CN109365199B - Powder coating heterochromatic spraying one-step forming production line and spraying process - Google Patents
Powder coating heterochromatic spraying one-step forming production line and spraying process Download PDFInfo
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- CN109365199B CN109365199B CN201811578730.4A CN201811578730A CN109365199B CN 109365199 B CN109365199 B CN 109365199B CN 201811578730 A CN201811578730 A CN 201811578730A CN 109365199 B CN109365199 B CN 109365199B
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- 239000000843 powder Substances 0.000 title claims abstract description 121
- 238000005507 spraying Methods 0.000 title claims abstract description 112
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 15
- 230000008569 process Effects 0.000 title claims description 14
- 239000000725 suspension Substances 0.000 claims abstract description 27
- 239000007921 spray Substances 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 5
- 238000013007 heat curing Methods 0.000 claims description 32
- 229920001187 thermosetting polymer Polymers 0.000 claims description 29
- 230000001360 synchronised effect Effects 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 11
- 239000004593 Epoxy Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 description 13
- 238000001723 curing Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009500 colour coating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
- B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
- B05B13/0264—Overhead conveying means, i.e. the object or other work being suspended from the conveying means; Details thereof, e.g. hanging hooks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0278—Arrangement or mounting of spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a powder coating heterochromatic spraying one-step forming production line, which comprises a suspension chain, a first powder spraying chamber and a second powder spraying chamber, wherein the first powder spraying chamber and the second powder spraying chamber are sequentially arranged outside the suspension chain; the first powder spraying chamber and the second powder spraying chamber are respectively provided with a coating nozzle communicated with a coating storage tank, and the second powder spraying chamber is also provided with a plurality of gas nozzles communicated with a gas source; the coating spray nozzle in the first powder spraying chamber and the gas spray nozzle in the second powder spraying chamber face the top surface or the top surface movement track or the bottom surface movement track of the workpiece hung by the lifting appliance in a consistent manner, and the coverage range of the gas flow of the gas spray nozzle on the top surface movement track or the bottom surface movement track is smaller than the horizontal projection area of the corresponding top surface or bottom surface of the workpiece hung by the lifting appliance. The powder coating heterochromatic spraying one-step forming production line changes the motion trail of the secondary spraying powder by utilizing the air flow guiding function, and prevents the secondary spraying powder from being adsorbed on the primary spraying surface.
Description
Technical Field
The invention relates to the field of powder spraying equipment, in particular to a powder coating heterochromatic spraying one-step forming production line and a spraying process.
Background
The spool in the prior art is usually sprayed by thermosetting powder such as epoxy powder, and finally forms a bright, clean and uniform coating on the surface of the spool after high-temperature curing. In order to distinguish the positive and negative directions of winding, the color of the outer disc surface of the flange plate at one end of the spool is inconsistent with the color of other positions.
The operation of the prior art double layer spray coating is as described in CN106862043a, and comprises the following steps: spraying color paint on the region needing color coating treatment, and performing spray quality inspection after drying; masking the color register area; carrying out surface treatment on the unmasked area; spraying natural color paint on the unmasked area, and performing spraying quality inspection after drying; removing the shielding; spraying varnish on the whole vehicle, and performing overall spraying quality inspection after drying; and (5) finishing spraying. The double-color spraying of the similar spool comprises the following steps: the method comprises the steps of firstly carrying out integral spraying or spraying with a slightly avoiding heterochromatic disc surface on the spool, fully curing once to form a paint film, then holding one flange disc surface of the spool, tightly pressing the disc surface of the other flange disc on a circular powder spraying hole of a powder spraying chamber to carry out secondary powder spraying on the disc surface, and finally carrying out secondary curing on the spool. The technical problems in the production process are as follows: firstly, the steps are complicated, the primary curing is required to be sufficient, otherwise, the problem of thermosetting powder stripping at the contact part of the spool and the round powder spraying hole is easy to occur; secondly, taking epoxy thermosetting powder as an example, the temperature required for full curing is about 220 ℃, the duration is about 20min, and the energy consumption and the time consumption for two curing are relatively large; and secondly, secondary powder spraying can be performed after the powder is fully cooled after solidification, the manual operation amount is large, and the I-shaped wheels with different sizes also need to be provided with round powder spraying holes with corresponding sizes. The powder spraying process is also applied to other three-dimensional structure products with one surface having different colors.
