Centrifugal filtration system integrated with high-pressure center water outlet function and use method

Abstract

The invention belongs to the technical field of filtering equipment, and particularly discloses a centrifugal filtering system integrated with a high-pressure center water outlet function, which comprises a water tank and a centrifugal separator, the centrifugal separator is used for primary filtration and is connected with the water tank through a bracket; the water tank comprises four functional areas, namely a liquid inlet area, a refrigerating area, a precise filtering area and a liquid supply area; a liquid inlet pipeline, a liquid return pipeline and a bag type filtering assembly which are connected with the centrifugal separator are arranged in the liquid inlet area; a cutting fluid refrigerating machine is arranged in the refrigerating area; a liquid supply pump assembly and a precision filtering assembly are arranged in the precision filtering area; and an annular spraying cooling pump assembly and a pressurizing unit are arranged in the liquid supply area. The invention further discloses a using method based on the centrifugal filtering system, the centrifugal filtering system is suitable for a machine tool to conduct non-metal grinding machining under the condition of total synthesis cutting fluid, low-pressure external cooling cutting fluid can be provided for the machine tool for conventional machining, and high-pressure center internal cooling cutting fluid can be provided for machining of structures such as long and deep holes. And the equipment cost is effectively reduced, resources are fully utilized, the integration level is high, and the application range is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering equipment and relates to a centrifugal filtering system with integrated high-pressure central water outlet function and a use method thereof. Background Art

[0002] When grinding non-metallic brittle materials such as glass, ceramics, and silicon, the machine tool will generate a lot of heat and powder chips. A special filtration system is needed to provide the required clean constant temperature cutting fluid for the grinding of the machine tool, which is used for tool cooling, waste chip washing, etc. At the same time, it is necessary to filter and cool the chip-containing cutting fluid generated during the processing to achieve cutting fluid circulation and powder chip collection. Due to the particularity of non-metallic brittle materials, they have the characteristics of low density, non-magneticity, and high hardness. In addition, for grinding, the particle size of powder chips is very small, most of which are within 100μm. Conventional filters cannot be effectively filtered. Therefore, compared with metal material processing, the design of a special filtration system for grinding non-metallic brittle materials will be more difficult and the price is high. Especially imported special filtration systems of this type are even more expensive. However, if the machine tool is not equipped with a suitable special filtration system, there will be problems such as scratching the surface of parts, substandard processing accuracy, damage to key components in the machine tool, and shortening the service life of the machine tool.

[0003] There are currently two filtration system solutions on the market for this type of processing: one is centralized filtration of multiple grinding machine tools. Centralized filtration stations are mostly used in combination with sedimentation tanks, centrifugal separators, precision filters, etc., which occupy a large area and are suitable for workshop-level machine tools. The second is the combination of ordinary water tanks and centrifugal separators. The centrifugal separator is used as the main filter to filter the cutting fluid. It is suitable for single-machine matching. However, because the centrifugal separator is a physical filter, not an absolute filter, when the grinding process requires high precision, there will still be problems such as scratches on the surface of parts and substandard processing precision. These two solutions are only applicable to machine tools that use ring spray external cooling to cool the cutting fluid.

[0004] As the complexity of the structure of the processed parts increases, when the machine tool is processing long and deep holes, spherical surfaces, deep cavities and other structures, in addition to the need for external cooling by ring spray, it is also necessary to use the internal cooling method of high-pressure central water outlet for cutting fluid cooling. Because the high-pressure central water outlet has very high requirements on the type of cutting fluid and the filtering accuracy of the cutting fluid, the above two solutions cannot realize the integrated high-pressure central water outlet function. Since non-metallic grinding generally uses fully synthetic cutting fluids that do not contain mineral oil, and conventional high-pressure pumps are not suitable, there is no dedicated filtration system with integrated high-pressure central water outlet function for non-metallic grinding on the market, so many customers will divide conventional structural grinding and long and deep hole structural processing into two machine tools for processing separately. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a centrifugal filtration system with integrated high-pressure central water outlet function and a method of use, which solves the problem that a stand-alone non-metallic grinding processing special filtration system cannot have both the functions of ring spray external cooling and high-pressure central water outlet internal cooling.

