CN201539590U - Vacuum die-casting stop valve - Google Patents

Vacuum die-casting stop valve Download PDF

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Publication number
CN201539590U
CN201539590U CN2009201927141U CN200920192714U CN201539590U CN 201539590 U CN201539590 U CN 201539590U CN 2009201927141 U CN2009201927141 U CN 2009201927141U CN 200920192714 U CN200920192714 U CN 200920192714U CN 201539590 U CN201539590 U CN 201539590U
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China
Prior art keywords
spool
valve body
valve
vacuum die
stop valve
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Expired - Lifetime
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CN2009201927141U
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Chinese (zh)
Inventor
黎东峰
包昌强
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Individual
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Individual
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Abstract

The utility model discloses a vacuum die-casting stop valve, which relates to a stop valve. As flashes cumulate continuously to block in the gap between a valve core and a valve body, the valve body or the valve core is easy to be damaged and the motion of the valve core is not sensitive so that once an exhaust passage is not closed in time, liquid metal overflows into the vacuum air exhaust device to make the vacuum air exhaust device scrapped. The vacuum die-casting stop valve comprises a valve seat, an upper valve body, a lower valve body and a valve core, wherein the lower valve body and the upper valve body are positioned on the valve seat; and the upper end of the valve core passes through the lower valve body and can move in the lower valve body, while the lower end thereof is positioned in a cavity of the valve seat. The utility model is characterized in that the valve core is provided with an annular groove; the inside of the lower valve body is provided with a liquid passage; and the liquid passage passes through the valve core. The valve core is provided with the annular groove and the liquid passage is connected with the valve core so as to avoid the flashes continuously cumulating in the gap so as to protect the valve core and the valve body and prevent the valve core and the valve body from being pulled due to the flashes. And the oil flowing through the liquid passage has cooling and lubricating effects so as to be favorable for improving the sensitivity of the motion of the valve core and effectively prolong the service life of the vacuum die-casting stop valve.