Therefore, there is a need for improvements and optimizations in the color-changing spray equipment and spray processes of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a powder coating heterochromatic spraying one-step forming production line which adopts air flow to guide the escape direction of powder coating to finish heterochromatic coating on the top surface or the bottom surface.
In order to achieve the technical effects, the technical scheme of the invention is as follows: the one-step forming production line for powder coating heterochromatic spraying is characterized by comprising a suspension chain, a first powder spraying chamber and a second powder spraying chamber which are sequentially arranged outside the suspension chain, wherein a plurality of lifting appliances are hung on the suspension chain, and a driving mechanism for driving the lifting appliances to rotate is arranged in the second powder spraying chamber; the first powder spraying chamber and the second powder spraying chamber are respectively provided with a coating nozzle communicated with a coating storage tank, and the second powder spraying chamber is also provided with a plurality of gas nozzles communicated with a gas source;
the coating nozzle in the first powder spraying chamber and the gas nozzle in the second powder spraying chamber face the top surface or the top surface movement track or the bottom surface movement track of the workpiece hung by the lifting appliance in a consistent manner, and the coverage area of the gas flow of the gas nozzle on the top surface movement track or the bottom surface movement track is smaller than the horizontal projection area of the corresponding top surface or bottom surface of the workpiece hung by the lifting appliance.
The preferable technical scheme is that a first powder spraying chamber, a first heat curing chamber, a second powder spraying chamber and a second heat curing chamber are sequentially arranged outside a suspension chain.
The preferable technical scheme is that the included angle between the injection angle of the gas nozzle and the horizontal plane is smaller than 45 degrees.
The preferable technical proposal is that the air nozzle is an air knife, and the included angle between the knife edge of the air knife and the horizontal plane is 5-20 degrees.
The preferable technical scheme is that the lifting appliance is a gear rotary lifting appliance, the driving mechanism is arranged below the suspension chain and comprises a synchronous belt, a driving motor and at least two synchronous pulleys, the synchronous belt is tensioned and arranged outside the at least two synchronous pulleys, teeth of the synchronous belt are meshed with teeth of a horizontal gear in the gear rotary lifting appliance, and a driving end of the driving motor is connected with the synchronous pulleys.
The second object of the present invention is to provide a spraying process, which is characterized by comprising the following steps:
s1: spraying the bottom surface or the top surface of the hanging workpiece with first thermosetting powder;
s2: first heat curing;
S3: introducing the suspended workpiece into a cavity with flat upward airflow or downward airflow, spraying the rest surface of the suspended workpiece with second thermosetting powder while the workpiece rotates, wherein the first thermosetting powder and the second thermosetting powder are different in color;
s4: a second heat curing of the workpiece;
and (3) the flat upward airflow or downward airflow in the S3 moves towards the edge of the S1 spraying surface or the movement track of the S1 spraying surface of the workpiece.
The preferred technical scheme is that the first heat curing temperature in S2 is lower than the second heat curing temperature in S4.
The preferable technical scheme is that the first thermosetting powder and the second thermosetting powder are both epoxy powder, the first thermosetting temperature in S2 is 140-200 ℃, the first thermosetting time is 7-20 min, the second thermosetting temperature in S4 is 210-240 ℃, and the second thermosetting time is 10-30 min.
The preferable technical proposal is that the workpiece is a spool, and the top surface or the bottom surface of the workpiece is the outer disk surface of a flange plate of the spool.
The invention has the advantages and beneficial effects that:
The powder coating heterochromatic spraying one-step forming production line is provided with two spraying steps, an air nozzle is adopted to spray air flow on the heterochromatic top surface or bottom surface of the workpiece, the guiding effect of the air flow is utilized to change the movement track of coating powder in the spraying process, and the powder coating sprayed for the two times is prevented from being adsorbed on the heterochromatic top surface or bottom surface of the workpiece;
the spool heterochromatic junction obtained by spraying through the production line has smooth and natural transition and clear interface at the heterochromatic junction;
The powder coating heterochromatic spraying process sequentially comprises four steps of primary spraying, primary heat curing, secondary spraying and secondary heat curing, and compared with the prior art, the temperature of the primary heat curing is lower than that of the secondary heat curing, the primary heat curing time is short, and the energy consumption and the single workpiece spraying time are both lower;
the process adopts suspension chains to drive and walk, so that the manual operation amount is small, and the automation degree is high.
