CN205315766U - Gear diaphragm type vacuum valve for die -casting - Google Patents

Abstract

The utility model relates to a diaphragm cutting device technical field, the utility model discloses a gear diaphragm type vacuum valve for die -casting, which comprises the following components: a valve body, the diaphragm, the valve rod, the valve rod endotheca is in the valve body, the diaphragm is connected to the valve rod lower extreme, the diaphragm below is equipped with the case, the both sides of case is equipped with air inlet and gas outlet respectively, air inlet and gas outlet through the case and the diaphragm between the clearance be linked together, be equipped with the rack on the valve rod, valve rod one side person has the gear with this rack matched with, the oblique top of gear is equipped with the pawl with this gear matched with. Adopting this scheme, having moved on to the valve body outside with driving part, valve rod and valve body are ordinary slip, and the surface is smooth, can not pile up the flying dust, is convenient for rinse, and the while has also prevented the extra damage that many valve rods of flying dust and valve body led to the fact.

Description

Die casting gear diaphragm type vacuum valve

Technical field

This utility model relates to barrier film shearing device technical field.

Background technology

Vacuum die-casting method is to be extracted out by the gas in die cavity, and molten metal is filling die cavity under vacuum conditions, thus the gas being involved in is few, and the mechanical property of foundry goods is high, and the advantage that evacuated die-casting process is inherited and maintained common casting die. Its vacuum is at 52-82KPa(380-600mmHg) scope in, such vacuum can be obtained by mechanical pump, can be higher with complicated die casting vacuum level requirements for thin-walled. Evacuated die-casting process has the advantage that vacuum die-casting method can eliminate or reduce the pore of inside die-casting part, improves mechanical performance and the surface quality of die casting, improves plating performance; Vacuum die-casting method greatly reduces the counter-pressure of die cavity, can use the alloy that relatively low ratio is pressed and casting character is poor, it is possible to the bigger foundry goods of small machine die casting; Vacuum die-casting method improves filling condition, can the relatively thin foundry goods of die casting; Vacuum die-casting method is compared with common pressure casting method, and production efficiency is about the same.

Evacuated die-casting process needs to reach required vacuum in a short period of time, therefore forevacuum system must first be designed, wherein vacuum valve is an indispensable part in forevacuum system, it controls the sealing of whole device, control the extraction effect of this evacuation, indirectly control the quality of foundry goods. A kind of barrier film vacuum valve used at present, including valve rod, barrier film, handwheel, valve rod is connected with handwheel, slide bar is threaded on valve body, barrier film is positioned at the underface of valve rod and the surface of spool, and rotation hand wheel band ovable valve stem rotates and moves down, valve rod presses against diaphragm, make barrier film and the laminating of spool precision, cut off air inlet and gas outlet realizes closing. But, the working environment of die casting generally all compares badly, there is a lot of dust, adopt this structure, vacuum valve is in long-term use procedure, it is divided into and is easily accessible in valve body, dust accumulation goes out at thread pitch, not easy-clear, and dust can hurt valve rod and body cavity, accelerate part aging, make part durability reduce.

Utility model content

This utility model is intended to provide one to avoid dust to pile up in valve body, it is easy to clean the die casting gear diaphragm type vacuum valve of valve inner, to improve the durability of vacuum valve.

Die casting in this programme gear diaphragm type vacuum valve, including valve body, barrier film, valve rod, being placed in valve body in described valve rod, valve rod lower end connects barrier film, and barrier film is connected with spool, gap is left between spool and barrier film, the both sides of described spool is respectively equipped with air inlet and gas outlet, air inlet and gas outlet and is connected by above-mentioned gap, and described valve rod is provided with tooth bar, valve rod is provided with the gear matched with this tooth bar on one side, the ratchet that the oblique upper of gear is provided with and this gear matches.

Beneficial effect: valve rod is propped up under its own resilient effect of barrier film, leaves space between barrier film and spool, air inlet connects with gas outlet, and valve body is in opening; Swing pinion, by moving down with the tooth bar mating band ovable valve stem on valve rod, thus under press barrier film, be that barrier film deforms, fit tightly with spool, having cut off air inlet and gas outlet, reached closed mode, ratchet is it can be avoided that gear reversely rotates, the state of turning off is able to maintain that, moving ratchet makes it rotate 180 °, and ratchet cannot pass through its limiting gear of self gravitation such that it is able to reversely rotates gear and realizes the unlatching of vacuum valve. Adopting the program, had been moved to by drive part outside valve body, valve rod and valve body are common slip, and smooth surface will not pile up flying dust, it is simple to clean, and also prevent the many valve rods of flying dust and excessive wear that valve body causes simultaneously.

Further, between described valve body and barrier film by one telescopic joint, the bottom of valve body and the top of barrier film are all placed in sleeve pipe, and carry out spacing with convex shoulder, valve rod and barrier film are connected big one, it is to avoid valve rod and barrier film misplace, sealing effectiveness is bad, adopt convex shoulder to carry out limit mounting simultaneously, easy for installation, also allow for dismounting.

Further, described valve body includes upper valve body and lower valve body, the edge of barrier film is sandwiched between upper valve body and lower valve body, upper valve body and lower valve body adopt bolt to be attached, and valve body is split as upper and lower valve body, it is simple to manufacture and install, also allow for the replacing of part simultaneously, the edge of barrier film is clamped by upper and lower valve body, it is to avoid barrier film misplaces, and improves the reliability of this vacuum valve further.

