Automatic separation device for molten impurities of high-temperature-resistant polyester resin

Abstract

The invention provides a high-temperature-resistant polyester resin molten-state impurity automatic separation device which comprises a rack, a material tank and a transition tank, the rack is fixedly provided with a support, and the transition tank is arranged outside the material tank in a sleeving mode, fixed to the support and used for injecting molten-state polyester resin; the plurality of centrifugal tanks are circumferentially distributed on the periphery of the transition tank and are used for centrifugally precipitating metal particle impurities in the molten polyester resin to the bottom; the centrifugal driving mechanism comprises a rotating assembly installed on the rack and a plurality of radial push-pull assemblies circumferentially installed on the side wall of the transition tank. According to the separation device, metal particle impurities in molten polyester resin can be pre-separated, the burden of the filter screens can be reduced, and the filter area is increased and the mesh holes can be effectively prevented from being blocked by adopting a graded filtering mode of the conical coarse filter screen and the conical fine filter screen and a rotary centrifugal throwing mode.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester resin production, and particularly to an automatic separation device for impurities in the molten state of high-temperature resistant polyester resin. Background Art

[0002] High-temperature resistant polyester resin is a type of polymer material that can maintain mechanical properties, chemical stability, and insulation at high temperatures (usually ≥ 150°C) through molecular structure modification or addition of additives. Its characteristics include acid and alkali resistance, low shrinkage rate, anti-aging, waterproof and earthquake resistance, etc.

[0003] In the production process of polyester resin, after various ingredients are stirred and mixed in a reaction kettle to form the required polyester resin, in the later stage of polyester resin synthesis, impurities such as unreacted solid particles and catalyst residues are removed through a pressure filtration process. For example, after synthesis, the molten resin is passed through a high-precision filter screen or filter cloth, and the pressure difference is used to intercept impurities.

[0004] In the existing pressure filtration equipment, due to the extrusion form, the filter screen is prone to rupture under high pressure. Among them, the solid particles include some metal particle impurities, and direct pressure filtration will further burden the filter screen, and the pressure filtration form is also prone to cause blockage of the filter screen. Summary of the Invention

[0005] In view of the above problems, the present invention provides an automatic separation device for impurities in the molten state of high-temperature resistant polyester resin. This separation device can pre-separate metal particle impurities in the molten polyester resin, reduce the burden on the filter screen, and adopts a form of hierarchical filtration with a conical coarse filter screen and a conical fine filter screen. By using the method of rotating and centrifugally throwing out, it not only increases the filtration area but also can effectively avoid blockage of the mesh holes.

[0006] To solve the above problems, the technical solution adopted by the present invention is:

[0007] An automatic separation device for impurities in the molten state of high-temperature resistant polyester resin, including a frame, on which a bracket is fixedly installed, and further includes:

[0008] A material tank and a transition tank, the transition tank is sleeved outside the material tank and fixed on the bracket for injecting molten polyester resin;

[0009] A plurality of centrifugal tanks, circumferentially distributed around the transition tank, for centrifugally precipitating metal particle impurities in the molten polyester resin to the bottom;

[0010] A centrifugal driving mechanism, including a rotating component installed on the frame and a plurality of radial push-pull components circumferentially installed on the side wall of the transition tank, so that half of the centrifugal tanks are in a centrifugal state and the other half of the centrifugal tanks are in a separation and discharge state;

[0011] The suction mechanism is installed below the frame and is used to separate and discharge metal particle impurities and extract the remaining molten polyester resin.

[0012] The filter box is fixedly installed on the frame. Inside the filter box, a conical coarse filter screen and a conical fine filter screen are installed in a conical shape from the inside to the outside. The suction mechanism extracts the molten polyester resin into the filter box, making it flow through the conical coarse filter screen and the conical fine filter screen in sequence.

[0013] Multiple groups of inclined scrapers are installed inside the filter box. Each group of inclined scrapers respectively abuts against the conical coarse filter screen, the conical fine filter screen, and the inclined inner wall of the filter box, and are used to push the molten polyester resin to rotate to increase the contact area with the mesh surface and also used to clean the mesh surface.

