Waste plastic regenerated retaining wall building block forming system and method

Abstract

The invention relates to a waste plastic regenerated retaining wall building block forming system and a waste plastic regenerated retaining wall building block forming process method, which can save time and manpower for cleaning and screening foreign matters and impurities mixed in waste plastics and can improve the tensile strength of retaining wall building blocks through foreign matters. In addition, the retaining wall building block is filled with concrete or broken stones, the bearing capacity can be improved, the tensile strength can be enhanced, and therefore multifunctional application is achieved, in addition, the temperature in the forming process is set to be lower than a preset value, and the retaining wall building block is formed through the mode that the concrete or the broken stones are melted and then solidified. Harmful substances inevitably generated in the sintering process can be effectively inhibited, and therefore the environment-friendly effect is achieved.

Description

Technical Field

[0001] This invention relates to a molding system and method for recycled waste plastic retaining wall blocks. More specifically, it relates to an environmentally friendly method for manufacturing recycled waste plastic retaining wall blocks by controlling the temperature of each section to achieve final injection molding into retaining wall block form. This method saves time and manpower for separately cleaning and screening foreign matter and impurities mixed in waste plastic, and the presence of foreign matter can actually improve the tensile strength of the retaining wall blocks. Background Technology

[0002] Typically, various waste synthetic resins or waste plastics are landfilled or incinerated when treated as garbage. At this time, these wastes will pollute the surrounding soil and air environment. Therefore, how to recycle and reuse these materials has become a hot research topic.

[0003] In fact, not only the central government, but also local governments are actively supporting the development of related technologies, striving to produce products that, although slightly inferior in quality, do not pose major problems in use, through reuse rather than landfilling or incinerating waste synthetic resins. In response, related industries are accelerating the development of technologies that utilize waste synthetic resins by heating, melting, and remolding them.

[0004] For example, in Korean Patent Publication No. 10-2001-0104383, "Method for Regenerating PET Bottle Fragments and Apparatus Thereof", it is proposed that the broken PET bottle fragments need to be cleaned and processed in at least one or more washing machines at a high temperature of 70°C for at least 20 minutes using a cleaning solution containing caustic soda. Since regeneration can only be achieved through complex pretreatment steps, it will cause wastewater treatment problems, and it is also difficult to manufacture recycled products in terms of economics, so it will not bring substantial benefits.

[0005] On the other hand, Korean Patent No. 10-2303457, "Cylinder Heating Device for Conduit Molding System Using Waste Synthetic Resin," proposes a conduit molding system using waste synthetic resin that eliminates heat loss during cylinder heat transfer by using a tubular rather than a strip heater for heat conduction, and also enables the waste synthetic resin to melt rapidly in the first and second space regions within the cylinder, while ensuring that the conduit formed thereby has excellent quality.

[0006] In the aforementioned patented technology, the heater 5 disposed on the cylinder 1 and used to generate heat is a tubular heater 53. Multiple heater insertion slots 11 are formed on the outer circumferential surface of the cylinder 1 at predetermined intervals along the circumference of the cylinder and at predetermined distances along the length of the cylinder. A tubular heater 53 is inserted into each of these heater insertion slots. A heater cover 12 is detachably attached to the outer periphery of the cylinder 1 by screws 13. It not only prevents the tubular heaters 52 inserted into the heater insertion slots 11 from dislodging, but also prevents the heat generated by the tubular heaters from dissipating outward, thereby enabling continuous production of conduits.

[0007] However, as mentioned above, when molding the conduit, the waste plastic must undergo meticulous pretreatment such as sorting and crushing. However, it is almost impossible to thoroughly clean the inside of each waste plastic bottle. In addition, it is difficult to maintain its shape stability during the molding process, thus limiting its practical application.

[0008] Accordingly, in the process of developing and utilizing recycled products from waste plastics from multiple perspectives, the applicant discovered that even if the quality of products made from waste plastics is slightly reduced, retaining wall blocks, which are buried in the soil and play a structural role in areas that are not easily noticed by the outside world, can actually improve the tensile strength of the retaining wall blocks and achieve effective utilization by melting foreign impurities together, thus completing the present invention. Summary of the Invention

[0009] Technical problems to be solved The present invention is proposed in view of the aforementioned problems, and its purpose is to provide an environmentally friendly method for molding recycled waste plastic retaining wall blocks by controlling the injection molding of retaining wall blocks by setting different temperatures for each section, thereby saving time and manpower for separate cleaning and screening of foreign matter and impurities mixed in waste plastics, and improving the tensile strength of the retaining wall blocks by removing foreign matter.

