SYSTEM AND METHOD FOR CASTING RETAINING WALLS FROM RECYCLED PLASTIC WASTE

Abstract

The invention relates to a system for casting retaining wall blocks from recycled waste plastic and a method for casting retaining wall blocks from recycled waste plastic, providing time and labor savings in washing and sorting impurities, which are foreign substances mixed with waste plastic, and enhancing the tensile strength of the retaining wall blocks with such foreign substances. In the invention, the load or tensile strength of the retaining wall block is increased by filling the interior of the retaining wall block with concrete or mixed stones, thereby enabling the retaining wall block to be used for various purposes. In addition, in the invention, the unavoidable generation of toxic substances during combustion can be prevented by setting the temperature at or below a predetermined temperature during casting and solidification, thereby providing an environmentally friendly effect.

Description

Recycled waste plastic retaining wall block forming system and method

[0001] The present invention relates to a system and method for forming a waste plastic recycling retaining wall block, and more specifically, to an environmentally friendly method for manufacturing a waste plastic recycling retaining wall block by injection-molding it into a final block shape at different temperatures set for each section so that the tensile strength of the retaining wall block can be increased by the foreign substances, while saving time and effort for washing and sorting impurities mixed with waste plastic.

[0002]

[0003] In general, various types of waste synthetic resins or waste plastics that are thrown away as waste are landfilled or incinerated, but in this case, they cause pollution of the surrounding soil or air environment, so methods of recovering and recycling them are being actively researched.

[0004] In fact, the central government as well as each local government is sparing no effort in supporting the development of technology to produce products that do not pose a major problem in use, even if the quality is slightly lower, by recycling waste synthetic resins instead of landfilling or incinerating them. In line with this, the related industry is spurring the development of technology to melt waste synthetic resins by heating and then remolding them for use.

[0005] For example, in Korean Patent Publication No. 10-2001-0104383 "Method for Recycling PET Bottle Fragments and Execution Device Thereof," crushed PET bottle fragments are washed and regenerated through a complex pretreatment process in which they are treated in at least one washing machine with a washing solution containing caustic soda at a high temperature of 70°C or higher for at least 20 minutes, which causes wastewater treatment problems and is not economically beneficial for manufacturing recycled products.

[0006] Meanwhile, Korean Patent No. 10-2303457, "Cylinder heating device for pipe forming system using waste synthetic resin," proposes a pipe forming system using waste synthetic resin that uses a pipe-type heater rather than a bend-type heater to prevent heat loss during heat transfer to the cylinder, thereby melting waste synthetic resin within the first and second spaces within the cylinder in a short period of time and thereby improving the quality of the formed pipe.

[0007] The above patented technology is provided in a cylinder (1) and a heater (5) that generates heat is a pipe-type heater (53), and a plurality of heater insertion grooves (11) are formed on the outer circumference of the cylinder (1) at a constant interval along the circumferential direction of the cylinder while maintaining a constant distance along the longitudinal direction of the cylinder, and a pipe-type heater is inserted into each of the heater insertion grooves.

[0008] (53) is inserted, and a heater cover (12) is detachably connected by a screw (13) to prevent each pipe-type heater (52) inserted into each heater insertion groove (11) from coming out around the outer circumference of the cylinder (1) and to prevent heat generated from the pipe-type heater from escaping to the outside, so that the pipe is continuously produced.

[0009] However, when forming a pipe as described above, waste plastic must be carefully pre-processed through a sorting and crushing process in advance. However, it is nearly impossible to wash waste plastic bottles thoroughly, and it is also difficult to maintain their shape during forming, which has limited their use.

[0010] Accordingly, the applicant, while developing a recycled product using waste plastic from various angles, confirmed that by using waste plastic to manufacture a retaining wall block that performs a structural role by being used in a part buried in the soil such as an inconspicuous slope or embankment, even if the quality is slightly lower, the tensile strength of the retaining wall block can be increased by melting it while including impurities as foreign substances, and thus completed the present invention.

[0011]

[0012] The present invention is intended to solve the above problems, and provides an environmentally friendly method for forming waste plastic recycling retaining wall blocks by injection molding them into a final block shape at different temperatures set for each section so that the tensile strength of the retaining wall blocks can be increased by the foreign substances, saving time and effort for washing and sorting foreign substances mixed with waste plastic.

[0013] However, the purposes of the present invention are not limited to the purposes mentioned above, and other purposes not mentioned will be clearly understood by those skilled in the art from the description below.

[0014]

[0015] In order to achieve the above purpose, the waste plastic recycling retaining wall block forming process method according to the embodiment of the present invention may include a waste plastic recycling retaining wall block forming system (1) including a crushing device (100), a step-by-step heating device (200), a sequential extrusion device (300), a water pipe (400), and a control device (500).

