CN105689678A - Communicating type die-casting die vacuumizing control device - Google Patents
Communicating type die-casting die vacuumizing control device Download PDFInfo
- Publication number
- CN105689678A CN105689678A CN201610156042.3A CN201610156042A CN105689678A CN 105689678 A CN105689678 A CN 105689678A CN 201610156042 A CN201610156042 A CN 201610156042A CN 105689678 A CN105689678 A CN 105689678A
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- CN
- China
- Prior art keywords
- oil cylinder
- vertical core
- bleed
- passage
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004512 die casting Methods 0.000 title abstract 2
- 238000005266 casting Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005429 filling process Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 66
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 17
- 239000007788 liquid Substances 0.000 description 17
- 230000000740 bleeding effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 241000510097 Megalonaias nervosa Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a communicating type die-casting die vacuumizing control device. A first air exhaust channel is formed on an air exhaust plate, and the front end of the first air exhaust channel communicates with a cavity of a die through a second air exhaust channel arranged at the top of the die. A first vertical hole is formed in the front portion of the air exhaust plate, and a second vertical hole is formed in the rear portion of the air exhaust plate. A cross hole is formed in the rear end of the air exhaust plate, and a front end opening of the cross hole communicates with the second vertical hole. A first oil cylinder and a second oil cylinder are arranged below the air exhaust plate side by side. A piston rod of the first oil cylinder vertically upwards stretches into the first vertical hole. A piston rod of the second oil cylinder vertically upwards stretches into the second vertical hole and is connected with a valve element. The valve element can be driven by the piston rod of the second oil cylinder to vertically move, so that a passageway between the first air exhaust channel and the cross hole is disconnected or connected. According to the device, it can be guaranteed that the cavity of the die is vacuumized in the whole filling process; the structure is simple, implementation is easy, and cost is low; the automation degree is high, and high accuracy and reliability are achieved; and no failure is generated, and the production efficiency is effectively improved.
Description
Technical field
The invention belongs to technical field of mold, specifically, control device particularly to a kind of communication type casting die vacuumizing。
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 communication type casting die vacuumizing and controls device。
Technical solution of the present invention is as follows: a kind of communication type casting die vacuumizing controls device, mould including vacuum pumping pump and belt type cavity, it is characterized in that: evacuating plate is installed on the side of described mould, offering the first bleed-off passage extended from front to back on this evacuating plate, the second bleed-off passage that the front end of described first bleed-off passage is arranged by die top connects with the die cavity of mould；
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, 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, and be connected with described vacuum pumping pump by pipeline；
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。
Adopt above technical scheme, 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。
Claims (5)
1. a communication type casting die vacuumizing controls device, mould (4) including vacuum pumping pump (3) and belt type cavity (41), it is characterized in that: evacuating plate (1) is installed on the side of described mould (4), offering the first bleed-off passage (11) extended from front to back on this evacuating plate (1), the second bleed-off passage (42) that the front end of described first bleed-off passage (11) is arranged by mould (4) top connects with the die cavity (41) of mould (4)；
The first vertical core (12) is had in the front portion of described evacuating plate (1), the upper port of this first vertical core (12) communicates with the first bleed-off passage (11), the bottom surface of the through evacuating plate of the lower port (1) of the first vertical core (12), the second vertical core (13) is had at the rear portion of described evacuating plate (1), the upper port of the second vertical core (13) connects with the rear end of described first bleed-off passage (11), the bottom surface of the through evacuating plate of the lower port (1) of the second vertical core (13), the rear end of described evacuating plate (1) has cross-drilled hole (14), the front port of this cross-drilled hole (14) and the second vertical core (13) connection, the rear end face of the through evacuating plate of the rear port (1) of cross-drilled hole (14), and be connected with described vacuum pumping pump (3) by pipeline；
