Control valve for vacuum-pumping type compression mod
Technical field
The invention belongs to technical field of mold, specifically, particularly to a kind of control valve for vacuum-pumping type compression mod。
Background technology
At present, the processing of the product such as crankcase, change speed gear box generally adopts vacuum-pumping type compression mod to realize, and the opportunity of this casting die vacuumizing is by vacuum valve control。Washboard is board-like or industry universal vacuum valve is primarily present following deficiency for tradition:
1, sectional area of bleeding is too little, it is impossible to reach to be fully drawn out the purpose of type intracavity gas within the short time (30-80ms) of aluminum liquid filling mold cavity, if increasing section amasss, aluminum liquid easily runs in pump-line and causes plugging fault。
2, the shut-in time of vacuum valve is difficult to control to, and closes and too early does not reach to fill the purpose that type overall process is bled, it is impossible to realizes the effect of evacuation;Close and can cause too late causing line clogging fault in aluminum liquid entrance pump-line。
3, traditional vacuum valve failure-frequency is high, has had a strong impact on production efficiency。
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of control valve for vacuum-pumping type compression mod。
Technical solution of the present invention is as follows: a kind of control valve for vacuum-pumping type compression mod, it is characterised in that: on evacuating plate, offer the first bleed-off passage extended from front to back, the front end face of the through evacuating plate in front end of described first bleed-off passage;
The first vertical core is had in the front portion of described evacuating plate, the upper port of this first vertical core communicates with the first bleed-off passage, the bottom surface of the through evacuating plate of lower port of the first vertical core, the second vertical core is had at the rear portion of described evacuating plate, the upper port of the second vertical core connects with the rear end of described first bleed-off passage, the bottom surface of the through evacuating plate of lower port of the second vertical core, and the rear end of described evacuating plate has cross-drilled hole, the front port of this cross-drilled hole and the connection of the second vertical core, the rear end face of the through evacuating plate of rear port of cross-drilled hole;
The first oil cylinder and the second oil cylinder it is arranged side by side in the lower section of described evacuating plate, the rod chamber connection by the first oil duct and the second oil cylinder of the rod chamber of the first oil cylinder, the rodless cavity connection by the second oil duct and the second oil cylinder of the rodless cavity of the first oil cylinder, the piston rod of described first oil cylinder stretches in the first vertical core straight up, the piston rod of the second oil cylinder stretches in the second vertical core straight up, and be connected with spool, described spool can move up and down under the drive of the second cylinder piston rod, makes the path between the first bleed-off passage and cross-drilled hole disconnect or conducting。
The present invention is arranged on the side of mould, and the second bleed-off passage that the front end of the first bleed-off passage is arranged by die top connects with the die cavity of mould, and the rear port of cross-drilled hole is connected with vacuum pumping pump by pipeline。When aluminum liquid filling mold cavity, vacuum pumping pump is by the cross-drilled hole on evacuating plate, second vertical core, the die cavity of mould is carried out evacuation by the second bleed-off passage on the first bleed-off passage and mould, after aluminum liquid is full of mold cavity, aluminum liquid flows along the second bleed-off passage to the first bleed-off passage on evacuating plate, aluminum liquid stream is when the first vertical core position, the piston rod of the first oil cylinder can be applied downward pressure, automatically the piston rod triggering the first oil cylinder moves downward, utilize the principle of linker, the piston rod of the first oil cylinder promotes the piston rod of the second oil cylinder to move upward by hydraulic oil, spool is made to close the path between the first bleed-off passage and cross-drilled hole。Owing to when aluminum liquid touches the piston rod of the first oil cylinder, mold cavity is fully populated with, thus ensure that filling overall process evacuation, it is to avoid the problem that traditional vacuum valve is difficult to control to the shut-in time。
