CN110841818B - Atomizing cup head and electrostatic rotary cup - Google Patents
Atomizing cup head and electrostatic rotary cup Download PDFInfo
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- CN110841818B CN110841818B CN201911089464.3A CN201911089464A CN110841818B CN 110841818 B CN110841818 B CN 110841818B CN 201911089464 A CN201911089464 A CN 201911089464A CN 110841818 B CN110841818 B CN 110841818B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/081—Plant for applying liquids or other fluent materials to objects specially adapted for treating particulate materials
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- Electrostatic Spraying Apparatus (AREA)
- Nozzles (AREA)
Abstract
The invention discloses an atomizing cup head and an electrostatic rotary cup, and belongs to the field of coating. Atomizing cup head includes: a cup body and a dispensing tray; the distribution disc is arranged in the cup body, and a liquid filling cavity is formed between the lower surface of the distribution disc and the inner wall of the cup body; the bottom of the cup body is provided with a first liquid channel communicated with the liquid filling cavity, and the center of the distribution plate is provided with a second liquid channel communicated with the liquid filling cavity; a gap is formed between the distribution disc and the inner wall of the cup body, so that when the cup body rotates and liquid enters the liquid filling cavity, one part of the liquid rises to the cup edge of the cup body through the gap, and the other part of the liquid rises to the cup edge of the cup body after flowing through the upper surface of the distribution disc through the second liquid channel; the cup edge of the cup body is provided with fine teeth which are used for cutting liquid; the curve of the inner wall of the cup body formed by rotation is an inverse trigonometric cosine function curve: y is arccos x, where y is the height of the cup and x is the width of the cup. The invention improves the spraying effect and quality.
Description
Technical Field
The invention relates to the field of coating, in particular to an atomizing cup head and an electrostatic rotary cup.
Background
When coating an automobile body, an electrostatic rotary cup is generally adopted for coating, a coated workpiece is grounded to serve as an anode, the electrostatic rotary cup is connected with negative electricity high voltage (0-100KV) to serve as a cathode, an atomizing cup head of the electrostatic rotary cup is driven by a motor to rotate at a high speed, after coating is conveyed to the electrostatic rotary cup, due to the fact that centrifugal force is generated by the high-speed rotation of the atomizing cup head of the electrostatic rotary cup, the coating forms a film on the inner wall of the atomizing cup head of the electrostatic rotary cup and moves towards the edge of the atomizing cup head, the film is cut and broken into charged coating particles through fine teeth on the edge of the atomizing cup head, and the charged coating particles move and are deposited on the surface of the coated workpiece.
The inner wall and the outer wall of the atomizing cup head provided by the related art are both conical.
The inventors found that the related art has at least the following problems:
because the inner wall of the cup head is conical, uneven waves, gullies or finger-shaped flow marks are formed on the inner wall of the coating, so that the atomization capability of the fine teeth on the edge of the cup head on the waves, gullies or finger-shaped flow marks is weakened, the final atomized particle size distribution range of the cup head is wider, and a certain amount of large-particle coating is contained in a coating film to influence the coating effect.
Disclosure of Invention
The embodiment of the invention provides an atomizing cup head and an electrostatic rotary cup, which can solve the technical problems. The technical scheme is as follows:
in one aspect, an atomizing cup is provided, comprising: a cup body and a dispensing tray;
the distribution disc is arranged in the cup body, and a liquid filling cavity is formed between the lower surface of the distribution disc and the inner wall of the cup body;
the bottom of the cup body is provided with a first liquid channel communicated with the liquid filling cavity, and the center of the distribution plate is provided with a second liquid channel communicated with the liquid filling cavity;
a gap is formed between the distribution plate and the inner wall of the cup body, so that when the cup body rotates and liquid enters the liquid filling cavity, one part of the liquid rises to the cup edge of the cup body through the gap, and the other part of the liquid rises to the cup edge of the cup body after flowing through the upper surface of the distribution plate through the second liquid channel;
the cup edge of the cup body is provided with serrations for cutting the liquid;
the curve of the inner wall of the cup body formed by rotation is an inverse trigonometric cosine function curve: y is arccos x, where y is the height of the cup and x is the width of the cup.
In a possible implementation, the gap between the distribution plate and the inner wall of the cup body is smaller than the cross-sectional area of the liquid-filled chamber, through which the liquid can be accelerated as it rises to the rim of the cup body.
