Method for controlling filter device for recycled resin

Abstract

Disclosed is a method for controlling a filter device for recycled resin, wherein a filter replacement cycle can be significantly reduced and the filtering and discharging processes of target recycled resin injected in a molten state can be smoothly performed even under high throughput. The present invention relates to a method for controlling a filter device for recycled resin. The filter device for recycled resin includes a body having a shaft therein and having a closed rear surface. A first scraper, a first filter plate, a first orifice plate, a second orifice plate, a second filter plate, and a second scraper are sequentially coupled to the shaft. The body has an opening / closing device, a first inlet, a second inlet, an outlet, a first waste outlet, and a second waste outlet. The rotational speed of the shaft is adjusted by a reducer. The discharge amount measured by a flow sensor disposed at the outlet is transmitted to a control unit. The control unit controls the output speed of the reducer according to changes in the discharge amount to adjust the amount of recycled resin flowing into the first inlet and the second inlet.

Description

Control method for filter device for regenerative resin

[0001] The present invention relates to a method for controlling a filter device for regenerated resin, and more particularly, to a method for controlling a filter device that replaces a screen filter conventionally used in the production of regenerated resin.

[0002] This application claims priority to and the benefit of Republic of Korea Patent Application No. 10-2024-0084023, filed June 26, 2024, which is incorporated herein by reference in its entirety.

[0003] Every year, countless plastic products are consumed, and most of them are discarded after use. Therefore, technologies to periodically collect and recycle these products are expected to play a crucial role in the circular economy system.

[0004] In order to recycle plastic products, the target recyclable material is melted at an appropriate temperature and filtered to remove foreign substances such as metal, wood, fiber, and mineral components as waste.

[0005] Conventionally, screen filters, also known as mesh filters, have been used in the filtering process for recycling plastic products. However, they have problems such as poor process efficiency due to unsatisfactory pressure characteristics required for filtering molten recycled resin and frequent replacements required due to clogging caused by the waste being filtered.

[0006] Accordingly, Korean Patent No. 10-1609482 discloses a filter net automatic die that can sweep out and separate foreign substances attached to a filter net by an impeller, and then continuously discharge foreign substances and liquid-state recycled plastics by separating them. However, since there is no space between the rear interior of the main body and the filter net, it is difficult to smoothly perform the filtering and discharge processes of liquid-state recycled plastics, and there is a problem that it is difficult to process a relatively large amount of recycled plastics at a high yield.

[0007] The present invention provides a method for controlling a filter device for regenerated resin, which significantly reduces the replacement cycle of the filter and enables the filtering process and discharge process of the target regenerated resin injected in a molten state to be smoothly performed even in a large throughput.

[0008] In order to solve the above problem, the present invention provides a control method for a filter device for regenerated resin, the filter device for regenerated resin comprising: a main body having a shaft provided therein and a closed rear surface; a first scraper that rotates according to the rotation of the shaft; a first filter plate having a plurality of first holes formed on an inner surface contacting the scraper and a plurality of second holes formed on an outer surface larger than the first holes; a first orifice plate having a plurality of through holes formed therein, the inner surface contacting an outer surface of the first filter plate, the first groove protruding between the plurality of through holes on the inner surface, and the second groove having a height larger than the first groove protruding between the plurality of through holes on the outer surface; a second orifice plate having a plurality of through holes formed therein, the inner surface contacting an outer surface of the first orifice plate, the second groove protruding between the plurality of through holes on the inner surface, and the first groove having a height smaller than the second groove protruding between the plurality of through holes on the outer surface; A second filter plate having a plurality of second holes formed on an inner surface contacting the second orifice plate and a plurality of first holes formed on an outer surface smaller than the second holes; a second scraper contacting the outer surface of the second filter plate and rotating in accordance with the rotation of the shaft; an opening / closing device provided on the front surface of the main body; a first inlet formed on one side of the main body and communicating with a first injection chamber between the rear surface and the first filter plate and a second inlet communicated with a second injection chamber between the opening / closing device and the second filter plate; an outlet formed on the other side of the main body and communicating with a discharge chamber between the first orifice plate and the second orifice plate; and a first waste outlet formed on a lower surface of the main body and communicating with the first injection chamber between the rear surface and the first filter plate and a second waste outlet communicated with the second injection chamber between the opening / closing device and the second filter plate.Provided is a method for controlling a filter device for regenerated resin, wherein the first scraper, the first filter plate, the first orifice plate, the second orifice plate, the second filter plate, and the second scraper are sequentially coupled to the shaft, the rotation speed of the shaft is controlled by a reducer, the discharge amount measured by a flow sensor provided at the discharge port is transmitted to a control unit, and the control unit controls the output speed of the reducer according to a change in the discharge amount to control the amount of regenerated resin flowing into the first inlet and the second inlet.;

