Ejection mechanism and injection molding device

Abstract

The utility model discloses an ejection mechanism and an injection molding device, and relates to the technical field of injection molding devices.The injection molding device comprises a rear mold assembly provided with an ejection hole, and the ejection mechanism movably penetrates through the ejection hole so as to eject an injection molding part out of the rear mold assembly; the ejector rod comprises a first section body and a second section body which are sequentially arranged in the ejection direction of the ejector rod, the second section body is used for limiting the ejector hole in the radial direction, and the cross section area of the first section body is smaller than that of the second section body so that the first section body can be arranged in the ejector hole in a swinging mode; according to the technical scheme, the ejection mechanism can be conveniently separated from the injection molding part.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding devices, in particular to an ejection mechanism and an injection molding device. Background Art

[0002] In the related art, when the injection molding device is injection molding deep-rib injection molded parts, part of the surface of the injection molded parts will be deformed during the molding process, so that the designed flatness requirements cannot be met, resulting in the mold being undercut. There is also a problem that the straight ejection mechanism of the injection molding device is easily stuck with the injection molded part, affecting the ejection of the injection molded part. Utility Model Content

[0003] The main purpose of the utility model is to provide an ejection mechanism and an injection molding device, aiming to provide an ejection mechanism which is convenient to be separated from an injection molded part.

[0004] To achieve the above-mentioned purpose, the ejection mechanism proposed in the utility model is applied to an injection molding device, wherein the injection molding device comprises a rear mold assembly having an ejection hole, and an ejection rod of the ejection mechanism is movably arranged in the ejection hole to eject the injection molded part from the rear mold assembly;

[0005] The ejector rod includes a first section and a second section sequentially arranged along the ejection direction thereof, the second section being used for radially limiting the ejection hole, and the cross-sectional area of ​​the first section is smaller than that of the second section so that the first section can be swingably arranged in the ejection hole.

[0006] In one embodiment, the ejection mechanism further comprises a guide sleeve, a guide hole is formed in the guide sleeve, and the central axis of the guide hole is used to be aligned with the central axis of the ejection hole;

[0007] The ejector rod is movably arranged in the guide hole, the cross-sectional area of ​​the first section is smaller than the cross-sectional area of ​​the guide hole, and the cross-sectional area of ​​the second section is matched with the guide hole.

[0008] In one embodiment, the guide sleeve comprises:

[0009] a guide portion, wherein the guide hole is formed in the guide portion; and

[0010] The fixing part is arranged on the side of the guide part and is used for fixing and matching with the rear mold assembly.

[0011] In one embodiment, at least two guide sleeves are provided, and at least two guide sleeves are sequentially spaced apart along the axial direction of the ejection rod.

[0012] In one embodiment, the ejection mechanism further includes a limiting member, which is located on the side of the ejection rod and is used to abut against one side of the first section to limit the swinging direction of the ejection mechanism.

[0013] In one embodiment, a limiting plane is formed on one side of the first segment, and the limiting plane is extended along the axial direction of the first segment;

[0014] The limiting member is held against the plane and is slidably connected to the plane.

[0015] In one embodiment, the ejector rod further includes a transition section connected between the first section and the second section;

[0016] The cross-sectional area of ​​the transition section gradually increases from the first section to the second section.

[0017] In one embodiment, the ejection mechanism further includes an ejection block, which is located at one end of the second segment body away from the first segment body and is provided with one of a positioning block and a positioning groove;

[0018] The other of the positioning block and the positioning groove is disposed at one end of the second section body away from the first section body, and the positioning block and the positioning groove are plug-fitted.

[0019] In one embodiment, the ejection mechanism further includes an ejector plate assembly, and the ejector plate assembly includes:

[0020] an ejector plate, the ejector plate being disposed at one end of the first section away from the second section and being used to drive the ejector rod to move up and down; and

[0021] A limiting column is arranged on one side of the ejector plate and is used to limit the ejection distance of the ejector plate.

[0022] The utility model also provides an injection molding device, comprising a rear mold assembly and an ejection mechanism as described in any one of the above, wherein the injection molding device comprises a rear mold assembly with an ejection hole, and an ejection rod of the ejection mechanism is movably arranged in the ejection hole to eject the injection molded part from the rear mold assembly;

[0023] The ejector rod includes a first section and a second section sequentially arranged along the ejection direction thereof, the second section being used for radially limiting the ejection hole, and the cross-sectional area of ​​the first section is smaller than that of the second section so that the first section can be swingably arranged in the ejection hole.

