CN210117431U - Silane pretreatment system for electrophoretic coating - Google Patents

Abstract

The utility model discloses a silane pretreatment system for electrophoretic coating, which comprises a pre-degreasing tank, a positive degreasing tank, a first spray tank, a swimming soaking tank, a second spray tank and a surface cleaning device in sequence; the degreasing agent is arranged in the pre-degreasing tank and the front degreasing tank, the silane spraying mechanism is arranged in the first spraying tank and the second spraying tank, the silane solution capable of completely immersing parts is contained in the bottom of the immersion groove, the second spraying tank is communicated with the immersion groove through a pipeline, and a first overflow pipe communicated with the first spraying tank is arranged at the upper part of the immersion groove. The utility model discloses thereby have can reuse silane reduction in production cost's technological effect.

Description

Silane pretreatment system for electrophoretic coating

Technical Field

The utility model belongs to the technical field of the technique of automobile parts processing and specifically relates to a silane pretreatment systems of electrophoresis application is related to.

Background

Electro-coating (electro-coating) is a coating method in which particles such as pigments and resins suspended in an electrophoretic fluid are directionally transferred by an applied electric field and deposited on the surface of a substrate, which is one of electrodes. The electrophoretic coating is commonly called as plating paint, and the basic principle is that the resin contained in the cathode electrophoretic coating has basic groups, and the resin is neutralized by acid to form salt and is dissolved in water. After direct current is supplied, acid radical negative ions move to the anode, resin ions and pigment particles coated by the resin ions carry positive charges to move to the cathode and are deposited on the cathode, and then the paint plating on the substrate is realized. The electrophoretic coating is a special coating forming method developed in the last 30 years, is a construction process which has the most practical significance for water-based paint, has the characteristics of water solubility, no toxicity, easiness in automatic control and the like, and is rapidly and widely applied to industries such as automobiles, building materials, hardware, household appliances and the like. In the automobile industry, in order to enable automobile parts to meet the installation and use requirements, prolong the service life of the parts and enhance the attractiveness of automobiles, electrophoretic coating is often used for coating the automobile parts.

Before electrophoretic coating, in order to avoid electrochemical reaction between metal parts and electrophoresis, passivation pretreatment is usually performed on the metal parts. Among the conventional metal surface pretreatment processes, the most widely used are phosphate conversion coating (phosphating) technology and chromate passivation technology. However, with the increasing prominence of environmental issues, new surface pretreatment technologies which are environmentally friendly have been sought and developed, and silane pretreatment is an environmentally friendly, practical and effective surface treatment technology, and is considered as the most promising new technology. However, since silane is expensive, and a large amount of silane is required to be used for each step of the pretreatment step many times, it is necessary to recycle silane to reduce the production cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a thereby can reuse silane reduction in production cost's silane pretreatment systems of electrophoresis application.

The utility model discloses a can realize through following technical scheme:

a silane pretreatment system for electrophoretic coating sequentially comprises a pre-degreasing tank, a positive degreasing tank, a first spraying tank, a soaking tank, a second spraying tank and a surface cleaning device; the degreasing agent is arranged in the pre-degreasing tank and the front degreasing tank, the silane spraying mechanism is arranged in the first spraying tank and the second spraying tank, the silane solution capable of completely immersing parts is contained in the bottom of the immersion groove, the second spraying tank is communicated with the immersion groove through a pipeline, and a first overflow pipe communicated with the first spraying tank is arranged at the upper part of the immersion groove.

By adopting the technical scheme, the parts needing to be painted sequentially enter the pre-degreasing tank and the positive degreasing tank, and the degreasing agent is used for removing grease and mineral oil on the metal surface, so that the adverse effect of impurity dirt on the later electrophoresis process is reduced or even avoided. The degreased parts enter a first spray tank, a leaching tank and a second spray tank in sequence to be subjected to silane passivation treatment, and silane solution is uniformly sprayed on the surfaces of the parts in the first spray tank to perform preliminary passivation; then the parts enter the immersion tank to be completely immersed by the silane solution, the silane solution in the immersion tank can permeate into holes and gaps which are difficult to be uniformly sprayed in the parts for passivation, the passivation effect is further improved, and then the parts enter the second spraying tank to be sprayed with the silane solution again, so that the passivation effect is enhanced. The parts after silane passivation treatment enter the surface cleaning device again to elute the silane on the surface, so that the surfaces of the parts enter the subsequent electrophoresis process more cleanly, and the electrophoresis effect is improved.

Because automobile parts are provided with holes and cavities, the holes and the cavities can enable the parts to carry a part of silane when entering the second spraying groove from the immersion chamber, so that the volume of the silane at the bottom of the second spraying groove is increased, the bottom of the second spraying groove is communicated with the immersion groove through a pipeline, the silane collected at the bottom of the second spraying groove can be returned to the immersion groove, the silane in the immersion groove is always kept in a proper volume, the parts are fully immersed, the silane supplement amount of an external silane containing container to the immersion groove is reduced, and the silane is saved so as to reduce the production cost.

Further setting the following steps: the lower part of the second spraying groove is connected with a silane collecting box through a pipeline, the bottom of the silane collecting box is provided with a return pipe communicated with the immersion groove, and the second spraying groove is communicated with the immersion groove through the silane collecting box and the return pipe.

Through adopting above-mentioned technical scheme, the silane solution that the second sprays the tank bottom and collect passes through the pipeline and gets into the silane collection box, because the density of silane in the silane solution is greater than the density of water, consequently, the layering phenomenon can appear in the silane collection box in the silane solution, the great silane of density is stayed the bottom and is flowed back to dipping swimming groove through the back flow in, thereby not only can realize the automatic retrieval and utilization of silane solution, can also compensate and dip swimming groove because the silane concentration that the passivation reaction arouses reduces the problem, make the silane that soaks in the swimming groove remain at suitable concentration all the time, improve passivation efficiency and improve passivation effect.

Further setting the following steps: soak the pond and be close to bottom lateral wall department and be equipped with pumping pipe and first circulating pump, the both ends of pumping pipe are connected respectively soak the relative both sides of pond bottom lateral wall, first circulating pump is installed pumping pipe is last.

By adopting the technical scheme, because the density of the silane in the silane solution is greater than that of water, if the silane solution is stood in the immersion tank for a long time, the layering phenomenon is easy to occur, and the problem of uneven passivation effect is caused. Therefore, the pumping pipe and the first circulating pump are arranged at the position, close to the side wall of the bottom, of the immersion groove, silane solution in the immersion groove flows circularly through the first circulating pump and the pumping pipe, so that the silane solution is kept at uniform concentration all the time, and the surface of a part is passivated more efficiently.

Further setting the following steps: silane sprays mechanism includes feed liquor pipe, spray cylinder and drain pipe, spray cylinder is open-top's cylinder tube-shape and the inside inner chamber that is equipped with of lateral wall, evenly seted up on spray cylinder's the inside wall with the hydrojet hole of inner chamber intercommunication, feed liquor pipe one end is connected with outside silane splendid attire container, the other end with spray cylinder's inner chamber intercommunication, the drain pipe is located the bottom position of first spray tank or second spray tank and is equipped with out the liquid valve door.

Through adopting above-mentioned technical scheme, silane solution is carried to the inner chamber in the spray cylinder lateral wall through the feed liquor pipe to outside silane splendid attire container, and silane solution in the inner chamber is spout from a plurality of evenly distributed's the hole department that sprays on the spray cylinder inside wall to the spare part of shelving in the spray cylinder carries out the omnidirectional spraying, and the silane spraying on spare part surface is more comprehensive and even, improves spraying effect when improving spraying efficiency.

Further setting the following steps: the bottom of the first spraying groove is connected with a second circulating pipe communicated with the liquid inlet pipe, and the second circulating pipe pumps silane at the bottom of the first spraying groove into the liquid inlet pipe through a second circulating pump.

Through adopting above-mentioned technical scheme, the silane solution that first spraying tank bottom was collected can be carried to the feed liquor pipe in through the second circulating pipe, makes the silane solution in the first spraying tank except can supplementing by the feed liquor pipe, also can realize recycling through the second circulating pipe, reduces required silane use amount in the first spraying tank, reduction in production cost.

Further setting the following steps: the degreasing device is characterized in that a plurality of first spray pipes communicated with an external degreasing agent container are arranged in the pre-degreasing tank, the first spray pipes are uniformly distributed on the inner side of the side wall of the pre-degreasing tank, and a plurality of first high-pressure spray heads are mounted on the first spray pipes.

By adopting the technical scheme, the degreasing agent is conveyed to the first spray pipe by the external degreasing agent container, then the degreasing agent is sprayed out to the surface of the part by the high-pressure spray heads on the first spray pipe, and the degreasing agent sprayed out by the high-pressure spray heads has higher impact force, so that the descaling can be performed by the physical action of strong impact besides the chemical action of the surfactant of the degreasing agent, and the descaling is more thorough and rapid.

Further setting the following steps: the degreasing agent capable of completely immersing parts is contained at the bottom of the front degreasing tank, and a second overflow pipe connected with the pre-degreasing tank is arranged at the upper part of the front degreasing tank.

By adopting the technical scheme, the degreasing agent is sprayed in the pre-degreasing groove of the part, and then the part completely enters the degreasing agent in the front degreasing groove, because the degreasing agent in the front degreasing groove can permeate into holes and gaps which are difficult to be uniformly sprayed in the part for degreasing and descaling, the degreasing and descaling are more thorough.

Further setting the following steps: the surface cleaning device comprises a first rinsing bath and a second rinsing bath, wherein a plurality of second spraying pipes communicated with an external pure water container are arranged in the first rinsing bath, the second spraying pipes are uniformly distributed on the inner side of the side wall in the first rinsing bath, and a plurality of second high-pressure spray heads are arranged on the second spraying pipes.

By adopting the technical scheme, the silane passivated parts successively enter the first rinsing bath and the second rinsing bath to clean the residual silane on the surfaces of the parts, the second spraying pipes spray pure water to the surfaces of the parts through the high-pressure nozzles, the strength of the parts flushed by the pure water is higher, and the residual removing effect is better.

Further setting the following steps: pure water capable of completely immersing parts is contained at the bottom of the second rinsing tank, and a third overflow pipe connected with the first rinsing tank is arranged at the upper part of the second rinsing tank.

By adopting the technical scheme, the parts washed by the high-pressure pure water enter the second rinsing bath and are completely immersed by the pure water, the pure water in the second rinsing bath can further dilute the silane remained on the surfaces of the parts, and the adverse effect of the silane on the subsequent electrophoresis of the parts is further reduced.

To sum up, the utility model discloses a beneficial technological effect does:

(1) the metal parts are pretreated in three stages of degreasing, silane passivation and pure water washing in sequence, so that the surfaces of the parts can be passivated and cleaned well, the effect of a subsequent electrophoresis process is improved, the bottom of the second spraying tank is communicated with the immersion tank through a pipeline, silane collected at the bottom of the second spraying tank can be returned to the immersion tank, the silane in the immersion tank is kept in a proper volume all the time, the parts are fully immersed, the silane supplement amount of an external silane containing container to the immersion tank is reduced, the silane is saved, and the production cost is reduced;

(2) the part, close to the side wall of the bottom, of the immersion groove is provided with a pumping pipe and a first circulating pump, silane solution in the immersion groove circularly flows through the first circulating pump and the pumping pipe, and deposition and layering of the silane solution in the immersion groove are avoided, so that the silane solution is always kept at uniform concentration, and the surface of a part is passivated more efficiently;

(3) the first spraying pipes are arranged in the pre-grease groove, the first high-pressure spraying nozzles are installed on the spraying pipes, and the degreasing agent is sprayed on the surface of the part through the first high-pressure spraying nozzles and has higher impact force, so that the descaling can be performed through the chemical action of the surfactant of the degreasing agent, the descaling can be performed through the physical action of strong impact, and the descaling is more thorough and rapid.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of the pre-degreasing bath 1 in FIG. 1;

fig. 3 is a schematic structural view of the first spray tank 3 in fig. 1.

