CN107931548A - A kind of ingot, silver ingot automatic production line system - Google Patents
A kind of ingot, silver ingot automatic production line system Download PDFInfo
- Publication number
- CN107931548A CN107931548A CN201810007054.9A CN201810007054A CN107931548A CN 107931548 A CN107931548 A CN 107931548A CN 201810007054 A CN201810007054 A CN 201810007054A CN 107931548 A CN107931548 A CN 107931548A
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- ingot
- guide rail
- transport trolley
- pass
- flowing water
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D9/00—Machines or plants for casting ingots
Abstract
The invention discloses a kind of ingot, silver ingot automatic production line system, along the conveying direction of assembly line includes weighing cutting agency successively, material toggling is closed lid mechanism, the first transport trolley mechanism, melting furnace main body, the second transport trolley mechanism and material fetching mechanism of uncapping, and is connected respectively with the control system signal.The present invention has the following advantages：Directional solidification technique is used, product surface is smooth, without polishing grinding；It is molded next time in inert gas shielding, phenomena such as ingot and silver ingot product are without sand holes, stomata and surface irregularity；Using the inert gas shielded melting of sealing, shaping whole process is being sealed and carried out under guard mode, without any flue gas emission；Sealed and processed using melting furnace, external skin temperatures are maintained at 35 degrees centigrades when internal temperature reaches 1450 DEG C, so without any heat radiation；Operated in whole process using mechanical automation, staff labor intensity is low.
Description
Technical field
The present invention relates to noble metal processing, and in particular to a kind of ingot, silver ingot automatic production line system.
Background technology
Uses hand teeming for ingot, silver ingot in industry at present, first by equipment such as sensing heatings by gold or
Person's silver melts, then is poured into the gold of melting or silver in metal die (in liquid) by firelock insulation, to be cooled
After take out product.This processing method has the following disadvantages：
1. the ingot come out using hand teeming, silver ingot product occur that sand holes, stomata and surface irregularity have ripples
Phenomena such as line, qualification rate are very low；
2. flue dust can be produced in process of production using hand teeming, and pollution can be produced to surrounding environment, in flue dust
The noble metals such as gold and silver can be carried secretly to be difficult to recycle, increase cost, working environment is severe；
3. in the production process of hand teeming, very high temperature is needed when smelting furnace melts gold, can be produced
Substantial amounts of heat radiation；
4. silver ingot is heavier, but needs manually to carry in current production process, staff labor intensity is very big.
Asked it can be seen from the above that current ingot silver ingot processing is there are cost of idleness, working environment is severe and labor intensity is high
Topic.
The content of the invention
The technical problems to be solved by the invention are that there are cost of idleness, working environment are severe for current ingot silver ingot processing
With labor intensity it is high the problem of.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention there is provided a kind of ingot, silver ingot entirely certainly
Dynamic line production system, includes successively along the conveying direction of assembly line：
Cutting agency is weighed, is arranged on the side of the assembly line, the assembly line is equipped with the graphite mo(u)ld of upper end opening
Tool, the cutting agency that weighs include being placed in the weigher and feed opening above the graphite jig；
Material toggling closes lid mechanism, and the side of the assembly line is equipped with flowing water by-pass, and the flowing water by-pass is equipped with graphite upper cover,
The material toggling closes lid mechanism across the assembly line and the flowing water by-pass, including material toggling piece and the first sponge sucker, described group
Tablet and the first sponge sucker can realize joint translation and independent-lifting；
First transport trolley mechanism, is arranged on the output terminal of the assembly line, including waggon and the vehicle seat equipped with rack,
The bottom of the waggon is equipped with gear, and motor drives the gear to drive the waggon rectilinear movement, first conveying
The output terminal of trolley body is equipped with oil cylinder pushing mechanism；
Melting furnace main body, it is closed inert gas environment that it is internal, equipped with more piece heating guide rail and more piece cooling guide rail；
Second transport trolley mechanism, the second transport trolley machine identical with the structure of the first transport trolley mechanism
The output terminal of structure connects with the input terminal of the assembly line；
Uncap material fetching mechanism, inhaled across the assembly line and the flowing water by-pass, including two the second sponges being arranged side by side
Disk, two second suckers can realize joint translation and independent-lifting；
It is small that weighing cutting agency, the material toggling close lid mechanism, the first transport trolley mechanism, melting furnace main body, the second conveying
Mechanism of car and the material fetching mechanism of uncapping are connected with the control system signal respectively.
