Dry cleaning and low-temperature minimal quantity lubrication combined system and working method

Abstract

The invention discloses a dry-type cleaning and low-temperature minimal quantity lubrication combined system and a working method, solves the problem that in the prior art, workpiece lubrication and chip treatment are independently carried out, and has the beneficial effect of being convenient to operate. Comprising a liquid carbon dioxide bottle, a first-stage valve, a first valve and a cooling bin which are sequentially connected, part of liquid carbon dioxide is decompressed from the liquid carbon dioxide bottle through the first-stage valve to form gaseous carbon dioxide, and the liquid carbon dioxide and the gaseous carbon dioxide can flow towards the cooling bin through a pressure reducing valve after passing through the first valve or can be divided into two paths, one path directly flows to a heat exchange pipeline in the cooling bin, the other path passes through a pressure reducing valve and then is converted into gaseous carbon dioxide, the gaseous carbon dioxide flows into the cooling bin, and the gaseous carbon dioxide discharged from the cooling bin can enter an adjustable nozzle or a gas-liquid mixing nozzle after passing through a second valve.

Description

Technical Field

[0001] The invention relates to the field of milling fluid supply and chip cleaning in mechanical processing, in particular to a dry cleaning and low-temperature micro-lubrication combined system and a working method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Cryogenic Minimum Quantity Lubrication (CMQL) is an advanced processing technology that combines cryogenic cooling and minimal lubrication. It achieves efficient cooling and lubrication by using a combination of cryogenic media and minimal lubricating oil. This technology shows significant advantages in processing difficult-to-process materials, not only meeting the requirements of green manufacturing, but also significantly improving processing efficiency and workpiece surface quality.

[0004] Carbon dioxide dry cleaning technology is an environmentally friendly and efficient cleaning method that mainly uses the different physical states of carbon dioxide to remove surface pollutants. This technology is not only environmentally friendly, but also can effectively remove various types of pollutants. It is widely used in industries such as industry, electronics, and food processing.

[0005] Difficult-to-machine materials such as titanium alloys face multiple challenges during milling due to their unique physical properties. First, the low thermal conductivity of titanium alloys makes it difficult to dissipate the heat generated during the cutting process and easily accumulates in the cutting area, causing excessive wear and cracking of the tool and shortening the tool life. Secondly, the low elastic modulus of titanium alloys means that elastic deformation is easily generated during the processing process, resulting in burrs, especially when processing thin-walled or annular parts, which affects the processing accuracy and surface integrity. In addition, titanium alloys have a strong affinity with cutting tool materials, which easily leads to the accumulation of chips and entanglement on the tool, which not only hinders the cutting process, but may also cause tool damage. Titanium alloys are also prone to vibration during processing, which further affects cutting stability and processing quality.

[0006] In order to solve the above problems, the prior art uses carbon dioxide to clean the workpiece. For example, Chinese patent application number: CN201920035075.1 discloses a carbon dioxide snowflake cleaning system. The system maintains the pressure of the carbon dioxide entering the cleaning nozzle at 55-70 bar by connecting multiple carbon dioxide cylinders in parallel, and generates compressed gas through a compressed gas source to accelerate the ejection of carbon dioxide snowflake crystals formed when the liquid carbon dioxide is ejected. The disclosed technical solution requires another gas compression device to generate compressed gas to carry out the carbon dioxide snowflake crystals. The medium that carries the carbon dioxide snowflake crystals is different, and the formation method of the carbon dioxide snowflake crystals is also different.

