Return pressure relief valve of wet pressing die

Abstract

The utility model discloses a return material pressure release valve of a wet pressing mold, and particularly relates to the field of injection mold structures. The pressure relief structure comprises a valve core, a pressure relief channel and a pressure relief hole, the pressure relief channel is communicated with the inside and the outside of the fixed mold through an opening, the valve core is arranged in the pressure relief channel in a penetrating manner, and the end surface, positioned in the pressure relief channel, of the valve core comprises a step surface I and a step surface II; pressure relief holes are formed in the side wall of the valve element and the second step face adjacent to the first step face. A telescopic rod of the telescopic cylinder is connected with the valve element so as to drive the valve element to move in the pressure relief channel, by designing the pressure relief channel penetrating through the interior and the exterior of the fixed mold and the hollow valve element capable of sliding in the pressure relief channel, when the telescopic cylinder pulls out of the valve element, the high-pressure environment in the mold cavity can be discharged outwards from the pressure relief channel and the valve element, the purpose of pressure relief is achieved, and after pressure relief is completed, the valve element can slide in the pressure relief channel. And the material spraying condition is avoided when the mold is opened.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold structure field more specifically, the utility model relates to a kind of wet pressure mould back material pressure relief valve. BACKGROUND

[0002] Injection mold includes fixed mould and movable mould, the inside of two closed type has the cavity for forming, cavity is connected by injection channel and injection system.

[0003] The injection material channel pressure of existing injection mold cannot be completely relieved by suction valve when using, so when movable mould opens, the workpiece in cavity can exist to the outside injection material situation, leading to mould surface dirty, ground dirty, affect product appearance. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of the utility model provide a kind of wet pressure mould back material pressure relief valve, the technical problems to be solved by the utility model are: how to improve the pressure relief capacity in the cavity of injection mold.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of wet pressure mould back material pressure relief valve, including forming parts, including fixed mould;Pressure relief structure, including valve core, pressure relief channel and pressure relief hole, pressure relief channel is communicated inside and outside fixed mould by opening, valve core is arranged in pressure relief channel, the end face of valve core in pressure relief channel includes stepped surface one and stepped surface two, stepped surface one is embedded in the opening of pressure relief channel and the surface of cavity is coplanar and is closed face, pressure relief hole is formed on the side wall of valve core and the stepped surface two adjacent to stepped surface one;The telescopic rod of telescopic cylinder is connected with valve core to drive valve core to move in pressure relief channel.

[0006] In a preferred embodiment, a spring type check valve is installed in the pressure relief hole.

[0007] In a preferred embodiment, the valve core and the connecting plate are detachably connected by a buckle structure, and the connecting plate and the outer end face of the fixed mould are connected by a threaded fastener.

[0008] In a preferred embodiment, the pressure relief channel includes a pipeline body and a shielding surface, the pipeline body communicates inside and outside the fixed mould, the shielding surface is fixed to one side of the end face of the pipeline body, the other side of the same end face of the pipeline body is an opening, the stepped surface one of the valve core is embedded in the opening, and the stepped surface two can be attached to the inner wall of the shielding surface.

[0009] In a preferred embodiment, the cross-sectional shape of the pipeline body is a groove shape with arc-shaped ends and symmetry, and the opening shape is circular.

[0010] In a preferred embodiment, the pipeline body penetrates the fixed mould.

[0011] In a preferred embodiment, the pipe body is detachably connected to a mounting hole formed in the fixed mold.

[0012] In a preferred embodiment, the telescopic cylinder comprises a cylinder base and a telescopic rod, the cylinder base is fixed to the outer end face of the fixed mold, one end of the telescopic rod is slidably connected in the cylinder base and the other end is connected to the valve core, a control unit for controlling the movement of the telescopic rod is arranged in the cylinder base, and the control unit is electrically connected to an external controller.

[0013] The technical effects and advantages of the present application are as follows:

[0014] By designing the pressure relief channel penetrating the fixed mold, and the hollow valve core which can slide in the pressure relief channel, when the telescopic cylinder pulls out the valve core, the high pressure environment inside the cavity can be discharged outward from the pressure relief channel and the valve core, achieving the purpose of pressure relief. Because the opening diameter of the pressure relief channel and the pressure relief hole can be designed in advance, there is no need to worry about material spraying during pressure relief. Driving the valve core to release the pressure in the mold before mold opening can effectively solve the problem of material return. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the present application. The embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0016] Figure 1 The structure diagram of the wet compression mold material return pressure relief valve of the present application.

[0017] Figure 2 The installation position schematic diagram of the valve core in the present application

[0018] Figure 3 The assembly schematic diagram of the connecting plate and the valve core in the present application.

