CN215237605U - Liquid material adding device and 3D printer - Google Patents
Liquid material adding device and 3D printer Download PDFInfo
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- CN215237605U CN215237605U CN202120387662.4U CN202120387662U CN215237605U CN 215237605 U CN215237605 U CN 215237605U CN 202120387662 U CN202120387662 U CN 202120387662U CN 215237605 U CN215237605 U CN 215237605U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The utility model relates to a liquid material adds device and 3D printer. The 3D printer includes the liquid material adds the device, the liquid material adds the device and includes: the main liquid piston mechanism and the auxiliary liquid piston mechanism; the main liquid piston mechanism comprises a main liquid piston cylinder, a main liquid piston rod and a main driving piece, wherein the main liquid piston cylinder is provided with a liquid inlet valve and a liquid outlet valve, the main liquid piston rod is movably contained in the main liquid piston cylinder, the main liquid piston rod is provided with a containing cavity, and the main driving piece is in driving connection with the main liquid piston rod; the auxiliary liquid piston mechanism comprises an auxiliary liquid piston rod and an auxiliary driving piece, the auxiliary liquid piston rod is movably contained in the containing cavity of the main liquid piston rod, and the auxiliary driving piece is in driving connection with the auxiliary liquid piston rod. Liquid material adds device and 3D printer can realize that liquid material single adds the volume big and can satisfy higher measurement accuracy.
Description
Technical Field
The utility model relates to a 3D prints technical field, especially relates to a liquid material adds device and 3D printer.
Background
In the sand mold 3D printing technology, in the sand mold printing and forming process, whether sand and liquid material are accurately proportioned or not directly influences the quality of a sand mold, and the accurate addition of the liquid material during sand mixing provides guarantee for the set mixing proportion. At present, the liquid material adding device usually adopts a cylinder and needle cylinder matching mode to carry out liquid material counting, and the mode can meet certain precision requirements when the adding amount is small, but when the single sand mixing amount is large, the needle cylinder is required to add the liquid material for multiple times, so that accumulated errors can be caused, and on the other hand, the fault rate is increased due to frequent action of the adding device, and the service life of the adding device is shortened. In this respect, the reduction of the number of additions of liquid material, which is a measure generally envisaged by the skilled person, is the increase of the cross-sectional area of the barrel, which reduces the metering accuracy, or the lengthening of the barrel, which only increases the volume of the barrel to a lesser extent due to the limitation of the stroke of the piston of the barrel and the installation space. Therefore, both of the two methods cannot solve the effective solution of the liquid adding problem of the current 3D printing device.
SUMMERY OF THE UTILITY MODEL
On the basis, it is necessary to provide a liquid material adding device and a 3D printer which can realize that the single addition of liquid material is large and can satisfy higher metering accuracy, aiming at the problems that the precision of the liquid material adding device of the 3D printer in the prior art is difficult to control in the liquid material adding process and the failure rate is higher due to frequent feeding.
A liquid material adding device comprises: the main liquid piston mechanism and the auxiliary liquid piston mechanism; the main liquid piston mechanism comprises a main liquid piston cylinder, a main liquid piston rod and a main driving piece, wherein the main liquid piston cylinder is provided with a liquid inlet valve and a liquid outlet valve, the main liquid piston rod is movably contained in the main liquid piston cylinder, the main liquid piston rod is provided with a containing cavity, and the main driving piece is in driving connection with the main liquid piston rod and is used for controlling the main liquid piston rod to move up and down along the main liquid piston cylinder to suck liquid; the auxiliary liquid piston mechanism comprises an auxiliary liquid piston rod and an auxiliary driving piece, the auxiliary liquid piston rod is movably contained in the containing cavity of the main liquid piston rod, and the auxiliary driving piece is in driving connection with the auxiliary liquid piston rod and used for controlling the auxiliary liquid piston rod to move up and down along the containing cavity of the main liquid piston rod to suck liquid.
In one embodiment, the primary liquid piston mechanism further comprises a primary liquid cartridge piston rod seat, the primary liquid piston rod being connected to the primary drive member through the primary liquid cartridge piston rod seat.
In one embodiment, the secondary hydraulic piston mechanism further comprises a secondary cartridge piston rod seat, the secondary cartridge piston rod being connected to the secondary drive member through the secondary cartridge piston rod seat.
In one embodiment, the secondary liquid piston mechanism further comprises a secondary driving member mounting seat, and the secondary driving member is connected with the upper end of the primary liquid piston rod through the secondary driving member mounting seat.
In one embodiment, the secondary drive mount is fixedly connected to the primary liquid cartridge piston rod mount.