[0014] Preferably, a feed pipe and a discharge pipe are respectively connected to the top and bottom of the material tank. The discharge pipe is located inside the transition tank, and an overflow port is provided on the side wall of the top of the material tank.

[0015] Preferably, a first suction pump is installed at the bottom of the transition tank. Multiple liquid inlet pipes are circumferentially connected to the discharge end of the first suction pump. A centrifugal inlet pipe and a centrifugal outlet pipe are respectively provided at the top and bottom of the centrifugal tank. The end of the liquid inlet pipe is docked with the centrifugal inlet pipe through a rotary joint, and the centrifugal outlet pipe is docked with a discharge pipe through a rotary joint.

[0016] Preferably, the rotating assembly includes a first motor installed on the frame. A large gear disc is fixed to the output end of the first motor, and a gear ring cooperating with the large gear disc is fixedly sleeved on the centrifugal tank.

[0017] Preferably, the radial push-pull assembly includes a fixed seat fixedly installed on the side wall of the transition tank. A hydraulic cylinder is radially fixedly installed on the fixed seat. A hanging plate is fixed to the telescopic end of the hydraulic cylinder. The corresponding upper rotary joint is fixedly installed on the hanging plate. Multiple radial push-pull openings are provided at the top of the frame. A support sliding seat is slidably installed in the radial push-pull opening, and the corresponding lower rotary joint is fixedly installed on the corresponding support sliding seat.

[0018] Preferably, the suction mechanism includes a second suction pump installed on the frame. Multiple suction pipes are circumferentially connected to the suction end of the second suction pump. Solenoid valves are installed in all the suction pipes. The end of the suction pipe is connected to one side of the bottom of the discharge pipe. The length of the discharge pipe from the rotary joint to the suction pipe is the metal suction section. A three-way valve is installed at the connection of the suction pipe and the discharge pipe. An annular collection pool is provided at the top of the filter box. The lower end of the discharge pipe corresponds to the annular collection pool. The discharge end of the second suction pump is docked with a transfer pipe through a rotary joint. The transfer pipe extends into the filter box and has multiple liquid outlet holes on its side wall.

[0019] Preferably, a second motor is installed on the frame. The output end of the second motor is drivingly connected to the rotating pipe through a pair of gears. Connecting arms are fixedly connected to the tops of multiple groups of the inclined scraping plates, and the ends of the connecting arms are fixedly installed on the side wall of the rotating pipe.

[0020] Preferably, a plurality of extrusion ribs are connected in series on the circumferential side walls of the conical coarse filter screen and the conical fine filter screen. The cross section of the extrusion rib is triangular, and the extrusion rib is a filter screen.

[0021] Preferably, multiple circles of discharge ports are provided at the bottom of the filter box. The multiple circles of discharge ports respectively correspond to the bottom of the conical coarse filter screen, the bottom of the extrusion ribs, the bottom of the conical fine filter screen, and the bottom outside the filter box. A collection net plate is fixedly installed at the bottom of the filter box. The discharge ports at the bottoms of the conical coarse filter screen, the extrusion ribs, and the conical fine filter screen correspond to the collection net plate. The lower end of the rotating pipe extends into the collection net plate and is fixed with a push plate. A waste discharge port is radially opened at the bottom of the collection net plate. An opening and closing assembly is installed in the waste discharge port, and a discharge channel is butted at the bottom of the waste discharge port. A liquid discharge cover is also fixed to the filter box.

[0022] Preferably, a flushing pipe is provided on the side of the inclined scraping plate that abuts against the conical fine filter screen and the inner wall of the filter box. A plurality of flushing holes are provided on the side wall of the flushing pipe. A water pipe connecting the flushing pipe and the rotating pipe is provided in the connecting arm, and a solenoid valve is installed in the water pipe.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. By installing a material tank, a transition tank, multiple centrifugal tanks, and a centrifugal driving mechanism, the molten polyester resin first enters the material tank. When the inlet speed is greater than the discharge speed, it enters the transition tank through the overflow port. Start the first suction pump, extract the polyester resin in the transition tank, and inject it into multiple transition tanks through multiple liquid inlet pipes and centrifugal inlet pipes. While achieving sub-packaging, the load is shared, meeting the centrifugal speed. Start the hydraulic cylinder, radially pull the centrifugal tank through the hanging plate, and the supporting sliding seat slides synchronously, so that the gear ring meshes with the large gear disc. Start the first motor to drive the large gear disc to rotate, and then drive multiple centrifugal tanks to rotate rapidly to separate metal particle impurities with significant density differences. After stopping the rotation, they are deposited at the bottom of the tank. Stopping the rotation only requires the separation of the gear ring and the large gear disc, reducing the subsequent filtration burden. In order to meet the process of continuous centrifugation and continuous filtration, half of the centrifugal tanks are in the centrifugal state, and the other half of the centrifugal tanks are in the separation and discharge state. The two processes are carried out synchronously, with high efficiency.

[0025] 2. By installing a suction mechanism, when it is necessary to discharge the precipitated metal particle impurities, just open the solenoid valve in the corresponding suction pipe first. Initially, the three-way valve connects the discharge pipe to the suction pipe, and the second suction pump sucks, sucking the precipitated metal particle impurities into the metal suction section of the discharge pipe. Then the three-way valve rotates to disconnect the suction pipe, and the metal particle impurities in the metal suction section can be discharged to the annular collection pool through the lower end of the discharge pipe for collection. After the metal impurities are separated, the suction pipe and the discharge pipe are connected again, and the molten polyester resin can be pumped out into the filter box to reduce the subsequent filtration burden.

[0026] 3. By installing a conical coarse filter screen, a conical fine filter screen and multiple groups of inclined scrapers, the sucked molten polyester resin enters the rotating pipe and is discharged through multiple liquid outlet holes. Start the second motor, drive the rotating pipe to rotate through a pair of gears, and evenly throw the molten polyester resin onto the surface of the conical coarse filter screen. At the same time, the rotating pipe drives multiple inclined scrapers to rotate through the connecting arm, and the inclined scrapers rotate against the mesh surface. On the one hand, it pushes the molten polyester resin to rotate, and under the action of centrifugal force, it covers the mesh surfaces of the entire conical coarse filter screen and the conical fine filter screen, increasing the filtration area and improving the filtration speed, so that the molten polyester resin passes through the conical coarse filter screen and the conical fine filter screen in sequence for grading filtration. On the other hand, it can scrape off the impurities on the mesh surface to prevent them from clogging and keep it in an efficient filtration state.

[0027] 4. By installing multiple extrusion ridges, a collection disk and multiple circles of discharge ports, during the rotation process of the molten polyester resin, it can intermittently gather in the extrusion ridges, generating an instantaneous extrusion force to increase the passing rate and further improve the filtration effect. And it can also gather the impurities in the extrusion ridges. The impurities gathered in the conical coarse filter screen, the conical fine filter screen and multiple extrusion ridges finally enter the collection disk through the discharge ports for collection. The mesh holes of the collection disk are the same size as those of the conical fine filter screen, which is conducive to collecting impurities. The filtered molten polyester resin is discharged from the outermost discharge port.

[0028] 5. By installing a flushing pipe, a push plate and a discharge channel, when it is necessary to clean the filter screen regularly, just open the solenoid valve in the water pipe, and the second suction pump sucks the cleaning liquid. The cleaning liquid enters the flushing pipe through the water pipe and finally rushes towards the outer surfaces of the conical fine filter screen and the conical coarse filter screen through multiple flushing holes to achieve backwashing. The impurities finally gather in the collection disk. The rotating pipe drives the push plate to rotate to gather the impurities, and the impurities can be discharged through the discharge channel by opening the impurity discharge port through the opening and closing component. Description of the Drawings

[0029] Figure 1 is the top-down perspective view of the present invention;

[0030] Figure 2 is the bottom-up perspective view of the present invention;

[0031] Figure 3Cross-sectional view of the present invention;

[0032] Figure 4 Stereogram of the centrifugal tank proposed by the present invention;

[0033] Figure 5 Cross-sectional view of the filter box proposed by the present invention;

[0034] Figure 6 Top cross-sectional view of the filter box proposed by the present invention;

[0035] Figure 7 Top view of the multi-loop discharge port proposed by the present invention.