First bleed-off passage is the groove being formed at evacuating plate upper surface, and this groove part between the first vertical core and the second vertical core is snakelike or serpentine or " W " shape。The the first bleed-off passage moulding of above structure is simple, being prone to processing and fabricating, the first bleed-off passage can be deepened, expand area of bleeding, and can extend aluminum liquid flows to the time of the second vertical core as far as possible from the first vertical core simultaneously, to avoid aluminum liquid to enter in the second vertical core, thus preventing the generation of fault。
As preferably, the rectangular chamber of front end dilatation of described first bleed-off passage, this rectangular chamber is connected with the die cavity of mould by multiple the second bleed-off passages being parallel to each other。
In order to simplify structure, it is simple to processing and fabricating, described first vertical core and the second vertical core are each perpendicular to the first bleed-off passage, and described cross-drilled hole is perpendicular to the second vertical core。
As preferably, described first oil duct and the second oil duct are the linear structure being parallel to each other, and each oil duct is each perpendicular to the piston rod of the first oil cylinder。
In order to make structure compacter, the cylinder body of described first oil cylinder and the cylinder body of the second oil cylinder are wall type integrative-structure altogether, offer the first oil duct and the second oil duct on common wall。
For the ease of assembling, the cylinder body of described first oil cylinder and the cylinder body of the second oil cylinder are Split type structure, and the cylinder body of the first oil cylinder is connected by the cylinder body of two oil pipes and the second oil cylinder, and the endoporus of these two oil pipes is respectively formed as the first oil duct and the second oil duct。
The invention has the beneficial effects as follows:
1, due to when aluminum liquid touches the piston rod of the first oil cylinder mold cavity be fully populated with, thus ensure that filling overall process evacuation, it is to avoid the problem that traditional vacuum valve is difficult to control to the shut-in time。
2, the bleed-off passage on evacuating plate can be deepened, expand area of bleeding, and aluminum liquid can be avoided to enter pump-line, thus preventing the generation of fault simultaneously。
3, touching to shut-in time of the second cylinder piston rod of the first cylinder piston rod is spaced apart the key parameter of the present invention, can be adjusted by the distance that aluminum liquid stream between the diameter of two cylinder piston rods and two-piston bar is dynamic, adjust easy to operate, various evacuation compression mods can be applicable to, use in extensive range。
4, simple in construction, enforcement is easy, cost is low, the closedown controlling pump-line does not provide power by other mechanical part or electric component, and not only automaticity is high, accurate reliability is good, and fault-free produces, and is effectively increased production efficiency。
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the invention。
Fig. 2 is the A-A sectional view of Fig. 1, be also pump-line open schematic diagram。
Fig. 3 is the closedown schematic diagram of pump-line。
Fig. 4 is the top view of the present invention。
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 2, Figure 3 and Figure 4, mould 4 is evacuation compression mod, and this mould 4 carries die cavity 41, and the shape size of die cavity 41 and machined product adapt。Offer the second bleed-off passage 42 at the top of mould 4, the second bleed-off passage 42 preferably forms in the groove of mould 4 end face, and the second bleed-off passage 42 can be one, it is also possible to multiple for what be parallel to each other。One of second bleed-off passage 42 connects with die cavity 41, the end face of the through mould 4 in other end of the second bleed-off passage 42。
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, evacuating plate 1 is installed on the side of mould 4, this evacuating plate 1 offers the first bleed-off passage 11 extended from front to back, first bleed-off passage 11 is the groove being formed at evacuating plate 1 upper surface, and the first bleed-off passage 11 and the second bleed-off passage 42 are preferably placed in same level。The rectangular chamber 15 of front end dilatation of the first bleed-off passage 11, this rectangular chamber 15 is connected with the die cavity 41 of mould 4 by the second bleed-off passage 42。
