Melt filtration apparatus and method of use

Abstract

This invention relates to a melt filtering device and method. The device includes a front pressure cover, a rear pressure cover, a main gear, a first drive assembly, a transmission assembly, and a second drive assembly. The front and rear pressure covers have receiving grooves for accommodating the main gear. The front pressure cover has a melt inlet communicating with the receiving grooves, and the rear pressure cover has a melt outlet communicating with the melt inlet. The front surface of the main gear has a mounting groove for accommodating a filter screen, and the rear surface of the main gear has a through hole corresponding to the mounting groove. A slot is formed in the receiving groove. The main gear is connected to the transmission assembly, and the first drive assembly is connected to the transmission assembly. The first drive assembly drives the main gear to rotate through the transmission assembly. The drive rod of the second drive assembly can move horizontally, with one end of the drive rod located in the slot. The device provided by this invention can backwash the filter screen on the main gear, washing away impurities on the filter screen surface in the opposite direction, eliminating the need for manual removal of the filter screen and improving work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of melt filtration, specifically relating to a melt filtration device and its usage method. Background Technology

[0002] The filtration equipment used in polyester melt production is a traditional candle filter. The filter cartridge filters the high-temperature melt. When carbon deposits or impurities clog the filter element and cannot be automatically cleaned, the filter cartridge needs to be manually removed, cleaned externally, and then reinstalled. This process is costly and time-consuming. The filter cartridges are expensive and require frequent replacement, leading to high production costs. Changing the filter cartridges interrupts other processes and causes production stoppages. Furthermore, the high temperature during filter cartridge replacement poses a risk of burns to personnel. Summary of the Invention

[0003] The purpose of this invention is to provide an improved melt filtration device and its method of use.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A melt filtering device includes a front pressure cover, a rear pressure cover, a main gear, a first drive assembly, a transmission assembly, and a second drive assembly. The front pressure cover and the rear pressure cover are disposed opposite to and connected to each other. The front pressure cover and the rear pressure cover have receiving grooves for accommodating the main gear. The front pressure cover has a melt inlet communicating with the receiving grooves, and the rear pressure cover has a melt outlet communicating with the melt inlet. The front surface of the main gear has a mounting groove for accommodating a filter screen, and the rear surface of the main gear has a through hole corresponding to the mounting groove and communicating with it.

[0006] The receiving groove of the rear pressure cover has a slot on the bottom wall facing the front pressure cover. The slot is recessed away from the front pressure cover and communicates with the melt outlet.

[0007] The main gear is connected to the transmission assembly, and the first drive assembly is connected to the transmission assembly. The first drive assembly drives the main gear to rotate through the transmission assembly.

[0008] The drive rod of the second drive assembly is movable in the horizontal direction, and one end of the drive rod is located in the slot.

[0009] The device has a filtering state and a rinsing state. When in the filtering state, the mounting groove of the main gear is located between and intersects the melt inlet and melt outlet. When in the rinsing state, the mounting groove is away from the melt inlet and melt outlet, and the through hole corresponding to the mounting groove is connected to the slot. Under the movement of the drive rod, the melt flows sequentially from the slot and through hole to the filter screen in the mounting groove.

[0010] In some embodiments, the slotting includes a first slot and a second slot, both of which are recessed away from the front pressure cap. One end of the first slot communicates with the melt outlet, and the other end communicates with the second slot. The second slot extends horizontally, and one end of the drive rod is located in the second slot. When in the flushing state, the through hole corresponding to the mounting slot of the main gear communicates with the second slot.

[0011] In some embodiments, a groove is provided on the drive rod located in the slot, recessed towards its center, the groove is arranged around the outer periphery of the drive rod, and a sealing ring is provided in the groove.

[0012] In some embodiments, the transmission assembly includes a connecting rod and a rotating shaft, on which a driven gear and a roller backstop are mounted. The driven gear meshes with the main gear, and the connecting rod is connected to the roller backstop and the first drive assembly.

[0013] In some embodiments, the device further includes a connector, the first drive assembly includes a first drive body and a drive shaft, the drive shaft of the first drive assembly extends vertically, one end of the connecting rod is rotatably connected to the drive shaft, the other end of the connecting rod is connected to the roller backstop, the connector is disposed on the outside of the rear pressure cover, and the first drive body is rotatably connected to the connector.