[0007] In addition, the prior art also has a solution for lubricating the workpiece by mixing carbon dioxide and lubricating oil. Oil lubrication is used during the tool processing process. After the processing is completed, the supply of lubricating oil will be disconnected. However, there are chips on the surface of the workpiece at this time, which need to be processed in time. If not processed in time, subsequent processing will be affected. The prior art also uses other gas sources separately to process chips, but manual control is required, the response is not timely, and multiple gas sources need to be set up as a whole, which is difficult to operate. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a dry cleaning and low-temperature minimal lubrication combined system to solve the existing problems such as fluid supply and chip removal.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0010] A dry cleaning and low-temperature micro-lubrication combined system comprises a liquid carbon dioxide bottle, a primary valve, a first valve and a cooling chamber connected in sequence. Part of the liquid carbon dioxide is reduced in pressure from the liquid carbon dioxide bottle through the primary valve to form gaseous carbon dioxide. The liquid carbon dioxide and the gaseous carbon dioxide can flow toward the cooling chamber through the pressure reducing valve after passing through the first valve, or can be divided into two paths, one path directly flows to the heat exchange pipeline inside the cooling chamber, and the other path is converted into gaseous carbon dioxide after passing through the pressure reducing valve and flows to the inside of the cooling chamber. The temperature rises during the conversion to gaseous carbon dioxide. The liquid carbon dioxide discharged from the heat exchange pipeline of the cooling chamber enters an adjustable nozzle. The gaseous carbon dioxide discharged from the cooling chamber can enter the adjustable nozzle after passing through the second valve, or enter the gas-liquid mixing nozzle. The gaseous carbon dioxide entering the adjustable nozzle is mixed with the liquid carbon dioxide to perform dry cleaning on the workpiece, and the gaseous carbon dioxide entering the gas-liquid mixing nozzle is mixed with lubricating oil to perform low-temperature lubrication on the workpiece.

[0011] In a dry cleaning and low-temperature minimal lubrication combined system as described above, the first valve and the second valve are respectively connected to the control unit, and the control unit is connected to the milling machine control system to transmit the milling cutter cutting-in and cutting-out signals to the control unit. When the milling cutter cuts in, the gas-liquid mixing nozzle works and the adjustable nozzle is closed. When the milling cutter cuts out, the adjustable nozzle works and the gas-liquid mixing nozzle is closed.

[0012] In the dry cleaning and low-temperature minimal lubrication combined system as described above, when the milling cutter cuts in, the passage between the first valve and the heat exchange pipeline is closed, the passage between the first valve and the pressure reducing valve is opened, the passage between the second valve and the adjustable nozzle is closed, and the passage between the second valve and the gas-liquid mixing nozzle is opened.

[0013] In the dry cleaning and low-temperature micro-lubrication combined system as described above, when the milling cutter cuts out, the passages between the first valve and the heat exchange pipeline and the pressure reducing valve are opened, the passage between the second valve and the gas-liquid mixing nozzle is closed, and the passage between the second valve and the adjustable nozzle is opened.

[0014] A dry cleaning and low-temperature micro-lubrication combined system as described above, wherein the gas-liquid mixing nozzle is connected to a micro-lubricating oil pump, and the micro-lubricating oil pump is connected to the control unit, and the micro-lubricating oil pump can directly adjust the lubricant flow rate, reducing the use of additional valves;

[0015] The gas-liquid mixing nozzle and the adjustable nozzle are respectively arranged on both sides of the milling cutter, and the gas-liquid mixing nozzle and the adjustable nozzle are both arranged obliquely relative to the central axis of the milling cutter.

[0016] In the dry cleaning and low-temperature minimal lubrication combined system as described above, the heat exchange pipeline in the cooling bin is arranged in a spiral shape.

[0017] In the dry cleaning and low-temperature micro-lubrication combined system as described above, a flow meter is arranged between the cooling bin and the second valve, the flow meter is connected to the control unit, and the flow meter can adjust the flow and pressure of the cold air.

[0018] As described above, a dry cleaning and low-temperature minimal lubrication combined system, the first valve includes a shell, a carbon dioxide inlet is arranged on one side of the shell, a partition is arranged in the shell, the partition and the carbon dioxide inlet are set at a distance, the shell supports a rotating power source, the rotating power source is connected to the partition to drive the partition to rotate relative to the shell, the partition is provided with a fan-shaped area, the partition is provided with an arc hole on the peripheral side of the fan-shaped area, the shell is provided with a first outlet and a second outlet, and the arc hole is connected to at least one of the first outlet and the second outlet during the rotation of the partition.

[0019] In the dry cleaning and low-temperature minimal lubrication combined system as described above, the structure of the first valve is the same as that of the second valve, and the angle of the arc-shaped hole is greater than 180°.

