A CNC lathe tailstock spindle sealing structure and method

Abstract

The present invention relates to the field of airtight equipment for numerically controlled lathes, and specifically to a sealing structure and method for the tailstock spindle of a numerically controlled lathe, comprising a tailstock of a lathe and a rotating spindle rotatably connected in the tailstock of the lathe, wherein the left end of the rotating spindle is fixedly connected to a processing spindle. The present invention provides an airtight mechanism, injects high-pressure gas through a vent pipe, and the high-pressure gas passes through a throttle valve that can adjust the flow rate of the airflow, and is injected into the airtight cylinder through a connecting cavity, thereby increasing the pressure in the airtight cylinder. At the same time, a small portion of the gas is sprayed toward the surface of the processing spindle through a conical groove, and the cutting fluid and metal waste close to the surface of the sealing ring are washed away from the surface of the sealing ring, thereby effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing, and the continuous injection of high-pressure airflow can take away the heat generated by the bearing support system during high-speed continuous operation, thereby improving the heat dissipation conditions of the system and extending the service life of the bearing.

Description

Technical Field

[0001] The invention relates to the field of airtight equipment for numerically controlled lathes, in particular to a sealing structure for a tailstock spindle of a numerically controlled lathe and a sealing method thereof. Background Art

[0002] The CNC lathe is a Class A high-precision equipment in the axle workshop. It is the main equipment for precision turning the three-diameter axle. It is responsible for high-precision three-diameter axle turning instead of grinding. The electric spindle is a technology that integrates the machine tool spindle and the spindle motor in the field of CNC machine tools. It belongs to the high-precision technology industry. The electric spindle is installed on various machine tools for the processing of parts. The processing of most parts requires the injection of cutting fluid, which will also produce iron filings and other dirt. When the electric spindle is used at a higher speed and in a complex environment, dirt is not allowed to enter the shaft core and bearings of the electric spindle. Moreover, the matching requirements of some parts inside the electric spindle are very high, and dirt is not allowed to enter the spindle.

[0003] In the prior art, the sealing form of the tailstock spindle of a CNC lathe is radially installed by relying on the front end cover. The VD95A end water seal ring and the axially installed VD95A end water seal ring are not ideal in blocking cutting fluid and metal powder when used on site, especially when the tailstock spindle rotates at high speed, which makes it easy for cutting fluid and metal powder to penetrate into the tailstock spindle, causing damage to the tailstock spindle bearing.

[0004] Based on this, the present invention designs a CNC lathe tailstock spindle sealing structure and method thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a CNC lathe tailstock spindle sealing structure and method thereof, so as to solve the problem that in the prior art proposed in the above-mentioned background technology, when the tailstock spindle rotates at a high speed, the barrier effect on cutting fluid and metal powder is not ideal, resulting in the cutting fluid and metal powder easily penetrating into the tailstock spindle, causing damage to the tailstock spindle bearing.

[0006] To achieve the above object, the present invention provides the following technical solutions: a CNC lathe tailstock spindle sealing structure, comprising a lathe tailstock and a rotating spindle rotatably connected in the lathe tailstock, wherein the left end of the rotating spindle is fixedly connected to a processing spindle, the end of the lathe tailstock is fixedly connected to a sealing seat in a detachable manner, the inner wall of the sealing seat is rotatably connected to the left end surface of the rotating spindle, the left end of the processing spindle extends out of the sealing seat, and an airtight mechanism is arranged in the sealing seat;

[0007] The airtight mechanism comprises an airtight cylinder, which is sleeved in a sealing seat, an inner wall of the right end of the airtight cylinder is rotatably connected to the right end surface of the machining spindle, a left end of the airtight cylinder is fixedly connected to the sealing seat in a detachable manner, a throttle valve is fixedly connected to the left end of the airtight cylinder, a sealing cover is fixedly connected to the left end of the throttle valve in a detachable manner, an inner wall of the right end of the sealing cover is sleeved on the outer wall of the sealing seat and is detachably fixedly connected to the surface of the sealing seat, a sealing ring is rotatably connected to the inner wall of the left end of the sealing cover, the sealing ring is sleeved on the surface of the machining spindle and is rotatably connected to the machining spindle;

[0008] A connecting cavity is arranged in a common array inside the airtight cylinder and the side wall of the throttle valve. One end of the connecting cavity is connected to the outer wall of the throttle valve, and the other end is connected to the inner wall of the right end of the airtight cylinder. Connectors are fixedly connected to the positions of the connecting cavity ports on the outer wall of the throttle valve. The connectors are fixedly connected to ventilation pipes. The ventilation pipes are fixedly connected to the external pneumatic triplet. A clearance groove is arranged in an array on the side wall of the right end of the sealing cover.