[0014] In some embodiments, the connecting rod includes a connecting shaft, a first rod, and a second rod. The second rod includes a first segment and a second segment connected together, with an obtuse angle between the first segment and the second segment. The connecting shaft is connected to and perpendicular to the drive shaft. One end of the first rod is rotatably connected to the connecting shaft, and the other end of the first rod is connected to the first segment. The second segment is connected to the roller backstop.

[0015] In some embodiments, the front pressure cover is provided with an impurity discharge hole, which is in communication with the receiving tank. When in the flushing state, the melt discharged from the through hole and the mounting tank is discharged from the impurity discharge hole.

[0016] In some embodiments, the front pressure cover is further provided with an opening that communicates with the receiving groove, and at least part of the mounting groove of the main gear can be exposed from the opening; the device also includes a cover door located at the opening of the front pressure cover, the cover door having an open state and a closed state, when in the open state the opening is exposed; when in the closed state the cover door covers the opening.

[0017] Alternatively, the main gear may have multiple mounting slots, which are arranged circumferentially around the center of the main gear on the front surface of the main gear.

[0018] In some embodiments, the device further includes a heat dissipation cavity connected to the rear pressure cover. The second drive assembly includes a second drive body and a drive rod. The second drive body is disposed outside the heat dissipation cavity. One end of the drive rod of the second drive assembly is located inside the heat dissipation cavity. Heat dissipation holes are provided on the outer periphery of the heat dissipation cavity and are in communication with the atmosphere.

[0019] Another technical solution adopted in this invention is:

[0020] A method of using the aforementioned melt filtering device includes the following steps:

[0021] When the device is in the filtering state, the melt enters the filter screen in the mounting groove on the main gear through the melt inlet to filter melt impurities; then the main gear rotates until the device is in the flushing state, the second drive component works, and under the movement of the drive rod, a small amount of melt after filtration flows sequentially from the slot and through hole to the corresponding filter screen at the melt outlet.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0023] The melt filtering device provided by this invention, by setting a front pressure cover, a rear pressure cover, a main gear, a first drive assembly, a transmission assembly, and a second drive assembly, allows impurities in the melt to be filtered by a filter screen, and then the impurities remaining on the filter screen are backwashed to wash the impurities off the surface of the filter screen in the opposite direction. Since the main gear rotates continuously, the filter screen can be continuously circulated and washed, achieving the function of filter screen cleaning-free, extending the service life of the filter screen, reducing the frequency of filter screen replacement, greatly improving work efficiency, and reducing production costs. The installation and replacement of the filter screen is safe and reliable. Attached Figure Description

[0024] Appendix Figure 1 This is a structural diagram of the melt filtering device of the present invention from a first perspective.

[0025] Appendix Figure 2This is a structural diagram of the melt filtering device of the present invention from a second perspective.

[0026] Appendix Figure 3 This is a structural diagram of the melt filtering device of the present invention from a third perspective;

[0027] Appendix Figure 4 This is a fourth-view structural diagram (without a cover) of the melt filtering device of the present invention;

[0028] Appendix Figure 5 This is a structural diagram of the rear pressure cap of the melt filtering device of the present invention from a first perspective.

[0029] Appendix Figure 6 This is a structural diagram of the rear pressure cap of the melt filtering device of the present invention from a second perspective.

[0030] Appendix Figure 7 This is a third-view structural diagram of the rear pressure cap of the melt filtering device of the present invention;

[0031] Appendix Figure 8 for Figure 7 An enlarged view of the receiving tank;

[0032] Appendix Figure 9 This is a structural diagram of the front pressure cover of the melt filtering device of the present invention;

[0033] Appendix Figure 10 This is a structural diagram of the second drive assembly of the melt filtering device of the present invention;

[0034] Appendix Figure 11 This is a structural diagram showing the meshing of the main gear and driven gear in the melt filtering device of the present invention;

[0035] Appendix Figure 12 This is a structural diagram of the main gear of the melt filtering device of the present invention from a first-view perspective;

[0036] Appendix Figure 13 This is a structural diagram of the main gear of the melt filtering device of the present invention from a second perspective.

