CN111734826B - Composite sealing assembly, plasma rotating electrode atomization powder making equipment and powder making method - Google Patents
Composite sealing assembly, plasma rotating electrode atomization powder making equipment and powder making method Download PDFInfo
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- CN111734826B CN111734826B CN202010713857.3A CN202010713857A CN111734826B CN 111734826 B CN111734826 B CN 111734826B CN 202010713857 A CN202010713857 A CN 202010713857A CN 111734826 B CN111734826 B CN 111734826B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
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Abstract
The invention relates to a composite sealing assembly, a powder making device and a powder making method, and relates to the technical field of powder making. The composite sealing assembly comprises a V-shaped sealing ring, a fixed plate, a movable plate, a flange, a V-shaped cushion block and a locking nut; a cavity is arranged in the fixed plate, and a movable plate capable of moving up and down is arranged in the cavity; the fixing plate is fixedly connected with the flange, the V-shaped sealing ring is arranged on the inner side of the flange, the outer side face of the flange is connected with a locking nut, and a V-shaped cushion block is arranged between the V-shaped sealing ring and the locking nut. The powder-making equipment comprises a feeding platform, a rotary driving device and an atomizing chamber, wherein the opening of the atomizing chamber is provided with the composite sealing assembly. The milling method comprises the steps of enabling the electrode bar stock to pass through the composite sealing assembly, milling, withdrawing from the composite sealing assembly and the like. The V-shaped sealing ring of the composite sealing assembly can firstly carry out tight sealing on electrode bars and the like, and the movable plate carries out secondary sealing on the electrode bars and the like, so that the air leakage of an atomizing chamber is prevented, the sealing effect is improved, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of powder making, in particular to a composite sealing assembly, plasma rotating electrode atomization powder making equipment and a powder making method.
Background
The plasma rotating electrode atomization powder preparation (PREP) technology is a metal powder preparation method based on a high-speed rotating centrifugal atomization principle, and the metal powder produced by the technology is widely applied to the powder metallurgy fields of Hot Isostatic Pressing (HIP), thermal spraying, porous catalytic packing and the like due to the excellent performance of the metal powder. Titanium-aluminum alloy (brittle difficult-to-process material) is a novel light high-temperature material for engines with great application potential, and a microstructure which is thinner and has smaller interlayer spacing than cast metallurgy can be obtained by a powder metallurgy near-net forming technology. Compared with the inert gas atomization powder making technology, the rotary electrode technology can directly disperse the metal liquid flow atomization without high-speed air flow, so that hollow powder particles generated by umbrella effect in the high-speed gas atomization method can be avoided, and the PREP technology is an ideal technology for preparing titanium-aluminum alloy powder.
At present, the traditional continuous production process of the PREP technology is to machine a metal blank into an electrode bar, wherein one end of the electrode bar is processed into an internal thread, and the other end of the electrode bar is processed into an external thread. And during powder preparation, the external thread of the previous electrode bar is connected with the internal thread of the next electrode bar to realize continuous production.
At present, due to process requirements, single powder preparation is required in the actual production process of PREP powder preparation. The internal thread of the bar made of brittle material is difficult to process, and only the external thread can be processed. The existing PREP production technology is to process external threads on the brittle material, and the brittle material is sent into an atomizing chamber through the external thread connection of a transition rod and the brittle material during powder making. After the powder preparation is finished, the transition rod and the stub bar are drawn out from the atomizing chamber, then the stub bar is detached from the transition rod, and a new electrode bar is connected for continuous production.
The problem that prior art exists is mainly that the sealing device that the atomizing chamber opening part set up seals the effect poorly, when leading to the stub bar of transition stick and fragile electrode bar to take out the back from the atomizing chamber and carry out new electrode bar and change, the inert atmosphere in the atomizing chamber is destroyed, needs to carry out the atomizing chamber evacuation once more when carrying out next production, fills inert gas operation. Therefore, each bar needs to be vacuumized and filled with inert gas again when being milled, so that the problems of large consumption of the inert gas, low production efficiency, high cost and the like are caused.
Accordingly, there is a need to ameliorate one or more of the problems with the related art solutions described above.
It is noted that this section is intended to provide a background or context to the embodiments of the disclosure that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Disclosure of Invention
It is an object of the present invention to provide a composite seal assembly, plasma rotating electrode atomizing milling apparatus and milling method that overcome, at least to some extent, one or more of the problems associated with the limitations and disadvantages of the related art.