[0036] In the figure: 1 material tank, 2 overflow port, 3 transition tank, 4 support, 5 first suction pump, 6 frame, 7 centrifugal tank, 8 gear ring, 9 fixed seat, 10 liquid inlet pipe, 11 hydraulic cylinder, 12 hanging plate, 13 large gear disc, 14 first motor, 15 second suction pump, 16 second motor, 17 radial push-pull port, 18 suction pipe, 19 discharge pipe, 20 three-way valve, 21 annular collection pool, 22 gear, 23 filter box, 24 liquid outlet cover, 25 collection wire mesh, 26 push plate, 27 waste discharge port, 28 discharge channel, 29 rotating pipe, 30 liquid outlet hole, 31 connecting arm, 32 conical coarse filter screen, 33 extrusion rib, 34 conical fine filter screen, 35 flushing pipe, 36 discharge port, 37 rotary joint, 38 support sliding seat, 39 centrifugal discharge pipe, 40 centrifugal inlet pipe, 41 inclined scraper. Detailed implementation manners

[0037] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention.

[0038] Refer to Figures 1-7 , a high-temperature resistant polyester resin molten state impurity automatic separation device, including a frame 6, a support 4 is fixedly installed on the frame 6, and further includes:

[0039] A material tank 1 and a transition tank 3, the transition tank 3 is sleeved outside the material tank 1 and fixed on the support 4. The top and bottom of the material tank 1 are respectively connected with a feed pipe and a discharge pipe. The discharge pipe is located inside the transition tank 3. An overflow port 2 is provided on the side wall of the top of the material tank 1. The molten polyester resin first enters the material tank 1. When the inlet speed is greater than the discharge speed, it enters the transition tank 3 through the overflow port 2.

[0040] A plurality of centrifugal tanks 7 are circumferentially distributed around the outer periphery of the transition tank 3. A first suction pump 5 is installed at the bottom of the transition tank 3. The discharge end of the first suction pump 5 is circumferentially connected with a plurality of liquid inlet pipes 10. The top and bottom of the centrifugal tank 7 are respectively provided with a centrifugal inlet pipe 40 and a centrifugal outlet pipe 39. The end of the liquid inlet pipe 10 is docked with the centrifugal inlet pipe 40 through a rotary joint 37. The centrifugal outlet pipe 39 is docked with a discharge pipe 19 through a rotary joint 37. The first suction pump 5 is started to pump out the polyester resin in the transition tank 3, and it is injected into the plurality of centrifugal tanks 7 through the plurality of liquid inlet pipes 10 and the centrifugal inlet pipe 40 to separate the metal particle impurities with significant density differences, which are deposited at the bottom of the tank after stopping rotation.