[0009] In addition, the control unit provides a control method for a filter device for regenerative resin, characterized in that it controls the output speed of the reducer by controlling the speed of a driving unit connected to the reducer.

[0010] In addition, a method for controlling a filter device for regenerative resin is provided, characterized in that the first scraper and the second scraper are S-shaped scrapers.

[0011] In addition, a method for controlling a filter device for regenerative resin is provided, characterized in that a flow path is formed between the first hole and the second hole.

[0012] In addition, the present invention provides a control method for a filter device for regenerative resin, characterized in that the first groove has a continuous cross-section around the axis.

[0013] In addition, the second groove provides a control method for a filter device for regenerative resin, characterized in that the cross-section is interrupted around the axis.

[0014] In addition, the main body is provided with a fixed key formed on the inner surface, and the first filter plate, the first orifice plate, the second orifice plate, and the second filter plate are each provided with a fixed key groove formed therein so as to be prevented from rotating by being coupled to the corresponding fixed key. A method for controlling a filter device for regenerative resin is provided.

[0015] Also, a method for controlling a filter device for regenerative resin is provided, characterized in that it further includes a gasket ring that is axially coupled and finished between the rear surface and the first scraper; a disc spring that contacts the second scraper in the front direction; a spline lock that is gear-coupled with the shaft while contacting the disc spring to transmit torque; and a scraper nut that is nut-coupled with the spline lock; and the disc spring, the spline lock, and the scraper nut are sequentially coupled to the shaft.

[0016] In addition, a method for controlling a filter device for regenerative resin is provided, characterized in that a waste discharge assembly having a first waste discharge connection port and a second waste discharge connection port that are respectively connected to the lower portions of the first waste discharge port and the second waste discharge port is flange-joined, and the waste discharge assembly has a discharge passage having a screw connected to a driving means installed at the lower portions of the first waste discharge connection port and the second waste discharge connection port.

[0017] According to the present invention, a method for controlling a filter device for regenerated resin is provided, wherein a filter plate, an orifice plate, and a scraper, which may be formed of a metal material inside a main body, are combined, and the scraper scrapes foreign substances filtered by the filter plate and remaining on the surface and removes them through a waste discharge port, thereby significantly reducing the replacement cycle of the filter. In controlling the filter device for regenerated resin, a method for controlling the filter device for regenerated resin is provided, wherein the amount of regenerated resin introduced by a control unit is controlled based on the discharge amount measured by a flow sensor provided at the discharge port, thereby enabling the filtering process and the discharge process of the regenerated resin to be smoothly performed.

[0018] In addition, the filter plate has a plurality of first holes formed on the inner surface, a plurality of second holes larger than the first holes formed on the outer surface, the orifice plate has a second groove formed protruding between the plurality of through holes on the inner surface, and a first groove having a height smaller than the second groove formed protruding between the plurality of through holes on the outer surface, and the combination of the scraper, the filter plate, and the orifice plate is installed as two sets facing each orifice plate, so that the space in which the molten regenerated resin can temporarily stay after passing through the filter plate and after passing through the orifice plate is gradually secured, thereby providing a control method for a filter device for regenerated resin that can smoothly perform the filtering process and the discharge process of the regenerated resin injected in a molten state even in a large amount of regenerated resin processing.

[0019] Figure 1 is a schematic diagram illustrating a control method of a filter device for regenerative resin according to the present invention.

[0020] Figures 2 and 3 are a perspective view and an exploded perspective view, respectively, showing an example of a filter device for regenerative resin.

[0021] Figures 4 to 6 are drawings showing examples of a side cross-section, one side, and the other side of a main body in a filter device for regenerative resin, respectively.

