CN221033979U

CN221033979U - Mechanical vacuum self-priming valve of die casting die

Info

Publication number: CN221033979U
Application number: CN202322816735.9U
Authority: CN
Inventors: 施策
Original assignee: Ningbo Tuogang Mold Parts Manufacturing Co ltd
Current assignee: Ningbo Tuogang Mold Parts Manufacturing Co ltd
Priority date: 2023-10-20
Filing date: 2023-10-20
Publication date: 2024-05-28
Anticipated expiration: 2033-10-20

Abstract

The utility model discloses a mechanical vacuum self-priming valve of a die casting die, which comprises a fixed die valve body and a movable die valve body positioned at the lower side of the fixed die valve body, wherein a core pulling block is arranged at one side between the fixed die valve body and the movable die valve body, a cylinder body is arranged at one side of the core pulling block, a driving piston is arranged in the cylinder body, a valve core with one end connected with the driving piston is arranged in the core pulling block, the other end of the valve core stretches into the space between the fixed die valve body and the movable die valve body, a vacuumizing channel communicated with the outside is formed between the valve core and the core pulling block, an active air pressure cavity and a back air pressure cavity are arranged in the cylinder body, the back air pressure cavity and the active air pressure cavity are both connected with an external air channel, and the area of a first end face of one side of the driving piston, which faces a sealing ring, is larger than the area of a second end face of the driving piston. The utility model can solve the technical problems that only the passively closed vacuumizing valve and the valve core is easy to be pulled back to be closed during vacuumizing in the prior art.

Description

Mechanical vacuum self-priming valve of die casting die

Technical Field

The utility model relates to the technical field of die casting die structures, in particular to a mechanical vacuum self-priming valve of a die casting die.

Background

The die casting die is a die commonly used in the current metal material forming, in order to avoid the generation of air holes and defects after metal forming, an evacuating valve is generally needed to be used for evacuating air in the die, however, the existing evacuating valve has a problem in the using process that the existing valve core is damped by a spring and steel balls, the valve opening state is kept, but the steel balls are easy to wear in the using process, and in addition, the requirement on an operator is higher in the valve core adjusting process, in addition, the valve core is closed passively depending on the impact of metal liquid, if the impact of the metal liquid is reduced, the valve core can be opened automatically, and the metal liquid enters into an evacuating part to cause blockage. In the vacuumizing process, the valve core needs to be kept in an open state, low-pressure air flow is generated during vacuumizing, and the opened valve core is easily pulled back to be closed, so that the vacuumizing efficiency and the vacuumizing completion degree are seriously affected.

Disclosure of utility model

The utility model provides a mechanical vacuum self-priming valve of a die casting die, which can solve the technical problems that only a passively closed vacuumizing valve and a valve core is easy to pull back to be closed during vacuumizing in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a die casting die's mechanical vacuum self priming valve, includes cover half valve body and the movable mould valve body that is located the cover half valve body downside, cover half valve body and movable mould valve body between one side install the piece of loosing core, one side of loosing core install the cylinder body, the internally mounted of cylinder body have the initiative piston, the internally mounted of loosing core the piece have one end and initiative piston continuous case, the other end of case stretch into between cover half valve body and the movable mould valve body, case and loose core between the piece form the evacuation passageway with outside intercommunication, the inside of cylinder body be provided with the initiative atmospheric pressure chamber that is located initiative piston rear end and the back atmospheric pressure chamber that is located the initiative piston outside, the one end that is close to the case in back atmospheric pressure intracavity side be provided with the sealing washer, back atmospheric pressure chamber and initiative atmospheric pressure chamber all be connected with external air flue, the area of the first terminal surface of one side of orientation sealing washer of initiative piston be greater than the area of the second terminal surface of the rear end of initiative piston.

Preferably, the first end of the cylinder body is connected with the core pulling block, and the second end of the cylinder body stretches into and is arranged in a coupling block.

Preferably, a detachable cushion block is clamped between the second end of the cylinder body and the coupling block.

Preferably, a selection plunger connected with the cushion block is arranged on the side wall of the coupling block.

Preferably, the top of the core pulling block is provided with a vacuumizing interface communicated with the vacuumizing channel.

Preferably, a guide sleeve is arranged in the cylinder body, the valve core penetrates through the guide sleeve, and the sealing ring is arranged on the end face of the guide sleeve.

Preferably, the guide sleeve is arranged at a position between the cylinder body and the core pulling block.

