CN214517476U - Powder spraying device for improving ingot casting defects and ingot casting equipment - Google Patents
Powder spraying device for improving ingot casting defects and ingot casting equipment Download PDFInfo
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Abstract
The utility model discloses a powder spraying device for improving ingot defects, which relates to the technical field of casting, and comprises a powder adding device, a pneumatic conveying pipeline and a gas source device, wherein the output end of the gas source device and the output end of the powder adding device are both communicated with the input end of the pneumatic conveying pipeline, the output end of the pneumatic conveying pipeline is used for being arranged in molten steel in a steel ingot mold, and the powder adding device can add inorganic heat absorption powder into the pneumatic conveying pipeline; the utility model also discloses an ingot casting equipment, ingot casting equipment include foretell powder spraying device and the ingot mould that improves the ingot casting defect, in the molten steel in the ingot mould was arranged in to pneumatic conveying pipeline's output, can improve inorganic heat absorbing material and add the success rate, and be convenient for inorganic heat absorbing material transportation.
Description
Technical Field
The utility model relates to a casting technical field especially relates to an improve powder spray device and ingot casting equipment of ingot casting defect.
Background
With the rapid development of modern industrial technology, the development trend of modern cast forging production is large-scale and high-quality. However, the existing manufacturing technology of large-scale cast ingots in China has many problems, which directly restricts the development of the industry of large-scale casting and forging in China.
The large ingot has large size, the diameter and the height of the large ingot usually reach several meters, the solidification speed of the ingot is slow, a large amount of solute is separated out before solidification, and the liquid rich in the solute flows under the action of gravity and natural convection, so that the macrosegregation of the ingot is formed. In addition, the large cast ingot has the defects of inclusions, loose shrinkage cavity and the like. In the subsequent processing process, the defects of macrosegregation, inclusion and the like are difficult to eliminate, the service performance of the product is reduced, and even the product is directly scrapped. Therefore, how to solve the defects in the solidification process of the large cast ingot becomes a problem to be solved urgently in the current forge piece industry.
In order to solve the above problems, researchers have proposed various technical means for improving the solidification structure of large ingots. For example: the method comprises a multi-inclusion casting technology, a vacuum carbon deoxidation technology, an electroslag remelting technology, a layered solidification technology, a hollow ingot casting technology and the like. These techniques improve the defects of large ingots to some extent, but also have certain limitations. For example, in the electroslag remelting technology, ingot with uniform components and excellent structure can be obtained by purifying and removing impurities from slag, but the ingot has the defects of high energy consumption, serious pollution and the like.
Patent application No. 201910769072.5 shows that applying inorganic heat absorbing rod to molten steel can lower its overheat degree, improve solidification structure and raise product quality. However, the inorganic material heat absorption rod is difficult to transport, and the melting time is difficult to accurately control due to the influence of process parameters such as casting temperature, mold filling time and the like and other factors. The patent (application No. 201911126828.0) indicates that the wire feeding technique is easy to cause the problems of wire blocking and wire breaking, resulting in the failure of adding the inorganic heat-absorbing material.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an improve powder injection unit and ingot casting equipment of ingot casting defect to solve the problem that above-mentioned prior art exists, can improve inorganic heat absorbing material and add the success rate, and be convenient for inorganic heat absorbing material transportation.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides an improve powder injection apparatus of ingot casting defect, including powder feeding device, pneumatic conveyor pipe way and air supply equipment, air supply equipment's output with powder feeding device's output all with pneumatic conveyor pipe way's input intercommunication, pneumatic conveyor pipe way's output is used for arranging in the molten steel in the steel ingot mould, powder feeding device can to add inorganic heat absorption powder in the pneumatic conveyor pipe.
Preferably, the powder spraying device further comprises a lifting device, a lifting end of the lifting device is fixedly connected with the output end of the pneumatic conveying pipeline, and the lifting device can change the height position of the output end in the powder spraying process of the output end.