In another preferred embodiment, the material toggling close lid mechanism be arranged on the flowing water by-pass output terminal it is upper
Side, the material fetching mechanism of uncapping are arranged on the top of the input terminal of the flowing water by-pass, and the material fetching mechanism of uncapping will process
Into the graphite upper cover removed from the graphite jig, then the graphite upper cover is placed on to the input of the flowing water by-pass
End, the graphite upper cover are moved to output terminal with the flowing water by-pass, and the material toggling closes lid mechanism by the graphite upper cover from institute
State and removed on flowing water by-pass, and cover on the graphite jig to be processed.
In another preferred embodiment, the material toggling piece and the first sponge sucker are jointly by transversal driving mechanism
Driving, and is slidably arranged on horizontal guide rail, and the horizontal guide rail is equipped with two upright guide rails side by side, the material toggling piece with
The first sponge sucker is driven by a upright driving mechanism respectively, and is slidably arranged in respectively on two upright guide rails.
In another preferred embodiment, the both sides of the base are equipped with guide rail, and middle part is equipped with rack, the waggon
Bottom surface be equipped with the gear that be adapted to the rack, motor drives the gear rotation, drives the waggon along the guide rail
Slide, the top surface of the waggon is equipped with cargo access way, and after completing conveying task, the control system controls the electricity
Machine inverts, and the waggon is moved backward to return.
In another preferred embodiment, the melting furnace main body includes sensing heating tunnel body and cooling tunnel body,
The heating guide rail is respectively saved to be placed in sensing heating tunnel body, and the periphery of the heating guide rail is surrounded with induction coil,
Respectively save the cooling guide rail to be placed in the cooling tunnel body, respectively save in the cooling guide rail and be equipped with cooling water channel.
In another preferred embodiment, on the output terminal of the first transport trolley mechanism, closed away from the material toggling
The side of lid mechanism is equipped with anti-falling mechanism, and the anti-falling mechanism is equipped with baffle, and the baffle and the described first conveying are small
The horizontal distance of mechanism of car is adjustable.
In another preferred embodiment, the flowing water by-pass using closure link chain mechanism, on the link chain mechanism
Equipped with multiple connecting shafts, each connecting shaft forms pipeline side by side.
In another preferred embodiment, the side wall of sensing heating tunnel body is equipped with perforate, and the sensing adds
The side of heat tunnel body is equipped with circuit box, and the cable of the circuit box is electrically connected through the perforate with the induction coil.
In another preferred embodiment, the joint number of the heating guide rail and the cooling guide rail is respectively 5 sections.
In another preferred embodiment, the assembly line, the first transport trolley mechanism, melting furnace main body and described
Two transport trolley mechanisms surround the rectangle of closure.
The present invention has the following advantages：
1. establishing the temperature gradient of specific direction, make the crystallization of molten alloy along the direction opposite with hot-fluid as requested
Orientation solidification, i.e., using directional solidification technique, product surface is smooth, without polishing grinding；
2. be molded in inert gas shielding next time, ingot and silver ingot product are existing without sand holes, stomata and surface irregularity etc.
As；
3. using the inert gas shielded melting of sealing, shaping whole process is being sealed and carried out under guard mode, and nothing is appointed
What flue gas emission；
4. using melting furnace sealing processing, when internal temperature reaches 1450 DEG C, external skin temperatures are maintained at 35 degrees Celsius of left sides
The right side, so without any heat radiation；
5. being operated in whole process using mechanical automation, staff labor intensity is low.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the structure diagram of the weighing cutting agency of the present invention；
Fig. 3 is the partial enlarged view in A portions in Fig. 2；
Fig. 4 is that the material toggling of the present invention closes the structure diagram of lid mechanism；
Fig. 5 is the structure diagram of the melting furnace main body of the present invention；
Fig. 6 is the internal structure schematic diagram of the melting furnace main body of the present invention；
Fig. 7 is the structure diagram of the material fetching mechanism of uncapping of the present invention.