The first aspect of the invention provides a composite sealing assembly for sealing an atomizing chamber of a plasma rotating electrode atomizing powder making device, comprising: the V-shaped sealing ring, the fixed plate, the movable plate, the flange, the V-shaped cushion block and the locking nut;
a cavity in the vertical direction is formed in the fixed plate, the upper end face of the cavity is open, a movable plate is arranged in the cavity, the movable plate is arranged in the cavity in a sliding mode and can move up and down along the vertical direction, a through hole is formed in the fixed plate in the transverse direction, and the through hole penetrates through the cavity;
one side of the fixing plate is fixedly connected with the flange, the V-shaped sealing ring is arranged on the inner side of the flange, a locking nut is connected to the outer side face of the flange in a threaded mode, and a V-shaped cushion block is arranged between the V-shaped sealing ring and the locking nut.
Preferably, the left side and the right side of the movable plate are both provided with O-shaped sealing rings, and when the movable plate moves downwards to the through hole, the O-shaped sealing rings are abutted to the edge of the through hole.
Preferably, the flange is provided with a vacuum pipeline penetrating through the side wall of the flange, and the vacuum pipeline is communicated with a vacuum system.
Preferably, the movable plate is fixedly connected with a piston rod of the cylinder.
Preferably, the inside wall of cavity is equipped with the slide of vertical direction, the fly leaf passes through the slide with fixed plate sliding connection.
Preferably, the outer surface of the flange is provided with an external thread, the locking nut is provided with an internal thread, and the internal thread is matched with the external thread.
Preferably, the locking nut is abutted against one side of the V-shaped cushion block, and the other side of the V-shaped cushion block is abutted against the V-shaped sealing ring.
Preferably, the opening side of the V-shaped sealing ring faces the direction of the lock nut.
The second aspect of the invention provides a plasma rotating electrode atomization powder making device, which comprises:
a feeding platform;
a rotation driving device: is arranged on the feeding platform;
an atomization chamber: the composite sealing assembly is arranged on one side of the feeding platform, the composite sealing assembly in any one of the above embodiments is arranged on the outer side of the opening of the atomizing chamber, the fixing plate of the composite sealing assembly is fixedly connected with the outer side of the opening of the atomizing chamber, and the opening of the atomizing chamber is opposite to the rotary driving device;
plasma gun: the atomization chamber is arranged in the atomization chamber and is opposite to the opening of the atomization chamber;
inert gas system and vacuum system: the inert gas system and the vacuum system are respectively communicated with the atomizing chamber.
Preferably, the right side of the composite sealing assembly can be further connected with a floating roller assembly, and the floating roller assembly is arranged on the inner side of the opening of the atomizing chamber and used for limiting the electrode bar.
A third aspect of the present invention provides a powdering method comprising:
connecting an electrode bar and a transition rod, fixing the transition rod on a rotary driving device, feeding the electrode bar and the transition rod to a platform to drive the electrode bar and the transition rod to pass through a composite sealing assembly, vacuumizing an atomizing chamber, filling inert gas, and then advancing the electrode bar into the atomizing chamber to carry out plasma rotary electrode atomization powder preparation;
after the electrode bar materials are milled, the electrode bar materials are fed into the platform to drive the transition rod and the electrode bar materials to exit from the atomizing chamber and then exit from the composite sealing assembly;
detaching the electrode bar stock from the transition bar, and connecting a new electrode bar stock;
the feeding platform drives new electrode bar materials and the transition bar to pass through the composite sealing assembly, and the new electrode bar materials advance into the atomizing chamber to carry out plasma rotating electrode atomizing powder preparation;
the composite sealing assembly is arranged on the outer side of the opening of the atomizing chamber, and a fixing plate of the composite sealing assembly is fixedly connected with the outer side of the opening of the atomizing chamber.
Preferably, after the electrode bar stocks are withdrawn from the composite sealing assembly, the movable plate moves downwards to seal the atomizing chamber.
Preferably, after a new electrode bar passes through the composite sealing assembly, a vacuum system is started to vacuumize the composite sealing assembly, and then the electrode bar enters the atomizing chamber to be pulverized.
In one embodiment of the disclosure, the tightness degree between the V-shaped sealing ring and the transition rod is correspondingly adjusted by adjusting the position of the locking nut on the outer side surface of the flange.
The invention can realize the following beneficial effects:
the V-shaped sealing ring of the composite sealing assembly can firstly carry out tight sealing on the passing electrode bar, when the electrode bar further passes through the through hole on the fixed plate, the movable plate can move upwards to allow the electrode bar to pass through, and the electrode bar can move downwards to carry out instant sealing on the electrode bar through the rear movable plate, so that external gas is prevented from entering the atomizing chamber. Utilize the double seal effect of V type sealing washer and fly leaf, promoted sealed effect greatly, and then promote production efficiency to improve.
