Intra-cavity gas quick exhaust mechanism for reducing injection molding period of injection mold

Abstract

The utility model discloses a quick exhaust mechanism for gas in an injection mold cavity capable of reducing an injection period, which relates to the technical field of injection molds and comprises a lower mold, a plurality of uniformly distributed exhaust mechanisms are arranged in the middle of the lower mold and used for exhausting gas in the injection mold, and the exhaust mechanisms are used for exhausting gas in the injection mold. Gas in a final injection molding part cavity at the upper part of the lower mold can quickly enter the exhaust cavity through the gas inlet groove, an inner tightening structure at the lower part of the exhaust cavity enables the gas to enter the compression cavity through the gas outlet pipeline, and along with the increase of the gas content in the compression cavity, the piston is pushed to move, so that gas exhaust is realized; the defects that bubbles, shrinkage cavities and the like are easily generated on the surface of the final forming part of an epitaxial plate or a frame under the condition that the exhaust hole of the lower mold is closed when the epitaxial plate or the frame is subjected to injection molding at present can be effectively overcome, the product percent of pass is remarkably improved, and meanwhile, the injection molding efficiency can be improved under the condition that gas is rapidly exhausted.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, concretely is injection mold cavity gas fast exhaust mechanism of reducing injection period. BACKGROUND

[0002] Injection mold is composed of two parts of upper mold and lower mold, the upper mold is installed on the moving template of injection molding machine, the lower mold is installed on the fixed template of injection molding machine, the upper mold and the lower mold are closed to constitute the gating system and the cavity when injection molding, the upper mold and the lower mold are separated to take out the plastic product when opening the mold.

[0003] Reference patent document: patent publication number CN209350821U, patent publication date 2019-09-06, provide a kind of injection mold with in-mold exhaust mechanism, including upper die assembly, lower die assembly and exhaust assembly, exhaust assembly is slidably arranged on upper die assembly or lower die assembly, upper die assembly includes upper die core and upper die holder, lower die assembly includes lower die core and lower die holder, when upper die core and lower die core are matched and set, closed injection piece cavity can be formed, exhaust assembly includes spring and exhaust insert, exhaust insert is slidably arranged in upper die core or lower die core, by setting exhaust assembly in upper die core or lower die core, when injecting molten raw material into injection piece cavity, the gas in injection piece cavity is sequentially passed through exhaust groove, exhaust passage two and exhaust passage one and quickly discharged to the outside, to reduce the resistance of gas when filling molten raw material, realize the rapid filling of raw material, to reduce the formation of injection defects such as weld line, improve the quality of injection piece.

[0004] Based on the search of patent number, in combination with the deficiencies in prior art:

[0005] The exhaust way of injection mold in prior art is mostly traditional exhaust hole, exhaust groove design, or through setting exhaust gap on mold parting surface to realize gas exhaust, but when injecting products with special structure such as outer extension plate or frame, due to the gas at the outer extension part or frame edge of these products is difficult to be quickly exhausted through conventional exhaust structure in the last stage of injection molding, when mold exhaust hole is closed, residual gas is trapped in mold cavity, under the action of high-pressure injection plastic, product surface appears bubble, shrinkage hole and other defects, seriously affect product appearance and performance.

[0006] Therefore, the utility model provides injection mold cavity gas fast exhaust mechanism of reducing injection period. Utility model content

[0007] In order to solve the conventional exhaust structure of injection mold contains the extension plate or frame product in the structure of the molded part, because the gas of the last molding site is difficult to be quickly discharged, leading to the bubble, shrinkage and other defects caused by difficult gas, affecting the appearance and performance of the product; The utility model discloses a purpose to provide the fast exhaust mechanism of the gas in the cavity of injection mold during the injection period.