Reference numerals: 1. a pre-degreasing tank; 2. a positive degreasing tank; 3. a first spray tank; 4. a swimming soaking tank; 5. a second spray tank; 6. a surface cleaning device; 7. a silane spraying mechanism; 8. a first overflow pipe; 9. a silane collection box; 10. a return pipe; 11. pumping out the tube; 12. a first circulation pump; 13. a liquid inlet pipe; 14. a spray cylinder; 15. a liquid outlet pipe; 16. an inner cavity; 17. a liquid outlet valve; 18. a second circulation pipe; 19. a second circulation pump; 20. a first shower pipe; 21. a first high pressure showerhead; 22. a second overflow tube; 23. a first rinsing bath; 24. a second rinsing bath; 25. a second shower pipe; 26. a second high pressure showerhead; 27. a third overflow pipe; 28. a stop valve; 29. a suction pump; 30. a first circulation pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a silane pretreatment system of electrophoresis application includes degreasing tank 1 in advance, just degreasing tank 2, first spray tank 3, soaks the groove 4, second spray tank 5 and surface cleaning device 6 in proper order. The metal parts are subjected to surface degreasing and degreasing treatment in the pre-degreasing tank 1 and the positive degreasing tank 2, the silane spraying mechanism 7 is arranged in the first spraying tank 3 and the second spraying tank 5, and the silane solution capable of completely immersing the parts is contained at the bottom in the immersion tank 4. The parts automatically move through an external tower crane or a movable mechanical claw and sequentially pass through the pre-degreasing tank 1, the positive degreasing tank 2, the first spraying tank 3, the immersion tank 4, the second spraying tank 5 and the surface cleaning device 6, so that the pretreatment of three stages of degreasing, silane passivation and pure water washing is realized, the surfaces of the parts can be well passivated and cleaned, and the effect of a subsequent electrophoresis process is improved.

Referring to fig. 2, a plurality of first spraying pipes 20 are fixedly installed in the pre-degreasing tank 1, and each first spraying pipe 20 is communicated with an external degreasing agent container. The first spray pipes 20 are uniformly distributed on the inner side of the side wall of the pre-degreasing tank 1, and a plurality of first high-pressure spray heads 21 are uniformly arranged on each first spray pipe 20. The bottom of the pre-degreasing tank 1 is connected with a first circulating pipe 30 communicated with the plurality of first spraying pipes 20, and the first circulating pipe 30 returns the degreasing agent at the bottom of the pre-degreasing tank 1 to the first spraying pipes 20 through a pressure pump, so that the recycling of the degreasing agent is realized. The bottom of the positive degreasing tank 2 is filled with degreasing agents capable of completely immersing parts, and a second overflow pipe 22 connected with the pre-degreasing tank 1 is connected to the position, close to the top, of the positive degreasing tank 2.

The metal parts are subjected to surface degreasing and degreasing treatment in a pre-degreasing tank 1 through a high-pressure degreasing agent sprayed by a plurality of high-pressure spray heads, then the parts enter a positive degreasing tank 2 and are completely immersed in the degreasing agent, so that the degreasing agent permeates into holes and gaps which are difficult to be uniformly sprayed in the parts to perform degreasing and descaling, the degreasing and degreasing effects are enhanced, and the subsequent silane spraying on the surfaces of the parts is facilitated to perform more comprehensive passivation.

