A filtering device

Abstract

The present invention discloses a filtering device, including a first filtering barrel, a liquid inlet pipe and a liquid outlet pipe, a first valve is provided on the passage connecting the liquid inlet pipe to the liquid outlet pipe, a second valve is provided on the passage connecting the liquid inlet pipe to the first filtering barrel, and a third valve is provided on the passage connecting the first filtering barrel to the liquid outlet pipe. The filtering device has a simple and novel structure, and can select whether to allow the liquid to flow through the first filtering barrel for filtration by controlling the first, second and third valves. When a blockage occurs in the first filtering barrel, the second and third valves can be closed, and the first valve can be opened, so that the liquid in the liquid inlet pipe does not enter the first filtering barrel, so that the processing equipment can be unblocked while the first filtering barrel is not shut down; when the first filtering barrel is unblocked, the second and third valves can be opened and the first valve can be closed, so as to filter the liquid, thereby achieving the purpose of ensuring the processing quality of the processing equipment.

Description

Technical Field

[0001] The invention relates to a filtering device. Background Art

[0002] Polishing liquid and liquids with similar properties to polishing liquid (including but not limited to grinding liquid, medium grinding liquid, fine grinding liquid, etc.) contain fine abrasive particles, which are the main functional components of the liquid. After the polishing liquid is used for a period of time, many solid impurities will be generated during the process of polishing the product. When these solid impurities reach a certain amount, they will affect the processing quality, and the polishing liquid needs to be replaced.

[0003] After analyzing the replaced polishing liquid, it was found that the effective components of the polishing liquid (i.e., effective abrasive particles) were still there. The main problem was that there were too many solid impurities. Moreover, the particle size of the solid impurities and the effective abrasive particle size of the polishing liquid itself were in different ranges. Generally, the particle size of the solid impurities was above 5μm, and the particle size of the abrasive particles was below 5μm. Therefore, filtering equipment for polishing liquid and liquids with similar properties to polishing liquid came into being. However, the existing filtering equipment needs to extract the polishing liquid from the processing machine before filtering the polishing liquid and liquids with similar properties to polishing liquid, which will undoubtedly affect production efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a filtering device with a new structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a filtering device, including a first filter barrel, a liquid inlet pipe and a liquid outlet pipe, a first valve is provided on the passage connecting the liquid inlet pipe to the liquid outlet pipe, a second valve is provided on the passage connecting the liquid inlet pipe to the first filter barrel, and a third valve is provided on the passage connecting the first filter barrel to the liquid outlet pipe.

[0006] The beneficial effects of the present invention are as follows: the filtering device has a simple and novel structure, and can select whether to allow the liquid to flow through the first filter barrel for filtration by controlling the first, second and third valves. When a blockage occurs in the first filter barrel, the second and third valves can be closed, and the first valve can be opened, so that the liquid in the liquid inlet pipe does not enter the first filter barrel, thereby enabling the processing equipment to dredge the first filter barrel without stopping the machine; when the first filter barrel is dredged, the second and third valves can be opened and the first valve can be closed, thereby achieving filtration of the liquid, thereby achieving the purpose of ensuring the processing quality of the processing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the overall structure of the filtering device according to the first embodiment of the present invention;

[0008] Figure 2An exploded view of a filtering device according to Embodiment 1 of the present invention;

[0009] Figure 3 It is a cross-sectional view of a part of the structure of the filtering device according to the first embodiment of the present invention.

[0010] Description of labels:

[0011] 1. First filter barrel; 11. Main chamber; 12. Liquid inlet chamber; 13. Transition chamber;

[0012] 2. Liquid inlet pipe;

[0013] 3. Liquid outlet pipe;

[0014] 41, first valve; 42, second valve; 43, third valve; 44, fourth valve;

[0015] 5. Filter cartridge;

[0016] 6. Motor;

[0017] 7. Blowing nozzle;

[0018] 8. Chip removal assembly; 81. Vacuum pump; 82. Filter device; 821. Second filter barrel; 822. Filter basket; 831. Chip suction pipe; 832. Large suction nozzle; 833. Small suction nozzle; 83. Chip removal pipe; 84. Reflux pump;

