Oil stain recovery device for numerical control machine tool

Abstract

The invention relates to the technical field of oil stain recovery, in particular to an oil stain recovery device for a numerical control machine tool, which comprises a tank body, and an oil bin and a flushing bin distributed in the tank body, and the oil bin and the flushing bin are respectively provided with a first port and a second port; a rotary plate is arranged above the tank body, a through pipe corresponding to the first through opening and the second through opening is arranged on the rotary plate, and a filter screen is arranged in the through pipe; by changing the angle of the rotary plate, the filter screen originally located at the first through opening rotates to the second through opening along with the rotary plate, the filter screen originally located at the second through opening is in a smooth state, and at the moment, the first through opening can continue to be matched with the corresponding filter screen to filter cooling oil; when the blocked filter screen is located at the second through opening, back flushing can be conducted through the flushing bin, oil dirt impurities left on the filter screen can be removed, the filter screen can be in butt joint with a corresponding blow-off pipe, and therefore the continuous filtering effect on cooling oil is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil recovery, in particular to an oil recovery device for a numerically controlled machine tool. Background Art

[0002] CNC machine tools refer to machine tools whose motion trajectory and processing process are controlled by computer programs (or special control systems). Unlike traditional machine tools that rely on manual operation, CNC machine tools can perform precision processing in a highly automated state and are widely used in aerospace, automobile manufacturing, precision machinery and other fields.

[0003] CNC machine tools require a lot of lubricating oil and coolant during the processing. Machine tool waste oil is a harmful waste. If it is not handled in time, it will cause serious pollution to the environment. Waste oil recycling can reuse these wastes, reduce pollution to the environment, and save resources and reduce production costs.

[0004] As proposed in application number CN202411428129.2, a recovery device for oil pollution treatment of CNC machine tools comprises a main bin mechanism, the main bin mechanism comprises a tubular bin pipe, an upper end of one side of the bin pipe is fixedly connected to a first conduit, a lower end of one side of the bin pipe is fixedly connected to a second conduit, a base mechanism is arranged on the main bin mechanism, the base mechanism comprises a platform, a bin cover mechanism is arranged above the main bin mechanism, tubular middle tubes are respectively arranged in the upper and lower parts of the bin pipe, each middle tube is fixedly connected to a tube sheet on both sides, a side of the tube sheet away from the middle tube is fixedly connected to the bin pipe, a sealing strip is fixedly connected to one end of the middle tube and the tube sheet close to the middle of the bin pipe, a lower end face of the bin pipe and a lower end face of the lower middle tube are fixedly connected to an annular bottom plate, a scraping assembly for scraping off impurities is installed on the upper right tube sheet, a recovery device for oil pollution treatment of CNC machine tools, stabilizing the filtering efficiency of the filter plate.

[0005] In the above patent, in the first step, the tube and the tube plate divide the space inside the tube of the warehouse tube into two parts, front and back, for use. The front half of the space is used to filter the cooling oil, and the back half of the space is used to clean the filter plate. The impure cooling oil is introduced into the front plate space of the warehouse tube through the first conduit, filtered through the filter plate, and finally the filtered cooling oil is discharged through the second conduit. During this period, the panel is driven downward by the contraction cylinder, and the pressure plate adapted to the front half of the warehouse tube is pressed downward by the connection of the vertical plate, thereby providing pressure for the cooling oil to be filtered through the filter plate, thereby improving the cooling oil filtering efficiency. The inner middle tube and the tube plate divide the inner space of the warehouse tube into two parts, the front half of the space is used for filtering cooling oil, and the back half of the space is used for cleaning the filter plate. In the structure of filtering oil, impurities on the surface of the filter plate will accumulate around it due to its own rotation and the existence of the scraping component, while the filter plate transferred from the back half of the warehouse tube to the front half is cleaner and can promptly export the impurities accumulated on the filter plate. However, in the process of scraping the cooling oil impurities on the filter plate, it will be necessary to stop filtering the oil, which will affect the efficiency of oil filtration.

[0006] Therefore, we propose an oil recovery device for CNC machine tools to solve the above-mentioned problems. Summary of the invention

[0007] The purpose of the present invention is to provide an oil recovery device for CNC machine tools to solve the problem proposed in the above background technology that the oil filtration needs to be stopped during the process of scraping the cooling oil impurities on the filter plate, thereby affecting the oil filtration efficiency.

