Secondary core-pulling ejection mold

Abstract

The utility model discloses a secondary core-pulling ejection mold, and relates to the technical field of injection molds, the mold comprises a front mold and a rear mold, the front mold comprises a panel and a plate A which are stacked, the rear mold comprises a plate B, mold feet and a bottom plate which are sequentially stacked, and the plate B is connected with the bottom plate through the mold feet; an ejection mechanism is arranged on the plate B and comprises a push plate, a connecting mechanism, a secondary ejection mechanism and a reset mechanism; a rear mold core is arranged in the push plate; a plurality of inserts are arranged on the plate B; the secondary ejection mechanism is connected with the push plate through a connecting mechanism; and the reset mechanism is connected with the secondary ejection mechanism. In the process that the ejection mechanism ejects the formed product, the push plate enables the formed product to be separated from the insert in the rear mold core firstly, the action enables the follow-up action that the ejector pin ejects the formed product for the second time to become easier, the formed product is separated from the mold more easily, and then the ejector pin stretches into the rear mold core in the push plate, so that the formed product is separated from the mold more easily. And a formed product in the rear mold core is completely ejected out of the rear mold core.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a secondary core-pulling ejection mold. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding are fast production speed, high efficiency, automated operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into complex-shaped parts. Injection molding is suitable for mass production and complex-shaped products and other molding and processing fields.

[0003] At present, the development trend of injection molds is mainly towards high-precision and high-tech. The injection molding process can be roughly divided into several processes: mold closing, glue injection, pressure holding, cooling, mold opening, and product removal.

[0004] However, some existing injection molds have the problem that the molded product is not easy to separate from the mold core during the mold opening process, which will lead to a decrease in product manufacturing efficiency.

[0005] Therefore, a secondary core-pulling ejection mold is proposed. Utility Model Content

[0006] The utility model aims to overcome the shortcomings of the prior art and provide a secondary core-pulling ejection mold.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A secondary core-pulling ejection mold comprises a front mold and a rear mold, wherein the front mold comprises a panel and an A plate which are stacked, a front mold core is arranged in the A plate, an injection port which is connected to the interior of the front mold core is opened on the panel, and the rear mold comprises a B plate, a mold foot and a bottom plate which are stacked in sequence, and the B plate and the bottom plate are connected through the mold foot; an ejection mechanism is arranged on the B plate, and the ejection mechanism comprises a push plate, a connecting mechanism, a secondary ejection mechanism and a reset mechanism, a side wall of the B plate away from the bottom plate is provided with a plurality of guide rods, and the push plate is slidably connected with the plurality of guide rods; a rear mold core is arranged in the push plate, and the push plate abuts against the A plate after the rear mold is molded with the front mold; a plurality of inserts are arranged on the B plate, and any insert extends into the rear mold core; the secondary ejection mechanism is located between the bottom plate and the B plate, and the secondary ejection mechanism and the push plate are connected through the connecting mechanism; the reset mechanism is connected with the secondary ejection mechanism, and is used for resetting the push plate and the secondary ejection mechanism.

[0009] Furthermore, in the utility model, the secondary ejection mechanism includes a top plate and a plurality of ejector pins arranged on the top plate, the top plate is located between the bottom plate and the B plate, and any of the ejector pins can extend into the rear mold core after passing through the B plate; the top plate and the push plate are connected by the connecting mechanism; and the reset mechanism is arranged on the top plate.

[0010] Furthermore, in the utility model, the above-mentioned connecting mechanism is divided into two groups, and the two groups of the above-mentioned connecting mechanism are symmetrically arranged on both sides of the above-mentioned top plate. Any of the above-mentioned connecting mechanisms includes a push rod arranged on the side of the above-mentioned top plate, a buckle plate arranged on the side of the above-mentioned B plate and a spring block arranged on the side of the above-mentioned push plate. The extension direction of the above-mentioned push rod is the same as the moving direction of the above-mentioned push plate, and the above-mentioned push rod is penetrated by the above-mentioned buckle plate; a countersunk hole is opened on the side of the above-mentioned push plate, and the above-mentioned spring block is slidably arranged in the above-mentioned countersunk hole, and the sliding direction of the above-mentioned spring block is perpendicular to the moving direction of the above-mentioned push plate. A spring is arranged at the bottom of the above-mentioned countersunk hole, and the above-mentioned spring is connected to the above-mentioned spring block. A first inclined surface is arranged on the end of the above-mentioned spring away from the above-mentioned spring; a second inclined surface adapted to the above-mentioned first inclined surface is arranged on the above-mentioned buckle plate; when the above-mentioned secondary ejection mechanism is not ejected, the above-mentioned first inclined surface abuts against the above-mentioned second inclined surface, and the free end of the above-mentioned push rod abuts against the above-mentioned spring block.