[0019] 91. Driving gear; 92. Driven gear; 93. Hollow main shaft; 94. Reciprocating screw; 95. Screw seat; 96. Connecting rod; 97. Support frame; 98. Roller;

[0020] 10. Rack; 101. Slide plate;

[0021] 20. Pressure detection device;

[0022] 30. Controller. DETAILED DESCRIPTION

[0023] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0024] Please refer to Figures 1 to 3 A filtering device includes a first filter barrel 1, a liquid inlet pipe 2 and a liquid outlet pipe 3, a first valve 41 is provided on the passage connecting the liquid inlet pipe 2 to the liquid outlet pipe 3, a second valve 42 is provided on the passage connecting the liquid inlet pipe 2 to the first filter barrel 1, and a third valve 43 is provided on the passage connecting the first filter barrel 1 to the liquid outlet pipe 3.

[0025] From the above description, it can be seen that the beneficial effects of the present invention are: the filtering equipment has a simple and novel structure, and by controlling the first, second, and third valves, it can be selected whether to allow the liquid to flow through the first filter barrel 1 for filtration. During the filtering process of the polishing liquid and the liquid with similar properties to the polishing liquid and during the unblocking process of the first filter barrel 1, there is no need to extract the polishing liquid and the liquid with similar properties to the polishing liquid from the processing machine, which is beneficial to ensuring the production efficiency of the processing machine.

[0026] Furthermore, it also includes a motor 6 and a filter cartridge 5 arranged inside the first filter barrel 1, the motor 6 is connected to the filter cartridge 5 to drive the filter cartridge 5 to rotate, the passage of the liquid inlet pipe 2 connected to the first filter barrel 1 is connected to the inside of the filter cartridge 5, and the passage of the first filter barrel 1 connected to the liquid outlet pipe 3 is connected to the outside of the filter cartridge 5.

[0027] From the above description, it can be seen that the filter cartridge 5 can separate solid impurities from abrasive particles by utilizing the difference in particle size of solid impurities and particle size of abrasive particles of the functional liquid (i.e., polishing liquid and liquid with similar properties to polishing liquid), thereby filtering the functional liquid. The rotating filter cartridge 5 has a larger contact area. When individual filter holes are blocked, there are still many filter holes that are not blocked, thus reducing the frequency of dredging the filter cartridge 5, thereby ensuring the processing quality of the processing machine.

[0028] Furthermore, the first filter barrel 1 is provided with a plurality of blowing nozzles 7 facing the filter cartridge 5 .

[0029] It can be seen from the above description that the air blowing nozzle 7 can blow the solid impurities that clog the filter holes on the filter cartridge 5 back into the inside of the filter cartridge 5, thereby improving the clogging phenomenon of the filter cartridge 5 and further reducing the frequency of dredging the filter cartridge 5.

[0030] Furthermore, it also includes a chip removal component 8, which includes a vacuum pump 81, a filter device 82 and a chip suction component, and the chip suction component is arranged in the first filter barrel 1, and the chip suction component includes a chip suction pipe 831 and a suction nozzle component arranged on the chip suction pipe 831, and the suction nozzle assembly is located in the filter cartridge 5, and the chip suction pipe 831 is connected to the vacuum pump 81 through a chip removal pipe 83, and the chip removal pipe 83 is provided with a fourth valve 44, and the vacuum pump 81 is connected to the filter device 82, and the liquid outlet of the filter device 82 is connected to the liquid outlet pipe 3 through a return liquid pipe.

[0031] As can be seen from the above description, when the first valve 41 is opened and the second and third valves are closed, the chip removal assembly 8 can absorb the residual functional liquid and solid impurities in the first filter barrel 1 into the filter device 82 which is easy to clear, thereby cleaning the first filter barrel 1, greatly reducing the difficulty of cleaning the first filter barrel 1. At the same time, the functional liquid originally remaining in the first filter barrel 1 can also flow back to the liquid outlet pipe 3, reducing the waste of functional liquid.

[0032] Furthermore, the liquid return pipe is provided with a fifth valve and / or a liquid return pump.

[0033] It can be seen from the above description that the fifth valve and / or the liquid return pump can control whether the functional liquid filtered in the filtering device 82 flows back to the liquid outlet pipe 3 .