Description

Vacuum die casting stop valve
[technical field]
The utility model relates to a kind of stop valve, refers to a kind of vacuum die casting stop valve especially.
[background technique]
Because die castings is to produce under high temperature, high pressure, at a high speed condition, the gas in the die cavity if not rapidly eliminating can cause unstable product quality, vacuum exhaust is the effective means that addresses this problem.Vaccum stop valve is the vacuum pumping system chief component, vaccum stop valve generally includes valve body, be located at air outlet flue and spool movably in the valve body, in the die casting incipient stage, the vaccum stop valve exhaust, gas is extracted out through air outlet flue, bleed in case finish, air outlet flue is in time closed in the spool action, and this moment, liquid metal can't be outside air outlet flue be spilled over to valve.In press casting procedure, pressure is higher, because spool and valve body are Spielpassung, liquid metal easily enters both gap locations, liquid metal forms harder metal overlap after cooling, overlap is constantly accumulated in the gap that is stuck between spool and the valve body, makes in the spool moving process and produces abrasive wear, causes valve body or spool to damage.On the other hand, after card had overlap in the gap of spool and valve body, spool action was insensitive, in case that air outlet flue is closed is untimely, liquid metal overflows into the vital qi air extractor outward will make it scrap.
[model utility content]
The technical assignment of the technical problems to be solved in the utility model and proposition is that the prior art scheme is improved and improved, and a kind of vacuum die casting stop valve is provided, and makes its wearing and tearing that can effectively prevent spool and valve body, guarantees the sensitivity of spool action.For this reason, the utility model is taked following technological scheme:
Vacuum die casting stop valve, comprise valve seat, upper valve body, following valve body and spool, following valve body and upper valve body are positioned at the valve seat top, and the spool upper end is passed down valve body and can be moved therein, the lower end is arranged in the cavity of valve seat, it is characterized in that: described spool is provided with circular groove; Offer a flow channel for liquids in the following valve body, flow channel for liquids is through spool.Circular groove on the spool is used for scraping and being contained in the overlap that press casting procedure produces, because flow channel for liquids process spool, in the valve core movement process, circular groove communicates with flow channel for liquids, thereby by flowing liquid overlap is discharged circular groove.Avoid the overlap accumulation to be sandwiched in the gap; the protection spool reaches valve body down, prevents that both from pulling because of overlap, and the fluid that flow channel for liquids is flowed through has cooling and lubrication; help to improve the sensitivity of spool action, effectively prolong the working life of vacuum die casting stop valve.The liquid of flow channel for liquids of flowing through can be: oil, saponification liquor, water etc.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature:
Described flow channel for liquids two ends extend in the valve seat wall and form liquid entering hole and liquid outlet on valve seats.Can form from left to right top-down flow channel for liquids.
The spool receiving cavity outer wall that accommodates spool in the described valve body down has an annular diversion trench, and described flow channel for liquids communicates with annular diversion trench; In the moving process, the circular groove on it can be relative with the guiding gutter of receiving cavity in the spool receiving cavity for spool.Liquid flows in the guiding gutter of spool cavity volume periphery, when guiding gutter and circular groove are established relative, intercommunication, overlap can be taken away in the lump when fluid is flowed through circular groove.
The liquid entering hole of described flow channel for liquids and one goes out oil pump and links to each other, and the liquid outlet of described flow channel for liquids links to each other with an oil well pump and prevents leakage to produce negative pressure in flow channel for liquids.Go out oil pump when extraction fluid enters flow channel for liquids from fuel tank, fuel tank is gone in the oil pumping in the valve of the oil well pump of big flow, the flow velocity that so can not only improve liquid is to increase the impact force to overlap, and can in flow channel for liquids, produce negative pressure, prevent that effectively liquid leakage from entering air outlet flue, even enter in the mold cavity and cause waste product spare to increase.
The liquid outlet of described oil well pump is connected with a cooler.Fluid to the stop valve of flowing through cools off, and reduces oil liquid temperature, and the temperature at fluid circulation time reduction once again stop valve reduces temperature distortion, improves the quality of fit between the part.
Described upper valve body is provided with air outlet flue with the junction plane of following valve body, and described spool comprises the active spool that is positioned at the air outlet flue entrance point and be positioned at the driven spool of air outlet flue outlet end that described active spool is by a continuous action device and the interlock of driven spool.At press casting procedure, liquid metal impacts at first initiatively that spool retreats it, and initiatively spool drives driven spool by continuous action device and moves ahead and make its sealing air outlet flue outlet when retreating.This moment, liquid metal can not move ahead again, and after pressurize, the cooling, the waste material that takes out in material feeding mouth and the air outlet flue gets final product.