[0010] However, the purpose of this invention is not limited to the uses mentioned above. Other purposes not specifically described below will be clearly understood by those skilled in the art upon reading the following description.

[0011] Technical solution To achieve the aforementioned objective, the waste plastic recycled retaining wall block molding system 1, manufactured by the waste plastic recycled retaining wall block molding process according to an embodiment of the present invention, may include a crushing device 100, a grading heating device 200, a sequential extrusion device 300, a guide pipe 400, and a control device 500.

[0012] Furthermore, the present invention includes: a first step in which the control device 500 feeds waste plastic into a temperature-differentiated grading heating device 200; and In the second step, the control device 500 is used to adjust the temperature of each tubular electric heater 210, so that the waste plastic that has moved to the multiple tubular electric heaters 210 formed in the graded heating device 200 is heated and melted into a liquid state under the action of heat.

[0013] At this point, the invention further includes a third step: after completing the second step described above, the control device 500 conveys waste plastic liquid to the sequential extrusion device 300 through the discharge module, and forms it into retaining wall blocks through the extrusion process.

[0014] Furthermore, the present invention also includes a third step, in which, after completing the above third step, the control device 500 injects the liquefied plastic liquid through the discharge module into the molding die of the sequential extrusion device 300 for forming retaining wall blocks, and moves it through the moving module formed on the sequential extrusion device 300 which rotates along a vertical or horizontal annular structure while the waste plastic liquid is being extruded into each molding die.

[0015] In addition, the present invention also includes a fourth step: after completing the third step above, when the mold is cooled by the tightly fitted guide pipe 400, the control device 500 performs a demolding operation on the retaining wall block in the mold that has been cooled.

[0016] To achieve the above objectives, the waste plastic recycled retaining wall block molding system according to an embodiment of the present invention is characterized by comprising: a graded heating device 200 for liquefying waste plastic; and a control device 500 for adjusting the temperature of each tubular electric heater 210 so that the waste plastic melts into a liquid state after being heat-treated when it moves through the multiple tubular electric heaters 210 in the graded heating device 200.

[0017] In addition, the present invention also includes a sequential extrusion device 300, and a control device 500 provides waste plastic liquid to the sequential extrusion device 300 through a discharge module, which is then formed into retaining wall blocks through an extrusion molding process.

[0018] Furthermore, the present invention improves the weight or tensile strength by forming an outer waste plastic molded part and an inner filled concrete structure or crushed stone in accordance with the waste plastic recycled retaining wall block molding process.

[0019] Beneficial effects This invention relates to a waste plastic recycled retaining wall block molding system and a waste plastic recycled retaining wall block molding process, which can save time and manpower in cleaning and screening foreign matter and impurities mixed in waste plastic, and can improve the tensile strength of retaining wall blocks by removing foreign matter.

[0020] Furthermore, by filling the retaining wall blocks with concrete or crushed stone, the present invention can improve both the load-bearing capacity and tensile strength, thereby achieving a multi-functional application.

[0021] Furthermore, by setting the temperature during the molding process to a lower than a preset value, and by melting and then solidifying, the present invention can effectively suppress the harmful gases that are inevitably generated during the sintering process, thereby achieving an environmental protection effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating a waste plastic recycled retaining wall block molding system 1 according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the molding process of waste plastic recycled retaining wall blocks according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the graded heating device 200 used in the waste plastic recycled retaining wall block molding process according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram illustrating the waste plastic retaining wall blocks formed by the waste plastic recycled retaining wall block molding process according to an embodiment of the present invention.

[0026] Figure 5 Photos show examples of retaining wall block construction. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of relevant well-known functions or structures will be omitted if it is believed that such descriptions might unnecessarily obscure the essence of the invention.

[0028] In this specification, when a component “transmits” data or signals to another component, it means that the component can either transmit the data or signals directly to the other component or transmit the data or signals to the other component through at least one other component.

[0029] Figure 1 This is a schematic diagram illustrating a waste plastic recycled retaining wall block molding system 1 according to an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the molding process of waste plastic recycled retaining wall blocks according to an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the graded heating device 200 used in the waste plastic recycled retaining wall block molding process according to an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the process of molding waste plastic recycled retaining wall blocks according to an embodiment of the present invention. Figure 5 Photos show examples of retaining wall block construction.

[0030] First, such as Figure 1 As shown, the waste plastic recycled retaining wall block molding system 1 may include a crushing device 100, a grading heating device 200, a sequential extrusion device 300, a guide pipe 400, and a control device 500.

[0031] Next, refer to Figure 2 The waste plastic recycled retaining wall block molding process includes: waste plastic crushing step S11, moisture removal step S12, feeding using a graded heating device S13, temperature control via tubular electric heater 210 S14, feeding via sequential extrusion device S15, cooling via water pipe S16, demolding at a preset time point S17, re-feeding into the demolding area S18, and determining whether a preset quantity has been reached and whether the process is complete S19. Among these steps, the crushing step S11 performed by the crushing device 100 can be omitted.

[0032] More specifically, in the waste plastic crushing step S11, the control device 500 can crush the waste plastic provided by the crushing device 100 using the grading heating device 200 within a preset range that can be fed in. The preset range can be within the diameter of the hopper of the grading heating device 200, but is not limited to this.

[0033] After step S11, in the moisture removal step S12, the crushed waste plastic can be dried naturally or dried using a dryer (not shown) to reduce the moisture content of the waste plastic to below a preset value. The above process can be controlled and executed by the control device 500.

[0034] Following step S12, in step S13, regarding the input using the grading heating device, the control device 500 inputs the waste plastic that has undergone drying in step S12 into the grading heating device 200. The grading heating device 200 may include a moving module for receiving waste plastic and moving it from one side to the other, a heating module for melting the moving waste plastic into a liquid state after being heated, and a discharge module for discharging the molten liquid waste plastic. In step S13, the input via the grading heating device, the waste plastic provided by the control device 500 can be conveyed via a hopper connected to the moving module.

[0035] Following step S13, step S14, which involves temperature control via the tubular electric heater 210, is executed by the heating module of the graded heating device 200, which heats the moving waste plastic to melt it into a liquid state upon heating. The heating module includes: a metal tubular cylinder horizontally connected adjacent to each other, forming interconnected first and second spaces; a hopper connected to the moving module and integrally formed on the upper part of the cylinder inlet side for feeding waste plastic into the cylinder from the outside; and a rotatably axially coupled to the first space within the cylinder, receiving drive from a motor via a power transmission device. The cylinder comprises a first rotating screw that, during one rotation, applies a moving force toward the outlet side to the waste plastic fed into the cylinder through the hopper; a second rotating screw that is rotatably axially coupled to a second space within the cylinder, receives the rotational force of the first rotating screw via a rotational force transmission device, and, during a second rotation, applies a moving force toward the outlet side to the waste plastic together with the first rotating screw; and a tubular electric heater 210 disposed outside the cylinder to heat the cylinder, causing the waste plastic, which moves from the inlet side to the outlet side under the rotational action of the first and second rotating screws, to melt into a liquid state inside the cylinder.

[0036] On the other hand, such as Figure 3 As shown, the tubular electric heater 210 is installed inside or outside each of the divided cylinder regions by the heat insulation section 220, allowing for step-by-step temperature control of each independent region under the control of the control device 500. Cooling water pipes (not shown) can be installed step-by-step as needed and adjusted by the control device to reduce the temperature. Alternatively, this tubular electric heater 210 can be designed to connect to the aforementioned discharge module for discharging molten liquid waste plastic.

[0037] At this time, the discharge module is integrally formed on the lower part of the cylinder outlet side, and as the first and second rotating screws rotate, it discharges the liquid waste plastic liquid to the discharge port outside the cylinder. The cylinder is set at a certain height interval from the ground through the base 230. Figure 3 As shown, the base 230 can be made of metal plate, but it can also be replaced with other heat insulation materials.

[0038] Therefore, when the operator starts the molding system using waste plastic pipes, the first rotating screw, which is rotatably mounted in the first space of the cylinder via a power transmission device, receives the driving force of a motor (not shown) and rotates in a first direction (e.g., counterclockwise). At the same time, the second rotating screw receives the rotational force of the first rotating screw via another power transmission device and rotates in a second direction (e.g., clockwise) as shown in the figure. Meanwhile, the control device 500 can start the tubular electric heater 210 installed outside the cylinder by control, thereby realizing the step-by-step heating control of the cylinder.

[0039] At this time, the tubular electric heater 210, which is formed by multiple partitions, can be started at the first temperature under the control of the control device 500 to prevent foreign objects in the waste plastic rod from melting in, and receives the nth temperature in step n (n is a natural number of 2 or more).

[0040] In a specific embodiment, the initial temperature of the first tubular electric heater 210 is 130°C, the second tubular electric heater 210 is 170°C, the third tubular electric heater 210 is 200°C, the fourth tubular electric heater 210 is 170°C, and the fifth tubular electric heater 210 is 260°C. The temperature of the sixth tubular electric heater 210 can be adjusted to 130°C by the controller 500.

[0041] Specifically, taking waste plastic as an example, when it liquefies at 260°C and transforms into a gel state, the control device 500 will control the temperature of the sixth tubular electric heater 210 at 130°C. This is because it is necessary to maintain the liquefied waste plastic liquid in a gel state. For the types of fusible waste plastics corresponding to steps of 130℃, 170℃, 200℃, and 260℃, the control device 500 implements step-by-step temperature increase control for each tubular electric heater 210 at different temperatures. The third tubular electric heater 210 operates at 200℃, the fourth tubular electric heater 210 drops to 170℃, and the fifth tubular electric heater 210 finally rises to 260℃, undergoing a cooling process before the final step temperature. This aims not only to eliminate the side effect of unmelted impurities remaining due to continuous heating, making it difficult to maintain a crystalline state, but also to ensure that the molten plastic in each step does not completely liquefy at once, thus maintaining a crystalline state in localized areas. That is, above 260℃, some plastic will vaporize; therefore, by forming a shorter 170℃ step with a pre-set time, [further steps are taken]. By leaving the waste plastic in a slightly incompletely melted state, it is embedded in the gaps inside the final retaining wall blocks to further enhance the crystallization process that allows the materials to hold together.

[0042] Furthermore, the steps of cleaning and screening waste plastics are omitted during the melting process. By setting temperature differences in stages, foreign objects such as fibers and metals are melted together with the waste plastic liquid. They are used together with the waste plastic liquid and formed as a component of the retaining wall blocks. When the plastic is completely melted and becomes pure, it will eventually form PET bottles or plastic bottles. These foreign objects are formed into retaining wall blocks in an interlocking form, which can effectively save the time and labor costs required for cleaning and screening steps.

[0043] After step S14, when entering the injection step S15 of the sequential extrusion device 300, after liquefaction is completed step by step in step S14, the control device 500 can provide waste plastic liquid to the sequential extrusion device 300 through the discharge module, and shape it into retaining wall blocks by extrusion.

[0044] After step S15, for the cooling process step S16 using the guide pipe, if extrusion molding is performed in a liquid state, it is easy to cause product shape deformation. Therefore, the control device 500 will transport the liquid plastic through the discharge module to the molding die of the sequential extrusion device 300 for manufacturing retaining wall blocks. The extruded waste plastic liquid is injected into each molding die and moved by the moving module formed on the sequential extrusion device 300 which rotates along a vertical or horizontal annular structure.

[0045] At this time, the moving module of the sequential extrusion device 300 in the forward area is provided with a guide pipe 400 that closely cooperates with the moving module of the forming die. The cooling control function of the control device 500 can be realized through the guide pipe 400.

[0046] After step S16, during step S17, which involves demolding at a preset time, a guide pipe 400 is formed on the moving module of the sequential extrusion device 300 in the area advanced by step S16. This guide pipe 400 closely cooperates with the moving module of the forming mold. After cooling is achieved through the guide pipe 400, if the number of steps advanced by the moving module of the sequential extrusion device 300 reaches m (m is a natural number greater than 2), the retaining wall block is demolded in the forming mold at a preset step mL (L is a natural number less than m and greater than 1) according to the control of the control device 500. Although the material shrinks after the actual temperature reduction, facilitating demolding, it is recommended to configure a dedicated external force supply device (not shown) to ensure a smooth demolding process. The demolded retaining wall block is as follows: Figure 4 As shown.

[0047] Subsequently, the control device 500 can reposition the molded mold that has completed demolding along the annular path of the moving module to the position of the molded mold of the retaining wall block of the sequential extrusion device 300 through the discharge module of the initial liquid plastic liquid. The moving module can be a moving device including components such as a conveyor belt.

[0048] Specifically, when there are ten forming molds moving with the moving module of the sequential extrusion device 300, a guide tube 400 is formed around them. When the mold moves to the 9th position, the control device 500 will start the demolding procedure to completely demold the mold. The mold will automatically rotate, thereby realizing a continuous production process.

[0049] Subsequently, after step S17, during step S18 of re-feeding into the demolding area, the control device 500 supplies waste plastic liquid to the sequential extrusion device 300 equipped with a demolding mold through the discharge module, and extrudes it into retaining wall blocks.

[0050] After step S18, in step S19 to determine whether the preset quantity has been reached, the control device 500 compares the number of retaining wall blocks counted during the re-injection process in step S18 with the preset molding quantity. If the two are consistent, the subsequent sequential extrusion device injection process S15 and the next re-injection process S18 will not be continued. Instead, the molding step of the retaining wall block in the molding mold in the current moving module will be completed directly and the fixing will be stopped. When it is found that the number of counted retaining wall blocks is insufficient by comparing with the preset molding number, at least one of step S15 and re-injection step S18 in the demolding area can be selected to be executed until the additional retaining wall block molding quantity reaches the preset standard.

