Grinding fluid treatment system combining precise filtration and centrifugal filtration

Abstract

The utility model discloses a precise filtration and centrifugal filtration combined grinding fluid treatment system, which comprises a precise filtration device and a centrifugal device, the precise filtration device comprises a filtration tank, and the filtration tank is communicated with a recovery fluid area through a blow-off pipe; the centrifugal device comprises a centrifugal machine, and a liquid inlet and a liquid outlet of the centrifugal machine are both communicated with the recovery liquid area. The precision filtering device and the centrifugal device are combined, so that the problem that high-concentration mixed liquid cannot be effectively treated when the precision filtering device is used for filtering grinding liquid is solved; and meanwhile, the defect that solid particles in low-concentration grinding fluid are not thoroughly separated when a centrifugal device is independently used as filtering equipment is overcome, so that the grinding fluid is more efficiently filtered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of grinding fluid filtering device, especially to a grinding fluid processing system of precision filtration and centrifugal filtration combination. BACKGROUND

[0002] In the grinding process of crystal materials (such as quartz, silicon), grinding fluid as a cooling and lubricating medium is crucial to the quality of workpiece finished products. High-quality grinding fluid not only ensures the machining accuracy, but also prolongs the tool life. Due to the high cost of grinding fluid, the industry usually adopts a recycling method to reduce costs. However, solid particles generated during the grinding process will mix into the grinding fluid, which will directly affect the grinding quality and the efficiency of the filtration system if these particles are not removed in time.

[0003] Although centrifuges are widely used in solid-liquid separation, their effect is not ideal when dealing with low-concentration solutions or solid with relatively light specific gravity, and the filtering precision is limited. Traditional centrifuges are more suitable for processing solutions with a relatively high proportion of solids.

[0004] In order to effectively remove these solid particles, a precision filtration device is usually used. The precision filtration device can effectively intercept solid particles in the grinding fluid, but over time, these solid particles will accumulate inside the filter tank and on the surface of the filter core, affecting the efficiency of liquid circulation. When the solid particles accumulate to a certain extent on the surface of the filter core, the system will automatically trigger a self-cleaning program. The self-cleaning process produces a mixture containing solid particles, and the concentration of solid particles in this mixture is extremely high. If it enters the filtration cycle of the grinding fluid again, it will again quickly accumulate and adhere to the inside of the filter tank and the surface of the filter core, causing the precision filtration device to need to start the self-cleaning program again, reducing the overall filtration efficiency of the equipment.

[0005] To solve the above problems, the present application provides a solution. SUMMARY

[0006] The utility model aims at providing a grinding fluid processing system of precision filtration and centrifugal filtration combination, using a precision filtration device as a pretreatment process for grinding fluid to remove most solid particles, and using a centrifuge as a post-treatment process to handle the high-concentration mixture generated during the filtration process.

[0007] Technical scheme: The grinding fluid processing system of precision filtration and centrifugal filtration combination comprises a precision filtration device and a centrifugal device, and the precision filtration device and the centrifugal device are both in communication with a recovery liquid area.

[0008] The precision filtration device comprises a filter tank, and the filter tank is in communication with the recovery liquid area through a blowdown pipe.

[0009] The centrifugal device comprises a centrifuge, and the liquid inlet and the liquid outlet of the centrifuge are communicated with the recovery liquid area.

[0010] Preferably, the centrifugal device further comprises a liquid storage tank, wherein the liquid storage tank is provided with a dirty liquid area and a clean liquid area, the dirty liquid area is separated from the clean liquid area by a first partition plate, the dirty liquid area is connected with the inlet of the filter tank, and the clean liquid area is connected with the outlet of the filter tank.

[0011] The grinding liquid in the dirty liquid area enters the filter tank for filtration, and the filtered grinding liquid enters the clean liquid area and is then conveyed to the machine table for use.

[0012] Preferably, the recovery liquid area is communicated with the dirty liquid area by a liquid recovery pump.

[0013] The centrifuged grinding liquid enters the dirty liquid area from the recovery liquid area through the liquid recovery pump.

[0014] Preferably, the recovery liquid area is provided with a stirring device for stirring the grinding liquid in the recovery liquid area, and the stirring device comprises a plurality of nozzles connected with an external air source and / or stirring blades.

[0015] The provision of the stirring device can fully stir the grinding liquid mixed with solid particles at a high concentration, so that the solid particles are prevented from depositing at the bottom of the recovery liquid area.

[0016] Preferably, the recovery liquid area is provided with a liquid level meter for monitoring the liquid level in the recovery liquid area.

[0017] The provision of the liquid level meter can facilitate the operator to monitor the liquid level in the recovery liquid area in real time, so that the equipment is prevented from being damaged due to idling caused by insufficient grinding liquid.

[0018] Preferably, the recovery liquid area is provided with a submersible pump, and the submersible pump supplies liquid to the centrifuge.

[0019] Preferably, the filter tank is provided with a back flushing port on the liquid outlet, and the back flushing port is connected with an external compressed air source.

[0020] The provision of the back flushing port is used for back flushing the filter tank by the external compressed air source, so that the solid particles accumulated on the outer surface of the filter element and the inner wall of the filter tank are blown down and enter the recovery liquid area along the blowdown pipe.

[0021] Preferably, the centrifugal device further comprises a PLC controller, and the PLC controller is electrically connected with the precision filtration device and the centrifugal device.

[0022] The PLC controller controls the start and stop of the precision filtration device and the centrifugal device, so that the automation degree and the precision of control are improved.

[0023] Advantages: compared with the prior art, the centrifugal device has the following advantages:

[0024] This invention combines a precision filtration device and a centrifugal device, solving the problem that precision filtration devices cannot effectively handle high-concentration mixtures when used to filter grinding fluid. At the same time, it makes up for the incomplete separation of solid particles in low-concentration grinding fluid when relying solely on a centrifugal device as a filtration device, thus achieving more efficient filtration of grinding fluid. Attached Figure Description

[0025] Fig. 1 This is a front sectional view of the present invention.

[0026] Fig. 2 This is a partially enlarged view of the front sectional view of this utility model.

[0027] The components include: 1. Filter tank; 2. Drain pipe; 3. Recovery liquid area; 4. Centrifuge; 5. Dirty liquid area; 6. Clean liquid area; 7. Baffle; 8. Return liquid pump; 9. Level gauge; 10. Submersible pump; 11. Backflush port; 12. PLC controller; 13. Filter pump; 14. Nozzle. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0029] Example 1:

[0030] See appendix Figs. 1-2 Figure shows a grinding fluid treatment system combining precision filtration and centrifugal filtration, which includes a precision filtration device and a centrifugal device. The precision filtration device includes a filter tank 1, which is connected to the recovery liquid area 3 through a drain pipe 2. The centrifugal device includes a centrifuge 4, whose inlet and outlet are both connected to the recovery liquid area 3.

[0031] In this embodiment, a liquid storage tank is also provided, which contains a dirty liquid area 5 and a clean liquid area 6. The dirty liquid area 5 and the clean liquid area 6 are separated by a partition 7. The dirty liquid area 5 is connected to the inlet of the filter tank 1, and the clean liquid area 6 is connected to the outlet of the filter tank 1. The grinding fluid in the dirty liquid area 5 enters the filter tank 1 for filtration. After filtration, the grinding fluid enters the clean liquid area 6 and is then transported to the machine for use.

[0032] In this embodiment, the recovery liquid zone 3 is connected to the dirty liquid zone 5 through the return liquid pump 8, and the grinding fluid after centrifugation enters the dirty liquid zone from the recovery liquid zone 3 through the return liquid pump 8.

[0033] In this embodiment, a stirring device for agitating the grinding fluid in the recovery liquid zone 3 is provided in the recovery liquid zone 3. The stirring device uses multiple nozzles 14 connected to an external air source. Gas is sprayed into the recovery liquid zone 3 through the nozzles 14 to agitate the grinding fluid in the recovery liquid zone 3 and prevent solid particles from depositing.

[0034] In the embodiment, the recovery liquid area 3 is provided with a liquid level meter 9 for monitoring the liquid level in the recovery liquid area 3. The liquid level meter 9 can facilitate the operator to monitor the liquid level in the recovery liquid area 3 in real time, preventing the equipment from being damaged due to insufficient grinding fluid.

[0035] In the embodiment, the recovery liquid area 3 is provided with a submersible pump 10, which provides grinding fluid to the centrifuge 4 for centrifugal operation.

[0036] In the embodiment, the filter tank 1 is provided with a back flushing port 11 on the liquid outlet. The back flushing port 11 is connected to an external compressed air source. The back flushing port 11 is used to back flush the filter tank 1 by the external compressed air source, blowing the solid particles accumulated on the outer surface of the filter element and the inner wall of the filter tank 1 into the recovery liquid area 3 along the blowdown pipe 2.