[0022] Figures 7 to 9 are drawings showing examples of the plane, back, and cross-section of the first filter plate and the second filter plate in the filter device for regenerative resin, respectively.

[0023] Figures 10 and 11 are drawings showing examples of the plane and back surfaces of the first orifice plate and the second orifice plate, respectively, in a filter device for regenerative resin.

[0024] Fig. 12 is a drawing showing an example of a plane of a waste discharge assembly in a filter device for regenerative resin.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In describing the present invention, if a detailed description of related known technologies is judged to obscure the gist of the present invention, the detailed description thereof will be omitted. In the drawings, parts irrelevant to the description are omitted for the purpose of clearly explaining the present invention, and similar parts are assigned similar reference numerals throughout the specification, and the detailed configuration direction of the present invention will be described based on the drawings. In addition, throughout the specification, when a part is said to "include" a certain component, this does not mean that other components are excluded, but that other components may be further included, unless specifically stated otherwise.

[0026]

[0027] FIG. 1 is a schematic diagram illustrating a control method of a filter device for regenerated resin according to the present invention, FIG. 2 and FIG. 3 are a perspective view and an exploded perspective view, respectively, showing an example of a filter device for regenerated resin, FIG. 4 to FIG. 6 are drawings showing a side cross-section, one side, and the other side of a main body in a filter device for regenerated resin, respectively, as examples, FIG. 7 to FIG. 9 are drawings showing a plane, a back surface, and a cross-section of a first filter plate and a second filter plate in a filter device for regenerated resin, respectively, as examples, FIG. 10 and FIG. 11 are drawings showing a plane and a back surface of a first orifice plate and a second orifice plate in a filter device for regenerated resin, respectively, as examples, and FIG. 12 is a drawing showing a plane of a waste discharge assembly in a filter device for regenerated resin, respectively.

[0028] Referring to FIGS. 1 to 12, in the control method of the filter device for regenerated resin according to the present invention, the filter device for regenerated resin (100) has a main body (110) having a shaft (111) inside and a closed rear surface (101), a first scraper (120), a first filter plate (130), a first orifice plate (140), a second orifice plate (150), a second filter plate (160) and a second scraper (170) sequentially coupled to the shaft, and the main body is provided with an opening / closing device (112), a first inlet (113), a second inlet (114), an outlet (115), a first waste outlet (116) and a second waste outlet (117), and the rotation speed of the shaft (111) is controlled by a reducer (105), and the discharge amount measured by a flow sensor (1151) provided in the outlet (115) is It is transmitted to the control unit (190), and the control unit (190) controls the output speed of the reducer (105) according to the change in the discharge amount to control the amount of regenerated resin flowing into the first inlet (113) and the second inlet (114).

[0029] Depending on the state of the regenerated resin injected into the first injection port (113) and the second injection port (114), i.e., depending on the type, amount, and other properties of foreign substances other than the resin component, the filtering process and the discharge process of the regenerated resin may not be performed smoothly due to a closed hole phenomenon of the first filter plate (130) or the second filter plate (160), and in this case, the discharge amount of the filtered regenerated resin discharged into the discharge port (115) decreases. In the present invention, when the discharge amount measured by the flow sensor (1151) provided in the discharge port (115) decreases, the control unit (190) increases the output speed of the reducer (105) to upwardly adjust the amount of the regenerated resin introduced, thereby ensuring that the filtering process and the discharge process of the regenerated resin are performed smoothly.

[0030] At this time, the control unit (190) can control the output speed of the reducer (105) by controlling the speed of the drive unit (1051), for example, the drive motor, connected to the reducer (105), and when the discharge amount of the discharge port (115) decreases as described above, the control unit (190) can send a signal to increase the speed of the drive unit (1051), thereby increasing the output speed of the reducer (105).

[0031] The above flow sensor (1151) is installed at the outlet (115) and is capable of measuring the flow rate of a filtered liquid substance with a certain viscosity, and is not limited in type as long as it is a sensor that can transmit the measured flow rate data to the control unit (190). For example, an electromagnetic flow meter, a volumetric flow meter, a Coriolis flow meter, a turbine flow meter, etc. can be used.