Preferably, the powder adding device comprises a powder spraying tank and a fluidizing device, the lower part of the powder spraying tank is communicated with the fluidizing device, the fluidizing device and the upper part of the powder spraying tank are communicated with an output port of the gas source equipment, an output pipe of the fluidizing device is communicated with the pneumatic conveying pipeline, the fluidizing device is used for fluidizing inorganic heat-absorbing powder in the powder spraying tank, and gas input into the powder spraying tank by the gas source equipment can keep that the gas pressure in the powder spraying tank is not less than the pressure in the pneumatic conveying pipeline.
Preferably, the powder adding device further comprises a bin, and an outlet pipe of the bin is communicated with the upper part of the powder spraying tank.
Preferably, the pneumatic conveying pipeline comprises a conveying pipe and a nozzle, one end of the conveying pipe is communicated with the powder adding device and the air source equipment, the other end of the conveying pipe is communicated with the nozzle, and the nozzle is used for being placed in the steel ingot mold.
Preferably, the spray head comprises a flow guide pipe and a nozzle, one end of the flow guide pipe is communicated with the conveying pipe, the other end of the flow guide pipe is communicated with the nozzle, and a fire-resistant layer is fixedly wrapped on the outer side surface of the flow guide pipe and the outer side surface of the nozzle.
Preferably, the draft tube is a steel tube, and the refractory layer is made of magnesia carbon refractory material or corundum.
Preferably, the outlet pipe of the storage bin is provided with a feed valve, and the output pipe of the fluidizing device is provided with a discharge valve.
Preferably, a pressure gauge and a flow gauge are arranged on a communicating pipeline between the powder spraying tank and the gas source equipment, a communicating pipeline between the fluidizing device and the gas source equipment and a pipeline between the conveying pipe and the gas source equipment.
The utility model also provides an ingot casting equipment, include as above powder spraying device and ingot mould of improvement ingot casting defect, pneumatic conveying pipeline's output is arranged in the molten steel in the ingot mould.
The utility model discloses for prior art gain following technological effect:
the powder spraying device for improving the ingot casting defects and the ingot casting equipment adopt the powdery inorganic heat-absorbing material as the coolant, thereby being convenient for transportation; the powder adding device, the pneumatic conveying pipeline and the air source equipment are also adopted to introduce the powder of the inorganic heat-absorbing material into the molten steel through the gas, and the gas introduced into the molten steel can make the molten steel roll and flow in the ascending process, so that the mixing speed and uniformity of the powder of the inorganic heat-absorbing material and the molten steel are increased, the superheat degree in the molten steel is effectively reduced, the success rate of adding the inorganic heat-absorbing material can be improved, the solidification structure and macro segregation of the cast ingot can be effectively improved, and the quality of the cast ingot is improved; meanwhile, the gas introduced into the molten steel and the heat-absorbed inorganic material can absorb impurities in the molten steel in the process of floating upwards, purify the molten steel and further improve the quality of cast ingots.
Furthermore, the lifting device can change the height position of the output end of the pneumatic conveying pipeline in the powder spraying process, so that the mixing uniformity of the inorganic heat-absorbing material and the molten steel is improved, and the ingot casting quality is further improved.
Furthermore, the powder spraying tank and the fluidizing device can fluidize the inorganic heat-absorbing material before the inorganic heat-absorbing material enters the pneumatic conveying pipeline, so that the loss of the inorganic heat-absorbing material in the pneumatic conveying pipeline can be reduced, the adding uniformity of inorganic heat-absorbing material powder is improved, and the ingot casting quality is further improved.
Furthermore, the storage bin is convenient for adding inorganic heat-absorbing material powder into the powder spraying tank.
Furthermore, the arrangement of the spray head can improve the spraying uniformity of the inorganic heat-absorbing material powder, and further improve the quality of cast ingots.
Furthermore, the spray head comprises a flow guide pipe and a spray nozzle, so that the structure is simple and the assembly is convenient; the honeycomb duct can be protected in the setting of flame retardant coating.
Furthermore, the flow guide pipe is a steel pipe, so that the price is low and the purchase is easy; the refractory layer is made of magnesia carbon refractory material or corundum, and has good refractory performance and long service life.
Furthermore, the arrangement of a feed valve and a discharge valve is convenient for feeding and discharging operations.
