CN210815804U

CN210815804U - Electrostatic spraying equipment and electrostatic spraying system

Info

Publication number: CN210815804U
Application number: CN201921555865.9U
Authority: CN
Inventors: 韩光辉; 陈彬; 刘扬
Original assignee: Xingtai Golan Kitchenware Co ltd
Current assignee: Hebei Sanxia Technology Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-06-23
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses an electrostatic spraying equipment and electrostatic spraying system, this electrostatic spraying equipment is provided with at least three shower nozzle, and the projection at the horizontal plane of line between at least adjacent three shower nozzle forms triangle-shaped, for setting up the shower nozzle respectively in top, bottom way, has reduced the coating powder that the top shower nozzle sprayed and the coating powder that the bottom shower nozzle sprayed condense the condition together under the action of gravity, and the coating layer roughness that obtains is higher; because the coating powder is light, the coating powder stays in the air for a longer time than after being condensed together, and therefore, the coating powder is more attached to the surface of the product, and the waste of the coating is reduced. The product is sprayed more uniformly than a fixed linear multi-nozzle structure by sequentially passing through the spraying areas of all the nozzles; and compare in the many shower nozzle structures of linear type of reciprocating type removal, the utility model discloses a structure is comparatively simple, consequently is difficult for breaking down, and equipment cost is lower, and installation, maintenance, repair, power consumption cost are also low.

Description

Electrostatic spraying equipment and electrostatic spraying system

Technical Field

The utility model relates to a technical field of surface coating especially relates to electrostatic spraying equipment and electrostatic spraying system.

Background

Spraying equipment, also known as painting equipment, is a special tool for covering metal and nonmetal surfaces with protective layers or decorative layers. Electrostatic spraying refers to a coating method in which atomized coating is negatively charged under the action of a high-voltage direct-current electric field by utilizing a corona discharge principle and is adsorbed on the surface of a positively charged substrate for discharge.

When the electrostatic spraying equipment with a single spray head is used for spraying the surface of a product, the product is sprayed unevenly, and the product quality cannot be guaranteed. When a plurality of electrostatic spraying devices with single spray heads are used for spraying the surfaces of products, the assembly floor area is large, the multi-process connection is difficult, and the using amount of operators is large.

The existing high-efficiency electrostatic powder spraying machine for the surface of a workpiece comprises an operation platform, a feeding mechanism, a spraying mechanism and a middle control mechanism; the spraying mechanism comprises a powder supply frame, a power mechanism and an ejector, and the ejector is used for respectively spraying and processing the surface of the workpiece. This patent is through the sprayer to the spraying processing of work piece surface, and it is big to try to solve many equipment assembly area, the difficult, the big problem of operation workman's quantity of multiple operation connection, but the sprayer in this patent is a linear array, need constantly drive sprayer cyclic reciprocating motion through power unit, just can solve the even problem of product spraying, and its structure is comparatively complicated, breaks down easily, and the power consumption cost is also high.

Another kind of current has single spraying equipment of many shower nozzles, respectively at the top, the bottom sets up one row of shower nozzle, the product passes through from the centre of two rows of shower nozzles, the benefit of bringing is the promotion of spraying efficiency, however, the coating powder that the top shower nozzle erupted receives the action of gravity will condense together with the coating powder that the bottom shower nozzle erupted, coating powder volume has big or small on the one hand, the coating layer thickness that obtains on attaching to the product is inhomogeneous, influence the roughness on product surface, lead to the defective percentage to rise, the coating powder that the on the other hand shower nozzle erupted condenses together falling speed and accelerates, the time of dwell in the air is short, make coating powder can not fully just fall to the ground with product surface contact, cause the waste of coating.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model aims to provide an electrostatic spraying equipment and electrostatic spraying system aims at solving current electrostatic spraying equipment and evenly adopts complicated structure, breaks down easily, the power consumption cost is also high or the roughness of spraying product is high inadequately, the extravagant problem of coating for the spraying.

The purpose of the utility model is realized by adopting the following technical scheme:

an electrostatic spraying device comprises a device body and N spray heads respectively connected with the device body, wherein N is an integer not less than 3, and the N spray heads are sequentially arranged on any side of a moving path close to a sprayed product;

at least the projection of the connecting line between the adjacent three spray heads on the horizontal plane forms a triangle.

On the basis of the above embodiment, it is preferable that at least two heads among the N heads have different heights.

On the basis of any of the above embodiments, preferably, projections of connecting lines among the p-1 th nozzle, the p-th nozzle and the p +1 th nozzle on a horizontal plane form an obtuse isosceles triangle, an angle corresponding to the p-th nozzle is an obtuse angle, and p is an integer greater than 1 and less than N.

On the basis of any of the above embodiments, preferably, the N nozzles are alternately disposed on two sides of the moving path close to the product to be sprayed, and the projections of the N nozzles on the horizontal plane are located on two parallel straight lines.

On the basis of any of the above embodiments, preferably, the electrostatic spraying apparatus is a DISK electrostatic spraying apparatus.

In any of the above embodiments, preferably, N is 3;

the projections of the connecting lines among the first spray head, the second spray head and the third spray head on the horizontal plane form a triangle.

An electrostatic spraying system comprising a suspension chain and an electrostatic spraying device as in any one of the embodiments above;

the product is hung on the hanging chain and sequentially passes through the spraying areas of the N spray heads along with the hanging chain;

the projections of the connecting lines among the (q-1) th sprayer, the (q) th sprayer and the (q + 1) th sprayer on the horizontal plane form a triangle;

when passing through the spraying area of the qth spray head, the moving path of the product is as follows:

and the water enters between the qth spray head and the qth spray head from the position between the qth spray head and through the side of the qth spray head, which is far away from the qth spray head and the qth spray head, wherein q is an integer which is more than 1 and less than N.

On the basis of the above embodiment, it is preferable that the moving path of the product sprayed on the suspension chain when passing through the spraying area of the N spraying heads is:

a combination of straight lines; alternatively, the first and second electrodes may be,

an arc or combination of arcs; alternatively, the first and second electrodes may be,

a combination of straight and curved.

On the basis of any of the above embodiments, preferably, the drying device further comprises a preheating device, a drying device and a cleaning device;

the preheating equipment, the electrostatic spraying equipment, the drying equipment and the cleaning equipment are sequentially connected;

the suspension chain sequentially passes through the preheating equipment, the electrostatic spraying equipment, the drying equipment and the cleaning equipment.

On the basis of any of the above embodiments, it is preferable that at least one first spray booth and/or at least one second spray booth are further included, the first spray booth is used for pre-spraying the sprayed product before spraying by the electrostatic spraying device, and the second spray booth is used for supplementing the sprayed product after spraying by the electrostatic spraying device.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses an electrostatic spraying equipment and electrostatic spraying system, this electrostatic spraying equipment is provided with at least three shower nozzle, the projection at the horizontal plane of line between the three adjacent shower nozzle forms triangle-shaped at least, for setting up the shower nozzle respectively in top, the way of bottom, the coating powder that has reduced the top shower nozzle and jetted receives the coating powder that the action of gravity and the bottom shower nozzle jetted and condenses the condition together, the coating powder volume in the air is more close, on adhering to the product surface, the coating layer thickness that obtains is more even, the roughness is higher, the defective percentage brought of surface unevenness has been reduced; because the coating powder is light and stays in the air for a longer time than after being condensed together, the coating powder can contact the surface of the product for more time and can be attached to the surface of the product more, and the waste of the coating is reduced. Products to be sprayed sequentially pass through the spraying areas of the spray heads along the suspension chains, so that the spraying is more uniform than that of a fixed linear multi-spray-head structure; and compare in the many shower nozzle structures of linear type of reciprocating type removal, the utility model discloses a structure is comparatively simple, consequently is difficult for breaking down, and equipment cost is lower, and installation, maintenance, repair, power consumption cost are also low. The equipment has low operating technical requirements for users, and particularly has high technical requirements for spraying. In addition, the equipment saves space, the spraying process has good consistency, uninterrupted production can be carried out, the applicable product variety range is wide, and the controllability is extremely high especially for products with complex surface shapes.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1a is a schematic structural diagram of an electrostatic spraying device according to one embodiment;

FIG. 1b is a schematic structural diagram of an electrostatic spraying device according to one embodiment;

FIG. 1c is a schematic structural diagram of an electrostatic spraying apparatus according to an embodiment;

FIG. 2a is a schematic structural diagram of an electrostatic spraying apparatus according to a second embodiment;

FIG. 2b is a schematic structural diagram of an electrostatic spraying apparatus according to a second embodiment;

FIG. 2c is a schematic structural diagram of an electrostatic spraying apparatus according to a second embodiment;

FIG. 3a is a schematic structural diagram of an electrostatic spraying apparatus according to a third embodiment;

FIG. 3b is a schematic structural diagram of an electrostatic spraying apparatus according to a third embodiment;

FIG. 3c is a schematic structural diagram of an electrostatic spraying apparatus according to a third embodiment;

FIG. 3d is a schematic structural diagram of an electrostatic spraying apparatus according to a third embodiment;

FIG. 3e is a schematic structural diagram of an electrostatic spraying system according to a third embodiment;

FIG. 3f is a schematic partial cross-sectional view of a spray product according to a third embodiment;

FIG. 3g shows a schematic partial cross-sectional view of another spray product provided in accordance with example three.

In the figure: 1. a first nozzle; 2. a second nozzle; 3. a third spray head; 4. a fourth nozzle; 5. a fifth spray head; 6. a sixth spray head; 7. a seventh nozzle; 101. preheating equipment; 102. an electrostatic spraying device; 103. a drying device; 104. cleaning equipment; 105. a suspension chain; 1061. a first spray room; 1062. a second spray room; s1, a first surface; s2, a second surface; l11, first coating layer of first surface; l12, second coating layer of first surface; l13, third coating layer of first surface; l14, fourth coating layer of the first surface; l21, first coating layer of second surface; l22, second coating layer of second surface; l23, third coating layer of second surface; l24, fourth coating layer of second surface.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

Detailed description of the preferred embodiment

As shown in fig. 1a, 1b, and 1c, an embodiment of the present invention provides an electrostatic spraying apparatus 102, which includes an apparatus body (not shown), a first nozzle 1, a second nozzle 2, and a third nozzle 3, where the first nozzle 1, the second nozzle 2, and the third nozzle 3 are respectively connected to the apparatus body.

The embodiment of the utility model provides a can be applied to multiple fields that need the spraying technique such as cooking utensil field.

The embodiment of the utility model provides an in the product, can be the arbitrary kind product of needs spraying. Including various types of cookware. The embodiment of the utility model provides a do not restrict the material of cooking utensil, it can be enamel cooking utensil, also can be ceramic cooking utensil. The matrix material of the enamel cooker can be cast iron with iron content over 65 percent. In a preferred case, the matrix material of the enamel cooker can be one or more of gray cast iron, nodular cast iron and vermicular cast iron.

The coating powder sprayed by any one of the spray heads can be any one of the coating powders. The coating powder sprayed by the three spray heads can be the same, or different between any two spray heads, or the coating powder sprayed by partial spray heads is the same, or the coating powder sprayed by partial spray heads is different, and the coating powder can be selected according to the requirements in practical application. Particularly, the paint powder sprayed by the preset three spray heads has different colors and materials, so that the surface of the product can present an artistic multi-level visual effect.

When the cookware is sprayed, the sprayed coating can be glaze with various colors.

The first nozzle 1, the second nozzle 2 and the third nozzle 3 are sequentially arranged at any side of a moving path close to a product to be sprayed. By using one side of the moving path of the product to be sprayed as the first side and the other side of the moving path of the product to be sprayed as the second side, the first nozzle 1, the second nozzle 2, and the third nozzle 3 may be all disposed on the first side or the second side of the moving path of the product to be sprayed, or a part of the nozzles may be disposed on the first side and a part of the nozzles may be disposed on the second side.

The projections of connecting lines among the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane can form a triangle, the projections of any two nozzles on the horizontal plane are not overlapped, compared with the method that the nozzles are respectively arranged at the top and the bottom, the method reduces the condition that coating powder sprayed by the top nozzle is condensed together under the action of gravity and coating powder sprayed by the bottom nozzle, the volumes of the coating powder in the air are relatively close and attached to the surface of a product, the thickness of the obtained coating layer is relatively uniform, the flatness is relatively high, and the defective rate caused by uneven surface is reduced; because the coating powder is light and stays in the air for a longer time than after being condensed together, the coating powder can contact the surface of the product for more time and can be attached to the surface of the product more, and the waste of the coating is reduced. Products to be sprayed sequentially pass through the spraying areas of the spray heads along the suspension chain 105, so that the spraying is more uniform than that of a fixed linear multi-spray-head structure; and compare in the many shower nozzle structures of reciprocating type linear type that removes of circulation, the utility model discloses the structure is comparatively simple, consequently is difficult for breaking down, and equipment cost is lower, and installation, maintenance, repair, power consumption cost are also low.

In the first nozzle 1, the second nozzle 2, and the third nozzle 3, the heights of the first nozzle 1, the second nozzle 2, and the third nozzle 3 may be equal, or the heights of the first nozzle 1 and the second nozzle 2 may be different, or the heights of the first nozzle 1 and the third nozzle 3 may be different, or the heights of the second nozzle 2 and the third nozzle 3 may be different, or the heights of the first nozzle 1, the second nozzle 2, and the third nozzle 3 may be different. For products with larger sizes, when multiple spray heads with equal heights are combined, some parts of the products are always closer to the spray heads, and other parts of the products are always farther from the spray heads, so that uneven spraying is caused; when the multiple spray heads with different heights are combined, because the different spray heads have different heights, when the product passes through the whole spraying area, different parts of the product can be closer to the spray heads, so that all parts of the product can be more fully contacted with the coating powder sprayed by the spray heads, and the spraying effect of the product is more uniform. For example, when the product length is long, part of the spray heads may be disposed at a higher position and part of the spray heads may be disposed at a lower position.

The projections of the connecting lines among the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane can form an isosceles triangle. For example, the distance between the projections of the first spray head 1 and the second spray head 2 on the horizontal plane is equal to the distance between the projections of the second spray head 2 and the third spray head 3 on the horizontal plane. At this time, if the suspension chain 105 passes through the spraying areas of the first nozzle 1, the second nozzle 2 and the third nozzle 3 at a uniform speed, a very uniform spraying effect can be achieved.

The projections of the connecting lines among the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane can form an acute triangle, a right triangle or an obtuse triangle. When the projections of the connecting lines among the first spray head 1, the second spray head 2 and the third spray head 3 on the horizontal plane form an obtuse triangle, the spray heads can have larger distance on the premise of limited occupied space, and the condition that coating powder sprayed by different spray heads is condensed together is reduced.

As shown in fig. 1a, the projections of the connecting lines between the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane may form an acute isosceles triangle. The projections of the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane can be equilateral triangles.

As shown in fig. 1b, the projections of the connecting lines between the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane may form a right isosceles triangle.

As shown in fig. 1c, the projections of the connecting lines between the first nozzle 1, the second nozzle 2 and the third nozzle 3 on the horizontal plane may form an obtuse isosceles triangle.

When the number of spray heads is large, the embodiment of the present invention may also combine a plurality of single electrostatic spraying apparatuses 102 for use. At this time, a single electrostatic spraying device 102 can be regarded as a modular spraying unit, and the modular spraying units are arranged and combined into the electrostatic spraying device 102 with a plurality of spray heads according to a certain rule, so that the modular spraying units are convenient to transport compared with a large single electrostatic spraying device 102, and the arrangement mode of the modular spraying units can be adjusted according to the use requirement, so that the spraying process can be adjusted.

The electrostatic spraying device 102 in the embodiment of the present invention may be a DISK electrostatic spraying device 102. DISK spraying is also called omega vertical disc spraying, is one kind of electrostatic spraying, utilizes centrifugal force and electrostatic field effect that the shower nozzle high-speed rotation produced, throws away the coating liquid droplet of atomizing, because there is voltage between shower nozzle and the product, the coating liquid droplet of throwing away is just adsorbed on the product surface, therefore atomization effect is good, spraying efficiency is high.

Detailed description of the invention

As shown in fig. 2a, the embodiment of the present invention provides an electrostatic spraying device 102, which includes a device body and N nozzles, where N is an integer not less than 3, and each nozzle is connected to the device body respectively.

The N spray heads are used for spraying coating powder. The coating powder sprayed by any one of the spray heads can be any one of the coating powders. The coating powder sprayed by the N spray heads can be the same, or different between any two spray heads, or the coating powder sprayed by partial spray heads is the same, or the coating powder sprayed by partial spray heads is different, and the coating powder can be selected according to the requirements in practical application.

The N spray heads are sequentially arranged on any side of a moving path close to a product to be sprayed. By taking one side of the moving path of the sprayed product as a first side and the other side of the moving path of the sprayed product as a second side, the N spray heads may be all disposed on the first side or the second side of the moving path of the sprayed product, or a part of the spray heads may be disposed on the first side and a part of the spray heads may be disposed on the second side.

When N is 3, the electrostatic spraying device 102 is as shown in the first embodiment.

When N is larger than or equal to 4, the electrostatic spraying equipment 102 is provided with at least four spray heads, and the projection of the connecting line between at least three adjacent spray heads on the horizontal plane forms a triangle.

In the electrostatic spraying apparatus 102, a projection of a connecting line between adjacent three spray heads on a horizontal plane may form a triangle, and the group of adjacent three spray heads may be disposed at any position in all spray heads.

In the electrostatic spraying apparatus 102, projections of connecting lines between two or more groups of three adjacent nozzles on a horizontal plane may form a triangle. Each set of three adjacent spray heads can be arranged at any position in all spray heads.

When the projections of the connecting lines between two or more groups of adjacent three sprayers on the horizontal plane form a triangle, different three sprayer combinations forming the triangle can be adjacent or nonadjacent. For example, in the ten-head electrostatic spraying apparatus 102, the projections of the third head 3, the fourth head 4, and the fifth head 5 on the horizontal plane may be triangular, and the projections of the seventh head 7, the eighth head, and the ninth head on the horizontal plane may be triangular.

If the projection of the connecting line among the (p-1) th spray head, the (p) th spray head and the (p + 1) th spray head on the horizontal plane forms a triangle, the triangle can be an isosceles triangle, and p is an integer which is more than 1 and less than N. Specifically, the shape of the isosceles triangle can be an acute angle isosceles triangle, a right angle isosceles triangle or an obtuse angle isosceles triangle. At this time, the other nozzles may be arranged in any shape, for example, in a linear arrangement, a zigzag arrangement, or a hexagonal arrangement, or other group or groups of adjacent three nozzles may form a triangle in projection on the horizontal plane.

The N spray heads can be arranged at the same height or different heights, for example, at least two spray heads have different heights. All the spray heads may be arranged at different heights, or some of the spray heads may be arranged at the same height at intervals. For example, the first, fifth, ninth, … …, and 4m +1 th heads 1, 5, 7, eleventh, … …, and 4m +3 th heads may be disposed at a higher level, and the third, seventh, and 4m +3 th heads may be disposed at a lower level; correspondingly, the second spray head 2, the sixth spray head 6, the tenth spray head, … … and the 4m +2 spray head are arranged at a higher height, and the fourth spray head 4, the eighth spray head, the twelfth spray head, … … and the 4m +4 spray head are arranged at a lower height; m is any positive integer, and 4m +4 is not more than N.

The projection of the N nozzles on the horizontal plane can be irregular fold line shape as shown in FIG. 2 b.

In a preferred case, the N nozzles are alternately arranged on two sides of the moving path close to the product to be sprayed, and the projections of the N nozzles on the horizontal plane are located on two parallel straight lines, as shown in fig. 2 a. The advantages of this are simple structure, low cost of equipment, easy installation, maintenance and repair.

Specifically, if N is an odd number, then: the projection of the connecting line among the first spray head 1, the third spray head 3, … … and the Nth spray head on the horizontal plane forms a first straight line; the projection of the connecting line among the second spray head 2, the fourth spray head 4, … … and the (N-1) th spray head on the horizontal plane forms a second straight line; the first straight line and the second straight line are parallel.

Or, if N is an even number: the projection of the connecting line among the first spray head 1, the third spray head 3, … … and the N-1 spray head on the horizontal plane forms a first straight line; the projections of the connecting lines among the second spray head 2, the fourth spray head 4, … … and the Nth spray head on the horizontal plane form a second straight line; the first straight line and the second straight line are parallel.

As shown in fig. 2c, when N is 4, the projections of the first, second, third, and

fourth nozzles

1, 2, 3, and 4 on the horizontal plane may be parallelograms.

As shown in fig. 2a, the spray device has 7 spray heads. The projection of the connecting line between any three adjacent spray heads on the horizontal plane forms an obtuse isosceles triangle. The projection of the connecting line between any four adjacent spray heads on the horizontal plane forms a parallelogram.

Detailed description of the preferred embodiment

An embodiment of the present invention provides an electrostatic spraying system, which includes a suspension chain 105 and an electrostatic spraying device 102 according to the first embodiment or the second embodiment.

As shown in fig. 3a, 3b, 3c, and 3d, the product is hung on the hanging chain 105, and passes through the spraying areas of the N spraying heads sequentially with the hanging chain 105.

