A kind of inner core-pulling mechanism of lawn lamp shell injection mold

Abstract

The present application relates to injection mold technical field, specifically, it is a kind of lawn lamp shell injection mold's inner core-pulling mechanism, including respectively upper and lower settings and mutually cooperate the movable mold core and the fixed mold core, set in the rear of fixed mold core's guide frame, along the front and back direction sliding connection in guide frame's slider, fixed on the rear side outer wall of guide frame's core-pulling oil cylinder, and two transverse fixed in slider front side and left and right symmetrical settings and both movably inserted between movable mold core and fixed mold core's core column;Between each core column and guide frame, still be equipped with an inner core-pulling module, inner core-pulling module includes sliding and elastically inserted in the lower side of core column to always have upward movement reset tendency's core block, rectangular slot hole is set on the front and back two sides outer wall of core block;The structure and processing steps of the present application are relatively simple, while manufacturing difficulty and failure probability.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more specifically, to an internal core-pulling mechanism for an injection mold of a lawn lamp housing. Background Technology

[0002] Lawn lights are outdoor lighting fixtures installed in low-lying areas such as lawns and green belts, serving both auxiliary lighting and landscape decoration functions. To facilitate low-cost mass production and lightweight design, the housing and most other accessories of lawn lights are made of plastic; and the production of plastic parts must rely on matching injection molds.

[0003] Because the inner wall of the lawn light housing has recesses and holes for installing accessories, an internal core-pulling mechanism is required in the injection mold. Existing internal core-pulling mechanisms require a large number of parts, resulting in a complex structure. Furthermore, multiple processing steps are needed to accommodate these parts, making the processing steps cumbersome. Additionally, a significant amount of time is required for the installation and debugging of the parts, making the manufacturing process difficult and increasing the probability of malfunctions. Therefore, a solution is urgently needed. Summary of the Invention

[0004] In view of the current state of the prior art, the technical problem to be solved by the present invention is to provide an inner core pulling mechanism for the injection mold of lawn lamp housing that is relatively simple in structure and processing steps, and does not require a lot of time for installation and debugging, thereby reducing the manufacturing difficulty and the probability of failure.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an internal core-pulling mechanism for a lawn lamp housing injection mold, comprising a moving mold core and a fixed mold core respectively arranged vertically and cooperating with each other, a guide frame located behind the fixed mold core, a slider slidably connected in the guide frame in the front-back direction, a core-pulling cylinder fixed on the outer wall of the rear side of the guide frame, and two core columns laterally fixed on the front side of the slider and symmetrically arranged on the left and right, both of which are movably inserted between the moving mold core and the fixed mold core. The telescopic end of the core-pulling cylinder extends laterally forward into the interior of the guide frame and is fixed on the slider.

[0006] Each of the core columns and the guide frame is also provided with an inner core-pulling module. The inner core-pulling module includes a core block that slides in the vertical direction and is elastically inserted into the lower side of the core column so as to always have an upward movement and reset tendency. Rectangular slots are opened on the outer walls of the front and rear sides of the core block.

[0007] The inner core-pulling module also includes a traction column horizontally disposed on the lower side inside the rectangular slot, a traction shaft horizontally and rotatably inserted and connected in the slider, and a traction motor fixed on the outer wall of the rear side of the guide frame. The front end of the traction shaft extends into the interior of the rectangular slot and is eccentrically fixed to the rear end of the traction column. The rotation shaft of the traction motor is horizontally forward and concentrically fixed to the rear end of the traction shaft.

[0008] Preferably, the center distance 'a' between the traction shaft and the traction column is not greater than the vertical distance 'b' between the lower inner wall of the rectangular slot and the lower outer wall of the core block.

[0009] Preferably, the radius d of the traction column is slightly larger than the vertical distance c between the central axis of the traction shaft and the inner wall of the rectangular slot on the side closest to it.

