CN86107010A - The improvement of Gad dynamic coating apparatus or the improvement relevant with this device - Google Patents

Abstract

A kind of nozzle 12 that is used for Gad dynamic coating apparatus such as spray gun is disclosed.In the coaxial airhood 13 that is contained in the spray equipment gas outlet of nozzle, and with the taper nozzle needle synergy that is installed in axial passage, make jet expansion 12 keep sealing.In the nozzle needle regracting nozzle, make medium (as coating to be sprayed) ejection.Nozzle is made by elastomeric material, when nozzle needle moves on to sealed engagement place with jet expansion, nozzle can be expanded a little.

Description

The invention relates to Gad dynamic coating apparatus,, but be not limited only to spray gun especially about spray gun.Though some people thinks that now the product of spray gun spraying is a kind of art form, but, spray gun is the instrument that artist and drawing people are used for selecting to spray coloured dyestuff or pigment, these dyestuffs or pigment are dissolved in or are dispersed in water or other liquid flux or the carrier, form look juice, coating or similar medium (for sake of convenience, hereinafter adopt " coating " speech), and, spray gun prepare advertising and commercial artistic work in application be extremely widely.

The history of spray gun is described in detail in detail, the best book of making and using is to publish Co., Ltd by London Orbis in 1980 to publish, " spray gun " (the The airbrush Book) that is collaborateed by Tombs Curtis and the Christopher Hunt of Reng-gye.This book has been described in detail from past various types of spray guns till now.As the spray gun of art supply, structure is exquisite, and cost is also very expensive.For example, traditional nozzle and/or nozzle needle (ejection of control coating) can use brass, stainless steel or platinum alloy to make.They are easily damaged.Go up the different nozzle of size because if change the outfit, change the nozzle or the nozzle needle of damage, perhaps, all must disassemble spray gun, re-assembly again after the removing in order to remove dirt.When re-assemblying, must be the nozzle needle nozzle of packing into like clockwork, guarantee that sealing also avoids defective nozzle.

Fig. 1 is the part sectioned view of existing a kind of nozzle/nozzle needle combining form.

Nozzle needle 10 has one to be the tip of taper basically, the sealed nozzle 12 of packing into.The bore of nozzle 12 can be, as: 0.2mm, the nozzle needle diameter gradually becomes cusp from 1.5mm.

The angle of cone is very little, because when nozzle needle is withdrawn, need move to obtain to change significantly the coating flow by significant, its purpose is to control preferably the coating flow, but, if the angle of nozzle needle cone is too little, during use, when nozzle needle moved on to closing position, mechanical advantage made nozzle needle tip 11 always be tending towards making nozzle to open.So not only reduced sealing effectiveness, and made spray gun lose the characteristic that the required coating controlled distributes.If the nozzle needle bending, coating can spray unevenly.If nozzle is crooked or distortion, just can not make its with nozzle needle or on every side around airhood 13 concentric assemblings regularly, it is even by the annular channels between nozzle and the airhood that air is flowed.Coating or air be jet flow unevenly, causes bespatter, splash, spraying inequality, spraying decorative pattern inharmonious by different way.Certainly, under the extreme case, needle point 11 also may make nozzle 12 rupture fully or crack.

Change these two kinds of parts of nozzle and nozzle needle, price is all quite expensive.But be the fault that causes by above-mentioned defective and may be bigger because of changing or clean the cost that time of losing pays.

Adopt nozzle needle, nozzle and the airhood spray equipment of other type of assembling with one heart, all in the weak point that has above-mentioned spray gun in varying degrees.The present invention is same relevant with the spray equipment of these other types.

The purpose of this invention is to provide a kind of improved spray nozzle device, this installation cost is low, reduces or has overcome above-mentioned weak point.

According to an aspect of the present invention, the nozzle that is used for Gad dynamic coating apparatus is provided, the passage of distribution coating is arranged on the nozzle, channel outlet front end size reduces gradually, during use, taper nozzle needle in being fixed on passage is fitted in, and forms sealing, it is characterized in that nozzle is to be made by extendible elastomeric material, when nozzle needle shifts out sealing station, nozzle can be expanded a little, treat nozzle needle withdrawal original position after, have enough resiliences to return to original-shape again.

Use this material, as: the nozzle with the plastic material of the used paint medium corrosion of anti-spray gun is made, can use littler taper nozzle needle, thereby control the coating flow better.