[0011] Furthermore, in the utility model, the above-mentioned reset mechanism includes several groups of reset parts, and any of the above-mentioned reset parts includes a reset spring, a reset rod and a limit ring. One end of the above-mentioned reset rod is connected to the above-mentioned top plate, and the other end is successively penetrated through the above-mentioned B plate and the above-mentioned push plate. The central axis of the above-mentioned reset rod is parallel to the moving direction of the above-mentioned push plate, and the above-mentioned limit ring is arranged on the free end of the above-mentioned reset rod; the above-mentioned reset spring is sleeved on the above-mentioned reset rod, and one end of the above-mentioned reset spring is connected to the above-mentioned top plate, and the other end is connected to the above-mentioned B plate.

[0012] The beneficial effects of the utility model are:

[0013] The utility model provides a secondary core-pulling ejection mold. By designing an ejection mechanism in a rear mold, the ejection mechanism pushes a plate in the process of ejecting a molded product so that the molded product is first separated from an insert in a rear mold core. This action makes it easier for a subsequent ejector pin to eject the molded product for a secondary time, making it easier for the molded product to separate from the mold. Then the ejector pin extends into the rear mold core in the push plate to completely eject the molded product in the rear mold core out of the rear mold core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the rear mold of an embodiment of the utility model;

[0016] Figure 3 A cross-sectional view of a rear mold of an embodiment of the utility model;

[0017] Figure 4 A cross-sectional view of a rear mold of an embodiment of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the connecting mechanism of an embodiment of the utility model.

[0019] In the figure: 101-panel; 102-A plate; 103-injection port; 201-B plate; 202-mold foot; 203-bottom plate; 204-push plate; 205-guide rod; 206-rear mold core; 207-insert; 208-top plate; 209-throw pin; 2010-throw rod; 2011-buckle plate; 2012-spring block; 2013-spring; 2014-reset spring; 2015-reset rod; 2016-limiting ring; 301-molded product. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments to clearly and completely describe the technical solution 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 those skilled in the art without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 , the utility model provides a technical solution:

[0022] A secondary core-pulling ejection mold comprises a front mold and a rear mold, the front mold comprises a stacked panel 101 and an A plate 102, the A plate 102 is provided with a front mold core, the panel 101 is provided with an injection port 103 connected to the interior of the front mold core, the rear mold comprises a B plate 201, a mold foot 202 and a bottom plate 203 stacked in sequence, the B plate 201 and the bottom plate 203 are connected by the mold foot 202; an ejection mechanism is arranged on the B plate 201, the ejection mechanism comprises a push plate 204, a connecting mechanism, a secondary ejection mechanism and a reset mechanism, a side wall of the B plate 201 away from the bottom plate 203 is provided with a plurality of guide rods 205, the push plate 204 is slidably connected to the plurality of guide rods 205, and in this embodiment, there are four guide rods 205. A rear mold core 206 is arranged in the push plate 204, and after the rear mold and the front mold are closed, the push plate 204 abuts against the A plate 102; a plurality of inserts 207 are arranged on the B plate 201, and any insert 207 extends into the rear mold core 206; the secondary ejection mechanism is located between the bottom plate 203 and the B plate 201, and the secondary ejection mechanism and the push plate 204 are connected by a connecting mechanism; the reset mechanism is connected to the secondary ejection mechanism, and is used for resetting the push plate 204 and the secondary ejection mechanism.

[0023] Specifically, the secondary ejection mechanism includes a top plate 208 and a plurality of ejector pins 209 arranged on the top plate 208. The top plate 208 is located between the bottom plate 203 and the B plate 201. Any ejector pin 209 can extend into the rear mold core 206 after passing through the B plate 201. The top plate 208 and the push plate 204 are connected by a connecting mechanism. The reset mechanism is arranged on the top plate 208.