[0008] In order to achieve the above object, the utility model discloses a fast exhaust mechanism of the gas in the cavity of injection mold during the injection period, including lower mould, the middle part of lower mould is equipped with a plurality of evenly distributed exhaust mechanism, is used for discharging the gas in the injection mold, the exhaust mechanism includes:

[0009] The telescopic assembly includes a plurality of air inlet cavities opened in the upper part of the lower mold, a plurality of exhaust cavities are opened in the middle part of the lower mold, a sliding rod is slidably arranged in the middle part of each of the plurality of exhaust cavities, a sealing plug is fixedly installed at the top end of each of the plurality of sliding rods, each of the plurality of sealing plugs is slidably arranged in the middle part of the air inlet cavity, a sliding roller is fixedly installed at the bottom end of each of the plurality of sliding rods, a plurality of sliding cavities are opened in the lower part of the lower mold, a sliding block is slidably arranged in the middle part of each of the plurality of sliding cavities, and the lower part of each of the plurality of sliding rollers is in contact with the upper surface of the sliding block.

[0010] A plurality of compression cavities are opened in the side of the lower mold close to the sliding cavity, a piston is slidably arranged in the middle part of each of the plurality of compression cavities, a plurality of gas outlet pipelines are fixedly installed at the lower part of the lower mold, a check valve is installed in the middle part of each of the plurality of gas outlet pipelines, the plurality of check valves are configured to allow gas to flow from the exhaust cavity to the compression cavity only, and the two ends of each of the plurality of gas outlet pipelines are in sealed communication with the exhaust cavity and the compression cavity respectively.

[0011] The restoring assembly is arranged on one side of the piston and is used for restoring the telescopic assembly.

[0012] Preferably, the restoring assembly includes two springs fixedly installed on one side of the piston, the other end of each of the two springs is fixedly installed on one side of the compression cavity, two symmetrically distributed telescopic rods are fixedly installed on one side of the middle part of each of the plurality of compression cavities, one end of each of the plurality of pistons is fixedly installed on the telescopic rod, a plurality of gas outlet cavities are opened in one side of the lower part of the lower mold, and each of the plurality of gas outlet cavities is in communication with the compression cavity.

[0013] Preferably, the upper part of each of the plurality of sliding rods is fixedly installed with two symmetrically distributed sliding rings, a plurality of uniformly distributed exhaust holes are opened in the upper part of each of the plurality of sliding rings, and each of the plurality of sliding rings is slidably arranged in the middle part of the exhaust cavity.

[0014] Preferably, the bottom end of each of the plurality of sliding blocks is fixedly installed with a sliding block, a groove is opened in the lower part of each of the plurality of sliding cavities, and each of the plurality of sliding blocks is slidably arranged in the inside of the groove.

[0015] Preferably, the plurality of exhaust cavities are in communication with the sliding cavity, and the lower part of the plurality of exhaust cavities is in an inwardly-tightened structure.

[0016] Preferably, the upper part of the lower mold is provided with a plurality of uniformly-distributed air inlet grooves in communication with the air inlet cavity.

[0017] Advantages

[0018] The utility model discloses a gas fast exhaust mechanism in injection mold cavity reduces injection period. Compared with prior art has the following advantages:

[0019] 1, the gas in the cavity of the last injection molding part of the upper part of the lower mold can be quickly entered into the exhaust cavity through the air inlet groove, and the inwardly-tightened structure of the lower part of the exhaust cavity makes the gas enter into the compression cavity through the air outlet pipeline, with the increase of the gas content in the compression cavity, the piston is moved, the gas is discharged, the surface of the epitaxial plate or the frame is prevented from generating bubbles, shrinkage holes and other defects under the condition that the exhaust hole of the lower mold is closed when the product is injected to the epitaxial plate or the frame, the product qualified rate is significantly improved, and the injection efficiency can be improved under the condition that the gas is quickly discharged.