Further, air inlet on described valve body and gas outlet and external pipe adopt Flange joint, and Flange joint ensure that good air-tightness.

Further, described gear face is provided with the handle of swing pinion, facilitates operative, and the speed of swing pinion is faster.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model die casting gear diaphragm type vacuum valve embodiment.

Detailed description of the invention

Below by detailed description of the invention, this utility model is described in further detail:

Accompanying drawing labelling in Figure of description includes: lower valve body 1, spool 11, air inlet 12, gas outlet 13, upper valve body 2, valve rod 21, tooth bar 211, barrier film 3, gear 4, handle 41, ratchet 42.

Embodiment is substantially as shown in Figure 1: the gear diaphragm type vacuum valve of the die casting in this programme, including valve body, barrier film 3, valve rod 21, it is placed in upper valve body 2 in valve rod 21, valve rod 21 lower end connects barrier film 3, barrier film 3 spool 11 arranged below, spool 11 and lower valve body 1 adopt one-body molded structure, the both sides of spool 11 to have air inlet 12 and gas outlet 13, air inlet 12 and gas outlet 13 to be connected by the gap between spool 11 and barrier film 3.

On valve rod 21, processing has tooth bar 211, valve rod 21 has the gear 4 matched with this tooth bar 211 on one side, gear 4 end face is welded with the handle of swing pinion 4, the ratchet 42 that the upper right side of gear 4 is arranged above and this gear 4 matches, this ratchet 42 carrys out position limited gear 4 by self gravitation, is that gear 4 can only rotate counterclockwise.

Between valve body and barrier film 3 by one telescopic joint, the bottom of valve body and the top of barrier film 3 are all placed in sleeve pipe, and carry out spacing with convex shoulder, by valve rod 21 and barrier film 3 even big one, avoiding valve rod 21 and barrier film 3 to misplace, sealing effectiveness is bad, adopts convex shoulder to carry out limit mounting simultaneously, easy for installation, also allow for dismounting. The edge of barrier film 3 is sandwiched between upper valve body 2 and lower valve body 1, upper valve body 2 and lower valve body 1 adopt bolt to be attached, valve body is split as upper and lower valve body 1, it is easy to manufacture and install, also allow for the replacing of part simultaneously, the edge of barrier film 3 is clamped by upper and lower valve body 1, it is to avoid barrier film 3 misplaces, and improves the reliability of this vacuum valve further.

Being welded with handle 41 on gear 4 end face, it is simple to the rotation of gear 4, air inlet 12 on valve body and gas outlet 13 and external pipe adopt Flange joint, and Flange joint ensure that good air-tightness.

Operation principle: valve rod 21 is propped up under its own resilient effect of barrier film 3, leaves space between barrier film 3 and spool 11, air inlet 12 connects with gas outlet 13, and valve body is in opening; Swing pinion 4, by moving down with the tooth bar 211 mating band ovable valve stem 21 on valve rod 21, thus pressing down barrier film 3, barrier film 3 is made to deform, fit tightly with spool 11, having cut off air inlet 12 and gas outlet 13, reached closed mode, ratchet 42 is it can be avoided that gear 4 reversely rotates, the state of turning off is able to maintain that, moving ratchet 42 makes it rotate 180 °, and ratchet 42 cannot pass through its limiting gear 4 of self gravitation such that it is able to reversely rotates gear 4 and realizes the unlatching of vacuum valve.

Above-described is only embodiment of the present utility model, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this. Should be understood that; for a person skilled in the art, under the premise without departing from this utility model structure, it is also possible to make some deformation and improvement; these also should be considered as protection domain of the present utility model, and these are all without affecting effect and the practical applicability that this utility model is implemented. The protection domain that this application claims should be as the criterion with the content of its claim, and the detailed description of the invention in description etc. records the content that may be used for explaining claim.

Claims (5)

1. a die casting gear diaphragm type vacuum valve, including valve body, barrier film, valve rod, it is placed in valve body in described valve rod, valve rod lower end connects barrier film, barrier film is connected with spool, gap is left between spool and barrier film, the both sides of described spool is respectively equipped with air inlet and gas outlet, air inlet is connected by above-mentioned gap with gas outlet, it is characterized in that: described valve rod is provided with tooth bar, valve rod is provided with the gear matched with this tooth bar on one side, the ratchet that the oblique upper of gear is provided with and this gear matches.

2. die casting gear diaphragm type vacuum valve according to claim 1, it is characterised in that: telescopic joint by one between described valve body and barrier film, the bottom of valve body and the top of barrier film are all placed in sleeve pipe, and carry out spacing with convex shoulder.

3. die casting gear diaphragm type vacuum valve according to claim 2, it is characterised in that: described valve body includes upper valve body and lower valve body, and the edge of barrier film is sandwiched between upper valve body and lower valve body, and upper valve body and lower valve body adopt bolt to be attached.

4. die casting gear diaphragm type vacuum valve according to claim 3, it is characterised in that: air inlet on described valve body and gas outlet and external pipe adopt Flange joint.

5. die casting gear diaphragm type vacuum valve according to claim 4, it is characterised in that: described gear face is provided with the handle of swing pinion.