[0024] Specifically, there are two groups of connecting mechanisms, which are symmetrically arranged on both sides of the top plate 208. Any connecting mechanism includes a top rod 2010 arranged on the side of the top plate 208, a gusset plate 2011 arranged on the side of the B plate 201, and a spring block 2012 arranged on the side of the push plate 204. The extension direction of the top rod 2010 is the same as the moving direction of the push plate 204. The top rod 2010 is penetrated by the gusset plate 2011; a countersunk hole is opened on the side of the push plate 204, and the spring block 2012 The sliding block 2012 is arranged in the countersunk hole, and the sliding direction of the spring block 2012 is perpendicular to the moving direction of the push plate 204. A spring 2013 is arranged at the bottom of the countersunk hole, and the spring 2013 is connected to the spring block 2012. A first inclined surface is arranged at the end of the spring block 2012 away from the spring 2013; a second inclined surface adapted to the first inclined surface is arranged on the buckle plate 2011; when the secondary ejection mechanism does not eject, the first inclined surface abuts against the second inclined surface, and the free end of the ejector rod 2010 abuts against the spring block 2012.

[0025] In this embodiment, the reset mechanism includes four groups of reset parts, and any reset part includes a reset spring 2014, a reset rod 2015 and a limit ring 2016. One end of the reset rod 2015 is connected to the top plate 208, and the other end is successively penetrated through the B plate 201 and the push plate 204. The central axis of the reset rod 2015 is parallel to the moving direction of the push plate 204, and the limit ring 2016 is arranged on the free end of the reset rod 2015; the reset spring 2014 is sleeved on the reset rod 2015, and one end of the reset spring 2014 is connected to the top plate 208, and the other end is connected to the B plate 201.

[0026] Working principle:

[0027] During injection molding, the mold is in a mold-closing state (the front mold and the rear mold are closed together), and then the injection molding machine injects liquid plastic into the mold core (the mold core includes a front mold core and a rear mold core 206, the front mold core is installed in the A plate 102, and the rear mold core 206 is installed in the push plate 204. After the front mold and the rear mold are closed, the front mold core and the rear mold core 206 form a complete mold core) through the injection port 103 on the front mold panel 101, and the mold is opened after the liquid plastic is formed. During the mold opening process, the front mold does not move, and the rear mold moves. The rear mold is separated from the front mold under the control of the corresponding driving mechanism on the injection molding machine. After the rear mold is separated from the front mold, the molded product 301 is in the rear mold core 206 in the push plate 204.

[0028] The ejection process begins when the rear mold is completely separated from the front mold. Before ejection, the free end of the ejector pin 2010 abuts against the spring block 2012, and the first inclined surface of the spring block 2012 is in full contact with the second inclined surface of the buckle plate 2011. During ejection, the top plate 208 moves toward the push plate 204 under the push of the ejection device of the injection molding machine, and the return spring 2014 connected to the top plate 208 is compressed during this process. During the movement of the top plate 208 toward the push plate 204, since the ejector pin 2010 is fixed on the top plate 208, the free end of the ejector pin 2010 abuts against the spring block 2012, and the spring block 2012 fixed on the push plate 204 abuts against the ejector pin 2010 under the action of the elastic force. The existence of this structure enables the push plate 204 and the top plate 208 to move synchronously (eject) during ejection. During the movement of the push plate 204, the push plate 204 first separates the molded product 301 from the insert 207 in the rear mold core 206. This action makes it easier for the subsequent ejector pin 209 to eject the molded product 301 for the second time. During the synchronous movement of the ejector plate 208 and the push plate 204, the thrust of the ejector pin 2010 acts on the spring block 2012. During the ejection process, there is an extrusion force between the second inclined surface of the pinch plate 2011 and the first inclined surface of the spring block 2012. One of the components of this extrusion force acts on the spring block 2012, so that the spring block 2012 is pressed back into the push plate 204. When the spring block 2012 separates from the pinch plate 2011, the ejector pin 2010 also separates from the spring block 2012. At this time, the push plate 204 stops moving, but the ejector plate 208 continues to eject.

[0029] During the ejection of the ejector plate 208, the ejector pin 209 extends into the rear mold core 206 in the push plate 204, and the molded product 301 in the rear mold core 206 is completely ejected from the rear mold core 206. The molded product 301 completely separated from the rear mold core 206 is taken away by a matching robot.

