Plastic mold convenient to discharge

Abstract

The utility model discloses a plastic mould convenient for blanking, which belongs to the technical field of moulds, and comprises a mould body, the mould body comprises a lower mould and an upper mould, a mould cavity is formed when the lower mould and the upper mould are closed, the mould cavity is provided with an excess material groove, the mould body is provided with a material injection port, and the mould body is provided with a plurality of air inlet channels and exhaust channels. One end of the air inlet channel is connected with an air pump which is used for introducing air into the air inlet channel when the material is injected into the mold cavity, the time for introducing the air into the mold cavity is longer than or equal to the time for injecting the material into the mold cavity, the other end of the air inlet channel is arranged towards the side wall of the excess material groove, and the exhaust channel is communicated with the outside of the mold body. According to the plastic mold convenient to discharge, gas is injected into the mold cavity during material injection, so that the amount of materials adhered to the side wall of the excess material groove is effectively reduced, meanwhile, the materials formed in the excess material groove are smoother, the subsequent step of polishing the position is simplified, and the post-processing step of a product is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a plastic mold which is convenient for blanking. Background Art

[0002] A plastic mold is a mold used for injection molding plastic products. Existing cylindrical products such as plastic barrels are mostly made by combining an upper mold and a lower mold. In order to easily remove the product from the lower mold that fits the inner wall of the product, the side of the cylindrical structure is usually designed to be a truncated cone with a small bottom and a large top.

[0003] The existing cylindrical mold is usually injected from the bottom of the product during injection molding, and a residual material groove is left at the same position so that the excess material can be concentrated on the outer bottom surface of the cylindrical product during molding to keep the inner surface of the cylindrical product smooth.

[0004] However, when the material is injected into the mold, it will abut against the side wall of the residual material groove due to the flow direction of the liquid, resulting in a circle of relatively abrupt residual material on the finished product. This layer of residual material is easy to stick to the upper mold, so that the product has a chance to adhere to the upper mold, affecting the manual unloading speed during large-scale production. In addition, consumers are likely to feel obvious angularity when touching this position of the product, so manufacturers also need to properly grind the residual material after unloading.

[0005] In view of the above problems, a plastic mold technical solution that is easy to cut is proposed. Utility Model Content

[0006] The utility model aims to solve the problems in the prior art and provides a plastic mould which is convenient for material cutting.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a plastic mold that is easy to unload, including a mold body, the mold body including a lower mold and an upper mold that are slidably fitted, a mold cavity is formed when the lower mold and the upper mold are closed, the mold cavity is provided with a residual material groove, the mold body is provided with an injection port connected to the residual material groove, the mold body is provided with a plurality of air inlet channels and exhaust channels connected to the residual material groove, one end of the air inlet channel is connected to an air pump that introduces gas into the air inlet channel when injecting material into the mold cavity through the injection port, and the time for injecting gas into the mold cavity is greater than or equal to the time for injecting material into the mold cavity, the other end of the air inlet channel is arranged toward the side wall of the residual material groove, and the exhaust channel is connected to the outside of the mold body.

[0008] The utility model is further configured as follows: a plurality of the air inlet channels and the air exhaust channels include air injection holes opened on the mold body, the plurality of the air injection holes are arranged surrounding the injection port, adjacent air injection holes are arranged at the same distance, and the air inlet channels and the air exhaust channels are arranged in an alternating manner.

[0009] The utility model is further configured as follows: an air guide block is fixedly arranged in the air injection hole of the mold body, an air guide port is left between the air guide block and the inner wall of the air injection hole, and the air guide block is used to guide the gas in the air injection hole to flow toward the groove wall of the residual material groove through the air guide port.

[0010] The utility model is further configured as follows: the inner wall of the air injection hole near the air guide port is in an arc shape.

[0011] The utility model is further configured as follows: the end surface of the air injection hole close to the residual material groove is arranged flush with the groove bottom of the residual material groove.

[0012] The utility model is further configured as follows: a plurality of the gas injection holes are connected with the air pump through a conduit, and the gas guide block blocks the gas that enters the gas injection holes along the conduit from directly entering the residual material tank.

[0013] In summary, the utility model has the following beneficial effects: by injecting gas into the mold cavity during injection, the amount of material adhering to the side wall of the residual material groove is effectively reduced. At the same time, the material formed in the residual material groove is made smoother, which simplifies the subsequent steps of polishing the position and optimizes the steps of product post-processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0017] Figure 4 It is a structural schematic diagram of the upper mold of the utility model.

[0018] In the figure: 1, lower mold; 2, upper mold; 21, air injection hole; 211, air guide port; 3, injection sleeve; 31, injection port; 4, residual material groove; 5, air guide block; 6, catheter. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments.