[0034] Furthermore, the suction nozzle assembly includes a large-mouth suction nozzle 832 and a small-mouth suction nozzle 833 , there is a gap between the large-mouth suction nozzle 832 and the inner wall of the filter cartridge 5 , and the small-mouth suction nozzle 833 contacts the inner wall of the filter cartridge 5 .

[0035] From the above description, it can be seen that the large-mouth suction nozzle 832 is used to suck up solid impurities with larger particle sizes, especially the solid impurities blown back into the filter cartridge 5 by the air nozzle 7; the small-mouth suction nozzle 833 is used to suck up solid impurities with smaller particle sizes, especially the solid impurities that clog the filter holes of the filter cartridge 5, thereby achieving good dredging of the filter cartridge 5.

[0036] Furthermore, the small-mouth suction nozzle 833 is an elastic suction nozzle.

[0037] It can be seen from the above description that the elastic suction nozzle can better clear the filter holes of the filter cartridge 5.

[0038] Furthermore, it also includes a driving gear 91, a driven gear 92, a hollow main shaft 93, a reciprocating screw 94 and a screw seat 95. The output end of the motor 6 is connected to the driving gear 91, and the driven gear 92 meshing with the driving gear 91 is connected to the filter cartridge 5 through the hollow main shaft 93. A partial area of ​​the chip suction tube 831 is arranged in the hollow main shaft 93, and one end of the chip suction tube 831 away from the suction nozzle assembly is connected to the reciprocating screw 94. The screw seat 95 is arranged on the reciprocating screw 94 and is fixedly connected to the driven gear 92.

[0039] It can be seen from the above description that while the motor 6 drives the filter cartridge 5 to rotate, the reciprocating screw 94 can drive the suction nozzle assembly to reciprocate along the axial direction of the filter cartridge 5, so that the suction nozzle assembly can dredge the filter holes of the filter cartridge 5 in all directions, which is beneficial to ensure the dredging quality of the filter cartridge 5. At the same time, the reciprocating motion of the reciprocating screw 94 to pass the suction nozzle assembly back and forth can reduce the number of suction nozzle assemblies to ensure the suction force of the suction nozzle assembly and reduce the manufacturing cost of the dust suction assembly. In addition, in the present technical solution, the motor 6 not only drives the filter cartridge 5 to rotate, but also drives the dust suction assembly to perform linear reciprocating motion, thus achieving multiple uses of one item, reducing the manufacturing cost of the filtering equipment while reducing the energy consumption of the filtering equipment, making the filtering equipment more environmentally friendly.

[0040] Furthermore, the first filter barrel 1 has a transition chamber 13, the passage of the first filter barrel 1 connected to the liquid outlet pipe 3 is not connected to the transition chamber 13, the chip removal pipe 83 is connected to the transition chamber 13, the area where the hollow main shaft 93 is located in the transition chamber 13 is provided with a through hole connecting its inner wall and outer wall, and the chip suction pipe 831 is connected to the transition chamber 13 through the through hole.

[0041] It can be seen from the above description that the existence of the transition chamber 13 facilitates the pipeline design of the filtering device.

[0042] Furthermore, a support frame 97 is provided at one end of the reciprocating screw rod 94 away from the hollow main shaft 93 , and a roller 98 is provided on the support frame 97 .

[0043] It can be seen from the above description that the support frame 97 is used to support the reciprocating screw rod 94, which is beneficial to ensure the working stability of the reciprocating screw rod 94.

[0044] Embodiment 1

[0045] Please refer to Figures 1 to 3 Embodiment 1 of the present invention is: a filtering device for filtering a functional liquid mixed with solid impurities, wherein the functional liquid is a liquid with abrasive particles, including but not limited to polishing liquid, grinding liquid, intermediate grinding liquid, fine grinding liquid, etc.