Furthermore, the arrangement of the pressure gauge and the flow meter is convenient for observing and adjusting the pressure and the air input speed in the powder spraying tank, the fluidizing device and the pneumatic conveying pipeline.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a powder spraying device for improving ingot defects provided in the first embodiment;
fig. 2 is a schematic structural diagram of a nozzle in the powder spraying device for improving ingot defects provided in the first embodiment;
in the figure: 100-powder injection device for improving ingot defects, 1-powder injection device, 2-pneumatic conveying pipeline, 3-air source equipment, 4-ingot mold, 5-lifting device, 6-powder injection tank, 7-fluidizing device, 8-bunker, 9-conveying pipe, 10-spray head, 11-guide pipe, 12-spray nozzle, 13-fire-resistant layer, 14-feed valve, 15-discharge valve, 16-pressure gauge, 17-flow meter and 18-bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing an improve powder injection unit and ingot casting equipment of ingot casting defect to solve the problem that prior art exists, can improve inorganic heat absorbing material and add the success rate, and be convenient for inorganic heat absorbing material transports.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
The embodiment provides a powder spraying device 100 for improving ingot defects, as shown in fig. 1-2, in the embodiment, the powder spraying device 100 for improving ingot defects comprises a powder adding device 1, a pneumatic conveying pipe 2 and a pneumatic source device 3, an output end of the pneumatic source device 3 and an output end of the powder adding device 1 are both communicated with an input end of the pneumatic conveying pipe 2, an output end of the pneumatic conveying pipe 2 is used for being arranged in molten steel in an ingot mold 4, the powder adding device 1 can add inorganic heat absorption powder into the pneumatic conveying pipe 9, and the inorganic heat absorption powder can be Na2O or CaO and CaF2The mixture of (2) is communicated with the pneumatic conveying pipeThe gas can adopt argon, and powdery inorganic heat-absorbing material is adopted as a coolant, so that the transportation is convenient; the powder adding device 1, the pneumatic conveying pipe 2 and the gas source equipment 3 are also adopted to introduce inorganic heat-absorbing material powder into the molten steel through gas, and the gas introduced into the molten steel can make the molten steel roll and flow in the ascending process, so that the mixing speed and uniformity of the inorganic heat-absorbing material powder and the molten steel are increased, the superheat degree in the molten steel is effectively reduced, the inorganic heat-absorbing material addition success rate can be improved, the solidification group phase and macro segregation of the cast ingot can be effectively improved, and the cast ingot quality is improved; meanwhile, the gas introduced into the molten steel and the heat-absorbed inorganic material can absorb impurities in the molten steel in the process of floating upwards, purify the molten steel and further improve the quality of cast ingots.
The powder spraying device 100 for improving the defects of the cast ingots further comprises a lifting device 5, the lifting end of the lifting device 5 is fixedly connected with the output end of the pneumatic conveying pipe 2, the lifting device 5 can change the height position of the output end in the powder spraying process of the output end, the height position of the output end of the pneumatic conveying pipe 2 can be changed in the powder spraying process, the mixing uniformity of inorganic heat-absorbing materials and molten steel is improved, and the quality of the cast ingots is further improved.
The powder adding device 1 comprises a powder spraying tank 6 and a fluidizing device 7, the lower part of the powder spraying tank 6 is communicated with the fluidizing device 7, the upper parts of the fluidizing device 7 and the powder spraying tank 6 are communicated with an output port of the air source device 3, an output pipe of the fluidizing device 7 is communicated with the pneumatic conveying pipe 2, the fluidizing device 7 is used for fluidizing inorganic heat-absorbing powder in the powder spraying tank 6, the air pressure in the powder spraying tank 6, which is input into the air source device 3, can be kept to be not less than the pressure in the pneumatic conveying pipe 2, the arrangement of the powder spraying tank 6 and the fluidizing device 7 can fluidize the inorganic heat-absorbing material before the inorganic heat-absorbing material enters the pneumatic conveying pipe 2, the loss amount of the inorganic heat-absorbing material in the pneumatic conveying pipe 2 can be reduced, the adding uniformity of the inorganic heat-absorbing material powder is improved, and the ingot casting quality is further improved.
The powder adding device 1 further comprises a storage bin 8, an outlet pipe of the storage bin 8 is communicated with the upper portion of the powder spraying tank 6, and inorganic heat-absorbing material powder is conveniently added into the powder spraying tank 6.
