CN117867620A - Gantry type electrophoretic coating system - Google Patents

Abstract

The invention belongs to the technical field of spray processing, and relates to a gantry type electrophoretic coating system, which comprises a workpiece conveying continuous rail, and a pretreatment device, an electrophoretic coating device and a post-treatment device which are sequentially arranged along the conveying direction of the workpiece conveying continuous rail, wherein an electrophoretic liquid precoating device for precoating an electrophoretic liquid on a workpiece to be coated is arranged between the pretreatment device and the electrophoretic coating device. The invention overcomes the problem of bubble pinholes existing in the prior system by improving the electrophoretic coating system, and is more beneficial to forming smoother coating film.

Description

Gantry type electrophoretic coating system

Technical Field

The invention belongs to the technical field of workpiece coating, and relates to a gantry type electrophoretic coating system.

Background

The invention relates to a method for coating a substrate surface by using an external electric field to directionally transfer and deposit particles such as pigment, resin and the like suspended in an electrophoretic liquid on the substrate surface of one electrode, the principle of the electrophoretic coating is the end of the 30 th century, but the development of the technology and the industrial application are that after 196 years of water, the electrophoretic coating is a special coating film forming method developed in the last 30 years, and the method is a construction process with the most practical significance of the coating, has the characteristics of water solubility, no toxicity, easy automatic control and the like, and is rapidly widely applied to industries such as automobiles, building materials, hardware, household appliances and the like.

The gantry type automatic electrophoretic coating equipment is one of electrophoretic coating equipment, has the characteristic of stable support, is particularly effective for coating of large machinery, is convenient for the operation of staff, and is very safe.

The existing electrophoretic coating system, for example, CN110093653A discloses an automobile body electrophoretic coating production line, including last piece transfer equipment, the exit of going up piece transfer equipment is connected with the entry through the conveyer chain and lifts the machine, the exit of entry lift is connected to the electrophoretic coating channel through the conveyer chain, the electrophoretic coating is in the channel from the entrance to the exit has set gradually coating device, spray set, immersion cleaning device, the exit of electrophoretic coating channel is connected with the exit through the conveyer chain and lifts the machine, the exit of exit lift is connected with down a transfer equipment through the conveyer chain, and operating stability is high, degree of automation is high, the coating is effectual.

Also disclosed as CN116623253A is a full-automatic gantry electrophoretic coating device and an electrophoretic coating method, and relates to the technical field of accessory spraying. The device comprises a hanging plate and a hot bath area, wherein the hot bath area is connected with a degreasing area through a workpiece hanger continuous track, and the degreasing area is connected with a ceramic area through the workpiece hanger continuous track. Through selecting different processes, satisfy the electrophoresis technology requirement of different grade type work piece, utilize intelligent program control system to carry out full-automatic application operation to whole device, add simultaneously and blow the mechanism on the link plate, blow to the application piece for can blow dry the application piece more thoroughly when the waterlogging caused by excessive rainfall, accelerate the waterlogging caused by excessive rainfall rate, improve the efficiency of waterlogging caused by excessive rainfall drying, accelerate work efficiency, replace the high strength operation that carries out the electrophoresis application by the manual work for a long time by full-automatic operation, improve workman's operating condition, improve civilization degree of production greatly, increase market competitiveness for the enterprise, save cost, resource for the user.

However, with these prior art systems, the resulting surface film layer is prone to bubble pinholes.

Disclosure of Invention

The invention aims to provide a gantry type electrophoretic coating system, which is characterized in that an electrophoretic liquid precoating device for a workpiece is additionally arranged after pretreatment and before entering an electrophoretic coating film through improvement of equipment, so that the condition that a bubble pinhole appears on a film layer on the surface of the workpiece can be greatly improved.

The invention adopts the following technical scheme:

the gantry type electrophoretic coating system comprises a workpiece conveying continuous rail, a pretreatment device, an electrophoretic coating device and a post-treatment device which are sequentially arranged along the conveying direction of the workpiece conveying continuous rail, wherein an electrophoretic liquid precoating device for precoating the workpiece to be coated with electrophoretic liquid is arranged between the pretreatment device and the electrophoretic coating device.

When the electrophoretic coating system on the current market is utilized, a coating film formed on the surface of a coated product is coated, and a bubble pinhole appears, so that the quality of the product is affected. The inventor carries out strict test and screening on each process, and supposedly the reason is probably that when the workpiece enters a coating device of the electrophoresis coating channel after pretreatment is finished, poor infiltration of the surface of the workpiece occurs during the infiltration, particularly when a concave surface of a product contacts with electrophoresis liquid, some bubbles are sealed in a paint film, so that bubble pinholes are formed on the surface of the workpiece.

According to the technical scheme, before the workpiece enters the electrophoresis tank, the workpiece is subjected to electrophoretic liquid precoating, so that the surface of the workpiece is in a wet state, and the workpiece enters the electrophoresis tank to be contacted with the electrophoretic liquid, so that the situation of poor infiltration can not occur.

Preferably, the electrophoretic liquid precoating device comprises a precoating bracket arranged at the inlet end of the electrophoretic coating device and a precoating spray head arranged on the precoating bracket, wherein the precoating spray head is communicated with the electrophoretic liquid.

Preferably, the precoating spray heads comprise positive side spray heads positioned on two sides of the workpiece conveyed through the workpiece conveying continuous rail, bottom spray heads positioned at the bottom of the workpiece and upper side spray heads positioned on two sides above the workpiece.

Preferably, the spray direction of the upper side spray head is inclined downward by 30 ° to 60 °.

Preferably, a gas shower head for injecting gas is further provided on one side of the upper shower head. The liquid spraying and the air spraying are combined, and the gas can blow off the electrophoresis liquid on the workpiece, so that the electrophoresis liquid can be rapidly distributed on the surface of the workpiece. The gas may be any gas, preferably air. The spraying direction of the gas spraying head may be the same as that of the upper side spraying head, or may be different, and the inclination angle is preferably 30 ° to 60 ° obliquely downward.

Preferably, the electrophoretic coating device comprises an electrophoresis tank for containing the electrophoresis liquid, and an electrophoresis component arranged in the electrophoresis tank, wherein an electrophoresis liquid collecting tank communicated with the electrophoresis tank is arranged at the front end (workpiece inlet end) of the electrophoresis tank.

Preferably, the precoating spray head is communicated with the electrophoresis tank of the electrophoresis coating device, the electrophoresis liquid in the electrophoresis tank is utilized to precoat the workpiece with the electrophoresis liquid, the structural design is simpler, and additional electrophoresis liquid supply is not needed.

Preferably, the electrophoretic coating system further comprises an auxiliary infiltration device arranged on one side of the electrophoretic coating device, and the auxiliary infiltration device is used for further assisting the infiltration of the workpiece and is matched with the electrophoretic liquid precoating device to realize the complete infiltration of the workpiece.

Preferably, the auxiliary infiltration device comprises a base arranged on one side of the electrophoresis tank, a mechanical arm arranged on the base, and an action part arranged at the front end of the mechanical arm and used for contacting a workpiece and driving the workpiece.

Preferably, the action component is an electromagnet assembly arranged at the front end of the mechanical arm.

By implementing the technical scheme, the invention has the following beneficial effects:

the invention overcomes the problem of bubble pinholes existing in the prior system by improving the electrophoretic coating system, and is more beneficial to forming smoother coating film.

Drawings

FIG. 1 is a schematic top view of a portion of an electrocoating system with an electrophoretic fluid precoating device according to an embodiment of the invention;

FIG. 2 is a schematic top view of a portion of an electrocoating system with a collection tank according to one embodiment of the invention;

FIG. 3 is a schematic diagram showing a structure of an electrophoretic fluid pre-coating apparatus according to another embodiment of the present invention;

FIG. 4 is a schematic top view of a portion of an electrocoating system according to another embodiment of the invention;

fig. 5 is a cross-sectional view of the electrocoating system of fig. 4.

In the figure, 10-workpiece conveying continuous tracks, 20-electrophoretic coating devices, 21-electrophoresis tanks, 22-electrophoresis structures, 30-electrophoresis liquid pre-coating devices, 31-pre-coating supports, 32-pre-coating spray heads, 321-positive side spray heads, 322-bottom spray heads, 323-upper sides Fang Pentou, 33-gas spray heads, 34-collecting tanks, workpieces-40, 50-auxiliary infiltration devices, 51-bases, 52-mechanical arms, 53-acting components and 54-control parts.

Detailed Description

The invention is further described below by means of specific examples. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.

In the description of the embodiments, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the inventive product is conventionally put in use, or the directions or positional relationships in which those skilled in the art conventionally understand are merely for convenience of describing the present invention and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

Example 1

Referring to fig. 1, a gantry type electrocoating system includes a workpiece conveying continuous rail 10, a pretreatment device, an electrocoating device 20, and a post-treatment device, which are sequentially disposed along a conveying direction of the workpiece conveying continuous rail 10. The workpiece 40 is placed at the starting end of the workpiece conveying continuous track 10, and then sequentially passes through the pretreatment device, the electrophoretic coating device 20 and the post-treatment device, and after the workpiece is finished, the workpiece is removed, so that one round of coating is finished.

The pretreatment device comprises a structure for sequentially treating workpieces, and comprises hot water spraying, pre-degreasing, main degreasing, water washing, re-water washing, phosphating, water washing, passivation and pure water washing. The post-treatment device comprises a first UF liquid washing tank, a second UF liquid washing tank, a first pure water washing tank, a second pure water washing tank and a drying channel which are sequentially arranged. The above-described constructions of the pretreatment device and the aftertreatment device are any practicable construction of the prior art, and are not further developed here, and are not shown in the figures.

The electrophoretic coating device 20 comprises an electrophoretic tank 21 and an electrophoretic structure 22 in the electrophoretic tank 21, and the electrophoretic tank 21 is filled with electrophoretic fluid.

In this embodiment, preferably, an electrophoretic liquid pre-coating device 30 for pre-coating the workpiece to be coated with an electrophoretic liquid is provided between the pretreatment device and the electrophoretic coating device 20. Before the workpiece enters the electrophoresis tank 21, the workpiece is subjected to electrophoresis liquid precoating, so that the surface of the workpiece is in a wet state, and the workpiece enters the electrophoresis tank 21 to be contacted with the electrophoresis liquid, so that the situation of poor infiltration can not occur.

In a specific embodiment, the electrophoretic fluid pre-coating device 30 includes a pre-coating support 31 disposed at an inlet end of the electrophoretic coating device 20, and a pre-coating nozzle 32 disposed on the pre-coating support 31, where the pre-coating nozzle 32 is in communication with the electrophoretic fluid. To simplify the structure, the pre-coating head 32 is directly connected to the electrophoretic fluid in the electrophoretic tank 21. The pre-coat spray heads 32 are mounted on the two sides of the workpiece transported by the workpiece transport continuous track. The precoating nozzle 32 can be installed on the precoating bracket 31 in a lifting manner, and can be adjusted in height according to different workpieces, or can be moved up and down for spraying in the spraying process, so that a better spraying effect is realized.

In view of the fact that it is also necessary to collect the electrophoretic fluid flowing down from the preliminary spraying, a collecting tank 34 for collecting the preliminary spraying electrophoretic fluid is provided at the front end of the electrophoretic tank 21, which communicates with the electrophoretic tank 21, and the bottom of the collecting tank 34 is inclined toward the electrophoretic tank 21, see fig. 2.

Example 2

On the basis of example 1, the electrophoretic spray system was further optimized, as follows in detail with reference to fig. 3:

in this embodiment, the pre-coating heads 32 are arranged in multiple directions, and specifically include a front side head 321 located at two sides of the workpiece conveyed by the workpiece conveying continuous track, a bottom head 322 located at the bottom of the workpiece, and an upper side head 323 located at two sides above the workpiece. The spraying direction of the upper side spray head 323 is inclined downward by 30 ° to 60 °, and the present embodiment is preferably adjusted to 45 °.