[0006] The present invention is achieved through the following technical solutions: A centrifugal filtration system with integrated high-pressure central water outlet function comprises a water tank and a centrifugal separator. The centrifugal separator is connected to the water tank through a bracket. The water tank comprises four interconnected functional areas: a liquid inlet area, a refrigeration area, a precision filtration area, and a liquid supply area. The liquid inlet area is provided with a bag filter assembly, a liquid return port pipeline, and a liquid inlet I pipeline; the refrigeration area is provided with a cutting fluid refrigerator; the precision filtration area is provided with a liquid supply pump assembly and a precision filtration assembly; the liquid supply area is provided with a booster unit and a ring spray cooling pump assembly.

[0007] Furthermore, the inlet of the liquid inlet I pipeline is connected to the front-end cutting fluid tank sewage pump I, the outlet of the liquid inlet I pipeline is connected to the liquid inlet of the centrifuge, the centrifuge return port and the return port pipeline inlet are connected through a flange, and the return port pipeline outlet is connected to the water tank.

[0008] Furthermore, the inlet of the bag filter assembly is connected to the sewage pump II of the front cutting fluid tank, and the outlet of the bag filter assembly is connected to the water tank; the bag filter assembly is used as a backup filtration liquid path of the centrifugal separator, and when the centrifugal separator is in a cleaning mode or fails, the system automatically switches to the bag filter assembly for filtration; Furthermore, the bag filter assembly includes a bag filter, a three-way ball valve, a straight water tank pipeline, a pressure sensor I, and a liquid inlet pipeline II; the inlet of the liquid inlet pipeline II is connected to the sewage pump II of the front cutting fluid tank, and the outlet of the liquid inlet pipeline II is connected to the bag filter inlet and the straight water tank pipeline inlet through the three-way ball valve respectively; the straight water tank pipeline is connected to the water tank; the pressure sensor I is arranged on the bag filter inlet.

[0009] Furthermore, the inlet of the liquid supply pump assembly is connected to the water tank, the outlet of the liquid supply pump assembly is connected to the inlet of the precision filtration assembly, the outlet of the precision filtration assembly is connected to the inlet of the boosting unit, and the overflow structure II of the boosting unit is connected to the water tank; the precision filtration assembly is fixed on the support frame outside the water tank.

[0010] Further, the booster unit includes a high-pressure pump assembly, a liquid level sensor, an upper liquid tank, and a mounting plate. The upper liquid tank is arranged on the water tank, the mounting plate is arranged on the upper liquid tank, the high-pressure pump assembly and the liquid level sensor are arranged on the mounting plate, the booster unit inlet is arranged on the side of the upper liquid tank, an overflow structure II is arranged inside the upper liquid tank, and the overflow structure II is connected to the water tank; Furthermore, the high-pressure pump assembly includes a high-pressure pump, an overflow valve, a pressure regulating handle, a pressure sensor II, a flow sensor II, an overflow pipeline and a high-pressure pipeline; an overflow valve is provided at the outlet of the high-pressure pump, and an overflow pipeline, a high-pressure pipeline and a pressure regulating handle are provided on the overflow valve, the overflow pipeline outlet is connected to the liquid inlet area, and a pressure sensor II and a flow sensor II are provided on the high-pressure pipeline, and the high-pressure pipeline outlet and the inlet of the water outlet spindle of the machine tool center are connected by a high-pressure resistant rubber tube.

[0011] Furthermore, the inlet of the annular spray cooling pump assembly is communicated with the water tank, and the outlet of the annular spray cooling pump assembly is connected with the annular spray inlet of the machine tool.

[0012] Furthermore, an overflow structure I and a double overflow port are provided in the water tank. The overflow structure I is communicated with the double overflow port inlet, and the double overflow port outlet is connected with the front-end cutting fluid tank return port pipeline.