[0009] The sealing ring end array is provided with a tapered groove;

[0010] During operation, in the prior art, when the tailstock spindle rotates at high speed, the barrier effect on cutting fluid and metal powder is not ideal, which causes the cutting fluid and metal powder to easily penetrate into the tailstock spindle, causing the tailstock spindle bearing to be damaged. The specific operation is as follows: first install the rotating spindle and the machining spindle into the lathe tailstock, and connect them to the power components in the lathe tailstock, then fix the sealing seat to the left end of the lathe tailstock by bolts, then insert the airtight cylinder and the throttle valve into the sealing seat, and fix them by bolts, and then put the sealing cover with a sealing ring on the surface of the sealing seat and fix it by bolts, finally connect the vent pipes to the connectors on the surface of the throttle valve respectively, and at the same time, fix the vent pipes to the pneumatic triplet of the peripheral device. When the machining spindle is working, the pneumatic triplet sets the sealing pressure value at 0.5MPa, and passes the vent pipe The high-pressure gas is injected, so that the high-pressure gas passes through a throttle valve with adjustable air flow rate, and then is injected into the airtight cylinder through the connecting cavity, thereby increasing the pressure inside the airtight cylinder. While the pressure inside the airtight cylinder increases, a small part of the gas is sprayed toward the surface of the machining spindle through the conical groove, and the cutting fluid and metal waste close to the surface of the sealing ring are flushed away from the surface of the sealing ring, thereby effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing. At the same time, due to the continuous injection of high-pressure airflow, the heat generated by the bearing support system during high-speed continuous operation can be taken away, thereby improving the heat dissipation conditions of the system, extending the service life of the bearing, and solving the problem that the barrier effect of the cutting fluid and metal powder is not ideal when the tailstock spindle rotates at high speed, resulting in the cutting fluid and metal powder easily penetrating into the tailstock spindle, causing the tailstock spindle bearing to be damaged.

[0011] As a further scheme of the present invention, a partition is fixedly connected to the inner wall array of the airtight cylinder, the right end of the partition is fixedly connected to the right end of the inner wall of the airtight cylinder, the left end of the partition is fixedly connected to the left end of the throttle valve, and the connecting cavity array is distributed between the two partitions; during operation, when the ventilation pipe injects gas into the airtight cylinder, the gas will be sprayed outward through the conical groove, causing the gas in the airtight cylinder to always flow, making it difficult to ensure that the pressures at different positions of the airtight cylinder are the same, resulting in different amounts of gas sprayed from each conical groove, thereby reducing the barrier effect on cutting fluid and metal powder. By setting a partition, the airtight cylinder is divided into multiple chambers of the same size, and high-pressure gas passes through each chamber. When the pressure in a chamber is reduced, the ventilation pipe at that location can be individually controlled by an external pneumatic triplet to increase the pressure in the chamber, so that the pressures at different positions of the airtight cylinder are the same, and the amount of gas sprayed from each conical groove is the same, thereby improving the barrier effect on cutting fluid and metal powder.

[0012] As a further solution of the present invention, the inner wall of the airtight cylinder is fixedly connected with an annular connecting plate, the partitions are fixedly connected with the annular connecting plate, the inner wall of the annular connecting plate is rotatably connected to the surface of the machining spindle, and the surface array of the annular connecting plate is provided with flow holes; when working, the airtight cylinder is divided into two left and right pressurized chambers by setting the annular connecting plate and the flow holes, thereby improving the airtightness of the airtight cylinder, thereby improving the barrier effect against cutting fluid and metal powder.

[0013] As a further solution of the present invention, a rotating shaft is rotatably connected in an array on the right side wall of the annular connecting plate, a spiral conveying blade is fixedly connected to the surface of the rotating shaft, the right end of the rotating shaft is rotatably connected to the inner side of the airtight cylinder, and a driving blade is fixedly connected to the surface of the right end of the rotating shaft; during operation, by arranging the spiral conveying blades and the driving blades, when the ventilation pipe injects gas into the airtight cylinder, the high-pressure gas first blows the driving blades, causing the driving blades to rotate, thereby causing the spiral conveying blades to rotate, and quickly discharging the high-pressure gas into the left chamber, thereby improving the air flowability in the airtight cylinder, improving the heat dissipation effect, and extending the service life of the bearing.

[0014] In order to solve the above problems, the present invention also proposes a method for installing a tailstock spindle sealing structure of a CNC lathe, and the method for installing a tailstock spindle sealing structure of a CNC lathe comprises the following steps:

[0015] Step 1: Install the rotating spindle and the machining spindle into the lathe tailstock and connect them with the power components in the lathe tailstock;

[0016] Step 2: Then fix the sealing seat to the left end of the lathe tailstock by bolts, then insert the airtight cylinder and the throttle valve into the sealing seat and fix them by bolts;

[0017] Step 3: Then put the sealing cover with the sealing ring on the surface of the sealing seat and fix it with bolts;

[0018] Step 4: Finally, connect the ventilation pipe to the connector on the surface of the throttle valve, and fix the ventilation pipe to the pneumatic triplex of the peripheral device.

[0019] In order to solve the above problems, the present invention also proposes a method for using a tailstock spindle sealing structure of a CNC lathe, and the method for using the tailstock spindle sealing structure of a CNC lathe comprises the following steps:

[0020] Step 1: When the machining spindle is working, the pneumatic triplex is set to the sealed pressure value at 0.5MPa, and high-pressure gas is injected through the vent pipe;

[0021] Step 2: The high-pressure gas passes through a throttle valve that can adjust the flow rate of the gas flow, and then is injected into multiple chambers of the same size in the airtight cylinder through the connecting cavity;

[0022] Step 3: When the vent pipe injects gas into the airtight cylinder, the high-pressure gas first blows the driving blade, causing the driving blade to rotate, thereby causing the spiral conveying blade to rotate, and quickly discharge the high-pressure gas into the left chamber;

[0023] Step 4: Finally, the pressure inside the airtight cylinder increases, and at the same time, a small part of the gas is sprayed toward the surface of the machining spindle through the conical groove, flushing the cutting fluid and metal waste close to the surface of the sealing ring, keeping them away from the surface of the sealing ring, and effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides an airtight mechanism, and injects high-pressure gas through a ventilation pipe. The high-pressure gas passes through a throttle valve that can adjust the airflow rate and is injected into the airtight cylinder through a connecting cavity, thereby increasing the pressure inside the airtight cylinder. At the same time, a small portion of the gas passes through a conical groove and is sprayed toward the surface of the machining spindle, thereby flushing the cutting fluid and metal waste close to the surface of the sealing ring and keeping them away from the surface of the sealing ring, thereby effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing. In addition, the continuous injection of high-pressure airflow can take away the heat generated by the bearing support system during high-speed continuous operation, thereby improving the heat dissipation conditions of the system and extending the service life of the bearing.

[0026] 2. The present invention divides the airtight cylinder into multiple chambers of the same size by setting a partition, and high-pressure gas passes through each chamber. When the pressure in a chamber decreases, the ventilation pipe at that location can be independently controlled by an external pneumatic triplet to increase the pressure in the chamber, so that the pressure at different positions of the airtight cylinder is the same, and the amount of gas sprayed from each conical groove is the same, thereby improving the barrier effect on cutting fluid and metal powder.

[0027] 3. The present invention provides spiral conveying blades and driving blades. When the ventilation pipe injects gas into the airtight cylinder, the high-pressure gas first blows the driving blades to rotate the driving blades, thereby causing the spiral conveying blades to rotate and quickly discharge the high-pressure gas into the left chamber, thereby improving the air flowability in the airtight cylinder, improving the heat dissipation effect, and extending the service life of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is a first schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a second schematic diagram of the overall structure of the present invention (with the sealing cover and the sealing ring hidden);

[0031] Figure 3 The third schematic diagram of the overall structure of the present invention (hiding the lathe tailstock, sealing seat, sealing cover and sealing ring);

[0032] Figure 4 is a cross-sectional view of the airtight cylinder of the present invention;

[0033] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0034] Figure 6 This is a diagram showing the connection of the airtight mechanism in the present invention;

[0035] Figure 7 This is a diagram showing the connection between the sealing cover and the sealing ring in the present invention;

[0036] Figure 8 is a flow chart of the installation method of the present invention;

[0037] Fig. 9 The figure is a flow chart of the method for using the present invention.

[0038] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0039] Lathe tailstock 1, rotating spindle 2, machining spindle 3, sealing seat 4, airtight cylinder 5, throttle valve 6, sealing cover 7, sealing ring 8, connecting cavity 9, connector 10, vent pipe 11, give way groove 12, conical groove 13, partition 14, annular connecting plate 15, flow hole 16, rotating shaft 17, spiral conveying blade 18, driving blade 19. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-9 The present invention provides a technical solution: a spindle sealing structure of a tailstock 1 of a numerically controlled lathe, comprising a tailstock 1 of a lathe and a rotating spindle 2 rotatably connected in the tailstock 1 of the lathe, a machining spindle 3 being fixedly connected to the left end of the rotating spindle 2, a sealing seat 4 being fixedly connected to the end of the tailstock 1 of the lathe in a detachable manner, an inner wall of the sealing seat 4 being rotatably connected to the left end surface of the rotating spindle 2, a left end of the machining spindle 3 extending out of the sealing seat 4, and an airtight mechanism being arranged in the sealing seat 4;

[0042] The airtight mechanism includes an airtight cylinder 5, which is sleeved in the sealing seat 4, the inner side wall of the right end of the airtight cylinder 5 is rotatably connected to the right end surface of the processing spindle 3, the left end of the airtight cylinder 5 is fixedly connected to the sealing seat 4 in a detachable manner, the left end of the airtight cylinder 5 is fixedly connected to a throttle valve 6, the left end of the throttle valve 6 is fixedly connected to a sealing cover 7 in a detachable manner, the inner side wall of the right end of the sealing cover 7 is sleeved on the outer side wall of the sealing seat 4 and is detachably fixedly connected to the surface of the sealing seat 4, the inner side wall of the left end of the sealing cover 7 is rotatably connected to a sealing ring 8, the sealing ring 8 is sleeved on the surface of the processing spindle 3 and is rotatably connected to the processing spindle 3;

[0043] A connecting cavity 9 is arranged in a common array in the side walls of the airtight cylinder 5 and the throttle valve 6. One end of the connecting cavity 9 is connected to the outer wall of the throttle valve 6, and the other end is connected to the inner wall of the right end of the airtight cylinder 5. Connectors 10 are fixedly connected to the positions of the ports of the connecting cavity 9 on the outer wall of the throttle valve 6. The connectors 10 are fixedly connected to ventilation pipes 11. The ventilation pipes 11 are fixedly connected to the external pneumatic triplet. A clearance groove 12 is arranged in an array on the right end side wall of the sealing cover 7.

[0044] The end array of the sealing ring 8 is provided with a tapered groove 13;

[0045] During operation, in the prior art, when the tailstock spindle rotates at high speed, the barrier effect on cutting fluid and metal powder is not ideal, which causes the cutting fluid and metal powder to easily penetrate into the tailstock spindle, causing the tailstock spindle bearing to be damaged. The specific operation is as follows: first install the rotating spindle 2 and the machining spindle 3 into the lathe tailstock 1, and connect them to the power components in the lathe tailstock 1, and then fix the sealing seat 4 to the left end of the lathe tailstock 1 by bolts, and then insert the airtight tube 5 and the throttle valve 6 into the sealing seat 4 and fix them by bolts, and then put the sealing cover 7 with the sealing ring 8 on the surface of the sealing seat 4 and fix it by bolts, and finally connect the vent pipe 11 to the connector 10 on the surface of the throttle valve 6 respectively, and at the same time, fix the vent pipe 11 to the external pneumatic triplet. When the machining spindle 3 is working, the pneumatic triplet sets the sealing pressure value at 0.5MPa, and High-pressure gas is injected through the vent pipe 11, so that the high-pressure gas passes through the throttle valve 6 which can adjust the airflow rate, and then is injected into the airtight cylinder 5 through the connecting cavity 9, thereby increasing the pressure in the airtight cylinder 5. While the pressure in the airtight cylinder 5 increases, a small part of the gas is sprayed toward the surface of the processing spindle 3 through the conical groove 13, and the cutting fluid and metal waste near the surface of the sealing ring 8 are flushed away from the surface of the sealing ring 8, thereby effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing. At the same time, due to the continuous injection of high-pressure airflow, the heat generated by the bearing support system during high-speed continuous operation can be taken away, thereby improving the heat dissipation conditions of the system, extending the service life of the bearing, and solving the problem that the cutting fluid and metal powder are not blocked when the tailstock spindle rotates at high speed, resulting in the cutting fluid and metal powder easily penetrating into the tailstock spindle, causing the tailstock spindle bearing to be damaged.

[0046] As a further solution of the present invention, the inner wall array of the airtight cylinder 5 is fixedly connected with a partition 14, the right end of the partition 14 is fixedly connected to the right end of the inner wall of the airtight cylinder 5, the left end of the partition 14 is fixedly connected to the left end of the throttle valve 6, and the connecting chamber 9 array is distributed between the two partitions 14; when working, when the vent pipe 11 injects gas into the airtight cylinder 5, the gas will be ejected outward through the conical groove 13, causing the gas in the airtight cylinder 5 to always flow, making it difficult to ensure that the pressure at different positions of the airtight cylinder 5 is the same, resulting in each conical groove 13 The amount of injected gas is different, thereby reducing the barrier effect of cutting fluid and metal powder. By setting the partition 14, the airtight cylinder 5 is divided into multiple chambers of the same size. At the same time, high-pressure gas passes through each chamber. When the pressure in a chamber is reduced, the ventilation pipe 11 at that location can be controlled separately by an external pneumatic triplet to increase the pressure in the chamber, so that the pressure at different positions of the airtight cylinder 5 is the same, and each conical groove 13 injects the same amount of gas, thereby improving the barrier effect on cutting fluid and metal powder.

[0047] As a further solution of the present invention, an annular connecting plate 15 is fixedly connected to the inner wall of the airtight cylinder 5, and the partitions 14 are fixedly connected to the annular connecting plate 15. The inner wall of the annular connecting plate 15 is rotatably connected to the surface of the machining spindle 3, and an array of flow holes 16 are provided on the surface of the annular connecting plate 15. When working, the airtight cylinder 5 is divided into two left and right pressurized chambers by setting the annular connecting plate 15 and the flow holes 16, thereby improving the airtightness of the airtight cylinder 5, thereby improving the barrier effect on cutting fluid and metal powder.

[0048] As a further solution of the present invention, a rotating shaft 17 is rotatably connected in an array on the right side wall of the annular connecting plate 15, a spiral conveying blade 18 is fixedly connected to the surface of the rotating shaft 17, the right end of the rotating shaft 17 is rotatably connected to the inner side of the airtight cylinder 5, and a driving blade 19 is fixedly connected to the right end surface of the rotating shaft 17; during operation, by setting the spiral conveying blade 18 and the driving blade 19, when the ventilation pipe 11 injects gas into the airtight cylinder 5, the high-pressure gas first blows the driving blade 19, causing the driving blade 19 to rotate, thereby causing the spiral conveying blade 18 to rotate, and quickly discharges the high-pressure gas into the left chamber, thereby improving the air flowability in the airtight cylinder 5, improving the heat dissipation effect, and extending the service life of the bearing.

[0049] In order to solve the above problems, the present invention also proposes a method for installing a spindle sealing structure of a tailstock 1 of a CNC lathe, and the method for installing a spindle sealing structure of a tailstock 1 of a CNC lathe comprises the following steps:

[0050] Step 1: First, install the rotating spindle 2 and the machining spindle 3 into the lathe tailstock 1, and connect them with the power components in the lathe tailstock 1;

[0051] Step 2: Then, the sealing seat 4 is fixedly connected to the left end of the lathe tailstock 1 by bolts, and then the airtight cylinder 5 and the throttle valve 6 are inserted into the sealing seat 4 and fixed by bolts;

[0052] Step 3: Then, sleeve the sealing cover 7 with the sealing ring 8 onto the surface of the sealing seat 4 and fix it with bolts;

[0053] Step 4: Finally, the ventilation pipe 11 is connected to the connector 10 on the surface of the throttle valve 6 respectively, and the ventilation pipe 11 is fixedly connected to the external pneumatic triplex.

[0054] In order to solve the above problems, the present invention also proposes a method for using a spindle sealing structure of a tailstock 1 of a CNC lathe, and the method for using the spindle sealing structure of the tailstock 1 of a CNC lathe comprises the following steps:

[0055] Step 1: When the machining spindle 3 is working, the pneumatic triplex sets the sealing pressure value to 0.5 MPa, and injects high-pressure gas through the vent pipe 11;

[0056] Step 2: The high-pressure gas passes through the throttle valve 6 which can adjust the air flow rate, and then is injected into the multiple chambers of the same size in the airtight cylinder 5 through the connecting cavity 9;

[0057] Step 3: When the vent pipe 11 injects gas into the airtight cylinder 5, the high-pressure gas first blows the driving blade 19, causing the driving blade 19 to rotate, thereby causing the spiral conveying blade 18 to rotate, and quickly discharge the high-pressure gas into the left chamber;

[0058] Step 4: Finally, the pressure inside the airtight cylinder 5 increases, and at the same time, a small part of the gas is sprayed toward the surface of the processing spindle 3 through the conical groove 13, flushing the cutting fluid and metal waste near the surface of the sealing ring 8, keeping them away from the surface of the sealing ring 8, and effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing.