In a possible implementation manner, the cup edge of the cup body and the outer wall of the cup body are transited through a fillet, and the angle of the fillet is r0.1-r 1.
In a possible implementation manner, the lower end of the inner wall of the cup body extends inwards to form a platform, the distribution disc is located above the platform, a liquid filling cavity is formed between the lower surface of the distribution disc and the platform, a cup wall extending to the lower side of the platform forms an annular wall, a base is formed below the platform, and a groove is formed between the annular wall and the base.
In a possible implementation manner, the base comprises a transition part and an extension part which are sequentially connected from top to bottom, and the first liquid channel is arranged on the transition part.
In one possible implementation, the first liquid channel includes: the reducing section and the diameter section that from top to bottom communicate in order, the diameter of reducing section from top to bottom reduces gradually, the diameter of diameter section is unchangeable, the reducing section with liquid filling chamber intercommunication, the extension is hollow structure, the diameter section with the extension intercommunication, the diameter of extension is greater than the diameter of diameter section, the extension be used for with scavenge pipe or coating union coupling.
In a possible implementation manner, a plurality of cleaning holes are formed in one end, connected with the transition portion, of the extending portion in the circumferential direction, the cleaning holes are communicated with the groove, and after the cleaning pipe is connected with the extending portion, part of cleaning liquid enters the groove from the cleaning holes to clean the groove.
In a possible realization mode, the included angle between the generatrices of the sections of the outer walls of the cup bodies along the same axis is 45-120 degrees.
In one possible implementation, the cup head further includes: a connecting member;
the lower surface of the distribution disc is provided with a first connecting hole, the transition part is provided with a second connecting hole, and the connecting piece is connected with the distribution disc and the bottom of the cup body through the first connecting hole and the second connecting hole.
In another aspect, an electrostatic rotary cup is provided, which comprises the atomizing cup head.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the cup head provided by the embodiment of the invention, the coating is conveyed to the first liquid channel at the bottom of the cup body and flows to the liquid filling cavity formed by the lower surface of the distribution plate and the bottom of the cup body through the first liquid channel, one part of the coating is distributed to the cup edge of the cup body through the lower surface of the distribution plate, the other part of the coating flows to the upper surface of the distribution plate through the second liquid channel on the distribution plate and is distributed to the cup edge of the cup body through the upper surface of the distribution plate, and the liquid is cut through the fine teeth on the cup edge. The curve of the inner wall of the cup body provided by the embodiment of the invention is an inverse triangular cosine function, so that a paint film formed by cutting the paint is uniform on the inner wall of the cup body, waves, gullies and finger-shaped flows are eliminated, the paint film is distributed and concentrated, and the spraying effect and quality are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an atomizing cup head provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an effect of a coated cup head provided by a related art according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of related art cup atomization using a linear inner wall of the cup according to an embodiment of the present invention;
FIG. 4 is a graph illustrating a steepest curve as a cup head curve according to a related art provided by an embodiment of the present invention;
FIG. 5 is a graph illustrating a logarithmic curve and a straight line as a cup head curve according to the related art provided by the embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an effect of a coated cup head using an inverse trigonometric cosine function as a cup head curve according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of cup atomization when an inverse trigonometric cosine function is applied to an inner wall of a cup according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an atomizing cup head provided in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an atomizing cup head provided in the embodiment of the present invention.
The reference numerals denote:
1-cup, 2-dispensing tray, 101-liquid-filled cavity, 102-first liquid channel, 1021-tapered section, 1022-diameter section, 103-second liquid channel, 104-groove, 105-cleaning hole, 11-rim, 12-body, 13-bottom, 3-base, 31-transition, 32-extension, 4-connector.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The electrostatic painting process originated in the early 50 s of the 20 th century, and the high-speed electrostatic rotary cup painting has become a main tool for automobile body painting, both from the viewpoint of improving product quality and production efficiency, and from the viewpoint of saving paint and reducing environmental pollution, and has also been increasingly widely used in general industrial painting.
The coating principle of the high-speed electrostatic rotary cup is that a workpiece to be coated is grounded as an anode, the electrostatic rotary cup is connected with negative electricity high voltage (0-100KV) as a cathode, the electrostatic rotary cup is driven by a high-speed turbine motor, when a coating is sent to a cup head rotating at a high speed, the coating forms a film on the inner wall of the cup head due to the centrifugal force generated by the high-speed rotation of an atomizing cup head, and the coating moves towards the edge of the cup head with great acceleration. Because of the double functions of static electricity and centrifugal atomization, the static electricity rotary cup coating has the advantages of manpower saving, uniform and stable coating quality, coating saving and the like.