[0008] To achieve the above object, the present invention provides the following technical solutions: An oil recovery device for a numerically controlled machine tool comprises a tank body and an oil bin and a flushing bin distributed inside the tank body, wherein the oil bin and the flushing bin are respectively provided with a first opening and a second opening; A rotating plate rotatable along the axis of the tank body is arranged above the tank body, a through pipe corresponding to the first through opening and the second through opening is opened on the rotating plate, and a filter screen is arranged inside the through pipe; The oil tank is provided with an oil discharge port communicating with the outside, and the oil tank is also provided with a pumping and pressure conveying mechanism for conveying oil from the first port to the oil discharge port.

[0009] Preferably, it comprises a cylinder, the top end of which is closed and the bottom end is open, a partition plate is arranged inside the cylinder, the oil bin and the flushing bin are formed by the partition plate, a first opening and a second opening are arranged at the top end of the cylinder, and the first opening and the second opening correspond to the oil bin and the flushing bin respectively; The bottom end of the cylinder is sealed with a bottom plate, and the oil discharge port is arranged on the bottom plate and communicated with the oil tank.

[0010] Preferably, a first one-way valve is provided at the first port, the opening direction of the first one-way valve is toward the inside of the oil tank, and a second one-way valve is provided at the oil discharge port, the opening direction of the second one-way valve is opposite to the inside of the oil tank.

[0011] Preferably, an end ring is provided at the top of the cylinder, a slewing ring is provided inside the end ring, a sliding ring is sleeved on the outside of the slewing ring, the sliding ring and the slewing plate are rotatably connected via a bearing, a convex block is provided on the outer edge of the sliding ring, and the sliding ring is slidably connected to the end ring via the convex block; The oil recovery device also includes a rotary driver, which is transmission-connected to the rotary plate.

[0012] Preferably, the rotary driver includes a gear ring arranged on the rotating plate and a servo motor installed on the cylinder, the gear ring is fixedly connected to the rotating plate, and a gear is arranged on the output shaft of the servo motor, and the gear is meshed with the gear ring.

[0013] Preferably, a collar is provided on the top wall of the cylinder, and the collar corresponds to the first opening and the second opening respectively; The inner edge surfaces of the first opening and the second opening are both provided with an annular boss; An inner ring is arranged at the bottom of the rotary plate, the inner diameter of the inner ring is smaller than the sleeve ring, and a rubber ring in contact with the top wall of the annular boss is arranged at the bottom end of the inner ring.

[0014] Preferably, the pumping and conveying mechanism comprises a first pressing plate, the first pressing plate is slidingly and sealingly arranged inside the oil tank, a second pressing plate is arranged above the first pressing plate, an oil through hole is opened on the first pressing plate, and a rubber strip for sealing the oil through hole is arranged at the bottom of the second pressing plate; The pumping and conveying mechanism also includes a downward pressing driving component, which is used to control the lifting and lowering of the first pressing plate and the second pressing plate in the oil bin.

[0015] Preferably, the downward pressing driving assembly includes a connecting rod, the connecting rod passes through the first pressing plate, the top end of the connecting rod is connected to the first pressing plate, a limiting plate is arranged on the connecting rod, the limiting plate is located below the first pressing plate, a spring is sleeved on the connecting rod, and both ends of the spring are in contact with the first pressing plate and the second pressing plate respectively; The downward pressure driving assembly also includes a second cylinder, which is arranged below the bottom plate. The piston rod of the second cylinder penetrates the bottom plate and is connected to the bottom end of the connecting rod.

[0016] Preferably, a liquid passage is provided on the outside of the cylinder, the liquid passage is connected with the flushing chamber, and a solenoid valve is provided on the liquid passage.

[0017] Beneficial effects of the present invention: 1 In the present invention, by changing the angle of the rotating plate, the filter screen originally at the first opening will rotate with it to the second opening, and the filter screen originally at the second opening will be in an unobstructed state. At this time, the first opening can continue to cooperate with the corresponding filter screen to filter the cooling oil. The blocked filter screen can be reversely flushed through the flushing chamber when it is at the second opening to remove the oil and impurities remaining on the filter screen, and can be connected to the corresponding drain pipe, thereby achieving a continuous filtering effect on the cooling oil.