[0013] The present invention also discloses a method for using the centrifugal filtration system based on the integrated high-pressure central water outlet function, comprising the following steps: 1) The chip-containing cutting fluid discharged from the machine tool is pumped into the centrifugal separator through the front-end cutting fluid tank sewage pump I for primary filtration, and the cutting fluid after primary filtration flows into the water tank; after the centrifugal separator runs for a period of time, it stops filtering and enters the cleaning mode, and the system automatically switches to the spare bag filter assembly to perform primary filtration on the cutting fluid; after the centrifugal separator completes the cleaning mode, the system automatically switches back to the centrifugal separator to perform primary filtration on the cutting fluid; 2) The cutting fluid after primary filtration flows through the cutting fluid refrigerator for cooling. The cutting fluid after primary filtration and cooling flows to the precision filtration area and the liquid supply area respectively; 3) When the ring spray cooling pump assembly is started, the first-stage filtered and cooled cutting fluid is pumped into the machine tool ring spray to perform external cooling on the workpiece; 4) When the central water outlet function of the machine tool is started, the liquid supply pump assembly starts to pump the cutting fluid after primary filtration and cooling into the precision filtration assembly for secondary filtration, and the cutting fluid after secondary filtration and cooling flows into the booster unit; the liquid level sensor on the booster unit monitors the liquid level in real time. When the liquid level is higher than the low liquid level value, the high-pressure pump starts to boost the cutting fluid after secondary filtration and cooling, and pump it into the central water outlet spindle of the machine tool to perform high-pressure internal cooling on the workpiece; The liquid level sensor monitors the liquid level in real time. When the liquid level is higher than the low liquid level value, the high-pressure pump is running to prevent the high-pressure pump from running without water and the machine tool from processing without water. The high-pressure pump must be a coated high-pressure pump with a surface hardness of more than 2000HV, which is higher than the hardness of non-metallic materials. It has high hardness, high wear resistance and corrosion resistance and is suitable for non-metallic grinding processing with fully synthetic cutting fluids. The filtration accuracy of the precision filter component must be no less than 10μm to ensure that the high-pressure pump and the center water outlet spindle of the machine tool can be used normally during non-metallic grinding processing. The precision filter is a filter element filter specially used to filter grinding powder. According to the actual processing technology, the high-pressure pump and the ring spray cooling pump can be turned on separately or simultaneously, so that two cutting fluid cooling methods of high-pressure center internal cooling and ring spray external cooling required for non-metallic grinding processing can be achieved on one machine tool.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention solves the problem of discontinuous production caused by filter blockage, failure, etc. in conventional filter systems by arranging a bag filter assembly as a spare filter liquid path for the centrifuge; when the centrifuge is in a cleaning mode or fails, the system automatically switches to the bag filter assembly for primary filtration; after the centrifuge completes the cleaning mode or the failure is resolved, the system automatically switches back to the centrifuge for primary filtration, thereby achieving the continuity of the cutting fluid circulation and ensuring that the machine tool can process without stopping for a long time.

[0015] The present invention completely isolates the cutting fluid after two-stage filtration and cooling from the cutting fluid in the water tank area by arranging a booster unit, and has different filtration precisions at the physical level, thereby realizing the high cleanliness requirement of the cutting fluid for the central water outlet function of the machine tool; the booster unit solves the problem that conventional high-pressure pumps cannot be used for fully synthetic cutting fluid processing by being provided with a coated high-pressure pump, thereby realizing the high-pressure cutting fluid requirement of the central water outlet function of the machine tool; by continuously outputting high-pressure, high-precision, constant temperature cutting fluid, it is ensured that the machine tool has two cutting fluid cooling methods of high-pressure central internal cooling and ring spray external cooling required for non-metallic grinding processing.