The projections of the connecting lines among the adjacent q-1 th sprayer, the q-1 th sprayer and the q +1 th sprayer on the horizontal plane form a triangle. When passing through the spraying area of the qth spray head, the moving path of the product is as follows: and the water enters between the qth spray head and the qth spray head from the position between the qth spray head and through the side of the qth spray head, which is far away from the qth spray head and the qth spray head, wherein q is an integer which is more than 1 and less than N. The path of travel of the product through the spray area of the qth spray head now approximates an S-shape. Compared with the condition that the product directly enters between the qth spray head and the qth spray head from the position between the qth spray head and the qth spray head, the path length of the product passing through the spraying area of the qth spray head is longer on the premise that the distance between the qth spray head and the qth spray head is not changed; on the premise of keeping the moving speed unchanged, the product passes through the spraying area for a longer time, so that the contact time between the surface of the product and the coating powder can be prolonged in a limited length space, the quantity of the coating powder attached to the surface of the product is increased, and the spraying efficiency is higher.

In a preferred case, the movement path of the product sprayed on the suspension chain 105 when passing through the spraying area of the N spraying heads may be:

entering between the first spray head 1 and the second spray head 2 from one side of the first spray head 1 far away from the second spray head 2;

the water enters between the second spray head 2 and the third spray head 3 through the side of the second spray head 2 far away from the first spray head 1;

……

the water enters between the kth spray head and the kth +1 spray head through the side of the kth spray head, which is far away from the kth-1 spray head;

……

the water enters between the N-1 spray head and the Nth spray head through the side of the N-1 spray head far away from the N-2 spray head;

passes through the side of the Nth spray head far away from the (N-1) th spray head; k is an integer, k is 2, 3, … …, N-1.

At the moment, when the product passes through the spraying area of any spray head, the moving path of the product is similar to an S shape and enters between the current spray head and the next spray head from the position between the current spray head and the previous spray head and through the side of the current spray head far away from the previous spray head.

For example, for a four-jet electrostatic spray system, it may include a suspension chain 105 and first through fourth jets 1 through 4. The suspension chain 105 passes through the spraying area with 4 spray heads, and the moving path of the product sprayed on the suspension chain 105 can be as follows:

the water enters between the third spray head 3 and the fourth spray head 4 through the side of the third spray head 3 far away from the second spray head 2;

passes through the side of the fourth nozzle 4 remote from the (N-1) th nozzle.

When the product passes through a spraying area of a certain spray head except the qth spray head, the moving path of the product can be as follows: entering between the t-1 spray head and the t +1 spray head from the position between the t-1 spray head and the t-1 spray head; t is an integer greater than 1 and less than N, and t ≠ q. At the moment, the t-1 th spray head and the t +1 th spray head are arranged at two sides of the moving path of the product in a staggered way, the t-1 th spray head and the t +1 th spray head are arranged at the same side, and the t-th spray head is arranged at the other side. Compare in the condition that the (t-1) th shower nozzle, the (t + 1) th shower nozzle, all set up in removal route unilateral, the distance that can increase between the shower nozzle under the unchangeable prerequisite of removal route length, shower nozzle quantity is not changed to two side crisscross shower nozzles that set up, avoids the coating that the shower nozzle jetted to condense together, leads to the coating layer on spraying product surface inhomogeneous, level and smooth.

The movement path of the product being sprayed on the suspension chain 105 may be any combination of straight lines as it passes through the spraying zones of the N spray heads; or, any arc or combination of arcs; or any combination of straight and curved.

The moving path of the product through the spraying area of the N spray heads can be an unclosed two-dimensional curve or a three-dimensional curve, and preferably can be an arc or a combination of arc sections, and the spray heads are positioned on one side of the arc. More spray heads can be placed on the premise that the linear distance is unchanged and the spray head interval is unchanged, and the spraying frequency of the product is increased in the limited linear distance. The path of movement of the product may approximate a sine curve or a cosine curve. As shown in fig. 3a, the path of travel of the product being sprayed on the suspension chain 105 may be in the form of an arc of a length that is joined end to end. As a special case of an arc, the path of travel of the product being sprayed on the suspension chain 105 may also be a segment of a semi-circle, end to end.

As shown in fig. 3b, the moving path of the product through the spraying area can also be a combination of straight line and arc, which is adjusted according to the performance requirement and cost requirement in practical application. For example, where the need for spray efficiency is paramount, more arcs may be used to increase the time for the product to pass through the spray area. More straight lines may be used to reduce product diversion in order to avoid product wear or when the product is a fragile product. As a special case of the arc shape, the movement path of the product sprayed on the suspension chain 105 can also be a combination of straight and semi-circular, as shown in fig. 2 a.

The moving path of the product passing through the spraying areas of the N nozzles can be a straight line, the moving path of the product passing through the spraying areas of the nozzles is the shortest, and for some products which need to be lightly handled and placed to avoid scratch or are fragile when the moving amplitude is large, the turning is reduced, the moving path is shortened, and the product can be guaranteed not to be damaged to the maximum extent.

The moving path of the product through the spraying area of the N spray heads can also be a broken line, namely a combination of a section of straight line. The polyline may be a regular polyline, as shown in FIG. 3 c. The fold line may also be a random fold line, as shown in fig. 3 d. Preferably, at the intersection of two straight lines, in order to reduce the product jolt, a smooth transition of arc line may be selected.

The product in the embodiment of the present invention may have a first surface S1, a second surface S2. When passing through the spraying area of a certain spray head, the first surface S1 or the second surface S2 may be always faced to the spray head.