Described continuous action device comprises that the active tooth bar that is fixed in the active spool, the driven tooth bar that is fixed in driven spool reach the gear that is used for transferring power between two tooth bars.Drive when initiatively spool retreats and initiatively tooth bar engaging gear rotation, gear rotates the driven tooth bar that drive is engaged with and moves ahead, and makes the outlet of driven spool sealing air outlet flue.
Described continuous action device comprises the transmission levers that is connected to down valve body with jack shaft; Described transmission levers is positioned at the down valve seat cavity of valve body below, pegs graft respectively and be located in the groove on the initiatively spool and driven spool in its two ends.Two arm lengths of transmission levers can determine that stroke adjustment is comparatively convenient according to the working stroke of spool.To drive transmission levers be that rotate at the center with the shaft contact to groove when the active spool retreats, and makes driven spool up.
The groove of described spool is " V " shape groove, and the groove bottom is provided with the joint that matches with transmission levers." V " shape groove can prevent that transmission levers from producing movement interference with spool in swing process.
The head of described active spool is a cylindricality guide portion of establishing circular groove, and its afterbody is the linkage part of establishing groove; The head of described driven spool for can in stretch in a cylindricality closure of being located at the exhaust port of upper valve body, described guide portion is connected with the cylindricality guide portion of establishing circular groove, its afterbody is the linkage part of establishing groove, and the closure diameter connects with the conical surface transition between the two less than guide portion.Guide portion is used at following valve body positioning and guiding, and guide portion is a Spielpassung with the spool receiving cavity of following valve body, so that it can move in receiving cavity.Overlap is entered by the guide portion of spool head, establishes circular groove in guide portion, forms upper and lower two parallel circular arc limits, and the overlap that adheres to receiving cavity is easily scraped in the moving process on two arc limits to be entered in the circular groove.The closure diameter of driven spool is less than guide portion, connects with the conical surface transition between the two, and the conical surface exhaust port of better fitting can play the effect of better sealing.
Beneficial effect: spool is provided with circular groove; flow channel for liquids and spool join; avoiding overlap constantly to accumulate is sandwiched in the gap; protection spool and valve body; prevent that both from pulling because of overlap; and the fluid that flow channel for liquids is flowed through has cooling and lubrication, helps to improve the sensitivity of spool action, effectively prolongs the working life of vacuum die casting stop valve.
[description of drawings]
Fig. 1 is a sectional structure schematic representation of the present utility model.
Fig. 2 is an aggressive valve cored structure schematic representation.
Fig. 3 is a servo valve cored structure schematic representation.
Fig. 4 is the oil-way system schematic diagram.
Wherein: the 1-upper valve body; The 2-material feeding mouth; Valve body under the 3-; 4-is spool initiatively; The 5-transmission levers; The 6-spring holder; 7-adjusts spring; The 8-spring seat; The 9-Returnning spring; The 10-valve seat; The 11-liquid outlet; 12-closes valve lever; The 13-liquid entering hole; 14-closes the valve cylinder; The driven spool of 15-; The 16-exhaust port; The 17-vacuum tube joint; The 18-circular groove; The 19-groove; The 20-guiding gutter; The 21-flow channel for liquids; The 22-air outlet flue.
[embodiment]
Below in conjunction with Figure of description the technical solution of the utility model is described in further detail.
As shown in Figure 1, the utility model comprises valve seat 10, upper valve body 1, following valve body 3 and spool, following valve body 3 and upper valve body 1 are positioned at valve seat 10 tops, the spool upper end is passed down valve body 3 and can be moved therein, the lower end is arranged in the cavity of valve seat 10, is provided with overflow material liftout mechanism in valve seat 10 and the following valve body 3.Spool is provided with circular groove 18; Offer a flow channel for liquids 21 in the following valve body 3, flow channel for liquids 21 is through spool.The flow channel for liquids two ends extend in valve seat 10 walls and form liquid entering hole 13 and liquid outlet 11 on valve seats 10, form from left to right top-down flow channel for liquids.The spool receiving cavity outer wall that accommodates spool in the following valve body 3 has an annular diversion trench 20, and flow channel for liquids 21 communicates with annular diversion trench 20; In the moving process, the circular groove 18 on it can be relative with the guiding gutter 20 of receiving cavity in the spool receiving cavity for spool.Continuous action device comprises that the active tooth bar that is fixed in active spool 4, the driven tooth bar that is fixed in driven spool 15 reach the gear that is used for transferring power