Drawings
FIG. 1 is a schematic diagram of the powder coating heterochromatic spray one-step molding production line of example 1;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is an enlarged view of a portion of the second powder coating chamber of FIG. 1;
FIG. 4 is a schematic view showing the structure of a work piece and a gas nozzle in the direction of elongation of a suspension chain in example 1;
FIG. 5 is a schematic diagram of the powder coating heterochromatic spray one-step molding production line of example 2;
FIG. 6 is an enlarged view of a portion of B in FIG. 5;
FIG. 7 is a schematic view of the structure of the workpiece and the gas nozzle in the direction of the catenary extension;
fig. 8 is a schematic view showing the structure of the work and the gas nozzle and the paint nozzle in the extension direction of the suspension chain in example 3.
In the figure: 1. a suspension chain; 2. a first powder spraying chamber; 3. a second powder spraying chamber; 4. a second heat curing chamber; 5. a lifting appliance; 6. a driving mechanism; 61. a synchronous belt; 62. a driving motor; 63. a synchronous pulley; 7. a paint storage tank; 8. a paint nozzle; 9. a gas nozzle; 91. a first air knife; 92. a second air knife; 10. a gas source; 11. a first thermal curing chamber; 12. a horizontal gear; b. a workpiece.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
[ Position of gas nozzle ]
The gas nozzle in the second powder spraying chamber can be arranged above the workpiece or below the workpiece, and the gas nozzle is arranged above the workpiece because the lifting appliance is arranged between the workpiece and the suspension chain, so that the gas flow is inevitably blocked by a connecting piece between the lifting appliance and the workpiece, and the gas nozzle is preferably arranged below the workpiece.
When the workpiece on the suspension chain is in a self-rotation non-walking state, the coating nozzle in the first powder spraying chamber and the gas nozzle in the second powder spraying chamber face the top surface or the bottom surface or the top surface of the workpiece hung by the lifting appliance, and when the workpiece on the suspension chain is in a self-rotation walking state, the coating nozzle in the first powder spraying chamber and the gas nozzle in the second powder spraying chamber face the top surface movement track or the bottom surface movement track of the workpiece hung by the lifting appliance.
[ Gas nozzle selection ]
The gas nozzle has to meet the following requirements: the coverage area of the air flow of the air nozzle on the top surface movement track or the bottom surface movement track is smaller than the horizontal projection area of the corresponding top surface or bottom surface of the workpiece hung by the lifting appliance, namely when the workpiece moves to the coverage area of the air nozzle at a certain moment, one side or a part of the vertical periphery of the workpiece is positioned in the air flow coverage area of the air nozzle, and the coating nozzle of the second powder spraying chamber is arranged in the range of the vertical periphery of the workpiece, which is not influenced by the air flow. In order to ensure uniform adsorption of the coating powder, waste caused by that a large amount of coating powder enters the coating powder recovery device along with the air flow of the air nozzle is avoided, and the coverage range of the air flow of the air nozzle on the top surface movement track or the bottom surface movement track needs to be controlled slightly.
Specific categories of gas nozzles include, but are not limited to, hollow cone nozzles, solid cone nozzles, fan nozzles, and air knives. Based on the requirement that the coverage area of the air flow of the air nozzle on the top surface movement track or the bottom surface movement track needs to be controlled to be smaller, the preferable type of the air nozzle is a flat air nozzle, the air flow sprayed by the flat air nozzle is flat, and specific options include, but are not limited to, a fan-shaped nozzle and an air knife, and further preferably an air knife for spraying a laminar air flow.
[ Position of paint nozzle ]
The prior art paint nozzle is in close proximity to the surface of the workpiece to be coated. Taking the spool as an example, if the coating surface in the first powder spraying chamber is the bottom flange surface of the spool, the coating nozzle in the first powder spraying chamber is arranged near the top flange surface of the spool and the middle cylinder.