Referring to fig. 1 and 3, the silane spraying mechanism 7 comprises a liquid inlet pipe 13, a spraying cylinder 14 and a liquid outlet pipe 15, the spraying cylinder 14 is in a cylindrical shape with an open top, an inner cavity 16 is arranged inside the side wall of the spraying cylinder 14, liquid spraying holes communicated with the inner cavity 16 are uniformly formed in the inner side wall of the spraying cylinder 14, and each liquid spraying hole is provided with a rotary nozzle. One end of the liquid inlet pipe 13 is connected with an external silane container, the other end is communicated with an inner cavity 16 of the spray cylinder 14, and the liquid outlet pipe 15 is positioned at the bottom of the first spray groove 3 or the second spray groove 5 and is provided with a liquid outlet valve 17. The silane solution in the inner cavity 16 is sprayed out from a plurality of uniformly distributed spraying holes on the inner side wall of the spraying cylinder 14, so that the parts placed in the spraying cylinder 14 are sprayed in all directions.

The lower part of the second spraying groove 5 is connected with a silane collecting box 9 through a pipeline, the bottom of the silane collecting box 9 is connected with a return pipe 10 communicated with the immersion groove 4, the return pipe 10 is provided with a suction pump 29 and a stop valve 28, the second spraying groove 5 is communicated with the immersion groove 4 through the silane collecting box 9, the return pipe 10 and the suction pump 29, and the position of the immersion groove 4 close to the top is connected with a first overflow pipe 8 communicated with the first spraying groove 3. The parts which are sprayed from the first spraying groove 3 enter the immersion groove 4 to be immersed in the silane solution, and then enter the second spraying groove 5 to be sprayed for the second time, so that thorough passivation treatment is realized. When the silane collected at the bottom of the second spraying tank 5 reaches a certain level, the suction pump 29 and the stop valve 28 are opened, and the suction pump 29 returns the silane solution at the bottom of the second spraying tank 5 to the immersion tank 4 through the return pipe 10, so that the silane in the immersion tank 4 is always kept at a proper volume to fully immerse the parts. When the silane solution level in the immersion tank 4 exceeds the first overflow pipe 8, the silane solution in the immersion tank 4 can enter the first spray tank 3 through the first overflow pipe 8 to perform a spray circulation in the first spray tank 3. The process recycles the silane solution in a first grade, reduces the use amount of silane and reduces the production cost.

Because the density of silane in the silane solution is higher than the density of water, in order to avoid the silane solution from depositing and layering in the excursion tank 4, a pumping pipe 11 is connected to the portion, close to the bottom side wall, of the excursion tank 4, two ends of the pumping pipe 11 are respectively connected to two opposite sides of the bottom side wall of the excursion tank 4, and a first circulating pump 12 is installed on the pumping pipe 11. The silane solution in the immersion tank 4 circularly flows through the first circulating pump 12 and the pumping pipe 11, so that the silane solution is always kept at a uniform concentration, and the surface of the part is passivated more efficiently.

Referring to fig. 1, the surface cleaning device 6 includes a first rinsing bath 23 and a second rinsing bath 24, a plurality of second spraying pipes 25 communicated with an external pure water container are fixedly installed in the first rinsing bath 23, the plurality of second spraying pipes 25 are uniformly distributed on the inner side of the side wall of the first rinsing bath 23, and a plurality of second high-pressure nozzles 26 are installed on the second spraying pipes 25. Pure water capable of completely immersing parts is contained in the bottom of the second rinsing bath 24, and a third overflow pipe 27 connected to the first rinsing bath 23 is provided on the upper portion of the second rinsing bath 24. The parts passivated by silane enter the first rinsing tank 23 and the second rinsing tank 24 in sequence to clean the residual silane on the surfaces of the parts, so that the adverse effect of the residual silane on the subsequent electrophoresis process is reduced.

