core pulling base, the fixed plate and the second core pulling base are displaced synchronously, driving the fixed core pulling block and the movable core pulling block to completely pull the core; S400, reset to prepare for the next core pulling.

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