[0020] In a second aspect, the present invention also provides a working method of a dry cleaning and low-temperature minimal lubrication combined system, including the following contents:

[0021] Liquid carbon dioxide is discharged from the liquid carbon dioxide bottle, and part of the liquid carbon dioxide is decompressed from the liquid carbon dioxide bottle through a primary valve to form gaseous carbon dioxide;

[0022] Liquid carbon dioxide and gaseous carbon dioxide pass through the first valve and then the pressure reducing valve, and then the liquid carbon dioxide is converted into gaseous carbon dioxide and flows into the cooling bin. During the conversion into gaseous carbon dioxide, the temperature rises, and the gaseous carbon dioxide enters the cooling bin. The gaseous carbon dioxide discharged from the cooling bin enters the second valve, and flows to the gas-liquid mixing nozzle through the second valve. The gaseous carbon dioxide entering the gas-liquid mixing nozzle is mixed with the lubricating oil to perform low-temperature lubrication on the workpiece.

[0023] Alternatively, liquid carbon dioxide and gaseous carbon dioxide are divided into two paths after passing through the first valve. One path flows directly to the heat exchange pipeline inside the cooling bin, and the other path is converted into gaseous carbon dioxide after passing through the pressure reducing valve and flows to the inside of the cooling bin. The temperature rises during the conversion into gaseous carbon dioxide. The liquid carbon dioxide discharged from the heat exchange pipeline of the cooling bin enters the adjustable nozzle, and the gaseous carbon dioxide discharged through the cooling bin enters the adjustable nozzle through the second valve. The gaseous carbon dioxide and liquid carbon dioxide entering the adjustable nozzle are mixed and then used to dry clean the workpiece.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1) The overall structure of the present invention is reasonably arranged. The arrangement of the cooling chamber, the first valve and the second valve can be used to connect with the adjustable nozzle and the gas-liquid mixing nozzle. Different functions are realized by using different states of carbon dioxide. The surface of the workpiece is lubricated by mixing gaseous carbon dioxide and lubricating oil. The low-temperature micro-lubrication part provides cooling and lubrication for the cutting area, taking away a large amount of cutting heat. The whole has the advantages of easy operation, reduced pollution, safe use and easy cleaning. The volume of high-pressure and low-temperature liquid carbon dioxide is rapidly expanded at the outlet to form dry ice particles. Under the impact of high-speed and low-temperature gaseous carbon dioxide, the dry ice particles are ejected at high speed. The low-temperature characteristics of the dry ice particles make the dirt cool and shrink rapidly, thereby destroying the adhesion between it and the processing surface. The dry ice particles ejected at high speed provide sufficient kinetic energy to crush or loosen the dirt. After the solid dry ice particles touch the dirt, they immediately sublimate into gaseous carbon dioxide and expand in volume by about 800 times, peeling the dirt from the processing surface and taking it away.

[0026] 2) In the present invention, dry cleaning and low-temperature lubrication use the same gas source, and use different states of the same medium respectively. The low-temperature gaseous carbon dioxide formed by decompressing liquid carbon dioxide is used to cool the carbon dioxide in the dry cleaning tube to maintain the liquid state. The pressure at the nozzle is rapidly reduced to form dry ice particles, which are carried out by high-speed low-temperature carbon dioxide gas. Liquid carbon dioxide is used as a supply source to avoid the use of additional air compressors, greatly reduce equipment costs and complexity, facilitate transportation, and reduce the risk of cold burns to operators due to transportation at ambient temperature during use.

[0027] 3) In the present invention, the first valve and the second valve are connected to the control unit, the control unit communicates with the milling machine control system, the milling cutter cutting-in and cutting-out signals are fed back to the control unit, and the control unit controls the opening of the corresponding pipelines of the first valve and the second valve according to the milling cutter cutting-in and cutting-out signals to realize different functions, and the structural setting is reasonable.

[0028] 4) In the present invention, the first valve and the second valve have reasonable structural settings. The first valve and the second valve are respectively provided with partitions, which are rotatable relative to the shell. The partition is provided with a fan-shaped area, and the partition is provided with an arc hole on the circumference of the fan-shaped area. The shell is provided with a first outlet and a second outlet. During the rotation of the partition, the arc hole can be connected to the first outlet and / or the second outlet, thereby realizing the opening of one outlet or two outlets of the first valve and realizing the opening of one outlet of the second valve.

[0029] 5) The present invention provides a system that can provide low-temperature carbon dioxide, which is suitable for high-speed processing of difficult-to-process materials such as titanium alloys; when the milling cutter cuts in, the system has a cooling and lubrication function; when the milling cutter cuts out, the system has a dry cleaning function to take away chips and impurities; the overall applicability is strong, and other gas sources can be easily replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 It is a front view of a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0032] Figure 2 The present invention Figure 1 A partial enlarged view of point A in the middle.