[0016] In addition, the present invention comprises a first step in which a control device (500) inputs waste plastic into a step-by-step heating device (200); and

[0017] It is characterized in that it includes a second step of controlling the temperature of each pipe-type electric heater (210) so that waste plastic moving to the pipe-type electric heater (210) formed in a plurality of units within the step-by-step heating device (200) is heated by heat and melted into a liquid state;

[0018] At this time, the present invention can provide a waste plastic recycling retaining wall block forming process method characterized in that it further includes a third step in which, after the second step, a control device (500) provides waste plastic liquid through a discharge module to a sequential extrusion device (300) to form the waste plastic liquid into a retaining wall block through extrusion.

[0019] In addition, the present invention can provide a method for forming a retaining wall block for recycling waste plastic, characterized in that it further includes a third step: controlling the movement of the sequential extrusion device (300) that rotates in a vertical or horizontal loop shape formed in the sequential extrusion device (300) in the state of the extruded waste plastic liquid that has been injected into each mold for forming a retaining wall block of the sequential extrusion device (300) through a discharge module after the third step:

[0020] In addition, the present invention can provide a method for forming a retaining wall block for recycling waste plastic, characterized in that it further includes a fourth step in which, after the third step, a control device (500) performs demolding of a retaining wall block within a mold in which cooling has been performed through a water pipe (400) that is in close contact with the mold.

[0021] In order to achieve the above object, a waste plastic recycling retaining wall block forming system according to an embodiment of the present invention may be characterized by including a step-by-step heating device (200) formed for liquefying waste plastic; and a control device (500) for controlling the temperature of each pipe-type electric heater (210) formed in a plurality within the step-by-step heating device (200) so that waste plastic moving to the pipe-type electric heater (210) is heated by heat and melted into a liquid state.

[0022] In addition, the present invention further includes a sequential extrusion device (300), and a control device (500) can provide a waste plastic recycling retaining wall block forming system characterized in that it provides waste plastic liquid through a discharge module to the sequential extrusion device (300) and performs forming into a retaining wall block through extrusion.

[0023] In addition, the present invention can provide a waste plastic recycling retaining wall block that can increase weight or tensile strength by filling the outer waste plastic molded part formed according to the above waste plastic recycling retaining wall block forming process method and the interior with concrete structures or gravel.

[0024]

[0025] The present invention provides a system for forming a waste plastic recycling retaining wall block and a process method for forming a waste plastic recycling retaining wall block, which saves time and effort for washing and classifying impurities mixed with waste plastic and provides the effect of increasing the tensile strength of the retaining wall block by removing the impurities.

[0026] In addition, the present invention can be utilized for various purposes by filling the inside of a retaining wall block with concrete or gravel to increase the load or increase the tensile strength.

[0027] In addition, the present invention provides an environmentally friendly effect by preventing the generation of harmful gases that are inevitably generated during the incineration process by melting and then solidifying the material at a temperature lower than a preset temperature during the molding process.

[0028]

[0029] FIG. 1 is a drawing showing a waste plastic recycling retaining wall block forming system (1) according to an embodiment of the present invention.

[0030] FIG. 2 is a drawing showing a process for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention.

[0031] FIG. 3 is a drawing for explaining a step-by-step heating device (200) used in a method for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention.

[0032] FIG. 4 is a drawing showing a retaining wall block formed from waste plastic according to a method for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention.

[0033] Figure 5 is a photo of a retaining wall block construction example.

[0034]

[0035] Hereinafter, a detailed description of preferred embodiments of the present invention will be provided with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention.

[0036] In this specification, when a component 'transmits' data or a signal to another component, it means that the component can transmit the data or signal directly to the other component, or can transmit the data or signal to the other component via at least one other component.

[0037] FIG. 1 is a drawing showing a system (1) for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention. FIG. 2 is a drawing showing a process method for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention. FIG. 3 is a drawing for explaining a step-by-step heating device (200) used in a process method for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention. FIG. 4 is a drawing showing a retaining wall block formed from waste plastic according to a process method for forming a waste plastic recycling retaining wall block according to an embodiment of the present invention, and FIG. 5 is a photograph of a case of retaining wall block construction.

[0038] First, referring to FIG. 1, the waste plastic recycling retaining wall block forming system (1) may include a crushing device (100), a step-by-step heating device (200), a sequential extrusion device (300), a water pipe (400), and a control device (500).

[0039] Next, referring to FIG. 2, the method for forming a waste plastic recycling retaining wall block may include a waste plastic crushing process (S11), a moisture removal process (S12), a step-by-step heating device feeding process (S13), a temperature control process using a pipe-type electric heater (210) (S14), a sequential extrusion device feeding process (S15), a cooling process using a water pipe (S16), a demoulding process at a preset time (S17), a re-input process into a demoulding area (S18), and a process for determining whether a preset number of pieces has been completed (S19). In this case, the crushing process (S11) using a crushing device (100) may be omitted.

[0040] More specifically, in the waste plastic crushing process (S11), the control device (500) can crush the waste plastic provided through the crushing device (100) within a preset range that can be fed into the step-by-step heating device (200), and the preset range can be within the diameter of the hopper of the step-by-step heating device (200), but is not limited thereto.

[0041] After step (S11), in the moisture removal process (S12), the control device (500) can perform a process to remove moisture from the shredded waste plastic through natural drying or to dry the shredded waste plastic through a dryer (not shown) so that the moisture content on the waste plastic is set to a preset level or lower.

[0042] After step (S12), in the step-by-step heating device input process (S13), the control device (500) inputs the waste plastic that has been dried according to step (S12) into the step-by-step heating device (200). The step-by-step heating device (200) may include a moving module that receives the waste plastic and moves it from one side to the other, a heating module that melts the moved waste plastic into a liquid state while being heated by heat, and a discharge module that discharges the melted liquid waste plastic liquid. The step-by-step heating device input process (S13) may be performed by a process in which the control device (500) provides the waste plastic to a hopper connected to be provided to the moving module.

[0043] After step (S13), the temperature control process (S14) by the pipe-type electric heater (210) is performed by the heating module of the step-by-step heating device (200) that melts the above-described moving waste plastic into a liquid state by heating it with heat, and the heating module is a metal tube-shaped cylinder that is horizontally adjacent to each other and has a first space and a second space communicated with each other inside, a hopper that is connected to the above-described moving module and is integrally formed at the upper part of the inlet side of the cylinder so that waste plastic can be fed into the cylinder from the outside, a first rotating screw that is rotatably coupled to the first space in the cylinder and receives the driving force of the motor through a power transmission means and rotates primarily to impart a moving force toward the outlet side to the waste plastic fed into the cylinder through the hopper, and a second rotating screw that is rotatably coupled to the second space in the cylinder and receives the rotational force of the first rotating screw through a rotational power transmission means and rotates secondarily to It may include a second rotating screw that provides a moving force to the waste plastic toward the outlet side together with the first rotating screw, and a pipe-type electric heater (210) that is provided on the outside of the cylinder and heats the cylinder so that the waste plastic moving from the inlet side to the outlet side within the cylinder due to the rotation of the first and second rotating screws is melted into a liquid state.

[0044] Meanwhile, the pipe-type electric heater (210) is individually formed inside or outside the divided cylinder area in a state where the cylinder is divided into divided areas by an insulation layer (220) as shown in FIG. 3, so that step-by-step temperature control for the formed individual area can be performed according to the control of the control device (500). At this time, in order to lower the temperature, a cooling water pipe (not shown) can be installed step by step as needed and can be adjusted according to the control unit. Meanwhile, such a pipe-type electric heater (210) can be formed in a form connected to the above-described discharge module that discharges molten liquid waste plastic liquid.

[0045] Here, the discharge module is integrally formed at the lower part of the outlet side of the cylinder and includes a discharge port for discharging liquid waste plastic liquid to the outside of the cylinder according to the rotation of the first and second rotating screws, and the cylinder is positioned at a certain height from the ground through a base (230), and the base (230) may be formed of a metal plate as shown in FIG. 3, but may be changed to an insulating material that is not limited thereto.

[0046] Accordingly, when a worker operates a pipe forming system using waste plastic, a first rotating screw rotatably coupled to a first space within a cylinder receives driving force of a motor (not shown) through a power transmission means and rotates in a first direction (e.g., clockwise, which is a reverse direction) and a second rotating screw receives the rotational force of the first rotating screw through another power transmission means and rotates in a second direction (e.g., counterclockwise, which is a forward direction) as shown in the drawing, and at the same time, a pipe-type electric heater (210) provided on the outside of the cylinder operates so that the cylinder is heated in stages, and the control device (500) can control this.

[0047] Here, the pipe-shaped electric heater (210) formed by dividing into multiple parts can be controlled by a control device (500) starting from the first temperature and then going to the nth temperature (n is a natural number greater than or equal to 2) for each step to melt foreign substances contained in the waste plastic.

[0048] In a more specific example, the first pipe-type electric heater (210) starts at 130°C, the second pipe-type electric heater (210) starts at 170°C, the third pipe-type electric heater (210) starts at 200°C, the fourth pipe-type electric heater (210) starts at 170°C, and the fifth pipe-type electric heater (210) starts at 260°C.

[0049] The sixth pipe-type electric heater (210) can be controlled by the control device (500) to 130°C.

[0050] That is, for a specific example, waste plastic liquefies at 260°C and changes into a gel state, and the reason why the control device (500) controls the sixth pipe-type electric heater (210) to 130°C is to maintain the liquefied gel-state waste plastic liquid in a gel state, and 130

[0051] The control device (500) performs a control to increase the temperature step by step for each pipe-type electric heater (210) at different temperatures for each type of waste plastic that can be melted in steps corresponding to ℃, 170℃, 200℃, and 260℃. The reason for lowering the temperature once before the final temperature step, such as 200℃ for the third pipe-type electric heater (210), 170℃ for the fourth pipe-type electric heater (210), and 260℃ for the fifth pipe-type electric heater (210), is to eliminate the side effect of impurities corresponding to unmelted foreign substances making it difficult to maintain a crystal state due to continued heating, and to maintain the crystal state of each part by not liquefying each plastic at once. That is, since some of the plastic vaporizes above 260℃, a process of 170℃ is formed for a short time less than the preset time to melt slightly less waste plastic.

[0052] By creating a tick state, we can add a crystallization process that holds the materials together by allowing less soluble substances to penetrate between the finally created retaining wall blocks.

[0053] In addition, when melting, the washing and sorting of waste plastic is omitted, and the temperature difference is set at each stage so that foreign substances such as fibers or metals are melted together and introduced, and the foreign substances are created together with the waste plastic liquid as a component of the molded retaining wall block, and when pure plastic is melted, it comes out as a PET bottle or a plastic bottle, but these have foreign substances in them, so by forming them into a retaining wall block in the form of foreign substances that hold each other together, it can provide the effect of saving time and effort in the washing and sorting process.

[0054] After step (S14), in the input process (S15) to the sequential extrusion device (300), after the liquid has been liquefied step by step in step (S14), the control device (500) can provide the waste plastic liquid through the discharge module to the sequential extrusion device (300) to perform extrusion to form it into a retaining wall block.

[0055] After step (S15), in the cooling process (S16) using the water pipe, if the extrusion is performed in a liquefied state and it does not cool down, the shape will be scattered, so the control device (500) controls the liquefied plastic liquid to be injected into a mold for forming a retaining wall block of the sequential extrusion device (300) through a discharge module, and then to be moved by the movement module of the sequential extrusion device (300) that rotates in a vertical or horizontal loop shape formed in the sequential extrusion device (300) in the state of the extruded waste plastic liquid injected into each mold.

[0056] Here, a water channel (400) is formed in close contact with the moving module of the sequential extrusion device (300) of the advancing region, through which the molding mold moves, so that the control device (500) can perform cooling through the water channel (400).

[0057] After step (S16), in the demolding process (S17) at a preset point in time, a water channel (400) is formed in close contact with the moving module through which the mold moves in the moving module of the sequential extrusion device (300) of the region advancing according to step (S16), so that when cooling is performed through the water channel (400), and the moving module of the sequential extrusion device (300) advances at a step m (m is a natural number greater than or equal to 2), demolding of the retaining wall block can be performed from the mold under the control of the control device (500) at a preset step mL (L is a natural number less than m and greater than or equal to 1), and in reality, if the temperature is lowered, it shrinks and demolding is easy, but it is preferable that a separate external force providing device (not shown) for demolding is provided. The demolded retaining wall block may be as shown in FIG. 4.

[0058] Thereafter, the control device (500) can control the molding mold, which has undergone demolding while moving along the loop of the moving module, to be positioned so that the initially liquefied plastic liquid is injected into the molding mold for forming a retaining wall block of the sequential extrusion device (300) through the discharge module, and the moving module can be a moving device including a conveyor belt or the like.

[0059] That is, in the case where there are 10 molds moving along the moving module of the sequential extrusion device (300), a water channel (400) is formed around the periphery, and when it reaches the 9th time, it cools down and is demolded, and then the process can be performed in such a way that the control device (500) controls the molds to return after the demolding.

[0060] After step (S17), in the re-introduction process (S18) into the demolding area, the control device (500) can provide waste plastic liquid through a discharge module to a sequential extrusion device (300) equipped with a returned demolded mold to perform extrusion to form a retaining wall block.