[0016] In summary, the centrifugal filtration system and the method of use of the present invention have complete functions, high integration, novel structural design, and a wide range of applications. When a machine tool is equipped with the centrifugal filtration system of the present invention, two cooling methods, namely, high-pressure center water outlet internal cooling and ring spray external cooling, can be provided for the machine tool during non-metallic grinding processing. One machine tool can complete the processing of two machine tools, effectively reducing the equipment cost and fully utilizing resources. The internal cooling method of high-pressure center water outlet can also effectively increase the tool life, shorten the processing time, and improve the processing yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the present invention; Figure 3 It is a schematic diagram of the bag filter assembly structure; Figure 4 is a schematic diagram of the boost unit structure; Figure 5 is a schematic cross-sectional view of the overflow structure II of the upper liquid tank; Figure 6 is a schematic cross-sectional view of the water tank overflow structure I; Figure 7 It is a system working principle diagram of the present invention; Among them: 1 is a centrifugal separator, 2 is a centrifugal separator liquid return port, 3 is a centrifugal separator liquid inlet, 4 is a liquid return port pipeline, 5 is a bracket, 6 is a liquid inlet I pipeline, 7 is a liquid inlet II pipeline, 8 is a double overflow port, 9 is a bag filter assembly, 10 is a high-pressure pipeline outlet, 11 is a ring spray cooling pipeline, 12 is a cutting fluid refrigerator, 13 is a water tank, 14 is a precision filter assembly, 15 is a liquid supply pump assembly, 16 is a float liquid level switch, 17 is an electric control box, 18 is a ring spray cooling pump assembly, 19 is a booster unit Element, 20 is a bag filter, 21 is a three-way ball valve, 22 is a straight water tank pipeline, 23 is a pressure sensor I, 24 is a liquid level sensor, 25 is a high-pressure pipeline, 26 is an upper liquid tank, 27 is a flow sensor II, 28 is a pressure sensor II, 29 is a pressure regulating handle, 30 is an overflow valve, 31 is a mounting plate, 32 is a high-pressure pump, 33 is an overflow pipeline, 34 is an overflow structure I, 35 is an overflow structure II, 36 is a liquid inlet area, 37 is a refrigeration area, 38 is a precision filtration area, and 39 is a liquid supply area. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1~2 As shown, the present invention discloses a centrifugal filtration system with integrated high-pressure central water outlet function, including a centrifugal separator 1, a water tank 13, a bag filter assembly 9, a cutting fluid refrigerator 12, a precision filter assembly 14, a liquid supply pump assembly 15, a booster unit 19, and a ring spray cooling pump assembly 18.

[0019] The water tank 13 is divided into four functional areas, namely, a liquid inlet area 36, ​​a refrigeration area 37, a precision filtration area 38, and a liquid supply area 39. The liquid inlet area 36 is used to set up the bag filter assembly 9, the return liquid pipe 4, and the liquid inlet I pipe 6; the refrigeration area 37 is used to set up the cutting fluid refrigerator 12; the precision filtration area 38 is used to set up the liquid supply pump assembly 15 and the precision filtration assembly 14; and the liquid supply area 39 is used to set up the booster unit 19 and the ring spray cooling pump assembly 18.

[0020] The external device of the present invention is described by taking a machine tool as an example.

[0021] The centrifugal separator 1 is the primary filter of the centrifugal filtration system of the present invention, and adopts high-speed centrifugal separation to perform automatic chip removal filtration, and is connected to the water tank 13 through the bracket 5; the centrifugal separator liquid inlet 3 is connected to the outlet of the liquid inlet I pipeline 6, and the inlet of the liquid inlet I pipeline 6 is connected to the outlet of the sewage pump I of the front cutting fluid tank; when the centrifugal filtration system is running, the sewage pump I supplies the chip-containing cutting fluid to the centrifugal separator 1 through the liquid inlet I pipeline 6; the centrifugal separator liquid return port 2 is connected to the inlet of the liquid return port pipeline 4, and the outlet of the liquid return port pipeline 4 is directly connected to the water tank 13.

[0022] Preferably, the bag filter assembly 9 is a backup filter liquid circuit for the centrifuge 1. When the centrifuge 1 switches to the cleaning mode, the system automatically switches to the bag filter assembly 9 for filtering. After the centrifuge 1 completes the cleaning mode, it automatically switches back to the centrifuge 1 for filtering. The backup and backup filter liquid circuit design can achieve the continuity of the cutting fluid circulation, providing a guarantee for the machine tool to operate without stopping for a long time.

[0023] The bag filter assembly 9 includes a bag filter 20, a three-way ball valve 21, a straight water tank pipeline 22, a pressure sensor I 23, and a liquid inlet II pipeline 7. Figure 3 As shown; the outlet of the liquid inlet II pipeline 7 is connected to the inlet of the bag filter 20 and the inlet of the direct water tank pipeline 22 respectively through the three-way ball valve 21, and the pressure sensor I 23 is arranged on the inlet pipeline of the bag filter 20; the bag filter 20 is connected to the water tank 13, the direct water tank pipeline 22 is connected to the water tank 13, and the inlet of the liquid inlet II pipeline 7 is connected to the outlet of the sewage pump II of the front cutting fluid tank.