[0020] 2, after the injection part is taken out, the elastic restoring force of the spring drives the piston to reset, the air outlet cavity cooperates to adjust the internal pressure, ensures that the piston normally moves, in the piston reset process, the sliding block is extruded, the sliding rod is driven to rise by the cooperation of the inclined surface and the sliding roller, the sealing plug returns to the upper part of the air inlet cavity, prepares for the next injection, and part of the colloid in the air inlet cavity can be pushed out, so that the automatic reset of the exhaust mechanism is realized, and the stability and reliability of the exhaust mechanism in the continuous injection process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of the utility model.

[0022] Figure 2 It is a section structure schematic view of the utility model.

[0023] Figure 3 It is a structure schematic view of the utility model. Figure 2 It is an enlarged view of A in the utility model.

[0024] Figure 4 It is another section structure schematic view of the utility model.

[0025] Figure 5 It is an enlarged view of B in the utility model. Figure 4

[0026] Figure 6 It is a sliding rod structure schematic view of the utility model.​

[0027] Figure 7 For the utility model Figure 6 Enlarged view of C.

[0028] In the figure: 1, the lower mold; 2, exhaust mechanism;21, telescopic component;211, sliding rod;2111, sliding ring;2112, exhaust hole;2113, exhaust cavity;212, sealing plug;2121, air inlet cavity;2122, air inlet groove;213, sliding block;2131, sliding roller;2132, sliding block;2133, sliding cavity;214, air outlet pipeline;2141, check valve;215, compression cavity;216, piston;22, recovery component;221, spring;222, telescopic rod;223, air outlet cavity. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] Please refer to Figures 1-7 The utility model provides a technical scheme: reduce the injection mold cavity gas fast exhaust mechanism of injection period, including lower mold 1, the middle part of lower mold 1 is equipped with multiple evenly distributed exhaust mechanism 2, for the gas exhaust in injection mold, exhaust mechanism 2 includes:

[0031] Telescopic component 21 includes multiple air inlet cavities 2121 opened in the upper part of lower mold 1, the middle part of lower mold 1 is equipped with multiple exhaust cavities 2113, the middle part of multiple exhaust cavities 2113 is slidably provided with sliding rod 211, the top end of multiple sliding rods 211 is fixedly installed with sealing plug 212, multiple sealing plugs 212 are slidably provided in the middle part of air inlet cavity 2121, the bottom end of multiple sliding rods 211 is fixedly installed with sliding roller 2131, the lower part of lower mold 1 is equipped with multiple sliding cavities 2133, the middle part of multiple sliding cavities 2133 is slidably provided with sliding block 213, and the lower part of multiple sliding rollers 2131 is in contact with the upper surface of sliding block 213;

[0032] The lower mold 1 is provided with a plurality of compression cavities 215 on one side close to the sliding cavity 2133, the middle part of each compression cavity 215 is slidingly clamped with a piston 216, the lower part of the lower mold 1 is fixedly installed with a plurality of gas outlet pipes 214, the middle part of each gas outlet pipe 214 is installed with a check valve 2141, the plurality of check valves 2141 are configured to allow gas to flow only from the exhaust cavity 2113 to the compression cavity 215, and the two ends of each gas outlet pipe 214 are in sealed communication with the exhaust cavity 2113 and the compression cavity 215 respectively, the above-mentioned intake cavity 2121, exhaust cavity 2113, sliding cavity 2133, gas outlet pipe 214 and compression cavity 215 are in communication with each other, and the volume of the compression cavity 215 is greater than the volume of the sliding cavity 2133, which can ensure sufficient thrust to reset the sealing plug 212.

[0033] The restoring assembly 22 is arranged on one side of the piston 216 and is used for restoring the telescopic assembly 21.

[0034] The restoring assembly 22 includes two springs 221 fixedly installed on one side of the piston 216, the other end of each spring 221 is fixedly installed on one side of the compression cavity 215, the middle part of each compression cavity 215 is fixedly installed with two symmetrically distributed telescopic rods 222, one end of each piston 216 is fixedly installed on one end of the telescopic rod 222, the telescopic rod 222 can make the piston 216 move more stably in the compression cavity 215, and the lower part of the lower mold 1 is provided with a plurality of gas outlet cavities 223, each gas outlet cavity 223 is in communication with the compression cavity 215.