After the single powder process, electrode bar and transition stick at first withdraw from the atomizer chamber, then withdraw from composite seal subassembly, composite seal subassembly can in time carry out good sealing to the atomizer chamber, prevent that the gas in the atomizer chamber from spilling, also prevent simultaneously that external gas from getting into the atomizer chamber, make and carry out next time powder process during operation again, need not carry out the evacuation once more to the atomizer chamber, fill inert gas's operation, reduce inert gas's consumption by a wide margin, the powder process efficiency is improved, the powder process cost is reduced simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 shows a schematic structural view of a composite seal assembly through which a transition bar and electrode bar stock pass in an embodiment of the invention;
FIG. 2 shows a schematic structural view of a composite seal assembly (with transition bar and electrode bar stock withdrawn from a moving plate of the composite seal assembly) in yet another embodiment of the invention;
FIG. 3 shows a schematic of the construction of a composite seal assembly (with the transition bar and electrode bar stock withdrawn from the moving plate of the composite seal assembly) in yet another embodiment of the invention;
FIG. 4 is a schematic structural diagram of a plasma rotating electrode atomization powder making device in an embodiment of the invention;
FIG. 5 shows an electron micrograph of a titanium-aluminum alloy powder in an example of the invention;
fig. 6 is a powder making flow chart in the embodiment of the invention.
Reference numerals:
1. the device comprises a rotary driving device, 2, a feeding platform, 3, an inert gas system, 4, a transition rod, 5, a composite sealing assembly, 5-1V-shaped sealing ring, 5-2 fixing plate, 5-2-1 through hole, 5-3 movable plate, 5-4O-shaped sealing ring, 5-5 vacuum pipeline, 5-6 flange, 5-7V-shaped cushion block, 5-8 locking nut, 6 floating roller assembly, 7 electrode bar, 8 powder product, 9 atomizing chamber, 10 plasma gun and 11 vacuum system.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The embodiment of the present invention firstly provides a composite sealing assembly 5 for sealing an atomizing chamber 9 of a plasma rotating electrode atomizing powder making device, as shown in fig. 1, which may include: the device comprises a V-shaped sealing ring 5-1, a fixed plate 5-2, a movable plate 5-3, a flange 5-6, a V-shaped cushion block 5-7 and a locking nut 5-8. A cavity in the vertical direction is formed in the fixed plate 5-2, the upper end face of the cavity is open, the movable plate 5-3 is arranged in the cavity, the movable plate 5-3 is slidably arranged in the cavity (the shape of the movable plate 5-3 can be matched with the cavity) and can move up and down in the vertical direction, a through hole 5-2-1 is transversely formed in the fixed plate 5-2, and the through hole 5-2-1 penetrates through the cavity; one side face (the left side face of the fixing plate 5-2 in the figure 1) of the fixing plate 5-2 is fixedly connected with the flange 5-6, the V-shaped sealing ring 5-1 is arranged on the inner side of the flange 5-6, the outer side face of the flange 5-6 is in threaded connection with a locking nut 5-8, and a V-shaped cushion block 5-7 is arranged between the V-shaped sealing ring 5-1 and the locking nut 5-8.
In the embodiment of the invention, the V-shaped sealing ring 5-1 in the composite sealing assembly 5 can firstly carry out tight sealing on the passing electrode bar 7, when the electrode bar 7 further passes through the through hole 5-2-1 on the fixed plate 5-2, the movable plate 5-3 can move upwards to allow the electrode bar 7 to pass through, and the electrode bar 7 can move downwards to carry out tight sealing on the electrode bar 7 through the rear movable plate 5-3 to prevent external gas from entering the atomizing chamber 9. Two structures carry out double sealing to the electrode bar 7 of process (and the transition stick 4 of process at the back, and composite seal subassembly 5 is the same to the sealed process of transition stick 4 and electrode bar 7) more than utilizing, prevent that external gas from getting into atomizer chamber 9, have promoted sealed effect greatly, and then promote production efficiency and improve.
Optionally, in some embodiments, as shown in fig. 2, O-ring seals 5-4 are disposed on both left and right sides of the movable plate 5-3, before milling, the movable plate 5-3 is located at the bottom end of the cavity, the O-ring seals 5-4 are in contact with the edge of the through hole 5-2-1, and the movable plate 5-3 blocks the through hole 5-2-1 to prevent external air from entering the atomizing chamber 9, thereby achieving a sealing effect. After the milling is finished, after the electrode bar 7 is drawn out of the composite sealing assembly 5, the movable plate 5-3 also moves downwards to seal the through hole 5-2-1, so that the gas in the atomizing chamber 9 is prevented from leaking out of the composite sealing assembly 5, and a better sealing environment is formed.