[0032] The above-described reducer (105) is a mechanical device that lowers the rotational speed of the driving unit (1051) and increases the torque, and is connected to the shaft (111) to control the rotational speed of the shaft (111) so that the viscous regenerative resin can be pressurized and smoothly filtered, and the output speed of the reducer (105) is controlled in conjunction with the speed change of the driving unit (1051). The reducer (105) is not particularly limited, and for example, a planetary gear reducer, a worm gear reducer, a helical gear reducer, etc. can be used.

[0033] The above control unit (190) is a controller (190) that can automatically control the speed of the driving unit (1051) by receiving discharge amount measurement data from the flow sensor (1151). A typical PID (Proportional-Integral-Differential) controller or PLC (Programmable Logic Controller) controller can be used. For example, the controller (190) works in conjunction with an inverter, and when the controller (190) transmits a speed command to the inverter (or servo driver), the inverter transmits the command to the driving unit (motor) (1051) to control the speed of the driving unit (1051) by adjusting the voltage and frequency.

[0034] For example, if the discharge amount received from the flow sensor (1151) falls short of the target discharge amount when the target discharge amount has been previously input, the control unit (190) sends a speed increase signal to the drive unit (1051), and when the speed of the drive unit (1051) increases, the output speed of the reducer (105) is adjusted upward, while the amount of regenerative resin flowing into the first inlet (113) and the second inlet (114) is also adjusted upward. Thereafter, if the discharge amount received from the flow sensor (1151) reaches the target, the control unit (190) sends a speed decrease signal to the drive unit (1051), and this control process is repeated depending on whether the target discharge amount is reached.

[0035] In the present invention, the combination of the scraper (120, 170), filter plate (130, 160), and orifice plate (140, 150) is provided as two sets. That is, the first scraper (120), the first filter plate (130), and the first orifice plate (140) are provided as one set, and the second scraper (170), the second filter plate (160), and the second orifice plate (150) are provided as another set.

[0036] The first filter plate (130) is a component that allows the target regenerated resin in a molten state to be filtered from the first injection chamber (106) formed on one side of the main body (110), and has a plurality of first holes (131) formed on the inner surface that contacts the first scraper (120), and a plurality of second holes (132) larger than the first holes (131) formed on the outer surface.

[0037] The diameters of the first hole (131) and the second hole (132) can be appropriately determined depending on the state of the regenerated resin to be filtered. For example, the diameter of the first hole (131) can be 0.1 to 5 mm, and the diameter of the second hole (132) can be 10 to 50 mm. The first hole (131) and the second hole (132) can be formed entirely on the inner and outer surfaces of the first filter plate (130), respectively. Here, the terms 'inner surface' and 'outer surface' mean the surface facing the rear direction and the surface facing the front direction inside the main body (110), respectively, and are used with the same meaning hereinafter.

[0038] The second hole (132) can be connected to a plurality of the first holes (131), and the regenerated resin filtered through the first holes (131) that are not connected to the second holes (132) is discharged to the second hole (132) along the flow path (133) formed between the first hole (131) and the second hole (132). The flow path (133) and the second hole (132) provide a space in which the regenerated resin passing through the first hole (131) can temporarily stay, and the space between the first grooves (141) protrudingly formed on the inner surface of the adjacent first orifice plate (140) described later can be connected, so that the regenerated resin's staying space can be further expanded.

[0039] The shapes of the first hole (131) and the second hole (132) are not particularly limited, and may be, for example, circular or honeycomb shaped.

[0040] The first scraper (120) is installed in close contact with the inner surface of the first filter plate (130) and serves to scrape foreign substances that cannot pass through the first filter plate (130) and remain on the surface and drop them to the lower part inside the main body (110). The first scraper (130) rotates according to the rotation of the shaft (111), and the shaft (111) has its speed controlled by a reducer (105) connected to a driving unit (1051) controlled by the control unit (190), so that the rotational speed of the first scraper (120) can also be controlled.

[0041] In order to improve the foreign substance removal performance of the first scraper (120) driven in this way, its shape is preferably S-shaped as shown in the drawing, but is not limited thereto, and may be formed in the shape of two to four curved blades.