[0046] The filtering device includes a first filter barrel 1, a liquid inlet pipe 2 and a liquid outlet pipe 3, a first valve 41 is provided on the passage connecting the liquid inlet pipe 2 to the liquid outlet pipe 3, a second valve 42 is provided on the passage connecting the liquid inlet pipe 2 to the first filter barrel 1, a third valve 43 is provided on the passage connecting the first filter barrel 1 to the liquid outlet pipe 3, a filter cartridge 5 is provided in the first filter barrel 1, the passage connecting the liquid inlet pipe 2 to the first filter barrel 1 is connected to the interior of the filter cartridge 5, and the passage connecting the first filter barrel 1 to the liquid outlet pipe 3 is connected to the exterior of the filter cartridge 5, that is, the liquid inside the filter cartridge 5 is a functional liquid that has not been filtered and is mixed with solid impurities; the liquid outside the filter cartridge 5 is a filtered functional liquid that is not mixed with solid impurities or is mixed with solid impurities with a particle size smaller than that of the grinding particles.

[0047] Please combine Figure 2 and Figure 3 In this embodiment, the filter cartridge 5 includes an annular filter screen and two blocking parts blocking both ends of the annular filter screen, the annular filter screen is provided with a plurality of filtering holes, and the blocking parts are used to prevent the functional liquid to be filtered from flowing directly to the outside of the filter cartridge 5 without being filtered by the annular filter screen. In some embodiments, the blocking parts can also be made of a filter screen, or filtering holes are provided on the blocking parts.

[0048] like Figure 3As shown, as a preferred embodiment, the filtering device further includes a motor 6 and a filter cartridge 5 disposed inside the first filter barrel 1 , and the motor 6 is connected to the filter cartridge 5 to drive the filter cartridge 5 to rotate.

[0049] In order to improve the clogging of the filter cartridge 5, the first filter barrel 1 is provided with a plurality of air blowing nozzles 7 facing the filter cartridge 5. In this embodiment, the number of the air blowing nozzles 7 is multiple, and the multiple air blowing nozzles 7 are arranged in at least one row along the axial direction of the filter cartridge 5. Preferably, the air blowing direction of the air blowing nozzles 7 is toward the central axis of the filter cartridge 5, so that the air blowing nozzles 7 can blow off the solid impurities that clog the filter holes of the filter cartridge 5 to a great extent.

[0050] Please combine Figures 1 to 3 In order to facilitate cleaning of the filter cartridge 5, the filtering device further comprises a chip removal assembly 8, the chip removal assembly 8 comprises a vacuum pump 81, a filter device 82 and a chip suction assembly, the chip suction assembly is arranged in the first filter barrel 1, the chip suction assembly comprises a chip suction pipe 831 and a suction nozzle assembly arranged on the chip suction pipe 831, the suction nozzle assembly is arranged in the filter cartridge 5, the chip suction pipe 831 is connected to the vacuum pump 81 through a chip removal pipe 83, the chip removal pipe 83 is provided with a fourth valve 44, the vacuum pump 81 is connected to the filter device 82, and the liquid outlet of the filter device 82 is connected to the liquid outlet pipe 3 through a liquid return pipe. In this embodiment, the filter device 82 comprises a second filter barrel 821 with a take-in and put-out port on the top, a filter basket 822 is placed in the second filter barrel 821, the liquid sucked by the vacuum pump 81 is transported to the filter basket 822, and the filter basket 822 realizes the filtration of the liquid sucked by the vacuum pump 81. When the filtering device 82 is finished filtering, the first filter barrel 1 is reactivated and the filtering device 82 is deactivated, the maintenance personnel can easily take out the filter basket 822 and clean it. It should be noted that the cleaning time of the filter basket 822 is not limited to the working process of the first filter barrel 1. The vacuum pump 81 can also be suspended during the working process of the filtering device 82 to dredge the filter basket 822. It is easy to understand that in other embodiments, the access port can also be set on the side wall of the second filter barrel 821 or other positions.

[0051] In this embodiment, the liquid return pipe is provided with a fifth valve and a liquid return pump. In other embodiments, only one of the fifth valve and the liquid return pump may be provided.

