Demolding assembly of injection mold

Abstract

The invention relates to a demolding assembly of an injection mold. The demolding assembly comprises an ejection mechanism and a pin hole release mechanism which are matched with each other, the ejection mechanism comprises a seat block, a base block fixed to the top of the seat block, a guide block arranged above the base block and a push rod vertically and movably arranged in the seat block and the base block in a penetrating mode. The ejection mechanism further comprises an ejector pin which is vertically and movably arranged in the seat block, the base block and the guide block in a penetrating mode. The ejection mechanism further comprises a U-shaped base embedded in the bottom of the base block and a driving block rotationally connected to the interior of the U-shaped base. The pin hole releasing mechanism comprises two side blocks which are symmetrically arranged front and back, a sliding block which is movably arranged between the two side blocks and has a left-right translation function, and a square guide column which is obliquely arranged in the sliding block in a penetrating manner; according to the ejection mechanism, the demolding difficulty is reduced, parts of the ejection mechanism do not need to be changed, and time and labor are saved; in addition, the structure is simplified, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more particularly to a demolding component for an injection mold. Background Technology

[0002] Injection molds are tools used to process and mold plastic products. They enable mass production by giving plastics specific shapes and precise dimensions, and are widely used in the automotive, home appliance, and electronics industries. The core structure of an injection mold includes a moving module, a stationary module, a gating system, a cooling system, and an ejection mechanism. The demolding mechanism of an injection mold is a device used to remove the molded plastic part from the mold during the injection molding process, ensuring that the plastic part automatically detaches from the stationary module without damage. The demolding mechanism mainly includes ejector pins, sliders, guide pillars, and spring pins.

[0003] The ejector pins in existing demolding mechanisms have short ejection distances, leading to some plastic parts sticking to the mold due to structural and material issues. Specifically, the bonding force between the plastic part and the fixed mold block is strong and the bonding surface is deep, preventing the ejector pins from completely ejecting the plastic part. This makes demolding difficult and can only be solved by increasing the stroke of the ejector mechanism, but this involves many components and is time-consuming and labor-intensive. Furthermore, the pin hole axis on some plastic parts is at a certain angle to the sliding block's movement direction, and the spring pin on the sliding block is inserted into the pin hole. Therefore, during mold parting, the sliding block cannot be directly driven away from the plastic part. A cylinder or hydraulic cylinder must be used to achieve two-stage, opposite-directional movement of the sliding block, causing the spring pin to leave the pin hole first, and then the sliding block to leave the plastic part. However, this results in a complex structure and high manufacturing costs, requiring urgent solutions. 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 a demolding component for injection molds that reduces demolding difficulty, saves time and effort, simplifies the structure and reduces costs.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a demolding component for an injection mold, characterized in that it includes an ejection mechanism and a pin hole release mechanism that cooperate with each other; The ejection mechanism includes a seat block, a base block fixed to the top of the seat block, a guide block located above the base block, and a push rod that is vertically and movably inserted into the seat block and the base block, with the upper end of the push rod fixed to the bottom of the guide block. The ejection mechanism also includes ejector pins that are vertically and movably interposed in the seat block, base block, and guide block; The ejection mechanism also includes a U-shaped seat embedded in the bottom of the seat block and a drive block rotatably connected inside the U-shaped seat. The lower corner of the drive block facing the ejector pin cooperates with the bottom inner wall of the U-shaped seat. A notch is formed at the upper corner of the drive block facing the ejector pin. Two symmetrically arranged locking blocks are formed on the inner wall of the notch facing the ejector pin. The ejector pin is movably inserted between the two locking blocks. The head of the ejector pin is movably located in the notch and below the two locking blocks. An extension block is formed outward on the side of the drive block facing the push rod. The extension block is located below the push rod and cooperates with the lower end of the push rod.

[0006] Preferably, the pin hole release mechanism includes two side blocks arranged symmetrically front to back, a slider movably disposed between the two side blocks to have left and right translation function, and a square guide post obliquely inserted in the slider.

[0007] Preferably, the pin hole release mechanism further includes a pressure block disposed above the slider and two inclined spring pins that are elastically inserted into the slider so as to always have a tendency to move towards the pressure block for resetting. The two spring pins are respectively arranged one in front of the other and parallel to each other. The upper ends of the two spring pins are both facing the pressure block. A locking slope is formed at the bottom corner of the pressure block, which cooperates with the upper part of the two spring pins.