The inner wall and the outer wall of the cup head of the traditional electrostatic spinning cup generally take a cone shape as a main part, paint is distributed to the inner wall of the cup head by the distribution plate 2, and then a liquid film is formed on the inner wall of the cup head under the action of centrifugal force. The paint is generally composed of pigments, resin, solvent, additives and the like, wherein the pigments are divided into mineral pigments and organic pigments, the additives sometimes contain metal particles, the resin has high viscosity, and the paint is a mixture composed of multiple components and belongs to non-Newtonian fluid. If the inner wall is tapered, the paint may form uneven waves, gullies or finger-like flow marks in the inner wall of the cup head. After the waves, ravines or finger-shaped flow marks reach the edge of the cup head, the fine atomization effect of the edge of the cup head is weakened, the height of some finger-shaped flows even exceeds the depth of the fine teeth, and part of paint is directly thrown off the cup head in a sheet shape. The atomized average particle size of the coating portion cut into filaments is finer than the atomized particle size of the flaked paint. Therefore, the existence of uneven films such as waves, ravines or finger-shaped flows causes the final atomized particle size distribution range of the cup head to be wider, the paint mist contains a certain amount of large particles, and the existence of the large particles often affects the coating quality. In view of this, an embodiment of the present invention provides an atomizing cup head, which solves the above technical problems.
In one aspect, an embodiment of the present invention provides an atomizing cup, as shown in fig. 1, the atomizing cup includes: a cup body 1 and a distribution plate 2;
the distribution plate 2 is arranged in the cup body 1, and a liquid filling cavity 101 is formed between the lower surface of the distribution plate 2 and the inner wall of the cup body 1;
the bottom of the cup body 1 has a first liquid passage 102 communicating with the liquid-filled chamber 101, and the center of the distribution plate 2 has a second liquid passage 103 communicating with the liquid-filled chamber 101;
a gap is formed between the distribution plate 2 and the inner wall of the cup body 1, so that when the cup body 1 rotates and liquid enters the liquid filling cavity 101, one part of the liquid rises to the cup edge 11 of the cup body 1 through the gap, and the other part of the liquid rises to the cup edge 11 of the cup body 1 after flowing through the upper surface of the distribution plate 2 through the second liquid channel 103;
the cup edge 11 of the cup body 1 is provided with fine teeth which are used for cutting liquid;
the curve of the inner wall of the cup body 1 formed by rotation is an inverse trigonometric cosine function curve: y is arccos x, where y is the height of the cup 1 and x is the width of the cup 1.
The device provided by the embodiment of the invention at least has the following technical effects:
according to the cup head provided by the embodiment of the invention, the coating is conveyed to the first liquid channel 102 at the bottom of the cup body 1, flows into the liquid filling cavity 101 formed by the lower surface of the distribution plate 2 and the bottom of the cup body 1 through the first liquid channel 102, one part of the coating is distributed to the cup edge 11 of the cup body 1 through the liquid filling cavity 101, the other part of the coating flows to the upper surface of the distribution plate 2 through the second liquid channel 103 on the distribution plate 2, is distributed to the cup edge 11 of the cup body 1 through the upper surface of the distribution plate 2, and the liquid is cut through the fine teeth on the cup edge 11. The curve of the inner wall of the cup body 1 provided by the embodiment of the invention is an inverse triangular cosine function, so that paint films obtained after the paint is cut are respectively uniform on the inner wall of the cup body 1, waves, gullies and finger-shaped flows are eliminated, the paint films are distributed and concentrated, and the spraying effect and quality are improved. And the cup head has higher atomization capability under the condition of not changing other conditions by selecting the inner wall curve of the inverse triangular cosine function, so that the cup head is more suitable for coating of a larger-flow coating and keeps a good spraying effect during coating.