[0024] The ejection mechanism of the technical solution of the utility model is used to push the injection molded part upward through the ejection hole of the rear mold assembly after injection molding by the injection molding device, so as to realize the ejection and demolding of the injection molded part. Among them, the ejection rod of the ejection mechanism includes a first segment and a second segment arranged in sequence along its ejection direction. During the ejection process, the second segment and the first segment successively pass through the ejection hole. Since the second segment is used for radial positioning with the ejection hole, the ejection rod can normally push the injection molded part upward when the second segment enters the ejection hole, so that the injection molded part is ejected out of the cavity. Then, the first segment enters the ejection hole. Since the cross-sectional area of ​​the first segment is smaller than that of the second segment, it can be swingably arranged in the ejection hole. At this time, the ejection rod of the ejection mechanism can push the injection molded part upward while the second segment swings in the ejection hole to make the ejection rod shake as a whole, thereby effectively reducing the risk of the ejection mechanism getting stuck with the injection molded part, so as to facilitate the separation of the injection molded part and the ejection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A structural schematic diagram of an embodiment of an ejection mechanism provided by the utility model;

[0027] Figure 2 for Figure 1 A cross-sectional view of the ejector mechanism;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 A structural schematic diagram of an embodiment of an injection molding device provided by the utility model;

[0030] Figure 5 for Figure 4 Exploded view of the injection molding unit.

[0031] Description of Figure Numbers:

[0032] 100, injection molding device; 10, ejector mechanism; 11, ejector rod; 111, first section; 111a, limiting plane; 112, second section; 112a, positioning block; 113, transition section; 12, guide sleeve; 121, guide portion; 121a, guide hole; 122, fixing portion; 13, limiting member; 14, ejector block; 141, positioning groove; 15, ejector plate; 16, limiting column; 20, rear mold assembly.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] In the related art, when the injection molding device is injection molding deep-rib injection molded parts, part of the surface of the injection molded parts will be deformed during the molding process, so that the designed flatness requirements cannot be met, resulting in the mold being undercut. There is also a problem that the straight ejection mechanism of the injection molding device is easily stuck with the injection molded part, affecting the ejection of the injection molded part.

[0038] The utility model provides an ejection mechanism 10 applied to an injection molding device 100, wherein the injection molding device 100 comprises a rear mold assembly 20 with an ejection hole, and an ejection rod 11 of the ejection mechanism 10 is movably arranged in the ejection hole to eject the injection molded part from the rear mold assembly 20.

[0039] Specifically, see Figures 1 to 5 In one embodiment of the utility model, the ejection mechanism 10 includes a first segment 111 and a second segment 112 sequentially arranged along its ejection direction, the second segment 112 is used for radially limiting the ejection hole, and the cross-sectional area of ​​the first segment 111 is smaller than that of the second segment 112, so that it can be swingably arranged in the ejection hole.

[0040] The ejection mechanism 10 of the technical solution of the utility model is used to push the injection molded part upward through the ejection hole of the rear mold assembly 20 by the ejection rod 11 after injection molding by the injection molding device 100, so as to realize the ejection and demolding of the injection molded part. Among them, the ejection rod 11 of the ejection mechanism 10 includes a first segment 111 and a second segment 112 arranged in sequence along its ejection direction. During the ejection process, the second segment 112 and the first segment 111 successively pass through the ejection hole. Since the second segment 112 is used for radial positioning with the ejection hole, the ejection rod 11 can normally push the injection molded part upward when the second segment 112 enters the ejection hole, so that the injection molded part is ejected from the cavity. Then, the first section 111 enters the ejection hole. Since the cross-sectional area of ​​the first section 111 is smaller than that of the second section 112, the first section 111 can be swingably arranged in the ejection hole. At this time, the ejection rod 11 of the ejection mechanism 10 can push the injection-molded part upward while the second section 112 swings in the ejection hole to make the ejection rod 11 shake as a whole, thereby effectively reducing the risk of the ejection mechanism 10 getting stuck with the injection-molded part, so as to facilitate the separation of the injection-molded part and the ejection mechanism 10 from each other.