[0024] Preferably, the straight water tank pipeline 22 is a backup liquid circuit for the bag filter 20. When the bag filter 20 is clogged during filtering, the pressure sensor I 23 gives a warning, and the three-way ball valve 21 is manually switched to allow the cutting fluid to flow into the water tank 13 through the straight water tank pipeline 22. The clogged filter bag can be replaced during system operation. After the replacement is completed, the three-way ball valve 21 is manually switched back to filter the bag filter 20. The backup and one-for-one liquid circuit design can also achieve the continuity of the cutting fluid circulation, providing a guarantee for long-term non-stop machining of the machine tool.

[0025] The cutting fluid refrigerator 12, the float level switch 16, and the electric control box 17 are arranged on the cover plate of the refrigeration zone 37. The cutting fluid after primary filtration flows through the cutting fluid refrigerator 12 along the internal flow channel of the water tank 13 for cooling. Figure 2 As shown by the arrow; when the liquid level in the water tank reaches a low level, the float level switch 16 feeds back an alarm signal to the machine tool to prompt an alarm.

[0026] The outlet of the liquid supply pump assembly 15 is connected to the inlet of the precision filter assembly 14; the outlet of the precision filter assembly 14 is connected to the booster unit 19; the precision filter assembly 14 is fixed on the water tank 13, and pressure gauges are respectively provided on the inlet and outlet pipelines of the precision filter assembly 14, and the blockage condition of the precision filter element can be judged by the pressure difference.

[0027] Preferably, the precision filter adopts a filter element type filter specially used for filtering grinding powder, which has a large dirt holding capacity and is not easy to be clogged. The combination of consumable-free filtration of the centrifuge 1 and consumable filtration of the precision filter assembly 14 can extend the service life of the precision filter element.

[0028] The booster unit 19 is built into the water tank 13. The booster unit 19 includes a high-pressure pump assembly, a liquid level sensor 24, an upper liquid tank 26, and a mounting plate 31. Figure 4 As shown; the upper liquid tank 26 is arranged on the water tank 13, the mounting plate 31 is arranged on the upper liquid tank 26, the high-pressure pump assembly and the liquid level sensor 24 are arranged on the mounting plate 31, the inlet of the booster unit 19 is arranged on the side of the upper liquid tank 26, and the upper liquid tank 26 is provided with an overflow structure II 35 inside, and the overflow structure II 35 is connected to the water tank 13, as shown Figure 5 shown.

[0029] Preferably, the boost unit 19 serves as an independent space, separated from the cutting fluid in the water tank 13, to form cutting fluid areas with different filtration precisions, ensuring that the high-pressure central water outlet is the cutting fluid filtered with absolute high precision; the liquid level is monitored in real time by the liquid level sensor 24, and the high-pressure pump 32 is started only when the liquid level is higher than the low liquid level value, to avoid the high-pressure pump 32 running without water and causing damage to the high-pressure pump 32; an overflow structure II 35 is provided inside the upper liquid tank 26 to prevent the cutting fluid from overflowing due to excessive liquid supply from the liquid supply pump.

[0030] The high-pressure pump assembly includes a high-pressure pump 32, an overflow valve 30, a pressure regulating handle 29, a pressure sensor II 28, a flow sensor II 27, an overflow pipeline 33, and a high-pressure pipeline 25; an overflow valve 30 is provided at the outlet of the high-pressure pump 32, and the overflow valve 30 is provided with an overflow pipeline 33, a high-pressure pipeline 25 and a pressure regulating handle 29, and the pressure regulating handle 29 is used to adjust the pressure of the cutting fluid output by the high-pressure pump 32; the outlet of the overflow pipeline 33 is connected to the liquid inlet area 36; the high-pressure pipeline 25 is provided with a pressure sensor II 28 and a flow sensor II 27, which are used to monitor the pressure and flow of the high-pressure cutting fluid; the high-pressure pipeline outlet 10 and the inlet of the water outlet spindle of the machine tool center are connected by a high-pressure resistant rubber tube.