[0020] Plastic molds that are easy to cut, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the mold body includes a lower mold 1 and an upper mold 2 that are slidably fitted. A mold cavity is formed when the lower mold 1 and the upper mold 2 are molded together. Taking the production of plastic flower pots as an example, the lower mold 1 fits the inner surface of the flower pot when molding the flower pot, and the upper mold 2 fits the outer surface of the flower pot when molding the flower pot. A residual material groove 4 is provided on one side of the mold cavity close to the upper mold 2. An injection sleeve 3 is fixedly connected to the upper mold 2. The injection sleeve 3 is provided with an injection port 31 connected to the residual material groove 4. In this specific embodiment, the axis of the injection port 31 is aligned with the axis of the plastic flower pot;

[0021] The upper mold 2 is provided with a plurality of air inlet channels and exhaust channels connected to the residual material groove 4. One end of the air inlet channel is connected to an air pump for introducing gas into the air inlet channel when injecting material into the mold cavity through the injection port 31, and the time for introducing gas into the mold cavity is greater than or equal to the time for injecting material into the mold cavity. The other end of the air inlet channel is arranged toward the side wall of the residual material groove 4, and the exhaust channel is connected to the outside of the mold body. The residual material groove 4 is ventilated by the air pump, so that the material originally attached to the side wall of the residual material groove 4 due to the flow of liquid material during injection can be evenly spread in the residual material groove 4 due to the continuous blowing of gas before molding.

[0022] Practical effect: By injecting gas into the mold cavity during injection, the amount of material adhering to the side wall of the residual material groove 4 is effectively reduced. At the same time, the material formed in the residual material groove 4 is made smoother, which simplifies the subsequent steps of grinding the position and optimizes the steps of product post-processing.

[0023] like Figure 2 , Figure 3 as well as Figure 4As shown, a plurality of air inlet channels and exhaust channels include air injection holes 21 opened on the mold body, and a plurality of air injection holes 21 are arranged around the injection port 31, and adjacent air injection holes 21 are arranged at the same distance, and the air inlet channels and exhaust channels are arranged alternately. The mold body is fixedly provided with an air guide block 5 in the air injection hole 21, and an air guide port 211 is reserved between the air guide block 5 and the inner wall of the air injection hole 21. The air guide block 5 is used to guide the gas in the air injection hole 21 to flow toward the groove wall of the residual material groove 4 through the air guide port 211. The end surface of the air injection hole 21 close to the residual material groove 4 is arranged flush with the groove bottom of the residual material groove 4. The air guide block 5 is made of steel and is fixedly connected to the upper mold 2 by welding.

[0024] Furthermore, in order to disperse the amount of gas flowing to the wall of the residual material trough 4 more evenly, the inner wall of the gas injection hole 21 near the gas guide port 211 is in an arc shape. In order to prevent the high-speed gas from being injected into the gas injection hole 21 and directly blowing into the mold cavity when the air pump is started and shut down, several gas injection holes 21 are connected to the air pump through the conduit 6, and the gas guide block 5 blocks the gas that enters the gas injection hole 21 along the conduit 6 from directly entering the residual material trough 4.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A plastic mold for easy material discharge, comprising a mold body, wherein the mold body comprises a lower mold and an upper mold that are slidably fitted, a mold cavity is formed when the lower mold and the upper mold are closed, the mold cavity is provided with a residual material groove, and the mold body is provided with a material injection port connected to the residual material groove, characterized in that: The mold body is provided with a plurality of air inlet channels and exhaust channels connected to the residual material groove. One end of the air inlet channel is connected to an air pump for introducing gas into the air inlet channel when injecting material into the mold cavity through the injection port, and the time for injecting gas into the mold cavity is greater than or equal to the time for injecting material into the mold cavity. The other end of the air inlet channel is arranged toward the side wall of the residual material groove, and the exhaust channel is connected to the outside of the mold body.

2. The plastic mold for easy blanking according to claim 1, characterized in that: The air inlet channels and the exhaust channels include air injection holes opened on the mold body. The air injection holes are arranged around the injection port. Adjacent air injection holes are arranged at the same distance. The air inlet channels and the exhaust channels are arranged alternately.

3. The plastic mold for easy blanking according to claim 2, characterized in that: The mold body is fixedly provided with an air guide block in the air injection hole, and an air guide port is reserved between the air guide block and the inner wall of the air injection hole. The air guide block is used to guide the gas in the air injection hole to flow toward the groove wall of the residual material groove through the air guide port.

4. The plastic mold for easy blanking according to claim 3, characterized in that: The inner wall of the air injection hole near the air guide port is in an arc shape.

5. The plastic mold for easy blanking according to claim 3, characterized in that: The air injection hole is arranged flush with the bottom of the residual material trough at an end surface close to the residual material trough.

6. The plastic mold for easy blanking according to claim 3, characterized in that: A plurality of the gas injection holes are connected to the air pump through a conduit, and the gas guide block blocks the gas that enters the gas injection holes along the conduit from directly entering the residual material tank.

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