[0042] The first orifice plate (140) supports the first filter plate (130) and secures a retention space for the regenerated resin filtered by the first filter plate (130) to ensure smooth filtering of the first filter plate (130), and also secures the size of the discharge chamber (108), which is the space where the regenerated resin is retained before being discharged, to be wider than the space between the first filter plate (130) and the first orifice plate (140), so that the filtering process and the discharge process of the regenerated resin injected in a molten state can be smoothly performed even in a large amount of regenerated resin being processed.

[0043] Specifically, the first orifice plate (140) has a plurality of through holes (143) formed therein, the inner surface of which is in contact with the outer surface of the first filter plate (130), a first groove (141) is formed protrudingly between the plurality of through holes (143) on the inner surface, and a second groove (142) having a height greater than that of the first groove (141) is formed protrudingly between the plurality of through holes (143) on the outer surface.

[0044] The diameter of the above-mentioned through hole (143) may be appropriately determined depending on the state of the regenerated resin to be filtered, but may be larger than the first hole (131) and smaller than the second hole (132). For example, the diameter of the through hole (143) may be 2 to 20 mm. The through hole (143) may be formed entirely by penetrating the inner and outer surfaces of the first orifice plate (140).

[0045] The first groove (141) and the second groove (142) are respectively formed as protruding structures like partition walls on the inner and outer surfaces of the first orifice plate (140), and as described above, the first groove (141) secures a retention space for the regenerated resin filtered by the first filter plate (130), and the second groove (142) secures the size of the discharge chamber (108) to be wider than the space between the first filter plate (130) and the first orifice plate (140).

[0046] The heights of the first groove (141) and the second groove (142) can be appropriately determined depending on the state of the target regenerated resin. For example, the height of the first groove (141) can be 1 to 5 mm, and the height of the second groove (142) can be 3 to 10 mm.

[0047] At this time, it is preferable that the first groove (141) be formed so that the cross-section is continuous around the axis, so that the regenerated resin passing through the first filter plate (130) can be quickly introduced into the through hole (143) without mixing with each other as much as possible.

[0048] On the other hand, it is preferable that the second groove (142) be formed so that the cross-section is interrupted around the axis. This is to expand the space of the discharge chamber (108) through the formation of the second groove (142) while allowing the regenerated resin to be smoothly discharged through the discharge port (115).

[0049] The second filter plate (160) is a component that allows the target regenerated resin in a molten state to be filtered from the second injection chamber (107) formed on one side of the main body, and has a plurality of second holes (132) formed on the inner surface that contacts the first orifice plate (140), and a plurality of first holes (131) smaller than the second holes (132) formed on the outer surface.

[0050] The diameters of the first hole (131) and the second hole (132) can be appropriately determined depending on the state of the regenerated resin to be filtered. For example, the diameter of the first hole (131) can be 0.1 to 5 mm, and the diameter of the second hole (132) can be 10 to 50 mm. The first hole (131) and the second hole (132) can be formed entirely on the outer surface and inner surface of the second filter plate (160), respectively.

[0051] The second hole (132) may be connected to a plurality of the first holes (131), and the regenerated resin filtered through the first holes (131) that are not connected to the second holes (132) is discharged to the second hole (132) along the flow path (133) formed between the first hole (131) and the second hole (132). The flow path (133) and the second hole (132) provide a space in which the regenerated resin passing through the first hole (131) can temporarily stay, and the space between the first grooves (141) protrudingly formed on the inner surface of the adjacent second orifice plate (150) described later may be connected, so that the regenerated resin's staying space can be further expanded.

[0052] The second scraper (170) is installed in close contact with the outer surface of the second filter plate (160) and serves to scrape foreign substances that cannot pass through the second filter plate (160) and remain on the surface and drop them to the lower part inside the main body (110). The second scraper (170) rotates according to the rotation of the shaft (111), and the shaft (111) has its speed controlled by a reducer (105) connected to a driving unit (1051) controlled by the control unit (190), so that the rotational speed of the second scraper (170) can also be controlled.

[0053] In order to improve the foreign substance removal performance of the second scraper (170) driven in this way, its shape is preferably S-shaped as shown in the drawing, but is not limited thereto, and may be formed in the shape of two to four curved blades.