[0037] In the embodiment, a PLC controller 12 is also provided. The PLC controller 12 is electrically connected to the precision filtration device and the centrifugal device. The PLC controller 12 controls the start and stop of the precision filtration device and the centrifugal device, improving the automation and accuracy of the control.

[0038] Embodiment 2:

[0039] When the present application is in operation, the grinding fluid flows from the machine table into the dirty liquid area 5 of the liquid storage tank after use. Under the action of the filter pump 13, the grinding fluid is transported into the filter tank 1. After the grinding fluid enters the tank body from the bottom of the filter tank 1, the solid particles in the grinding fluid are blocked outside the filter element under the action of the filter element. The clean grinding fluid is discharged from the center of the filter element to the top end of the filter tank 1, and finally flows into the clean liquid area 5. The clean grinding fluid in the clean liquid area 5 is used by the machine table.

[0040] After the grinding fluid is filtered and circulated for several times, a large amount of solid particles will accumulate on the surface of the filter element and in the filter tank 1. These solid particles seriously affect the flow capacity of the filter tank 1. At this time, the filter tank 1 needs to be cleaned. The back flushing port 11 is connected to the compressed air. The high concentration grinding fluid in the filter tank 1 is emptied. Specifically, the filter pump 13 stops the liquid inlet. The compressed air enters the filter tank 1 from the back flushing port 11. Under the action of the compressed air, all the high concentration grinding fluid with solid particles in the filter tank 1 is emptied downward.

[0041] At this time, the high concentration grinding fluid is discharged from the lower end of the filter tank 1, flows into the recovery liquid area 3 through the drain pipe 2, and the liquid level meter 9 detects that the recovery liquid area 3 has a certain liquid level, so as to allow the submersible pump 10 to work, and the grinding fluid is transported into the centrifuge 4. The centrifuge 4 works, and under the action of centrifugation, solid particles are pressed to the drum wall, and liquid flows out of the liquid outlet of the centrifuge 4 and flows back to the recovery liquid area 3. The high concentration grinding fluid in the recovery liquid area 3 is continuously filtered and collected by the centrifuge 4.

[0042] When the submersible pump 10 works, the nozzle 14 sprays high-pressure air into the recovery liquid area 3, so that the high concentration grinding fluid is fully stirred. Since the concentration of the grinding fluid in the recovery liquid area 3 is very high, the high-pressure air is introduced to prevent a large amount of solid impurities from depositing at the bottom of the recovery liquid area 3.

[0043] The high concentration grinding fluid in the recovery liquid area 3 is continuously diluted under the action of the centrifuge 4, a large amount of solid particles are effectively separated out, and the purified grinding fluid reenters the dirty liquid area 5 through the liquid return pump 8. After being filtered by the filter tank 1, the grinding fluid can be used for grinding again.

[0044] The above embodiments only exemplarily illustrate the principle and effect of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A precision filtration and centrifugal filtration combined grinding fluid treatment system, characterized by: The precision filtering device and the centrifugal device are both communicated with the recovery liquid area; The precision filtering device comprises a filtering tank, which is communicated with the recovery liquid area through a blowdown pipe; The centrifugal device comprises a centrifugal machine, and the liquid inlet and the liquid outlet of the centrifugal machine are both communicated with the recovery liquid area.

2. The grinding fluid treatment system of claim 1, wherein: The liquid storage tank is internally provided with a dirty liquid area and a clean liquid area, the dirty liquid area and the clean liquid area are separated by a first partition, the dirty liquid area is connected with the inlet of the filtering tank, and the clean liquid area is connected with the outlet of the filtering tank.

3. The grinding fluid treatment system of claim 2, wherein: The recovery liquid area is communicated with the dirty liquid area through a liquid recovery pump.

4. The grinding fluid treatment system of claim 1, wherein: The recovery liquid area is internally provided with a stirring device for stirring the grinding fluid in the recovery liquid area, and the stirring device comprises a plurality of nozzles connected with an external air source and / or stirring blades.

5. The grinding fluid treatment system of claim 1, wherein: The recovery liquid area is internally provided with a liquid level meter for monitoring the liquid level in the recovery liquid area.

6. The grinding fluid treatment system of claim 1, wherein: The recovery liquid area is internally provided with a submersible pump, which supplies liquid to the centrifugal machine.

7. The grinding fluid treatment system of claim 1, wherein: The liquid outlet of the filtering tank is provided with a back flushing port, which is connected with an external compressed air source.

8. The grinding fluid treatment system of claim 1, wherein: The device further comprises a PLC controller, which is electrically connected with the precision filtering device and the centrifugal device.

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