[0008] Preferably, the slider has inclined square through holes, and the square guide post is inserted into the square through holes. The vertical distance between the inner walls of the left and right sides of the square through holes is greater than the vertical distance between the outer walls of the left and right sides of the square guide post.

[0009] Preferably, the upper end of the square guide post has a vertically arranged separation section, and correspondingly, the right edge of the upper opening of the square through hole has a vertically arranged limiting surface, which cooperates with the right outer wall of the separation section.

[0010] Preferably, the top of the slider is also fixed with two symmetrical limiting blocks located on the front and rear sides of the pressure block and respectively to the right of the two spring needles, and the left side of each of the two limiting blocks forms a stop block in the direction of one spring needle on the same side.

[0011] Preferably, a limiting slope is formed at the lower corner of the ends of both stops, and the two limiting slopes respectively cooperate with the upper part of the two spring pins.

[0012] Compared with the prior art, the advantages of the present invention are as follows: This invention increases the ejection distance of the ejector pin by adding a U-shaped seat, a drive block, and a push rod, and by utilizing the lever principle. This allows for the smooth, fast, and complete ejection of plastic parts that are sticking to the mold, thus reducing the difficulty of demolding. Moreover, it does not require modification of the ejection mechanism components, saving both time and effort. In addition, the separation section on the square guide post enables the two-stage counter-directional movement of the slider, eliminating the need for a cylinder or hydraulic cylinder, thereby simplifying the structure and reducing costs. Attached Figure Description

[0013] 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 a front exploded view of the present invention; Figure 2 This is a front view of the ejector pin of the present invention when the drive block is not rotating; Figure 3 This is a front view of the ejector pin of the present invention when the drive block rotates; Figure 4 This is a structural diagram of the right front side of the pin hole release mechanism of the present invention; Figure 5 This is a front cross-sectional view of the pin hole release mechanism of the present invention; Figure 6 This is a front cross-sectional view of the two spring pins of the present invention during mold closing; Figure 7 This is a front cross-sectional view of the two spring pins of the present invention during mold parting. Detailed Implementation

[0014] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0015] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0016] like Figures 1-7 As shown, a demolding assembly for an injection mold includes an ejection mechanism 4 and a pin hole release mechanism 5 that cooperate with each other. The ejection mechanism 4 includes a seat block 41, a base block 42 fixed to the top of the seat block 41, a guide block 43 located above the base block 42, and a push rod 47 vertically and movably interposed in the seat block 41 and the base block 42, with the upper end of the push rod 47 fixed to the bottom of the guide block 43. The ejection mechanism 4 also includes ejector pins 44 that are vertically and movably interposed in the seat block 41, base block 42 and guide block 43; The ejection mechanism 4 also includes a U-shaped seat 45 embedded in the bottom of the seat block 41 and a drive block 46 rotatably connected inside the U-shaped seat 45. The lower corner of the drive block 46 facing the ejector pin 44 cooperates with the bottom inner wall of the U-shaped seat 45. A notch 461 is formed at the upper corner of the side of the drive block 46 facing the ejector pin 44. Two locking blocks 462 are formed on the inner wall of the notch 461 facing the ejector pin 44. The ejector pin 44 is movably inserted between the two locking blocks 462. The head of the ejector pin 44 is movably located in the notch 461 and below the two locking blocks 462. An extension block 463 is formed outward on the side of the drive block 46 facing the push rod 47. The extension block 463 is located below the push rod 47 and cooperates with the lower end of the push rod 47.

[0017] The pin release mechanism 5 includes two side blocks 51 arranged symmetrically front to back, a slider 52 movably disposed between the two side blocks 51 to have left and right translation function, and a square guide post 54 obliquely inserted in the slider 52.

[0018] The pin release mechanism 5 also includes a pressure block 55 located above the slider 52 and two inclined spring pins 56 that are elastically inserted into the slider 52 so as to always have a tendency to move back towards the pressure block 55. The two spring pins 56 are arranged in front and behind and parallel to each other. The upper ends of the two spring pins 56 are both facing the pressure block 55. A locking inclined surface 551 is formed at the bottom corner of the pressure block 55, which cooperates with the upper part of the two spring pins 56.