[ Air source ]
The air source comprises but is not limited to compressed air, and can be air blown by a blower, and preferably, the blower is connected with an air filtering component so as to reduce the content of dust and other particles in the air and optimize the coating effect of the powder coating.
[ Position of Flat gas nozzle and air outlet Angle ]
When the top surface or the bottom surface of the workpiece is planar, the included angle between the air flow direction sprayed by the fan-shaped nozzle and the air knife and the top surface or the bottom surface of the workpiece is not limited, and the included angle can be vertical to the top surface or the bottom surface of the workpiece or form an obtuse angle or an acute angle with the top surface or the bottom surface of the workpiece.
Further preferably, the blade edge of the air knife is slightly inclined. Taking the case that the air knife is arranged below the movement track of the workpiece, when the air flow of the thin sheet sprayed by the air knife is inclined slightly from the bottom of the workpiece to the edge of the workpiece, the edge of the air flow of the thin sheet is inclined upwards to the periphery of the workpiece, namely, the dissipation powder in the second powder spraying chamber is blown to the adjacent workpiece; when the air flow of the thin sheet sprayed by the air knife is inclined from the bottom of the workpiece to the inner side of the outer contour of the workpiece, the dissipation powder in the second powder spraying chamber can be blown to the workpiece above the air knife.
The air knife is arranged in the upper area of the movement track of the top surface of the workpiece or the lower area of the movement track of the bottom surface of the workpiece, or one end of the air knife is positioned in the upper area of the movement track of the top surface of the workpiece or the lower area of the movement track of the bottom surface of the workpiece, and the other end of the air knife is positioned in the upper area of the movement track of the top surface of the workpiece or outside the lower area of the movement track of the bottom surface of the workpiece, namely the air knife vertically corresponds to the movement track crossing the heterochromatic surface of the workpiece.
The included angle between the edge of the first air knife positioned on the workpiece air knife and the horizontal plane is 5-20 degrees, and more preferably 10-17 degrees.
[ Position of coating nozzle in second powder coating Chamber ]
The paint nozzle of the second powder spraying chamber is arranged adjacent to the air nozzle, but the paint nozzle is positioned outside the air flow coverage range of the air nozzle.
[ Workpiece Structure suitable for powder coating heterochromatic spraying one-step forming production line ]
Since the work is rotated and sprayed, the structure of the work is not limited significantly, and it is preferable that the work has a plane-shaped heterochromatic surface, and it is further preferable that the work is positioned at the edge of the plane by heterochromatic transfer.
[ First Heat curing Chamber ]
After the primary powder spraying is finished, an operator can detach the workpiece and put the workpiece into another heat curing chamber for curing; the hanging belt can be directly used for driving the workpiece to stop or walk, so that on-line heat curing can be performed. The latter variant is preferred.
[ Second Heat curing Chamber ]
After the secondary powder spraying is finished, an operator can detach the workpiece and put the workpiece into another heat curing chamber for curing; the hanging belt can be directly used for driving the workpiece to stop or walk, so that on-line heat curing can be performed. The latter variant is preferred.
[ Drive mechanism ]
The drive mechanism functions to drive the workpiece on the spreader in rotation, including but not limited to a motor-driven timing belt. Correspondingly, the driving mechanism comprises but is not limited to being connected with the second powder spraying chamber and can also be arranged on the lifting appliance, namely the lifting appliance is a self-rotating lifting appliance.
Example 1
As shown in fig. 1-4, the powder coating heterochromatic spraying one-step forming production line of the embodiment 1 comprises a suspension chain 1, a first powder spraying chamber 2, a second powder spraying chamber 3 and a second heat curing chamber 4 which are sequentially arranged outside the suspension chain 1, wherein a plurality of lifting appliances 5 are hung on the suspension chain 1, and a driving mechanism 6 for driving the lifting appliances to rotate is arranged in the second powder spraying chamber 3; the first powder spraying chamber 2 and the second powder spraying chamber 3 are respectively provided with a coating nozzle 8 communicated with a coating storage tank 7, the second powder spraying chamber 3 is provided with a plurality of flat gas nozzles 9, and the gas nozzles 9 are communicated with a gas source 10; the movement trace of the gas nozzle 9 toward the bottom surface of the workpiece.