[0052] The suction nozzle assembly includes a large suction nozzle 832 and a small suction nozzle 833. There is a gap between the large suction nozzle 832 and the inner wall of the filter cartridge 5, and the small suction nozzle 833 contacts the inner wall of the filter cartridge 5. Preferably, the small suction nozzle 833 is an elastic suction nozzle. In this embodiment, the small suction nozzle 833 includes a seat body and a suction head mounted on the seat body, and the suction head is slidably arranged along the axial direction of the seat body. The small suction nozzle 833 also includes an elastic member, which connects the suction head with the seat body to drive the end of the suction head away from the seat body to contact the inner wall of the filter cartridge 5. The suction head has a small diameter and a large suction force, and can effectively suck out the solid impurities that block the filter holes of the filter cartridge 5, thereby clearing the filter holes of the filter cartridge 5; the large suction nozzle 832 has a large diameter and a gap between it and the inner wall of the filter cartridge 5, and can absorb large particles of solid impurities filtered by the filter cartridge 5.

[0053] like Figure 2 and Figure 3 As shown, as a preferred embodiment, the filtering device also includes a driving gear 91, a driven gear 92, a hollow main shaft 93, a reciprocating screw 94 and a screw seat 95. The output end of the motor 6 is connected to the driving gear 91, and the driven gear 92 meshing with the driving gear 91 is connected to the filter cartridge 5 through the hollow main shaft 93. A partial area of ​​the chip suction tube 831 is arranged in the hollow main shaft 93, and one end of the chip suction tube 831 away from the suction nozzle assembly is connected to the reciprocating screw 94. The screw seat 95 is arranged on the reciprocating screw 94 and is fixedly connected to the driven gear 92. When the driven gear 92 is driven by the driving gear 91, the screw seat 95 fixed on the driven gear 92 rotates synchronously with the driven gear 92, and the screw seat 95 rotates to drive the reciprocating screw 94 matched with it to make reciprocating motion, so that the suction nozzle assembly moves back and forth along the axial direction of the filter cartridge 5, and the filter cartridge 5 rotates under the drive of the hollow main shaft 93, and the cooperation between the rotating filter cartridge 5 and the linear reciprocating suction nozzle assembly can achieve the effect of dredging the filter holes of the filter cartridge 5 in all directions. In detail, the screw seat 95 is connected to the driven gear 92 through two connecting rods 96, and optionally, the central axis of the screw hole on the screw seat 95, the central axis of the driven gear 92, the central axis of the hollow main shaft 93, the central axis of the reciprocating screw 94 and the central axis of the dust suction tube 831 are coaxially arranged.

[0054] Specifically, the first filter barrel 1 is formed with three chambers separated from each other, one of which is a main chamber 11, and the filter cartridge 5 is located in the main chamber 11. A liquid inlet chamber 12 is provided on one side of the main chamber 11, and the liquid inlet chamber 12 is connected to the interior of the filter cartridge 5. A transition chamber 13 is provided on the other side of the main chamber 11. The passage of the first filter barrel 1 connected to the liquid outlet pipe 3 is only connected to the main chamber 11 but not to the transition chamber 13. The chip removal pipe 83 is connected to the transition chamber 13. The area of ​​the hollow main shaft 93 located in the transition chamber 13 is provided with a through hole connecting its inner wall and outer wall, and the chip suction pipe 831 is connected to the transition chamber 13 through the through hole.

[0055] In order to facilitate the handling, transfer and placement of the filtering device, the filtering device further comprises a frame 10 , on which the first filtering barrel 1 , the liquid inlet pipe 2 , the liquid outlet pipe 3 and the chip removal assembly 8 are all arranged.

[0056] Optionally, a support frame 97 is provided at one end of the reciprocating screw rod 94 away from the hollow main shaft 93 , a roller 98 is provided on the support frame 97 , a slide plate 101 is provided on the frame 10 , and the roller 98 rolls on the slide plate 101 .

[0057] Please combine Figure 1 and Figure 2 In order to monitor the blockage of the filter cartridge 5 in the filtering device, a pressure detection device 20 is provided on the liquid inlet pipe 2, and the pressure detection device 20 includes but is not limited to a liquid pressure detector. When the first valve 41 is closed and the second valve 42 and the third valve 43 are opened, if the pressure detection device 20 detects that the liquid pressure increases to a preset threshold, it means that the filter cartridge 5 is seriously blocked. At this time, the first valve 41 should be opened and the second valve 42 and the third valve 43 should be closed to suspend the filtration of the functional liquid, so that the functional liquid flowing into the liquid inlet pipe 2 can flow directly out of the liquid outlet pipe 3.