[0037] Appendix Figure 14 This is a perspective view of the roller backstop of the melt filtering device of the present invention;

[0038] Appendix Figure 15 This is a cross-sectional view of the roller backstop of the melt filtering device of the present invention.

[0039] In the attached diagrams above:

[0040] 1-Front pressure cap, 101-Mel inlet, 102-Impurity discharge hole, 103-Opening;

[0041] 2-Rear pressure cap, 201-Mel outlet, 202-Receiving tank, 203-First slot, 204-Second slot, 2041-Bottom wall of the second slot;

[0042] 3-Main gear, 301-Through hole, 302-Mounting slot;

[0043] 4-Driven gear; 5-Roller backstop; 51-Outer ring; 52-Star wheel; 53-Roller; 54-Rotor block; 6-Shaft;

[0044] 7-First drive assembly, 701-First drive body, 702-Drive shaft;

[0045] 8-Second drive assembly, 801-Second drive body, 802-Drive rod, 8021-Groove;

[0046] 9-Connecting rod, 901-Connecting shaft, 902-First rod, 903-First segment, 904-Second segment;

[0047] 11-Fasteners; 12-Cover; 13-Connecting support; 14-Fixed shaft; 15-Heat dissipation cavity. Detailed Implementation

[0048] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0049] See Figures 1 to 15 The melt filtering device shown includes a rear pressure cover 2, a front pressure cover 1, a main gear 3, a first drive assembly 7, a transmission assembly, and a second drive assembly 8, wherein:

[0050] The front cover 1 and the rear cover 2 are arranged opposite to each other and connected. A receiving groove for accommodating the main gear 3 is provided between the front cover 1 and the rear cover 2. That is, the receiving groove is opened on the side of the front cover 1 facing the rear cover 2, and the receiving groove is opened on the side of the rear cover 2 facing the front cover 1. These two receiving grooves are opposite to each other. The receiving groove on the front cover 1 is recessed away from the rear cover 2, and the opening of the receiving groove faces the rear cover 2. The receiving groove 202 on the rear cover 2 is recessed away from the front cover 1, and the opening of the receiving groove 202 faces the front cover 1. The receiving groove has a circular cross-section and has a bottom wall and an annular side wall connected to the bottom wall. The surface where the bottom wall of the receiving groove is located is a vertical surface.

[0051] The front pressure cover 1 has a melt inlet 101, which is connected to the receiving tank and extends to both the front and rear sides of the front pressure cover 1. The rear pressure cover 2 has a melt outlet 201, which extends to both the front and rear sides of the rear pressure cover 2. The melt inlet 101 and the melt outlet 201 are directly opposite to each other and are connected. The center line of the melt inlet 101 and the center line of the front pressure cover 1 can be in a straight line.

[0052] See Figure 5-8 The receiving groove 202 on the rear pressure cover 2 has a first groove 203 and a second groove 204 on the bottom wall facing the front pressure cover 1. Both the first groove 203 and the second groove 204 are recessed away from the front pressure cover 1. One end of the first groove 203 is connected to the melt outlet 201, and the other end is connected to the second groove 204. The first groove 203 can be inclined. The second groove 204 extends in the horizontal direction. The second groove 204 is located below the first groove 203 and also below the melt outlet 201. The second groove 204 has a bottom wall, which is a vertical surface.

[0053] See Figure 11-13 The main gear 3 has a front surface, a rear surface, and an annular circumferential surface. The front surface and the rear surface are opposite each other and are both circular planes. The annular circumferential surface is located between the front surface and the rear surface and connects the front surface and the rear surface. Multiple teeth are provided on the outer periphery of the annular circumferential surface. The front surface of the main gear 3 has a mounting groove 302 that is recessed towards its rear surface. The mounting groove 302 is used to accommodate the filter screen. The rear surface of the main gear 3 has a through hole 301 that communicates with the mounting groove 302. The through hole 301 communicates with the mounting groove 302 and with the mesh of the filter screen. That is, one end of the through hole 301 is located on the rear surface of the main gear 3, and the other end of the through hole 301 is located on the bottom wall of the mounting groove 302 of the main gear 3. During filtration, the mounting groove 302 of the main gear 3 and the through hole 301 corresponding to the mounting groove 302 are located between the melt inlet 101 and the melt outlet 201 and are interconnected. After the melt enters from the melt inlet 101, it can rush towards the filter screen and then flow through the through hole 301 and out of the melt outlet 201. Impurities on the melt can be left on the filter screen.