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the first vertical core 12 is had in the front portion of evacuating plate 1, this first vertical core 12 is perpendicular to the first bleed-off passage 11, the bottom surface of through first bleed-off passage 11 of upper port of the first vertical core 12, the first vertical core 12 is made to communicate with the first bleed-off passage 11, the bottom surface of the through evacuating plate 1 of lower port of the first vertical core 12。The second vertical core 13 is had at the rear portion of evacuating plate 1, second vertical core 13 is also perpendicularly to the first bleed-off passage 11, the bottom surface of through first bleed-off passage 11 of upper port of the second vertical core 13, the second vertical core 13 is made to connect with the rear end of the first bleed-off passage 11, the bottom surface of the through evacuating plate 1 of lower port of the second vertical core 13。First bleed-off passage 11 part between the first vertical core 12 and the second vertical core 13 is snakelike or serpentine or " W " shape or other shape being suitable for。Having cross-drilled hole 14 in the rear end of evacuating plate 1, this cross-drilled hole 14 is positioned at the back lower place of the first bleed-off passage 11, and cross-drilled hole 14 is perpendicular to the second vertical core 13。Front port and second vertical core 13 of cross-drilled hole 14 connect, the rear end face of the through evacuating plate 1 of rear port of cross-drilled hole 14, and are connected with vacuum pumping pump 3 by pipeline。
As shown in Figure 2, Figure 3 and Figure 4, the first oil cylinder 5 and the second oil cylinder 6 it is arranged side by side in the lower section of evacuating plate 1, the rod chamber of the first oil cylinder 5 is connected with the rod chamber of the second oil cylinder 6 by the first oil duct 7, the rodless cavity of the first oil cylinder 5 is connected with the rodless cavity of the second oil cylinder 6 by the second oil duct 8, first oil duct 7 and the second oil duct 8 are the linear structure being parallel to each other, and each oil duct is each perpendicular to the piston rod of the first oil cylinder 5。The set-up mode of the first oil cylinder 5 and the second oil cylinder 6 has two kinds, one: the cylinder body of the first oil cylinder 5 and the cylinder body of the second oil cylinder 6 are wall type integrative-structure altogether, offer the first oil duct 7 and the second oil duct 8 on common wall;The cylinder body of its two: the first oil cylinder 5 and the cylinder body of the second oil cylinder 6 are Split type structure, and the cylinder body of the first oil cylinder 5 is connected by the cylinder body of two oil pipes and the second oil cylinder 6, and the endoporus of these two oil pipes is respectively formed as the first oil duct 7 and the second oil duct 8。The piston rod of the first oil cylinder 5 stretches in the first vertical core 12 straight up, and when the piston rod of the first oil cylinder 5 is positioned at peak, the bottom surface of its end face and the first bleed-off passage 11 is concordant。The piston rod of the second oil cylinder 6 stretches in the second vertical core 13 straight up, and is connected with spool 9, and spool 9 can move up and down under the drive of the second oil cylinder 6 piston rod, makes the path between the first bleed-off passage 11 and cross-drilled hole 14 disconnect or conducting。
The operation principle of the present invention is as follows:
When aluminum liquid filling mold cavity 41, vacuum pumping pump 3 is by the cross-drilled hole 14 on evacuating plate 1, second vertical core 13, the die cavity 41 of mould is carried out evacuation by the second bleed-off passage 42 on the first bleed-off passage 11 and mould 4, after aluminum liquid is full of mold cavity 41, aluminum liquid flows along the second bleed-off passage 42 to the first bleed-off passage 11 on evacuating plate 1, aluminum liquid stream is when the first vertical core 12 position, the piston rod of the first oil cylinder 5 can be applied downward pressure, automatically the piston rod triggering the first oil cylinder 5 moves downward, utilize the principle of linker, the piston rod of the first oil cylinder 5 promotes the piston rod of the second oil cylinder 6 to move upward by hydraulic oil, spool 9 is made to move to peak, close the path between the first bleed-off passage 11 and cross-drilled hole 14。When needing to reopen the path between the first bleed-off passage 11 and cross-drilled hole 14, only need to be equipped with a return mechanism and spool 9 is depressed reset。
The preferred embodiment of the present invention described in detail above。Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work。Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment。