CN111701739B - Electrostatic spraying device and method for conductive base material - Google Patents
Electrostatic spraying device and method for conductive base material Download PDFInfo
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- CN111701739B CN111701739B CN202010543260.9A CN202010543260A CN111701739B CN 111701739 B CN111701739 B CN 111701739B CN 202010543260 A CN202010543260 A CN 202010543260A CN 111701739 B CN111701739 B CN 111701739B
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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
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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
- 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
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- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
The invention discloses a conductive substrate electrostatic spraying device and a method. The device comprises a conveying device, a spray gun, a positive electrode and a negative electrode, wherein the conveying device is used for conveying a to-be-sprayed conductive base material along a preset conveying route, a spraying operation area of two parts of the to-be-sprayed conductive base material on the conveying route is in a state that an upper layer and a lower layer are opposite, the part of the to-be-sprayed conductive base material which is opposite to the upper layer is marked as an upper-layer base material, the part of the to-be-sprayed conductive base material which is opposite to the lower layer is marked as a lower-layer base material, the spray gun is arranged above the spraying operation area, the negative electrode is electrically connected with the spray gun and used for providing negative charges for the spray gun, and the positive electrode is in contact with any position of the to-be-sprayed conductive base material and used for providing positive charges for the to-be-sprayed conductive base material. The method is simple and easy to implement, has low cost, and can improve the thickness of the electrostatic spraying coating, reduce the difficulty of secondary spraying and improve the uniformity of the coating.
Description
Technical Field
The invention belongs to the technical field of electrostatic spraying, and particularly relates to a conductive substrate electrostatic spraying device and method.
Background
The roll-to-roll manufacturing is widely applied to various fields of lithium ion battery pole pieces, organic battery films, fuel battery electrodes, functional films and the like, and is the development direction of advanced processing modes. Electrostatic spraying has recently been used for coil production because of its advantages such as high coating efficiency, good coating quality, and high efficiency. The base material can form a coating through processes of electrostatic spraying, subsequent curing and the like, and finally the coating is recovered into a coil to obtain the required product.
However, when the electrostatic spraying is used, a high-voltage electrostatic field is generated, electric spark discharge is easily caused when the spraying distance is too close, certain potential safety hazards exist, the distance between a spray gun and a base material to be sprayed is limited, and the spraying thickness is limited finally; further, the sprayed material has a poor conductivity and a small electric field force, and when the secondary spraying is performed, there are problems that the loading is difficult and the spraying rate is low. The problems restrict the application of electrostatic spraying in the production of coiled materials, and the improvement of the adsorption force and the coating thickness of the coating has great significance for electrostatic spraying and coiled material manufacturing.
With respect to the problems of the thickness of the electrostatic spray coating and the adsorption force of the coating, the existing research mainly focuses on two aspects, namely, the adsorption force is improved by changing the conductivity of the coating, but the cost is increased; secondly, add corresponding size steel sheet or aluminum plate below waiting to spray the substrate to improve electric field force and strengthen the coating thickness, but the coiled material is of a great variety of sizes, and the coiled material of each size all needs the steel sheet or the aluminum plate of corresponding size can guarantee the homogeneity of final coating, and this makes the process loaded down with trivial details and the cost also increases thereupon.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides the conductive substrate electrostatic spraying device and the conductive substrate electrostatic spraying method, which are simple and easy to implement, have lower cost, can improve the thickness of the electrostatic spraying coating, reduce the difficulty of secondary spraying and improve the uniformity of the coating.
To achieve the above object, according to a first aspect of the present invention, there is provided an electrostatic coating apparatus for an electrically conductive substrate, comprising: the conveying device is used for conveying the to-be-sprayed conductive base materials along a preset conveying route, two parts of the to-be-sprayed conductive base materials are in a spraying operation area on the conveying route, the upper layer and the lower layer of the to-be-sprayed conductive base materials are opposite, the parts of the to-be-sprayed conductive base materials, which are opposite to each other, are marked as upper-layer base materials, the parts of the to-be-sprayed conductive base materials, which are opposite to each other, are marked as lower-layer base materials, the spray gun is arranged above the spraying operation area, the negative pole is electrically connected with the spray gun and used for providing negative charges for the spray gun, and the positive pole is in contact with any position of the to-be-sprayed conductive base materials and used for providing positive charges for the to-be-sprayed conductive base materials.