[0019] The slider 52 has inclined square through holes 521, and the square guide post 54 is inserted in the square through hole 521. The vertical distance between the inner walls of the left and right sides of the square through hole 521 is greater than the vertical distance between the outer walls of the left and right sides of the square guide post 54.

[0020] The upper end of the square guide post 54 has a vertically arranged separation section 541. Correspondingly, the right edge of the upper opening of the square through hole 521 has a vertically arranged limiting surface 522. The limiting surface 522 cooperates with the right outer wall of the separation section 541.

[0021] The top of the slider 52 is also fixed with two symmetrical limiting blocks 57 located on the front and rear sides of the pressure block 55 and respectively to the right of the two spring needles 56. The left side of each of the two limiting blocks 57 forms a stop block 571 facing the spring needle 56 on the same side.

[0022] Each of the two stops 571 has a limiting slope 572 formed at the lower corner of its end, and the two limiting slopes 572 cooperate with the upper part of the two spring pins 56 respectively.

[0023] Working principle: The guide block 43 in the ejection mechanism 4 is embedded and fixed inside the fixed module 2 in the injection mold. The seat block 41 in the ejection mechanism 4 is fixed to the ejection mechanism in the injection mold and located between the fixed module 2 and the base plate 3 in the injection mold. The two side blocks 51 in the pin hole release mechanism 5 are fixed to the fixed module 2 in the injection mold facing the moving module. The pressure block 55 is fixed to the moving module 1 in the injection mold facing the fixed module 2. Finally, the end of the separation section 541 on the square guide post 54 is fixed to the moving module 1 in the injection mold with the help of the base 53.

[0024] When the moving module 1 in the injection mold moves toward the fixed module 2 and they fit together, the molten material enters the cavity between the moving module 1 and the fixed module 2 through the sprue provided in the moving module 1 to complete the injection molding. After cooling, the injection molded part 6 is formed (existing technology).

[0025] Initially, the upper ends of both spring pins 56 are higher than the corresponding outer wall of the slider 52, causing the lower ends of both spring pins 56 to retract into the slider 52. When the moving module 1 and the fixed module 2 are closed, the locking inclined surface 551 on the pressure block 55 moves downward, forcing the two spring pins 56 to tilt downward, thus causing the lower ends of both spring pins 56 to extend outside the slider 52. Therefore, after the injection molded part 6 is formed, the lower ends of the two spring pins 56 will form two pin holes 61 on the injection molded part 6, and the lower ends of the two spring pins 56 are respectively inserted into the two pin holes 61. At this time, the root of the separating section 541 is located in the square through hole 521. During mold separation, the moving module 1 gradually moves away from the fixed module 2, thereby driving the square guide post 54 to move upward. Since the root of the separating section 541 is located in the square through hole 521, When the square guide post 54 begins to move, the root of the separating section 541 moves vertically, so it does not force the slider 52 to move, that is, the slider 52 remains stationary. However, the pressure block 55 moves upward with the moving module 1, thereby causing the locking ramp 551 to leave the upper ends of the two spring pins 56. Since both spring pins 56 have an elastic reset function, the lower ends of both spring pins 56 will retract back into the slider 52 and leave the two pin holes 61. Afterward, when the main body of the square guide post 54 enters the square through hole 521, it will force the slider 52 to move to the right to leave the injection molded part 6, thus successfully releasing the locking of the lower ends of the two spring pins 56. However, when the upper part of the two spring pins 56 contacts the limiting ramp 572 on the two stops 571, the upper ends of the two spring pins 56 reach the limit position.