[0018] 2. During the transportation process, since the first one-way valve is arranged at the first port, and the opening direction of the first one-way valve is toward the inside of the oil tank, the cooling oil flowing into the first port will not be pushed in the opposite direction during the rising of the first pressure plate and the second pressure plate. The second one-way valve is arranged at the second port, and the opening direction of the second one-way valve is opposite to the inside of the oil tank, the cooling oil discharged from the oil outlet will not be drawn out in the opposite direction during the rising of the first pressure plate and the second pressure plate; 3. The first pressing plate and the second pressing plate will form a sealed connection, and the space above the oil tank will form a low-pressure state and suck the cooling oil flowing into the first port and suck it into the oil tank; The filtered oil below the oil tank will also be discharged from the oil discharge port under the pressure of the first pressure plate and the second pressure plate, because when the second cylinder drives the connecting rod to rise through the piston rod, the second pressure plate and the first pressure plate will separate, and the oil above the oil tank will smoothly pass through the oil port of the first pressure plate to the bottom of the oil tank, and finally be discharged through the oil discharge port, thus forming a continuous pressurized suction and discharge; 4. By changing the angle of the rotary plate, the piston rod of the first cylinder contracts to pull the rotary plate up, and the output shaft of the servo motor in the rotary driver drives the gear to rotate. Since the gear is meshed with the ring gear, the rotary plate is driven to rotate through the ring gear. The filter screen at the first port will rotate with it to the second port. The filter screen originally at the second port is in an unobstructed state, and the filter screen at the second port is transferred to the first port. The piston rod of the first cylinder pushes the rotary plate down, so that the sleeve rings above the first port and the second port are respectively connected with the inner rings under the two sleeves, and the bottom end of the inner ring is sealed with the top wall of the annular boss through rubber, which satisfies the free switching of the two filter plates and will not cause leakage of the cooling inside the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 A top view of the present invention; Figure 4 for Figure 3 A schematic diagram of a three-dimensional structure of a cross-sectional view in the AA direction; Figure 5 for Figure 4 A magnified view of point B; Figure 6 It is a schematic diagram of the internal structure of the present invention; Figure 7 for Figure 6 Enlarged view of point C; Figure 8 It is a schematic diagram of the exploded structure of the pumping and conveying mechanism of the present invention.

[0021] In the figure: 1-tank body; 11-oil tank; 111-first port; 112-oil drain port; 12-flushing tank; 121-second port; 122-liquid pipe; 123-solenoid valve; 13-cylinder body; 14-partition plate; 15-bottom plate; 16-first one-way valve; 17-second one-way valve; 18-end ring; 19-ring; 191-annular boss; 2-swivel plate; 21-through pipe; 211-inner ring; 22-filter; 23-bearing; 24-sliding ring; 3-suction and pressure conveying mechanism; 31-first pressure plate; 311-oil port; 32-second pressure plate; 321-rubber strip; 33-downward pressure drive assembly; 331-connecting rod; 332-limiting plate; 333-spring; 334-second cylinder; 4-rotation drive; 41-gear ring; 42-servo motor; 43-gear; 5-first cylinder. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] In a first aspect of the present invention, an oil recovery device for a CNC machine tool is provided. Figures 1 to 6As shown, it includes a tank body 1 and an oil tank 11 and a flushing tank 12 distributed inside the tank body 1. The oil tank 11 and the flushing tank 12 are respectively provided with a first opening 111 and a second opening 121; A rotating plate 2 is arranged above the tank body 1 and can rotate along the axis of the tank body 1. A through pipe 21 corresponding to the first through opening 111 and the second through opening 121 is opened on the rotating plate 2. A filter screen 22 is arranged inside the through pipe 21. The oil tank 11 is provided with an oil discharge port 112 communicating with the outside. The oil tank 11 is also provided with a pumping and conveying mechanism 3 for conveying oil from the first opening 111 to the oil discharge port 112 .

[0025] As an implementation method, Figure 4 and Figure 6 As shown, further: The tank body 1 includes a cylinder 13, the top end of the cylinder 13 is closed and the bottom end is open, a partition plate 14 is arranged inside the cylinder 13, the oil tank 11 and the flushing tank 12 are formed by the partition plate 14, a first opening 111 and a second opening 121 are arranged at the top end of the cylinder 13, and the first opening 111 and the second opening 121 correspond to the oil tank 11 and the flushing tank 12 respectively; A bottom plate 15 is provided at the bottom end of the cylinder 13 and is sealed thereon. An oil discharge port 112 is provided on the bottom plate 15 and is communicated with the oil tank 11 .