The nozzle made from appropriate plastic material can adopt injection moulding, and its cost is low, precision is high.The elasticity of material allows nozzle needle that bigger tolerance allowable is arranged, and still can keep sealing tight when using simultaneously, is easy to control.

With the gas vent of nozzle shaft to the spray equipment of packing into, between the coating and gas passage in spray nozzle device, nozzle itself is preferably with complete sealing device.

The outer surface of nozzle can have groove, be used for and the inner surface of spray equipment in conjunction with forming gas passage.

Useful is, the complete sealing device of nozzle comprises the device that combines with the spray equipment inner surface, is used for eliminating the pressure reduction between gas passage and the coating passage, goes in the coating to prevent that gas from leaking into.

The nozzle of using on a selective basis has partly that outer surface is non-circular at least, is used for and the corresponding shape of spray equipment inner surface partly cooperates, and when preventing to pack nozzle into this spray equipment, nozzle rotates.

Nozzle passage front end portion within it is tapered into tiny outlet from one, and tapering is the 5-8 degree.Another kind of mode is, makes this section passage become stepped, or it is tapered and becomes stepped, and to the last tapering is little of zero degree.Preferably passage can extend axially in whole length of nozzle, with the passage coaxial line nozzle needle is housed.

During use, preferably nozzle is positioned on to have and combines, on the Gad dynamic coating apparatus of retractible plunger with nozzle needle.Plunger utilizes spring to get back to resting position, at this moment promotes nozzle needle and is connected with nozzle and reaches sealing.For control more accurately, need control the initial movable of nozzle needle to greatest extent well.

In five-star commodity spray gun, only utilize a functional unit that " two yuan of independent control " of air and coating is provided.Depress functional unit, improve air mass flow, immediately along the direction of perpendicular, normally rearward move simultaneously, the coating flow is controlled in the withdrawal of control nozzle needle whereby.

Fig. 2 in the accompanying drawing is the air of spray gun in the prior art and the partial schematic diagram of coating (nozzle needle) control device.

Hand-control device comprises button 14.Promote button 14 downwards, drive pivoted coupled connecting rod 15, open the air valve (not shown) whereby gradually.Connecting rod slides in the perforate of rifle body 17, and push-piece stem 16 minutes is on nozzle needle 10.Rifle body 17 has fulcrum 18, and control lever 19 can rotate around this axle.Control lever 19 and needle stand 20 engagements are slidably engaged to front curve and push-piece stem 16 formation then.Push-piece stem 16 pivoted motion along clockwise direction (as shown in the figure) drives control lever 19 and rotates around its fulcrum, promotes needle stand 20 simultaneously and shifts nozzle needle 10 onto the right, makes whereby in the nozzle needle withdrawal nozzle (not shown), with distribution coating.This device form constitutes about 1: 4 interlock, and moving with the motion of button 14 of nozzle needle 10 is linear basically.This motion mode can not reach the effect of the required initial movable of accurate control above-mentioned.

Control device described below (being the subject matter of the relevant therewith application of the portion applied for simultaneously with the present invention) can accurately be controlled the initial movable of nozzle needle.

By embodiment, with reference to Fig. 3 in the accompanying drawing-18, further describe the present invention.

Fig. 3 is a kind of side view of the spray gun that forms according to qualifications, and this spray gun contains the nozzle with feature of the present invention.

It is respectively along a-a that Fig. 3 a, 3b, 3c illustrate, b-b, c-c, the spray gun cross-sectional view of line.

Fig. 4 be coatings tank a kind of side installation form and with Fig. 3 in the cross-sectional view of connected mode of spray gun.

Fig. 5 is the schematic diagram that the aspirator of coating is provided to spray gun under normal pressure.

Fig. 6 is the part figure of nozzle of the present invention and tip portion.

Fig. 6 a-6h illustrates the various variations to version proposed among Fig. 6.

Fig. 7 is the profilograph of the nozzle-end of spray gun, and what illustrate is a kind of preferred nozzle.

Fig. 7 a and 7b are respectively along 7a-7a among Fig. 7, the profile that the 7b-7b line is cut open.

Fig. 8 is the longitdinal cross-section diagram corresponding to Fig. 7 part, but nozzle needle and control plunger thereof also only are shown.

Fig. 9 and Figure 10 are other variations of nozzle needle shown in Figure 8.

Figure 10 a is a kind of variation of nozzle needle head, can be used on the nozzle needle of any form described herein.

Figure 11 illustrates the nozzle of spray gun and a kind of variation of airhood.