[0054] In some embodiments, the front cover 1 and the rear cover 2 can be fastened together by fasteners 11, such as M60 bolts. Since M60 bolts are large, they are installed using locking sleeves to ensure that the front cover 1 and the rear cover 2 are in a tight state. The front cover 1, the rear cover 2 and the main gear 3 are all provided with interconnected central holes. A fastener 11 passes through the rear cover 2, the main gear 3 and the front cover 1 in sequence, and the main gear 3 can rotate relative to the fastener 11.

[0055] In this example, the main gear 3 is connected to the transmission assembly, and the first drive assembly 7 is connected to the transmission assembly. The first drive assembly 7 drives the main gear 3 to rotate around its own axis through the transmission assembly.

[0056] The first drive assembly 7 includes a first drive body 701 and a drive shaft 702. The drive shaft 702 extends in a vertical direction. One end of the connecting rod 9 is rotatably connected to the drive shaft 702, and the other end of the connecting rod 9 is connected to the rotating shaft 6.

[0057] The second drive assembly 8 includes a second drive body 801 and a drive rod 802. The second drive body 801 is connected to one end of the drive rod 802 for driving the drive rod 802 to move in the horizontal direction. The other end of the drive rod 802 is located in the second slot 204. The second drive body 801 is located outside the rear cover 2. The other end of the drive rod 802 extends from the through slot on the rear cover 2 into the second slot 204 (the rear cover 2 is also provided with a through slot, which extends in the horizontal direction and communicates with the second slot 204. One end of the through slot is located at the left or right port of the rear cover 2).

[0058] The device has a filtering state and a rinsing state. In the filtering state, the mounting groove 302 of the main gear 3 is located between and communicates with the melt inlet 101 and the melt outlet 201. At this time, the second drive assembly 8 is not working, and the other end of the drive rod 802 maintains a distance 'a' between it and the bottom wall 2041 of the second slot 204. In the rinsing state, the main gear 3 rotates, and the mounting groove moves away from the melt inlet 101 and the melt outlet 201 until the through hole 301 corresponding to the mounting groove 302 is aligned with the second slot 204. The drive rod 802 then moves horizontally. A small amount of molten material after filtration flows from the first slot 203 to the second slot 204 through the melt outlet 201. The drive rod 802 moves along the second slot 204 to squeeze the molten material located in the second slot 204, causing the molten material to flow back to the filter screen through the through hole 301. At this time, the filter screen can be backwashed to wash away impurities or carbides on the surface of the filter screen in the opposite direction. Since the main gear 3 rotates continuously, the filter screen can be continuously circulated and washed, achieving the function of filter screen cleaning-free. There is no need for manual removal of the filter screen, which greatly improves work efficiency.

[0059] In one implementation, see Figure 1-5 The transmission assembly includes a connecting rod 9 and a rotating shaft 6. A driven gear 4 and a roller backstop 5 are mounted on the rotating shaft 6. The driven gear 4 meshes with the teeth of the main gear 3. The connecting rod 9 is connected to the rotating shaft 6 and the first drive assembly 7. Through-hole mounting holes are provided on the front and rear pressure rods, and the rotating shaft 6 is mounted within these holes.

[0060] The connecting rod 9 includes a connecting shaft 901, a first rod 902, and a second rod. The connecting shaft 901 is connected to and perpendicular to the drive shaft 702. The second rod includes a first segment 903 and a second segment 904 connected to each other. The first segment 903 and the second segment 904 form an obtuse angle. One end of the first rod 902 is rotatably connected to the connecting shaft 901, and the other end of the first rod 902 is connected to the first segment 903. The second segment 904 is connected to the roller backstop 5 (by bolts). The roller backstop 5 is connected to the rotating shaft 6 (e.g., by a key).

[0061] When the drive shaft 702 moves upward by a maximum stroke, the connecting rod 9 drives the roller backstop 5 to rotate, which in turn drives the rotating shaft 6 to rotate, and then drives the driven gear 4 to rotate by a certain angle. When the driven gear 4 rotates, it can drive the main gear 3 to rotate by a certain angle. Next, the drive shaft 702 moves down to the initial position. At this time, the roller backstop 5 rotates, but the rotating shaft 6 and the driven gear 4 do not rotate. Then the drive shaft 702 repeats the upward and downward process, and the driven gear 4 continues to rotate by a certain angle in the same direction (such as clockwise). The rotation of the driven gear 4 drives the main gear 3 to rotate by a certain angle. This cycle of operation can ensure that the driving wheel keeps rotating.