[0026] In this embodiment, by connecting the machine tool cooling oil to the through pipe 21 corresponding to the first through port 111, the cooling oil is filtered through the filter 22 inside the through pipe 21. The filter 22 is a metal filter 22 or a polyester filter 22 but is not limited thereto. The filtered cooling oil is discharged through the oil discharge port 112 under the action of the suction and pressure conveying mechanism 3. When the filter 22 is blocked, the discharge rate of the oil discharge port 112 will also decrease to a certain extent. At this time, by changing the angle of the rotary plate 2, the filter 22 originally at the first through port 111 will rotate with it to the second through port 121. The filter 22 originally at the second through port 121 is in an unobstructed state. At this time, the first through port 111 can continue to cooperate with the corresponding filter 22 to filter the cooling oil. When the blocked filter 22 is at the second through port 121, it can be reversely flushed through the flushing chamber 12 to remove the oil and impurities remaining on the filter 22, and can be connected to the corresponding drain pipe, thereby achieving a continuous filtering effect on the cooling oil.

[0027] As an implementation method, Figures 1 to 8 As shown, further: A first one-way valve 16 is disposed at the first opening 111 , and its opening direction is toward the inside of the oil tank 11 . A second one-way valve 17 is disposed at the oil discharge port 112 , and its opening direction is opposite to the inside of the oil tank 11 .

[0028] Further: The top of the cylinder 13 is provided with an end ring 18, a slewing ring is arranged inside the end ring 18, a sliding ring 24 is sleeved on the outside of the slewing ring, the sliding ring 24 and the slewing plate 2 are rotatably connected via a bearing 23, a convex block is arranged on the outer edge surface of the sliding ring 24, and the sliding ring 24 is slidably connected with the end ring 18 via the convex block; The oil recovery device also includes a rotary driver 4 , which is transmission-connected to the rotary plate 2 .

[0029] Further: The rotary driver 4 includes a gear ring 41 disposed on the rotary plate 2 and a servo motor 42 installed on the cylinder 13 . The gear ring 41 is fixedly connected to the rotary plate 2 . A gear 43 is disposed on the output shaft of the servo motor 42 . The gear 43 meshes with the gear ring 41 .

[0030] Further: The top wall of the cylinder 13 is provided with a collar 19, and the collar 19 corresponds to the first opening 111 and the second opening 121 respectively; The inner edge surfaces of the first opening 111 and the second opening 121 are both provided with an annular boss 191; An inner ring 211 is disposed at the bottom of the rotary plate 2 . The inner diameter of the inner ring 211 is smaller than that of the sleeve ring 19 . A rubber ring is disposed at the bottom end of the inner ring 211 to contact the top wall of the annular boss 191 .

[0031] Further: The pumping and conveying mechanism 3 includes a first pressing plate 31, which is slidingly and sealingly arranged inside the oil tank 11, a second pressing plate 32 is arranged above the first pressing plate 31, an oil through hole 311 is opened on the first pressing plate 31, and a rubber strip 321 for sealing the oil through hole 311 is arranged at the bottom of the second pressing plate 32; The pumping and conveying mechanism 3 further includes a downward pressing driving assembly 33 , which is used to control the lifting and lowering of the first pressing plate 31 and the second pressing plate 32 in the oil bin 11 .

[0032] Further: The pressing drive assembly 33 includes a connecting rod 331, the connecting rod 331 passes through the first pressing plate 31, the top end of the connecting rod 331 is connected to the first pressing plate 31, a limiting plate 332 is arranged on the connecting rod 331, the limiting plate 332 is located below the first pressing plate 31, a spring 333 is sleeved on the connecting rod 331, and the two ends of the spring 333 are in contact with the first pressing plate 31 and the second pressing plate 32 respectively; The downward pressure driving assembly 33 further includes a second cylinder 334 , which is disposed below the bottom plate 15 . The piston rod of the second cylinder 334 penetrates through the bottom plate 15 and is connected to the bottom end of the connecting rod 331 .