Figure 12 is the profile of cutting open along 12-12 line among Figure 11.

Figure 13 illustrates the mode that makes nozzle needle control plunger seal in a kind of gun body.

Figure 14 is the schematic diagram that control member reaches the mechanical device that links to each other.

Figure 14 a is the perspective view of control member shown in Figure 14.

Figure 14 b and Figure 14 c are the voltage biasing structure form schematic diagrames according to qualifications of control member among Figure 14.

Figure 15 is the nozzle needle and the gas control mechanical device schematic diagram of another kind of pneumatically control.

Figure 16 is the direct hand-control device schematic diagram that is used for controlling air-flow.

Figure 17 is the schematic representation of apparatus of another control air-flow.

Figure 18 is the partial schematic diagram of a kind of variation of gas control device shown in Figure 17.

As shown in Figure 3, the spray gun itself that nozzle of the present invention is housed is exactly new shape.Spray gun comprises rifle body 22, is preferably formed by lightweight, high-intensity plastic material mold pressing.Rifle body 22 is symmetrical in vertical vertical midplane, and as Fig. 3 a, 3b is shown in the schematic diagram of 3c middle section.Be equipped with on the rifle body 22 nozzle and nozzle needle sub-assembly (hereinafter will illustrate) are arranged on airhood 23 on the rifle body, control enters the air of nozzle and the control member 24 of coating, be used for fixing (Fig. 4) horizontal clear opening 25 of coatings tank 26, or fixing one or several linings when using pressurized coating, and air or air and coating connector 27, utilize this connector, air or air and coating to be sprayed are sent into spray gun through one or several tube connector 28.Connector 27 and on the jack of tube connector 28 can be coaxial or be arranged side by side.Be connected the screw member that comprises two relatively turnable axial drillings between air pipe line and the spray gun, accompany soft elasticity 0-shape ring between the member, when external thread piece was screwed into female member, 0-shape annular strain tightly clogged axial passage.In this way, choke valve is contained in the air pipe line, can in advance air stream be transferred to maximum.But, designed and make air pipe line tube connector 28 at least, fastened the formula pipe joint, be connected with spray gun as inserting by certain quick release type pipe joint.Above-mentioned assembling form is provided in the middle of such pipe joint.

If the used coating of spray gun is contained in the groove of installing the side 26, this troughed belt has the conveying pipeline 29 of extend radially, and 30 places sealing endways is shaped, so that coating is drawn from bottom land 26.Pipe 29 has a hole 31 at adjacent end 30 places, and when on demand when any end inserts clear opening 25, this hole and rifle body 22 interior axial coating passages 32 are communicated with.

Want depended on pressure input spray gun as coating to be sprayed, preferably the pressure with coating in the spray gun keeps constant.Fig. 5 illustrates the aspirator of coating under the constant voltage, and what wherein pump 33(drew here is self priming pump, but the also pump of available other types) formula feed pipe 34 and pipe 28 are sent into spray gun after filtration from storage tank 35 with stand-by coating.Coating is admitted to nozzle 12(diagram), coating is got back to storage tank 35 by constant pressure valve 36 through feed back pipe 37.

If pump 33 is self priming pumps, load onto certain in addition and make the inoperative device of automatic suction better, because when storage tank does not have material, might air be sucked spray gun by managing 28.If used pump is not a self priming pump, the size design of pump must should be made in its less container of can packing into.

Constant pressure valve 36 preferably is contained in the spray gun, so that it can be worked under the condition identical with the discharge pressure of the coating of input nozzle.Constant pressure valve comprises flat board 38, is fixed with thin layer of soft film 39 around the plate, so that form the coating passage between film and flat board.Film 39 is as the artificial surfaces layer, as long as the pressure of residue coating on film 39 is equal to or greater than environmental pressure, residue coating will pass valve.

From the coating of the axle seepage of pump 33, can get back to storage tank 35 through feed back pipe 37.

Referring now to Fig. 6-13, the new feature and the airhood 13 of nozzle needle 10 of the present invention, nozzle 12 described.Nozzle 12 is that it is good to have dimensional stability by the integral die spare of the time of its injection shaping of the anti-dielectric corrosion that it may be run into, and fatigue durability is strong, and the big character of intensity of protracting fractures.The preferred material that is used for nozzle is an acetal resin, as the copolymerization or the homopolymers of polyformaldehyde.For any elongation in these materials, yield point is all more than 7% elongation.The yield point of other appropriate materials is between the 5%-10% elongation.With the nozzle needle co-operation time, have a mind to make nozzle to be in stress.In order to make full use of the resilience of plastic material, had better not surpass yield point.But well-known, even the stressed yield point that surpasses of some plastic material still keeps most resilience,, just can recover its shape as long as simply be heated.Some plastic material if handle through plastic pre-strain, promptly is stretched to more than the yield point, and possible result of use is better.Nozzle needle is pressed into jet expansion can accomplishes this point.