[0033] Figure 3 It is a schematic diagram of a first valve and a second valve in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0034] Figure 4It is a cross-sectional view of a first valve in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0035] Figure 5 It is a side cross-sectional view of a first valve in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0036] Figure 6 It is a cross-sectional view of a second valve in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0037] Figure 7 It is a side cross-sectional view of a second valve in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0038] Figure 8 It is a three-dimensional diagram of a cooling chamber in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0039] Fig. 9 It is a cross-sectional view of a cooling chamber in a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0040] Fig.10 It is a control flow chart of a dry cleaning and low-temperature minimal lubrication combined system according to one or more embodiments of the present invention.

[0041] Fig.11 This is the three-phase diagram for carbon dioxide.

[0042] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0043] Wherein: 1. Liquid carbon dioxide cylinder, 2. Cryogenic insulation pipe, 3. Primary valve, 4. First valve, 5. Pressure reducing valve, 6. Cooling chamber, 7. Mass flow meter, 8. Second valve, 9. Adjustable nozzle, 10. Gas-liquid mixing nozzle, 11. Micro lubricating oil pump, 12. Control unit, 13. Milling machine communication interface, 14. Cryogenic carbon dioxide inlet I, 15. Cryogenic carbon dioxide outlet II, 16. Cryogenic carbon dioxide outlet III, 17. Cryogenic carbon dioxide inlet IV, 18. Cryogenic carbon dioxide outlet V, 19. Cryogenic carbon dioxide outlet VI, 20. Cryogenic carbon dioxide inlet VI I, 21. Cryogenic carbon dioxide inlet VIII, 22. Liquid carbon dioxide outlet IX, 23. Cryogenic carbon dioxide outlet X, 24. Driving motor, 25. Arc hole, 26. Partition, 27. Shell, 28. Fan-shaped area. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0046] As introduced in the background technology, in the prior art, workpiece lubrication and chip treatment are handled separately. In order to solve the above technical problems, the present invention proposes a dry cleaning and low-temperature minimal lubrication combined system.

[0047] Embodiment 1

[0048] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a dry cleaning and low-temperature micro-lubrication combined system comprises a liquid carbon dioxide cylinder 1, a first valve 4, and a cooling bin 6 connected in sequence, a second valve 8 and the cooling bin 6 are respectively connected to an adjustable nozzle 9, the second valve 8 and a micro-lubricating oil pump 11 are respectively connected to a gas-liquid mixing nozzle 10, the liquid carbon dioxide cylinder 1 is connected to the first valve through a low-temperature insulation pipe 2, a primary valve 3 is provided at the low-temperature insulation pipe 2, a pressure reducing valve 5 is provided between the first valve 4 and the cooling bin 6, and a mass flow meter 7 is provided between the cooling bin 6 and the second valve 8;

[0049] One end of the first valve 4 is connected to the external gas source, and the other end is divided into two paths, which are respectively connected to the low-temperature carbon dioxide inlet VI I 20 of the cooling bin 6 and the pressure reducing valve 5; one end of the second valve 8 is connected to a flow meter such as a mass flow meter 7, and the other end is divided into two paths, which are respectively connected to the adjustable nozzle 9 and the gas-liquid mixing nozzle 10;

[0050] Among them, the primary valve 3 is a safety valve, and the first valve 4, the mass flow meter 7, the second valve 8, and the micro-lubricating oil pump 11 are separately connected to the control unit 12.

[0051] refer to Figure 3As shown, the first valve 4 and the second valve 8 are both electrically controlled two-way valves, and the structures of the first valve and the second valve 8 are the same. A rotating power source is built in both of them. The rotating power source is a driving motor 24. The driving motor 24 drives the partition 26 to rotate to realize the opening and closing control of the passage. The driving motor 24 is connected to the control unit 12, and sends a signal to the control unit 12 through the milling machine control system. The control unit controls the rotation of the corresponding driving motor 24. The partition 26 is provided with a fan-shaped area 28, and the partition 26 is provided with an arc hole 25 on the peripheral side of the fan-shaped area 28. A carbon dioxide inlet is provided on one side of the shell, and a cavity is formed between the partition 26 and the carbon dioxide inlet. The shell 27 is provided with a first outlet and a second outlet. During the rotation of the partition 26, the arc hole 25 is connected to at least one of the first outlet and the second outlet, and the fan-shaped area 28 can block the first outlet. The angle corresponding to the fan-shaped area 28 is between 40° and 60°.

[0052] In this embodiment, the initial positions of the fan-shaped areas in the first valve 4 and the second valve 8 are both at the position of the first outlet on the upper side. At this time, the fan-shaped area covers the first outlet, so that the first outlet is in a closed state. The angle of the fan-shaped area on the partition is 40°. This fan-shaped area 28 is only used to control the opening and closing of the first outlet on the upper side. When the driving motor drives the partition to rotate the set angle, the arc hole 25 is connected to the first outlet and the second outlet, so that the first outlet and the second outlet are both open;

[0053] refer to Figure 4 and Figure 5 As shown, the first valve has a low-temperature carbon dioxide inlet Ⅰ14, a first outlet and a second outlet, respectively, a low-temperature carbon dioxide outlet Ⅱ15 and a low-temperature carbon dioxide outlet Ⅲ16; Figure 6 and Figure 7 As shown, the carbon dioxide inlet of the second valve is a low-temperature carbon dioxide inlet IV17, and the first outlet and the second outlet are a low-temperature carbon dioxide outlet V18 and a low-temperature carbon dioxide outlet VI19 respectively.

[0054] It should be noted that the drive motors 24 of the first valve 4 and the second valve 8 are both connected to the control unit 12, and the control unit 12 is connected to the milling machine control system through the reserved milling machine communication interface 13 (the milling machine control system is programmed to communicate with the control unit 12 and send the milling cutter cutting-in and milling cutter cutting-out signals to the control unit 12). When the milling cutter cuts in, the low-temperature carbon dioxide outlet II15 of the first valve 4 and the low-temperature carbon dioxide outlet V18 of the second valve 8 are both closed. At this time, the low-temperature minimal lubrication system is turned on to provide cooling and lubrication for the cutting area; when the milling cutter cuts out, the two low-temperature carbon dioxide outlets of the first valve 4 are both opened, the low-temperature carbon dioxide outlet V18 of the second valve 8 is opened, and the low-temperature carbon dioxide outlet VI19 is closed. At this time, dry cleaning is turned on, and two nozzles are used for dry cleaning and low-temperature minimal lubrication respectively, and no additional oil mist will be introduced during dry cleaning.

[0055] Among them, it needs to be explained that when both outlets of the first valve 4 are open, the rotation angle of the partition is greater than 30°, and when the second valve closes the lower opening and opens the upper opening, the rotation angle of the partition is 180°, so that the fan-shaped area closes the lower opening. In this way, the control unit controls the rotation angle of the partition in the first valve and the second valve to realize the opening or closing of the corresponding passages of the first valve 4 and the second valve 8.

[0056] refer to Figure 8 and Fig. 9 As shown, the cooling bin 6 has two low-temperature carbon dioxide inlets, namely, low-temperature carbon dioxide inlet VI I 20 and low-temperature carbon dioxide inlet VIII 21, and is also provided with two outlets, one is a liquid carbon dioxide outlet IX22, and the other is a low-temperature carbon dioxide outlet X23. The low-temperature carbon dioxide inlet VII 20 is connected to the low-temperature carbon dioxide outlet II 15 of the first valve 4, and the heat exchange pipeline spirals through the cooling bin 6 to increase the heat exchange area; the low-temperature carbon dioxide inlet VIII 21 is connected to the pressure reducing valve 5, and the extremely low-temperature carbon dioxide after decompression fills the entire cooling bin 6 as a heat exchange medium; the pressure of the pipeline connected to the low-temperature carbon dioxide inlet VIII 21 of the cooling bin 6 is greatly reduced after passing through the pressure reducing valve, so that the gas temperature is also greatly reduced, which can be reduced to -50°C; the heat exchange pipeline connected to the low-temperature carbon dioxide inlet VI I 20 of the cooling bin 6 has not been decompressed, and the pressure inside the heat exchange pipeline is the same as that after passing through the first valve; combined with Fig.11 It can be seen from the carbon dioxide three-phase diagram in that at this time, the gaseous and liquid carbon dioxide enters the heat exchange pipeline through the low-temperature carbon dioxide inlet VI I 20 of the cooling bin 6, and is converted into liquid carbon dioxide after heat exchange with the gas in the cooling bin 6, and is discharged through the liquid carbon dioxide outlet IX22. Because both pipelines contain low-temperature media, this heat exchange process does not cause a significant increase in the temperature of the carbon dioxide used in the minimal lubrication system;