[0041] See also Figures 1 to 3 In an embodiment of the utility model, the ejection mechanism 10 further includes a guide sleeve 12, a guide hole 121a is formed in the guide sleeve 12, and the central axis of the guide hole 121a is used to be aligned with the central axis of the ejection hole;

[0042] The ejector rod 11 is movably disposed in the guide hole 121 a , the cross-sectional area of ​​the first section 111 is smaller than the cross-sectional area of ​​the guide hole 121 a , and the cross-sectional area of ​​the second section 112 is adapted to the guide hole 121 a .

[0043] Among them, by providing the guide sleeve 12, it is convenient to limit the ejector rod 11, so that the ejector rod 11 can be smoothly inserted into the ejection hole to realize the upward push of the injection molded part. In addition, by adjusting the size difference between the guide hole 121a of the guide sleeve 12 and the first section 111, the swing amplitude of the ejector rod 11 can also be controlled. It can be known that when the size difference between the inner diameter size of the guide hole 121a and the outer contour size of the first section 111 is larger, the shell swing amplitude of the ejector rod 11 is larger.

[0044] In some embodiments, the swing angle of the ejector rod 11 can be set to 0.21°, so that the ejector rod 11 can be separated from the injection molded part by swinging under the premise of realizing the normal ejection function of the ejection mechanism 10. Of course, the technical solution of the utility model is not limited to this, and the swing angle of the ejector rod 11 can also be set to 0 or other values. The specific implementation method can be set according to actual needs and is not limited here.

[0045] See also Figure 3 In an embodiment of the present utility model, the guide sleeve 12 comprises:

[0046] A guide portion 121, wherein the guide hole 121a is formed in the guide portion 121; and

[0047] The fixing portion 122 is disposed on the side of the guide portion 121 and is used for fixing and matching with the rear mold assembly 20 .

[0048] The guide portion 121 is a hollow sleeve structure, and the guide hole 121a in the above-mentioned embodiment is formed in the sleeve structure; one end of the fixing portion 122 is connected to the peripheral wall of the wire portion, and the other end protrudes toward the side of the guide portion 121, and is used for installation and cooperation with the rear mold assembly 20. In some embodiments, an ejection hole is formed in the rear mold assembly 20, and a fixing groove connected to the ejection hole is opened on the peripheral side of the ejection hole. The guide portion 121 can be placed in the ejection hole, and the fixing portion 122 can be placed in the fixing groove and connected to the groove wall of the fixing groove to achieve the installation and fixation of the guide sleeve 12. Specifically, the fixing portion 122 can be opened with a fixing hole, and can be connected to the groove wall of the fixing groove by fasteners such as screws penetrating through the fixing hole, so that the fixing portion 122 and the groove wall of the fixing groove can be detachably connected.

[0049] See also Figures 1 to 3 In the embodiment of the utility model, at least two guide sleeves 12 are provided, and at least two guide sleeves 12 are sequentially spaced apart along the axial direction of the ejector rod 11. Such arrangement is conducive to improving the limiting effect of the guide sleeve 12 on the ejector rod 11.

[0050] In some embodiments, two guide sleeves 12 are provided, and the rear mold assembly 20 includes a rear mold plate and a rear mold core stacked from bottom to top. The rear mold plate and the rear mold core are separately provided and limitedly matched, and the ejection hole is provided through the rear mold plate and the rear mold core. A fixing groove connected to the ejection hole is provided on the side of the rear mold plate facing the rear mold core, and one guide sleeve 12 is located on the side of the rear mold plate facing the rear mold core, so that its guide part 121 and fixing part 122 are respectively provided in the ejection hole and the fixing groove; another fixing groove connected to the ejection hole is provided on the side of the rear mold core facing the rear mold plate, and the other guide sleeve 12 is located on the side of the rear mold core facing the rear mold plate, so that its guide part 121 and fixing part 122 are respectively provided in the ejection hole and the fixing groove.

[0051] See also Figures 1 to 3 In an embodiment of the present utility model, the ejection mechanism 10 further includes a limiter 13 , which is located on the side of the ejection rod 11 and is used to abut against one side of the first section 111 to limit the swinging direction of the ejection mechanism 10 .