Preferably, the conveying device comprises an unwinding roller, a first passing roller, a second passing roller, a third passing roller, a fourth passing roller and a winding roller, the unwinding roller, the first passing roller, the second passing roller, the third passing roller, the fourth passing roller and the winding roller are arranged along the conveying route, the part of the conductive substrate to be sprayed between the first passing roller and the second passing roller is the lower-layer substrate, the part of the conductive substrate to be sprayed between the third passing roller and the fourth passing roller is the upper-layer substrate, and the arrangement positions of the first passing roller, the second passing roller, the third passing roller and the fourth passing roller are satisfied so that the lower-layer substrate and the upper-layer substrate are in a state of being opposite to each other.
Preferably, the conductive substrate electrostatic spraying device further comprises: an adjustment mechanism for adjusting the position of the lower substrate and/or the upper substrate such that the edges of the lower substrate and the upper substrate remain aligned.
Preferably, the adjustment mechanism comprises: the device comprises an edge detector, an industrial personal computer, a driver and a deviation rectifying wheel; the edge detector is used for detecting the edge position of the lower-layer base material and/or the upper-layer base material and sending an edge position signal to the industrial personal computer; the industrial personal computer is used for sending a deviation rectifying driving signal to the driver according to the edge position signal; the driver is used for controlling and adjusting the deviation rectifying wheels according to the deviation rectifying driving signals so that the edges of the lower-layer base material and the upper-layer base material are kept aligned.
Preferably, the upper and lower substrates are parallel.
Preferably, the spray gun is arranged at an angle of 45 ° to the plane of the upper substrate.
Preferably, the substrate to be sprayed is a conductive substrate applied to roll-to-roll manufacturing.
Preferably, the distance between the upper substrate and the lower substrate is not more than 8 mm.
Preferably, the conductive substrate electrostatic spraying device comprises a plurality of spray guns, and the spatial postures of the spray guns are kept consistent.
According to a second aspect of the present invention, there is provided an electrostatic spraying method for a conductive substrate, comprising the steps of:
conveying the conductive base material to be sprayed along a preset conveying route, enabling a spraying operation area of two parts of the conductive base material to be sprayed on the conveying route to be in a state that an upper layer and a lower layer are opposite, arranging a spray gun for spraying operation above the spraying operation area, recording the part of the conductive base material to be sprayed, which is opposite to the upper layer, as an upper layer base material, and recording the part of the conductive base material to be sprayed, which is opposite to the lower layer, as a lower layer base material;
and providing a negative charge for a spray gun, providing a positive charge for the conductive substrate to be sprayed, and then spraying the upper substrate by using the spray gun.
In general, compared with the prior art, the invention has the following beneficial effects: (1) in the spraying process, the upper and lower layers of base materials carry the same charges, and the charges of the upper layer of base materials are enriched on the upper surface by the charge repulsion principle, so that the adsorption force on the coating is enhanced; the upper-layer base material to be sprayed is positioned between the spray gun and the lower-layer base material, and the existence of the lower-layer base material replaces the placement of a conductive steel plate or an aluminum plate below the base material to be sprayed, so that the strength and the stability of a high-voltage electrostatic field between the electrostatic spray gun and the base material are improved; in addition, the precision of the base material to be sprayed is generally high, the uniform distribution of charges of the upper and lower layers of base materials can be ensured, the uniformity of an electric field during spraying can also be ensured due to the size consistency of the upper and lower layers of base materials, and finally, a uniform coating is obtained. (2) The principle is simple, the operation is convenient, and the cost is lower on the whole. (3) The adsorption capacity of the coating is improved, the utilization rate of the coating is further improved, and energy conservation and emission reduction are realized. (4) The uniformity of the coating can be further improved, and a coating and a product with better quality can be obtained.