Optionally, in some embodiments, as shown in fig. 3, the flange 5-6 may be provided with a vacuum line 5-5 extending through a sidewall of the flange 5-6, and the vacuum line 5-5 may be in communication with a vacuum system 11. When the transition bar 4 and the electrode bar 7 pass through the composite sealing assembly 5, a small amount of air leakage may be generated, and the air in the composite sealing assembly 5 can be pumped out through the vacuum pipeline 5-5 by using the vacuum system 11, so that the better sealing effect is generated.
Optionally, in some embodiments, the movable plate 5-3 may be fixedly connected to a piston rod of the cylinder, the movable plate 5-3 may move up and down by using the up-and-down movement of the piston rod, when the electrode bar 7 needs to pass through the through hole 5-2-1, the movable plate 5-3 moves up to pass through the through hole 5-2-1, and after the electrode bar 7 passes through, the movable plate 5-3 moves down to be attached to the electrode bar 7, so as to perform a sealing function. In addition, the movable plate 5-3 may also be fixedly connected to the rack, and then the rack is engaged with the gear, and the gear is connected to the motor, so that the movable plate 5-3 is driven by the motor to move up and down, but the invention is not limited thereto.
Optionally, in some embodiments, a vertical slide is disposed on an inner side wall of the cavity, the movable plate 5-3 is slidably connected to the inner side wall of the cavity on the fixed plate 5-2 through the slide, and the movable plate 5-3 can move up and down by using the slide, which is smoother.
Optionally, in some embodiments, the outer surface of the flange 5-6 is provided with an external thread, the locking nut 5-8 is provided with an internal thread, the internal thread is matched with the external thread, and the locking nut 5-8 can move left and right through the thread.
Optionally, in some embodiments, the lock nut 5-8 abuts one side of the V-shaped spacer 5-7, and the other side of the V-shaped spacer 5-7 abuts the V-shaped sealing ring 5-1.
In this embodiment, the locking nut 5-8 can be screwed to move relative to the flange 5-6, and the locking nut 5-8 can tighten or loosen the V-shaped sealing ring 5-1, so that the inner lip of the V-shaped sealing ring 5-1 can be tightly attached to or maintain a required gap with the electrode bar 7 or the transition bar 4 entering the V-shaped sealing ring 5-1, and accordingly, the sealing or passing effect can be achieved. When the locking nut 5-8 is screwed towards the flange 5-6, the locking nut 5-8 can enable the inner lip of the V-shaped sealing ring 5-1 to contract; when the locking nut 5-8 is rotated towards the direction back to the flange 5-6, the inner lip of the V-shaped sealing ring 5-1 is restored to the original state.
Optionally, in some embodiments, the open side of the V-shaped sealing ring 5-1 faces the direction of the locking nut 5-8, and when the electrode bar 7 enters the V-shaped sealing ring 5-1, the electrode bar 7 enters the open portion of the V-shaped sealing ring 5-1 first, and then passes through the narrower portion of the V-shaped sealing ring 5-1 to gradually achieve sealing.
In the above embodiments, the flanges 5-6 may be sealing flanges.
Referring to fig. 4, the embodiment of the present invention further provides a plasma rotating electrode atomization powder manufacturing apparatus, which may include a feeding platform 2, a rotation driving device 1, an atomization chamber 9, a plasma gun 10, an inert gas system 3, and a vacuum system 11. The rotary driving device 1 is arranged on the feeding platform 2; the atomizing chamber 9 is disposed at one side of the feeding platform 2 (not at the right side in fig. 4), the composite sealing assembly 5 of any one of the above embodiments is disposed at the open outer side of the atomizing chamber 9, and the fixing plate 5-2 of the composite sealing assembly 5 is fixedly connected with the open outer side of the atomizing chamber 9, and may be fixedly connected through a flange or a screw. The opening of the atomizing chamber 9 is just opposite to the rotary driving device 1, and the plasma gun 10 is arranged in the atomizing chamber 9 and just opposite to the opening of the atomizing chamber 9. The inert gas system 3 and the vacuum system 11 are respectively communicated with the atomizing chamber 9, and the inert gas system 3 and the vacuum system 11 can respectively perform operations of filling inert gas and vacuumizing on the atomizing chamber 9.
In this embodiment, the composite sealing component 5 plays a real-time sealing role in the process that the electrode bar 7 enters and exits the atomizing chamber 9, so that the atomizing chamber 9 is prevented from leaking gas, the powder preparation is smoothly carried out, the production cost is reduced, and the production efficiency is improved.