[0019] Figure 4 The schematic diagram of the pressure relief channel opening in the present application.

[0020] Figure 5 The structure diagram of the pressure relief structure in the present application.

[0021] Figure 6 The layout position schematic diagram of the spring type one-way valve in the present application.

[0022] Figure 7 The structure diagram of the split type pressure relief channel in the present application.

[0023] Figure 8 The design diagram of the cross section of the slot type pressure relief channel in the present application.

[0024] The reference signs are: 1, fixed mold; 2, pressure relief structure; 21, valve core; 22, connecting plate; 23, pressure relief channel; 231, pipeline body; 232, shielding surface; 24, pressure relief hole; 25, spring type one-way valve; 3, telescopic cylinder. DETAILED DESCRIPTION

[0025] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art. The accompanying drawings are included to provide a further understanding of example implementations and are incorporated in and constitute a part of this disclosure. The drawings are not intended to be restrictive in any way.

[0026] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more example implementations. In the following description, numerous specific details are provided to give a thorough understanding of example implementations. One skilled in the relevant art will recognize, however, that the techniques described can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of the disclosure.

[0027] EMBODIMENT

[0028] As Figure 1 - Figure 8 A wet compression mold material return pressure relief valve, including a molding part, a pouring system, a guide mechanism, an ejection device, a side parting and core pulling mechanism, a cooling and heating system, an exhaust system, a mold base, a mold core and a mold cavity, a mold electrical control system and other parts, and the use relationship between the parts has matured, so no more.

[0029] The molding part includes a fixed mold 1, which generally has an injection channel. In this embodiment, a pressure relief structure 2 is provided on one side of the injection channel.

[0030] The pressure relief structure 2 comprises a valve core 21, a connecting plate 22, a pressure relief channel 23 and pressure relief holes 24. The valve core 21 is a hollow rod body, and a plurality of pressure relief holes 24 are formed on the valve core 21 to communicate the inside and outside of the valve core 21. The connecting plate 22 is detachably connected with the valve core 21 through a buckle structure. The buckle structure is commonly designed and thus will not be described herein. Alternatively, the connecting plate 22 can be directly fixedly connected with the valve core 21. The connecting plate 22 is detachably connected with the fixed mold 1 through screwing. Therefore, the connecting plate 22 can fix the valve core 21 to the fixed mold 1 and remove the valve core 21 from the fixed mold 1 when needed. The fixed mold 1 is provided with the pressure relief channel 23 for allowing the valve core 21 to pass through. The pressure relief channel 23 comprises a pipeline body 231 and a shielding surface 232. The pipeline body 231 is a passage penetrating through the fixed mold 1. The shielding surface 232 is a shielding surface with an area smaller than that of the end surface of the valve core 21. Therefore, on the end surface of the valve core 21, in addition to the shielding part of the shielding surface 232, a part is exposed, which is referred to as an opening. The end of the valve core 21 extending into the pressure relief channel 23 is outwardly convex. For the purpose of description, the outwardly convex surface of the valve core 21 is referred to as a stepped surface I, and the surface adjacent to the stepped surface I is referred to as a stepped surface II. The stepped surface I is embeddedly matched with the opening. The stepped surface II is also provided with the pressure relief holes 24. When the valve core 21 is pulled out from the state of being completely inserted into the pressure relief channel 23, the gas flow can flow outwards through the pressure relief channel 23 and the pressure relief holes 24, thereby achieving the purpose of outward pressure relief.

[0031] It is necessary that the stepped surface I of the valve core 21, the outer wall of the shielding surface 232 and the inner surface of the cavity of the fixed mold 1 are coplanar, so as not to affect the shaping of the workpiece.

[0032] Preferably, a spring type check valve 25 is installed in the pressure relief hole 24. The spring type check valve 25 is a check valve using spring force to control the opening and closing of the valve port. The working principle is that when the fluid flows from the inlet, the fluid pressure overcomes the spring force and the friction force, and pushes the valve flap to open, allowing the fluid to pass through the valve port. When the fluid flows in the opposite direction or there is no fluid flow, the spring force closes the valve port to prevent backflow of the fluid.

[0033] Preferably, the pressure relief channel 23 is designed in a split type, which can optimize the machining process. Specifically, the pressure relief channel 23 comprises the pipeline body 231 and the shielding surface 232. The pipeline body 231 is fitted into the mounting hole previously formed in the fixed mold 1 in a transition fit manner, and the shielding surface 232 is designed in an integrated manner with the pipeline body 231. This way only needs to first form a slot-shaped through hole on the fixed mold 1, and then insert the pipeline body 231, and the pipeline body 231 and the shielding surface 232 can be machined on the machine tool in advance due to their small size.