[0035] The upper part of each sliding rod 211 is fixedly installed with two symmetrically distributed sliding rings 2111, the upper part of each sliding ring 2111 is provided with a plurality of uniformly distributed exhaust holes 2112, and each sliding ring 2111 is slidingly clamped in the middle part of the exhaust cavity 2113, the exhaust cavity 2113 is slightly thicker than the sliding rod 211 by setting the sliding ring 2111 and the exhaust hole 2112, and the sliding rod 211 can stably slide up and down in the exhaust cavity 2113 by the support of the sliding ring 2111, and the gas can be discharged through the exhaust hole 2112 and enter the compression cavity 215 through the gas outlet pipe 214.

[0036] The bottom end of each sliding block 213 is fixedly installed with a sliding block 2132, the lower part of each sliding cavity 2133 is provided with a groove, and each sliding block 2132 is slidingly clamped in the groove, and the groove and the sliding block 2132 can limit the sliding block 213, so that the sliding block 213 moves more stably in the sliding cavity 2133.

[0037] The plurality of exhaust cavities 2113 are in communication with the sliding cavity 2133, the lower part of the plurality of exhaust cavities 2113 is in a retracted structure, so that the lowermost part of the exhaust cavity 2113 is in contact with the outer surface of the sliding rod 211, so that the gas cannot continue to enter the sliding cavity 2133 when reaching the lowermost part of the exhaust cavity 2113, and the gas can only enter the compression cavity 215 directly through the gas outlet pipe 214.

[0038] The upper part of the lower mold 1 is provided with a plurality of uniformly distributed air inlet grooves 2122, which are in communication with the air inlet cavity 2121, so that the structure is wide at the top and narrow at the bottom through the cooperation of the air inlet cavity 2121 and the exhaust cavity 2113, so that the gas can enter the exhaust cavity 2113 through the air inlet groove 2122, and when the sealing plug 212 reaches the lower surface of the air inlet cavity 2121, the exhaust cavity 2113 is blocked by the wide-top-narrow-bottom structure, so that the gas and the colloid cannot enter the inside through the air inlet groove 2122.

[0039] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0040] When working, the upper mold and the lower mold 1 are in contact and closed to inject inwardly, when the injection reaches the last stage, the colloid for injection reaches the upper part of the cavity, the air in the cavity enters the exhaust cavity 2113 through the air inlet groove 2122, the gas is discharged through the exhaust hole 2112, and the gas enters the compression cavity 215 through the gas outlet pipe 214, so that the gas content in the compression cavity 215 increases, and the piston 216 moves to one side, the space on one side of the piston 216 increases, and the gas is collected, and the space on the other side decreases under the movement of the piston 216, the spring 221 is extruded, so that the gas on this side is discharged from the gas outlet cavity 223, until the colloid is completely injected into the upper part of the mold, at this time, part of the colloid enters the exhaust cavity 2113, and under the pressure difference, the sealing plug 212 is moved downward at the same time, so that the sealing plug 212 reaches the lower surface of the air inlet cavity 2121, and the exhaust cavity 2113 is blocked, so that the gas in the lower mold 1 cannot be discharged from the exhaust cavity 2113;

[0041] After the injection molding part is taken off, the pressure on the sealing plug 212 is released, so that the piston 216 can move to one side under the action of the spring 221, and at the same time, the gas enters the side of the piston 216 where the spring 221 is installed, so as to ensure that the internal pressure difference does not increase, and the normal movement of the piston 216 is ensured, so that the piston 216 moves to one side, so that the pressure on the other side of the piston 216 increases, thereby pressing the sliding block 213 to move to one side along the groove, and the upper surface of the sliding block 213 is inclined, so that the sliding block 213 can move while driving the sliding rod 211 to move upward through the sliding roller 2131, thereby enabling the sealing plug 212 to reach the upper part of the air inlet cavity 2121 for next use, and at the same time, the gel in the air inlet cavity 2121 can be pushed out.

