CN107653429B - Accumulative pressure high frequency detonation-gun - Google Patents
Accumulative pressure high frequency detonation-gun Download PDFInfo
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- CN107653429B CN107653429B CN201610594617.XA CN201610594617A CN107653429B CN 107653429 B CN107653429 B CN 107653429B CN 201610594617 A CN201610594617 A CN 201610594617A CN 107653429 B CN107653429 B CN 107653429B
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Abstract
The present invention is a kind of accumulative pressure high frequency detonation-gun, detonation frequency 20-30Hz.Spray gun is made of the part such as the first and second mixers, the first and second explosion chambers and a rifle tube nozzle.Use oxygen and propane for process gas, after being introduced into the mixing of the first mixer, into the first explosion chamber, ignited after-explosion, volume expansion simultaneously generate pressure, pass through one of porous ring, into the second mixer, secondary gas is imported again herein, through mixing ignition, into the second explosion chamber explode, caused by pressure superposition, generate stronger blast wave and more high thrust, nozzle is rushed in, and closes powder, through compressing, blast wave raises speed pressurization once again, high-speed punching delivery nozzle, forms coating.In addition to detonation-gun is as core equipment, there are also corollary equipments such as control cabinet, powder feeder and distributor boxes, these equipment belong to Beijing joint coating technology Co., Ltd special configuration and manufacture.Whole systems carry out process control by computer programming.
Description
Technical field
The present invention is a kind of accumulative pressure high frequency detonation-gun, is a kind of technique of thermal spraying, belongs to thermal jet in Surface Engineering
Apply technical field.
Background technique
Plasma spray technology is an important composition in surface engineering technology.The technology, which has, exceedes century-old development course.Its
Basic process is that thermal spraying material (powder, silk or stick) is passed through certain device, is melted or semi-molten, then pushing away in air-flow
Under dynamic, with very high velocity spray on the surface of workpiece, the coating with certain function is formed.According to material and spraying method
Difference, coating performance can wear-resisting, anti-corrosion, high temperature resistant and other multiple functions.
According to heat source or the difference of flame structure, thermal spraying can divided combustion flame-spraying, electric arc spraying, plasma spraying, quick-fried
Fried spraying, supersonic flame spraying and cold spraying etc..
Detonation flame spraying originates in last century mid-term, the successive Shen of U.S. combinating carbide company and the academy of sciences, Ukraine, the former Soviet Union
Patent is reported, since then, underwent for more than 60 years, improves in performance less, generally all uses barrel type structure, one end is opened
Mouthful, one end is fed into powder, air inlet, acetylene from side.
Use oxygen and acetylene for process gas, gas lights explosion after entering gun body mixing, and blast wave is taken same powder and gone out
Gun barrel forms coating, detonation frequency 2-10Hz, and each period includes air inlet, compression, explosion and is vented four steps, each
Period will be cleaned with nitrogen.
In development in the future, some improvement are carried out to lance body structure, oxygen and fuel gas all enter from gun body one end, powder
End enters from side, is provided with a mixer and an explosion chamber, but the improvement of basic structure same.
Detonation flame spraying in practical applications, is especially widely used not as good as supersonic flame spraying, mainly not as good as other methods
Reason has three, first is that monopolize the time to it long for author, from be unwilling to transfer the possession of or sell outward, second is that equipment operation is not flexible, behaviour
It is inconvenient to make, and can only construct in the horizontal direction, third is that spraying rate is too slow, obtains certain coating layer thickness or area with much
Time, while operating cost is higher etc..
The present invention be directed to some disadvantages and problems existing for existing detonation flame spraying equipment, have developed a kind of accumulative pressure high frequency
Rate detonation-gun.
Summary of the invention
Accumulative pressure high frequency detonation-gun nuclear structure, including two mixers, two explosion chambers and a tubular nozzle.Work
Skill gas (propane and oxygen) has two air inlets of beginning to introduce respectively, is sufficiently mixed through first of mixer, into the first explosion
Room is exploded by plug ignition, and explosive combustion product is mixed by the porous distribution rings together of end into second
There are oxygen port and gas port in device, side again, are filling into process gas, enter the second explosion chamber together with combustion product, quick-fried again
It is fried.Due to filling into secondary gas, explosion energy is bigger, and blast wave is stronger, rushes at the tubular nozzle of end.It is equipped at nozzle tip
Together thus annular powder mouth, powder enter nozzle, are condensed by powerful blast wave and burst cloud, generate after being compressed by nozzle high
Fast powder stream rushes at workpiece, forms coating.