The pneumatic conveying pipe 2 comprises a conveying pipe 9 and a spray head 10, one end of the conveying pipe 9 is communicated with the powder adding device 1 and the air source equipment 3, the other end of the conveying pipe 9 is communicated with the spray head 10, and the spray head 10 is arranged in the ingot mould 4, so that the spraying uniformity of inorganic heat-absorbing material powder can be improved, and the ingot casting quality is further improved.
The shower nozzle 10 includes honeycomb duct 11 and nozzle 12, simple structure, and the equipment of being convenient for, honeycomb duct 11's one end and conveyer pipe 9 intercommunication, honeycomb duct 11's the other end and nozzle 12 intercommunication, fixed cladding has flame retardant coating 13 on honeycomb duct 11 and nozzle 12's the lateral surface, can protect honeycomb duct 11.
The honeycomb duct 11 is a steel pipe, and the refractory layer 13 is made of magnesia carbon refractory material or corundum, so that the refractory performance is good, and the service life is long; the fire-resistant layer can also be formed by pouring pure calcium aluminate cement and corundum, and Al is adopted2O3More than 97 percent, and the main component is alpha-Al2O3The binder of the fused corundum sand is pure calcium aluminate cement, and a stainless steel fiber reinforcing agent is added, so that the thermal shock stability and the washability of the spray head 10 can be improved, and the fire-resistant layer 13 can be fixed on the flow guide pipe 11 through the nozzle 12 and the bolt 18.
The outlet pipe of the storage bin 8 is provided with a feed valve 14, and the output pipe of the fluidizing device 7 is provided with a discharge valve 15, so that the feeding and discharging operations are facilitated.
The pressure gauge 16 and the flow meter 17 are arranged on the communicating pipeline of the powder spraying tank 6 and the air source equipment 3, the communicating pipeline of the fluidizing device 7 and the air source equipment 3 and the pipeline of the conveying pipe 9 and the air source equipment 3, so that the pressure and the air input speed in the powder spraying tank 6, the fluidizing device 7 and the air conveying pipe 2 can be observed and adjusted conveniently.
Example two
In the present embodiment, as shown in fig. 1 to 2, the ingot casting apparatus includes the powder spraying device 100 and the ingot mold 4 for improving ingot casting defects in the first embodiment, an output end of the pneumatic conveying pipe 2 is disposed in molten steel in the ingot mold 4, and a powdered inorganic heat absorbing material is used as a coolant, so that transportation is facilitated; the powder adding device 1, the pneumatic conveying pipe 2 and the gas source equipment 3 are also adopted to introduce inorganic heat-absorbing material powder into the molten steel through gas, and the gas introduced into the gas in the molten steel can make the molten steel roll and flow in the ascending process, so that the mixing speed and uniformity of the inorganic heat-absorbing material powder and the molten steel are increased, the superheat degree in the molten steel is effectively reduced, the inorganic heat-absorbing material addition success rate can be improved, the solidification phase and macro-segregation of the cast ingot can be effectively improved, and the quality of the cast ingot is improved; meanwhile, the gas introduced into the molten steel and the heat-absorbed inorganic material can absorb impurities in the molten steel in the process of floating upwards, purify the molten steel and further improve the quality of cast ingots.
The optimal dosage of the inorganic material is to reduce the superheat degree of the molten steel by 3-10 ℃.
EXAMPLE III
Ingot casting is carried out on the experimental steel type 1 by adopting the ingot casting equipment in the second embodiment, wherein the model of the experimental steel type 1 is H13, and the smelting alloy comprises the following components: c is 0.32-0.45; 0.8 to 1.20 percent of Si; 0.20 to 0.50 Mn; 0.30 percent of S; p is 0-0.030; 4.75-5.50 parts of Cr; v is 0.80 to 1.20; 1.10 to 1.75 parts of Mo. The ingot weight was 40 t. The external refractory material of the nozzle is prepared by pouring pure calcium aluminate cement combined corundum, and the inorganic materials are CaO and CaF2A mixture of CaO and CaF2The molar ratio is 14.5: 85.5; the method comprises the following specific steps:
s1, firstly, installing the nozzle 10 in a steel ingot mould and fixing the nozzle on a lifting device;
s2, when the discharge valve of the powder spraying tank is closed, the supply valve of the conveying pipe 9 is firstly opened, and the carrier gas flow of the conveying pipe 9 is adjusted to 8-12 m3Blowing the conveying pipe 9 in a powder-free state, dredging a pipeline, preheating a spray head before powder spraying, wherein the preheating temperature is preferably 600-800 ℃;
s3, weighing inorganic heat absorbing materials with the weight of about 62.07kg, pouring the inorganic heat absorbing materials into a storage bin 8, then opening a feed valve 14, and closing the feed valve 14 after all the inorganic heat absorbing materials enter a powder spraying tank 6;
s4, opening an air inlet valve of the fluidizing device, pressurizing the powder spraying tank 6 according to the selected pressure of 0.22-0.30 MPa, and closing the air inlet valve of the fluidizing device after the inorganic heat absorbing material powder is fluidized;
s5, opening a stamping pipeline at the upper part of the powder spraying tank 6, and pressurizing the powder spraying tank 6 to 0.37-0.50 MPa; when the pressure in the powder spraying tank 6 is equal to the pressure in the pneumatic conveying pipeline 2, the preparation work is finished;
s6, pouring molten steel in a steel ingot mould in a bottom pouring mode, wherein the pouring temperature is 1490 ℃. Checking that the powder spraying tank 6 and various instruments of the pipeline are in a normal state, and preheating an ingot mold before casting molten steel, wherein the preheating temperature is preferably 30-80 ℃;
s7, when the molten steel casting is finished, opening the discharge valve 15 to start to convey inorganic heat absorbing material powder, and controlling the air blowing amount of the pneumatic conveying pipeline 2 to be 150L/min-200L/min; in the process of blowing the inorganic powder material by the nozzle 10, the nozzle 10 is lifted upwards by the lifting device 5, the height position of the nozzle 10 is changed, the inorganic heat-absorbing material absorbs sensible heat in the molten steel to melt and float to the surface after blowing for 3-4 min, so that the superheat degree of the molten steel is reduced by about 5 ℃, after the powder blowing is finished, the operation of the tank is stopped, and the nozzle is withdrawn.
Example four
Ingot casting is carried out on the experimental steel type 2 by adopting the ingot casting equipment in the second embodiment, wherein the model of the experimental steel type 2 is 738, and the smelting alloy comprises the following components: c is 0.38; 1.30 parts of Mn; 1.85 parts of Cr; 0.40 parts of Mo; 0.008S. The ingot weight was 19 t. The outer material of the spray gun is prepared by pouring pure calcium aluminate cement and corundum. The inorganic materials are CaO and CaF2A mixture of CaO and CaF2The mol ratio is 14.5:85.5, and the specific steps are as follows:
s1, firstly, installing the nozzle 10 in a steel ingot mould and fixing the nozzle on a lifting device;
s2, when the discharge valve of the powder spraying tank is closed, the supply valve of the conveying pipe 9 is firstly opened, and the carrier gas flow of the conveying pipe 9 is adjusted to 8-12 m3H, blowing the conveying pipe 9 in a powder-free state, and dredging the pipeline;
s3, weighing inorganic heat absorbing material with the weight of about 29.561kg, pouring the inorganic heat absorbing material into a bin 8, then opening a feed valve 14, and closing the feed valve 14 after all the inorganic heat absorbing material enters a powder spraying tank 6;
s4, opening an air inlet valve of the fluidizing device, pressurizing the powder spraying tank 6 according to the selected pressure of 0.15-0.22 MPa, and closing the air inlet valve of the fluidizing device after the inorganic heat absorbing material powder is fluidized;
s5, opening a stamping pipeline at the upper part of the powder spraying tank 6, and pressurizing the powder spraying tank 6 to 0.23-0.37 MPa; when the pressure in the powder spraying tank 6 is equal to the pressure in the pneumatic conveying pipeline 2, the preparation work is finished;
s6, pouring molten steel in a steel ingot mould in a bottom pouring mode, wherein the pouring temperature is 1540 ℃. Checking that the powder spraying tank 6 and each instrument of the pipeline are in a normal state;