[0062] See Figure 14-15 The structure of the roller backstop 5 is as follows:

[0063] The roller backstop 5 includes an outer ring 51, a star wheel 52, rollers 53, and a rotating block 54. A spring plate or spring is located between the rollers 53 and the rotating block 54. The star wheel 52 is the driving wheel and is connected to the rotating shaft 6. When the star wheel 52 rotates clockwise, the rollers 53 are compressed by the friction force, causing the spring to compress and rotate with the star wheel 52. This is the normal working state, and the inner ring of the backstop rotates freely. When the star wheel 52 rotates counterclockwise, the rollers 53 move towards the contracted part of the gap under the action of the spring force and friction force, wedging tightly between the star wheel 52 and the outer ring 51, thus producing a backstop effect.

[0064] The device also includes a connector disposed on the outside of the rear pressure cover 2, and the first drive body 701 of the first drive assembly 7 is rotatably connected to the connector. See also Figure 5 The connector includes a connecting support 13 and a fixed shaft 14. The connecting support 13 is located on the outside of the rear pressure cover 2. The connecting support 13 is U-shaped, that is, a groove that runs through the vertical direction is opened on the connecting support 13. The fixed shaft 14 passes through the groove. A connecting plate is provided at the end of the first drive body 701 away from the drive shaft 702. A through hole is opened on the connecting plate for the fixed shaft 14 to pass through, so as to realize the rotational connection between the first drive body 701 of the first drive assembly 7 and the connector.

[0065] In some embodiments, after the drive shaft 702 of the first drive assembly 7 has made an upward stroke, the rotation angle of the main gear 3 is in the range of 10-40°, which is set according to the number of mounting slots 302 and the stroke of the drive shaft 702.

[0066] In this example, multiple mounting slots 302 are provided for the main gear 3. These mounting slots 302 are all located on the front surface of the main gear 3 and are arranged circumferentially around the center of the main gear 3. A filter screen is installed in each mounting slot 302. (See [reference]). Figure 6The device is equipped with eleven mounting slots 302. When in the filtering state, the filter screen of one mounting slot 302 is located between the melt inlet 101 and the melt outlet 201 (the mounting slot 302 and the corresponding through hole 301 are connected to the melt inlet 101 and the melt outlet 201). The melt entering from the melt inlet 101 will flow to the filter screen. As the main gear 3 rotates, the filter screen of each mounting slot 302 has the opportunity to be located between the melt inlet 101 and the melt outlet 201, so that the melt passes through each filter screen.

[0067] In some embodiments, a recessed groove 8021 is formed on the outer side of the drive rod 802 located in the second slot 204, extending towards its center. The groove 8021 surrounds the outer periphery of the drive rod 802, and preferably is located near the end of the drive rod 802 furthest from the drive body. A sealing ring is disposed within the groove 8021. The groove 8021 intercepts the molten material, preventing it from flowing outward along the outer periphery of the drive rod 802, and the sealing ring enhances the sealing performance.

[0068] In one embodiment, the front pressure cap 1 has an impurity discharge hole 102, which communicates with the receiving groove. One end of the impurity discharge hole 102 is located on the annular sidewall of the receiving groove of the front pressure cap 1, and the other end is located on the lower side of the front pressure cap 1. When in the flushing state, the melt discharged from the through hole 301 can be discharged through the impurity discharge hole 102 to the lower part of the front pressure cap 1. A waste collection groove can be provided below the impurity discharge hole 102 to collect the impurities discharged from the impurity discharge hole 102.

[0069] In this example, the front cover 1 is also provided with an opening 103, which communicates with the receiving groove. At least part of the mounting groove 302 of the main gear 3 can be exposed through the opening 103, facilitating the replacement of the filter screen. The device also includes a cover 12, which is located at the opening 103. The cover 12 has an open state and a closed state. When it is in the open state, the opening 103 is exposed, facilitating the replacement of the filter screen; when it is in the closed state, the cover 12 covers the opening 103 to prevent the filter screen from being exposed.