[0059] Working principle: first install the rotating spindle 2 and the processing spindle 3 into the lathe tailstock 1, and connect them to the power components in the lathe tailstock 1, then fix the sealing seat 4 to the left end of the lathe tailstock 1 by bolts, then insert the airtight tube 5 and the throttle valve 6 into the sealing seat 4, and fix them by bolts, then put the sealing cover 7 with the sealing ring 8 on the surface of the sealing seat 4, and fix it by bolts, finally connect the vent pipe 11 to the connector 10 on the surface of the throttle valve 6 respectively, and fix the vent pipe 11 to the external pneumatic triplet at the same time. When the processing spindle 3 is working, the pneumatic triplet sets the sealing pressure value at 0.5MPa, and passes the vent pipe 11 injects high-pressure gas, so that the high-pressure gas passes through the throttle valve 6 which can adjust the airflow rate, and then is injected into the airtight cylinder 5 through the connecting cavity 9, thereby increasing the pressure inside the airtight cylinder 5. While the pressure inside the airtight cylinder 5 increases, a small part of the gas is sprayed toward the surface of the processing spindle 3 through the conical groove 13, and the cutting fluid and metal waste close to the surface of the sealing ring 8 are washed away from the surface of the sealing ring 8, thereby effectively blocking the entry of metal powder, cutting fluid, dust, etc. generated during equipment processing. At the same time, due to the continuous injection of high-pressure airflow, the heat generated by the bearing support system during high-speed continuous operation can be taken away, thereby improving the heat dissipation conditions of the system and extending the service life of the bearing.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A CNC lathe tailstock spindle sealing structure, comprising a lathe tailstock (1) and a rotating spindle (2) rotatably connected to the lathe tailstock (1), wherein the left end of the rotating spindle (2) is fixedly connected to a machining spindle (3), characterized in that: The end of the lathe tailstock (1) is fixedly connected to a sealing seat (4) in a detachable manner, the inner wall of the sealing seat (4) is rotatably connected to the left end surface of the rotating spindle (2), the left end of the machining spindle (3) extends out of the sealing seat (4), and an airtight mechanism is arranged inside the sealing seat (4); The airtight mechanism comprises an airtight cylinder (5), the airtight cylinder (5) is sleeved in the sealing seat (4), the inner side wall of the right end of the airtight cylinder (5) is rotatably connected to the right end surface of the processing spindle (3), the left end of the airtight cylinder (5) is fixedly connected to the sealing seat (4) in a detachable manner, the left end of the airtight cylinder (5) is fixedly connected to a throttle valve (6), the left end of the throttle valve (6) is fixedly connected to a sealing cover (7) in a detachable manner, the inner side wall of the right end of the sealing cover (7) is sleeved on the outer side wall of the sealing seat (4) and is detachably fixedly connected to the surface of the sealing seat (4), the inner side wall of the left end of the sealing cover (7) is rotatably connected to a sealing ring (8), the sealing ring (8) is sleeved on the surface of the processing spindle (3) and is rotatably connected to the processing spindle (3); A connecting cavity (9) is arranged in a common array inside the side walls of the airtight cylinder (5) and the throttle valve (6); one end of the connecting cavity (9) is connected to the outer wall of the throttle valve (6), and the other end is connected to the inner wall of the right end of the airtight cylinder (5); the outer wall of the throttle valve (6) is fixedly connected to a connector (10) at a position corresponding to the port of the connecting cavity (9); the connector (10) is fixedly connected to a vent pipe (11); the vent pipe (11) is fixedly connected to an external pneumatic triplet; and a clearance groove (12) is arranged in an array on the side wall of the right end of the sealing cover (7); The end of the sealing ring (8) is provided with a tapered groove (13) in array; The inner wall array of the airtight cylinder (5) is fixedly connected to a partition plate (14), the right end of the partition plate (14) is fixedly connected to the right end of the inner wall of the airtight cylinder (5), the left end of the partition plate (14) is fixedly connected to the left end of the throttle valve (6), and the connecting chamber (9) array is distributed between the two partition plates (14); The inner wall of the airtight cylinder (5) is fixedly connected to an annular connecting plate (15), the partitions (14) are fixedly connected to the annular connecting plate (15), the inner wall of the annular connecting plate (15) is rotatably connected to the surface of the machining spindle (3), and the surface of the annular connecting plate (15) is provided with an array of flow holes (16); A rotating shaft (17) is rotatably connected in an array on the right side wall of the annular connecting plate (15), a spiral conveying blade (18) is fixedly connected to the surface of the rotating shaft (17), the right end of the rotating shaft (17) is rotatably connected to the inner side of the airtight cylinder (5), and a driving blade (19) is fixedly connected to the surface of the right end of the rotating shaft (17).

2. A method for using a tailstock spindle sealing structure for a CNC lathe, applicable to the tailstock spindle sealing structure for a CNC lathe according to claim 1, characterized in that: The method for using the spindle sealing structure of the tailstock (1) of a CNC lathe comprises the following steps: Step 1: When the machining spindle (3) is working, the pneumatic triplex sets the sealing pressure value to 0.5 MPa and injects high-pressure gas through the vent pipe (11); Step 2: The high-pressure gas passes through a throttle valve (6) capable of adjusting the flow rate of the gas flow, and then is injected into a plurality of chambers of the same size in the airtight cylinder (5) through a connecting chamber (9); Step 3: When the vent pipe (11) injects gas into the airtight cylinder (5), the high-pressure gas first blows the driving blade (19), causing the driving blade (19) to rotate, thereby causing the spiral conveying blade (18) to rotate, and quickly discharge the high-pressure gas into the left chamber; Step 4: Finally, the pressure inside the airtight cylinder (5) increases, and at the same time, a small portion of the gas is sprayed toward the surface of the processing spindle (3) through the conical groove (13), flushing the cutting fluid and metal waste near the surface of the sealing ring (8) and keeping them away from the surface of the sealing ring (8), thereby effectively blocking the entry of metal powder, cutting fluid, and dust generated during equipment processing.

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