Embodiment
The present invention provides a kind of ingot, silver ingot automatic production line system, with reference to specific embodiment and specification
Attached drawing is described in detail the present invention.
As shown in Figure 1, ingot provided by the invention, silver ingot automatic production line system, along the conveying direction of assembly line 70
Include weighing cutting agency 10 successively, that material toggling closes lid mechanism 20, the first transport trolley mechanism 30, melting furnace main body 50, second is defeated
Send trolley body 90 and material fetching mechanism 60 of uncapping.The particulate material weighing blanking of ingot, silver ingot to be processed enters graphite jig
80, then upper surface is stirred smooth and cover graphite jig 80, then carrying out the realization of smelting furnace main body 50 by transport adds
Heat fusing, then again by transport, and then uncaps and takes out finished product.
As shown in Fig. 2, weighing the side that cutting agency 10 is arranged on assembly line 70, assembly line 70 is equipped with upper end opening
Graphite jig 80, weighs weigher and feed opening 12 that cutting agency 10 includes being placed in the top of graphite jig 80.The title of weigher
Weight result can real-time sending control system 100, the raw material for meeting preset value is output in graphite jig 80 by feed opening 12,
The degree of automation is high, and high sensitivity is easy to operate, can monitor in real time.
As shown in figure 4, the side of assembly line 70 is equipped with flowing water by-pass 71, flowing water by-pass 71 is equipped with graphite upper cover 81, dials
Material closes lid mechanism 20 across assembly line 70 and flowing water by-pass 71, including 21 and first sponge sucker 22 of material toggling piece, 21 He of material toggling piece
First sponge sucker 22 can realize joint translation and independent-lifting.Graphite upper cover 81 is provided using flowing water by-pass 71, is being used
When, material toggling piece 21 declines, and the raw material in the graphite jig 80 on assembly line 70 is moved flat, the first general who has surrendered's stone of sponge sucker 22 times
Black upper cover 81 picks up, then by first rise afterwards translate, then graphite upper cover is placed on graphite jig 80.
First transport trolley mechanism 30 is arranged on the output terminal of assembly line 70, including waggon 31 and the car equipped with rack 32
Seat, the bottom of waggon 31 are equipped with gear, and motor-driven gear drives waggon 31 to move linearly, the first transport trolley mechanism 30
Output terminal be equipped with oil cylinder pushing mechanism 40.Waggon 31 moves on assembly line 70, and graphite jig 80 is transported to down together
Station, waggon 31 can ensure the steady of transport, and the raw material for avoiding having moved flat becomes out-of-flatness due to jolting, and influence final
Processing effect.
As shown in Figure 5 and Figure 6, the inside of melting furnace main body 50 is closed inert gas environment, equipped with more piece heating guide rail
53 and more piece cooling guide rail 54, graphite jig 80 enter after first pass through heating melting again through supercooling, melting furnace main body 50 is lazy
Work is run under property gas shield, this processing method homogeneous heating, avoids the occurrence of the quality such as sand holes, stomata and water ripples and ask
Topic.
Second transport trolley mechanism 90 is identical with the structure of the first transport trolley mechanism 30, the second transport trolley mechanism 90
Output terminal connects with the input terminal of assembly line 70.
As shown in fig. 7, material fetching mechanism 60 of uncapping is across assembly line 70 and flowing water by-pass 71, including two be arranged side by side second
Sponge sucker 61, two second suckers can realize joint translation and independent-lifting.Two the second sponge suckers 61 are used for graphite
Lid 81, finished product take out, and will not destroy internal finished product, keep shape intact.