The two surfaces face the spray heads respectively, so that the coating layer with a certain thickness can be sprayed on each surface, and the times of the two surfaces facing the spray heads can be adjusted according to the requirements in actual use, so that the electrostatic spraying system is suitable for spraying products with different coating layer thickness requirements on different surfaces and is also suitable for spraying products with the same coating layer thickness requirements on different surfaces.

After spraying, the first surface S1 and the second surface S2 form paint layers respectively. In actual production, the ratio m of the expected thickness of the paint layer of the first surface S1 to the expected thickness of the paint layer of the second surface S2 can be obtained according to the paint layer thickness requirements of the first surface S1 and the second surface S2. m > 1, indicating that the desired thickness of the paint layer of the first surface S1 is higher than the desired thickness of the paint layer of the second surface S2. m < 1, indicating that the desired thickness of the paint layer of the first surface S1 is lower than the desired thickness of the paint layer of the second surface S2. m ═ 1, indicates that the desired thickness of the paint layer of the first surface S1 is the same as the desired thickness of the paint layer of the second surface S2.

When the spraying area passes through the N spray heads, the frequency that the first surface S1 faces the spray heads is N1, the frequency that the second surface S2 faces the spray heads is N2, and N1+ N2 is not more than N. When N1+ N2 is N, either the first surface S1 faces the head or the second surface S2 faces the head. When N1+ N2 < N, neither the first surface S1 nor the second surface S2 faces the heads when passing through the spray area of some heads.

In the process of spraying the product by using the N spray heads, N1/N2 can be m, and the product passes through the spraying areas of the N spray heads at a constant speed, and the time of passing through the spraying areas of each spray head is the same. At this time, the thickness of the paint layer sprayed when the first surface S1 or the second surface S2 passes through the spraying region of one spray head is the same, and the greater the number of times of facing the spray head, the thicker the thickness of the resulting paint layer. If the first surface S1 faces the head 2 times as many times as the second surface S2, the first surface S1 obtains a thickness of the paint layer approximately 2 times as much as the second surface S2. If the number of times the first surface S1 faces the head is one-half of that of the second surface S2, the first surface S1 obtains a thickness of the paint layer that is approximately one-half of that of the second surface S2.

A spraying process of a product with different thickness requirements of coating layers on different surfaces can be as shown in fig. 1a, wherein the product to be sprayed sequentially passes through spraying areas of a first spray head 1, a second spray head 2 and a third spray head 3 along with a suspension chain 105, and spraying products with different thickness of coating layers on different surfaces are obtained.

The moving path of the product is as follows: from between first shower nozzle 1, second shower nozzle 2, through the second shower nozzle 2 and keep away from one side of first shower nozzle 1, get into between second shower nozzle 2, third shower nozzle 3. After passing through the spraying area of the first spray head 1, a first coating layer is formed on the surface of the product; after passing through the spraying area of the second spray head 2, a second coating layer is formed on the surface of the product; after passing through the spraying area of the third spray head 3, a third coating layer is formed on the surface of the product; the first coating layer, the second coating layer and the third coating layer are sequentially arranged on the surface of a product from inside to outside to jointly form the coating layers. As shown in fig. 3f, a first coating layer L11, a second coating layer L12 and a third coating layer L13 are sequentially disposed on the first surface S1 from inside to outside, and a first coating layer L21, a second coating layer L22 and a third coating layer L23 are sequentially disposed on the second surface S2 from inside to outside.

The process of spraying the product comprises:

the preheated product is sprayed for the first time by the first spray head 1, when the product passes through the spraying area of the first spray head 1, the first surface S1 faces the direction of the first spray head 1, so that the first surface S1 is sprayed more fully, and a first coating layer L11 formed on the first surface S1 by the first spray head 1 is thicker than a first coating layer L21 formed on the second surface S2 by the first spray head 1;

performing secondary spraying on the product subjected to the primary spraying by using the second spray head 2, wherein when the product passes through a spraying area of the second spray head 2, the second surface S2 faces the direction of the second spray head 2, so that the second surface S2 is sprayed more fully, and a second coating layer L22 formed on the second surface S2 by the second spray head 2 is thicker than a second coating layer L12 formed on the first surface S1 by the second spray head 2;

and (3) performing third spraying on the product after the second spraying by using the third spray head 3, wherein when the product passes through the spraying area of the third spray head 3, the first surface S1 faces the direction of the third spray head 3, so that the first surface S1 is sprayed more fully, and a third coating layer L13 formed by the third spray head 3 on the first surface S1 is thicker than a third coating layer L23 formed by the third spray head 3 on the second surface S2.

In a preferred case, the first paint layer L11 of the first surface of the spray-coated product has the same thickness as the second paint layer L22 of the second surface, and the second paint layer L12 of the first surface has the same thickness as the first paint layer L21 of the second surface.

In a preferable case, the first surface S1 faces the spray head the same number of times as the second surface S2 faces the spray head when passing through the spray areas of the N spray heads. The thicknesses of the coating layers on the two surfaces can be closer to each other than when the first surface S1 and the second surface S2 face the nozzle head at different times.