In embodiment 1, the flat gas nozzle 9 is located below the motion track of the bottom surface of the workpiece, that is, on two sides of the suspension chain 1, the flat gas flow of the gas nozzle 9 is perpendicular to the extending direction of the suspension chain 1, one end of the gas nozzle 9 is located below the motion track of the bottom surface of the workpiece, and the other end extends to the lower outer side of the edge of the motion track of the bottom surface of the workpiece.
The lifting appliance 5 is a gear rotating lifting appliance, the driving mechanism 6 is arranged below the suspension chain 1, the driving mechanism 6 comprises a synchronous belt 61, a driving motor 62 and at least two synchronous pulleys 63, the synchronous belt 61 is arranged outside the at least two synchronous pulleys 63 in a tensioning manner, teeth of the synchronous belt 61 are meshed with teeth of a horizontal gear 12 in the gear rotating lifting appliance, and a driving end of the driving motor 62 is connected with the synchronous pulleys 63.
The gas nozzle 9 and the paint nozzle 8 of the powder paint spray assembly are both fixedly disposed in the second powder spray booth 3.
Example 2
As shown in fig. 5 to 7, embodiment 2 is based on embodiment 1, except that a first heat curing chamber 11 is further provided between the first powder spraying chamber 2 and the second powder spraying chamber 3 outside the suspension chain 1.
The air nozzle 9 is an air knife.
The air knives comprise a first air knife 91 and a second air knife 92, the edge of the first air knife 91 is vertical or approximately vertical (the included angle is 90+/-15 ℃) to the extending direction of the suspension chain 1, one end of the first air knife is positioned below the motion track of the bottom surface of the workpiece, and the other end of the first air knife extends to the outer side below the motion track of the bottom surface of the workpiece. The second air knife 92 is positioned below the movement track of the bottom surface of the workpiece, and the included angle a between the knife edge of the second air knife and the horizontal plane is 12 degrees.
Example 3
As shown in fig. 8, embodiment 3 is based on embodiment 2, except that the air nozzle in embodiment 3 is a solid cone air nozzle, and the relative positions of the workpiece, the solid cone air nozzle, and the paint nozzle in the second powder coating chamber are as shown in fig. 8.
The spraying process comprises the following steps:
s1: spraying the bottom surface of the hanging workpiece by using first thermosetting powder;
s2: first heat curing;
s3: placing the suspended workpiece in a cavity with flat upward airflow, and spraying the side surface and the top surface of the suspended workpiece with second thermosetting powder while the workpiece rotates to obtain a sprayed workpiece, wherein the colors of the first thermosetting powder and the second thermosetting powder are different;
s4: a second heat curing of the workpiece;
And S3, the flat upward airflow or downward airflow moves towards the bottom surface movement track of the workpiece hung by the lifting appliance.
The first thermosetting powder and the second thermosetting powder in examples 1 and 2 were both epoxy powders, the first heat curing temperature in S2 was 165 ℃, the first heat curing time was 10min, the second heat curing temperature in S4 was 225 ℃, and the second heat curing time was 20min.
The workpieces in the embodiment and the embodiment 2 are spool, and the top surface or the bottom surface of the workpiece is the outer disk surface of a flange plate of the spool.
The color transition between the flange disk surface and the curled side of the spool flanges of example 1 and example 2 obtained by the test is naturally smooth.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (7)
1. The one-step forming production line for powder coating heterochromatic spraying is characterized by comprising a suspension chain, a first powder spraying chamber and a second powder spraying chamber which are sequentially arranged outside the suspension chain, wherein a plurality of lifting appliances are hung on the suspension chain, and a driving mechanism for driving the lifting appliances to rotate is arranged in the second powder spraying chamber; the first powder spraying chamber and the second powder spraying chamber are respectively provided with a coating nozzle communicated with a coating storage tank, and the second powder spraying chamber is also provided with a plurality of gas nozzles communicated with a gas source;
The coating nozzle in the first powder spraying chamber and the gas nozzle in the second powder spraying chamber face the top surface or the top surface movement track or the bottom surface movement track of the workpiece hung by the lifting appliance in a consistent manner, and the coverage area of the gas flow of the gas nozzle on the top surface movement track or the bottom surface movement track is smaller than the horizontal projection area of the corresponding top surface or bottom surface of the workpiece hung by the lifting appliance;
The included angle between the injection angle of the gas nozzle and the horizontal plane is smaller than 45 degrees; the air nozzle is an air knife, and the included angle between the knife edge of the air knife and the horizontal plane is 5-20 degrees.