In addition to above-mentioned detonation-gun, there are also power control cabinet, gas control cabinet, powder feeder and distributor boxes for a full set of system, in operation
Program and technological parameter deployed to ensure effective monitoring and control of illegal activities, regulation and control.
Detailed description of the invention
A, b, c in Fig. 1 respectively indicate control cabinet (cabinet containing gas control), powder feeder and the distributor box to match with the present invention.
Fig. 2 illustrates high frequency detonation-gun cross-sectional view of the invention, in which: the first explosion chamber of 1-, the first mixer of 2-, 3-
Spark plug, the second mixer of 4-, the second explosion chamber of 5-, 6- nozzle, 7- propane import, 8- oxygen and air intlet, 9- oxygen inlet,
10- powder adds nitrogen, 11- cooling-water duct.
Fig. 3 explosive flame pattern a- only uses the first explosion chamber, and b- adds pattern after powder with two explosion chambers, c-.
Fig. 4 detonation flame spraying actual motion a- sprays cylindrical body, and b- sprays plane.
Fig. 5 sprays metallograph a-Al2O3, b-WC10Co4Cr, c-Ti, d- multiple material coating, wherein 5- matrix (Ni
Alloy) 4-CoCrAlY, 3-ZrSiO4, 2-Al2O3, 1-ZrB2+MoSi2。
Fig. 6 sprays material object a- iron-base workpiece, b, c, d- titanium-based workpiece, e- aluminium base workpiece.
Specific embodiment
Oxygen and propane flammable gas are entered by the first mixer entrance, and pressure is respectively 0.2MPa and 0.4MPa.In the mixer
It explodes by plug ignition after-combustion.Explosive flame breaks through one of cyclic annular porous distribution rings after the explosion chamber, into second
Burn mixing chamber, and converges second process gas here, and into the second explosion chamber combustion explosion again, explode combustion gas and nozzle
The powder entered at beginning forms powder and bursts cloud, enters nozzle at a high speed, is compressed again in nozzle, forms strong shock wave
Nozzle is gone out, can finally powder be made to accelerate to 1200 ± 200m/s.
Spark plug open when, nitrogen, oxygen, air and propane, these four gases in the first and second mixers, according to
Certain sequence and interval are opened, and are equipped with 8 steps, final step is powder feeding, subsequently into the stable operation depending on program
State, all these steps are all to preset and be included in controllable program, and before igniting, control program is to cooling water and gas supply
Flow and pressure and other parameters all carry out self-test and adjustment.
In normal operation on startup, the first and second explosion chambers are lighted, and differing is 4 seconds, when frequency is 20Hz,
Process gas is 0.05 second full of explosion chamber to the period that combustion gas sprays, and blast process and combustion product spray and need 0.01 second, from
And the decompression cycle period of explosion chamber and nozzle is enough to ensure that explosion chamber has sufficient service life.In this way, explosion chamber can be made
In low-pressure state, guarantee process gas and the smooth infeed of powder.
The pressure and speed of combustion product, are the important indicator of blast process, in this regard, needing to further illustrate.Using oxygen and
Propane is process gas, is tested single explosion chamber and two explosion chambers.
The result shows that the pressure spike time span (peak starts to end) of generation is 0.3 milli when using single explosion chamber
Second, and its Mach of internode is 1209m/s away from the calculating speed for 26 ㎜, combustion product；When connecting two explosion chambers, pressure spike
Time span be 0.43 millisecond, pressure be 3.0 ± 0.15MPa, Mach internode away from be 36 ㎜, combustion product speed be 1733m/s.
After spray gun is in stable state, after measured, up to 80%-90%, ceramic powder is then the deposition efficiency of metal and Metal-ceramie powder
60%-70%, process gas supply are as follows: propane 0.6-1.6m3/h, oxygen 3-8m3/h.The speed that metal powder forms coating is 3
㎏/h, Metal-ceramie powder are then 2 ㎏/h, and ceramic powder is 1 ㎏/h.
It is not high using oxygen and the supply pressure of combustion gas, the service efficiency of gas is not only increased, and operate conveniently,
Equipment operational safety is effective.Gas transmission and powder feeding are connected by flexible conduit, transport spray gun can in horizontal, vertical or certain angle
Row, it is mountable on any 3-D spraying vehicle or sextuple manipulator.
