Rubber forming mold

Abstract

The utility model relates to a rubber forming die which comprises an upper die and a lower die which are detachably connected, cavities are formed in the upper die and the lower die, the upper die or the lower die is provided with a first channel, the upper die is provided with a center hole, the center hole extends outwards to form a limiting groove, and the upper die is provided with a sealing plug penetrating through the center hole. An upper cover is integrally arranged at the top end of the sealing plug, the diameter of the upper cover is larger than that of the center hole, a hollow part is arranged between the upper cover and the sealing plug, and the bottom end of the sealing plug is located below the upper die; the sealing plug extends outwards to form a limiting block, the bottom end of the limiting block makes contact with the bottom face of the limiting groove, a gap is formed between the top end of the limiting block and the top face of the limiting groove, and a communicating hole is formed in the position, located above the limiting block, of the limiting groove and communicates with the cavity. A flow guide hole is formed in the position, corresponding to the communicating hole, of the sealing plug, an exhaust hole is formed in the upper cover, and the flow guide hole and the exhaust hole communicate with the hollow part. When the mold is used, molten raw materials are not prone to overflowing through the exhaust holes.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber component molding, in particular to a rubber molding mold. Background Art

[0002] In the prior art, the manufacturing process of rubber products is to assemble the molding mold, inject molten raw materials into the cavity in the mold, and demold the raw materials after they are cooled and solidified. In order to discharge the gas in the cavity, a certain gap is deliberately left between the upper mold and the lower mold during production. In this way, a large amount of burrs will be generated at the gap position of the demolded rubber product. After demolding, a lot of time and effort are required to deal with the burrs, which is troublesome and laborious. For this reason, people try to set exhaust holes on the upper mold to reduce or even eliminate the burrs. However, in actual use, if the exhaust holes are too small, the ventilation effect is poor, the speed at which the molten raw materials are injected into the cavity is slow, the production efficiency is low, and there is a risk of clogging. If the exhaust holes are too large, the molten raw materials are easy to overflow through the exhaust holes. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings in the prior art and to propose a rubber molding die to at least solve one of the above technical problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A rubber molding mold, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are detachably connected, and in a connected state, a cavity for injecting raw materials is formed inside the upper mold and the lower mold, a first channel communicating with the cavity is provided on the upper mold or the lower mold, a center hole communicating with the cavity is provided on the upper mold, the center hole extends outward from the interior of the upper mold to form a limiting groove, a sealing plug is provided on the upper mold through the center hole, the sealing plug is slidably connected to the center hole, an upper cover is integrally provided on the top of the sealing plug, and the diameter of the upper cover is larger than the center hole The diameter of the sealing plug is a hollow part between the upper cover and the sealing plug, and the bottom end of the sealing plug is located below the upper mold; the sealing plug extends outwardly to form a limiting block corresponding to the position of the limiting groove, the bottom end of the limiting block contacts the bottom surface of the limiting groove, and there is a distance between the top end and the top surface of the limiting groove, and the limiting groove is provided with a connecting hole at the position above the limiting block, and the connecting hole is connected with the chamber; the sealing plug is provided with a guide hole at the position corresponding to the connecting hole, and the upper cover is provided with an exhaust hole, and the guide hole and the exhaust hole are both connected with the hollow part.

[0006] Preferably, a bracket is fixed to the top surface of the upper mold, a baffle is fixed to the top surface of the bracket, and the upper cover is located on the inner side of the bracket; the distance from the upper cover to the baffle is equal to the distance from the bottom end of the sealing plug to the bottom end of the upper mold; the distance from the bottom end of the sealing plug to the bottom end of the upper mold is equal to the distance between the limit block and the top surface of the limit groove.

[0007] Preferably, the outer diameter of the sealing plug is equal to the diameter of the central hole; the outer diameter of the limiting block is equal to the inner diameter of the limiting groove.

[0008] Preferably, a refrigerant inlet and a refrigerant outlet are provided on the upper mold, and the refrigerant inlet and the refrigerant outlet are connected through a refrigerant channel; an annular channel is provided in the refrigerant channel, and some connecting holes are located on the inner side of the annular channel.