In this embodiment, it is also preferable that a gas shower head 33 for injecting gas is provided on the position side of the upper shower head 323. The liquid spraying and the air spraying are combined, and the gas can blow off the electrophoresis liquid on the workpiece, so that the electrophoresis liquid can be rapidly distributed on the surface of the workpiece. The gas may be any gas, preferably air. The direction of the gas jet 33 may be the same as or different from the direction of the upper jet 323, but is preferably set to 45 ° in the embodiment, preferably 30 ° to 60 ° obliquely downward.

Example 3

On the basis of example 2, the electrophoretic spray system was further optimized, as follows in detail with reference to fig. 4 and 5:

in this embodiment, a set of auxiliary infiltration devices 50 is further provided to further assist in the infiltration of the workpiece, and is matched with the electrophoretic fluid pre-coating device 30 to achieve complete infiltration of the workpiece.

The auxiliary infiltration device 50 is arranged on one side of the electrophoresis tank 21, preferably near the collection tank 34, and at the inlet of the electrophoresis tank 21, complete infiltration is achieved before a large amount of substances in the electrophoresis liquid are enriched on the workpiece. The auxiliary infiltration device 50 comprises a base 51 fixed on one side of the electrophoresis tank 21, a mechanical arm 52 arranged on the base 51, an action part 53 arranged at the front end of the mechanical arm 52 and used for contacting a workpiece and driving the workpiece, and a control part 54 for controlling the action of the mechanical arm 52. The mechanical arm 52 can drive the action part 53 to swing, and the action part 53 acts on the workpiece to swing the workpiece in the electrophoresis liquid, so that the infiltration effect of the workpiece is rapidly improved.

The acting component 53 may act on the workpiece in a grabbing manner, and the acting component 53 may act on the workpiece in a magnetic attraction manner because the workpiece is mostly metal, and the grabbing manner adopts a mechanical gripper, is integrally structured with the mechanical arm 52, and is controlled by the control member 54 to perform grabbing and loosening actions. The magnetic attraction type adopts an electromagnet assembly arranged at the front end of the mechanical arm 52, and the electromagnet is electrified or powered off to realize the action of the electromagnet on the workpiece.

Claims (9)

1. The gantry type electrophoretic coating system comprises a workpiece conveying continuous rail, and a pretreatment device, an electrophoretic coating device and a post-treatment device which are sequentially arranged along the conveying direction of the workpiece conveying continuous rail, and is characterized in that an electrophoretic liquid precoating device for precoating the workpiece to be coated with electrophoretic liquid is arranged between the pretreatment device and the electrophoretic coating device.

2. The gantry type electrophoretic coating system according to claim 1, wherein the electrophoretic liquid precoating device comprises a precoating bracket arranged at an inlet end of the electrophoretic coating device, and a precoating spray head arranged on the precoating bracket, and the precoating spray head is communicated with the electrophoretic liquid.

3. A gantry type electrocoating system as claimed in claim 2, characterized in that the precoating spray heads include positive side spray heads on both sides of the workpiece conveyed by the workpiece conveying continuous rail, bottom spray heads on the bottom of the workpiece, and upper side spray heads on both sides above the workpiece.

4. A gantry type electrocoating system according to claim 3, characterized in that the spray direction of the upper side spray head is inclined downward by 30 ° to 60 °.

5. A gantry type electrocoating system according to claim 3, characterized in that a gas spray head for spraying gas is further provided at a position side of the upper side spray head.

6. The gantry type electrophoretic coating system according to claim 1, wherein the electrophoretic coating device comprises an electrophoretic tank for containing electrophoretic liquid, and an electrophoretic component arranged in the electrophoretic tank, and an electrophoretic liquid collecting tank communicated with the electrophoretic tank is arranged at the front end of the electrophoretic tank.

7. The gantry type electrocoating system as claimed in claim 6, wherein the precoating spray head is communicated with an electrophoresis tank of the electrocoating device.

8. The gantry type electrocoating system as claimed in claim 6, further comprising an auxiliary infiltration device provided at one side of the electrocoating device.

9. The gantry type electrophoretic coating system according to claim 8, wherein the auxiliary infiltration device comprises a base arranged on one side of the electrophoresis tank, a mechanical arm arranged on the base, and an action component arranged at the front end of the mechanical arm and used for contacting and driving the workpiece.