In a more preferred case, m is 1, N is an even number, and the first surface S1 and the second surface S2 alternately face the spray head when passing through the spray area of the N spray heads, where N1 is N2 is N/2, and the thickness of the paint layer obtained from the first surface S1 is substantially the same as that of the second surface S2. For example, the first surface S1 faces the heads when passing through the first head 1, the third head 3, the fifth head 5, and the seventh head 7, … …, and the second surface S2 faces the heads when passing through the second head 2, the fourth head 4, the sixth head 6, the eighth head, and … …. The advantage of this is that the thicknesses of the coating layers on the first surface S1 and the second surface S2 are similar, and the increasing speeds of the thicknesses of the coating layers on the two surfaces are synchronous, so that for a product with the first surface S1 and the second surface S2 being approximately symmetrical, the situation that the gravity center of the product shifts towards the surfaces and the product on the suspension chain 105 tilts or even topples due to the thicker coating layer on one surface can be reduced.

A product spraying process with the same coating layer thickness requirement for different surfaces can be shown in fig. 3a, when the product passes through the spraying areas of the first spray head 1 and the third spray head 3, the first surface S1 faces the spray heads; when the product passes through the spraying areas of the second and fourth spray heads 2 and 4, the second surface S2 faces the spray heads. The product to be sprayed sequentially passes through the spraying areas of the first spray head 1, the second spray head 2, the third spray head 3 and the fourth spray head 4 along with the suspension chain 105, and the sprayed products with the same coating layer thickness on different surfaces are obtained. The first coating layer, the second coating layer, the third coating layer and the fourth coating layer are sequentially arranged on the surface of a product from inside to outside to jointly form the coating layers. As shown in fig. 3g, a first coating layer L11, a second coating layer L12, a third coating layer L13, and a fourth coating layer L14 are sequentially disposed on the first surface S1 from inside to outside, and a first coating layer L21, a second coating layer L22, a third coating layer L23, and a fourth coating layer L24 are sequentially disposed on the second surface S2 from inside to outside.

In a preferable case, the first coating layer L11 on the first surface is thicker than the first coating layer L21 on the second surface, the second coating layer L22 on the second surface is thicker than the second coating layer L12 on the first surface, the third coating layer L13 on the first surface is thicker than the third coating layer L23 on the second surface, and the fourth coating layer L24 on the second surface is thicker than the fourth coating layer L14 on the first surface, and after passing through the spraying areas of the first spray head 1, the second spray head 2, the third spray head 3, and the fourth spray head 4, the total thicknesses of the coating layers on the first surface S1 and the second surface S2 are closer.

In a preferred case, the thickness of the first paint layer L11 of the first surface of the spray-coated product is the same as the thickness of the second paint layer L22 of the second surface, the thickness of the second paint layer L12 of the first surface is the same as the thickness of the first paint layer L21 of the second surface, the thickness of the third paint layer L13 of the first surface is the same as the thickness of the fourth paint layer L24 of the second surface, and the thickness of the fourth paint layer L14 of the first surface is the same as the thickness of the third paint layer L23 of the second surface.

In a preferred aspect, the thicknesses of L11, L13, L22 and L24 are the same, and the thicknesses of L12, L14, L21 and L23 are the same.

As shown in fig. 3e, the electrostatic spraying system may further include a preheating device 101, a drying device 103, and a cleaning device 104, where the preheating device 101, the electrostatic spraying device 102, the drying device 103, and the cleaning device 104 are connected in sequence, and these devices may be all automated devices.

The suspension chain 105 on which the product is suspended passes through the preheating device 101, the electrostatic spraying device 102, the drying device 103, and the cleaning device 104 in this order.

The preheating device 101 can preheat the product on the suspension chain 105. The product is preheated, so that the moisture and the humidity on the surface of the product can be eliminated, and the interface temperature of the coating powder sprayed by the spray head when the coating powder is in contact with the surface of the product is improved, so that the bonding strength of the coating layer and the surface of the product is improved, the condition that the coating layer is not firm due to stress caused by the thermal expansion difference between the surface of the product and the coating powder is reduced, and the spraying effect is better.

The preheating temperature depends on the size, shape and material of the product, the area of the surface of the product, the thermal expansion coefficient of the surface of the product and the coating powder, and other factors. If the preheating temperature is too high, the sprayed coating can become dry powder, and if the preheating temperature is too low, the adhesion of the product is small, and the flowability of the coating is high. When the sprayed product is an enamel cooker or a ceramic cooker and the sprayed coating is glaze, the product can be at the temperature of 10-58 ℃ in the process of preheating the product on the suspension chain 105, and the preheating time can be 1-15 minutes. The temperature and the time are suitable for enamel cookers and ceramic cookers, and the preheating effect is most suitable for the requirements in practical application.

In a preferred aspect, the preheating may be carried out such that the product is at a temperature of 25-45 ℃ and the preheating time may be 2-8 minutes. Wherein, the preheating time can be further shortened to 2-5 minutes to improve the preheating efficiency. The preheating temperature and time correspond to the subsequent spraying, so that the bonding strength of the glaze and the surface of the enamel cooker or the ceramic cooker can be optimized.

The embodiment of the utility model provides a can adopt the preheater to preheat the product, the preheater communicates with each other with the outside air, is dry ordinary air in the stove.

The electrostatic spraying device 102 may electrostatically spray the preheated product. When the electrostatic spray device 102 is a DISK electrostatic spray device 102, the DISK electrostatic spray may be applied to the product on the suspension chain 105.

According to the empirical data related to electrostatic spraying and the requirements of specific practical application, the product can be pre-sprayed before spraying and/or the product can be re-sprayed after spraying for dead corners which are difficult to spray on the surface of the product or parts which are frequently not sufficiently sprayed.