[0054] The second orifice plate (150) supports the second filter plate (160) and secures a retention space for the regenerated resin filtered by the second filter plate (160) to ensure smooth filtering of the second filter plate (160), and also secures the size of the discharge chamber (108), which is the space where the regenerated resin is retained before being discharged, to be wider than the space between the second filter plate (160) and the second orifice plate (150), so that the filtering process and the discharge process of the regenerated resin injected in a molten state can be smoothly performed even in a large amount of regenerated resin being processed.

[0055] Specifically, the second orifice plate (150) has a plurality of through holes (143) formed therein, and its inner surface is in contact with the outer surface of the first orifice plate (140), and a second groove (142) is formed protrudingly between the plurality of through holes (143) on the inner surface, and a first groove (141) having a height smaller than that of the second groove (142) is formed protrudingly between the plurality of through holes (143) on the outer surface.

[0056] The diameter of the above-mentioned through hole (143) may be appropriately determined depending on the state of the regenerated resin to be filtered, but may be larger than the first hole (131) and smaller than the second hole (132). For example, the diameter of the through hole (143) may be 2 to 20 mm. The through hole (143) may be formed entirely by penetrating the inner and outer surfaces of the second orifice plate (150).

[0057] The first groove (141) and the second groove (142) are respectively formed as a structure that protrudes like a partition wall on the outer surface and the inner surface of the second orifice plate (150), and as described above, a retention space for the regenerated resin filtered by the second filter plate (160) is secured by the first groove (141), and the size of the discharge chamber (108) is secured to be wider than the space between the second filter plate (160) and the second orifice plate (150) by the second groove (142), and the outer surface of the first orifice plate (140) and the inner surface of the second orifice plate (150) are installed to face each other.

[0058] The heights of the first groove (141) and the second groove (142) can be appropriately determined depending on the state of the target regenerated resin. For example, the height of the first groove (141) can be 1 to 5 mm, and the height of the second groove (142) can be 3 to 10 mm.

[0059] At this time, it is preferable that the first groove (141) be formed so that the cross-section is continuous around the axis, so that the regenerated resin passing through the second filter plate (160) can be quickly introduced into the through hole (143) without mixing with each other as much as possible.

[0060] On the other hand, it is preferable that the second groove (142) be formed so that the cross-section is interrupted around the axis. This is to expand the space of the discharge chamber (108) through the formation of the second groove (142) while allowing the regenerated resin to be smoothly discharged through the discharge port (115).

[0061] As described above, the first scraper (120) and the second scraper (170) are provided to rotate according to the rotation of the shaft (111), but the first filter plate (130), the first orifice plate (140), the second orifice plate (150), and the second filter plate (160) are provided so as not to rotate even when the shaft (111) is rotated.

[0062] To this end, the main body (110) is formed with a fixed key (118) on the inner surface (only the fixed key of the second orifice plate is shown in the drawing), and the first filter plate (130), the first orifice plate (140), the second orifice plate (150), and the second filter plate (160) are each formed with a fixed key groove (134, 141, 151, 161) so that they can be coupled to the corresponding fixed key (118) to prevent rotation.

[0063] In the present invention, in addition to one set comprising the first scraper (120), the first filter plate (130), and the first orifice plate (140) and another set comprising the second scraper (170), the second filter plate (160), and the second orifice plate (150), parts for finishing the rear (101) and front (102) of the main body may be provided.

[0064] That is, a gasket ring (1091) may be provided on the rear surface (101), and a disk spring (1092), a spline lock (1093), a scraper nut (1094), and an opening / closing device (112) may be sequentially provided on the front surface (102).

[0065] The above gasket ring (1091) can be installed on the shaft (111) of the rear surface (101) of the main body to prevent material leakage and to ensure that parts connected to the shaft are stably fastened. In addition, the disk spring (1092) is installed in close contact with the second scraper (170) to maintain the tensile force and fastening force of the parts connected to the shaft (111), the spline lock (1093) is gear-coupled with the shaft (111) while in contact with the disk spring (1092) to transmit torque, and the scraper nut (1094) is nut-coupled with the spline lock (1093) to ensure a finish. In addition, the opening / closing device (112) can be installed in a hinge-coupled manner on the front surface (102) of the main body.