[0010] Preferably, the inner core-pulling module further includes a push pin that slides in the vertical direction and is elastically inserted into the end of the core block so as to always have an upward resetting tendency, and the upper end of the push pin extends into the lower side of the inner side of the rectangular slot.

[0011] Preferably, a limiting groove is provided on the lower outer circumferential surface of the traction column, located above the ejector pin, and the upper end of the ejector pin forms a bent section in the direction of the central axis of the traction column, the end of the bent section extending movably into the limiting groove.

[0012] Preferably, an involute arc surface is formed on the bottom surface of each of the limiting grooves, and the end of the bent section slides and elastically fits against the involute arc surface.

[0013] Preferably, the edge on the involute arc surface that has the minimum distance from the center of the traction column is located close to the traction shaft.

[0014] Preferably, the limiting groove is limited to the lower half of the traction column, and the angle e between the starting and ending edges of the involute arc surface and the central axis of the traction column is 120 degrees to 150 degrees.

[0015] Compared with the prior art, the advantages of the present invention are as follows: The present invention has a simple structure and can achieve the same internal core-pulling effect with fewer parts. Moreover, it only requires two processing steps: grooving and drilling of the core post. Therefore, the processing steps are relatively simple. At the same time, it does not require a lot of time for installation and debugging, which reduces the manufacturing difficulty and the probability of failure. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings: Figure 1 This is an exploded view of the right front side of the present invention; Figure 2 This is an exploded top view of the right front side of the core post and inner core-pulling module of the present invention. Figure 3 This is a front view of the radial cross-section of the inner core-pulling module of the present invention when the core block and ejector pin are not moved downwards; Figure 4 This is the invention Figure 3 A magnified view of the structure at point A; Figure 5 This is a front view of the radial cross-section of the inner core-pulling module of the present invention when the core block and ejector pin begin to move downward; Figure 6 This is a front view of the radial cross-section of the inner core-pulling module of the present invention when the core block and ejector pin are lowered to the bottom. Detailed Implementation

[0017] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0018] It should be understood that the various steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown, and the scope of this application is not limited in this respect.

[0019] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the relevant definitions of other terms will be given in the description below.

[0020] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] like Figures 1 to 6As shown, an internal core-pulling mechanism for an injection mold of a lawn lamp housing includes a moving mold core 6 and a fixed mold core 5 that are respectively arranged vertically and cooperate with each other, a guide frame 7 located behind the fixed mold core 5, a slider 1 that is slidably connected in the guide frame 7 in the front-back direction, a core-pulling cylinder 2 fixed on the rear outer wall of the guide frame 7, and two core columns 3 that are laterally fixed in front of the slider 1 and symmetrically arranged on the left and right, and are movably inserted between the moving mold core 6 and the fixed mold core 5. The telescopic end of the core-pulling cylinder 2 extends laterally forward into the interior of the guide frame 7 and is fixed on the slider 1.

[0023] Each core post 3 is also provided with an inner core-pulling module 4 between it and the guide frame 7. The inner core-pulling module 4 includes a core block 41 that slides in the up and down direction and is elastically inserted into the lower side of the core post 3 so that it always has the tendency to move upward and reset. Rectangular slots 411 are opened on the outer walls of the front and rear sides of the core block 41.

[0024] The inner core-pulling module 4 also includes a traction column 42 horizontally disposed inside the lower side of the rectangular slot 411, a traction shaft 44 horizontally and rotatably inserted into the slider 1, and a traction motor 45 fixed on the rear outer wall of the guide frame 7. The front end of the traction shaft 44 extends into the interior of the rectangular slot 411 and is eccentrically fixed to the rear end of the traction column 42. The rotation shaft of the traction motor 45 is horizontally forward and concentrically fixed to the rear end of the traction shaft 44. In addition to allowing the traction column 42 to rotate, the rectangular slot 411 can also save material to achieve weight reduction.