[0031] Preferably, the high-pressure pump 32 is a coated high-pressure pump with a surface hardness of more than 2000 HV, which is higher than the hardness of non-metallic powder chips, and has high hardness, high wear resistance and corrosion resistance, and is suitable for non-metallic grinding processing of machine tools under the condition of fully synthetic cutting fluid without mineral oil; the outlet of the overflow pipeline 33 is connected to the liquid inlet area 36, ​​and the heated cutting fluid overflowed from the high-pressure pump 32 flows back to the liquid inlet area 36, ​​and then flows through the cutting fluid refrigerator 12 for cooling, ensuring constant temperature control, and does not affect the temperature of the cutting fluid sucked into other functional pumps; the high-pressure pipeline 25 of the high-pressure pump 32 A pressure sensor Ⅱ28 and a flow sensor Ⅱ27 are provided to ensure that the high-pressure clean cutting fluid pumped into the machine tool by the high-pressure pump 32 is within the normal use range of the machine tool; the flow sensor Ⅱ27 is provided with a low flow alarm for real-time monitoring of the high-pressure center water outlet flow to prevent the machine tool from processing without water, and the pressure sensor Ⅱ28 is provided with high-pressure and low-pressure alarms for real-time monitoring of the high-pressure center water outlet pressure to avoid the cutting fluid pressure being too high to exceed the upper pressure limit of the center water outlet spindle of the machine tool, and the cutting fluid pressure being too low to reach the lower pressure limit of the center water outlet spindle of the machine tool.

[0032] The annular spray cooling pump assembly 18 comprises an annular spray cooling pump and an annular spray cooling pipeline 11, and the outlet of the annular spray cooling pipeline 11 is connected to the annular spray inlet pipeline of the machine tool.

[0033] The water tank 13 is provided with an overflow structure I34 and a double overflow port 8, such as Figure 6 As shown, combined with the experience of fluid simulation and actual application in non-metallic grinding processing, the distance from the upper end surface of the overflow structure to the upper surface of the liquid tank body is ≥80mm, which is used to contain bubbles, eliminate bubbles, and prevent overflow; the lower edge of the double overflow port 8 is flush with the inner bottom surface of the overflow structure Ⅰ34, which is used to ensure that the cutting fluid can flow back to the front cutting fluid tank in time to prevent foam and cutting fluid overflow.

[0034] The working process of the present invention is as follows: When the machine tool performs non-metallic grinding, the cutting fluid will take away the heat and powder chips generated by the processing. After the chip-containing cutting fluid is discharged from the machine tool, it flows into the front-end cutting fluid tank. The sewage pump Ⅰ on the front-end cutting fluid tank pumps the cutting fluid into the centrifugal separator 1 for centrifugal separation and filtration. After the first-level filtration of the centrifugal separator 1, the cutting fluid flows into the water tank 13; the cutting fluid flows along the internal flow channel of the water tank 13 through the cutting fluid refrigerator 12 for cooling, and the cutting fluid after the first-level filtration and cooling flows to the precision filtration area 38 and the liquid supply area 39 respectively.

[0035] When the machine tool starts the annular spray external cooling function for processing, the annular spray cooling pump assembly 18 is started to pump the cutting fluid after primary filtration and cooling into the machine tool annular spray to perform external cooling on the workpiece.

[0036] When the machine tool starts the high-pressure central water outlet function for processing, the liquid supply pump assembly 15 starts, and the cutting fluid after primary filtration and cooling is pumped into the precision filtration assembly 14 for secondary filtration. The cutting fluid after secondary filtration flows into the booster unit 19, and the liquid level sensor 24 starts to monitor the liquid level height in the booster unit 19. When the liquid level is higher than the low liquid level value, the high-pressure pump 32 starts to boost the cutting fluid after secondary filtration and cooling, and pump it into the central water outlet spindle of the machine tool for high-pressure central internal cooling; when the high-pressure pump 32 is running, the pressure regulating handle 29 is adjusted to output the cutting fluid pressure required for processing, and the excess cutting fluid flows back to the water tank 13 through the overflow pipe 33; when the high-pressure pump 32 is running, the pressure sensor II 28 and the flow sensor II 27 monitor the flow and pressure of the cutting fluid in real time, and when the set alarm value is exceeded, the signal will be fed back to the machine tool for alarm.