In this embodiment, the rotation driving device 1 may rotate relative to the feeding platform 2, the rotation driving device 1 is driven by the feeding platform 2 to reciprocate relative to the atomizing chamber 9, the transition rod 4 and the electrode bar 7 are driven by the feeding platform 2 to reciprocate towards the atomizing chamber 9, and the rotation driving device 1 is driven by the atomizing chamber 9 to drive the transition rod 4 and the electrode bar 7 to rotate at a high speed, where the rotation speed may be 10000 to 100000r/min, but is not limited thereto. Before entering the atomizing chamber 9, the electrode bar 7 firstly passes through the composite sealing assembly 5 and then enters the atomizing chamber 9, when the front end of the electrode bar 7 is 30-60mm away from the end face of the plasma gun 10, feeding is stopped, then the plasma gun 10 generates plasma arcs to melt the electrode bar 7 entering the atomizing chamber 9, molten metal droplets are thrown out under the action of high-speed rotating centrifugal force to form small liquid particles, and a powder product 8 is generated, so that powder making is completed. When the electrode bar 7 comes out from the atomizing chamber 9, the electrode bar 7 also passes through the composite sealing assembly 5, the composite sealing assembly 5 can play a role in real-time sealing when the transition rod 4 and the electrode bar 7 enter and exit the atomizing chamber 9, gas in the atomizing chamber 9 is prevented from leaking, the process that the atomizing chamber 9 is vacuumized and filled with inert gas in the powder making process at each time is reduced, the PREP continuous production of fragile materials difficult to process is realized, the process flow is simplified, and the powder making efficiency is improved.
Optionally, in some embodiments, a 15-30 ° leading-in angle is provided at the front end of the transition rod 4, so that the transition rod 4 can smoothly and quickly enter the composite sealing assembly 5, and the possibility of air leakage of the atomization chamber 9 is reduced.
Optionally, in some embodiments, the diameter of the transition rod 4 may be 1-3mm larger than that of the electrode bar 7, and the diameter difference between the two diameters is small, so that damage to the V-shaped sealing ring 5-1 caused by flanging of the stub bar in the material changing process can be avoided.
The inert gas system 3 and the vacuum system 11 are respectively communicated with the atomizing chamber 9, and the vacuum system 11 is used for vacuumizing the atomizing chamber 9 or vacuumizing the composite sealing assembly 5 through a vacuum pipeline 5-5. The inert gas system 3 provides an inert atmosphere for the electrode rod 7 in the atomization chamber 9 to facilitate the milling process. The vacuum system 11 evacuates the atomization chamber 9, for example, at a pressure of-5X 10-3Pa, but is not limited thereto. The inert gas system 3 fills argon with the purity of 99.999 percent into the vacuumized atomization chamber 9 to the positive pressure of 0.04-0.20 Mpa, but the inert gas system is not limited to the positive pressure, and the requirement of inert atmosphere of the atomization powder-making forming process is met.
Optionally, in some embodiments, the external thread of the electrode bar 7 is in threaded connection with the internal thread of the transition rod 4, the external thread of the electrode bar 7 is easy to prepare, the internal thread thereof is difficult to prepare, and is easy to break and cause waste, and the internal thread of the transition rod 4 is easy to prepare and can be in threaded connection with the electrode bar 7, so that the electrode bar 7 can be replaced conveniently.
Optionally, in some embodiments, a floating roller assembly 6 is further connected to the right side of the composite sealing assembly 5, and the floating roller assembly 6 is arranged inside the opening of the atomizing chamber 9 and used for limiting the electrode bar 7. The floating roller assembly 6 comprises a plurality of floating rollers, the plurality of floating rollers surround the electrode bar 7 and are evenly arranged, one ends of the plurality of floating rollers are fixedly connected with the inner side of the opening of the atomizing chamber 9, a certain gap is formed among the plurality of floating rollers, the electrode bar 7 penetrates through the gap, the plurality of floating rollers provide supporting force for the electrode bar 7, the position of the electrode bar 7 during rotation does not need to deviate from the axis of the electrode bar 7 too much, deflection is reduced, and the electrode bar 7 is prevented from being broken.
The electrode bar 7 enters and exits the composite seal assembly 5 as follows:
(1) the feeding platform 2 drives the transition rod 4 and the electrode bar 7 which rotate at a high speed to extend forwards to pass through the composite sealing assembly 5 to enter the atomizing chamber 9, so that melting compensation of the electrode bar 7 is realized, and feeding is stopped when only a stub bar is left after the electrode bar 7 is melted;
(2) the feeding platform 2 drives the transition rod 4 and the electrode bar 7 to retreat, when the electrode bar 7 retreats from the fixed plate 5-2 by about 10-20mm, the movable plate 5-3 descends, and when the movable plate 5-3 moves to a lower limit position, the O-shaped sealing ring 5-4 and the fixed plate 5-2 realize sealing of the atomizing chamber 9 together. The electrode bar 7 continues to retreat until the composite sealing assembly 5 is completely withdrawn;
(3) detaching the stub bar 7 from the transition bar 4, and connecting a new electrode bar 7;
(4) the feeding platform 2 continues to drive the transition rod 4 and the electrode bar 7 to extend forwards, when the electrode bar 7 penetrates through the V-shaped sealing ring 5-1, the distance between the front end face of the electrode bar 7 and the movable plate 5-3 is 10-20mm, and at the moment, the vacuum system 11 is started to carry out secondary vacuum pumping on the composite sealing assembly 5;
(5) the movable plate 5-3 moves upwards to an upper limit position, and the feeding platform 2 continues to drive the transition rod 4 and the electrode bar 7 to extend forwards.