Most of the curves of the inner wall of the cup head commonly used in the related technology are straight lines, but due to the complex composition of the coating, the components of the coating contain insoluble substances, and the viscosity of the coating is high, irregular jet flow is often formed on the inner wall of the cup head during actual coating, and jet flow marks are formed on the inner wall of the cup head. If the coating viscosity is low, waves, ravines or microscopic finger-like flows may form. In order to make the liquid film on the inner wall of the cup head uniform, the application respectively uses a logarithmic curve, an inverse trigonometric function curve, a steepest curve and the like to respectively carry out testing. The actual atomization distribution and atomization effect of different types of coatings are tested, and a high-speed camera photographs and samples the coatings to obtain the atomization effect of the coatings atomized by the cup heads with different inner wall curves.
In the embodiment of the invention, the coating effect of the inner wall of the cup head adopting a straight line is photographed and observed by a high-speed camera, referring to fig. 2, the fact that a great amount of finger-shaped coatings are accumulated on the inner wall of the cup head is found, a great amount of uneven waves and gullies are found at the bottom of the inner wall, the coatings are distributed radially from the center, and the coatings are extremely unevenly distributed on the inner wall of the cup head.
Fig. 3 is a schematic diagram of atomization of a cup head when a linear inner wall of the cup head is adopted in the related art. As can be seen from figure 3, the finger-shaped flow on the inner wall of the cup head sometimes exists in a granular shape and sometimes exists in a wave shape, because the amount of the coating is different when the wave crests and the wave troughs reach the edge of the cup head, the wave crests are higher than the cutting teeth on the edge of the cup head in many times, part of the coating of the wave crests directly passes over the cutting teeth to be thrown out of the cup head, and the atomized particles of the part of the coating are thick and large, so that certain influence can be caused on the coating quality.
Through experiments, when the curve of the inner wall of the cup head adopts a straight line, the coating is uniformly distributed on the distribution disc 2 by the separating cone on the lower surface of the distribution disc 2, wherein about 70% of the coating is ejected from the edge of the distribution disc 2 through the lower surface of the distribution disc 2. About 30% of the coating material is thrown off the second liquid passage 103, flows over the upper surface of the distribution plate 2, and is then ejected from the upper surface of the distribution plate 2. After the two jet surfaces simultaneously irradiate the inner wall of the cup head, the two jet surfaces are thrown out of the inner wall of the cup head under the action of centrifugal force for atomization.
Referring to FIG. 4, which is a schematic diagram of the cup head curve using the equation for the steepest curve, as shown in FIG. 4, the particle starts moving from point O, and its velocity v is related to its ordinate y by:
wherein alpha is an acceleration, and the acceleration alpha is mainly an acceleration generated by a centrifugal force when the paint moves
Where r is the radius of the distribution plate 2 and w is the angular velocity of the distribution plate 2.
The arc differential is:
speed at some point x, y on the curve:
the time from the origin O to point a is found:
finally, the equation of the shortest curve in time from the origin O to the point a can be obtained.
If the curve of the inner wall of the cup head adopts the steepest curve, t is shortest when a certain specific coating particle reaches the edge of the cup head from the bottom of the inner wall of the cup head, but the total length s of the curve of the inner wall of the cup head is unchanged, so that the thickness of a liquid film of the coating on the inner wall of the cup head is thinnest when the steepest curve is adopted under the condition that the total flow of the coating is unchanged, and the maximum allowable use flow of the cup head is larger than that when other curves of the inner wall are adopted. Such an internal curve is suitable for cases where the paint flow is high, but the requirements on the paint quality are not particularly high, for example, primer painting in the general industry or intercoat painting in a full-vehicle paint. Experiments show that the problem of waves and gullies can be solved to a certain extent by adopting the fastest curve, but the sprayed interface is photographed by a high-speed camera, and the existence of finger-shaped flow is still found to influence the smoothness and the spraying effect of the sprayed surface.
Fig. 5 includes a common cup head inner wall curve y ═ kx. Under the huge centrifugal force, because the paint comprises the pigment and the additive particles, and the kinetic energy obtained by the pigment particles and the additive particles is different from the kinetic energy obtained by other liquid components in the paint, the cup head adopting the curve inner wall can generate a serious paint separation phenomenon when rotating at a high speed, and a large amount of wave and finger-shaped flow is found by taking a picture of a sprayed workpiece through a high-speed camera.
Referring to the logarithmic curve in fig. 5, the cup head with the inner wall of the logarithmic curve is adopted, the wave and the finger-shaped flow can be greatly reduced in the front half section of the curve, but a small amount of separation can occur in the rear half section of the curve, when the curve is used, the velocity component of paint particles in the axial direction is small, larger forming air is needed for good forming, and the velocity of paint atomized particles can be increased along with the increase of the forming air, so that the overspray amount is increased, and the transfer efficiency of the paint is reduced.