[0041] The centrifugal driving mechanism includes a rotating assembly installed on the frame 6 and a plurality of radial push-pull assemblies circumferentially installed on the side wall of the transition tank 3, so that half of the centrifugal tanks 7 are in the centrifugal state and the other half of the centrifugal tanks 7 are in the separation and discharge state. The rotating assembly includes a first motor 14 installed on the frame 6. A large gear disc 13 is fixed to the output end of the first motor 14. A gear ring 8 that cooperates with the large gear disc 13 is fixedly sleeved on the centrifugal tank 7. The radial push-pull assembly includes a fixed seat 9 fixedly installed on the side wall of the transition tank 3. A hydraulic cylinder 11 is radially fixedly installed on the fixed seat 9. A hanging plate 12 is fixed to the telescopic end of the hydraulic cylinder 11. The corresponding upper rotary joint 37 is fixedly installed on the hanging plate 12. A plurality of radial push-pull openings 17 are opened at the top of the frame 6. A support sliding seat 38 is slidably installed in the radial push-pull opening 17. The corresponding lower rotary joint 37 is fixedly installed on the support sliding seat 38. The hydraulic cylinder 11 is started to radially pull the centrifugal tank 7 through the hanging plate 12, and the support sliding seat 38 slides synchronously, so that the gear ring 8 meshes with the large gear disc 13. The first motor 14 is started to drive the large gear disc 13 to rotate, and then the plurality of centrifugal tanks 7 can be driven to rotate quickly. Just separate the gear ring 8 from the large gear disc 13 to stop rotation.

[0042] The suction mechanism is installed below the frame 6. The suction mechanism includes a second suction pump 15 installed on the frame 6. The suction end of the second suction pump 15 is circumferentially connected to a plurality of suction pipes 18. A solenoid valve is installed in each of the plurality of suction pipes 18. The end of the suction pipe 18 is connected to one side of the bottom of the discharge pipe 19. The length of the discharge pipe 19 from the rotary joint 37 to the suction pipe 18 is the metal suction section. A three-way valve 20 is installed at the connection between the suction pipe 18 and the discharge pipe 19. An annular collection pool 21 is provided on the top of the filter box 23. The lower end of the discharge pipe 19 corresponds to the annular collection pool 2 1. The discharge end of the second suction pump 15 is connected to a rotating pipe 29 through a rotary joint 37. The rotating pipe 29 extends into the filter box 23 and has multiple liquid outlet holes 30 on its side wall. The solenoid valve in the corresponding suction pipe 18 is opened. Initially, the three-way valve 20 connects the discharge pipe 19 with the suction pipe 18. The second suction pump 15 suctions and draws the precipitated metal particle impurities into the metal suction section of the discharge pipe 19. Then the three-way valve 20 rotates to disconnect the suction pipe 18. The metal particle impurities in the metal suction section can be discharged through the lower end of the discharge pipe 19 to be collected in the annular collection tank 21.

[0043] The filter box 23 is fixedly mounted on the frame 6. A conical coarse filter 32 and a conical fine filter 34 with conical surfaces are installed in the filter box 23 from the inside to the outside. The suction mechanism draws the molten polyester resin into the filter box 23, causing it to flow through the conical coarse filter 32 and the conical fine filter 34 in sequence for graded filtration.

[0044] Furthermore, the circumferential side walls of the conical coarse filter 32 and the conical fine filter 34 are connected in series with a plurality of extruded ribs 33. The cross-section of the extruded ribs 33 is triangular. The extruded ribs 33 serve as filter screens. During the rotation process, the molten polyester resin can intermittently gather in the extruded ribs 33, generating instantaneous extrusion force, thereby increasing the pass rate and further improving the filtering effect.

[0045] A plurality of groups of inclined scrapers 41 are installed in the filter box 23, and each group of inclined scrapers 41 respectively contacts the conical coarse filter 32, the conical fine filter 34 and the inclined inner wall of the filter box 23. A second motor 16 is installed on the frame 6, and the output end of the second motor 16 is connected to the rotating tube 29 through a pair of gears 22. The tops of the plurality of groups of inclined scrapers 41 are fixedly connected to the connecting arms 31, and the ends of the connecting arms 31 are fixedly installed on the side walls of the rotating tube 29. The rotating tube 29 simultaneously drives the plurality of inclined scrapers 41 to rotate through the connecting arms 31. The inclined scrapers 41 rotate along the mesh surface, on the one hand, pushing the molten polyester resin to rotate. Under the action of centrifugal force, the inclined scrapers 41 cover the entire mesh surface of the conical coarse filter 32 and the conical fine filter 34, thereby increasing the filtration area and improving the filtration speed, so that the molten polyester resin passes through the conical coarse filter 32 and the conical fine filter 34 in turn for graded filtration. On the other hand, the impurities on the mesh surface can be scraped off to avoid clogging, so as to maintain a high-efficiency filtration state.