[0066] The first injection port (113) and the second injection port (114) are formed on one side (103) of the main body (110) as inlets through which the molten target regenerated resin is injected. The first injection port (112) is formed to communicate with the first injection chamber (106) between the rear surface (101) and the first filter plate (130), and the second injection port (114) is formed to communicate with the second injection chamber (107) between the opening / closing device (112) and the second filter plate (160).

[0067] At this time, the first injection port (113) and the second injection port (114) may be connected by a single pipe, but of course, they may also be connected by separate pipes, and the melting and injection of the regenerated resin are performed by a separately provided heating device and driving means, and since this is a matter obvious to those skilled in the art, a detailed description thereof will be omitted.

[0068] The above discharge port (115) is formed on the other side (104) of the main body (110) as an outlet for discharging filtered regenerated resin, and is formed to communicate with the discharge chamber (108) between the first orifice plate (140) and the second orifice plate (150). As described above, the discharge port (115) is provided with a flow sensor (1151) for measuring the discharge amount, and the discharge amount measured by the flow sensor (1151) is transmitted to the control unit (190).

[0069] At this time, the above discharge port (115) may be connected to one pipe, but of course, may also be connected to each pipe, and the discharge of the regenerated resin is performed by a driving means, and as this is a matter obvious to those skilled in the art, a detailed description will be omitted.

[0070] The first waste discharge port (116) and the second waste discharge port (117) are formed on the bottom surface of the main body (110) and serve as outlets for discharging foreign substances filtered by the filter plates (130, 160), respectively. The first waste discharge port (116) is formed to communicate with the first injection chamber (106) between the rear surface (101) and the first filter plate (130), and the second waste discharge port (117) is formed to communicate with the second injection chamber (107) between the opening / closing device (112) and the second filter plate (160).

[0071] Foreign substances discharged through the first waste discharge port (116) and the second waste discharge port (117) can be discharged to the outside through the waste discharge assembly (180).

[0072] The above waste discharge assembly (180) is provided with a first waste discharge connection port (181) and a second waste discharge connection port (182) that are respectively connected to the lower portions of the first waste discharge port (116) and the second waste discharge port (117), and can be flange-joined to the lower surface of the main body (110).

[0073] At this time, a waste discharge passage (185) having a screw (184) connected to a waste discharge driving means (183) may be provided at the lower portion of the first waste discharge connection port (181) and the second waste discharge connection port (182). The foreign substances discharged through the first waste discharge port (116) and the second waste discharge port (117) inevitably include some molten regenerated resin. By the rotation of the screw (184), the solid foreign substances are pushed into the screw (184), and the fluid molten regenerated resin is pushed out and refluxes or reversely flows so as to be re-introduced into the filter plate (130, 160), thereby further improving the yield.

[0074]

[0075] Preferred embodiments of the present invention have been described in detail above with reference to the drawings. The description of the present invention is provided for illustrative purposes only, and those skilled in the art will readily appreciate that modifications to other specific forms are possible without altering the technical spirit or essential characteristics of the present invention.

[0076] Accordingly, the scope of the present invention is indicated by the claims described below rather than the description of the invention above, and all changes or modifications derived from the meaning, scope and equivalent concepts of the claims should be interpreted as being included in the scope of the present invention.

[0077]

[0078] * Explanation of symbols

[0079] 100: Filter device for regenerated resin 101: Rear

[0080] 102: Front 103: Side

[0081] 104: Other side 105: Reducer

[0082] 1051: Drive unit 106: First injection chamber

[0083] 107: Second injection chamber 108: Discharge chamber

[0084] 1091: Gasket ring 1092: Disc spring

[0085] 1093: Spline lock 1094: Scraper nut

[0086] 110: Body 111: Axis

[0087] 112: Switching device 113: First inlet

[0088] 114: Second inlet 115: Outlet

[0089] 1151: Flow sensor 116: First waste discharge outlet

[0090] 117: Second waste discharge outlet 118: Fixed key

[0091] 120: 1st scraper 130: 1st filter plate

[0092] 131: Hole 1 132: Hole 2

[0093] 133: Euro 134, 141, 151, 161: Fixed key home

[0094] 140: First orifice plate 141: First groove

[0095] 142: Second groove 143: Through hole

[0096] 150: Second orifice plate 160: Second filter plate

[0097] 170: Second scraper 180: Waste discharge assembly

[0098] 181: First waste discharge connection port 182: Second waste discharge connection port