[0061] After step (S18), in the process of determining whether the preset number is completed (S19), the control device (500) compares the number of retaining wall blocks counted so far in the re-input process of step (S18) with the preset molding number, and if the number is the same, the control device (500) does not proceed with the sequential extrusion device input process (S15) and the next re-input process (S18) for any more retaining wall blocks, but only completes the molding of the retaining wall blocks in the mold in the current moving module and ends the fixing. On the other hand, if the number of retaining wall blocks counted through comparison with the preset molding number is insufficient, at least one of the process (S15) and the re-input process (S18) into the demolding area is performed so that additional retaining wall block molding can be performed until the number matches the preset molding number.

[0062] Through this process, not only is the tensile strength standard of the retaining wall block raised by the impurities, which are foreign substances, but also the waste plastic retaining wall block, which can be produced in the form of Fig. 4, can be used in various places as concrete or gravel, and it can provide the advantage of not generating carcinogenic substances in the process of burning to the extent of re-forming by melting and re-solidifying it by setting it below a preset temperature during the forming process.

[0063] The present invention can also be implemented as computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all types of recording devices that store data that can be read by a computer system.

[0064] Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and also those implemented in the form of carrier waves (e.g., transmission over the Internet).

[0065] Additionally, the computer-readable recording medium can be distributed across network-connected computer systems, allowing computer-readable code to be stored and executed in a distributed manner. Furthermore, functional programs, codes, and code segments for implementing the present invention can be readily inferred by programmers in the technical field to which the present invention pertains.

[0066] The present invention provides a system for forming a waste plastic recycling retaining wall block and a process method for forming a waste plastic recycling retaining wall block, which saves time and effort for washing and classifying impurities mixed with waste plastic and provides the effect of increasing the tensile strength of the retaining wall block by removing the impurities.

[0067] In addition, the present invention can be utilized for various purposes by filling the inside of a retaining wall block with concrete or gravel to increase the load or increase the tensile strength.

[0068] In addition, the present invention provides an environmentally friendly effect by melting and re-solidifying at a temperature lower than a preset temperature during the molding process, thereby preventing the generation of harmful substances that are inevitably generated during the incineration process.

[0069] As described above, the present specification and drawings have disclosed preferred embodiments of the present invention, and although specific terms have been used, they have been used in a general sense only to easily explain the technical contents of the present invention and to help understand the invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modified examples based on the technical idea of ​​the present invention are possible in addition to the embodiments disclosed herein.

Claims

1. A method for forming a waste plastic recycling retaining wall block, characterized by comprising: a first step in which a control device (500) inputs waste plastic into a step-by-step heating device (200) with differentiated temperatures; and a second step in which the control device (500) controls the temperature of each pipe-type electric heater (210) formed in a plurality of pipes in the step-by-step heating device (200) so that waste plastic is heated by heat and melted into a liquid state.

2. In claim 1, A method for forming a waste plastic recycling retaining wall block, characterized in that it further includes a third step in which, after the second step, a control device (500) provides waste plastic liquid through a discharge module to a sequential extrusion device (300) to form the waste plastic liquid into a retaining wall block through extrusion.

3. In claim 2, A method for forming a retaining wall block from recycled waste plastic, characterized in that it further comprises a third step: wherein the control device (500) controls the liquefied plastic liquid to be injected into a mold for forming a retaining wall block of a sequential extrusion device (300) through a discharge module, and then the extruded waste plastic liquid injected into each mold is moved by the movement module of the sequential extrusion device (300) that rotates in a vertical or horizontal loop shape formed in the sequential extrusion device (300).

4. In claim 3, A method for forming a retaining wall block for recycling waste plastic, characterized in that it further includes a fourth step in which, after the third step, cooling is performed through a water pipe (400) that is in close contact with the forming mold, the control device (500) performs demolding of the retaining wall block within the forming mold in which cooling has been performed.

5. A waste plastic recycling retaining wall block forming system characterized by including a step-by-step heating device (200) formed for liquefaction of waste plastic; and a control device (500) for controlling the temperature of each pipe-type electric heater (210) formed in multiple numbers within the step-by-step heating device (200) so that waste plastic moving to the pipe-type electric heater (210) is heated by heat and melted into a liquid state.

6. In claim 5, A waste plastic recycling retaining wall block forming system further comprising a sequential extrusion device (300); and a control device (500) configured to provide waste plastic liquid through a discharge module to the sequential extrusion device (300) and perform forming into a retaining wall block through extrusion.

7. A waste plastic recycled retaining wall block manufactured by the method of claim 1 to 4, wherein the outer waste plastic molded part is molded according to the molding process method and the interior is filled with concrete structures or gravel to increase the weight or tensile strength.

Images