[0026] In the mold-closed state, the upper end of the ejector pin 44 is retracted into the guide block 43. During mold opening, the ejector mechanism is driven to move upward so that the base block 42 and the U-shaped seat 45 move synchronously with the help of the seat block 41. The side of the drive block 46 facing the ejector pin 44 first swings downward until its lower corner is attached to the bottom inner wall of the U-shaped seat 45. Then it will support the head of the ejector pin 44 and move upward, so that the upper end of the ejector pin 44 gradually extends above the guide block 43, thereby gradually pushing the injection molded part 6 outward. However, the ejection distance is relatively short and cannot completely push away the injection molded part 6 with a large degree of sticking. The feature of this invention is that the seat block 41 and the base block 42 gradually approach the guide block 43 when they move upward, so that the lower end of the push rod 47 gradually passes through the seat block 41 and the base block 43. 2. When the lower end of the push rod 47 contacts the extension block 463, it will press down on the extension block 463 to force the extension block 463 to swing downward, thereby causing the notch 461 on the drive block 46 to swing upward. By using the lever principle, the bottom inner wall of the notch 461 is used to force the ejector pin 44 to continue to move upward a certain distance, thus increasing the ejection distance of the ejector pin 44, thereby completely ejecting the injection molded part 6 with a large degree of sticking to the mold from the fixed module 2. After the ejection is completed, the ejection mechanism moves downward to drive the U-shaped seat 45 to move downward in the same way, until the bottom of the seat block 41 contacts the bottom plate 3. Then, with the help of the two locking blocks 462 on the drive block 46, the head of the ejector pin 44 is forced to move downward, thereby causing the upper end of the ejector pin 44 to retract back into the guide block 43.

[0027] This invention increases the ejection distance of the ejector pin by adding a U-shaped seat 45, a drive block 46, and a push rod 47, and by utilizing the lever principle. This allows for the smooth, fast, and complete ejection of plastic parts that stick to the mold, thus reducing the difficulty of demolding. Moreover, it does not require modification of the ejection mechanism components, saving both time and effort. In addition, the separation section 541 on the square guide post 54 enables the two-stage opposite movement of the slider, eliminating the need for a cylinder or hydraulic cylinder, thereby simplifying the structure and reducing costs.

[0028] 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. A demolding assembly for an injection mold, characterized in that, This includes a mutually cooperating ejection mechanism and a pin-hole release mechanism; The ejection mechanism includes a seat block, a base block fixed to the top of the seat block, a guide block located above the base block, and a push rod that is vertically and movably inserted into the seat block and the base block, with the upper end of the push rod fixed to the bottom of the guide block. The ejection mechanism also includes ejector pins that are vertically and movably interposed in the seat block, base block, and guide block; The ejection mechanism also includes a U-shaped seat embedded in the bottom of the seat block and a drive block rotatably connected inside the U-shaped seat. The lower corner of the drive block facing the ejector pin cooperates with the bottom inner wall of the U-shaped seat. A notch is formed at the upper corner of the drive block facing the ejector pin. Two symmetrically arranged locking blocks are formed on the inner wall of the notch facing the ejector pin. The ejector pin is movably inserted between the two locking blocks. The head of the ejector pin is movably located in the notch and below the two locking blocks. An extension block is formed outward on the side of the drive block facing the push rod. The extension block is located below the push rod and cooperates with the lower end of the push rod.

2. The demolding assembly for an injection mold according to claim 1, characterized in that, The pin release mechanism includes two side blocks arranged symmetrically front to back, a slider movably disposed between the two side blocks to have left and right translation function, and a square guide post inclinedly inserted in the slider.

3. The demolding assembly for an injection mold according to claim 2, characterized in that, The pin release mechanism also includes a pressure block located above the slider and two inclined spring pins that are elastically inserted into the slider so as to always have a tendency to move towards the pressure block. The two spring pins are respectively arranged one in front of the other and parallel to each other. The upper ends of the two spring pins are both facing the pressure block. A locking slope is formed at the bottom corner of the pressure block, which cooperates with the upper part of the two spring pins.

4. A demolding assembly for an injection mold according to claim 2, characterized in that, The slider has inclined square through holes, and the square guide post is inserted into the square through holes. The vertical distance between the inner walls of the left and right sides of the square through holes is greater than the vertical distance between the outer walls of the left and right sides of the square guide post.

5. A demolding assembly for an injection mold according to claim 4, characterized in that, The upper end of the square guide post has a vertically arranged separation section. Correspondingly, the right edge of the upper opening of the square through hole has a vertically arranged limiting surface, which cooperates with the right outer wall of the separation section.

6. A demolding assembly for an injection mold according to claim 3, characterized in that, The top of the slider is also fixed with two symmetrical limiting blocks located on the front and rear sides of the pressure block and to the right of the two spring needles respectively. The left side of each of the two limiting blocks forms a stop block in the direction of one of the spring needles on the same side.

7. A demolding assembly for an injection mold according to claim 6, characterized in that, A limiting slope is formed at the lower corner of the ends of both stops, and the two limiting slopes cooperate with the upper part of the two spring pins respectively.

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