The matching control of the composite sealing assembly 5, the transition rod 4 and the electrode bar 7 is as follows:
(1) when the atomizing chamber 9 is vacuumized, the locking nut 5-8 is screwed inwards to a position which is a certain distance away from the fixed plate 5-2, the V-shaped cushion block 5-7 is driven to extend forwards to press the V-shaped sealing ring 5-1, the outer lip of the V-shaped sealing ring 5-1 is tightly attached to the flange 5-6, the inner lip is tightly attached to the transition rod 4, and the sealing condition is met;
(2) in the powder preparation process, the locking nut 5-8 is screwed outwards to a position which is a certain distance away from the fixed plate 5-2, the V-shaped cushion block 5-7 is driven to retreat, so that the V-shaped sealing ring 5-1 is loosened, a gap of 0.2-0.3 mm exists between the inner lip of the V-shaped sealing ring 5-1 and the transition rod 4, and the small gap can realize the sealing of argon in the atomizing chamber 9 and also can prevent the inner lip of the V-shaped sealing ring 5-1 from being worn too fast at a high rotating speed to influence the service life of the V-shaped sealing ring 5-1;
(3) after milling, the locking nut 5-8 is screwed outwards to a position which is a certain distance away from the fixed plate 5-2, and the V-shaped cushion block 5-7 is driven to retreat, so that a gap of 2-3mm is formed between the inner lip of the V-shaped sealing ring 5-1 and the transition rod 4, and the V-shaped sealing ring 5-1 is prevented from being scratched by the flash of a stub bar;
(4) the stub bar of the electrode bar 7 is detached from the transition rod 4, a new electrode bar 7 is installed, the electrode bar 7 extends into the V-shaped sealing ring 5-1, when the distance between the front end of the electrode bar 7 and the movable plate 5-3 is 10-20mm, the locking nut 5-8 is screwed inwards to a position with a certain distance from the fixed plate 5-2, the outer lip of the V-shaped sealing ring 5-1 is tightly attached to the flange 5-6, the inner lip is tightly attached to the electrode bar 7, and the V-shaped sealing ring 5-1 and the movable plate 5-3 form sealing.
As shown in fig. 5, fig. 5 is an electron microscope photograph of the titanium-aluminum alloy powder prepared by the plasma rotary electrode atomization powder preparing apparatus using the composite sealing assembly 5 in the above embodiment, and it can be seen that the prepared titanium-aluminum alloy powder has good performance in various aspects and meets the production requirements.
In addition, the electrode bar 7 in the above embodiment may be a circular electrode bar machined from a brittle material blank, and has a diameter of 10-100mm and a length of 100-800mm, but is not limited thereto.
Optionally, in some embodiments, the material of the V-shaped sealing ring 5-1 may be both of nitrile rubber and chloroprene rubber, but is not limited thereto.
The embodiment of the invention also provides a powdering method, as shown in fig. 6, the method comprises the following steps:
s1, connecting the electrode bar 7 with the transition bar 4, fixing the transition bar 4 on the rotary driving device 1, feeding the electrode bar 7 to pass through the composite sealing assembly 5 by the feeding platform 2, vacuumizing the atomizing chamber 9, filling inert gas, and then advancing the electrode bar 7 into the atomizing chamber 9 to carry out plasma rotary electrode atomization powder preparation;
s2, after the electrode bar 7 finishes milling, the feeding platform 2 drives the transition rod 4 and the electrode bar 7 to exit from the atomizing chamber 9, and then exits from the composite sealing assembly 5;
s3, detaching the electrode bar 7 from the transition rod 4, and connecting a new electrode bar 7;
s4, the feeding platform 2 drives a new electrode bar 7 to pass through the composite sealing assembly 5, and the new electrode bar 7 advances into the atomizing chamber 9 to carry out plasma rotating electrode atomizing powder preparation;
wherein, the composite sealing assembly 5 is the composite sealing assembly 5 of any one of the previous embodiments, the composite sealing assembly 5 is arranged outside the opening of the atomizing chamber 9, and the fixing plate 5-2 is fixedly connected with the opening of the atomizing chamber 9.