[0030] Finally, the corresponding ejection device of the injection molding machine is reset and retracted (the ejection device does not eject the top plate 208). At this time, the top plate 208 is reset under the action of the reset spring 2014 (the top plate 208 moves toward the bottom plate 203). During the reset process of the top plate 208, the reset rod 2015 on the top plate 208 will move synchronously with the top plate 208. After the limit ring 216 installed on the free end of the reset rod 2015 abuts against the push plate 204, the push plate 204 moves under the pull of the reset rod 2015. After the push plate 204 is reset, it fits with the B plate 201. After the top plate 208 and the push plate 204 are reset in place, the first inclined surface of the spring block 2012 and the second inclined surface of the buckle plate 2011 are always in abutment. Finally, the rear mold moves to close the mold with the front mold, and the injection molding of the next batch of products begins.

[0031] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A secondary core-pulling ejection mold, comprising a front mold and a rear mold, wherein the front mold comprises a stacked face plate (101) and an A plate (102), a front mold core is arranged inside the A plate (102), and an injection port (103) communicating with the interior of the front mold core is opened on the face plate (101), characterized in that: The rear mold comprises a B plate (201), a mold foot (202) and a bottom plate (203) which are stacked in sequence, and the B plate (201) and the bottom plate (203) are connected via the mold foot (202); an ejection mechanism is arranged on the B plate (201), and the ejection mechanism comprises a push plate (204), a connection mechanism, a secondary ejection mechanism and a reset mechanism; a side wall of the B plate (201) away from the bottom plate (203) is provided with a plurality of guide rods (205), and the push plate (204) is slidably connected to the plurality of guide rods (205); the push plate (204) is provided with a plurality of guide rods (205); A rear mold core (206) is provided, and after the rear mold and the front mold are closed, the push plate (204) abuts against the A plate (102); a plurality of inserts (207) are provided on the B plate (201), and any insert (207) extends into the rear mold core (206); the secondary ejection mechanism is located between the bottom plate (203) and the B plate (201), and the secondary ejection mechanism and the push plate (204) are connected via the connecting mechanism; the reset mechanism is connected to the secondary ejection mechanism, and is used for resetting the push plate (204) and the secondary ejection mechanism.

2. A secondary core-pulling ejection mold according to claim 1, characterized in that: The secondary ejection mechanism comprises a top plate (208) and a plurality of ejector pins (209) arranged on the top plate (208); the top plate (208) is located between the bottom plate (203) and the B plate (201); any of the ejector pins (209) can extend into the rear mold core (206) after passing through the B plate (201); the top plate (208) and the push plate (204) are connected via the connecting mechanism; and the reset mechanism is arranged on the top plate (208).

3. A secondary core-pulling ejection mold according to claim 2, characterized in that: The connecting mechanism is in two groups, and the two groups of connecting mechanisms are symmetrically arranged on both sides of the top plate (208). Any of the connecting mechanisms comprises a top rod (2010) arranged on the side of the top plate (208), a buckle plate (2011) arranged on the side of the B plate (201), and a spring block (2012) arranged on the side of the push plate (204). The extension direction of the top rod (2010) is the same as the movement direction of the push plate (204). The top rod (2010) is penetrated by the buckle plate (2011). A countersunk hole is opened on the side of the push plate (204). The spring block (2012) slides The push plate (204) is movably arranged in the counterbore, the sliding direction of the spring block (2012) is perpendicular to the moving direction of the push plate (204), a spring (2013) is arranged at the bottom of the counterbore, the spring (2013) is connected to the spring block (2012), and a first inclined surface is arranged at one end of the spring block (2012) away from the spring (2013); a second inclined surface adapted to the first inclined surface is arranged on the buckle plate (2011); when the secondary ejection mechanism is not ejecting, the first inclined surface abuts against the second inclined surface, and the free end of the ejector rod (2010) abuts against the spring block (2012).

4. A secondary core-pulling ejection mold according to claim 3, characterized in that: The reset mechanism comprises a plurality of reset components, any of which comprises a reset spring (2014), a reset rod (2015) and a limit ring (2016); one end of the reset rod (2015) is connected to the top plate (208), and the other end is sequentially passed through the B plate (201) and the push plate (204); the central axis of the reset rod (2015) is parallel to the moving direction of the push plate (204); and the limit ring (2016) is arranged at the free end of the reset rod (2015); the reset spring (2014) is sleeved on the reset rod (2015); one end of the reset spring (2014) is connected to the top plate (208), and the other end is connected to the B plate (201).

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