Weigh cutting agency 10, that material toggling closes lid mechanism 20, the first transport trolley mechanism 30, melting furnace main body 50, second is defeated
Send trolley body 90 and material fetching mechanism 60 of uncapping is connected with 100 signal of control system respectively, so that each mechanism can realize
Automated control, it is only necessary to which a people operates control system 100, and each manufacturing procedure is monitored and is adjusted, and ensures
The normal operation of whole system.
As shown in figure 4, material toggling closes the top that lid mechanism 20 is arranged on the output terminal of flowing water by-pass 71, material fetching mechanism 60 of uncapping
The top of the input terminal of flowing water by-pass 71 is arranged on, material fetching mechanism 60 of uncapping is by the graphite upper cover 81 machined from graphite jig
Removed on 80, then graphite upper cover 81 is placed on to the input terminal of flowing water by-pass 71, graphite upper cover 81 is moved to flowing water by-pass 71
Output terminal, material toggling closes lid mechanism 20 and removes graphite upper cover 81 from flowing water by-pass 71, and covers in graphite jig to be processed
On 80.The graphite upper cover 81 of the finished product machined is directly used on graphite jig 80 to be processed, flowing water by-pass 71 causes
Graphite upper cover 81 can recycle.
21 and first sponge sucker 22 of material toggling piece is driven by transversal driving mechanism jointly, and is slidably arranged in horizontal guide rail
On, horizontal guide rail is equipped with two upright guide rails side by side, and 21 and first sponge sucker 22 of material toggling piece is respectively by a vertical driving
Mechanism drives, and is slidably arranged in respectively on two upright guide rails.This structure can guarantee that translation track and independent-lifting it is steady
It is fixed, convenient control.
In the first transport trolley mechanism 30, the both sides of base are equipped with guide rail 33, and middle part is equipped with rack 32, waggon 31
Bottom surface is equipped with the gear being adapted to rack 32, and motor-driven gear rotates, and drives waggon 31 to be slided along guide rail 33, waggon 31
Top surface be equipped with cargo access way 311, after completing conveying task, control system 100 controls motor reversal, makes waggon 31
Move backward to return.The movement of waggon 31, output power, and and guide rail are realized using the kind of drive of rack-and-pinion
33 1 same-actions, make 80 held stationary of graphite jig on waggon 31.
As shown in fig. 6, melting furnace main body 50 includes sensing heating tunnel body 51 and cooling tunnel body 52, heating guide rail is respectively saved
53 are placed in sensing heating tunnel body 51, and the periphery of heating guide rail 53 is surrounded with induction coil 531, and each section cooling guide rail 54 is put
In in cooling tunnel body 52, cooling water channel 541 is equipped with each section cooling guide rail 54.Electrical heating is realized using induction coil 531, it is right
Raw material in graphite jig 80 is evenly heated, while is cooled down and be also convenient for controlling using water cooling, heating duration and cooling duration
System, ensure that the stay in grade of all products.
As shown in Figure 3 and Figure 7, on the output terminal of the first transport trolley mechanism 30, the side of lid mechanism 20 is closed away from material toggling
Equipped with anti-falling mechanism 110, anti-falling mechanism 110 is equipped with baffle 111, the water of 111 and first transport trolley mechanism 30 of baffle
Put down apart from adjustable.When graphite jig 80 closes the waggon 31 in first transport trolley mechanism 30 of the entrance of lid mechanism 20 from material toggling, gear
Plate 111 can prevent graphite jig 80 from moving excessively to drop from waggon 31.
As shown in figs. 4 and 7, flowing water by-pass 71 is equipped with multiple connecting shafts using the link chain mechanism closed, link chain mechanism,
Each connecting shaft forms pipeline side by side.Since flowing water by-pass 71 is to fill the stone of raw material for graphite upper cover 81, rather than transport
Black mould 80, therefore there is no excessive demand to the steady of transport, and link chain mechanism can save equipment cost, and easy to safeguard.