[0046] In addition, multiple rings of discharge ports 36 are provided at the bottom of the filtration tank 23. The multiple rings of discharge ports 36 respectively correspond to the bottom of the conical coarse filter screen 32, the bottom of the extrusion rib 33, the bottom of the conical fine filter screen 34, and the bottom outside the filtration tank 23. A liquid discharge cover 24 is also fixed to the filtration tank 23. The filtered molten polyester resin is discharged from the outermost discharge port 36.

[0047] A collection wire mesh tray 25 is fixedly installed at the bottom of the filtration tank 23. The discharge ports 36 at the bottom of the conical coarse filter screen 32, the bottom of the extrusion rib 33, and the bottom of the conical fine filter screen 34 correspond to the collection wire mesh tray 25. The lower end of the rotating pipe 29 extends into the collection wire mesh tray 25 and is fixed with a push plate 26. A waste discharge port 27 is radially opened at the bottom of the collection wire mesh tray 25. An opening and closing assembly is installed in the waste discharge port 27. A discharge channel 28 is docked at the bottom of the waste discharge port 27. A flushing pipe 35 is provided on the side of the inclined scraper 41 that abuts against the conical fine filter screen 34 and the inner wall of the filtration tank 23. A plurality of flushing holes are provided on the side wall of the flushing pipe 35. A water pipe connecting the flushing pipe 35 and the rotating pipe 29 is provided inside the connecting arm 31. An electromagnetic valve is installed in the water pipe. When the filter screen needs to be cleaned regularly, only the electromagnetic valve in the water pipe needs to be opened. The second suction pump 15 sucks the cleaning liquid. The cleaning liquid enters the flushing pipe 35 through the water pipe and finally rushes towards the outer surfaces of the conical fine filter screen 34 and the conical coarse filter screen 32 through the plurality of flushing holes to achieve back flushing. The impurities finally gather in the collection wire mesh tray 25. The rotating pipe 29 drives the push plate 26 to rotate to gather the impurities. By opening the waste discharge port 27 through the opening and closing assembly, the impurities can be discharged through the discharge channel 28.

[0048] The molten polyester resin first enters the material tank 1. When the entering speed is greater than the discharging speed, it enters the transition tank 3 through the overflow port 2. The first suction pump 5 is started to extract the polyester resin in the transition tank 3 and inject it into a plurality of centrifugal tanks 7 through a plurality of liquid inlet pipes 10 and the centrifugal inlet pipe 40, realizing sub-packaging while sharing the load and meeting the centrifugal speed. The hydraulic cylinder 11 is started to radially pull the centrifugal tanks 7 through the hanging plate 12, and the supporting sliding seat 38 slides synchronously, so that the gear ring 8 meshes with the large gear disk 13. The first motor 14 is started to drive the large gear disk 13 to rotate, which can drive a plurality of centrifugal tanks 7 to rotate rapidly to separate the metal particle impurities with significant density differences. After stopping the rotation, they are deposited at the bottom of the tank. Stopping the rotation only requires the separation of the gear ring 8 and the large gear disk 13, reducing the subsequent filtration burden. In order to meet the process of continuous centrifugation and continuous filtration, half of the centrifugal tanks 7 are in the centrifugal state, and the other half of the centrifugal tanks 7 are in the separation and discharge state. The two processes are carried out synchronously with high efficiency.

[0049] When it is necessary to discharge the precipitated metal particle impurities, just open the solenoid valve in the corresponding suction pipe 18 first. Initially, the three-way valve 20 connects the discharge pipe 19 with the suction pipe 18, and the second suction pump 15 sucks to draw the precipitated metal particle impurities into the metal suction section of the discharge pipe 19. Then the three-way valve 20 rotates to disconnect the suction pipe 18, and the metal particle impurities in the metal suction section can be discharged to the annular collection pool 21 through the lower end of the discharge pipe 19 for collection. After the metal impurities are separated, the suction pipe 18 and the discharge pipe 19 are connected again, and the molten polyester resin can be drawn out into the filter box 23 to reduce the subsequent filtration burden.