Compared with the prior art, the utility model has the beneficial effects that:

The valve core vacuum pumping device is simple in structure, and is provided with the active air pressure cavity and the pull-back air pressure cavity, wherein air inlet of the active air pressure cavity can enable the valve core to be in an ejection state when the valve core is opened for vacuum pumping, and pressure maintaining gas in the pull-back air pressure cavity can enable the valve core to be in an ejection state, so that the valve core cannot be pulled back to be closed by low-pressure air flow generated by vacuum pumping, and the vacuum pumping efficiency is guaranteed. Meanwhile, when the metal liquid impacts the valve core, the valve core can be quickly pulled back and kept in a closed state by air inlet in the pull-back air pressure cavity, so that the active opening and closing control of the valve body is realized, the dependence of a vacuumizing structure on the impact force of the metal liquid is avoided, the operation is simple and convenient, the requirement on an operator is reduced, no wearing parts are arranged, and the durability is better.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a front cross-sectional view of the structure of the present utility model;

fig. 3 is an enlarged structural view at a of fig. 2.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

As shown in fig. 1-3, in order to solve the technical problems that only a passively closed vacuumizing valve is provided and a valve core is easily pulled back to be closed during vacuumizing in the prior art, the utility model provides an embodiment:

The embodiment comprises a mechanical vacuum self-priming valve of a die casting die, the mechanical vacuum self-priming valve comprises a fixed die valve body 1 and a movable die valve body 3 positioned at the lower side of the fixed die valve body 1, a core pulling block 4 is arranged at one side between the fixed die valve body 1 and the movable die valve body 3, a cylinder body 8 is arranged at one side of the core pulling block 4, a driving piston 10 is arranged in the cylinder body 8, a valve core 5 with one end connected with the driving piston 10 is arranged in the core pulling block 4, the other end of the valve core 5 stretches into the space between the fixed die valve body 1 and the movable die valve body 3, a vacuumizing channel 12 communicated with the outside is formed between the valve core 5 and the core pulling block 4, a driving air pressure cavity 13 positioned at the rear end of the driving piston 10 and a back air pressure cavity 14 positioned at the outer side of the driving piston 10 are arranged in the cylinder body 8, a sealing ring 11 is arranged at one end, which is close to the inner side of the valve core 5, the back air pressure cavity 14 and the driving air pressure cavity 13 are connected with an external air channel 16, and a first end face S1 of the driving piston 10 facing the sealing ring 11 is larger than a second end 2 of the driving piston.

Specifically, a buffer flow channel is formed between the fixed die valve body 1 and the movable die valve body 3, so that aluminum liquid flushed in the die casting die can be buffered in a decelerating way, the stroke of the driving piston 10 is determined by the length of the back-pulling air pressure cavity 14, the driving piston is generally shorter, the driving piston is only required to be opened by meeting the requirement of the vacuumizing channel 12, the vacuumizing channel 12 is a gap between the valve core 5 and the core-pulling block 4, the gap can be larger, the vacuumizing efficiency is ensured, and a vacuumizing interface 6 communicated with the vacuumizing channel 12 can be arranged at the top of the core-pulling block 4 for conveniently exhausting air.

In some embodiments, in order to guide the axial movement of the valve core 5, the guide sleeve 15 is installed inside the cylinder 8, the valve core 5 passes through the guide sleeve 15, the sealing ring 11 is installed on the end surface of the guide sleeve 15, a sealing groove can be arranged on the end surface of the guide sleeve 15 facing the driving piston 10, and the sealing ring 11 is embedded and installed in the sealing groove, wherein the guide sleeve 15 is installed at the position between the cylinder 8 and the core-pulling block 4, so that the connection strength between the cylinder 8 and the core-pulling block 4 can be enhanced.

The active air pressure cavity 13 and the pull-back air pressure cavity 14 are arranged in the same inner cavity of the cylinder body 8 but are not communicated, the diameter of the active air pressure cavity 13 is the same as the diameter of the rear half part of the active piston 10, and the diameter of the pull-back air pressure cavity 14 is the same as the diameter of the front end of the active piston 10 and is larger than the diameter of the active air pressure cavity 13.

The sealing ring 11 can be an O-shaped sealing ring, and only the first end surface S1 of the driving piston 10 and the sealing ring 11 need to be kept to be sealed, so that the gas in the pullback pneumatic cavity 14 can not enter the position of the first end surface S1, and the valve core 5 can be kept in an ejection state.

In order to facilitate the installation of the cylinder body 8, the first end of the cylinder body 8 is connected with the core pulling block 4, the second end of the cylinder body 8 stretches into and is installed in a coupling block 2, an oil cylinder can be installed at the rear side of the coupling block 2 and is connected with the cylinder body 8 through the coupling block 2, and the oil cylinder can enable the coupling block 2, the cylinder body 8 and the core pulling block 4 to synchronously act and draw out from between the fixed die valve body 1 and the movable die valve body 3.