between two tooth bars.Continuous action device adopts another kind of structure in the present embodiment: it comprises the transmission levers 5 that is connected to down valve body 3 with jack shaft; Transmission levers 5 is positioned at down valve seat 10 cavitys of valve body 3 belows, pegs graft respectively and be located in the groove 19 on the initiatively spool 4 and driven spool 15 in its two ends.The groove 19 of spool is " V " shape groove, and the groove bottom is provided with the joint that matches with transmission levers 5.Initiatively spool 4 upper ends are near suction port 2, and the lower end is connected with transmission levers 5; Driven spool 15 upper ends are near exhaust port 16, and the lower end is connected with transmission levers 5.Form initiatively spool 4---transmission levers a 5---driving mechanism of driven spool 15.Be equipped with on the seat of stop valve 10 and close valve cylinder 14, close valve lever 12.An end that closes valve lever 12 near driven spool 15, one ends near closing valve cylinder 14,---the pass valve lever 12---driving mechanism of driven spool 15 that forms a pass valve cylinder 14.
As shown in Figure 2, initiatively the head of spool 4 is the cylindricality guide portion that is provided with circular groove 18, and its afterbody is the linkage part that is provided with groove 19.
As shown in Figure 3, the head of driven spool 15 for can in stretch in the cylindricality closure of exhaust port 16, the guide portion rear end is provided with the cylindricality guide portion that be provided with circular groove 18 of diameter greater than closure, and its afterbody is the linkage part that is provided with groove 19, is connected with the conical surface transition between closure and the cylindricality guide portion.
As shown in Figure 4, the liquid entering hole 13 and of vaccum stop valve goes out oil pump and links to each other, and the liquid outlet 11 of vaccum stop valve is connected with an oil well pump, is provided with a cooler between oil well pump and the fuel tank, enters cooler for preventing foreign material such as overlap, sets up a filter.Fuel-displaced pump work, oil suction liquid is gone into the flow channel for liquids liquid entering hole 13 of vaccum stop valve from fuel tank by filter, then under the effect of oil well pump, goes into fuel tank from flow through filter, cooler of the flow channel for liquids liquid outlet 11 of vaccum stop valve.
Working procedure:
(1) matched moulds
Form an air outlet flue 22 between following valve body 3 and the upper valve body 1: material feeding mouth 2---air outlet flue 22---exhaust port 16---vacuum tube joint 17.Material feeding mouth 2 is connected with mold cavity, and wherein air outlet flue 22 is wave-like type, and thickness reaches more than the 3mm; The backhaul push rod is depressed spring seat 8, makes initiatively spool 4 and spring seat 8 disengagements, and transmission levers 5 withstands by spring holder 6 by adjusting spring 7, and driven spool 15 sucts when preventing to begin to bleed, and inserts exhaust port 16.Form a large-section air outlet flue 22 between following valve body 3 and the upper valve body 1.
(2) mold filling
When arriving the active spool 4 of vaccum stop valve after the high speed molten metal is full of mold cavity, impact initiatively spool 4, initiatively spool 4 is depressed, and drives on driven spool 15 tops by transmission levers 5, inserts exhaust port 16, and vaccum stop valve is closed.When the high speed molten metal arrived exhaust port 16 by wave-like type air outlet flue 22, vaccum stop valve was closed.In matched moulds and mold filling process, constantly from vacuum tube joint 17, bleed.
(3) pressurize, cooling
In three above-mentioned processes, fluid in the fuel tank is dirty in filter in the pull of vacuum effect that goes out oil pump, constantly enter the flow channel for liquids 21 from liquid entering hole 13, make to have the fluid that flows in the circular groove 18 of spool receiving cavity periphery, enter flow channel for liquids 21 after the overlap that enters the spool gap location is scraped by circular groove 18 and discharge with oil.For fluid is not leaked outside, portion has additional oil well pump at oil outlet tube, and the oil well pump of big flow makes oil-way system form negative pressure at the vaccum stop valve place, prevents that oil leak from going into mold cavity.For reducing the oil temperature, also can set up a cooler in oil outlet tube portion, the fluid that cools off through cooler finally enters fuel tank, so constantly circulation.Oil-way system also plays lubricated initiatively spool 4 and driven spool 15, the effect of cooling stop valve simultaneously.
(4) die sinking
In the die sinking process, spring seat 8 is jack-up under the effect of Returnning spring 9, drives initiatively spool 4 jack-up, is arranged in the overflow material of air outlet flue 22 and material feeding mouth 2 in the ejector valve.Initiatively spool 4 is return by the driven spool 15 of transmission levers 5 drives.Vaccum stop valve enters next circulation.
(5) when die debugging, close valve cylinder 14 and drive on driven spool 15 tops by closing valve lever 12, insert exhaust port 16, vaccum stop valve is closed.
Vacuum die casting stop valve shown in above Fig. 1-4 is a specific embodiment of the utility model; the utility model substantive distinguishing features and progress have been embodied; can be according to the use needs of reality; under enlightenment of the present utility model; it is carried out the equivalent modifications of aspects such as shape, structure, all at the row of the protection domain of this programme.