According to the requirement of using spray gun, nozzle needle 10 can be a plastic material, or metal such as stainless steel or tungsten, perhaps coated or plate tungsten, platinum or gold, and perhaps the via nitride method is handled the surface characteristic to obtain suiting.The front end of nozzle 12 is outlets of a frusto-conical, when nozzle needle is in resting position, with exit seal, to prevent that coating is from coating flow channel 40 outflows of annular basically.Concerning spray gun, the size of jet expansion and nozzle needle tip is superfine little, and this is in order to say clearly, to amplify, and a bit exaggerative.Nozzle needle 10 has a tip that becomes taper, in tip point tapering maximum, and reduces (in 1-6 degree scope) gradually to the zone that itself and nozzle form sealing.In this zone, the diameter of nozzle needle point 11 is only big slightly as 0.2mm than jet expansion diameter.Nozzle engages with nozzle needle, and when nozzle needle shifted out the position that forms sealing slightly, nozzle was promptly expanded.When the shrinkage (being caused by its resilience) of the plastic material of and nozzle little owing to its tapering when nozzle needle is withdrawn (being to shift to the right in the drawings), because nozzle needle moves greatly, change coating content to be sprayed, thereby control distribution effectively by the coating of circular passage 40 between nozzle and the nozzle needle.

During use,, formed circular passage by air stream with nozzle 12 substantially concentric being contained in the airhood 13.The frusto-conical of nozzle 12 has a circular table 42, can cause negative pressure, and coating from the nozzle sucking-off, is strengthened the turbulent flow of air stream simultaneously.Fillet coating is detained between the angle between nozzle needle and the table top.The turbulence of air-flow makes from the atomizing of the coating of stagnant area and nozzle needle, suction airstream around the tip 11 of nozzle needle 10.Table top can be designed to different shape, strengthens or weaken the atomizing or the sucking-off of coating.For example, illustrated table top 42 meets at right angles with the axis of nozzle basically.Also can adopt the shape of arc constant-radius or the indefinite protruding or face that concaves, or constitute by the inclined-plane of tapering greater than the remaining tapered slope tapering of truncated cone.

According to the principle of the invention and the general introduction relevant, can adopt various combinations between nozzle needle and nozzle or nozzle and the airhood, to reach special-effect with Fig. 6.Partial schematic diagram by Fig. 6 a-6h illustrates these combinations.

Fig. 6 a illustrates nozzle 12 three different male-tapered zones.First regional 12a, the inside is a quite wide coating passage, connects tail with the interior shoulder 13a of steeply inclined.Second area 12b is than first area steeply inclined more, and axially departs from interior shoulder, to reinforce the tip region of nozzle.The tapering of the 3rd regional 12c only is a bit larger tham the gradient of jet expansion the inside, so that the jet expansion tip has necessary extension.Can see that airhood 13 has corresponding shape,, cause the necessary suction of sucking-off coating to constitute air duct.Figure 12 d place also illustrates some stripeds, and the inner surface of expression nozzle needle surface and/or nozzle tip is the rough surface of annular.Can see that the tip that nozzle needle stretches out is level and smooth, this is to assemble on needle point for fear of coating.The internal taper of jet expansion and the external taper of needle point can be very big, still kept aforesaid stretch nozzle simultaneously, then the characteristic of restoring with the syringe needle withdrawal.

Nozzle head among Fig. 6 b is similar to the nozzle shown in Fig. 6 a.Just the external taper of nozzle inner surface and nozzle needle is littler.The nozzle head inner surface can be done more coarsely.The start-up portion of this laminar surface that contacts with nozzle needle has axially or spiral groove, can control the coating flow preferably, can distribute by requirement control coating of the present invention simultaneously.The internal taper that in addition can the selected nozzle of conversion and the tapering of nozzle needle form wedge shape coating passage when making the nozzle needle withdrawal.The angle of wedgy passage will be surrounded the particle size range of pigmented coating to be sprayed.