The first oil cylinder (5) and the second oil cylinder (6) it is arranged side by side in the lower section of described 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), the piston rod of described first oil cylinder (5) stretches in the first vertical core (12) straight up, the piston rod of the second oil cylinder (6) stretches in the second vertical core (13) straight up, and be connected with spool (9), described spool (9) can move up and down under the drive of the second oil cylinder (6) piston rod, the path between the first bleed-off passage (11) and cross-drilled hole (14) is made to disconnect or conducting；
First bleed-off passage (11) is the groove being formed at evacuating plate (1) upper surface, and the part that this groove is positioned between the first vertical core (12) and the second vertical core (13) is snakelike or serpentine or " W " shape；
Described first vertical core (12) and the second vertical core (13) are each perpendicular to the first bleed-off passage (11), and described cross-drilled hole (14) is perpendicular to the second vertical core (13)。
2. communication type casting die vacuumizing as claimed in claim 1 controls device, it is characterized in that: the rectangular chamber of the front end dilatation (15) of described first bleed-off passage (11), this rectangular chamber (15) is connected with the die cavity (41) of mould (4) by multiple the second bleed-off passages (42) being parallel to each other。
3. the communication type casting die vacuumizing as described in as arbitrary in claim 1 or 2 controls device, it is characterized in that: described 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)。
4. communication type casting die vacuumizing as claimed in claim 3 controls device, it is characterized in that: the cylinder body of described 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。
5. communication type casting die vacuumizing as claimed in claim 3 controls device, it is characterized in that: the cylinder body of described first oil cylinder (5) and the cylinder body of the second oil cylinder (6) are Split type structure, 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)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610156042.3A CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610156042.3A CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105689678A true CN105689678A (en) | 2016-06-22 |
| CN105689678B CN105689678B (en) | 2018-12-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610156042.3A Active CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Country Status (1)
| Country | Link |
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| CN (1) | CN105689678B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108624A (en) * | 2020-08-25 | 2020-12-22 | 广东鸿图科技股份有限公司 | Vacuum casting system and using method |
| CN113290224A (en) * | 2021-05-26 | 2021-08-24 | 巢湖宜安云海科技有限公司 | Die mould double oil cylinder UNICOM formula evacuating device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152362A (en) * | 1981-03-13 | 1982-09-20 | Nissan Motor Co Ltd | Valve device for gas venting passage in die casting machine |
| JPS62151258A (en) * | 1985-12-26 | 1987-07-06 | Aisan Ind Co Ltd | Venting device for die |
| SE9704564L (en) * | 1997-12-08 | 1999-06-09 | Ulf Liljeqvist | Block with metal channels for vacuum clock |
| DE20016166U1 (en) * | 2000-09-01 | 2000-12-28 | Gauermann, Jörg, 70794 Filderstadt | Vacuum device for die casting systems |
| US6513569B1 (en) * | 2001-11-02 | 2003-02-04 | Chun Hsien Li | Vacuum valve for die casting machine |
| CN103410799A (en) * | 2013-07-26 | 2013-11-27 | 北汽福田汽车股份有限公司 | Pumping hydraulic system |
| CN204003697U (en) * | 2014-07-23 | 2014-12-10 | 中联重科股份有限公司 | Pumping hydraulic system and pumping equipment |
-
2016
- 2016-03-18 CN CN201610156042.3A patent/CN105689678B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152362A (en) * | 1981-03-13 | 1982-09-20 | Nissan Motor Co Ltd | Valve device for gas venting passage in die casting machine |
| JPS62151258A (en) * | 1985-12-26 | 1987-07-06 | Aisan Ind Co Ltd | Venting device for die |
| SE9704564L (en) * | 1997-12-08 | 1999-06-09 | Ulf Liljeqvist | Block with metal channels for vacuum clock |
| DE20016166U1 (en) * | 2000-09-01 | 2000-12-28 | Gauermann, Jörg, 70794 Filderstadt | Vacuum device for die casting systems |
| US6513569B1 (en) * | 2001-11-02 | 2003-02-04 | Chun Hsien Li | Vacuum valve for die casting machine |
| CN103410799A (en) * | 2013-07-26 | 2013-11-27 | 北汽福田汽车股份有限公司 | Pumping hydraulic system |
| CN204003697U (en) * | 2014-07-23 | 2014-12-10 | 中联重科股份有限公司 | Pumping hydraulic system and pumping equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108624A (en) * | 2020-08-25 | 2020-12-22 | 广东鸿图科技股份有限公司 | Vacuum casting system and using method |
| CN113290224A (en) * | 2021-05-26 | 2021-08-24 | 巢湖宜安云海科技有限公司 | Die mould double oil cylinder UNICOM formula evacuating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105689678B (en) | 2018-12-11 |
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Address after: 402761 A, No. 60, long Qing Road, Qinggang street, Bishan District, Chongqing. Patentee after: CHONGQING RUITONG SEIKO TECHNOLOGY CO.,LTD. Address before: No. 60, dragon green road, Qingqian street, Bishan District, Chongqing Patentee before: CHONGQING RUITONG INDUSTRIAL CO.,LTD. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Connected vacuum control device for die-casting molds Granted publication date: 20181211 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Chongqing Branch Pledgor: CHONGQING RUITONG SEIKO TECHNOLOGY CO.,LTD. Registration number: Y2024500000029 |
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