[0050] The sucked molten polyester resin enters the rotating pipe 29 and is discharged through a plurality of liquid outlet holes 30. Start the second motor 16, drive the rotating pipe 29 to rotate through a pair of gears 22, and evenly throw the molten polyester resin onto the surface of the conical coarse filter screen 32. At the same time, the rotating pipe 29 drives a plurality of inclined scraping plates 41 to rotate through the connecting arm 31. The inclined scraping plates 41 rotate against the mesh surface. On the one hand, it promotes the rotation of the molten polyester resin. Under the action of centrifugal force, it covers the mesh surfaces of the entire conical coarse filter screen 32 and the conical fine filter screen 34, increasing the filtration area and improving the filtration speed, so that the molten polyester resin passes through the conical coarse filter screen 32 and the conical fine filter screen 34 in turn for grading filtration. On the other hand, it can scrape off the impurities on the mesh surface to prevent them from blocking and keep it in an efficient filtration state.

[0051] During the rotation process of the molten polyester resin, it can intermittently gather in the extrusion rib 33, generating an instantaneous extrusion force to improve the passing rate and further enhance the filtration effect. And it can also gather the impurities in the extrusion rib 33. The impurities gathered in the conical coarse filter screen 32, the conical fine filter screen 34 and the plurality of extrusion ribs 33 finally enter the collection wire mesh tray 25 through the discharge port 36 for collection. The mesh hole size of the collection wire mesh tray 25 is the same as that of the conical fine filter screen 34, which is conducive to collecting impurities. The filtered molten polyester resin is discharged from the outermost discharge port 36.

[0052] When it is necessary to clean the filter screen regularly, just open the solenoid valve in the water pipe, and the second suction pump 15 sucks the cleaning liquid. The cleaning liquid enters the flushing pipe 35 through the water pipe and finally rushes towards the outer surfaces of the conical fine filter screen 34 and the conical coarse filter screen 32 through a plurality of flushing holes to realize back flushing. The impurities finally gather in the collection wire mesh tray 25. The rotating pipe 29 drives the push plate 26 to rotate to gather the impurities, and opens the impurity discharge port 27 through the opening and closing assembly, and the impurities can be discharged through the discharge channel 28.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin, comprising a frame, and a bracket fixedly installed on the frame, characterized in that, Also includes: A material tank and a transition tank, wherein the transition tank is sleeved on the outside of the material tank and fixed on the bracket, and is used for injecting molten polyester resin; Multiple centrifugal tanks are circumferentially distributed around the transition tank and are used to centrifugally precipitate metal particle impurities in the molten polyester resin to the bottom; The centrifugal drive mechanism includes a rotating assembly mounted on a frame and a plurality of radial push-pull assemblies circumferentially mounted on the side wall of the transition tank, so that half of the centrifugal tank is in a centrifugal state and the other half of the centrifugal tank is in a separation and discharge state; The suction mechanism is installed under the frame and is used to separate and discharge metal particle impurities and extract the remaining molten polyester resin; A filter box is fixedly mounted on the frame, wherein a conical coarse filter screen and a conical fine filter screen are respectively mounted in the filter box from the inside to the outside. The suction mechanism extracts the molten polyester resin into the filter box, causing the resin to flow through the conical coarse filter screen and the conical fine filter screen in sequence. Multiple groups of inclined scrapers are installed in the filter box. Each group of inclined scrapers respectively contacts the conical coarse filter screen, the conical fine filter screen and the inclined inner wall of the filter box, and is used to push the molten polyester resin to rotate to increase the contact area with the screen surface, and is also used to clean the screen surface.