As shown in fig. 6, the side wall of sensing heating tunnel body 51 is equipped with perforate, the side of sensing heating tunnel body 51 is equipped with
Circuit box 55, the cable of circuit box 55 are electrically connected through perforate with induction coil 531.The structure setting of circuit box 55 to sense
The operating parameter of heating tunnel's body 51 more quantifies, and parameters are adjustable, easy to monitor.
The joint number of heating guide rail 53 and cooling guide rail 54 is respectively 5 sections, is cooled down by stepped heating and step by step, procedure of processing
It is more controllable, help to improve the quality of finished product.
Assembly line 70, the first transport trolley mechanism 30,50 and second transport trolley mechanism 90 of melting furnace main body surround closure
Rectangle.This layout type compared with to save space, and the distance of operating personnel and each mechanism it is all roughly the same, easy to check
With timely adjustment.
The present invention has the following advantages：
1. establishing the temperature gradient of specific direction, make the crystallization of molten alloy along the direction opposite with hot-fluid as requested
Orientation solidification, i.e., using directional solidification technique, product surface is smooth, without polishing grinding；
2. be molded in inert gas shielding next time, ingot and silver ingot product are existing without sand holes, stomata and surface irregularity etc.
As；
3. using the inert gas shielded melting of sealing, shaping whole process is being sealed and carried out under guard mode, and nothing is appointed
What flue gas emission；
4. using melting furnace sealing processing, when internal temperature reaches 1450 DEG C, external skin temperatures are maintained at 35 degrees Celsius of left sides
The right side, so without any heat radiation；
5. being operated in whole process using mechanical automation, staff labor intensity is low.
The present invention is not only limited to above-mentioned preferred forms, and anyone should learn that what is obtained under the enlightenment of the present invention
Structure change, the technical schemes that are same or similar to the present invention, each fall within protection scope of the present invention.
Claims (10)
1. a kind of ingot, silver ingot automatic production line system, it is characterised in that include successively along the conveying direction of assembly line：
Cutting agency is weighed, is arranged on the side of the assembly line, the assembly line is equipped with the graphite jig of upper end opening, institute
Stating weighing cutting agency includes being placed in the weigher and feed opening above the graphite jig；
Material toggling closes lid mechanism, and the side of the assembly line is equipped with flowing water by-pass, and the flowing water by-pass is equipped with graphite upper cover, described
Material toggling closes lid mechanism across the assembly line and the flowing water by-pass, including material toggling piece and the first sponge sucker, the material toggling piece
Joint translation and independent-lifting can be realized with the first sponge sucker；
First transport trolley mechanism, is arranged on the output terminal of the assembly line, including waggon and the vehicle seat equipped with rack, described
The bottom of waggon is equipped with gear, and motor drives the gear to drive the waggon rectilinear movement, first transport trolley
The output terminal of mechanism is equipped with oil cylinder pushing mechanism；
Melting furnace main body, it is closed inert gas environment that it is internal, equipped with more piece heating guide rail and more piece cooling guide rail；
Second transport trolley mechanism, it is identical with the structure of the first transport trolley mechanism, the second transport trolley mechanism
Output terminal connects with the input terminal of the assembly line；
Uncap material fetching mechanism, across the assembly line and the flowing water by-pass, including two the second sponge suckers being arranged side by side, two
Second sucker can realize joint translation and independent-lifting；
The weighing cutting agency, material toggling close lid mechanism, the first transport trolley mechanism, melting furnace main body, the second transport trolley machine
Structure and the material fetching mechanism of uncapping are connected with the control system signal respectively.
2. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the material toggling closes lid machine
Structure is arranged on the top of the output terminal of the flowing water by-pass, and the material fetching mechanism of uncapping is arranged on the input terminal of the flowing water by-pass
Top, the material fetching mechanism of uncapping removes the graphite upper cover machined from the graphite jig, then by institute
The input terminal that graphite upper cover is placed on the flowing water by-pass is stated, the graphite upper cover is moved to output terminal with the flowing water by-pass, institute
State material toggling and close lid mechanism and remove the graphite upper cover from the flowing water by-pass, and cover in the graphite jig to be processed
On.
3. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the material toggling piece and institute
State the first sponge sucker to be driven by transversal driving mechanism jointly, and be slidably arranged on horizontal guide rail, set on the horizontal guide rail
There are two upright guide rails side by side, the material toggling piece and the first sponge sucker are driven by a upright driving mechanism respectively, and
It is slidably arranged in respectively on two upright guide rails.
4. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the both sides of the base
Equipped with guide rail, middle part is equipped with rack, and the bottom surface of the waggon is equipped with the gear being adapted to the rack, and motor drives the tooth
Wheel rotates, and drives the waggon to be slided along the guide rail, and the top surface of the waggon is equipped with cargo access way, completes defeated
After sending task, the control system controls the motor reversal, the waggon is moved backward to return.
5. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the melting furnace main body
Including sensing heating tunnel body and cooling tunnel body, respectively save the heating guide rail and be placed in sensing heating tunnel body, and institute
The periphery for stating heating guide rail is surrounded with induction coil, respectively saves the cooling guide rail and is placed in the cooling tunnel body, described in each section
Cooling water channel is equipped with cooling guide rail.
6. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that first conveying is small
On the output terminal of mechanism of car, the side that lid mechanism is closed away from the material toggling is equipped with anti-falling mechanism, is set on the anti-falling mechanism
There is baffle, the baffle and the horizontal distance of the first transport trolley mechanism are adjustable.
7. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the flowing water by-pass is adopted
With the link chain mechanism of closure, the link chain mechanism is equipped with multiple connecting shafts, and each connecting shaft forms pipeline side by side.
8. ingot according to claim 5, silver ingot automatic production line system, it is characterised in that the sensing heating tunnel
The side wall of road body is equipped with perforate, and the side of sensing heating tunnel body is equipped with circuit box, and the cable of the circuit box passes through
The perforate is electrically connected with the induction coil.
9. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the heating guide rail and
The joint number of the cooling guide rail is respectively 5 sections.
10. ingot according to claim 1, silver ingot automatic production line system, it is characterised in that the assembly line,
One transport trolley mechanism, melting furnace main body and the second transport trolley mechanism surround the rectangle of closure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810007054.9A CN107931548A (en) | 2018-01-04 | 2018-01-04 | A kind of ingot, silver ingot automatic production line system |
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| CN201810007054.9A CN107931548A (en) | 2018-01-04 | 2018-01-04 | A kind of ingot, silver ingot automatic production line system |
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Cited By (6)
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| CN108746517A (en) * | 2018-08-16 | 2018-11-06 | 深圳市金鼎丰贵金属设备科技有限公司 | A kind of vacuum continuous ingot furnace and its casting ingot process |
| CN110238373A (en) * | 2019-07-15 | 2019-09-17 | 西安汇创贵金属新材料研究院有限公司 | A kind of ingot casting system |
| CN110948365A (en) * | 2019-11-05 | 2020-04-03 | 深圳市金鼎丰贵金属设备科技有限公司 | Automatic polishing system for silver ingots |
| CN111974954A (en) * | 2020-08-20 | 2020-11-24 | 山东工业职业学院 | Ingot casting production line |
| CN113351841A (en) * | 2021-06-04 | 2021-09-07 | 江西华正智能装备有限公司 | Dual-mode alternative static anaerobic casting system |
| CN108746517B (en) * | 2018-08-16 | 2024-04-26 | 深圳市金鼎丰贵金属设备科技有限公司 | Vacuum continuous ingot furnace and ingot casting process thereof |
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| CN207941943U (en) * | 2018-01-04 | 2018-10-09 | 深圳市金鼎丰贵金属设备科技有限公司 | A kind of ingot, silver ingot automatic production line system |
Cited By (6)
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| CN108746517B (en) * | 2018-08-16 | 2024-04-26 | 深圳市金鼎丰贵金属设备科技有限公司 | Vacuum continuous ingot furnace and ingot casting process thereof |
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