[0052] As known, the ejector rod 11 is usually centrally disposed in the guide hole 121a of the guide sleeve 12. When the first segment 111 is located in the guide hole 121a, since the cross-sectional area of ​​the first segment 111 is smaller than the cross-sectional area of ​​the guide hole 121a, there is a gap between the circumference of the first segment 111 and the guide hole 121a. At this time, by making the stopper 13 abut against one side of the first segment 111, the first segment 111 can be stopped from moving in the direction of the stopper 13, so that the swing direction of the ejection mechanism 10 can be limited to the direction away from the stopper 13.

[0053] See also Figure 3 In the embodiment of the present utility model, a limited position plane 111a is formed on one side of the first segment 111, and the limited position plane 111a is extended along the axial direction of the first segment 111;

[0054] The limiting member 13 is held against the plane and is slidably connected to the plane.

[0055] In some embodiments, the limiting member 13 is a rectangular block, which can be attached to the limiting plane 111a on the first segment 111. Such a configuration can facilitate a good fit between the limiting member 13 and the first segment 111.

[0056] Furthermore, in a feasible implementation, the limiting member 13 can also be set toward one side of the first section 111 and the outer contour of the first section 111, for example, so that the two opposite side surfaces form complementary concave and convex arc structures. The specific implementation method can be set according to actual needs and is not limited here.

[0057] See also Figure 3In an embodiment of the present utility model, the ejector rod 11 further includes a transition section 113 connected between the first section 111 and the second section 112;

[0058] The cross-sectional area of ​​the transition section 113 gradually increases from the first section 111 to the second section 112 .

[0059] In this way, the swing amplitude of the ejection rod 11 can be gradually changed during the ejection process, which is beneficial to improving the movement stability of the ejection mechanism 10 .

[0060] See also Figure 3 In an embodiment of the present utility model, the ejection mechanism 10 further includes an ejection block 14, which is located at one end of the second segment 112 away from the first segment 111 and is provided with one of a positioning block 112a and a positioning groove 141;

[0061] The second segment 112 is provided with one end away from the first segment 111 with the other of the positioning block 112a and the positioning groove 141, and the positioning block 112a and the positioning groove 141 are plug-fitted. Such a configuration is conducive to improving the position stability between the ejection block 14 and the ejection rod 11.

[0062] Furthermore, in some embodiments, the ejection mechanism 10 further includes a positioning pin and a retaining spring, wherein, in the insertion area of ​​the positioning block 112a and the positioning groove 141, the positioning pin is simultaneously arranged to penetrate the groove wall of the mounting block and the mounting groove, and the retaining spring is arranged at the end of the positioning pin, thereby achieving the installation and fixation of the ejection rod 11 and the ejection block 14. Of course, the technical solution of the utility model is not limited to this, and the ejection rod 11 and the ejection block 14 can also be installed and fixed in other ways, and the specific implementation method can be set according to actual needs, and is not limited here.

[0063] See also Figure 5 In an embodiment of the present utility model, the ejection mechanism 10 further includes an ejector plate 15 component, and the ejector plate 15 component includes:

[0064] an ejector plate 15, the ejector plate 15 being disposed at one end of the first segment 111 away from the second segment 112, and being used to drive the ejector rod 11 to move up and down; and

[0065] The limiting column 16 is disposed on one side of the ejector plate 15 and is used to limit the ejection distance of the ejector plate 15 .

[0066] Among them, by setting the limiting column 16, the ejection distance of the ejector plate 15 can be limited, and then the ejection distance of the ejector rod 11 can be limited, so as to prevent the ejection mechanism 10 from ejecting the injection molded part too much, so as to facilitate the user to remove the injection molded part in the injection molding device 100. In some embodiments, there can be multiple ejector plates 15, and the multiple ejector plates 15 are stacked in sequence along the ejection direction of the ejection mechanism 10; there can also be multiple limiting columns 16, and the multiple limiting columns 16 are arranged in sequence along the circumference of the ejector plate 15. The specific number of ejector plates 15 and limiting columns 16 can be set according to actual needs and is not limited here.