Fig. 6 and 7 are schematic diagrams of the embodiment of the invention when a cup head with an inner wall curve being an inverse trigonometric cosine function is used for atomization, and after spraying, a high-speed camera is used for photographing and observing a flow mark on the inner wall of the cup head, so that a paint film on the inner wall of the cup head is uniform and basically has no turbulent flow structures such as waves and finger-shaped flows, and the paint film uniformly extends from the center of the inner wall of the cup head to the edge. The separation of the coating particles is prevented by the change of the inner wall curve of the cup head, the liquid film and the liquid film on the inner wall of the cup head are cut uniformly, the distribution of the coating particle size is concentrated, and the coating effect is improved.
According to the embodiment of the invention, through simulation calculation and a large amount of experimental optimization, an optimal cup head inner wall curve, namely an inverse triangular cosine function curve provided by the embodiment of the invention, is fitted from a large amount of experimental data, and the optimized inner wall curve can greatly reduce the generation of wave, gully and finger-shaped fluid films, so that the coating forms a more uniform fluid film on the inner wall of the cup head, and after the uniform fluid film is cut by the fine teeth on the outer edge of the cup head, the distribution of the paint mist is more concentrated, and the size of the paint mist particles is more uniform.
In a possible implementation manner, as shown in fig. 8, the second liquid passage 103 provided in the embodiment of the present invention is smaller than the first liquid passage 102, and most of the paint is distributed to the rim 11 of the cup body 1 after contacting with the lower surface of the distribution plate 2 through the first liquid passage 102 when spraying, and since the second liquid passage 103 is smaller than the first liquid passage 102, a small portion of the paint can flow to the rim 11 of the cup body 1 through the second liquid passage 103, and in addition, when cleaning the cup head, the cleaning liquid can also flow to the upper surface of the distribution plate 2 through the second liquid passage 103 to clean the upper surface of the distribution plate 2.
In a possible realization, the space between the distribution plate 2 and the inner wall of the cup body 1 is smaller than the cross-sectional area of the liquid-filled cavity 101, through which the liquid can be accelerated as it rises to the rim 11 of the cup body 1.
It should be noted that by setting the thickness and diameter of the distribution plate 2, the gap between the distribution plate 2 and the inner wall of the cup body 1 can be adjusted, and the size of the cross-sectional area of the liquid-filled chamber 101 can be adjusted.
As an example, when it is desired that the gap between the distribution plate 2 and the inner wall of the cup body 1 is small, the diameter of the distribution plate 2 may be set to be large, and thus the gap between the distribution plate 2 and the inner wall of the cup body 1 is reduced.
When it is required that the cross-sectional area of the liquid-filled chamber 101 is small, the thickness of the distribution plate 2 may be set large so as to achieve a reduction in the cross-sectional area of the liquid-filled chamber 101.
According to the embodiment of the invention, the gap between the distribution plate 2 and the inner wall of the cup body 1 is smaller than the sectional area of the liquid filling cavity 101, so that the paint film formed after the paint is cut forms an emergent effect on the lower part of the inner wall of the cup body 1, the flowing speed of the paint film is increased, and the speed of the liquid film reaching the edge of the cup body 1 is correspondingly increased. And the higher centrifugal effect enables the cup head to have higher atomization capability. And when the paint is coated with the plain paint, the final coated paint film is more exquisite and plump. If the metal coating is coated, the regular arrangement of metal in an electrostatic field can be disturbed, and the reflective area of metal powder is increased, so that the final paint film has brighter color and higher glossiness. Through the structure of the distribution disc 2 and the cup body 1 provided by the embodiment of the invention, the cup head has higher atomization capability, and the atomization effect of the viscosity coating and the water-based coating is better.
In a possible implementation manner, the lower surface of the distribution plate 2 provided by the embodiment of the invention is provided with a separating cone along the central direction.
The coating is conveyed into the liquid filling cavity 101 through the coating pipe, the lower surface of the distribution disc 2 is provided with the conical liquid separating cone, the coating is uniformly distributed to the lower surface of the distribution disc 2 through the liquid separating cone, and the coating is thrown out from a gap between the disc edge of the distribution disc 2 and the inner wall of the cup body 1 through the liquid filling cavity 101 in the high-speed rotation of the distribution disc 2.