[0009] Preferably, the upper die and the lower die are connected by bolts.

[0010] When the rubber molding mold of the utility model is in use, after the upper mold and the lower mold are connected, molten raw materials are injected into the cavity in the mold through the first channel. In the original state, the sealing plug makes the limit block located at the bottom of the limit groove under the action of gravity. During the injection of the raw materials, the gas in the chamber can be discharged through the connecting hole-the guide hole-the hollow part-the exhaust hole in sequence. As the raw materials accumulate, the top surface of the raw materials in the chamber rises, and after contacting the sealing plug, buoyancy is generated on the sealing plug, so that the sealing plug gradually moves upward, and gradually cuts off the connecting hole and the guide hole, so that when the exhaust hole is too large, the molten raw materials are not easy to overflow through the exhaust hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a top view of a rubber molding mold proposed by the utility model;

[0012] Figure 2 This is one of the cross-sectional views of a rubber molding die proposed in the utility model;

[0013] Figure 3 This is the second cross-sectional view of a rubber molding die proposed by the utility model;

[0014] In the figure: upper mold 100, limiting groove 101, connecting hole 102, lower mold 200, first channel 201, chamber 300, sealing plug 400, upper cover 401, hollow part 402, limiting block 403, guide hole 404, exhaust hole 405, bracket 500, baffle 501, refrigerant inlet 601, refrigerant outlet 602, refrigerant channel 603, annular channel 604, bolt 700. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] Example, see Figure 1-Figure 3 The present embodiment is a rubber molding mold, comprising an upper mold 100 and a lower mold 200, the upper mold and the lower mold are connected by bolts 700, in the connected state, the upper mold and the lower mold form a chamber 300 for injecting raw materials, the lower mold is provided with a first channel 201 connected to the chamber, the upper mold is provided with a center hole connected to the chamber, the center hole extends outward from the interior of the upper mold to form a limiting groove 101, the upper mold is provided with a sealing plug 400 penetrating the center hole, the sealing plug is slidably connected to the center hole, the diameter of the sealing plug can be set to be the same as or slightly smaller than the diameter of the center hole during manufacturing, and the top of the sealing plug is integrally provided There is an upper cover 401, the diameter of which is larger than the diameter of the center hole, a hollow portion 402 is provided between the upper cover and the sealing plug, and the bottom end of the sealing plug is located below the upper mold; the sealing plug extends outwardly at a position corresponding to the limiting groove to form a limiting block 403, the bottom end of the limiting block contacts the bottom surface of the limiting groove, and there is a gap between the top end and the top surface of the limiting groove, and a connecting hole 102 is provided at a position of the limiting groove above the limiting block, and the connecting hole is connected to the chamber; a guide hole 404 is provided at a position of the sealing plug corresponding to the connecting hole, and an exhaust hole 405 is provided on the upper cover, and both the guide hole and the exhaust hole are connected to the hollow portion.

[0017] It should be noted that, in the above embodiment, the upper mold and the lower mold may not be connected by bolts, and other detachable connection methods may also be used to achieve the purpose of the utility model; in the above embodiment, the first channel may also be provided on the upper mold.

[0018] When the above-mentioned rubber molding mold is in use, after the upper mold and the lower mold are connected, molten raw material is injected into the cavity in the mold through the first channel. In the original state, the sealing plug is located at the bottom of the limiting groove under the action of gravity. During the injection of the raw material, the gas in the chamber can be discharged through the connecting hole-the guide hole-the hollow part-the exhaust hole in sequence. As the raw material accumulates, the top surface of the raw material in the chamber rises, and after contacting the sealing plug, buoyancy is generated on the sealing plug, so that the sealing plug gradually moves upward, and gradually cuts off the connecting hole and the guide hole, so that when the exhaust hole is too large, the molten raw material is not easy to overflow through the exhaust hole.