In one embodiment, the liquid material adding device further comprises an installation frame, and the main liquid material piston cylinder and the main driving part are respectively fixed on the installation frame.
In one embodiment, the main liquid piston cylinder is fixedly connected with the mounting frame through a main liquid piston cylinder fixing seat.
In one embodiment, the main driving member is fixedly connected with the mounting frame through a main driving member mounting seat.
In one embodiment, the liquid inlet valve and the liquid outlet valve are both one-way automatic valves.
A3D printer, the 3D printer includes the liquid material interpolation device of any embodiment.
Above-mentioned liquid material adds device and installs liquid material adds device's 3D printer is provided with the holding chamber through the main liquid material piston rod with main liquid material piston cylinder, forms the periphery and has the piston cylinder of great bore and the inside little piston cylinder that has less bore, and the two can realize independent motion and do not interfere each other. The main liquid material piston cylinder is driven by the main driving part, quantitative suction and extrusion of most liquid materials required by proportioning are achieved, the auxiliary liquid material piston rod is driven by the auxiliary driving part, accurate suction and extrusion of residual liquid materials required by proportioning are achieved, and accordingly the liquid material adding device is large in single-time adding amount and can meet the requirement of high metering accuracy.
Drawings
FIG. 1 is a schematic structural diagram of a main body of a liquid material feeding apparatus according to an embodiment;
fig. 2 is a schematic view of the entire mechanism of a liquid material adding apparatus according to another embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment, a liquid adding apparatus comprises: the main liquid piston mechanism and the auxiliary liquid piston mechanism; the main liquid piston mechanism comprises a main liquid piston cylinder, a main liquid piston rod and a main driving piece, wherein the main liquid piston cylinder is provided with a liquid inlet valve and a liquid outlet valve, the main liquid piston rod is movably contained in the main liquid piston cylinder, the main liquid piston rod is provided with a containing cavity, and the main driving piece is in driving connection with the main liquid piston rod and is used for controlling the main liquid piston rod to move up and down along the main liquid piston cylinder to suck liquid; the auxiliary liquid piston mechanism comprises an auxiliary liquid piston rod and an auxiliary driving piece, the auxiliary liquid piston rod is movably contained in the containing cavity of the main liquid piston rod, and the auxiliary driving piece is in driving connection with the auxiliary liquid piston rod and used for controlling the auxiliary liquid piston rod to move up and down along the containing cavity of the main liquid piston rod to suck liquid.
In another embodiment, a 3D printer includes a liquid adding device, the liquid adding device includes: the main liquid piston mechanism and the auxiliary liquid piston mechanism; the main liquid piston mechanism comprises a main liquid piston cylinder, a main liquid piston rod and a main driving piece, wherein the main liquid piston cylinder is provided with a liquid inlet valve and a liquid outlet valve, the main liquid piston rod is movably contained in the main liquid piston cylinder, the main liquid piston rod is provided with a containing cavity, and the main driving piece is in driving connection with the main liquid piston rod and is used for controlling the main liquid piston rod to move up and down along the main liquid piston cylinder to suck liquid; the auxiliary liquid piston mechanism comprises an auxiliary liquid piston rod and an auxiliary driving piece, the auxiliary liquid piston rod is movably contained in the containing cavity of the main liquid piston rod, and the auxiliary driving piece is in driving connection with the auxiliary liquid piston rod and used for controlling the auxiliary liquid piston rod to move up and down along the containing cavity of the main liquid piston rod to suck liquid.
Above-mentioned liquid material adds device and installs liquid material adds device's 3D printer is provided with the holding chamber through the main liquid material piston rod with main liquid material piston cylinder, forms the periphery and has the piston cylinder of great bore and the inside little piston cylinder that has less bore, and the two can realize independent motion and do not interfere each other. The main liquid material piston cylinder is driven by the main driving part, quantitative suction and extrusion of most liquid materials required by proportioning are achieved, the auxiliary liquid material piston rod is driven by the auxiliary driving part, accurate suction and extrusion of residual liquid materials required by proportioning are achieved, and accordingly the liquid material adding device is large in single-time adding amount and can meet the requirement of high metering accuracy.
The liquid adding device is described below with reference to specific examples to further understand the concept of the liquid adding device. Referring to fig. 1 and 2, a liquid material feeding apparatus 10 includes: the main liquid material piston mechanism 100 and the auxiliary liquid material piston mechanism 200 are connected with each other, wherein the main liquid material piston mechanism 100 is used for achieving quantitative suction and extrusion of most of liquid materials required by proportioning, and the auxiliary liquid material piston mechanism 200 is used for achieving accurate suction and extrusion of residual liquid materials required by proportioning. Therefore, the liquid material adding device can realize large single-time adding amount of the liquid material and can meet higher metering precision requirements.