In this embodiment, before the first electrode bar 7 is milled, the atomizing chamber 9 needs to be vacuumized and filled with inert gas, and the stub bar remaining after milling first exits from the atomizing chamber 9 and then exits from the composite sealing assembly 5, and the composite sealing assembly can seal the atomizing chamber 9 immediately to prevent the inert gas in the atomizing chamber 9 from leaking. When new electrode bar 7 passes through the composite sealing assembly 5, the composite sealing assembly 5 also plays a sealing role, so that external gas is prevented from entering the atomizing chamber 9, the atmosphere of inert gas in the atomizing chamber 9 is ensured, and powder making work can be directly carried out. Greatly reducing the consumption of inert gas, improving the powder preparation efficiency and reducing the powder preparation cost.
Optionally, in some embodiments, after the electrode rod 7 exits the composite seal assembly 5, the movable plate 5-3 is moved downward for sealing. The movable plate 5-3 can be fixedly connected with a piston rod of the air cylinder, and the movement of the air cylinder is used for controlling the movable plate 5-3 to move up and down, so that the electrode bar 7 can enter and exit from the composite sealing assembly 5.
Optionally, in some embodiments, a flange 5-6 of the composite sealing assembly 5 may be provided with a vacuum pipeline 5-5 penetrating through a side wall of the flange 5-6, the vacuum pipeline 5-5 is communicated with a vacuum system 11, after a new electrode bar 7 passes through the composite sealing assembly 5, the vacuum system 11 is started to vacuumize the composite sealing assembly 5, and then the electrode bar 7 enters the atomization chamber 9 to be pulverized. After the new electrode bar 7 enters the composite sealing assembly 5, a small amount of air may be brought into the composite sealing assembly 5, and in order to prevent the air from entering the atomizing chamber 9, the vacuum system 11 may be started to vacuumize the composite sealing assembly 5, thereby ensuring smooth powder making.
Further optionally, in some embodiments, the tightness between the V-shaped sealing ring 5-1 and the transition rod 4 (or the electrode bar 7) is adjusted by adjusting the position of the locking nut 5-8 on the outer side surface of the flange 5-6. The locking nut 5-8, the V-shaped cushion block 5-7 and the V-shaped sealing ring 5-1 are sequentially connected in a mutually abutting mode, the inner lip of the V-shaped sealing ring 5-1 can be in contact with the transition rod 4, the opening degree of the V-shaped sealing ring 5-1 can be changed by adjusting the position of the locking nut 5-8, and the distance or the attaching degree between the inner lip and the transition rod 4 (or the electrode bar 7) can be effectively controlled to match with the sealing work and the powder making work. The process of mating the composite seal assembly 5 with the transition bar 4 and the electrode bar stock 7 is as previously described.
It is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like in the foregoing description are used for indicating or indicating the orientation or positional relationship illustrated in the drawings, and are used merely for convenience in describing embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (6)
1. A powdering method comprising a composite seal assembly, said composite seal assembly comprising: the V-shaped sealing ring, the fixed plate, the movable plate, the flange, the V-shaped cushion block and the locking nut;
a cavity in the vertical direction is formed in the fixed plate, the upper end face of the cavity is open, a movable plate is arranged in the cavity, the movable plate is arranged in the cavity in a sliding mode and can move up and down along the vertical direction, a through hole is formed in the fixed plate in the transverse direction, and the through hole penetrates through the cavity;
one side face of the fixing plate is fixedly connected with the flange, the V-shaped sealing ring is arranged on the inner side of the flange, the locking nut is connected with the outer side face of the flange in a threaded mode, and the V-shaped cushion block is arranged between the V-shaped sealing ring and the locking nut;
the flange is provided with a vacuum pipeline penetrating through the side wall of the flange, and the vacuum pipeline is communicated with a vacuum system;
the method comprises the following steps:
connecting an electrode bar and a transition bar, fixing the transition bar on a rotary driving device, feeding the electrode bar and the transition bar to a platform to drive the electrode bar and the transition bar to pass through a composite sealing assembly, wherein a V-shaped sealing ring in the composite sealing assembly can firstly carry out tight adhesion and sealing on the passing electrode bar, when the electrode bar further passes through a through hole on a fixed plate, a movable plate can move upwards to allow the electrode bar to pass through, and the electrode bar can move downwards to adhere to the electrode bar through a rear movable plate to prevent external gas from entering an atomization chamber; vacuumizing the atomizing chamber, filling inert gas, and then advancing the electrode bar material into the atomizing chamber to carry out plasma rotating electrode atomization powder preparation;
after the electrode bar materials are milled, the electrode bar materials are fed into the platform to drive the transition rod and the electrode bar materials to exit from the atomizing chamber and then exit from the composite sealing assembly;
detaching the electrode bar stock from the transition bar, and connecting a new electrode bar stock;
the feeding platform drives a new electrode bar and a transition bar to pass through the composite sealing assembly, after the new electrode bar passes through the composite sealing assembly, a vacuum system is started to vacuumize the composite sealing assembly, and then the new electrode bar advances into the atomization chamber to carry out plasma rotating electrode atomization powder preparation;
the composite sealing assembly is arranged on the outer side of the opening of the atomizing chamber, and a fixing plate of the composite sealing assembly is fixedly connected with the outer side of the opening of the atomizing chamber;
the right side of the composite sealing assembly is also connected with a floating roller assembly, the floating roller assembly comprises a plurality of floating rollers, the plurality of floating rollers are uniformly arranged around the electrode bar, one ends of the plurality of floating rollers are fixedly connected with the inner side of the opening of the atomizing chamber, a certain gap is formed between the plurality of floating rollers, the electrode bar passes through the gap, and the plurality of floating rollers provide supporting force for the electrode bar;
the diameter of the transition rod is 1-3mm larger than that of the electrode bar material.