In one possible implementation, as shown in fig. 9, the brim 11 of the cup body 1 and the outer wall of the cup body 1 are in transition with a fillet having an angle r0.1-r 1.
As can be seen from the above, during coating, the coating is distributed on the inner wall of the cup body 1 and then cut by the serrations on the cup rim 11 to form charged coating particles, which are sprayed on the workpiece to be coated based on electrostatic action, so that the charged coating passes through the cup rim 11 of the cup body 1 when being sprayed on the workpiece to be coated. The outer edge angle of the cup head is formed by transition between the cup edge 11 of the cup head and the outer wall of the cup body 1 through a fillet.
It should be noted that too small outer edge angle of the cup head can form reverse vortex, too large outer edge angle of the cup head can change the direction of the forming air, and the fillet of the outer edge angle of the cup head is set between 0.1 and 1, so that the coating cannot form reverse vortex and cannot change the direction of the forming air. By way of example, it may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc.
It should be noted that, because the inner wall structure of the cup head and the structure of the cup rim 11 provided in the related art, the problem that the outer wall of the cup head is polluted after the cup head is sprayed for a long time is solved, the paint is thrown away from the edge of the cup head, a reverse vortex is formed on the upper edge of the paint mist, the reverse vortex drives the paint mist to spread towards the upper part of the outer surface of the rotary cup, and part of the paint is adsorbed on the outer surface of the cup head, so that the outer surface of the cup head is polluted. The burden of the turbine motor for driving the cup head to rotate can be increased on the one hand after the outer surface of the cup head is polluted, and on the other hand, if the paint coated on the outer wall of the cup head falls off after being dried, the paint can be adsorbed on a coated workpiece to form a coating defect, so that the coating effect is influenced.
By adopting the fillet design of the cup edge 11 provided by the embodiment of the invention, when the coating is thrown out through the cup edge 11, the coating is prevented from forming reverse vortex, and the coating is further prevented from being adsorbed on the outer wall of the cup body 1 to pollute the outer wall of the cup head. Further improving the coating efficiency.
In a possible implementation mode, the lower end of the inner wall of the cup body 1 extends inwards to form a platform, the distribution disc 2 is positioned above the platform, a liquid filling cavity 101 is formed between the lower surface of the distribution disc 2 and the platform, the cup wall extending to the lower part of the platform forms an annular wall, a base 3 is formed below the platform, and a groove 104 is formed between the annular wall and the base 3.
Referring to fig. 9, the cup body 1 provided by the embodiment of the invention is of a hollow structure, so that the weight of the cup head can be reduced, the load of a turbine motor for driving the cup head to rotate is reduced, and the turbine motor with the same power drives the same cup head to have higher atomization capability when spraying.
Since the cup head needs to be cleaned after coating, by providing the recess 104, the recess 104 can be cleaned by the cleaning liquid through the cleaning hole 105 without detaching the cup head during cleaning.
In one possible implementation, as shown in fig. 9, the base 3 includes a transition portion 31 and an extension portion 32 connected in series from top to bottom, and the first liquid channel 102 is disposed on the transition portion 31.
In one possible implementation, the first liquid channel 102 includes: reducing section 1021 and the diameter section 1022 that communicates in order from top to bottom, the diameter of reducing section 1021 reduces gradually from top to bottom, and the diameter of diameter section 1022 is unchangeable, and reducing section 1021 and liquid fill chamber 101 intercommunication, extension 32 are hollow structure, and diameter section 1022 and extension 32 intercommunication, the diameter of extension 32 are greater than the diameter of diameter section 1022, and extension 32 is used for being connected with scavenge pipe or coating pipe.
It should be noted that, after the cup head provided by the embodiment of the present invention is completely sprayed, the cup head needs to be cleaned, and when the cup head is cleaned, the cleaning pipe is connected to the diameter section 1022, most of the cleaning liquid enters the liquid filling cavity 101 through the diameter section 1022 and the diameter-changing section 1021, so as to clean the lower surface of the distribution plate 2, and clean the upper surface of the distribution plate 2 through the second liquid channel 103, so that the cleaning effect on the distribution plate 2 is improved.