Drawings
FIG. 1 is a schematic structural diagram of an electrostatic spraying apparatus for conductive substrates according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an adjusting mechanism of an electrostatic spraying apparatus for conductive substrate according to an embodiment of the present invention;
description of reference numerals: the device comprises an unwinding roller (1), a first roller (2), a second roller (3), a third roller (4), a fourth roller (5), a winding roller (6), a spray gun (7), an anode (8), a cathode (9), an edge detector (10), an industrial personal computer (11), a driver (12) and a deviation rectifying wheel (13).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The electrostatic spraying device for the conductive base material comprises an unwinding roller (1), a first roller (2), a second roller (3), a third roller (4), a fourth roller (5), a winding roller (6), a spray gun (7), a positive electrode (8) and a negative electrode (9) as shown in fig. 1.
The unreeling roller (1), the first roller (2), the second roller (3), the third roller (4), the fourth roller (5) and the reeling roller (6) form a conveying device, and the conductive base material to be sprayed is conveyed along a preset conveying route. The substrate to be sprayed may be a conductive substrate applied in roll-to-roll manufacturing. Before electrostatic spraying, the base material is wound around a first roller (2), a second roller (3), a third roller (4) and a fourth roller (5), the part, between the first roller (2) and the second roller (3), of the conductive base material to be sprayed is marked as a lower-layer base material, the part, between the third roller (4) and the fourth roller (5), of the conductive base material to be sprayed is marked as an upper-layer base material, and the arrangement positions of the first roller (2), the second roller (3), the third roller (4) and the fourth roller (5) meet the requirement that the upper layer and the lower layer of the base material are opposite.
The position of the lower layer substrate and the upper layer substrate in the relative form of the upper layer and the lower layer is the spraying operation area.
The spray gun (7) is arranged above the spraying operation area, the negative electrode (9) is electrically connected with the spray gun (7) to provide negative charges for the spray gun (7), and the positive electrode (8) is contacted with any position of the conductive base material to be sprayed to provide positive charges for the conductive base material to be sprayed.
During spraying, the charges of the lower substrate and the upper substrate are mutually exclusive to enable the positive charges of the upper substrate to be concentrated on the upper surface, the upper substrate to be sprayed is positioned between the spray gun (7) and the lower substrate, and the substrate with uniform positive charges below is lined to increase the strength and stability of a high-voltage electrostatic field between the electrostatic spray gun and the substrate, so that the adsorption force and the dispersion uniformity of the coating are improved.
In order to make the electrostatic spraying effect better, the following method can be adopted.
Preferably, the conductive substrate electrostatic spraying device further comprises an adjusting mechanism for adjusting the position of the lower substrate and/or the upper substrate so that the edges of the lower substrate and the upper substrate are kept aligned. Therefore, the uniform distribution of charges of the upper and lower layers of base materials can be ensured, the balance of an electric field during spraying is ensured, and the spraying uniformity is further improved.
Preferably, as shown in fig. 2, the adjusting mechanism includes: the device comprises an edge detector (10), an industrial personal computer (11), a driver (12) and a deviation rectifying wheel (13).
And the edge detector (10) is used for detecting the edge position of the lower-layer substrate and/or the lower-layer substrate and sending an edge position signal to the industrial personal computer (11). The edge detector (10) may be a camera mounted below the lower substrate and/or above the upper substrate to image the lower substrate and/or the upper substrate. The edge detector (10) may also be other devices.
And the industrial personal computer (11) is used for receiving the edge position signal of the lower layer base material and/or the upper layer base material, comparing the edge position signal with a preset value, and sending a deviation rectifying driving signal to the driver (12) according to the deviation amount.
And the driver (12) is used for controlling and adjusting the deviation rectifying wheel (13) according to the deviation rectifying driving signal, and adjusting the lower-layer base material and/or the upper-layer base material by adjusting the deviation rectifying wheel (13) so that the edges of the lower-layer base material and the upper-layer base material are kept aligned. The deviation rectifying wheel (13) controls one or more of the first roller (2), the second roller (3), the third roller (4) and the fourth roller (5), so that the transverse displacement generated by the lower-layer base material and/or the upper-layer base material in the winding and unwinding processes is controlled.
Preferably, the upper substrate and the lower substrate are placed parallel to each other.
Preferably, the spray gun is positioned at 45 ° to the plane of the overlying substrate to be sprayed.
Preferably, the upper-layer base material passes through the third roller (4) and the fourth roller (5) and then moves at a constant speed in the horizontal direction.