Specifically, the main liquid piston mechanism 100 includes a main liquid piston cylinder 110, a main liquid piston rod 120 and a main driving member 130, the main liquid piston cylinder 110 is provided with a liquid inlet valve 111 and a liquid outlet valve 112, the main liquid piston rod 120 is movably accommodated in the main liquid piston cylinder 110, the main liquid piston rod 120 has an accommodating cavity, and the main driving member 130 is connected to the main liquid piston rod 120 in a driving manner and is used for controlling the main liquid piston rod 120 to move up and down along the main liquid piston cylinder 110 to suck liquid. In one embodiment, the liquid inlet valve 111 and the liquid outlet valve 112 are both one-way automatic valves. Through setting up one-way solenoid valve respectively, make things convenient for control system control two valves to start respectively and carry out the ration of liquid material and add and extrude, avoid the valve trouble to arouse reinforced error. Further, the liquid inlet valve 111 and the liquid outlet valve 112 are both installed at the bottom of the main liquid piston cylinder 110. Thus, the liquid material can be conveniently controlled to enter and exit. Further, the main drive 130 is an electric servo cylinder. It should be noted that the main liquid piston cylinder 110 has a larger volume, which facilitates a larger single-time feeding amount to avoid an increased failure rate of the liquid feeding device due to frequent actions.
Specifically, the secondary liquid piston mechanism 200 includes a secondary liquid piston rod 210 and a secondary driving member 220, the secondary liquid piston rod 210 is movably accommodated in the accommodating cavity of the primary liquid piston rod 120, and the secondary driving member 220 is in driving connection with the secondary liquid piston rod 210 and is configured to control the secondary liquid piston rod 210 to move up and down along the accommodating cavity of the primary liquid piston rod 120 to pump the liquid. That is, the accommodating cavity of the main liquid piston rod 120 accommodates the auxiliary liquid piston rod 210, and the main liquid piston rod 120 corresponds to an auxiliary liquid piston cylinder. That is, the piston rod of the main liquid piston cylinder is made into a small piston cylinder with a smaller diameter, and the main liquid piston cylinder 110 is a large piston cylinder with a larger diameter, which can move independently from the small piston cylinder inside, without interference. In one embodiment, the secondary drive 220 is an electric servo cylinder. That is, the piston of the small piston cylinder and the piston of the large piston cylinder are both driven by the electric servo cylinder, wherein the piston of the small piston cylinder is driven by the sub-driving member 220 to suck and extrude a small amount of liquid material, and the large piston cylinder is driven by the main driving member 130 to suck and extrude a large amount of liquid material. Because the positioning precision of the electric servo cylinder is higher, the metering precision of the liquid material is higher when the cross section area of the piston cylinder is smaller, and therefore the quantitative supply of the liquid material is realized through the two independent main liquid material piston mechanisms 100 and the auxiliary liquid material piston mechanisms 200 which do not need dosage structures.
In one embodiment, the liquid material feeding device works as follows:
when extruding the liquid material, the primary driving member 130 pushes the piston of the primary liquid material piston rod 120 of the primary liquid material piston cylinder 110 to move and extrude most of the liquid material required for proportioning, and then the secondary driving member 220 pushes the piston of the secondary liquid material piston rod 210 to move along the accommodating cavity of the primary liquid material piston rod 120 (secondary liquid material piston cylinder) and extrude the remaining liquid material required for proportioning. The adding amount of the liquid material is integrally ensured through the main liquid material piston cylinder, and the adding precision of the liquid material is ensured through the main liquid material piston rod 120.
When the amount of the remaining liquid in the main liquid piston cylinder 110 is small, the liquid needs to be added, and when the liquid is added, the main driving element 130 retracts first, so as to drive the piston in the main liquid piston cylinder 110 to move, so as to suck the liquid to the full position of the main liquid piston cylinder, and then the auxiliary driving element 220 drives the piston of the auxiliary liquid piston rod 210 to suck the liquid along the containing cavity of the main liquid piston rod 120, so as to the full position of the containing cavity of the main liquid piston rod 120.