Fig. 6 c, 6d, 6e are illustrated in the difformity that scope of the invention inner nozzle tip can be taked.Concentrate for the coating that makes spraying, the nozzle needle tip will stretch out from nozzle head, and this point is very important.Stretch out to such an extent that long meeting reduces nebulization efficiency, the too short focussing force that prevents to spray hachure that then weakens.Remember still the nozzle needle tapering to be strengthened, for example 12 degree, (a bit exaggerative) as shown in the figure.In order to make coating reach preferably atomizing effect and coating to be concentrated, preferably make the nozzle head end sharply fall in (Fig. 6 c), nozzle head is not held platform (Fig. 6 d and 6e), or makes the nozzle needle head be stairstepping cone shape (Fig. 6 e).

Nozzle shown in Fig. 6 f/nozzle needle combination is another form preferably of the present invention.If the table top on the nozzle 42 is level and smooth convex inclined-planes, be with or without ladder, can only hold fillet coating seldom in the angle.Even air velocity is when very slow, and get rid of big possibility of dripping coating from this stagnant area also minimum, because the dope layer of stagnant area is thick inadequately.

Fig. 6 g and 6h illustrate collaborative situation between the airhood 13 of nozzle head and coaxial assembling, have improved the flow regime of air-flow around the nozzle needle head.Invented under low-flow pressure, effectively atomised coating.

As shown in Figure 7, airhood 13 is fixed on nozzle 12 on the spray gun rifle body 22.Airhood is screwed in the hickey of spray gun front end by screw.Airhood 13 has a ring sleeve 43, can seal neatly to insert in the hole 44 that size is suitable on the rifle body 22.In inside, airhood 13 is processed into the shape that can hold conical butt nozzle 12, and with nozzle 12 be formed on the surface of nozzle 12 and/or airhood 13 inside narrow air duct 45(Fig. 7 a).In order to improve air velocity, air duct 45 can have the trapezoid cross section.

Nozzle 12 has the central cylinder 46 of a sky, the cylinder front end in the form of a truncated cone, tail end has a hollow taper bush 47.Lining 47 is pressed into the similar conical socket 48 on the rifle body 22.Ventilation ring 49 is positioned at lining 47(Fig. 7 b) or groove 48(Fig. 7) the surface, passage 50 leads to rifle body 22 outsides from ventilation ring 49.(not shown) in another embodiment, lining 47 has the stairstepping table top, and is similar to groove 48 shapes, one of them ladder as and the identical ring-shaped ventilation ring of ring 49 effects, and be communicated with passage 50.

Air enters the space between the ring sleeve 43 of the central cylinder 46 of nozzle 12 and airhood 13 through the passage 51 on the rifle body 22, and after air duct 45 enters the air outlet slit that the taper by airhood 13 and nozzle 12 partly forms.

Nozzle 12 has first diametric hole 52, extends to contiguous frusto-conically shaped portion from afterbody, also has second less hole 53 of diameter that front end is tapered, and tapering (in this embodiment) scope is the 5-8 degree.Nozzle needle 10 is contained in these holes, as shown in Figure 8.Spring 54 is around nozzle needle.But coated one deck antitack agent on spring 54 or the nozzle needle 10, in order to avoid bonding, but spring preferably floats, not the surface of the inner surface of contact hole 52 and nozzle needle handle 55.Spring 54 is connected its front end and leans against by on the shoulder that vary in diameter forms between first and second holes 52 and 53.A trapezoidal or taper shoulder 56 is but preferably arranged, so that install and fix the front end of spring 56 in this position.The head 57 of the other end of spring and nozzle needle 10 is joined and compress, so that nozzle needle is offset to the right, (as shown in the figure).With spring nozzle needle is fixed in the hole, also helps to make the nozzle needle centring.

The head 57 of nozzle needle has an automatic hollow recess 58, and the end 59 of control plunger 60 is housed in the groove.Head 57 except nozzle needle is centered, can be used to also prevent that nozzle needle from installing offside in the hole in the hole.According to the present invention, the nozzle arrangements made from plastic material provides one section nondestructive sealing station for nozzle needle at jet expansion.In most embodiments, syringe needle, the especially improved syringe needle shown in Figure 10 a, even the needle point tapering also guarantees can not cross this fragment position very suddenly, simultaneously, plunger and nozzle needle synergy is limited in the sealing station of nozzle needle on the centre position of this fragment position.The flow channel of coating to be sprayed is walked around the head 57 of nozzle needle from feeding-passage 32, passes first and second diametric hole of nozzle, extends to most advanced and sophisticated 11 places of nozzle needle.