Preferably, the positions of the upper substrate and the lower substrate are adjusted to keep the distance between the upper substrate and the lower substrate not more than 8 mm.
Preferably, the conductive substrate electrostatic spraying device comprises a plurality of spray guns, and the spatial attitudes of the plurality of spray guns are kept consistent.
In particular, the structure of the unwinding roller (1), the first passing roller (2), the second passing roller (3), the third passing roller (4), the fourth passing roller (5) and the winding roller (6) is just one example of the conveying device. In fact, the conveying device may be any structure, as long as the conveying device conveys the conductive substrate to be sprayed along the preset conveying route, and the two spraying operation areas of the two parts of the conductive substrate to be sprayed on the conveying route are in a form that the upper layer and the lower layer are opposite. For example, the number, location, etc. of the sticks may be modified according to the process operating requirements.
The electrostatic spraying method for the conductive base material comprises the following steps:
conveying the conductive base material to be sprayed along a preset conveying path, enabling a spraying operation area of two parts of the conductive base material to be sprayed on the conveying path to be in a state that an upper layer and a lower layer are opposite, arranging a spray gun for spraying operation above the spraying operation area, recording the part of the conductive base material to be sprayed, which is opposite to the upper layer, as an upper layer base material, and recording the part of the conductive base material to be sprayed, which is opposite to the lower layer, as a lower layer base material;
providing negative charge to the spray gun, providing positive charge to the conductive substrate to be sprayed, and then spraying the upper substrate by using the spray gun. When the upper base material moves to a state that the upper base material and the lower base material are opposite to each other, the electrostatic spray gun starts spraying.
Preferably, the conductive substrate electrostatic spraying method further comprises the steps of: the position of the lower substrate and/or the upper substrate is adjusted so that the edges of the lower substrate and the upper substrate remain aligned.
The principles and technical effects of the conductive substrate electrostatic spraying method and the conductive substrate electrostatic spraying device are the same, and are not described herein again.
Examples comparative experiments:
to better illustrate the advantages of the present invention, two experimental schemes were designed as follows: (1) the traditional electrostatic spraying device and method are adopted; (2) the electrostatic spraying apparatus and method described in the examples were used.
The standard deviation of the thickness and the scanning thickness of the battery pole piece after electrostatic spraying in the two experimental schemes is respectively tested, so that the improvement effect of the invention on the thickness and the quality of the electrostatic spraying coating is reflected. The experimental data are shown in table 1.
TABLE 1 thickness value and scanning thickness standard deviation of battery pole piece obtained by two experimental schemes
It can be seen from table 1 that the thickness of the electrode prepared by the apparatus and method described in the embodiment (2) is increased by 20um and the standard deviation is reduced by 0.3um compared to the embodiment (1), reflecting that the embodiment of the present invention can improve the thickness and quality of the electrostatic coating.
It must be noted that in any of the above embodiments, the methods are not necessarily executed in order of sequence number, and as long as it cannot be assumed from the execution logic that they are necessarily executed in a certain order, it means that they can be executed in any other possible order.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An electrostatic spraying device for conductive substrates, comprising: the conveying device is used for conveying the conductive base materials to be sprayed along a preset conveying path, two parts of the conductive base materials to be sprayed are in a spraying operation area on the conveying path, the upper layer and the lower layer are opposite, the parts of the conductive base materials to be sprayed, which are opposite to each other, are marked as upper-layer base materials, the parts of the conductive base materials to be sprayed, which are opposite to each other, are marked as lower-layer base materials, the spray gun is arranged above the spraying operation area, the negative electrode is electrically connected with the spray gun and used for providing negative charges for the spray gun, the positive electrode is in contact with any position of the conductive base materials to be sprayed and used for providing positive charges for the conductive base materials to be sprayed, and the two local positive charges in the opposite forms of the upper layer and the lower layer are mutually exclusive.