[0033] Further: A liquid passage 122 is disposed outside the cylinder 13 , and the liquid passage 122 is connected to the flushing chamber 12 . A solenoid valve 123 is disposed on the liquid passage 122 .

[0034] In this embodiment, by connecting the machine tool cooling oil to the through pipe 21 corresponding to the first through port 111, the cooling oil is filtered through the filter 22 inside the through pipe 21, and the pumping and pressing conveying mechanism 3 starts to work. The piston rod of the second cylinder 334 contracts and pulls the connecting rod 331. Since the first pressing plate 31 and the inner wall of the oil tank 11 are connected in a sliding seal, there will be a certain damping feeling. When the piston rod of the second cylinder 334 contracts at a sufficient rate, the connecting rod 331 will drop and squeeze the spring 333, causing the rubber strip 321 at the bottom of the second pressing plate 32 to close the oil port 311 of the first pressing plate 31. The first pressing plate 31 and the second pressing plate 32 form a sealed connection, and the space above the oil tank 11 forms a low pressure state and sucks the cooling oil flowing into the first opening 111 and sucks it into the oil tank 11; At this time, the filtered oil under the oil tank 11 will also be discharged from the oil discharge port 112 under the pressure of the first pressure plate 31 and the second pressure plate 32, because when the second cylinder 334 drives the connecting rod 331 to rise through the piston rod, the second pressure plate 32 and the first pressure plate 31 will be separated, and the oil above the oil tank 11 will smoothly pass through the oil port 311 of the first pressure plate 31 to the bottom of the oil tank 11, and finally discharged through the oil discharge port 112, thereby forming a continuous pressurized suction and discharge; During the above-mentioned conveying process, since the first one-way valve 16 is provided at the first port 111, and the opening direction of the first one-way valve 16 is toward the inside of the oil tank 11, the cooling oil flowing into the first port 111 will not be pushed in the opposite direction during the rising of the first pressure plate 31 and the second pressure plate 32. The second one-way valve 17 is provided at the second port 121, and the opening direction of the second one-way valve 17 is opposite to the inside of the oil tank 11. Therefore, the cooling oil discharged from the oil outlet 112 will not be drawn out in the opposite direction during the rising of the first pressure plate 31 and the second pressure plate 32. When the filter screen 22 is blocked, the discharge rate of the oil discharge port 112 will also decrease to a certain extent. At this time, by changing the angle of the rotary plate 2, specifically, the piston rod of the first cylinder 5 contracts to pull the rotary plate 2 up, and the output shaft of the servo motor 42 in the rotary driver 4 drives the gear 43 to rotate. Since the gear 43 is meshed with the ring gear 41, the rotary plate 2 is driven to rotate through the ring gear 41, and the filter screen 22 at the first opening 111 will rotate with it to the second opening 121. The filter screen 22 originally at the second opening 121 is in an unobstructed state, and the filter screen 22 at the second opening 121 is transferred to the first opening 111. The piston rod of the first cylinder 5 pushes the rotary plate 2 down, so that the sleeve rings 19 above the first opening 111 and the second opening 121 are respectively connected with the inner rings 211 under the two sleeves, and the bottom end of the inner ring 211 forms a seal with the top wall of the annular boss 191 through rubber; At this time, the first port 111 can continue to cooperate with the corresponding filter 22 to filter the cooling oil. When the filter 22 is blocked at the second port 121, it can be reversely flushed through the flushing chamber 12. By opening the solenoid valve 123, external cleaning water is introduced. The oily impurities remaining on the filter screen 22 are removed and connected to the corresponding sewage pipe, thereby achieving a continuous filtering effect on the cooling oil.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0036] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oil recovery device for a CNC machine tool, characterized in that: It comprises a tank body (1), and an oil bin (11) and a flushing bin (12) which are arranged inside the tank body (1), wherein the oil bin (11) and the flushing bin (12) are respectively provided with a first opening (111) and a second opening (121); A revolving plate (2) is arranged above the tank body (1) and can rotate along the axis of the tank body (1); a through pipe (21) corresponding to the first through opening (111) and the second through opening (121) is opened on the revolving plate (2); a filter screen (22) is arranged inside the through pipe (21); An oil discharge port (112) communicating with the outside is provided inside the oil bin (11), and a pumping and pressure delivery mechanism (3) for delivering oil from the first opening (111) to the oil discharge port (112) is also provided inside the oil bin (11).