[0067] Specifically, in a feasible embodiment, the injection molding device 100 includes a bottom plate, and the rear mold assembly 20 and the bottom plate are spaced apart and are mounted above the bottom plate through a support member, which can be, but is not limited to, a square iron structure. The ejector plate 15 assembly is movably arranged between the bottom plate and the rear mold assembly 20. When the ejector plate 15 drives the ejection rod 11 to rise to eject the product, the limit column 16 rises synchronously with the ejector plate 15; when the limit plate rises to the limit position, it can abut against the bottom side of the rear mold assembly 20 to stop the ejector plate 15 from rising further, thereby limiting the ejection distance of the ejector plate 15.

[0068] The utility model further proposes an injection molding device 100, which includes a rear mold assembly 20 and an ejection mechanism 10. The specific structure of the ejection mechanism 10 refers to the above embodiment. Since the injection molding device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0069] In some embodiments, the injection molding device 100 further includes a guide post, which is disposed between the rear mold assembly 20 and the bottom plate of the aforementioned embodiment, and the ejector plate 15 of the ejector plate 15 assembly is provided with a guide post through hole, so that the ejector plate 15 can be sleeved on the guide post through the guide post through hole, so that the ejector plate 15 can reciprocate along the extension direction of the guide post. The provision of the guide post is conducive to ensuring the movement stability of the ejection mechanism 10.

[0070] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An ejection mechanism, applied to an injection molding device, characterized in that: The injection molding device comprises a rear mold assembly having an ejection hole, and an ejection rod of the ejection mechanism is movably arranged in the ejection hole to eject the injection molded part from the rear mold assembly; The ejector rod includes a first section and a second section sequentially arranged along the ejection direction thereof, the second section being used for radially limiting the ejection hole, and the cross-sectional area of ​​the first section is smaller than that of the second section so that the first section can be swingably arranged in the ejection hole.

2. The ejection mechanism according to claim 1, characterized in that: The ejection mechanism further comprises a guide sleeve, a guide hole is formed in the guide sleeve, and the central axis of the guide hole is used to be aligned with the central axis of the ejection hole; The ejector rod is movably arranged in the guide hole, the cross-sectional area of ​​the first section is smaller than the cross-sectional area of ​​the guide hole, and the cross-sectional area of ​​the second section is matched with the guide hole.

3. The ejection mechanism according to claim 2, characterized in that: The guide sleeve comprises: a guide portion, wherein the guide hole is formed in the guide portion; and The fixing part is arranged on the side of the guide part and is used for fixing and matching with the rear mold assembly.

4. The ejection mechanism according to claim 2, characterized in that: At least two guide sleeves are provided, and at least two guide sleeves are arranged in sequence and spaced apart along the axial direction of the ejection rod.

5. The ejection mechanism according to any one of claims 1 to 4, characterized in that: The ejection mechanism further includes a limiting member, which is located on the side of the ejection rod and is used to abut against one side of the first section body to limit the swinging direction of the ejection mechanism.

6. The ejection mechanism according to claim 5, characterized in that: A limiting plane is formed on one side of the first segment, and the limiting plane is extended along the axial direction of the first segment; The limiting member is held against the plane and is slidably connected to the plane.

7. The ejection mechanism according to any one of claims 1 to 4, characterized in that: The ejector rod further includes a transition section connected between the first section and the second section; The cross-sectional area of ​​the transition section gradually increases from the first section to the second section.

8. The ejection mechanism according to any one of claims 1 to 4, characterized in that: The ejection mechanism further includes an ejection block, which is located at one end of the second segment body away from the first segment body and is provided with one of a positioning block and a positioning groove; The other of the positioning block and the positioning groove is disposed at one end of the second section body away from the first section body, and the positioning block and the positioning groove are plug-fitted.

9. The ejection mechanism according to any one of claims 1 to 4, characterized in that: The ejection mechanism further includes an ejector plate assembly, and the ejector plate assembly includes: an ejector plate, the ejector plate being disposed at one end of the first section away from the second section and being used to drive the ejector rod to move up and down; and A limiting column is arranged on one side of the ejector plate and is used to limit the ejection distance of the ejector plate.

10. An injection molding device, characterized in that: It comprises a rear mold assembly and an ejection mechanism as claimed in any one of claims 1 to 9.

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