[0057] It is easy to understand that the pressure reducing valve 5 regulates the gas pressure in the low-temperature micro-lubrication system pipeline. Since the gas pressure in the bottle is as high as 6.5MPa, the pressure required for micro-lubrication can be below 0.5MPa, and the first-level valve 3 and the pressure reducing valve 5 are sufficient for regulation; the mass flow meter 7 regulates the gas flow; the lubricating oil is provided by the micro-lubricating oil pump 11, and the lubricating oil is dispersed and fully mixed by the high-speed gas in the gas-liquid mixing nozzle 10 and then sprayed out.

[0058] Embodiment 2

[0059] This embodiment provides a working method of a dry cleaning and low-temperature micro-lubrication combined system. Fig.10 As shown, including the following:

[0060] Liquid carbon dioxide is discharged from the liquid carbon dioxide bottle, and part of the liquid carbon dioxide is decompressed from the liquid carbon dioxide bottle through a primary valve to form gaseous carbon dioxide;

[0061] The liquid carbon dioxide and the gaseous carbon dioxide pass through the first valve 4 and then the pressure reducing valve 5, and then the liquid carbon dioxide is converted into gaseous carbon dioxide and flows into the cooling bin 6. During the conversion into gaseous carbon dioxide, the temperature rises, and the gaseous carbon dioxide enters the cooling bin. The gaseous carbon dioxide discharged from the cooling bin enters the second valve, and flows to the gas-liquid mixing nozzle 10 through the second valve. The gaseous carbon dioxide entering the gas-liquid mixing nozzle 10 is mixed with the lubricating oil to perform low-temperature lubrication on the workpiece.

[0062] Alternatively, liquid carbon dioxide and gaseous carbon dioxide are divided into two paths after passing through the first valve 4. One path flows directly to the heat exchange pipeline inside the cooling bin 6, and the other path is converted into gaseous carbon dioxide after passing through the pressure reducing valve and flows to the inside of the cooling bin. The temperature increases during the conversion into gaseous carbon dioxide. The liquid carbon dioxide discharged from the heat exchange pipeline of the cooling bin enters the adjustable nozzle 9, and the gaseous carbon dioxide discharged from the cooling bin enters the adjustable nozzle 9 through the second valve 8. The gaseous carbon dioxide and liquid carbon dioxide entering the adjustable nozzle are mixed and then used to dry clean the workpiece.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dry cleaning and low temperature micro-lubrication combined system, characterized in that: It includes a liquid carbon dioxide bottle, a primary valve, a first valve and a cooling bin connected in sequence. Part of the liquid carbon dioxide is reduced in pressure from the liquid carbon dioxide bottle through the primary valve to form gaseous carbon dioxide. The liquid carbon dioxide and the gaseous carbon dioxide can flow toward the cooling bin through the pressure reducing valve after passing through the first valve, or can be divided into two paths, one path flows directly to the heat exchange pipeline inside the cooling bin, and the other path is converted into gaseous carbon dioxide after passing through the pressure reducing valve and flows to the inside of the cooling bin. The temperature rises during the conversion into gaseous carbon dioxide. The liquid carbon dioxide discharged from the heat exchange pipeline of the cooling bin enters an adjustable nozzle. The gaseous carbon dioxide discharged from the cooling bin can enter the adjustable nozzle after passing through the second valve, or enter the gas-liquid mixing nozzle. The gaseous carbon dioxide entering the adjustable nozzle is mixed with the liquid carbon dioxide to perform dry cleaning on the workpiece, and the gaseous carbon dioxide entering the gas-liquid mixing nozzle is mixed with lubricating oil to perform low-temperature lubrication on the workpiece.