The implementation principle and the beneficial effects of the embodiment are as follows: when the metal parts are subjected to silane pretreatment, the metal parts are sequentially subjected to degreasing and degreasing through the pre-degreasing tank 1 and the positive degreasing tank 2, then enter the first spraying tank 3, the immersion tank 4 and the second spraying tank 5 to realize silane surface passivation, and finally enter the first rinsing tank 23 and the second rinsing tank 24 to clean silane residues. In the process, the silane solution can flow back to the immersion tank 4 from the second spraying tank 5 and then overflows to the first spraying tank 3 from the immersion tank 4, so that the multi-stage recycling of the silane solution is realized, the use amount of silane is reduced, and the production cost is reduced.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (9)

1. An electrophoresis application silane pretreatment system is characterized in that: the degreasing device sequentially comprises a pre-degreasing tank (1), a positive degreasing tank (2), a first spraying tank (3), a leaching tank (4), a second spraying tank (5) and a surface cleaning device (6); the degreasing agent is arranged in the pre-degreasing tank (1) and the front degreasing tank (2), the silane spraying mechanism (7) is arranged in the first spraying tank (3) and the second spraying tank (5), the silane solution capable of completely submerging parts is contained in the bottom of the immersion groove (4), the bottom of the second spraying tank (5) is communicated with the immersion groove (4) through a pipeline, and a first overflow pipe (8) communicated with the first spraying tank (3) is arranged on the upper portion of the immersion groove (4).

2. The electrocoated silane pretreatment system of claim 1, wherein: the silane collecting box (9) is connected to the lower portion of the second spraying groove (5) through a pipeline, a return pipe (10) communicated with the immersion groove (4) is arranged at the bottom of the silane collecting box (9), and the second spraying groove (5) is communicated with the immersion groove (4) through the silane collecting box (9) and the return pipe (10).

3. The electrocoated silane pretreatment system of claim 2, wherein: soaking trip groove (4) are close to bottom lateral wall department and are equipped with pumping pipe (11) and first circulating pump (12), the both ends of pumping pipe (11) are connected respectively soak the relative both sides of trip groove (4) bottom lateral wall, first circulating pump (12) are installed pumping pipe (11) are last.

4. The electrocoated silane pretreatment system of claim 1, wherein: silane sprays mechanism (7) including feed liquor pipe (13), a spray cylinder (14) and drain pipe (15), spray cylinder (14) and be open-top's cylinder tube-shape and lateral wall inside be equipped with inner chamber (16), evenly seted up on the inside wall of a spray cylinder (14) with the hydrojet hole of inner chamber (16) intercommunication, feed liquor pipe (13) one end is connected with outside silane splendid attire container, the other end with inner chamber (16) intercommunication of a spray cylinder (14), drain pipe (15) are located the bottom position that first spray groove (3) or second sprayed groove (5) and are equipped with out liquid valve (17).

5. The electrocoated silane pretreatment system of claim 4, wherein: the bottom of the first spraying groove (3) is connected with a second circulating pipe (18) communicated with the liquid inlet pipe (13), and the second circulating pipe (18) pumps silane at the bottom of the first spraying groove (3) into the liquid inlet pipe (13) through a second circulating pump (19).

6. The electrocoated silane pretreatment system of claim 1, wherein: be equipped with a plurality of first shower (20) that communicate with outside degreaser splendid attire container in the groove of degreasing in advance (1), a plurality of first shower (20) evenly distributed are in the lateral wall inboard of groove of degreasing in advance (1), install a plurality of first high pressure nozzle (21) on first shower (20).

7. The electrocoated silane pretreatment system of claim 6, wherein: the degreasing agent capable of completely immersing parts is contained at the bottom of the front degreasing tank (2), and a second overflow pipe (22) connected with the pre-degreasing tank (1) is arranged at the upper part of the front degreasing tank (2).

8. The electrocoated silane pretreatment system of claim 1, wherein: surface cleaning device (6) include first wash bowl (23) and second wash bowl (24), be equipped with in first wash bowl (23) a plurality of with outside second shower (25) of pure water splendid attire container intercommunication, a plurality of second shower (25) evenly distributed are in the lateral wall of first wash bowl (23) is inboard, install a plurality of second high pressure nozzle (26) on second shower (25).

9. The electrocoated silane pretreatment system of claim 8, wherein: pure water capable of completely immersing parts is contained at the bottom of the second rinsing tank (24), and a third overflow pipe (27) connected with the first rinsing tank (23) is arranged at the upper part of the second rinsing tank (24).

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