[0042] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] Although the embodiments of the present application have been shown and described, it is to be understood that for the purpose of the present application, the changes, modifications, replacements, and variations of the embodiments can be made by those skilled in the art without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A rapid gas venting mechanism for reducing gas flow in the injection mold cavity during the injection molding process, comprising a lower mold (1), characterized in that: The lower mold (1) has multiple evenly distributed venting mechanisms (2) in its middle section for venting gas from the injection mold. The venting mechanisms (2) include: The telescopic assembly (21) includes multiple air inlet chambers (2121) opened on the upper part of the lower mold (1), multiple exhaust chambers (2113) opened in the middle of the lower mold (1), a sliding rod (211) is slidably engaged in the middle of each of the multiple exhaust chambers (2113), a sealing plug (212) is fixedly installed at the top of each of the multiple sliding rods (211), the multiple sealing plugs (212) are slidably engaged in the middle of the air inlet chambers (2121), a sliding roller (2131) is fixedly installed at the bottom of each of the multiple sliding rods (211), multiple sliding chambers (2133) are opened in the lower part of the lower mold (1), a sliding block (213) is slidably engaged in the middle of each of the multiple sliding chambers (2133), and the lower part of each of the multiple sliding rollers (2131) is in contact with the upper surface of the sliding block (213). The lower mold (1) has multiple compression chambers (215) on the side near the sliding cavity (2133). A piston (216) is slidably locked in the middle of each of the multiple compression chambers (215). Multiple air outlet pipes (214) are fixedly installed on the lower part of the lower mold (1). A check valve (2141) is installed in the middle of each of the multiple air outlet pipes (214). The multiple check valves (2141) are configured to allow gas to flow from the exhaust chamber (2113) to the compression chamber (215). Both ends of the multiple air outlet pipes (214) are respectively sealed and connected to the exhaust chamber (2113) and the compression chamber (215). A recovery assembly (22) is provided on one side of the piston (216) for restoring its telescopic assembly (21).

2. The rapid gas exhaust mechanism for reducing injection molding period according to claim 1, characterized in that: The recovery assembly (22) includes two springs (221) fixedly installed on one side of the piston (216). The other ends of the two springs (221) are fixedly installed on one side of the compression chamber (215). Two symmetrically distributed telescopic rods (222) are fixedly installed on one side of the middle of the multiple compression chambers (215). One side of the multiple pistons (216) is fixedly installed on one end of the telescopic rods (222). Multiple air outlet chambers (223) are opened on one side of the lower mold (1). The multiple air outlet chambers (223) are all connected to the compression chambers (215).

3. The rapid gas exhaust mechanism for reducing injection molding period according to claim 1, characterized in that: Two symmetrically distributed sliding rings (2111) are fixedly installed on the upper part of each of the multiple sliding rods (2111). Multiple evenly distributed exhaust holes (2112) are opened on the upper part of the multiple sliding rings (2111). The multiple sliding rings (2111) are slidably locked in the middle of the exhaust chamber (2113).

4. The rapid gas exhaust mechanism for reducing injection molding period according to claim 1, characterized in that: Each of the sliding blocks (213) has a slider (2132) fixedly installed at its bottom end, and each of the sliding cavities (2133) has a groove at its lower part, and each of the sliders (2132) is slidably locked inside the groove.

5. The rapid gas exhaust mechanism for reducing injection molding period according to claim 1, characterized in that: The multiple exhaust chambers (2113) are all interconnected with the sliding chamber (2133), and the lower part of the multiple exhaust chambers (2113) is an inwardly tightened structure.

6. The rapid gas exhaust mechanism for reducing injection molding period according to claim 1, characterized in that: The upper part of the lower mold (1) has multiple sets of evenly distributed air inlet grooves (2122), and the air inlet grooves (2122) are all connected to the air inlet chamber (2121).

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