At least one first spray booth 1061 may be provided between the preheating apparatus 101 and the electrostatic spraying apparatus 102 for pre-spraying the product on the hanging chain 105 prior to electrostatic spraying. The number of the first spray rooms 1061 may be 1 or more. Any one of the first spray booths 1061 may be disposed on any one side of the moving path of the product to be sprayed on the suspension chain 105.

At least one second spray booth 1062 may be provided between the electrostatic spray apparatus 102 and the drying apparatus 103 for replenishing the defective products sprayed on the hanging chain 105 after electrostatic spraying. The number of the second spray rooms 1062 may be 1 or more. Any one of the second spray booths 1062 may be disposed on any one side of the moving path of the product to be sprayed on the suspension chain 105.

The first spray booth 1061 and the second spray booth 1062 may be disposed on the same side of the suspension chain 105, or may be disposed on both sides of the suspension chain 105.

The pre-spraying and/or the supplementary spraying can be finished manually or by automatic spraying equipment with a detection function. The first spray booth 1061 and the second spray booth 1062 may be manual spray booths or automatic spray equipment having a detection function. The advantage of manual spraying is that workers in the manual spraying room are used as the assistance of automatic spraying, so that the situation that some dead corners are not sprayed in place after spraying is finished is avoided.

For example, the two sides of the moving path of the product to be sprayed on the suspension chain 105 passing through the electrostatic spraying apparatus 102 are the first side and the second side, and the positional relationship among the electrostatic spraying apparatus 102, the first spraying room 1061 and the second spraying room 1062 on the moving path of the product to be sprayed may be arranged in the following order:

1) a first spray booth 1061 located at the first side, an electrostatic spray device 102, a second spray booth 1062 located at the first side;

2) a first spray booth 1061 located at the second side, an electrostatic spray device 102, a second spray booth 1062 located at the first side;

3) a first spray booth 1061 located at a first side, an electrostatic spray device 102, a second spray booth 1062 located at a second side;

4) a first spray booth 1061 located at the second side, an electrostatic spraying apparatus 102, and a second spray booth 1062 located at the second side.

The drying device 103 may dry the sprayed product. The drying apparatus 103 may be an elongated drying oven. The drying oven can be in any shape, and can be in a linear type or a curve type. For example, the drying oven may be U-shaped, S-shaped, L-shaped, M-shaped or N-shaped. When the sprayed product is an enamel cooker or a ceramic cooker and the sprayed coating is a glaze, the product can be at the temperature of 150-280 ℃ in the process of drying the product, and the drying time can be 5-28 minutes. The temperature and time are suitable for enamel cookers and ceramic cookers, and the drying effect best meets the requirements in practical application.

In a preferred case, the product may be dried at a temperature of 170-225 ℃ for a time of 10-15 minutes, which optimizes the bonding strength of the glaze to the surface of the enamel or ceramic cookware.

The cleaning device 104 may clean the dried product. Therefore, the product can be cleaned as soon as possible, and meanwhile, whether the part which is not sprayed in place still exists on the surface of the product can be conveniently observed after cleaning is finished, and the supplementary spraying is carried out again.

After cleaning is complete, the product on the hanging chain 105 may be removed.

The suspension chain 105 can then be suspended with a new product to be sprayed, again entering the preheating device 101.

The utility model discloses from the use purpose, in efficiency, point of view such as progress and novelty explains, the practical progressive nature that it has accords with the function enhancement and the use essential that the patent law emphasizes, the above description and the attached drawing of the utility model only are the preferred embodiment of the utility model has, do not limit with this the utility model discloses, consequently, all with the utility model discloses the structure, device, characteristics etc. are similar, identical, all should belong to in accordance with the equivalent replacement or the modification etc. that the patent application scope of the utility model made promptly, all should belong to within the scope of the patent application protection of the utility model.

Claims

1. An electrostatic spraying device comprises a device body and N spray heads respectively connected with the device body, wherein N is an integer not less than 3, and the electrostatic spraying device is characterized in that the N spray heads are sequentially arranged on any side of a moving path close to a product to be sprayed;

2. An electrostatic spraying device as claimed in claim 1, wherein at least two of the N spray heads have different heights.

3. The electrostatic spraying apparatus according to claim 1, wherein a projection of a connecting line between the p-1 th nozzle, the p-th nozzle, and the p +1 th nozzle on a horizontal plane forms an obtuse isosceles triangle, an angle corresponding to the p-th nozzle is an obtuse angle, and p is an integer greater than 1 and less than N.

4. An electrostatic spraying device as claimed in claim 1, characterized in that the N spraying heads are arranged alternately close to the two sides of the path of movement of the product to be sprayed, and the projections of the N spraying heads onto the horizontal plane are located on two mutually parallel straight lines.

5. The electrostatic spraying device of claim 1 wherein the electrostatic spraying device is a DISK electrostatic spraying device.

6. An electrostatic spraying device as claimed in claim 1, wherein N-3;

7. An electrostatic spraying system comprising a suspension chain and an electrostatic spraying device according to any one of claims 1 to 6;

8. The electrostatic spraying system of claim 7 wherein the path of travel of the product being sprayed on the suspension chain as it passes through the spraying region of the N spray heads is:

a combination of straight and curved.

9. The electrostatic spraying system according to claim 7, further comprising a preheating device, a drying device, a cleaning device;

10. The electrostatic spraying system of claim 7 further comprising at least one first spray booth for pre-spraying the product being sprayed prior to spraying by the electrostatic spraying device and/or at least one second spray booth for post-spraying the product being sprayed after spraying by the electrostatic spraying device.