Production line and process of steel road barrier with epoxy zinc-based polyester composite coating

[0034] Example 1, such as figure 1 As shown, an epoxy zinc-based polyester composite coating road steel guardrail production line includes a corrugated board production equipment and a column production equipment.

[0035] The corrugated plate production equipment mainly includes the corrugated plate cold-formed module, the corrugated plate shot blasting processing module, the corrugated plate chemical processing module, the corrugated plate automatic loading module, the corrugated plate double-layer spraying module, the corrugated plate automatic loading and packaging module, each Automatic connection between modules without manual work.

[0036] Such as figure 2 As shown, the corrugated plate is difficult to shot blasting due to its complex shape. The corrugated plate shot blasting processing module adopts a specific blasting head arrangement. There are two groups of blasting heads, one set for the upper and lower blasting heads. Perform shot blasting on the front of the corrugated board. The lower set of blasting heads is used to blast the back of the corrugated board. The upper set of blasting heads has two. The two blasting heads are arranged back and forth along the conveying direction of the corrugated board. , The angle between the two polishing heads in the upper group is 78°, and there are also two polishing heads in the lower group. The two polishing heads are arranged back and forth along the conveying direction of the corrugated board. The angle between is 68°.

[0037] Such as image 3 As shown, the wave plate double-layer spraying module includes a spray gun system. The spray gun system is used to realize the fixed spraying of the workpiece. The accumulation chain is used to accurately position the workpiece based on the spray gun. The spray gun adopts a friction spray gun. The spray gun has two groups. The first group is used to spray the front of the workpiece, and the second group is used to spray the back of the workpiece. The first group has 4 spray guns, 4 spray guns are distributed into 2 layers, and the middle 2 spray guns are set on the upper layer and aligned respectively The center lines on both sides of the corrugated board are perpendicular to the surface and are 25 cm away from the board; 2 spray guns on the outer side are placed on the lower layer, respectively aligned with the center lines on the outer sides of the corrugated board, and perpendicular to the surface, 25 cm away from the board; The distance between the two spray guns is 30cm. The second group of spray guns is equipped with 5 spray guns, 5 spray guns are distributed into 3 layers, the middle spray gun is set on the upper layer, aligned with the center line of the middle peak of the corrugated plate, and perpendicular to the surface; the 2 spray guns next to the middle are set at In the middle layer, align the center line of the two sides of the corrugated board and be perpendicular to the surface; set the outermost two spray guns on the bottom layer, align the center lines of the two outer edges of the corrugated board, and be perpendicular to the surface; two adjacent layers of spray guns The distance between them is 30cm, and the total thickness of the corrugated plate coating after spraying is not more than 40um.

[0038] Column production equipment includes column forming and welding module, column chemical processing module, column automatic loading module, column double-layer spraying module, column automatic loading and packaging module, and the modules are automatically connected without manual labor. The column forming and welding module is used to realize the forming of the column and the shot blasting and rust removal before welding.

[0039] The rest of the structures in the production line in this embodiment can all be implemented with equipment in the prior art, and will not be repeated in this embodiment.

[0040] Embodiment 2 is the production process of the epoxy zinc-based polyester composite coating road steel guardrail. The production process includes the preparation process of the corrugated board and the preparation process of the column.

[0041] The preparation process of the corrugated board includes: strip steel feeding → cold bending forming → shot blasting treatment → dust removal → automatic loading → chemical pretreatment → drying → spraying primer → curing → spraying flour → curing → automatic loading → Automatic inspection → automatic packaging.

[0042] The preparation process of the column includes: strip steel feeding → shot blasting → dust removal → forming welding → automatic loading → chemical pretreatment → spraying base powder → curing → spraying flour → curing → automatic loading → automatic inspection → automatic packaging.

[0043] In the preparation process of the column, the process of forming and welding steps is anti-rust. In this embodiment, the environmentally friendly basic anti-rust is adopted, the alkali concentration is controlled at 0.5% to 1%, the temperature is at 40 to 80°C, and the inner and outer walls of the column have appropriate moisture Control it within 3 minutes after leaving the welding process. Columns that have been rust-proofed will not return to rust within 48 hours.

[0044] In the preparation process of the corrugated board and the preparation process of the column, the chemical pretreatment adopts silanization treatment. The specific treatment process of this process is: degreasing → first softening water washing → second softening water washing → silane treatment → third time Softening water washing → the fourth softening water washing → scalding.

[0045] Among them, the degreasing can be a commercially available product using a silane-specific degreasing agent. The degreasing method is spray treatment, the temperature is 50~70℃, and the spray is 1 minute.

[0046] There are four times of softening water washing. The second softening water wash is overflow washing to supplement the first softening water wash; the fourth softening water washing is overflow water washing, which is used for the third softening water wash to save water. The second and fourth softening water requires conductivity not to exceed 100ms. The washing method is spray washing, and the washing time is 1 minute.

[0047] The silane treatment adopts zirconium silane treatment agent, which is a commercially available product. The treatment method is spray type, pH=3.5~4.5, and spray at 20~40℃ for 1 minute.

[0048] The scalding uses softened water, the scalding method is spraying, the conductivity of the scalding water does not exceed 100ms, the temperature is 50~70℃, and the spray is 1 minute.

[0049] After silanization, the conversion film is blue or brown.

[0050] In the step of spraying the foundation powder of the corrugated board and the step of spraying the foundation of the column, the foundation powder adopts epoxy zinc-based powder. The effective ingredients and the ratio of the epoxy zinc-based powder are: E12 epoxy resin 13%, 904 solid epoxy resin Resin 24%, phenolic resin 10%, 907 curing agent 24%, V205 crosslinking agent 15%, benzoin 0.4%, imidazole 1.5%, defoaming agent 1%, pigment 3%, wollastonite 8.1%; among them, curing agent The curing agent 907 is a commercially available product, and the cross-linking agent V205 is a commercially available product.

[0051] The preparation process of the epoxy zinc-based powder is: mixing the active ingredients in the above proportions for 3 to 5 minutes, then melt extruding, crushing, and grinding at 115°C, and then mixing with scaly zinc powder at 80-83°C. For bonding, the bonding ratio is 3:2, and the final zinc content in the powder is about 40%.

[0052] The base powder and flour of the workpiece are sprayed by spraying modules, and the curing temperature of the coating is only 200 ℃.

[0053] The automatic loading and unloading steps of the workpiece include four modules: automatic loading of corrugated plates, automatic loading of corrugated plates, automatic loading of columns, and automatic loading of columns.

[0054] Automatic loading of the corrugated board, the corrugated board is transferred to the loading process by the roller conveyor, the electromagnet is pulled to the vertical board station, the corrugated board is erected, the hanger is positioned and the hanger is hung on the craft hole by the manipulator to complete the wave board Automatic loading;

[0055] The automatic loading of the corrugated board reverses the above process.

[0056] Automatic loading of the column. The column is conveyed by the conveyor roller to the hole-finding process. After the hole position is fixed, it is picked up by the manipulator to the hexagonal turntable and stands upright. The turntable rotates to make the column reach directly below the hanger, and the manipulator completes the hole-finding pendant action; The automatic loading of the column is based on the automatic loading plan of the corrugated board. Automatic loading and unloading greatly reduces the labor intensity of workers and saves labor at the same time.

[0057] The equipment used in this embodiment is the same as the production line in Embodiment 1, and will not be repeated in this embodiment.

[0058] The production line and production process of the present invention are adopted to prepare highway steel guardrail. The highway steel guardrail includes a corrugated plate and a column. The corrugated plate includes a corrugated plate body. The corrugated plate body is provided with an epoxy zinc-based coating and a polyester coating. It is an epoxy zinc-based coating with a thickness of 36~56um, and the surface layer is a polyester coating with a thickness of 70~90um. The column includes a column body. The column body is equipped with epoxy zinc-based coating and polyester coating. The bottom layer is epoxy zinc-based coating with a thickness of 46~66um. The surface layer is polyester coating with a thickness of 60~80um. , The inner wall and outer wall of the column have the same coating structure.