After actual measurement, the initial pressure supplied gas is 0.2-0.4MPa, using the gaseous mixture oxygen of propane and butane, through firing
Pressure is up to 3.0 ± 0.15MPa afterwards, and the combustion product that nozzle sprays at this time is up to 1700 ± 100m/s.Since combustion product is released
The heat put is relatively low, but is enough to ensure that the excellent coating of forming properties in the case where spray is away from not long (60-80 ㎜), both mentions
High deposition efficiency, in turn avoids the oxidation and loss of material, and this feature makes the thickness of workpiece be reduced to the feelings of 0.3-1.0 ㎜
It can also be sprayed under condition, to extend practical application.Further analysis shows that an explosion period, explosion product and room is fired
The time of contact of wall is only 1.0 × 10-3Second, to be reduced to the intensity of cooling of explosion chamber and nozzle minimum, simplify cold
But system reduces costs.
Compared with the HVOF technology for currently applying many years in the industrial production, advantages of the present invention is very prominent: particle
Flying speed may be up to 1200 ± 200m/s, porosity < 1%, all kinds of powder such as energy metal spraying category, cermet and ceramics, operation spirit
It is living, convenient for cooling, sprayable very thin workpiece, deposition efficiency is high, and degree of oxidation is low etc..
Another advantage of this fermentation is that power consumption is low with oxygen demand, by test, in the case where obtaining same coating weight,
Electricity consumption and gas consumption are all fewer than HVOF dosage.
Since gas consumption is few, exhaust gas and waste heat are greatly decreased, and are reduced to environmental hazard.
Spray example: utilize spray gun of the present invention, spraying WC12Co powder, produce 1000g coating, to various gases, electric power and
The consumption of vulnerable part, the comparison carried out with other spraying methods, is as a result shown in Table 1.As seen from the table, guaranteeing coating performance
While, operating cost is substantially reduced.The metallograph of coating shows its good performance.
Table 1: the consumption of several spraying methods
Claims (8)
1. a kind of accumulative pressure high frequency detonation-gun, it is characterised in that: by two mixers, two explosion chambers and a set of tubular nozzle
Composition, using oxygen and propane as process gas, by entering the first explosion chamber after the mixing of the first mixer, through spark ignitor after-explosion,
One of porous ring is broken through in explosion combustion gas, is entered the second explosion chamber with certain high moderate pressure and is exploded again, blast wave pours pipe
Shape nozzle is equipped with cyclic annular powder mouth at nozzle tip, with explosion combustion gas mixing under nitrogen drive, pours elongated tubular spray together
Mouth, under compressed in nozzle, chemical reaction, air-flow viscous motion and pressure superposition multiple-effect, the fly out speed of nozzle of powder reaches
1200m/s makes powder fusing or semi-molten beyond 3000 DEG C of flame temperature heating powder, rapidly impacts workpiece surface and is formed
Coating.
2. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, it is characterised in that frequency 20Hz.
3. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, it is characterised in that by two mixers, two explosions
Room and a cast nozzle composition, combustion product makes system pressure be superimposed and be strengthened by explosion twice in operation, from
And generate powerful combustion wave.
4. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, it is characterised in that use propane and oxygen for technique
The infeed pressure of gas, oxygen and propane is respectively 0.2MP a and 0.4MP a, provides high density energy for system.
5. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, it is characterised in that connect gas transmission by flexible conduit
And powder feeding, the comprehensive operating of spray gun, flexible and convenient operation can be made.
6. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, which is characterized in that each operation cycle is all continuous
, without being also rinsed with nitrogen in each period, the time is saved, operation is simplified.
7. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, it is characterised in that high frequency explosion, spraying interval are only
1/20 second, the deposition velocity of coating is accelerated, production efficiency is improved.
8. a kind of accumulative pressure high frequency detonation-gun as described in claim 1, just because of there are two mixers and twice to supply gas,
And there are two explosion chambers, cause spray gun gas mixing abundant, fire strongly, blast wave high speed, high pressure and high temperature fly powder
Scanning frequency degree up to 1200-1700m/s, coating binding force is strong, and consistency is higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594617.XA CN107653429B (en) | 2016-07-26 | 2016-07-26 | Accumulative pressure high frequency detonation-gun |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594617.XA CN107653429B (en) | 2016-07-26 | 2016-07-26 | Accumulative pressure high frequency detonation-gun |
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| Publication Number | Publication Date |
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| CN107653429A CN107653429A (en) | 2018-02-02 |
| CN107653429B true CN107653429B (en) | 2019-07-26 |
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| CN113122793A (en) * | 2021-04-14 | 2021-07-16 | 西北工业大学 | Explosion spraying device |
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| CN1078272A (en) * | 1993-05-22 | 1993-11-10 | 北京钛得新工艺材料有限公司 | Detonation flame spraying method and equipment thereof |
| ATE301004T1 (en) * | 1999-10-28 | 2005-08-15 | Aerostar Coatings Sl | HIGH FREQUENCY AND HIGH EFFICIENCY DETONATION GUN |
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