In a possible implementation manner, as shown in fig. 9, one end of the extension portion 32 connected to the transition portion is provided with a plurality of cleaning holes 105 along a circumferential direction, the cleaning holes 105 are communicated with the groove 104, and after the cleaning pipe is connected to the extension portion, part of the cleaning liquid enters the groove 104 from the cleaning holes 105 to clean the groove 104.
Through setting up a plurality of cleaning holes 105 at the inner wall of extension 32 along the circumferencial direction, and cleaning hole 105 sets up along the circumferencial direction with the inner wall of extension 32, the washing liquid flows into this recess 104 from cleaning hole 105 behind connecting pipe 3, wash recess 104, the washing liquid can also be washd to the outer wall of cup 1 by the distribution of rotatory cup, so, not only can reach and carry out abluent mesh to the inside of cup, can also wash the outside of cup, the cleaning efficiency of cup has been improved.
As an example, the diameter of the cleaning hole 105 may be 2 mm, and the size of the cleaning hole 105 is not limited thereto in the embodiment of the present invention.
In a possible realization mode, the included angle between the section generatrices of the outer wall of the cup body 1 along the same axis is 45-120 degrees.
According to the embodiment of the invention, the included angle between the outer wall of the cup body 1 and the section generatrix of the same axis is set to be 45-120 degrees, so that the annular wall formed by the outer wall of the cup body 1 and the cup wall below the platform can be cleaned, and the cleaning efficiency is improved.
For example, the included angle between the section generatrices of the outer wall of the cup body 1 along the same axis may be 45 °, 60 °, 65 °, 75 °, 85 °, 95 °, 115 °, 120 °, and the like.
The extension part 32 provided by the embodiment of the invention is communicated with the first liquid channel 102 and the cleaning hole 105, and the extension part 32 and the transition part 31 can be connected by welding or integrally formed by stamping. Therefore, the connection strength of the cup head base 3 can be improved.
In one possible implementation, as shown in fig. 9, the diameter of the extension 32 is larger than the diameter of the first fluid channel 102, so that the cleaning tube or paint tube completely enters the extension 32 and completely contacts the cup head, thereby preventing paint from leaking out or cleaning fluid from being left behind.
In one possible implementation, as shown in fig. 9, the cup head further includes: a connecting piece 4;
first connecting hole has been seted up to the lower surface of plate of distributor 2, has seted up the second connecting hole on the transition portion 31, and bottom in plate of distributor 2 and the cup 1 is connected through first connecting hole and second connecting hole to connecting piece 4.
As an example, the connection member 4 provided by the embodiment of the present invention may be a bolt, and the first connection hole and the second connection hole may be bolt holes. The number of the connecting pieces 4 provided in the embodiment of the present invention may be 1, or may be multiple, and for example, may be 2, 3, or 4. The number of the connecting members 4 in the embodiment of the present invention is not limited thereto.
When the connection member 4 is plural, the first connection hole and the second connection hole may be circumferentially provided at the transition portion 31.
In a possible implementation, the material of the cup body 1 is a titanium alloy material.
The high-grade titanium alloy has the characteristics of high strength, small density, good mechanical property, good toughness and corrosion resistance and the like, so that the cup head can be applied to coating of various coatings for a long time.
On the other hand, the embodiment of the invention also provides the electrostatic rotary cup which comprises any one of the atomizing cup heads.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An atomizing cup, characterized in that, atomizing cup includes: a cup body (1) and a distribution plate (2);
the distribution plate (2) is arranged in the cup body (1), and a liquid filling cavity (101) is formed between the lower surface of the distribution plate (2) and the inner wall of the cup body (1);
the bottom of the cup body (1) is provided with a first liquid channel (102) communicated with the liquid filling cavity (101), and the center of the distribution disc (2) is provided with a second liquid channel (103) communicated with the liquid filling cavity (101);
a gap is formed between the distribution plate (2) and the inner wall of the cup body (1), so that when the cup body (1) rotates and liquid enters the liquid filling cavity (101), one part of the liquid rises to the cup edge (11) of the cup body (1) through the gap, and the other part of the liquid rises to the cup edge (11) of the cup body (1) after flowing through the upper surface of the distribution plate (2) through the second liquid channel (103);
the cup edge (11) of the cup body (1) is provided with fine teeth which are used for cutting the liquid;
the curve of the inner wall of the cup body (1) formed by rotation is an inverse trigonometric cosine function curve: y is arccos x, wherein y is the height of the cup body (1), x is the width of the cup body (1), and a cup edge (11) of the cup body (1) is in transition with the outer wall of the cup body (1) through a fillet;
the lower end of the inner wall of the cup body (1) extends inwards to form a platform, the distribution disc (2) is located above the platform, a liquid filling cavity (101) is formed between the lower surface of the distribution disc (2) and the platform, a cup wall extending to the lower portion of the platform forms an annular wall, a base (3) is formed below the platform, and a groove (104) is formed between the annular wall and the base (3).