[0037] After the centrifuge 1 runs for a period of time, it reaches the set cleaning cycle, the sewage pump I on the front cutting fluid tank stops, the sewage pump II starts, and the system automatically switches to the bag filter assembly 9 for filtering; the centrifuge 1 starts the automatic cleaning mode, and after the cleaning is completed, the system automatically switches back to the centrifuge 1 for centrifugal filtration; when the bag filter assembly 9 is filtering, when the filter bag of the bag filter 20 is blocked, the pressure sensor I 23 feeds back the alarm signal to the machine tool for prompting the alarm, and manually switches the three-way ball valve 21 to allow the cutting fluid to flow into the water tank 13 through the straight water tank pipeline 22. The blocked filter bag is replaced during system operation. After the replacement is completed, it is manually switched back to the three-way ball valve 21, and the bag filter 20 is continued to be used for filtering to ensure the continuity of the cutting fluid circulation and provide protection for the machine tool to process without stopping for a long time.

[0038] According to the actual processing technology, the machine tool can start the ring spray external cooling and the high-pressure center internal cooling separately or simultaneously for processing cooling and flushing; the powder chips generated by the processing are separated and discharged through the centrifugal separator 1, the bag filter component 9, and the precision filter component 14.

[0039] The centrifugal filtration system of the present invention is a filtration system integrating high-pressure central water outlet function and annular spray external cooling function, including two-stage filtration, refrigeration and pressurization of cutting fluid, which can provide the machine tool with the annular spray external cooling cutting fluid required for ordinary processing, and can also provide the machine tool with the high-pressure central internal cooling cutting fluid required for the processing of long deep holes, spherical surfaces, deep cavities and other structures, which can meet the needs of the machine tool to perform non-metallic grinding processing under the condition of fully synthetic cutting fluid without mineral oil, and is also suitable for non-metallic grinding processing using emulsion and cutting oil. The machine tool is equipped with the centrifugal filtration system of the present invention, and can complete the processing of various structures of non-metallic material parts that require two machine tools on one machine tool.

Claims

1. A centrifugal filtration system with integrated high-pressure central water outlet function, characterized in that: The invention comprises a water tank (13) and a centrifugal separator (1). The centrifugal separator (1) is connected to the water tank (13) via a bracket (5). The water tank (13) comprises four functional areas, namely, a liquid inlet area (36), a refrigeration area (37), a precision filtration area (38), and a liquid supply area (39). The liquid inlet area (36) is provided with a bag filter assembly (9), a liquid return pipe (4), and a liquid inlet I pipe (6). The refrigeration area (37) is provided with a cutting fluid refrigerator (12). The precision filtration area (38) is provided with a liquid supply pump assembly (15) and a precision filtration assembly (14). The liquid supply area (39) is provided with a booster unit (19) and a ring spray cooling pump assembly (18).

2. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: The inlet of the liquid inlet pipe (6) is connected to the sewage pump I of the front cutting fluid tank, the outlet of the liquid inlet pipe (6) is connected to the liquid inlet (3) of the centrifugal separator, the liquid return port (2) of the centrifugal separator and the inlet of the liquid return pipe (4) are connected through a flange, and the outlet of the liquid return pipe (4) is connected to the water tank (13).

3. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: The inlet of the bag filter assembly (9) is connected to the sewage pump II of the front cutting fluid tank, and the outlet of the bag filter assembly (9) is connected to the water tank (13). The bag filter assembly (9) is used as a backup filtration liquid path of the centrifugal separator (1). When the centrifugal separator (1) is in a cleaning mode or fails, the system automatically switches to the bag filter assembly (9) for filtering.

4. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 3, characterized in that: The bag filter assembly (9) comprises a bag filter (20), a three-way ball valve (21), a straight water tank pipeline (22), a pressure sensor I (23), and a liquid inlet II pipeline (7); the inlet of the liquid inlet II pipeline (7) is connected to a sewage pump II of a front cutting fluid tank, and the outlet of the liquid inlet II pipeline (7) is connected to the inlet of the bag filter (20) and the inlet of the straight water tank pipeline (22) through the three-way ball valve (21), respectively; the straight water tank pipeline (22) is communicated with the water tank (13); and the pressure sensor I (23) is arranged on the inlet of the bag filter (20).

5. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: The inlet of the liquid supply pump assembly (15) is connected to the water tank (13), the outlet of the liquid supply pump assembly (15) is connected to the inlet of the precision filter assembly (14), the outlet of the precision filter assembly (14) is connected to the inlet of the booster unit (19), and the overflow structure II (35) of the booster unit (19) is connected to the water tank (13); the precision filter assembly (14) is fixed to the outer support frame of the water tank (13).

6. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: The booster unit (19) comprises a high-pressure pump assembly, a liquid level sensor (24), an upper liquid tank (26), and a mounting plate (31); the upper liquid tank (26) is arranged on the water tank (13); the mounting plate (31) is arranged on the upper liquid tank (26); the high-pressure pump assembly and the liquid level sensor (24) are arranged on the mounting plate (31); an inlet of the booster unit (19) is arranged on a side of the upper liquid tank (26); an overflow structure II (35) is arranged inside the upper liquid tank (26); and the overflow structure II (35) is in communication with the water tank (13).

7. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 6, characterized in that: The high-pressure pump assembly comprises a high-pressure pump (32), an overflow valve (30), a pressure regulating handle (29), a pressure sensor II (28), a flow sensor II (27), an overflow pipeline (33) and a high-pressure pipeline (25); the high-pressure pump (32) is provided with an overflow valve (30) at its outlet, the overflow valve (30) is provided with an overflow pipeline (33), a high-pressure pipeline (25) and a pressure regulating handle (29), the overflow pipeline (33) outlet is connected to a liquid inlet area (36), the high-pressure pipeline (25) is provided with a pressure sensor II (28) and a flow sensor II (27), and the high-pressure pipeline (25) outlet is connected to an inlet of a water outlet spindle of a machine tool center through a high-pressure resistant rubber tube.

8. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: The inlet of the annular spray cooling pump assembly (18) is communicated with the water tank (13), and the outlet of the annular spray cooling pump assembly (18) is connected with the annular spray inlet of the machine tool.

9. The centrifugal filtration system with integrated high-pressure central water outlet function according to claim 1, characterized in that: An overflow structure I (34) and a double overflow port (8) are provided in the water tank (13); the overflow structure I (34) is connected to the inlet of the double overflow port (8); and the outlet of the double overflow port (8) is connected to a liquid return port pipeline of a front-end cutting fluid tank.

10. A method for using the centrifugal filtration system with integrated high-pressure central water outlet function according to any one of claims 1 to 9, comprising the following steps: 1) The chip-containing cutting fluid discharged from the machine tool is pumped into the centrifugal separator (1) through the front-end cutting fluid tank sewage pump I for primary filtration, and the cutting fluid after primary filtration flows into the water tank (13); after the centrifugal separator (1) runs for a period of time, the filtering stops and enters the cleaning mode, and the system automatically switches to the spare bag filter assembly (9) to perform primary filtration on the cutting fluid; after the centrifugal separator (1) completes the cleaning mode, the system automatically switches back to the centrifugal separator (1) to perform primary filtration on the cutting fluid; 2) the cutting fluid after primary filtration flows through a cutting fluid refrigerator (12) for cooling, and the cutting fluid after primary filtration and cooling flows to a precision filtration area (38) and a liquid supply area (39) respectively; 3) When the annular spray cooling pump assembly (18) is started, the cutting fluid after primary filtration and cooling is pumped into the annular spray of the machine tool to perform external cooling on the workpiece; When the central water outlet function of the machine tool is started, the liquid supply pump assembly (15) is started to pump the cutting fluid after primary filtration and cooling into the precision filtration assembly (14) for secondary filtration, and the cutting fluid after secondary filtration and cooling flows into the booster unit (19); the liquid level sensor (24) on the booster unit (19) monitors the liquid level in real time, and when the liquid level is higher than the low liquid level value, the high-pressure pump (32) is started to boost the pressure of the cutting fluid after secondary filtration and cooling, and pump it into the central water outlet spindle of the machine tool to perform high-pressure internal cooling on the workpiece; According to the actual processing technology, the high-pressure pump (32) and the annular spray cooling pump can be turned on separately or simultaneously, so that two cutting fluid cooling methods of high-pressure center internal cooling and annular spray external cooling required for non-metal grinding processing can be realized on one machine tool.

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