[0051] This process not only improves the baseline value of the tensile strength of retaining wall blocks by removing foreign matter composed of impurities, but also... Figure 4 The waste plastic retaining wall blocks shown can be applied in multiple places by using concrete or gravel inside. During the molding process, the temperature can be controlled below a preset value for melting and then re-solidification, thereby avoiding the generation of carcinogenic substances during the secondary firing process.

[0052] This invention can also be implemented in the form of computer-readable code via a computer-readable recording medium. A computer-readable recording medium refers to all types of recording devices capable of storing data readable by a computer system.

[0053] Computer-readable recording media include storage devices such as ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical disk, as well as storage methods implemented in the form of carrier waves (such as transmission via the Internet).

[0054] Furthermore, computer-readable recording media are distributed and stored in network-connected computer systems, enabling the storage and execution of readable code in a distributed manner. The functional programs, code, and code snippets designed to implement this invention can be easily derived by programmers skilled in the art to which this invention pertains.

[0055] This invention relates to a waste plastic recycled retaining wall block molding system and a waste plastic recycled retaining wall block molding process, which can save time and manpower for cleaning and screening foreign matter and impurities mixed in waste plastic, and can improve the tensile strength of retaining wall blocks by removing foreign matter.

[0056] Furthermore, by filling the retaining wall blocks with concrete or crushed stone, the present invention can improve both the load-bearing capacity and tensile strength, thereby achieving a multi-functional application.

[0057] Furthermore, by setting the temperature during the molding process to a lower than a preset value, and by melting and then solidifying, the present invention can effectively suppress the harmful gases that are inevitably generated during the sintering process, thereby achieving an environmental protection effect.

[0058] In summary, this specification and accompanying drawings have described preferred embodiments of the present invention. Although specific terminology has been used, these terms are only for the purpose of illustrating the technical content of the invention and aiding in understanding the invention, and are not intended to limit the scope of the invention. Other embodiments based on the inventive concept are also possible in addition to those disclosed herein, which will be apparent to those skilled in the art.

Claims

1. A process for forming retaining wall blocks from recycled waste plastic, characterized in that, include: In the first step, the control device (500) feeds the waste plastic into the temperature-differentiated grading heating device (200). as well as In the second step, the control device (500) is used to adjust the temperature of each tubular electric heater (210), so that the waste plastic that moves to the multiple tubular electric heaters (210) formed in the graded heating device (200) is heated and melted into a liquid state under the action of heat.

2. The molding process for recycled waste plastic retaining wall blocks according to claim 1, characterized in that, Also includes: In the third step, after completing the second step above, the control device (500) delivers waste plastic liquid to the sequential extrusion device (300) through the discharge module, and the waste plastic liquid is formed into retaining wall blocks through the extrusion process.

3. The molding process for recycled waste plastic retaining wall blocks according to claim 2, characterized in that, Also includes: In the third step, after completing the above third step, the control device (500) injects the liquefied plastic liquid into the molding die of the sequential extrusion device (300) for forming retaining wall blocks through the discharge module. While the waste plastic liquid is being extruded into each molding die, it is moved by the moving module formed on the sequential extrusion device (300) which rotates along a vertical or horizontal annular structure.

4. The molding process for recycled waste plastic retaining wall blocks according to claim 3, characterized in that, Also includes: In the fourth step, after completing the third step above, when the mold is cooled by the tightly fitted guide tube (400), the control device (500) performs a demolding operation on the retaining wall block in the mold that has been cooled.

5. A waste plastic recycled retaining wall block molding system, characterized in that, include: A graded heating device (200) is used to liquefy waste plastics; as well as The control device (500) is used to adjust the temperature of each tubular electric heater (210) so that the waste plastic melts into a liquid state after being heated when it moves through the multiple tubular electric heaters (210) in the graded heating device (200).

6. The waste plastic recycled retaining wall block molding system according to claim 5, characterized in that, It also includes a sequential extrusion device (300), and a control device (500) supplies waste plastic liquid to the sequential extrusion device (300) through a discharge module, which is then processed into retaining wall blocks through an extrusion molding process.

7. A type of recycled waste plastic retaining wall block, wherein, The waste plastic molded part formed by the waste plastic recycled retaining wall block molding process according to claims 1 to 4 and the internal filling concrete structure or crushed stone increase the weight or tensile strength.

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