Plunger 60 can seal in the rifle body by the ring sleeve 61 of the control that is stressed, as shown in Figure 8.Perhaps, as shown in figure 13, with comprising screw rod 62, spring 63, packing ring 64 and encapsulant 65 as the packing case of teflin tape with plunger seal in rifle body 22, prevent to enter coating.(not shown) in another embodiment, with diaphragm with plunger seal in the rifle body, avoid the surface to slide whereby.

As shown in Figure 9, in the nozzle needle 10 pre-compressed spring 66 can be housed, spring is fixed on the nozzle needle handle 55 by packing ring 67 and sealing device 68, guarantees to make the skew of nozzle needle and the insertion degree of nozzle needle 10 insertion nozzles 12 to have nothing to do.

Perhaps, as shown in figure 10, stretching spring 69 is fixed on the nozzle needle handle 55, or its reduced diameter portion branch is fixed on nozzle needle handle shoulder place, and the other end is fixed on fillet portion 70 places of nozzle 12, and it can make nozzle needle be offset to retracted position.Extension spring 69 preferably has higher initial tensile force.

Figure 11 is illustrated in the another kind of mode of fixed nozzle 12 on the airhood 13.In this embodiment, nozzle has a frusto-conical portion backward, the first diameter circle cylinder 71 and the second diameter circle cylinder 72.In two cylinders any or both are stationary fits in the respective aperture part of airhood 13.Narrow air duct 73 is positioned on the periphery of nozzle 12 or the respective aperture part surface of airhood 13 vertically.

(not shown) in another embodiment, the nozzle spiral is screwed in (preferably left hand thread) airhood, to prevent that nozzle from rotating with respect to airhood or other moves.Adopted with seal cartridge shown in Figure 7 47 similarly in this embodiment, but allowed to do limited axially movable sealing.This assembling can accurately be fixed on nozzle needle in nozzle and the airhood.Airhood is screwed into or otherwise is fixed on the gun body, limits the end portion of nozzle needle.It is non-circular to prevent that another kind of method that nozzle rotates in airhood from being that the cylinder of nozzle or cone are partly with, as polygonal cross section.Airhood inner surface with matching is processed into corresponding shape, and air duct 45 as previously mentioned, is positioned on the surface of nozzle or airhood.

Figure 14 and 14a illustrate adoptable another form in the spray gun.The front is mentioned, when the minimum coating of spraying, need control to greatest extent by controller.Preferably by moving that the process of control member 24 is amplified, drive the initial movable of nozzle needle, that is, moving of nozzle needle should be certain mobile transfer function of control member 24.For example, when control member 24 was done movement in a curve, the quadratic relationship that makes nozzle needle 12 comply with movement in a curve moved, and the initial movable of nozzle needle is comply with this relation at least.

Shown in Figure 14 and 14a, control member 24 comprises control lever 74, and this control lever is by pivot link 75,76, outstanding otch 77 places that are connected on the spray gun rifle body 22.The plunger 60 of control nozzle needle is installed on the rifle body 22 slidably, and by with the bar 79 of plunger 60 pivots dresses on spring 78 push the left side (as shown in figure 14) to, promote nozzle needle and shift to sealing station in the nozzle.

Bar 79 is also pivotally connected with outstanding connective pole 75 usefulness, and connecting rod 75 is pivotally connected with an edge of the gripper shoe 80 of supporting control bar 74 again.At another edge of gripper shoe 80, connecting rod 76 pivotally is connected gripper shoe 80 with the adjustable brake 81 that is formed by the retainer nut 84 who does not rotate on the spray gun rifle body.Brake 81 limits static (sealing) position of nozzle needle 10.Can push control lever 74(and see Fig. 2 and Figure 15) the control air valve (not shown).

Because the mobile circular passage that is not enough to open between needle point 11 and the nozzle 12 of consequent nozzle needle, so such distribution of moving coating does not almost influence.But in case of necessity, if with the resting position of retainer nut's 84 preset nozzle needles, can effectively utilize this of nozzle needle and move, pushing control lever 74 just can be predetermined the distribution of coating.On the other hand, provide certain empty moving form, when avoiding pushing control lever 74, moved behind the plunger 60 and cause moving behind the nozzle needle.

If control lever 74 moves backward, it is outstanding to connect state and can guarantee to pass to plunger 60 by the motion that linked system will change, and plunger is moved to right, and as shown in the figure, and it is corresponding mobile that nozzle needle 10 is done under spring action.