[0025] The center distance a between the traction shaft 44 and the traction column 42 is not greater than the vertical distance b between the lower inner wall of the rectangular slot 411 and the lower outer wall of the core block 41. The radius d of the traction column 42 is slightly greater than the vertical distance c between the central axis of the traction shaft 44 and the inner wall of the rectangular slot 411 on the adjacent side.

[0026] Working principle of chip 41: After the moving mold core 6 and the fixed mold core 5 are assembled together, the telescopic end of the drive core-pulling cylinder 2 extends outward to push the two core pillars 3 forward with the help of the slider 1 until they are fully inserted between the moving mold core 6 and the fixed mold core 5 (existing technology).

[0027] Then, the traction motor 45 in each inner core-pulling module 4 is activated to rotate its rotating shaft. This, in turn, drives the traction column 42 to rotate counterclockwise eccentrically within the rectangular slot 411 in the core block 41 via the traction shaft 44. The outer circumference of the traction column 42 slides downward, pressing against the lower inner wall of the rectangular slot 411, thus moving the core block 41 downward until the outer wall of the traction column 42, originally located on the left side, rotates and fits against the right inner wall of the rectangular slot 411. Since the radius d of the traction column 42 is slightly larger than that of the traction shaft... The vertical distance c between the central axis of 44 and the inner wall of the rectangular slot 411 is such that the traction column 42 cannot continue to rotate, thus achieving automatic limiting. At this time, the end of the core block 41 extends into the cavity of the fixed mold core 5. Since the center distance a between the traction shaft 44 and the traction column 42 is not greater than the vertical distance b between the lower inner wall of the rectangular slot 411 and the lower outer wall of the core block 41, the interior of the rectangular slot 411 will not be connected with the cavity of the fixed mold core 5, so the molten material will not enter the rectangular slot 411.

[0028] Before demolding, the rotation shaft of the traction motor 45 in each inner core-pulling module 4 is reversed to drive the traction column 42 to rotate clockwise eccentrically. The core block 41 will move upward with its own rebound force until its end retracts into the core column 3.

[0029] The inner core-pulling module 4 also includes a push pin 43 that slides in the vertical direction and is elastically inserted into the end of the core block 41 so as to always have an upward resetting tendency. The upper end of the push pin 43 extends into the lower side of the inner side of the rectangular slot 411.

[0030] A limiting groove 421 is provided on the lower outer circumferential surface of the traction column 42, located above the ejector pin 43. The upper end of the ejector pin 43 forms a bent section 431 in the direction of the central axis of the traction column 42, and the end of the bent section 431 extends into the limiting groove 421.

[0031] An involute arc surface 422 is formed on the bottom surface of the limiting groove 421, and the end of the bent section 431 slides and elastically fits onto the involute arc surface 422.

[0032] The edge of the involute curved surface 422, which is at its minimum distance from the center of the traction column 42, is positioned close to the traction shaft 44.

[0033] The limiting groove 421 is confined to the lower half of the traction column 42, and the angle e between the starting and ending edges of the involute arc surface 422 and the central axis of the traction column 42 is 120 degrees to 150 degrees.

[0034] A rectangular groove 31 is provided on the lower outer wall of the core column 3, and the core block 41 slides along the vertical direction and is elastically inserted into the rectangular groove 31.

[0035] Working principle of ejector pin 43: As the traction column 42 rotates counterclockwise eccentrically, the involute arc surface 422 presses down and to the right against the end of the bent section 431, thereby forcing the ejector pin 43 to move downward. As the ejector pin 43 moves downward simultaneously with the core block 41, it gradually extends downward to below the end of the core block 41, until the outer wall of the traction column 42, which was originally located on the left side, rotates and fits against the inner wall of the right side of the rectangular slot 411. At this time, the end of the bent section 431 has moved to the outer wall of the upper half of the traction column 42. When the end of the bent section 431 moves to the vertical midline of the traction column 42, the ejector pin 43 is at the maximum downward position.

[0036] When the left edge of the root of the bent section 431 is always higher than the lower inner wall of the rectangular slot 411, it will not hinder the downward movement of the ejector pin 43, and can also play a limiting role to prevent the ejector pin 43 from falling out downward.