In one embodiment, the primary liquid piston mechanism 100 further includes a primary liquid cartridge piston rod holder 140, and the primary liquid piston rod 120 is coupled to the primary drive member 130 through the primary liquid cartridge piston rod holder 140. Specifically, the main liquid cartridge piston rod holder 140 is mounted to an end of the main liquid piston rod 120 distal from the main liquid cartridge piston 110; the link of the primary drive 130 has one end connected to the primary cartridge piston rod mount 140 and the other end connected to the cylinder of the primary drive 130. Thus, when the main driving member 130 is started to extrude the material, the connecting rod is driven to move towards the direction of the main liquid cylinder piston cylinder, and the main liquid cylinder piston rod seat 140 and the main liquid cylinder piston rod 120 both move downwards, so that the liquid material in the main liquid cylinder piston cylinder is compressed, and a large amount of liquid material is smoothly extruded from the discharge valve; conversely, when the main drive 130 is activated to draw, the drive link moves in the direction of the main drive, and the main cartridge piston rod seat 140 and the main liquid piston rod 120 both move upward, drawing a large volume of liquid into the main cartridge piston cylinder through the inlet valve.
In one embodiment, the secondary fluid piston mechanism 200 further includes a secondary fluid cartridge piston rod mount 230, and the secondary fluid cartridge piston rod 210 is connected to the secondary drive member 220 through the secondary fluid cartridge piston rod mount 230. Specifically, the secondary liquid cylinder piston rod seat 230 is installed at one end of the secondary liquid piston rod 210 far from the main liquid piston rod 120; one end of the connecting rod of the sub-driving member 220 is connected to the sub-cartridge piston rod holder 230, and the other end is connected to the cylinder of the sub-driving member 220. Thus, when the auxiliary driving member 220 is started to extrude the material, the connecting rod is driven to move towards the direction of the piston rod of the main liquid material barrel, the piston rod seat 230 of the auxiliary liquid material barrel and the piston rod 210 of the auxiliary liquid material barrel both move downwards, so that the liquid material in the containing cavity of the piston rod of the main liquid material barrel is compressed, and the liquid material is more accurately extruded from the discharge valve; on the contrary, when the auxiliary driving member 130 is started to suck the liquid, the driving rod moves towards the direction of the auxiliary driving member, and the auxiliary liquid cylinder piston rod seat 230 and the auxiliary liquid cylinder piston rod 210 both move upwards, so that the liquid material is accurately sucked into the main liquid cylinder piston cylinder and the accommodating cavity of the main liquid cylinder piston rod in a small amount through the liquid inlet valve.
In one embodiment, the secondary hydraulic piston mechanism further includes a secondary driver mounting seat 240, and the secondary driver 220 is connected to the upper end of the primary hydraulic piston rod 120 through the secondary driver mounting seat 240. Further, the secondary drive mount 240 is fixedly attached to the primary liquid cartridge piston rod mount 140. That is, the secondary driver mount 240 and the primary cartridge piston rod holder 140 are structural bodies that are connected to each other. In one embodiment, the secondary drive mount 240 is integrally connected to the primary liquid cartridge piston rod mount 140. This ensures the stability of the overall structure. It should be noted that the secondary liquid piston rod 210 is connected to the primary liquid cartridge piston rod holder 140 without contact, which prevents the primary liquid piston mechanism and the secondary liquid piston mechanism from moving relative to each other.
In an embodiment, the liquid adding apparatus further includes a mounting bracket 300, and the main liquid piston cylinder 110 and the main driving member 130 are respectively fixed to the mounting bracket 300. In one embodiment, the main plunger cylinder 110 is fixedly attached to the mounting bracket 300 by a main plunger cylinder holder 150. In one embodiment, the primary drive member 130 is fixedly coupled to the mounting bracket 300 via a primary drive member mounting base 160. In a preferred embodiment, the mounting frame 300 is a supporting mounting plate, which facilitates mounting the integral liquid adding device on the main machine of the equipment through the mounting frame 300. In a preferred embodiment, the main hydraulic cylinder holder 150 and the main drive member holder 160 are fixed blocks. Further, the fixing block is detachably mounted on the mounting frame 300 and/or the main liquid piston cylinder 110 and the main driving member 130. That is, the mounting frame 300 is detachably mounted to the main liquid piston cylinder 110 and the main driving member 130, so that the liquid adding apparatus can be easily mounted or dismounted integrally.
According to the liquid material adding device, the main liquid material piston rod of the main liquid material piston cylinder is provided with the containing cavity, the piston cylinder with the larger caliber at the periphery and the small piston cylinder with the smaller caliber at the inside are formed, and the two can realize independent movement without mutual interference. The main liquid material piston cylinder is driven by the main driving part, quantitative suction and extrusion of most liquid materials required by proportioning are achieved, the auxiliary liquid material piston rod is driven by the auxiliary driving part, accurate suction and extrusion of residual liquid materials required by proportioning are achieved, and accordingly the liquid material adding device is large in single-time adding amount and can meet the requirement of high metering accuracy.