Wherein, the second end of cylinder body 8 and shaft coupling piece 2 between the card go into and be provided with detachable cushion 7, cushion 7 can extract, makes things convenient for the installation of cylinder body 8, simultaneously, the lateral wall of shaft coupling piece 2 on install the selection plunger 9 that links to each other with cushion 7.

As a method for using the mechanical vacuum self-priming valve of the die casting die in this embodiment, the method specifically includes the following steps:

When the die casting die is assembled, pressure maintaining gas is always introduced into the back-pulling air pressure cavity 14, primary gas is introduced into the active air pressure cavity 13, so that the valve core 5 and the active piston 10 are pushed out forwards together, a vacuumizing channel 12 between the front end of the valve core 5 and the core pulling block 4 is opened, the inside of the active air pressure cavity 13 keeps consistent with the atmospheric pressure, the pressure maintaining gas in the back-pulling air pressure cavity 14 can enable the active piston 10 to be kept at the front end position of the back-pulling air pressure cavity 14, and at the moment, air in the die casting die can be pumped out through the vacuumizing interface 6 to realize vacuumizing;

When the front end of the valve core 5 is impacted by molten aluminum in the die casting die, the valve core 5 is pushed backwards, so that a vacuumizing channel 12 between the valve core 5 and the driving piston 10 is closed, and meanwhile, as the area of a first end face S1 of the driving piston 10 is larger than that of a second end face S2, pressure maintaining gas in the back-pulling pneumatic cavity 14 pulls the driving piston 10 and the valve core 5 back together, and the driving piston 10 is kept at the rear end position of the back-pulling pneumatic cavity 14, so that the vacuumizing channel 12 is kept in a closed state;

When the die casting die is closed again, primary gas is introduced into the active air pressure cavity 13 again, and the next vacuumizing is started, so that the cycle is performed.

Therefore, the technical scheme in the embodiment realizes the active opening and closing control of the valve body, avoids the dependence of the vacuumizing structure on the impact force of molten metal, is simple and convenient to operate, reduces the requirement on operators, has no wearing parts, and has better durability.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims

1. The utility model provides a mechanical vacuum self-priming valve of die casting die, its characterized in that includes cover half valve body (1) and is located movable mould valve body (3) of cover half valve body (1) downside, cover half valve body (1) and movable mould valve body (3) between one side install loose core piece (4), one side of loose core piece (4) install cylinder body (8), the internally mounted of cylinder body (8) have initiative piston (10), the internally mounted of loose core piece (4) have one end and initiative piston (10) continuous case (5), the other end of case (5) stretch into between cover half valve body (1) and the movable mould valve body (3), case (5) and loose core piece (4) between form vacuum pumping passageway (12) with outside intercommunication, the inside of cylinder body (8) be provided with initiative atmospheric pressure chamber (13) and the back atmospheric pressure chamber (14) that are located initiative piston (10) rear end outside, back atmospheric pressure chamber (14) inboard be close to (5) and be provided with case (16) and connect atmospheric pressure equal chamber (13), the area of a first end face (S1) of the driving piston (10) facing the sealing ring (11) is larger than the area of a second end face (S2) of the rear end of the driving piston (10).

2. The mechanical vacuum self-priming valve of a die casting mold of claim 1, wherein: the first end of the cylinder body (8) is connected with the core pulling block (4), and the second end of the cylinder body stretches into and is arranged in a coupling block (2).

3. The mechanical vacuum self-priming valve of a die casting mold of claim 2, wherein: a detachable cushion block (7) is clamped between the second end of the cylinder body (8) and the coupling block (2).

4. A mechanical vacuum self-priming valve for a die casting mold according to claim 3, wherein: a selection plunger (9) connected with the cushion block (7) is arranged on the side wall of the coupling block (2).

5. The mechanical vacuum self-priming valve of a die casting mold of claim 1, wherein: the top of the core pulling block (4) is provided with a vacuumizing interface (6) communicated with a vacuumizing channel (12).

6. The mechanical vacuum self-priming valve of a die casting mold of claim 1, wherein: the cylinder body (8) internally provided with a guide sleeve (15), the valve core (5) passes through the guide sleeve (15), and the sealing ring (11) is arranged on the end surface of the guide sleeve (15).

7. The mechanical vacuum self-priming valve of a die casting mold of claim 6, wherein: the guide sleeve (15) is arranged at the position between the cylinder body (8) and the core pulling block (4).