[0070] In some embodiments, the device further includes a heat dissipation cavity 15, which is connected to the rear pressure cover 2. The second drive body 801 of the second drive assembly 8 is disposed outside the heat dissipation cavity 15, and the drive rod 802 is located inside the heat dissipation cavity 15. The cavity of the heat dissipation cavity 15 communicates with the through slot and the second slot 204 of the rear pressure cover 2. Heat dissipation holes are provided on the outer periphery of the heat dissipation cavity 15, which are in communication with the atmosphere. When the drive rod 802 is activated, heat dissipation can be accelerated through the heat dissipation holes, thereby extending the life of the second drive assembly 8.

[0071] In this example, the filter screen can be selected with either 20 microns or 40 microns of filtration precision, depending on product requirements. After the filter screen is placed in the receiving tank, a pressure plate (not shown in the figure) is placed on top to secure it. The first drive assembly 7 and the second drive assembly 8 can be hydraulic cylinders.

[0072] The specific implementation process of the melt filtering device in this example is as follows:

[0073] As the main gear 3 rotates slowly, when a filter screen is located between the melt inlet 101 and the melt outlet 201, the melt enters through the melt inlet 101 to rinse the filter screen. When the filter screen reaches the bottom (i.e., in the rinsing state), the second drive component 8 starts to work. The melt flowing out from the melt inlet 101, the filter screen, and the through hole corresponding to the mounting slot flows to the melt outlet 201. A small amount of melt after filtration at the melt outlet 201 flows back to the first slot 203 and the second slot 204. The drive rod 802 pushes the melt located in the second slot 204, so that the filtered melt (cleaner with no impurities) flows through the through hole 301 to the corresponding filter screen for reverse rinsing, rinsing the impurities down in the reverse direction. The impurities then enter the waste collection tank at the bottom through the impurity discharge hole 102 for continuous rinsing. The main gear 3 rotates slowly continuously to achieve continuous backwashing and achieve the function of filter screen cleaning-free operation.

[0074] In this example, when the filter screen needs to be manually replaced, the first drive assembly, transmission assembly, and second drive assembly all stop working. The cover is opened, and there is a gap between the cover and the melt inlet. Even if the melt is flowing in, it will not affect the replacement of the filter screen, and there will be no risk of high temperature burns.

[0075] In this example, the melt is heat transfer oil. Since the thickness of the front and rear pressure caps is between 160-120mm, ordinary heat transfer oil has low heat transfer efficiency. Heating rod mounting holes are set in the front and rear pressure caps, and heaters are inserted inside the heating rods. Heating is carried out by inserting electric heating rods into the front and rear pressure caps to ensure that the internal melt temperature is constant and to prevent the melt from solidifying after cooling and becoming unusable.

[0076] The advantages of the melt filtering device in this example are:

[0077] 1. Reduce the frequency of filter replacement, solve the problem of unstable production caused by pressure fluctuations during the switching process of polyester melt filter, improve production efficiency, and reduce polyester production costs; the cost of replacing the filter element of the previous polyester melt filter was about 1,000 yuan, while the price of the filter element of this application is about 10 yuan, which is low cost.

[0078] 2. Effectively reduces filter screen cleaning costs. No need to use demineralized water for cleaning, reducing the cost and labor costs associated with filter element cleaning. Previously, polyester melt filter elements were cleaned using demineralized water, resulting in high labor costs.