In an embodiment, a 3D printer includes the liquid feeding device 10 according to any one of the above embodiments.
Above-mentioned 3D printer adds the device through setting up the liquid material on the 3D printer, is provided with the holding chamber through the main liquid material piston rod with main liquid material piston cylinder, forms the periphery and has the piston cylinder of great bore and the inside little piston cylinder that has less bore, and the two can realize independent motion and do not interfere each other. The main liquid material piston cylinder is driven by the main driving part, quantitative suction and extrusion of most liquid materials required by proportioning are achieved, the auxiliary liquid material piston rod is driven by the auxiliary driving part, accurate suction and extrusion of residual liquid materials required by proportioning are achieved, and accordingly the liquid material adding device is large in single-time adding amount and can meet the requirement of high metering accuracy.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The liquid adding device is characterized by comprising: the main liquid piston mechanism and the auxiliary liquid piston mechanism;
the main liquid piston mechanism comprises a main liquid piston cylinder, a main liquid piston rod and a main driving piece, wherein the main liquid piston cylinder is provided with a liquid inlet valve and a liquid outlet valve, the main liquid piston rod is movably contained in the main liquid piston cylinder, the main liquid piston rod is provided with a containing cavity, and the main driving piece is in driving connection with the main liquid piston rod and is used for controlling the main liquid piston rod to move up and down along the main liquid piston cylinder to suck liquid;
the auxiliary liquid piston mechanism comprises an auxiliary liquid piston rod and an auxiliary driving piece, the auxiliary liquid piston rod is movably contained in the containing cavity of the main liquid piston rod, and the auxiliary driving piece is in driving connection with the auxiliary liquid piston rod and used for controlling the auxiliary liquid piston rod to move up and down along the containing cavity of the main liquid piston rod to suck liquid.
2. The liquid adding apparatus of claim 1, wherein the primary liquid piston mechanism further comprises a primary liquid cartridge piston rod seat, the primary liquid piston rod being connected to the primary drive member through the primary liquid cartridge piston rod seat.
3. The fluid adding apparatus according to claim 2, wherein said secondary fluid piston mechanism further comprises a secondary fluid cartridge piston rod seat, said secondary fluid cartridge piston rod being connected to said secondary drive member through said secondary fluid cartridge piston rod seat.
4. The liquid adding device of claim 3, wherein the secondary liquid piston mechanism further comprises a secondary driving member mounting seat, and the secondary driving member is connected with the upper end of the main liquid piston rod through the secondary driving member mounting seat.
5. The liquid adding apparatus of claim 4, wherein the secondary drive member mounting seat is fixedly connected to the primary liquid cartridge piston rod seat.
6. The liquid adding device according to claim 1, further comprising a mounting frame, wherein the main liquid piston cylinder and the main driving member are respectively fixed to the mounting frame.
7. The liquid adding device of claim 6, wherein the main liquid piston cylinder is fixedly connected with the mounting frame through a main liquid piston cylinder fixing seat.
8. The liquid adding device as claimed in claim 6, wherein the main driving member is fixedly connected to the mounting frame through a main driving member mounting seat.
9. The liquid adding device of claim 1, wherein the liquid inlet valve and the liquid outlet valve are both one-way automatic valves.
10. A 3D printer, characterized in that the 3D printer comprises a liquid feed device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120387662.4U CN215237605U (en) | 2021-02-23 | 2021-02-23 | Liquid material adding device and 3D printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120387662.4U CN215237605U (en) | 2021-02-23 | 2021-02-23 | Liquid material adding device and 3D printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215237605U true CN215237605U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120387662.4U Active CN215237605U (en) | 2021-02-23 | 2021-02-23 | Liquid material adding device and 3D printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215237605U (en) |
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2021
- 2021-02-23 CN CN202120387662.4U patent/CN215237605U/en active Active
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Effective date of registration: 20220330 Address after: 298, ningshuo South Street, Yinchuan economic and Technological Development Zone, Ningxia Hui Autonomous Region Patentee after: KOCEL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: 750021 building 4, Yinchuan science and technology building, Liupanshan Road, Jinfeng District, Yinchuan City, Yinchuan City, Ningxia Hui Autonomous Region, national intelligent casting industry innovation center Patentee before: NATIONAL INTELLIGENT FOUNDRY INDUSTRY INNOVATION CENTER |
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