[0099] 183: Waste discharge driving means 184: Screw

[0100] 185: Waste discharge passage 190: Control unit

Claims

1. A control method for a filter device for regenerative resin, The filter device for the above regenerated resin is, A body having an internal shaft and a closed rear end; A first scraper that rotates according to the rotation of the above axis; A first filter plate having a plurality of first holes formed on an inner surface that contacts the scraper and a plurality of second holes larger than the first holes formed on an outer surface; A first orifice plate having a plurality of through holes formed therein, an inner surface in contact with an outer surface of the first filter plate, a first groove protrudingly formed between the plurality of through holes on the inner surface, and a second groove having a height greater than the first groove protrudingly formed between the plurality of through holes on the outer surface; A second orifice plate having a plurality of through holes formed, an inner surface in contact with an outer surface of the first orifice plate, a second groove protrudingly formed between the plurality of through holes on the inner surface, and a first groove having a height smaller than the second groove protruding between the plurality of through holes on the outer surface; A second filter plate having a plurality of second holes formed on an inner surface in contact with the second orifice plate and a plurality of first holes formed on an outer surface smaller than the second holes; A second scraper that contacts the outer surface of the second filter plate and rotates according to the rotation of the shaft; An opening / closing device provided on the front of the main body; A first injection port formed on one side of the main body and communicating with a first injection chamber between the rear surface and the first filter plate, and a second injection port communicating with a second injection chamber between the opening / closing device and the second filter plate; An outlet formed on the other side of the main body and communicating with a discharge chamber between the first orifice plate and the second orifice plate; and A first waste discharge port formed on the lower surface of the main body and communicating with a first injection chamber between the rear surface and the first filter plate, and a second waste discharge port communicating with a second injection chamber between the opening / closing device and the second filter plate; Including, the first scraper, the first filter plate, the first orifice plate, the second orifice plate, the second filter plate, and the second scraper are sequentially coupled to the shaft, The above shaft has a rotation speed controlled by a reducer, The discharge amount measured by the flow sensor provided in the above discharge port is transmitted to the control unit, A control method for a filter device for regenerated resin, wherein the control unit controls the output speed of the reducer according to a change in the discharge amount to control the amount of regenerated resin flowing into the first inlet and the second inlet.

2. In paragraph 1, A control method for a filter device for regenerative resin, characterized in that the control unit controls the output speed of the reducer by controlling the speed of the driving unit connected to the reducer.

3. In paragraph 1, A control method for a filter device for regenerative resin, characterized in that the first scraper and the second scraper are S-shaped scrapers.

4. In paragraph 1, A control method for a filter device for regenerative resin, characterized in that a flow path is formed between the first hole and the second hole.

5. In paragraph 1, A control method for a filter device for regenerative resin, characterized in that the first groove has a continuous cross-section around the axis.

6. In paragraph 1, A control method for a filter device for regenerative resin, wherein the second groove has a cross-section that is interrupted around the axis.

7. In paragraph 1, A control method for a filter device for regenerative resin, characterized in that the main body has a fixed key formed on the inner surface, and the first filter plate, the first orifice plate, the second orifice plate, and the second filter plate each have a fixed key groove formed therein and are prevented from rotating by being coupled to the corresponding fixed key.

8. In paragraph 1, A gasket ring that is axially coupled and terminated between the rear surface and the first scraper; A disk spring contacting the front direction of the second scraper; A spline lock that is in contact with the above disk spring and is gear-engaged with the above shaft to transmit torque; and A scraper nut coupled with the above spline lock and nut; A control method for a filter device for regenerative resin, characterized in that the disk spring, the spline lock and the scraper nut are sequentially coupled to the shaft.

9. In paragraph 1, A waste discharge assembly having a first waste discharge connection port and a second waste discharge connection port respectively connected to the lower portion of the first waste discharge port and the second waste discharge port is flange-joined, A control method for a filter device for regenerative resin, characterized in that the waste discharge assembly is provided with a discharge passage having a screw connected to a driving means installed at the lower portion of the first waste discharge connection port and the second waste discharge connection port.

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