Know that 75,76 on connecting rod is controlled by tensile force, so might use rope, line or analog to replace.

Figure 14 b and 14c illustrate the another kind of mode of bias voltage control member in the coating distributed process.Spring 78 be fixed on spray gun rifle body and connecting rod 79 ' arm on, connecting rod 79 ' an end can pivotally be connected with gun body, the other end be connected plunger 60 ' and connecting rod 75 ' between pivot on.This bias voltage assembling mode, can with the location independent of control member, working under the constant force state basically.Perhaps, by two similar spring actings in conjunction, so that constant force/unit extension to be provided.

Adopt servo mechanism as shown in figure 15, can carry out the initial control of nozzle needle 10 better.In this embodiment, by pneumatic control nozzle needle position.Generally supplying gas to spray gun is to utilize control lever 85, and pushing air valve 86 makes air enter through the rifle body that airhood controlled.Control member 85 is contained on the push rod of parallelogram linkage device, and lower beam comprises that leaf spring 87, two side levers comprise leaf spring.But control lever 85 is shifted to the right (as shown in the figure) with the opposite level of spring skew.

Air valve 86 is two-way valves, carries air to servo mechanism 88 simultaneously behind the valve open.Air is through choke valve, and its pressure is by breather valve 90 controls, and 90 of breather valves are controlled by moving horizontally of control lever.

Servo mechanism 88 comprises the gas receiver of being made by inextensible flexible material basically 91.But the relative two ends of gas receiver link to each other with the similar regulating brake 81 of plunger 60 and the narration relevant with 14a with Figure 14 respectively.Air enters gas receiver 91 under the pressure by breather valve 90 controls, make its inflation.Initial inflation only causes the minor alteration at gas receiver axial length (between the connected two ends).Further inflation causes the bigger change of axial length, and along with gas receiver 91 is full of fully, the change of axial length reaches maximum.In this way, can control move (the controlling feed then) of nozzle needle 10 effectively, to reach control more accurately.

According to another feature of spray gun described herein, can strengthen the control that the subtend nozzle is carried air.

With reference to Figure 16, a kind of very simple air shut-off valve is shown, wherein air is carried along the flexible pipe 92 that is fixed on by conduit 93 in the spray gun rifle body.Spring 94 is housed in the rifle body, upwards skew, as shown in the figure.Spring is contained in pipeline 92 bottoms of incision position in the conduit 93, by the skew of spring, flexible pipe is upwards pressed.By means of the corresponding motion of control lever 74 ' done, spring 94 is shifted out and flexible pipe 92 is thrown off downwards, control lever 74 ' the be similar to described control lever of Figure 14.

Figure 17 illustrates the another kind of mode of control air, wherein the control of air is depended on the instantaneous position of control member when controlling the coating flow again.Point out that in the explanation that the assembling form among Figure 14 is done control lever 74 moves down (as arrow indication among this figure) to improve air mass flow.The natural turned position of the arrow points connecting rod 75,80,76 that illustrates.In fact, wish that in the process of sprayed coating, the instantaneous position of control 74 can exert an influence to the control of air spouting velocity.In Figure 14, the contact position that this point can be by making control lever 74 is realized away from the physical slot after the rotatablely moving of connecting rod 75,80,76.

In Figure 17, the assembling mode that illustrates is: though adopted improved air valve, the member 80 of control lever 74 ' following ' be still connecting rod 75 ', 80 ', 76 ' a part.Here, member 80 ' with control lever 74 ' be an integral die spare, connect with the members 96 that are sleeved on second member 97 by mold pressing hinge joint 95 with integral form simultaneously.Member 97 extends through first sealing ring 98, enters and pass air chamber 99, with sealing ring 100 sockets of elastically deformable.Air enters air chamber 99 through path 10 1.Control lever 74 ' do corresponding moving downwards drives second member 97 and rotates near first sealing ring 98, makes sealing ring 100 distortion of elastically deformable, and air is input to the airhood of spray gun from overflowing here.Can know, during design on demand can with hinged 95 along connecting rod 75,80 ', 76 install, to reach the effect of improving air-distribution.Certainly,, in 16,17, the 18 described embodiments, also can adopt other assembling forms at Figure 14, wherein, can be along connecting rod, as the member among Figure 17 80 ' adjusting control point.(as, constitute by hinged 95 among Figure 17).