2. The oil recovery device for a CNC machine tool according to claim 1, characterized in that: The tank body (1) comprises a cylinder (13), the top end of the cylinder (13) is closed and the bottom end is open, a partition plate (14) is arranged inside the cylinder (13), an oil bin (11) and a flushing bin (12) are formed by the partition plate (14), a first opening (111) and a second opening (121) are arranged at the top end of the cylinder (13), and the first opening (111) and the second opening (121) correspond to the oil bin (11) and the flushing bin (12), respectively; A bottom plate (15) is provided at the bottom end of the cylinder (13) in a sealed manner, and an oil discharge port (112) is provided on the bottom plate (15) and is in communication with the oil tank (11).

3. The oil recovery device for a CNC machine tool according to claim 2, characterized in that: A first one-way valve (16) is provided at the first opening (111), and the opening direction of the first one-way valve (16) is toward the interior of the oil tank (11). A second one-way valve (17) is provided at the oil discharge port (112), and the opening direction of the second one-way valve (17) is opposite to the interior of the oil tank (11).

4. The oil recovery device for a CNC machine tool according to claim 2, characterized in that: An end ring (18) is provided at the top end of the cylinder (13), a slewing ring is provided inside the end ring (18), a sliding ring (24) is sleeved outside the slewing ring, the sliding ring (24) and the slewing plate (2) are rotatably connected via a bearing (23), a convex block is provided on the outer edge surface of the sliding ring (24), and the sliding ring (24) is slidably connected to the end ring (18) via the convex block; The oil recovery device also includes a rotary driver (4), which is in driving connection with the rotary plate (2).

5. The oil recovery device for a CNC machine tool according to claim 4, characterized in that: The rotary driver (4) comprises a gear ring (41) arranged on the rotary plate (2) and a servo motor (42) mounted on the cylinder (13); the gear ring (41) is fixedly connected to the rotary plate (2); a gear (43) is arranged on the output shaft of the servo motor (42); and the gear (43) is meshed with the gear ring (41).

6. The oil recovery device for a CNC machine tool according to claim 4, characterized in that: A collar (19) is provided on the top wall of the cylinder (13), and the collar (19) corresponds to the first opening (111) and the second opening (121) respectively; The inner edge surfaces of the first opening (111) and the second opening (121) are both provided with an annular boss (191); An inner ring (211) is provided at the bottom of the rotating plate (2), the inner diameter of the inner ring (211) is smaller than that of the sleeve ring (19), and a rubber ring is provided at the bottom end of the inner ring (211) to contact the top wall of the annular boss (191).

7. The oil recovery device for a CNC machine tool according to claim 1, characterized in that: The pumping and conveying mechanism (3) comprises a first pressing plate (31), the first pressing plate (31) being slidably sealed and arranged inside the oil bin (11), a second pressing plate (32) being arranged above the first pressing plate (31), an oil passage (311) being provided on the first pressing plate (31), and a rubber strip (321) for sealing the oil passage (311) being provided at the bottom of the second pressing plate (32); The pumping and conveying mechanism (3) further comprises a downward pressing drive assembly (33), wherein the downward pressing drive assembly (33) is used to control the lifting and lowering of the first pressing plate (31) and the second pressing plate (32) in the oil bin (11).

8. The oil recovery device for a CNC machine tool according to claim 2, characterized in that: The downward pressing driving assembly (33) comprises a connecting rod (331), wherein the connecting rod (331) passes through the first pressing plate (31), the top end of the connecting rod (331) is connected to the first pressing plate (31), a limiting plate (332) is arranged on the connecting rod (331), the limiting plate (332) is located below the first pressing plate (31), a spring (333) is sleeved on the connecting rod (331), and two ends of the spring (333) are in contact with the first pressing plate (31) and the second pressing plate (32) respectively; The downward pressure driving assembly (33) further comprises a second cylinder (334), which is arranged below the bottom plate (15); a piston rod of the second cylinder (334) penetrates the bottom plate (15) and is connected to the bottom end of the connecting rod (331).

9. The oil recovery device for a CNC machine tool according to claim 2, characterized in that: A liquid passage pipe (122) is provided outside the cylinder (13), the liquid passage pipe (122) is connected to the flushing chamber (12), and a solenoid valve (123) is provided on the liquid passage pipe (122).

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