Claims (10)

1. vacuum die casting stop valve, comprise valve seat (10), upper valve body (1), following valve body (3) and spool, following valve body (3) and upper valve body (1) are positioned at valve seat (10) top, the spool upper end is passed down valve body (3) and can be moved therein, the lower end is arranged in the cavity of valve seat (10), it is characterized in that: described spool is provided with circular groove (18); Offer a flow channel for liquids (21) in the following valve body (3), flow channel for liquids (21) is through spool.
2. vacuum die casting stop valve according to claim 1 is characterized in that: described flow channel for liquids two ends extend in valve seat (10) wall and at valve seat (10) and go up formation liquid entering hole (13) and liquid outlet (11).
3. vacuum die casting stop valve according to claim 2 is characterized in that: the spool receiving cavity outer wall that accommodates spool in the described valve body (3) down has an annular diversion trench (20), and described flow channel for liquids (21) communicates with annular diversion trench (20); In the moving process, the circular groove on it (18) can be relative with the guiding gutter (20) of receiving cavity in the spool receiving cavity for spool.
4. vacuum die casting stop valve according to claim 3, it is characterized in that: the liquid entering hole (13) and of described flow channel for liquids (21) goes out oil pump and links to each other, and the liquid outlet (11) of described flow channel for liquids (21) links to each other with an oil well pump and prevents leakage to produce negative pressure in flow channel for liquids (21).
5. vacuum die casting stop valve according to claim 4 is characterized in that: the liquid outlet of described oil well pump (11) is connected with a cooler.
6. according to the described vacuum die casting stop valve of the arbitrary claim of claim 1-5, it is characterized in that: described upper valve body (1) is provided with air outlet flue (22) with the junction plane of following valve body (3), described spool comprises the active spool (4) that is positioned at air outlet flue (22) entrance point and is positioned at the driven spool (15) of air outlet flue (22) outlet end that described active spool (4) is by a continuous action device and driven spool (15) interlock.
7. vacuum die casting stop valve according to claim 6 is characterized in that: described continuous action device comprises that the active tooth bar that is fixed in active spool (4), the driven tooth bar that is fixed in driven spool (15) reach the gear that is used for transferring power between two tooth bars.
8. vacuum die casting stop valve according to claim 6 is characterized in that: described continuous action device comprises the transmission levers (5) that is connected to down valve body (3) with jack shaft; Described transmission levers (5) is positioned at down valve seat (10) cavity of valve body (3) below, pegs graft respectively and be located in the groove (19) on the initiatively spool (4) and driven spool (15) in its two ends.
9. vacuum die casting stop valve according to claim 8 is characterized in that: the groove of described spool (19) is " V " shape groove, and the groove bottom is provided with the joint that matches with transmission levers (5).
10. vacuum die casting stop valve according to claim 9 is characterized in that: the head of described active spool (4) is for establishing the cylindricality guide portion of circular groove (18), and its afterbody is for establishing the linkage part of groove (19); The head of described driven spool (15) for can in stretch in a cylindricality closure of being located at the exhaust port (16) of upper valve body, described guide portion is connected with the cylindricality guide portion of establishing circular groove (18), its afterbody is for establishing the linkage part of groove (19), the closure diameter connects with the conical surface transition between the two less than guide portion.
CN2009201927141U 2009-08-19 2009-08-19 Vacuum die-casting stop valve Expired - Lifetime CN201539590U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660609B (en) * 2009-08-19 2011-07-13 黎东峰 Vacuum die casting stop valve
WO2012006801A1 (en) * 2010-07-16 2012-01-19 Bao Changqiang Anti-sticking cut-off system for vacuum die-casting
CN115446282A (en) * 2022-08-31 2022-12-09 广州市型腔模具制造有限公司 Ultra-large integrated die-casting vacuum control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660609B (en) * 2009-08-19 2011-07-13 黎东峰 Vacuum die casting stop valve
WO2012006801A1 (en) * 2010-07-16 2012-01-19 Bao Changqiang Anti-sticking cut-off system for vacuum die-casting
CN115446282A (en) * 2022-08-31 2022-12-09 广州市型腔模具制造有限公司 Ultra-large integrated die-casting vacuum control method
CN115446282B (en) * 2022-08-31 2023-06-06 广州市型腔模具制造有限公司 Ultra-large integrated die casting vacuum control method

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20100804

Effective date of abandoning: 20090819