2. A dry cleaning and low temperature minimal lubrication combined system according to claim 1, characterized in that: The first valve and the second valve are connected to the control unit respectively, and the control unit is connected to the milling machine control system to transmit the signals of the milling cutter cutting in and out to the control unit. When the milling cutter cuts in, the gas-liquid mixing nozzle works and the adjustable nozzle is closed. When the milling cutter cuts out, the adjustable nozzle works and the gas-liquid mixing nozzle is closed.

3. A dry cleaning and low temperature minimal lubrication combined system according to claim 2, characterized in that: When the milling cutter cuts in, the passage between the first valve and the heat exchange pipeline is closed, the passage between the first valve and the pressure reducing valve is opened, the passage between the second valve and the adjustable nozzle is closed, and the passage between the second valve and the gas-liquid mixing nozzle is opened.

4. A dry cleaning and low temperature minimal lubrication combined system according to claim 2, characterized in that: When the milling cutter cuts out, the passages between the first valve and the heat exchange pipeline and the pressure reducing valve are all opened, the passage between the second valve and the gas-liquid mixing nozzle is closed, and the passage between the second valve and the adjustable nozzle is opened.

5. A dry cleaning and low temperature minimal lubrication combined system according to claim 2, characterized in that: The gas-liquid mixing nozzle is connected to a micro-lubricating oil pump, and the micro-lubricating oil pump is connected to the control unit; The gas-liquid mixing nozzle and the adjustable nozzle are respectively arranged on both sides of the milling cutter, and the gas-liquid mixing nozzle and the adjustable nozzle are both arranged obliquely relative to the central axis of the milling cutter.

6. A dry cleaning and low temperature minimal lubrication combined system according to claim 1, characterized in that: The heat exchange pipeline in the cooling bin is arranged in a spiral shape.

7. A dry cleaning and low temperature minimal lubrication combined system according to claim 2, characterized in that: A flow meter is arranged between the cooling bin and the second valve, and the flow meter is connected to the control unit.

8. A dry cleaning and low temperature minimal lubrication combined system according to claim 1, characterized in that: The first valve includes a shell, a carbon dioxide inlet is arranged on one side of the shell, a partition is arranged in the shell, a distance is set between the partition and the carbon dioxide inlet, the shell supports a rotating power source, the rotating power source is connected to the partition to drive the partition to rotate relative to the shell, the partition is provided with a fan-shaped area, the partition is provided with an arc hole on the peripheral side of the fan-shaped area, the shell is provided with a first outlet and a second outlet, and the arc hole is connected with at least one of the first outlet and the second outlet during the rotation of the partition.

9. A dry cleaning and low temperature minimal lubrication combined system according to claim 8, characterized in that: The structure of the first valve is the same as that of the second valve, and the angle of the arc-shaped hole is greater than 180°.

10. A working method of a dry cleaning and low temperature minimal lubrication combined system according to any one of claims 1 to 9, characterized in that: It includes the following: Liquid carbon dioxide is discharged from the liquid carbon dioxide bottle, and part of the liquid carbon dioxide is decompressed from the liquid carbon dioxide bottle through a primary valve to form gaseous carbon dioxide; Liquid carbon dioxide and gaseous carbon dioxide pass through the first valve and then the pressure reducing valve, and then the liquid carbon dioxide is converted into gaseous carbon dioxide and flows into the cooling bin. During the conversion into gaseous carbon dioxide, the temperature rises, and the gaseous carbon dioxide enters the cooling bin. The gaseous carbon dioxide discharged from the cooling bin enters the second valve, and flows to the gas-liquid mixing nozzle through the second valve. The gaseous carbon dioxide entering the gas-liquid mixing nozzle is mixed with the lubricating oil to perform low-temperature lubrication on the workpiece. Alternatively, liquid carbon dioxide and gaseous carbon dioxide are divided into two paths after passing through the first valve. One path flows directly to the heat exchange pipeline inside the cooling bin, and the other path is converted into gaseous carbon dioxide after passing through the pressure reducing valve and flows to the inside of the cooling bin. The temperature rises during the conversion into gaseous carbon dioxide. The liquid carbon dioxide discharged from the heat exchange pipeline of the cooling bin enters the adjustable nozzle, and the gaseous carbon dioxide discharged through the cooling bin enters the adjustable nozzle through the second valve. The gaseous carbon dioxide and liquid carbon dioxide entering the adjustable nozzle are mixed and then used to dry clean the workpiece.

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