2. The electrostatic spraying device for the conductive substrate as claimed in claim 1, wherein the conveying device comprises an unwinding roller, a first passing roller, a second passing roller, a third passing roller, a fourth passing roller and a winding roller, the unwinding roller, the first passing roller, the second passing roller, the third passing roller, the fourth passing roller and the winding roller are arranged along the conveying route, a part of the conductive substrate to be sprayed between the first passing roller and the second passing roller is the lower substrate, a part of the conductive substrate to be sprayed between the third passing roller and the fourth passing roller is the upper substrate, and the arrangement positions of the first passing roller, the second passing roller, the third passing roller and the fourth passing roller are satisfied such that the lower substrate and the upper substrate are in a form of an upper layer and a lower layer.
3. The electrostatic spraying device for conductive substrates as claimed in claim 1 or 2, further comprising: an adjustment mechanism for adjusting the position of the lower substrate and/or the upper substrate such that the edges of the lower substrate and the upper substrate remain aligned.
4. The electrostatic spraying apparatus for conductive substrates as claimed in claim 3, wherein said adjustment mechanism comprises: the device comprises an edge detector, an industrial personal computer, a driver and a deviation rectifying wheel; the edge detector is used for detecting the edge position of the lower-layer base material and/or the upper-layer base material and sending an edge position signal to the industrial personal computer; the industrial personal computer is used for sending a deviation rectifying driving signal to the driver according to the edge position signal; the driver is used for controlling and adjusting the deviation rectifying wheels according to the deviation rectifying driving signals so that the edges of the lower-layer base material and the upper-layer base material are kept aligned.
5. The electrostatic spraying device for conductive substrates of claim 1 or 2 wherein the upper substrate and the lower substrate are parallel.
6. An electrostatic spraying device for conductive substrates as claimed in claim 1 or claim 2 wherein the spray gun is disposed at 45 ° to the plane of the overlying substrate.
7. The electrostatic spraying device for the conductive substrate as claimed in claim 1 or 2, wherein the substrate to be sprayed is a conductive substrate applied to roll-to-roll manufacturing.
8. The electrostatic spraying device for conductive substrates of claim 1 or 2, wherein the distance between the upper substrate and the lower substrate is not more than 8 mm.
9. An electrostatic spraying apparatus for conductive substrates as claimed in claim 1 or claim 2, comprising a plurality of said spray guns, said plurality of spray guns being spatially oriented in a uniform manner.
10. An electrostatic spraying method for a conductive substrate is characterized by comprising the following steps:
conveying the conductive base material to be sprayed along a preset conveying route, enabling a spraying operation area of two parts of the conductive base material to be sprayed on the conveying route to be in a state that an upper layer and a lower layer are opposite, arranging a spray gun for spraying operation above the spraying operation area, recording the part of the conductive base material to be sprayed, which is opposite to the upper layer, as an upper layer base material, and recording the part of the conductive base material to be sprayed, which is opposite to the lower layer, as a lower layer base material;
providing negative charges for a spray gun, providing positive charges for the conductive base material to be sprayed, enabling two local positive charges in the conductive base material to be sprayed to be mutually exclusive and presenting a relative form of an upper layer and a lower layer, and then spraying the upper layer base material by using the spray gun.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010543260.9A CN111701739B (en) | 2020-06-15 | 2020-06-15 | Electrostatic spraying device and method for conductive base material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010543260.9A CN111701739B (en) | 2020-06-15 | 2020-06-15 | Electrostatic spraying device and method for conductive base material |
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| Publication Number | Publication Date |
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| CN111701739A CN111701739A (en) | 2020-09-25 |
| CN111701739B true CN111701739B (en) | 2021-10-29 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3631270A1 (en) * | 1986-09-13 | 1988-03-24 | Kopperschmidt Mueller & Co | DEVICE FOR SPRAY COATING WORKPIECES |
| CN104985937B (en) * | 2015-07-01 | 2017-04-12 | 浙江长海包装集团有限公司 | Ink-jet printer |
| CN207891631U (en) * | 2017-12-29 | 2018-09-21 | 常州好特曼石墨烯制品有限公司 | Graphene fabric weaving flocking machine |
| CN108301146B (en) * | 2018-01-30 | 2023-09-26 | 江苏大学 | Device and method for preparing structural color of flexible matrix |
| CN109248834A (en) * | 2018-11-27 | 2019-01-22 | 深圳智合新科技有限公司 | Continous way pole piece producing line |
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