[0034] Preferably, the pipe body 231 is shaped as an arc-shaped groove with equal thickness at both ends, which is convenient to process, the pipe body 231 is not punched at first, the remaining thickness is the thickness of the shielding surface 232, at this time, the hole is punched at the adjacent position of the shielding surface 232, the punched hole is the opening, and the remaining surface is the shielding surface 232, and such a processing mode is simpler.

[0035] The telescopic cylinder 3 comprises a cylinder base and a telescopic rod, the cylinder base is fixed to the outer end face of the fixed mold 1, one end of the telescopic rod is slidably connected in the cylinder base, and the other end is connected with the valve core 21, a control unit for controlling the movement of the telescopic rod is arranged in the cylinder base, and the control unit is electrically connected with an external controller, and since the existing telescopic cylinder 3 is prior art, details are omitted.

[0036] In the embodiment, the telescopic cylinder 3 is preferably a pneumatic cylinder, an oil cylinder or an electric cylinder.

[0037] Principle of the utility model:

[0038] By designing the pressure relief channel 23 penetrating the fixed mold 1 and the hollow valve core 21 which can slide in the pressure relief channel 23, when the telescopic cylinder 3 pulls out the valve core 21, the high-pressure environment in the cavity can be discharged outward from the pressure relief channel 23 and the valve core 21, achieving the purpose of pressure relief, since the opening diameter of the pressure relief channel 23 and the pressure relief hole 24 can be designed in advance, there is no need to worry about the material spraying during pressure relief, and after the pressure relief is completed, the material spraying will not occur when the mold is opened.

[0039] The above only describes some exemplary embodiments of the utility model in a descriptive manner, without doubt, for ordinary skilled persons in the art, the described embodiments can be modified in various ways without deviating from the spirit and scope of the utility model. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the utility model claims.

[0040] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0041] Secondly: the utility model discloses the embodiment of the drawings, only relates to the structure involved in the embodiment of the utility model, other structures can refer to the general design, in the case of no conflict, the same embodiment and different embodiments of the utility model can be combined with each other;

[0042] Finally: the above described is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and any modification, equivalent replacement, improvement and the like made in the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A wet press mold return material relief valve characterized by The utility model relates to a kind of pressure relief structure and the moulding part of stretchable cylinder, including: Moulding part, including fixed mould (1); Pressure relief structure (2), including valve core (21), pressure relief channel (23) and pressure relief hole (24), pressure relief channel (23) is communicated inside and outside fixed mould (1) by opening, valve core (21) is arranged in pressure relief channel (23), and the end face of valve core (21) in pressure relief channel (23) includes step surface one and step surface two, step surface one is embedded in the opening of pressure relief channel (23) and the surface of cavity is flush, and step surface two adjacent to step surface one in the side wall of valve core (21) are all provided with pressure relief hole (24); The telescopic rod of telescopic cylinder (3) is connected with valve core (21) to drive valve core (21) to move in pressure relief channel (23).

2. A wet press mould return line pressure relief valve according to claim 1, characterised in that: Spring type check valve (25) is installed in the pressure relief hole (24).

3. A wet press mold return line pressure relief valve according to claim 1, wherein: Valve core (21) and connecting plate (22) are detachably connected by buckle structure, and connecting plate (22) and the outer end face of fixed mould (1) are connected by threaded fastener.

4. A wet press mold return line pressure relief valve as defined in claim 1, wherein: Pressure relief channel (23) includes pipeline body (231) and shielding surface (232), pipeline body (231) is communicated inside and outside fixed mould (1), shielding surface (232) is fixed to one side of the end face of pipeline body (231), and the other side of the same end face of pipeline body (231) is opening, and step surface one of valve core (21) is embedded in opening, and step surface two can be attached to the inner wall of shielding surface (232).

5. A wet press mould return line pressure relief valve according to claim 4, characterised in that: The cross-sectional shape of the pipeline body (231) is groove-shaped with arc-shaped ends and symmetrically, and the opening shape is circular.

6. A wet press mould return line pressure relief valve according to claim 4 or 5, characterised in that: The pipeline body (231) is provided through fixed mould (1).

7. A wet press mould return line pressure relief valve according to claim 4 or 5, characterised in that: The pipeline body (231) is detachably connected in the mounting hole provided in fixed mould (1), and the mounting hole penetrates fixed mould (1).

8. A wet press mold return line pressure relief valve as defined in claim 1, wherein: Telescopic cylinder (3) includes cylinder seat and telescopic rod, cylinder seat is fixed on the outer end face of fixed mould (1), one end of telescopic rod is slidably connected in cylinder seat and the other end is connected with valve core (21), control unit for controlling the movement of telescopic rod is arranged in cylinder seat, and control unit and external controller are electrically connected.

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