[0019] In one embodiment, a bracket 500 is fixed to the top surface of the upper mold, a baffle 501 is fixed to the top surface of the bracket, and the upper cover is located on the inner side of the bracket; the distance from the upper cover to the baffle is equal to the distance from the bottom end of the sealing plug to the bottom end of the upper mold; the distance from the bottom end of the sealing plug to the bottom end of the upper mold is equal to the distance between the limit block and the top surface of the limit groove. In this structure, when the sealing plug is gradually moved up to the highest position, the upper cover just contacts the baffle, and the exhaust hole is pressed against the top to further prevent the molten raw material from overflowing through the exhaust hole. During manufacturing, the outer diameter of the sealing plug can be made equal to the diameter of the center hole; the outer diameter of the limit block is equal to the inner diameter of the limit groove.

[0020] In one embodiment, the upper mold is provided with a refrigerant inlet 601 and a refrigerant outlet 602, and the refrigerant inlet and the refrigerant outlet are connected through a refrigerant channel 603; an annular channel 604 is provided in the refrigerant channel, and part of the connecting holes are located on the inner side of the annular channel. In this structure, during the injection process of the raw material, the refrigerant is injected into the upper mold through the refrigerant inlet. Once the molten raw material enters the connecting hole and flows outward, the refrigerant exchanges heat with the raw material at the annular channel, so that the raw material cools and solidifies, forming a blockage on the connecting hole, increasing the pressure of the raw material flow on the sealing plug, accelerating the upward movement of the blockage, making it easier for the sealing plug to cut off the connecting hole and the guide hole, so that when the exhaust hole is too large, the molten raw material is less likely to overflow through the exhaust hole.

[0021] The above description is only a preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present utility model can make equivalent substitutions or changes based on the technical scheme and utility model concept of the present utility model, which should be covered by the protection scope of the present utility model.

Claims

1. A rubber molding mold, comprising an upper mold (100) and a lower mold (200), wherein the upper mold and the lower mold are detachably connected, and in a connected state, a cavity (300) for injecting a raw material is formed inside the upper mold and the lower mold, and a first channel (201) communicating with the cavity is provided on the upper mold or the lower mold, characterized in that: The upper mold is provided with a center hole communicating with the chamber, the center hole extending outward from the interior of the upper mold to form a limiting groove (101), the upper mold is provided with a sealing plug (400) penetrating the center hole, the sealing plug is slidably connected to the center hole, the top of the sealing plug is integrally provided with an upper cover (401), the diameter of the upper cover is larger than the diameter of the center hole, a hollow portion (402) is provided between the upper cover and the sealing plug, and the bottom end of the sealing plug is located below the upper mold; The sealing plug extends outwardly at a position corresponding to the limiting groove to form a limiting block (403), the bottom end of the limiting block contacts the bottom surface of the limiting groove, and there is a gap between the top end and the top surface of the limiting groove, and the limiting groove is provided with a connecting hole (102) at a position above the limiting block, and the connecting hole is connected to the chamber; The sealing plug is provided with a guide hole (404) at a position corresponding to the communicating hole, and the upper cover is provided with an exhaust hole (405), and both the guide hole and the exhaust hole are communicated with the hollow portion.

2. A rubber molding die according to claim 1, characterized in that: A bracket (500) is fixed on the top surface of the upper mold, a baffle (501) is fixed on the top surface of the bracket, and the upper cover is located on the inner side of the bracket; The distance from the upper cover to the baffle is equal to the distance from the bottom end of the sealing plug to the bottom end of the upper mold; The distance from the bottom end of the sealing plug to the bottom end of the upper mold is equal to the distance from the limiting block to the top surface of the limiting groove.

3. A rubber molding die according to claim 2, characterized in that: The outer diameter of the sealing plug is equal to the diameter of the central hole; The outer diameter of the limiting block is equal to the inner diameter of the limiting groove.

4. A rubber molding die according to any one of claims 1 to 3, characterized in that: The upper mold is provided with a refrigerant inlet (601) and a refrigerant outlet (602), and the refrigerant inlet and the refrigerant outlet are connected via a refrigerant channel (603); An annular channel (604) is provided in the refrigerant channel, and some of the connecting holes are located on the inner side of the annular channel.

5. The rubber molding die according to claim 1, characterized in that: The upper die and the lower die are connected via bolts (700).

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