[0037] During demolding, when the traction column 42 rotates clockwise eccentrically, the ejector pin 43 moves upward with its own rebound force, so that the end of the bent section 431 returns to the involute arc surface 422 and slides in the opposite direction along the involute arc surface 422, so that the end of the ejector pin 43 gradually moves upward until its end retracts into the core block 41. During this process, the core block 41 itself also moves upward. When the right inner wall of the limiting groove 421, that is, the inner wall on the side where the edge of the involute arc surface 422 with the minimum center distance from the traction column 42 is located, is blocked by the end of the bent section 431, the traction column 42 can no longer rotate. The end of the bent section 431 plays a limiting role in the clockwise eccentric reversal of the traction column 42.

[0038] The present invention has a simple structure and can achieve the same internal core-pulling effect with fewer parts. Moreover, it only requires two processing steps, namely grooving and drilling, on the core post 3. Therefore, the processing steps are relatively simple. At the same time, it does not require a lot of time for installation and debugging, which reduces the manufacturing difficulty and the probability of failure.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An internal core-pulling mechanism for an injection mold of a lawn lamp housing, comprising a movable mold core and a fixed mold core respectively arranged vertically and cooperating with each other, a guide frame disposed behind the fixed mold core, a slider slidably connected in the guide frame in a front-rear direction, a core-pulling cylinder fixed on the rear outer wall of the guide frame, and two core pillars laterally fixed in front of the slider and symmetrically arranged on the left and right, both movably inserted between the movable mold core and the fixed mold core, wherein the telescopic end of the core-pulling cylinder extends laterally forward into the interior of the guide frame and is fixed on the slider, characterized in that: Each of the core columns and the guide frame is also provided with an inner core-pulling module. The inner core-pulling module includes a core block that slides in the vertical direction and is elastically inserted into the lower side of the core column so as to always have an upward movement and reset tendency. Rectangular slots are opened on the outer walls of the front and rear sides of the core block. The inner core-pulling module also includes a traction column horizontally disposed on the lower side inside the rectangular slot, a traction shaft horizontally and rotatably inserted and connected in the slider, and a traction motor fixed on the outer wall of the rear side of the guide frame. The front end of the traction shaft extends into the interior of the rectangular slot and is eccentrically fixed to the rear end of the traction column. The rotation shaft of the traction motor is horizontally forward and concentrically fixed to the rear end of the traction shaft. The inner core-pulling module also includes a push pin that slides in the vertical direction and is elastically inserted into the end of the core block so as to always have an upward resetting tendency. The upper end of the push pin extends into the lower side of the inner side of the rectangular slot. A limiting groove is provided on the lower outer circumferential surface of the traction column, located above the ejector pin. The upper end of the ejector pin has a bent section in the direction of the central axis of the traction column, and the end of the bent section extends movably into the limiting groove. An involute arc surface is formed on the bottom surface of each of the limiting grooves, and the end of the bent section slides and elastically fits against the involute arc surface. The edge on the involute arc surface with the minimum distance from the center of the traction column is located close to the traction shaft.

2. The inner core-pulling mechanism of the injection mold for a lawn light housing according to claim 1, characterized in that, The center distance 'a' between the traction shaft and the traction column is not greater than the vertical distance 'b' between the lower inner wall of the rectangular slot and the lower outer wall of the core block.

3. The inner core-pulling mechanism of the injection mold for a lawn light housing according to claim 1, characterized in that, The radius d of the traction column is slightly larger than the vertical distance c between the central axis of the traction shaft and the inner wall of the rectangular slot on the side closest to it.

4. The inner core-pulling mechanism of the injection mold for a lawn light housing according to claim 1, characterized in that, The limiting groove is confined to the lower half of the traction column, and the angle e between the starting and ending edges of the involute arc surface and the central axis of the traction column is 120 degrees to 150 degrees.

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