2. The method of claim 1 wherein the movable plate is moved downwardly to seal the atomization chamber after the electrode rod exits the composite seal assembly.
3. The powder manufacturing method of claim 2, wherein the tightness degree between the V-shaped sealing ring and the transition rod is correspondingly adjusted by adjusting the position of a locking nut on the outer side surface of the flange.
4. The method of claim 1 wherein said movable plate is provided with O-rings on both left and right sides thereof, said O-rings abutting against the edges of said through-hole when said movable plate is moved downward to said through-hole.
5. The method of claim 1 wherein said retaining nut abuts one side of said V-shaped spacer and the other side of said V-shaped spacer abuts said V-shaped sealing ring, the open side of said V-shaped sealing ring facing the retaining nut.
6. The method of claim 1 wherein the movable plate is fixedly attached to a piston rod of the cylinder.
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| CN113492213B (en) * | 2021-09-07 | 2021-12-07 | 西安欧中材料科技有限公司 | Preparation method and equipment of high-sphericity low-oxygen-content TiAl alloy powder |
| CN114535585B (en) * | 2022-04-26 | 2022-07-19 | 西安宝德九土新材料有限公司 | Atomizing preparation facilities of superfine alloy powder |
| CN114951674B (en) * | 2022-07-16 | 2023-08-01 | 南京尚吉增材制造研究院有限公司 | Continuous feeding mechanism for rotary electrode atomization powder preparation, powder preparation equipment and powder preparation method |
| CN115854030A (en) * | 2023-02-16 | 2023-03-28 | 西安赛隆增材技术股份有限公司 | Double-sealing assembly, plasma rotating electrode atomization powder making device and powder making method |
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| JPS59117956A (en) * | 1982-06-21 | 1984-07-07 | Oval Eng Co Ltd | Sealing apparatus for wire penetration part on wall |
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| CN206936385U (en) * | 2017-04-21 | 2018-01-30 | 西安赛隆金属材料有限责任公司 | A kind of vertical powder manufacturing apparatus of plasma rotating electrode for preparing globular metallic powder |
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| FR2802916B1 (en) * | 1999-12-27 | 2002-03-15 | Cit Alcatel | PREFORM INPUT ARRANGEMENT FOR OPTICAL FIBER DRAWING OVEN, OVEN HAVING SUCH ARRANGEMENT AND PREFORM EQUIPPED TO COOPERATE WITH THIS ARRANGEMENT |
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| JPS59117956A (en) * | 1982-06-21 | 1984-07-07 | Oval Eng Co Ltd | Sealing apparatus for wire penetration part on wall |
| US4615505A (en) * | 1985-03-08 | 1986-10-07 | Environmental Elements Corp. | Fluid valve system |
| CN107420544A (en) * | 2017-04-21 | 2017-12-01 | 西安赛隆金属材料有限责任公司 | A kind of dynamic sealing device and the method for preparing globular metallic powder |
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Address after: Room 303-46, building a, Kairui, Fengcheng 12th Road, Xi'an Economic and Technological Development Zone, Shaanxi 710018 Patentee after: Xi'an Sailong Additive Technology Co.,Ltd. Address before: Room 303-46, building a, Kairui, Fengcheng 12th Road, Xi'an Economic and Technological Development Zone, Shaanxi 710018 Patentee before: XI'AN SAILONG METAL MATERIALS Co.,Ltd. |