Figure 18 illustrates the improved air valve in the assembling form of a kind of Figure 17 of can be used on.In this embodiment, the member 102 of the similar piston (not shown) that is connected with control lever can pivotally or slidably be assembled together with sealing ring 103 simultaneously.One end of member 102 is sleeved in the bacterium head valve 104, pushes this valve to conical gasket 106 by spring 105.Rotatablely moving of member 102 removed valve 104 from sealing gasket 106, allow air through path 10 1 ' and air chamber 99 ' enter airhood (not shown) of spray gun.

In another conversion scheme of embodiment shown in Figure 180, valve 104 is a tack, and valve rod one end can pivotally be connected with a bar, and this bar is connected with piston 102 equally.This bar rotates, and drives the tack of valve, and air is passed through.

Specification has adopted " air " and " coating " two speech in full, is interpreted as available any relatively inert gasses, as freon, replaces air.Equally, adopting coating one speech only for for the purpose of oversimplifying, is well-known because spray water and non-water-base dye or pigment.

The present invention can be used for existing spray gun class, or other miniature spraying or spray equipments, or new spray gun class as shown in Figure 3.Should be appreciated that and to take the numerous variations mode, so can not think by any way that specification and accompanying drawing thereof are limitations of the present invention full content as herein described.

Claims (16)

1, the nozzle that is used for Gad dynamic coating apparatus, passage (40) for medium use to be sprayed is arranged, the outlet that this passage has a front end size to dwindle, seal with common formation of taper nozzle needle (10) that is contained in the passage during use, it is characterized in that: nozzle (12) is made by elastomeric material, when nozzle needle moves past sealing station, can be expanded a little, after the nozzle needle withdrawal, there are enough resiliences to recover original-shape again.

2, according to the nozzle of claim 1, make by the plastic material of anti-dielectric corrosion to be sprayed.

3, according to the nozzle of above-mentioned any one claim, be shaped by time of its injection.

4, according to claim 1,2 or 3 nozzle, have nozzle needle (10), its nozzle needle tapering increases towards needle point (11) direction.

5, according to the nozzle of claim 4, wherein nozzle needle is the 0-6 degree at the tapering in the sealed engagement zone of itself and jet expansion.

6, according to the nozzle of above-mentioned any one claim, wherein passage (40) inside is tapered to the outlet that size is dwindled, and tapering is less than 8 degree.

7, according to the nozzle of above-mentioned any one claim, wherein, passage (40,53,52) extends axially in the length range of nozzle, and nozzle needle is axially packed into wherein.

8,, install the substantially the same nozzle needle of installation length in advance on the nozzle in advance, as the air outlet slit place of the coaxial Gad dynamic coating apparatus of packing into of sub-assembly according to the nozzle of above-mentioned any one claim.

9, nozzle according to Claim 8, itself is with complete sealing device (43,47), is used for remaining in the spray equipment sealing between the air and medium channel.

10, according to Claim 8 or 9 nozzle, its outer surface has groove (45), is used for forming air duct jointly with the inner surface of spray equipment.

11, according to the nozzle of claim 9 and 10, sealing device wherein comprises, is used for inner surface acting in conjunction with spray equipment, to eliminate pressure differential between air duct and the medium channel, to prevent that air from infiltrating the device (49) of medium.

12, according to Claim 8 or its any nozzle that is subordinated to its claim, have a part of non-circular outer surfaces at least, be used for cooperating, prevent to rotate when nozzle from packing spray equipment into the corresponding a part of inner surface of shape on the spray equipment.

13, according to Claim 8 or its any nozzle that is subordinated to its claim, wherein the nozzle needle of sub-assembly has the device (57,58) that in nozzle it is centered, this centralizer is horizontally set with axle, and the nozzle tip nozzle needle is not produced or only apply very little active force.

14, according to Claim 8 or its any nozzle that is subordinated to its claim, in nozzle, also comprise spring assembly (54,66,69), be used for nozzle needle is pushed away sealing station.

15, according to the nozzle of claim 14, wherein spring assembly is precompressed, in the working range of spring, provides stronger starting force, and the power of substantial constant preferably then is provided, to guarantee making nozzle needle shift to retracted position easily smoothly.

16, according to Claim 8 or its any claim that is subordinated to it and claim 14 be contained in nozzle on the spray equipment, have a retractible plunger (60), can with the nozzle needle acting in conjunction, plunger is pushed resting position to by spring, drive nozzle needle and nozzle thus and form sealed engagement, in the nozzle, in plunger when withdrawal,, nozzle needle is withdrawn under himself spring action.

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