2. The automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 1, characterized in that, The top and bottom of the material tank are respectively connected with a feed pipe and a discharge pipe, the discharge pipe is located in the transition tank, and the top side wall of the material tank is provided with an overflow port.

3. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 1, characterized in that, A first suction pump is installed at the bottom of the transition tank, and a plurality of liquid inlet pipes are circumferentially connected to the discharge end of the first suction pump. A centrifugal inlet pipe and a centrifugal outlet pipe are respectively provided at the top and bottom of the centrifuge tank. The end of the liquid inlet pipe is connected to the centrifugal inlet pipe through a rotary joint, and the centrifugal outlet pipe is connected to the discharge pipe through a rotary joint.

4. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 1, characterized in that, The rotating assembly includes a first motor mounted on a frame, a large toothed disc is fixed to an output end of the first motor, and a fixed sleeve on the centrifugal tank is provided with a gear ring matched with the large toothed disc.

5. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 3, characterized in that, The radial push-pull assembly includes a fixed seat fixedly installed on the side wall of the transition tank, a hydraulic cylinder is radially fixedly installed on the fixed seat, a hanging plate is fixed to the telescopic end of the hydraulic cylinder, and the corresponding upper rotary joint is fixedly installed on the hanging plate, a plurality of radial push-pull openings are opened on the top of the frame, a support slide is slidably installed in the radial push-pull opening, and the lower rotary joint is fixedly installed on the corresponding support slide.

6. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 3, characterized in that, The suction mechanism includes a second suction pump installed on the frame, and the suction end of the second suction pump is circumferentially connected to multiple suction pipes, and solenoid valves are installed in the multiple suction pipes. The end of the suction pipe is connected to the bottom side of the discharge pipe, and the length of the discharge pipe from the rotary joint to the suction pipe is a metal suction section. A three-way valve is installed at the connection between the suction pipe and the discharge pipe. An annular collection pool is provided on the top of the filter box, and the lower end of the discharge pipe corresponds to the annular collection pool. The discharge end of the second suction pump is connected to a rotating pipe through a rotary joint. The rotating pipe extends into the filter box, and a plurality of liquid outlet holes are provided on the side wall.

7. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 6, characterized in that, A second motor is installed on the frame, and the output end of the second motor is connected to the rotating tube through a pair of gear transmissions. The tops of the multiple groups of inclined scrapers are fixedly connected to connecting arms, and the ends of the connecting arms are fixedly installed on the side walls of the rotating tube.

8. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 7, characterized in that, A plurality of extrusion ribs are connected in series on the circumferential side walls of the conical coarse filter screen and the conical fine filter screen. The cross-section of the extrusion ribs is triangular, and the extrusion ribs are filter meshes.

9. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 8, characterized in that, A plurality of rows of discharge ports are provided at the bottom of the filter box. The plurality of rows of discharge ports respectively correspond to the bottom of the conical coarse filter screen, the bottom of the extrusion ribs, the bottom of the conical fine filter screen, and the bottom of the outer side of the filter box. A collection wire mesh tray is fixedly installed at the bottom of the filter box. The discharge ports at the bottom of the conical coarse filter screen, the bottom of the extrusion ribs, and the bottom of the conical fine filter screen correspond to the collection wire mesh tray. The lower end of the rotating pipe extends into the collection wire mesh tray and is fixed with a push plate. A waste discharge port is radially opened at the bottom of the collection wire mesh tray. An opening and closing assembly is installed in the waste discharge port, and a discharge channel is docked at the bottom of the waste discharge port. A liquid outlet hood is also fixed to the filter box.

10. An automatic separation device for impurities in the molten state of a high-temperature resistant polyester resin according to claim 9, characterized in that, A flushing pipe is provided on the side of the inclined scraper that abuts against the inner wall of the conical fine filter screen and the filter box. A plurality of flushing holes are provided on the side wall of the flushing pipe. A water pipe connecting the flushing pipe and the rotating pipe is provided in the connecting arm, and an electromagnetic valve is installed in the water pipe.

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