[0079] 3. The installation and replacement of the filter screen is safe and reliable, eliminating the risk of burns to personnel during the high-temperature disassembly of conventional polyester filter screens.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A melt filtering device, characterized in that, The device includes a front pressure cover, a rear pressure cover, a main gear, a first drive assembly, a transmission assembly, and a second drive assembly. The front pressure cover and the rear pressure cover are arranged opposite to each other and connected. The front pressure cover and the rear pressure cover have receiving grooves for accommodating the main gear. The front pressure cover has a melt inlet that communicates with the receiving grooves, and the rear pressure cover has a melt outlet that communicates with the melt inlet. The front surface of the main gear has a mounting groove for accommodating a filter screen, and the rear surface of the main gear has a through hole that communicates with the mounting groove. The receiving groove of the rear pressure cover has a slot on the bottom wall facing the front pressure cover. The slot is recessed away from the front pressure cover and communicates with the melt outlet. The main gear is connected to the transmission assembly, and the first drive assembly is connected to the transmission assembly. The first drive assembly drives the main gear to rotate through the transmission assembly. The drive rod of the second drive assembly is movable in the horizontal direction, and one end of the drive rod is located in the slot. The device has a filtering state and a rinsing state. When it is in the filtering state, the mounting groove on the main gear is located between and communicates with the melt inlet and melt outlet. When it is in the rinsing state, the mounting groove is away from the melt inlet and melt outlet, and the through hole corresponding to the mounting groove communicates with the slot. Under the movement of the drive rod, the melt flows sequentially from the slot and through hole to the filter screen in the mounting groove. The slotting includes a first slot and a second slot. Both the first slot and the second slot are recessed away from the front pressure cover. One end of the first slot is connected to the melt outlet, and the other end is connected to the second slot. The second slot extends horizontally. When in the flushing state, the mounting slot of the main gear and the corresponding through hole are connected to the second slot. The device further includes a heat dissipation cavity, which is connected to the rear cover; the rear cover is also provided with a through groove, which extends horizontally and communicates with the second groove, with one end of the through groove located at the left or right port of the rear cover. The second driving assembly includes a second driving body and a driving rod. The second driving body is disposed outside the heat dissipation cavity. One end of the driving rod of the second driving assembly is located inside the heat dissipation cavity. A heat dissipation hole is formed on the outer periphery of the heat dissipation cavity, and the heat dissipation hole is in communication with the atmosphere. The second driving body is connected to one end of the driving rod to drive the driving rod to move in the horizontal direction. The other end of the driving rod is located in the second slot. The other end of the driving rod extends into the second slot from the through slot on the rear pressure cover. The driving rod can move along the second slot to squeeze the melt located in the second slot, so that the melt flows back to the filter screen from the through hole. The transmission assembly includes a connecting rod and a rotating shaft. The rotating shaft is equipped with a driven gear and a roller backstop. The driven gear meshes with the main gear. The connecting rod is connected to the roller backstop and the first drive assembly. The device further includes a connector, the first drive assembly includes a first drive body and a drive shaft, the drive shaft extends in a vertical direction, one end of the connecting rod is rotatably connected to the drive shaft, the other end of the connecting rod is connected to the roller backstop, the connector is disposed on the outside of the rear pressure cover, and the first drive body is rotatably connected to the connector. The connecting rod includes a connecting shaft, a first rod, and a second rod. The second rod includes a first segment and a second segment connected together, with an obtuse angle between the first segment and the second segment. The connecting shaft is connected to and perpendicular to the drive shaft. One end of the first rod is rotatably connected to the connecting shaft, and the other end of the first rod is connected to the first segment. The second segment is connected to the roller backstop.

2. The melt filtering device according to claim 1, characterized in that, A groove is provided on the outside of the drive rod located in the slot, and the groove is recessed towards its center. The groove is arranged around the outer periphery of the drive rod, and a sealing ring is provided in the groove.

3. The melt filtering device according to claim 1, characterized in that, The front cover is provided with an impurity discharge hole, which is connected to the receiving tank. When in the flushing state, the melt discharged from the through hole and the mounting tank is discharged from the impurity discharge hole.

4. The melt filtering device according to claim 1, characterized in that, The front cover is also provided with an opening that communicates with the receiving groove, and at least part of the mounting groove of the main gear can be exposed from the opening; the device also includes a cover door located at the opening of the front cover, and the cover door has an open state and a closed state. When it is in the open state, the opening is exposed; when it is in the closed state, the cover door covers the opening. Alternatively, the main gear may have multiple mounting slots, which are arranged circumferentially around the center of the main gear on the front surface of the main gear.

5. A method of using the melt filtering device according to any one of claims 1-4, characterized in that, Includes the following steps: When the device is in the filtering state, the melt enters the filter screen in the mounting groove on the main gear through the melt inlet to filter melt impurities; then the main gear rotates until the device is in the flushing state, the second drive component works, and under the movement of the drive rod, a small amount of melt after filtration flows sequentially from the slot and through hole to the corresponding filter screen at the melt outlet.

Images