Production process of anti-corrosion protection plate of road and bridge concrete guardrail

Abstract

The invention relates to the technical field of plate preparation, in particular to a production process of an anti-corrosion protection plate of a road and bridge concrete guardrail, which comprises the following steps: firstly, preparing liquid resin into strip resin, and then adding a fiber material on one surface of the strip resin to prepare composite resin; then the composite resin and at least one piece of strip-shaped resin or the composite resin are overlapped to form multi-layer resin, and finally, the multi-layer resin is subjected to die-casting forming in a die-casting die to prepare the required anti-corrosion protection plate product. Compared with a traditional process of firstly doping fibers and then carrying out die casting, the protective plate production process disclosed by the invention has the advantages that the production efficiency is higher, meanwhile, materials can be saved, waste is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plate preparation, and in particular to a production process of an anti-corrosion guard plate for a road and bridge concrete guardrail. Background Art

[0002] During the construction of highways, especially expressways and elevated highways, concrete guardrails need to be installed on both sides of the road to ensure driving safety. Due to the characteristics of concrete, after a long period of environmental erosion, the structural strength and appearance of concrete guardrails will be significantly reduced. Highway guardrails in coastal areas will corrode faster. In addition, the snow removal agent used for snow removal in winter will also cause erosion to the concrete guardrails. Due to the anti-corrosion ability of resin materials, the road and bridge infrastructure party proposed to set up an anti-corrosion guardrail for the guardrail to delay corrosion and improve the appearance.

[0003] At present, the production process of cable trench covers, road manhole covers or rain grates produced by our factory is: first, the resin material is hot-melted, then mixed with fiber materials such as glass fiber, and finally the resin material is injected into the mold for die-casting. If the above process is still used to make anti-corrosion guard plates, not only the production cost is high, but the production efficiency is also low, which cannot meet the needs of customers. Specifically, it is reflected in: 1. It is impossible to mix and add fiber materials of special shapes to meet different structural requirements. 2. Cable trench covers, manhole covers, etc. have a certain thickness and a relatively simple shape, which is convenient for die-casting; while the shape of the guard plate is more complicated than that of the cover plate and the thickness is less than that of the cover plate. It is more difficult to inject the mixed fiber resin into the mold, resulting in low production efficiency.

[0004] Therefore, in order to meet the needs of practical applications, it is urgent to develop and design a new production process suitable for the production of anti-corrosion guard plates. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-efficiency, low-cost production process suitable for producing thin guard plates.

[0006] The technical solution to the technical problem to be solved by the present invention is: a production process for an anti-corrosion guard plate for a road and bridge concrete guardrail, characterized by comprising the following steps:

[0007] Step 1, forming a liquid resin material into a strip-shaped resin;

[0008] Step 2, adding fiber material to one surface of the strip resin to form a composite resin;

[0009] Step 3, stacking the composite resin and at least one strip of resin or composite resin into multiple layers of resin;

[0010] Step 4: Place the multi-layer resin into a mold and perform hot pressing to form an anti-corrosion protective plate, wherein the temperature during hot pressing is 180° C., the pressure is 20 MPa, and the time is 350 seconds.

[0011] Preferably, in step 1, a molding device is used to prepare the strip-shaped resin, and the molding device includes a material box and a conveying platform arranged at the bottom of the material box, and a notch is arranged at the bottom of one side of the material box for molding the strip-shaped resin.

[0012] More preferably, a film support is provided on one side of the material box, a rolled film is mounted on the upper portion of the film support, and the film is laid on the upper portion of the conveying platform and moves with the strip-shaped resin.

[0013] More preferably, in step 2, the fiber material is continuous fiber or mesh fiber.

[0014] More preferably, in step 2, the fiber material is short fibers, the length of the short fibers is 3-60 mm, and the short fibers are formed by crushing packaged continuous fibers or mesh fibers.

[0015] More preferably, in the step 2, short fibers are evenly sprinkled on the upper part of the strip-shaped resin and then resin particles are evenly sprinkled.

[0016] More preferably, the resin particles are spherical particles, and the diameter of the spherical particles is 1-3 mm.

[0017] More preferably, the resin particles are strip-shaped particles, and the diameter of the strip-shaped particles is 1 mm and the length is 3-6 mm.

[0018] More preferably, in step 3, the composite resin and the strip-shaped resin or the composite resin are pressed into multi-layer resins by a rolling roller.

[0019] Preferably, two rolling rollers are provided, and a spiral surface is provided on the upper portion of the rolling roller, and the spiral surfaces on the upper portions of the two rolling rollers are arranged alternately.

[0020] Beneficial effects of the present invention:

[0021] This production process first flakes the resin, then forms it into strips during large-scale production, then mixes the fiber material and keeps it in strips, and then puts the strip-shaped multi-layer resin into the mold for die casting. Compared with the traditional process of first mixing and then hot film die casting:

[0022] 1. Higher production efficiency. The efficiency of flowing into the mold after doping with fibers in the traditional process is very low, and the efficiency of manual spreading in the mold is also relatively low, and it requires more labor costs. However, directly placing the fiber-doped sheet material into the mold is efficient and evenly distributed.

[0023] 2. Save materials. First of all, the main application is anti-corrosion performance, and the strength requirement is low. The use of mixed fiber materials in this process can save fiber materials. Secondly, thermosetting resin is used, and the strip resin is cut into sheets that match the mold after cutting to a suitable size. The cut scraps can be reused through cutting and splicing, which can reduce waste and reduce costs.

[0024] The application of this production process is not only suitable for the production of anti-corrosion protective plates, but also can be used to make covers or manhole covers that meet other special requirements by adjusting parameters and adjusting the distribution of mixed fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a process flow chart of an embodiment of the present invention.

[0026] Figure 2 It is a local assembly line equipment suitable for the production process of the present invention.

[0027] Figure 3 It is a schematic diagram of a material box of the present invention.

[0028] In the figure: 100, material box; 110, fixing plate; 120, material discharging plate; 130, side baffle; 200, conveying platform; 140, film support; 310, fiber material support; 320, crushing device; 400, rolling roller; DETAILED DESCRIPTION

[0029] In order to make the technical solution and beneficial effects of the present invention clearer, the implementation methods of the present invention are further explained in detail below.

[0030] Step 1: liquefy the resin material to make a strip of resin. In this step, the resin is only made into a sheet without adding fiber materials such as glass fiber. After the strip of resin is made, the second step is performed to allow the strip of resin to adhere to the glass fiber.

[0031] First, the sheet can be processed through a mold. Put the liquid resin into a plate-shaped mold. The mold can be a rectangular groove. The liquid can be naturally spread or quickly flattened into a sheet by covering it with a flat plate. Then sprinkle short glass fibers or long filamentary fibers or mesh fibers on the top.

[0032] Secondly, it can be extruded into a sheet through an extrusion die and a preparation process. When the sheet is made, it can be kept in a long sheet or strip and made into a roll. After extrusion, the strip resin is kept horizontal, and then short fibers are scattered or filaments or mesh fibers are pressed into the upper part of the strip resin by a roller.

[0033] Alternatively, a molding device is used to prepare the tape-shaped resin.

[0034] The molding equipment includes a material box 100 for containing liquid resin. The upper part of the material box 100 is open for filling liquid resin. The lower part of the material box 100 is a conveying platform 200. The box body of the material box 100 is rectangular. The material box 100 includes a fixed plate 110, a discharge card plate 120 arranged parallel to the fixed plate, and a side baffle 130 arranged between the fixed plate 110 and the discharge card plate 120. The upper ends of the fixed plate 110 and the discharge card plate 120 are flush, and the height of the fixed plate 110 is greater than the height of the discharge card plate 120, and the height difference between the two is the thickness of the strip resin. The fixed plate 110 and the conveying platform 200 are fixedly connected at both ends by a supporting component, and the middle part is used to produce strip resin and convey the strip resin.

[0035] In order to improve efficiency and increase the conveying speed of the strip resin, a gap is provided between the fixed plate 110 and the conveying platform 200. A film holder 140 is provided on the outer side of the fixed plate 110. A roll film is loaded on the film holder 140. The film passes through the gap between the fixed plate 110 and the conveying platform 200 and passes out from the lower part of the discharge card plate. The conveying direction of the strip resin and the film is from the fixed plate 110 to the discharge card plate 120. After the liquid resin material flows into the material box, the liquid resin material is pulled out by the film to form a strip resin. A traction mechanism is provided at the end of the film to pull the integrated film and strip resin.

[0036] Better yet, in order to generate different types of guard plates, as shown in the figure, the outer side of the side baffle plate 130 is connected to a sliding mechanism that is clamped on the fixed plate 110 and the discharge clamp plate 120, and at the same time, a locking mechanism is provided on the sliding mechanism on one side of the fixed plate 110. Through this structure, the distance between the two side baffle plates 130 can be adjusted, thereby achieving adjustment of the width of the strip resin.

[0037] The conveying platform 200 may be a horizontal platform, and a traction mechanism is provided at the rear of the conveying platform 200 to convey the entire strip-shaped resin by dragging the film and strip-shaped resin assembly.

[0038] The part of the conveying platform 200 located at the lower part of the material box can also be a round roller, and the material box is on the upper part of the round roller. When the round roller rotates, the film and the strip-shaped resin on the upper part of the film are brought out. Since there is no adhesion between the film and the round roller, and the self-gravity of the strip-shaped resin adhered to it, the strip-shaped resin can be pulled out.

[0039] When the part of the conveying platform 200 located at the bottom of the material box is a round roller, if the production line is short, the film can be eliminated and a scraper is set at the bottom of the round roller to remove the strip resin. The other parts of the conveying platform 200 use evenly distributed rollers, which have a power mechanism to rotate and drive the strip resin to move.

[0040] After the strip resin is output, the processing of step 2 can be carried out immediately, or it can be directly collected as an intermediate product as a material for subsequent products. Since the strip resins covered with the film are isolated from each other, mixing of the strip resins can be avoided, and they can be stored as intermediate products.

[0041] Furthermore, the discharge card plate 120 at the front of the material box 100 is connected to both ends of the conveying platform 200 through a height-adjustable support component. The distance between the lower part of the discharge card plate 120 and the conveying platform can be adjusted to adjust the thickness of the strip resin.

[0042] Step 2: Add fiber material to one surface of the strip resin to form a composite resin. This step is used to add fiber to the resin material to increase its strength. Since the strength requirement for the anti-corrosion protective plate is relatively low, the amount added is less than the amount of fiber added to make cover plates, manhole covers, etc. The composite resin mentioned in this embodiment is a resin with added fibers, not a change in material.

[0043] When a mold is used for sheet fiber processing, after injecting liquid resin, continuous fibers or mesh fibers are laid on its surface. The continuous fibers are filamentous, linear or rope-shaped fiber materials made of fibers. The length of the continuous fibers is the same as the length of the strip resin, and all the continuous fibers are arranged in parallel at equal intervals. After laying, the mold can be die-cast or wait for natural mixing. The mesh fibers are mesh fabrics woven from fiber materials, and the fiber mesh is laid on the upper part of the liquid resin. The mesh fibers can be set in different mesh sizes as needed. If it is a short fiber of 3-60mm, the above-mentioned continuous fibers and mesh fibers are crushed and evenly sprinkled on the upper part of the liquid resin in the mold.

[0044] When extruding into sheets using an extrusion device, after the strip-shaped resin material is extruded, the strip-shaped resin is laid flat, and at the same time, a packaged fiber material is arranged in parallel on the upper part thereof, and the fiber material is a continuous fiber or a mesh fiber. After the fiber material and the strip-shaped resin are arranged in parallel, they enter an extrusion roller to extrude the fiber material and the strip-shaped resin into one. If short fibers are added, a crushing device is arranged on the upper part of the strip-shaped resin, and the packaged fibers are crushed into short fibers by the crushing device, and then the short fibers are naturally scattered on the strip-shaped resin during the process of traveling.

[0045] When the strip-shaped resin is prepared by using the molding equipment, a fiber material support 310 is arranged on the upper part of the conveying platform 200, and the rolled fiber material is mounted on the fiber material support 310. After the fiber material and the strip-shaped resin are arranged in parallel, they enter an extrusion roller to extrude the fiber material and the strip-shaped resin into one. Figure 2As shown, if short fibers are added, a crushing device 320 is set on the upper part of the strip-shaped resin, and the packaged fibers are crushed into short fibers by the crushing device 320, and then the short fibers are naturally scattered on the strip-shaped resin during the moving process.

[0046] After adding fiber material to the surface of the strip resin, especially after adding short fibers, the plane where the fiber material is located is in a relatively parallel state with the strip resin. That is, there is a fiber layer and a resin layer, and the intersection of the two mutually infiltrating parts is small. In order to enable the fiber layer and the resin layer to interact more fully, after the fiber crushing device 320 scatters the short fibers in step 2, a shaking and scattering device for resin particles is set at the rear of the crushing device 320. The resin particles are scattered on the upper part of the fiber layer. Then, the fiber layer is crushed by a rolling roller to make the short fibers sink into the resin, or the short fibers are bent and inserted into the resin. Or when the composite resin is processed in multiple layers in step 3, when two composite resins or composite resins are pressed with the strip resin, the resin particles are squeezed into the resin so that the fibers and resins are cross-mixed more fully. Among them, the shaking and scattering device is not shown in the figure. In order to adjust the doping amount of short fibers, the feeding speed of the crushing device can be adjusted. When the addition amount is large, the feeding speed increases.

[0047] As a corrosion-resistant guard plate, a smaller amount of fiber material can be used by the above method. This process can not only reduce the amount of short fibers, but also reduce the density of short fibers on the strip resin by increasing the conveying speed of the composite resin, thereby improving production efficiency. A certain temperature is maintained during die casting, so in the subsequent process, the resin particles will be integrated with the composite resin.

[0048] The resin particles can be spherical particles or strip particles. The radius of the spherical particles is between 1-3 mm. The diameter of the strip particles is 1 mm and the length is between 3-6 mm. Particles within this size range can ensure that they are completely melted during processing.

[0049] Step 3, superimpose the composite resin and at least one strip of resin or composite resin into a multi-layer resin. When producing anti-corrosion protective plates, it is generally adopted to press a piece of composite resin and a piece of strip of resin, that is, to sandwich the fiber layer between two strips of resin. In addition, the strip of resin or composite resin produced by this process can be arranged into multiple layers, and the multi-layer resin can be stored as an intermediate product and can be used for die-casting of cover plates, die-casting of manhole covers or die-casting of other products. When making a multi-layer resin with more than two layers, the above process can be applied to add fiber material between each layer.

[0050] As shown in the figure, if multi-layer resin is produced, a molding device can be added to the assembly line to prepare strip resin in real time, and the conveying platform 200 located at the lower part of the material box can be matched with a round roller and a scraper, that is, the use of film is reduced. If a stored strip resin or composite resin is used to prepare a multi-layer resin, the film needs to be removed before laminating the multiple layers.

[0051] The composite resins produced by two extrusion molding devices can be rolled and pressed together to prepare multi-layer resins. Alternatively, multiple molding devices can be provided, and the strip-shaped resins produced by the molding devices or the composite resins prepared by the molding devices can be pressed together by rolling rollers 400 to form multi-layer resins. The multi-layer resins are driven by traction and output to the multi-layer resin transfer bin, or are cut and sent to the die-casting mold for die-casting.

[0052] Better, in order to better remove the gas in the gap between the two strips of resin and increase the strength of the overall anti-corrosion guard plate, two rolling rollers 400 are provided, and a spiral rolling surface is provided on each rolling roller 400. The surface of the roller is provided with protrusions and depressions to produce a spiral surface. The two rolling rollers 400 are arranged front and back, and the spiral rolling surfaces of the two rolling rollers 400 are staggered to ensure that all the gas in the gap can be pressed and removed.

[0053] Further, in order to control the thickness of the final multi-layer resin, an adjustable and lockable sliding adjustment block is provided between the laminating roller 400 and the support for mounting and fixing the laminating roller 400. The thickness of the multi-layer resin is adjusted by adjusting the interval between the laminating roller 400 and the conveying platform 200.

[0054] Step 4, place the multi-layer resin into the mold for die-casting to form an anti-corrosion protective plate. Place the prepared multi-layer resin into the mold for die-casting. In this embodiment, a thermosetting resin is used, and the temperature and time for curing need to be maintained during die-casting. The temperature during hot pressing is 180°C, the pressure is 20 MPa, and the time is 350 seconds. In order to better facilitate construction, during the heating and curing process, the edge of the multi-layer resin extends to the outside of the mold. After molding, the protective plate has a flexible edge of a certain length, and the specific size of the flexible edge can be retained by cutting to form the final product. The flexible edge can be combined and connected with the waterproof component during the construction process. In the prior art, by first doping the fiber, the above-mentioned product with a flexible edge cannot be produced in the process of press molding.

[0055] The following is a specific description of the process for producing an anti-corrosion protective plate with two layers of multi-layer resin as an example.

[0056] First, a liquid resin is prepared. In this example, a mixture of epoxy resin and low-shrinkage unsaturated polyester resin is used as the material, and then it is liquefied to make it have flow properties.

[0057] The first step is to make the liquid resin into a sheet or strip. A molding device is used in this step. First, the height difference between the discharge card plate 120 of the molding device and the lower part of the fixed plate 110 is adjusted to 2 mm, that is, the thickness of the liquid resin flowing out of the material box 100 is less than 2 mm. Then, the roll film is installed on the film holder 140 and the film is passed through the lower part of the material box 100, and then guided to the traction device and finally to the product storage device. Since the multi-layer resin in this example is two layers, two molding devices are required. Figure 2 As shown, the first molding device is arranged at the lower part, and the other is arranged at the upper part of the lower conveying platform 200. The parameters of the second molding device at the upper part are also adjusted, and the thickness adjustment can be set as needed. In this example, the thickness of the two strip resins is less than 2 mm.

[0058] After the molding equipment is set up, the fiber package needs to be installed on the fiber material support 310. If a fiber web or multiple bundles of continuous fibers are assumed between two strips of resin, the fibers need to be introduced between two films and passed through the traction mechanism with the films. For ease of operation, a film can be inserted first, then the fibers, and finally a layer of film can be inserted.

[0059] If short fibers are added, a crushing device 320 is provided at the bottom of the fiber material support 310. The fiber package is then introduced into the crushing device. The molding equipment is equipped with a conveying platform, and finally two strips of resin are compounded on a conveying platform 200.

[0060] After the hardware configuration is completed, the software configuration needs to be carried out. The software configuration includes the feed speed of the crushing mechanism, the length of the crushed short fibers, the forward speed of the traction mechanism, etc.

[0061] After that, the liquid resin material is introduced into the material box 100 through the flow channel. After flowing into the material box ⅔ of the volume, the feed flow rate of the liquid resin is set, and the entire assembly line is started, that is, it starts to move on the conveying platform 200. During the movement of the film, the liquid resin flows out with the film and adheres to the film to form a strip of resin. The strip of resin moves on the conveying platform, and when passing through the crushing device, the scattered short fibers adhere to the surface of the strip of resin. At the same time, the strip of resin of the second molding device is turned over and the side not covered with the film is bonded with the strip of resin of the conveying platform 200 configured by the lower molding device. The two are rolled into one by the rolling roller 400. If the crushing device 320 is not provided, the mesh fibers or multiple bundles of continuous fibers are sandwiched between the two strips of resin.

[0062] Finally, the prepared multilayer resin is taken out, cut, and the films on both sides are removed. The flexible multilayer resin is placed in the mold, and then high-temperature die-casting and curing are performed to finally form an anti-corrosion protective plate. Since the intermediate product multilayer resin is flexible, its edge is not within the mold when it is laid into the mold, that is, a portion of the multilayer resin is reserved and not thermoset. After molding, the reserved external flexible portion can be cut to form the final product.

[0063] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Through the above description, relevant staff can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the contents of the specification. All so-called equal changes and modifications of the shapes, structures, features and spirits described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A production process for anti-corrosion guard plates for road and bridge concrete guardrails, characterized in that The following steps are involved: Step 1, forming a liquid resin material into a strip-shaped resin; Step 2, adding fiber material to one surface of the strip resin to form a composite resin; Step 3, stacking the composite resin and at least one strip of resin or composite resin into multiple layers of resin; Step 4: Place the multi-layer resin into a mold and perform hot pressing to form an anti-corrosion protective plate, wherein the temperature during hot pressing is 180° C., the pressure is 20 MPa, and the duration is 350 seconds.

2. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 1 is characterized in that: In the step 1, a molding device is used to prepare a strip of resin. The molding device comprises a material box (100) and a conveying platform (200) arranged at the bottom of the material box (100). A notch is arranged at the bottom of one side of the material box (100). The resin flowing out of the notch under the drive of the conveying platform (200) forms a strip of resin.

3. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 2 is characterized in that: A film support (140) is provided on one side of the material box (100), and a rolled film is installed on the upper part of the film support (140). The film is spread on the upper part of the conveying platform (200) and drives the strip-shaped resin to move.

4. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 1, 2 or 3, characterized in that: In the step 2, the fiber material is continuous fiber or mesh fiber.

5. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 1, 2 or 3, characterized in that: In the step 2, the fiber material is short fibers, and the length of the short fibers is 3-60 mm.

6. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 5 is characterized in that: In the step 2, short fibers are evenly sprinkled on the upper part of the strip-shaped resin, and then resin particles are evenly sprinkled.

7. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 6 is characterized in that: The resin particles are spherical particles, and the diameter of the spherical particles is 1-3 mm.

8. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 6 is characterized by: The resin particles are strip-shaped particles, and the diameter of the strip-shaped particles is 1 mm and the length is 3-6 mm.

9. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 6, 7 or 8, characterized in that: In the step 3, the composite resin and the strip-shaped resin or the composite resin are pressed into a multi-layer resin by a rolling roller (400).

10. The production process of an anti-corrosion guard plate for a road and bridge concrete guardrail according to claim 9 is characterized in that: Two rolling rollers (400) are provided, and a spiral surface is provided on the upper portion of the rolling roller (400), and the spiral surfaces on the upper portions of the two rolling rollers (400) are arranged in a staggered manner.

Images