[0058] In order to enable the filtering equipment to achieve automatic cleaning and automatic regulation and reduce human resource consumption, in this embodiment, the first valve 41, the second valve 42, the third valve 43, the fourth valve 44 and the fifth valve are respectively electric signal control valves, and the electric signal control valves include but are not limited to pneumatic valves and electric valves. The filtering equipment also includes a controller 30, and the controller 30 is respectively connected to the first valve 41, the second valve 42, the third valve 43, the fourth valve 44, the fifth valve, the motor 6, the vacuum pump 81, the reflux pump 84 and the pressure detection device 20. The controller 30 includes an industrial single chip microcomputer. It is easy to understand that in order to save the manufacturing cost of the filtering equipment, in other embodiments, the first valve 41, the second valve 42, the third valve 43, the fourth valve 44 and the fifth valve can also be selected as manual valves.

[0059] The working process of the filtering device of this embodiment is briefly described as follows:

[0060] The normal working mode of the filtering device is introduced. The first valve 41 and the fourth valve 44 are closed, the second valve 42 and the third valve 43 are opened, and the functional liquid to be filtered is transported to the inside of the filter cartridge 5 through the liquid inlet pipe 2, and the filter cartridge 5 is driven by the motor 6 to rotate forward and reverse continuously (the forward and reverse interval time is controllable), so that the filter cartridge 5 is always kept in a centrifugal flushing state during the working process. In this case, the filter holes of the filter cartridge 5 are not easy to be blocked, and solid impurities are not easy to gather. It can ensure the flux of the filter cartridge 5 and keep the filtering accuracy of the filter cartridge 5 unchanged, thereby ensuring the filtering effect and efficiency of the functional liquid. After being filtered by the filter cartridge 5, the clean functional liquid flows through the third valve 43 back to the liquid outlet pipe 3 and is transported to the processing machine for use. In other words, the functional liquid can be filtered during the working process of the processing machine equipped with this filtering device.

[0061] Introduction to the self-cleaning mode of the filtration equipment: After working for a long time, when the filter hole of the filter cartridge 5 is blocked, the pressure detection device 20 on the liquid inlet pipe 2 detects that the liquid inlet pressure is greater than the preset threshold value. After the controller 30 receives the signal from the pressure detection device 20, the filtration equipment enters the self-cleaning mode. The controller 30 controls the second valve 42 and the third valve 43 to close, and the first valve 41, the fourth valve 44 and the fifth valve to open. At this time, the functional liquid to be filtered coming from the liquid inlet pipe 2 will no longer flow into the first filter barrel 1, but directly flow into the liquid outlet pipe 3 through the first valve 41, and then directly transported to the processing machine for use, so as to ensure the normal liquid supply of the processing machine. It is easy to understand that due to the closure of the third valve 43, there will be functional liquid and a large amount of solid impurities remaining in the first filter barrel 1.

[0062] At the same time, the air nozzle 7 blows out air, and uses the air to blow back the outer wall of the filter cartridge 5, so that at least part of the solid impurities that block the filter holes of the filter cartridge 5 fall back into the filter cartridge 5. The motor 6 and the vacuum pump 81 also start to work, and the functional liquid and solid impurities in the filter cartridge 5 are simultaneously pumped into the filter basket 822 in the second filter barrel 821, and the solid impurities are intercepted in the filter basket 822 (the filter basket 822 needs to be cleaned regularly by maintenance personnel), and the filtered functional liquid is transported back to the liquid outlet pipe 3 through the reflux pump 84 to serve the processing machine.

[0063] In more detail, in the self-cleaning mode of the filtering equipment, the motor 6 drives the filter cartridge 5 to rotate in one direction while driving the chip suction tube 831 to perform reciprocating linear motion in the front-to-back direction through the reciprocating screw 94, thereby ensuring that the suction nozzle assembly on the chip suction tube 831 can clean the impurities on the inner surface of the entire filter cartridge 5 in all directions.