s7, when the molten steel casting is finished, opening the discharge valve 15 to start to convey inorganic heat absorbing material powder, and controlling the air blowing amount of the pneumatic conveying pipeline 2 to be 150L/min-200L/min; in the process of blowing the inorganic powder material by the nozzle 10, the nozzle 10 is lifted upwards by the lifting device 5, the height position of the nozzle 10 is changed, the inorganic heat-absorbing material absorbs sensible heat in the molten steel to melt and float to the surface after blowing for 3-4 min, so that the superheat degree of the molten steel is reduced by about 5 ℃, after the powder blowing is finished, the operation of the tank is stopped, and the nozzle is withdrawn.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. The utility model provides a powder spray device of ingot casting defect improves which characterized in that: the method comprises the following steps: the powder feeding device comprises a powder feeding device, a pneumatic conveying pipeline and air source equipment, wherein the output end of the air source equipment and the output end of the powder feeding device are communicated with the input end of the pneumatic conveying pipeline, the output end of the pneumatic conveying pipeline is used for being placed in molten steel in a steel ingot mold, and the powder feeding device can feed inorganic heat absorption powder into the pneumatic conveying pipeline.
2. The powder spraying device for improving the defects of the ingot casting as claimed in claim 1, wherein: the lifting device is characterized by further comprising a lifting device, the lifting end of the lifting device is fixedly connected with the output end of the pneumatic conveying pipeline, and the lifting device can change the height position of the output end in the powder spraying process of the output end.
3. The powder spraying device for improving the defects of the ingot casting as claimed in claim 1, wherein: the powder adding device comprises a powder spraying tank and a fluidizing device, the lower part of the powder spraying tank is communicated with the fluidizing device, the fluidizing device and the upper part of the powder spraying tank are communicated with an output port of the air source equipment, an output pipe of the fluidizing device is communicated with the pneumatic conveying pipeline, the fluidizing device is used for fluidizing inorganic heat absorption powder in the powder spraying tank, and the air source equipment inputs gas in the powder spraying tank and can keep that the air pressure in the powder spraying tank is not less than the pressure in the pneumatic conveying pipeline.
4. The powder spraying device for improving the defects of the ingot casting as claimed in claim 3, wherein: the powder adding device further comprises a storage bin, and an outlet pipe of the storage bin is communicated with the upper part of the powder spraying tank.
5. The powder spraying device for improving the defects of the ingot casting as claimed in claim 1, wherein: the pneumatic conveying pipeline comprises a conveying pipe and a spray head, one end of the conveying pipe is communicated with the powder adding device and the air source equipment, the other end of the conveying pipe is communicated with the spray head, and the spray head is used for being placed in the steel ingot mold.
6. The powder spraying device for improving the defects of the ingot casting as claimed in claim 5, wherein: the shower nozzle includes honeycomb duct and nozzle, the one end of honeycomb duct with the conveyer pipe intercommunication, the other end of honeycomb duct with the nozzle intercommunication, the honeycomb duct with the fixed cladding has the flame retardant coating on the lateral surface of nozzle.
7. The powder spraying device for improving the defects of the ingot casting as claimed in claim 6, wherein: the honeycomb duct is a steel pipe, and the refractory layer is made of magnesia carbon refractory materials or corundum.
8. The powder spraying device for improving the defects of the ingot casting as claimed in claim 4, wherein: the outlet pipe of the storage bin is provided with a feed valve, and the output pipe of the fluidizing device is provided with a discharge valve.
9. The powder spraying device for improving the defects of the ingot casting as claimed in claim 4, wherein: and a pressure gauge and a flow meter are arranged on a communicating pipeline of the powder spraying tank and the air source equipment, a communicating pipeline of the fluidizing device and the air source equipment and a pipeline communicated with the conveying pipe and the air source equipment.
10. An ingot casting equipment is characterized in that: the powder spraying device for improving the ingot defects comprises the powder spraying device for improving the ingot defects and the ingot mold according to any one of claims 1 to 9, wherein the output end of the pneumatic conveying pipeline is placed in molten steel in the ingot mold.
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