2. The atomizing cup head according to claim 1, characterized in that the gap between the distribution disk (2) and the inner wall of the cup body (1) is smaller than the cross-sectional area of the liquid-filled chamber (101), through which the liquid can be accelerated when rising to the cup edge (11) of the cup body (1).
3. The atomizing cup head according to claim 1, characterized in that said base (3) comprises a transition portion (31) and an extension portion (32) connected in series from top to bottom, said first liquid channel (102) being provided on said transition portion (31).
4. The atomizing cup head according to claim 3, characterized in that said first liquid passage (102) comprises: reducing section (1021) and diameter section (1022) that from top to bottom communicate in order, the diameter of reducing section (1021) from top to bottom reduces gradually, the diameter of diameter section (1022) is unchangeable, reducing section (1021) with cavity (101) intercommunication is filled to liquid, extension (32) are hollow structure, diameter section (1022) with extension (32) intercommunication, the diameter of extension (32) is greater than the diameter of diameter section (1022), extension (32) are used for with scavenge pipe or coating union coupling.
5. The atomizing cup head according to claim 3, characterized in that a plurality of cleaning holes (105) are formed in one end of the extending portion (32) connected with the transition portion along the circumferential direction, the cleaning holes (105) are communicated with the groove (104), and the cleaning holes (105) are used for cleaning the groove (104) by entering a part of cleaning liquid into the groove (104) from the cleaning holes (105) after the cleaning pipe is connected with the extending portion.
6. The atomizing cup head according to claim 1, characterized in that the included angle between the outer walls of the cup body (1) along the same axial section generatrix is between 45 ° and 120 °.
7. The atomizing cup head of claim 3, wherein said atomizing cup head further comprises: a connecting piece (4);
the lower surface of the distribution disc (2) is provided with a first connecting hole, the transition part (31) is provided with a second connecting hole, and the connecting piece (4) is connected with the distribution disc (2) and the bottom of the cup body (1) through the first connecting hole and the second connecting hole.
8. An electrostatic spinning cup, wherein said electrostatic spinning cup comprises an atomizing cup head according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089464.3A CN110841818B (en) | 2019-11-08 | 2019-11-08 | Atomizing cup head and electrostatic rotary cup |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089464.3A CN110841818B (en) | 2019-11-08 | 2019-11-08 | Atomizing cup head and electrostatic rotary cup |
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| Publication Number | Publication Date |
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| CN110841818A CN110841818A (en) | 2020-02-28 |
| CN110841818B true CN110841818B (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911089464.3A Active CN110841818B (en) | 2019-11-08 | 2019-11-08 | Atomizing cup head and electrostatic rotary cup |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1052657A (en) * | 1996-08-12 | 1998-02-24 | Nissan Motor Co Ltd | Rotational atomization electrostatic coating apparatus |
| CN201911970U (en) * | 2010-12-30 | 2011-08-03 | 孙蔓苓 | Health-preserving foot tub |
| CN205324025U (en) * | 2016-01-18 | 2016-06-22 | 杨福毅 | Atomizing cup head |
| CN107321513A (en) * | 2017-08-08 | 2017-11-07 | 廊坊铭捷涂装技术有限公司 | Modularization revolves cup |
-
2019
- 2019-11-08 CN CN201911089464.3A patent/CN110841818B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1052657A (en) * | 1996-08-12 | 1998-02-24 | Nissan Motor Co Ltd | Rotational atomization electrostatic coating apparatus |
| CN201911970U (en) * | 2010-12-30 | 2011-08-03 | 孙蔓苓 | Health-preserving foot tub |
| CN205324025U (en) * | 2016-01-18 | 2016-06-22 | 杨福毅 | Atomizing cup head |
| CN107321513A (en) * | 2017-08-08 | 2017-11-07 | 廊坊铭捷涂装技术有限公司 | Modularization revolves cup |
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|---|---|
| CN110841818A (en) | 2020-02-28 |
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