[0064] It should be noted that when the first valve 41, the second valve 42, the third valve 43, the fourth valve 44 and the fifth valve are manually controlled valves, the control sequence of the valves on the filtering device can also be manually adjusted according to the above steps.

[0065] In summary, the filtering device provided by the present invention has a simple and novel structure. By controlling the first, second and third valves, it is possible to select whether to allow the liquid to flow through the first filter barrel for filtration. In the process of filtering the polishing liquid and the liquid with similar properties to the polishing liquid and in the process of unblocking the first filter barrel, it is not necessary to extract the polishing liquid and the liquid with similar properties to the polishing liquid from the processing machine, which is beneficial to ensuring the production efficiency of the processing machine. A chip removal component, a pressure detection device and a controller are provided, so that the filtering device can automatically enter the self-cleaning mode. In the self-cleaning mode, the filtering device can automatically unblock the filter holes of the filter cartridge to ensure the consistent filtering accuracy of the filter cartridge.

[0066] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A filtering device, comprising a first filtering barrel, a liquid inlet pipe and a liquid outlet pipe, characterized in that: A first valve is provided on the passage connecting the liquid inlet pipe to the liquid outlet pipe, a second valve is provided on the passage connecting the liquid inlet pipe to the first filter barrel, and a third valve is provided on the passage connecting the first filter barrel to the liquid outlet pipe; the filtering device also includes a motor, a filter cartridge provided inside the first filter barrel, and a chip removal assembly, the motor is connected to the filter cartridge to drive the filter cartridge to rotate, the chip removal assembly includes a chip suction assembly, the chip suction assembly is provided in the first filter barrel, the chip suction assembly includes a chip suction pipe and a suction nozzle assembly provided on the chip suction pipe, the suction nozzle assembly includes a large-mouth suction nozzle and a small-mouth suction nozzle, a gap is provided between the large-mouth suction nozzle and the inner wall of the filter cartridge, and the small-mouth suction nozzle contacts the inner wall of the filter cartridge; the filtering device further comprises a driving gear, a driven gear, a hollow main shaft, a reciprocating screw and a screw seat, the output end of the motor is connected to the driving gear, the driven gear meshing with the driving gear is connected to the filter cartridge through the hollow main shaft, a partial area of ​​the chip suction pipe is arranged in the hollow main shaft, one end of the chip suction pipe away from the suction nozzle assembly is connected to the reciprocating screw, and the screw seat is arranged on the reciprocating screw and is connected and fixed to the driven gear; The chip removal assembly also includes a vacuum pump and a filtering device. The suction nozzle assembly is located in the filter cartridge. The chip suction pipe is connected to the vacuum pump through a chip removal pipe. A fourth valve is provided on the chip removal pipe. The vacuum pump is connected to the filtering device. The liquid outlet of the filtering device is connected to the liquid outlet pipe through a return liquid pipe.

2. The filtering device according to claim 1, characterized in that: It also includes a motor and a filter cartridge arranged inside the first filter barrel, the motor is connected to the filter cartridge to drive the filter cartridge to rotate, the passage of the liquid inlet pipe connected to the first filter barrel is connected to the inside of the filter cartridge, and the passage of the first filter barrel connected to the liquid outlet pipe is connected to the outside of the filter cartridge.

3. The filtering device according to claim 2, characterized in that: The first filter barrel is provided with a plurality of air blowing nozzles facing the filter cartridge.

4. The filtering device according to claim 1, characterized in that: The liquid return pipe is provided with a fifth valve and / or a liquid return pump.

5. The filtering device according to claim 1, characterized in that: The small mouth suction nozzle is an elastic suction nozzle.

6. The filtering device according to claim 1, characterized in that: The first filter barrel has a transition chamber, the passage connecting the first filter barrel to the liquid outlet pipe is not connected to the transition chamber, the chip removal pipe is connected to the transition chamber, the area where the hollow main shaft is located in the transition chamber is provided with a through hole connecting its inner wall and outer wall, and the chip suction pipe is connected to the transition chamber through the through hole.

7. The filtering device according to claim 1, characterized in that: A support frame is provided at one end of the reciprocating screw rod away from the hollow main shaft, and a roller is provided on the support frame.

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