2. The powder coating heterochromatic spray one-time forming production line according to claim 1, wherein a first powder spraying chamber, a first heat curing chamber, a second powder spraying chamber and a second heat curing chamber are sequentially arranged outside the suspension chain.
3. The powder coating heterochromatic spraying one-time forming production line according to claim 1, wherein the lifting appliance is a gear rotating lifting appliance, the driving mechanism is arranged below the suspension chain and comprises a synchronous belt, a driving motor and at least two synchronous pulleys, the synchronous belt is arranged outside the at least two synchronous pulleys in a tensioning manner, teeth of the synchronous belt are meshed with teeth of a horizontal gear in the gear rotating lifting appliance, and a driving end of the driving motor is connected with the synchronous pulleys.
4. A spray process characterized by a powder coating heterochromatic spray one-shot forming line according to any one of claims 1 to 3, comprising the steps of:
s1: spraying the bottom surface or the top surface of the hanging workpiece with first thermosetting powder;
s2: first heat curing;
S3: introducing the suspended workpiece into a cavity with flat upward airflow or downward airflow, spraying the rest surface of the suspended workpiece with second thermosetting powder while the workpiece rotates, wherein the first thermosetting powder and the second thermosetting powder are different in color;
s4: a second heat curing of the workpiece; the flat upward air flow or the downward air flow in the S3 faces the edge of the S1 spraying surface of the workpiece or the movement track of the S1 spraying surface;
the coating nozzle in the first powder spraying chamber and the gas nozzle in the second powder spraying chamber face the top surface or the top surface movement track or the bottom surface movement track of the workpiece hung by the lifting appliance in a consistent manner, and the coverage area of the gas flow of the gas nozzle on the top surface movement track or the bottom surface movement track is smaller than the horizontal projection area of the corresponding top surface or bottom surface of the workpiece hung by the lifting appliance.
5. The spray process of claim 4 wherein the first heat cure temperature in S2 is lower than the second heat cure temperature in S4.
6. The spraying process according to claim 5, wherein the first thermosetting powder and the second thermosetting powder are both epoxy powder S2 having a first thermosetting temperature of 140 to 200 ℃, a first thermosetting time of 7 to 20 minutes, and S4 having a second thermosetting temperature of 210 to 240 ℃ and a second thermosetting time of 10 to 30 minutes.
7. The spray process of claim 4 wherein the workpiece is a spool and the top or bottom surface of the workpiece is the outside disk surface of the spool flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578730.4A CN109365199B (en) | 2018-12-24 | 2018-12-24 | Powder coating heterochromatic spraying one-step forming production line and spraying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578730.4A CN109365199B (en) | 2018-12-24 | 2018-12-24 | Powder coating heterochromatic spraying one-step forming production line and spraying process |
Publications (2)
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| CN112718281B (en) * | 2019-10-14 | 2022-07-19 | 上海中国弹簧制造有限公司 | Spring electrostatic powder spraying system |
| CN113083580A (en) * | 2021-03-30 | 2021-07-09 | 哈尔滨医科大学 | Coating atomizing coating device |
| CN114308446B (en) * | 2022-01-07 | 2023-10-13 | 福建盈浩文化创意股份有限公司 | Spraying equipment is used in decorative drawing production based on fixed point spraying |
| CN118321085B (en) * | 2024-06-17 | 2024-09-06 | 洛阳达伟铝业有限公司 | Spraying equipment for aluminum plate |
| CN118491753B (en) * | 2024-07-19 | 2024-09-17 | 江苏康业金属制品有限公司 | Injection mechanism for painting spool finished product |
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