Air floating type tailstock structure for numerical control broach grinding machine

Abstract

The invention relates to the related technical field of numerical control lathes, in particular to an air floating type tailstock structure for a numerical control broach grinding machine, which comprises guide rails, a sliding seat, a base, a tailstock main body and a telescopic electric cylinder, a connecting lug is integrally formed on the side edge of the sliding seat, and the connecting lug on the sliding seat is fixed to the lower surface of the base through a first-stage bolt. The upper air cavity and the first-stage mounting groove are formed in the sliding seat, and the first-stage air floating plate is mounted in the first-stage mounting groove, so that air is supplied to the upper air cavity through the first-stage air supply equipment and is supplied to the upper air cavity through the first-stage air floating micropores in the first-stage air floating plate, and a layer of air film is formed between the guide rail and the sliding seat through the air; therefore, the operation friction resistance of the sliding seat is effectively reduced, the mechanical abrasion of the guide rail and the sliding seat is effectively reduced, the service life of the structure is prolonged, and the movement flexibility of the sliding seat is improved.

Description

Technical Field

[0001] This invention relates to the technical field of CNC lathes, specifically to an air-floating tailstock structure for a CNC broaching grinder. Background Technology

[0002] Chinese patent document CN120422088B discloses an automatic machining equipment for hydraulic cylinder barrels. The design includes a CNC lathe body with a tailstock inside, and a chuck. The chuck comprises an inner chuck and an outer chuck, with the outer chuck fixedly and coaxially mounted outside the inner chuck. The inner chuck is coaxially fixedly connected to the tail end of the spindle of the CNC lathe body. A coaxial clamping assembly is also included, with both the inner and outer chucks having their own coaxial clamping components. The clamping assembly is used to clamp the inner wall of the cylinder, and the coaxial clamping assembly on the outer chuck is used to clamp the outer wall of the cylinder to match different processing conditions; the adjusting assembly is provided inside both the inner and outer chucks, and the adjusting assembly inside the inner and outer chucks are independently operable to control the position of the coaxial clamping assembly; the rotating cylinder is rotatably mounted on the end of the tailstock, and a conical top block is detachably mounted on the end of the rotating cylinder; the grinding assembly is installed inside the tailstock to grind the inside of the cylinder. However, the tailstock in the above-mentioned solution is not convenient for position adjustment, and some existing guide rail slides used for tailstock adjustment are just ordinary guide rail slide structures. Their overall friction is large during operation, which leads to frequent maintenance between the structures, which is quite troublesome. Therefore, this invention proposes an air-floating tailstock structure for CNC broach grinding machines to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide an air-floating tailstock structure for a CNC broach grinding machine to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an air-floating tailstock structure for a CNC broach grinding machine, comprising: The guide rail is fixed on the rail support on the table of the CNC broach grinding machine, and a set of guide rails are symmetrically arranged. A slide block, which is slidably mounted on a guide rail, and a connecting lug is integrally formed on the side of the slide block; The base has connecting ears on the slide fixed to the lower surface of the base by a primary bolt, and a telescopic rod connecting seat is fixedly welded to the lower surface of the base. Tailstock body, which is fixed to the base by two-stage bolts; A telescopic electric cylinder, wherein the main body of the telescopic electric cylinder is fixed on the table of a CNC broach grinding machine, and the telescopic rod of the telescopic electric cylinder is fixedly connected to the telescopic rod connecting seat; The slide block has a square tube structure and is sleeved on the guide rail. An upper air chamber is opened on the upper side of the inner cavity of the slide block. A primary air guide groove is opened on the side of the upper air chamber. A primary air pipe connection port is provided on the side of the primary air guide groove. The primary air pipe connection port is connected to a primary air supply device through a primary air delivery hose. A primary installation groove is opened on the side of the upper air chamber facing the inner cavity of the slide block. A primary air flotation plate is fixedly installed in the primary installation groove. A primary air flotation micropores are evenly opened on the primary air flotation plate.

[0005] Preferably, a lower air chamber is provided on the lower side of the inner cavity of the slide block. A set of lower air chambers are symmetrically arranged, and the two lower air chambers are connected by a connecting air channel. A secondary air guide groove is provided on the outer side of the lower air chamber. A secondary air pipe connection port is provided on the side of the secondary air guide groove. The secondary air pipe connection port is connected to a secondary air supply device through a secondary air delivery hose. A secondary installation groove is provided on the side of the lower air chamber facing the inner cavity of the slide block. A secondary air flotation plate is fixedly installed in the secondary installation groove. A secondary air flotation micropore is provided on the secondary air flotation plate.

[0006] Preferably, a primary pressure gauge and a secondary pressure gauge are connected to the ports of the primary air pipe connection port and the secondary air pipe connection port, respectively. The primary pressure gauge, the secondary pressure gauge, the primary air supply device, and the secondary air supply device are all electrically connected to the PLC control module of the CNC broach grinding machine. The air supply pressure value of the primary air supply device is greater than the air supply pressure value of the secondary air supply device.

[0007] Preferably, the left and right side walls of the slide are provided with side air chambers, which are respectively connected to the corresponding secondary air guide grooves on both sides. The side air chambers facing the inner cavity of the slide are provided with tertiary installation grooves, and tertiary air flotation plates are fixedly installed in the tertiary installation grooves. Tertiary air flotation micropores are evenly provided on the tertiary air flotation plates.

[0008] Preferably, each of the first-stage, second-stage, and third-stage mounting slots has a connecting plate slot at its front end. Each connecting plate slot has a first-stage threaded hole at its bottom. Each of the first-stage, second-stage, and third-stage air flotation plates has a connecting plate integrally formed at its front end. The connecting plates on each of the first-stage, second-stage, and third-stage air flotation plates are respectively positioned corresponding to their respective connecting plate slots. Each connecting plate has a first-stage screw hole, which corresponds to a first-stage threaded hole. The connecting plate is positioned within the connecting plate slot by a first-stage positioning screw.

[0009] Preferably, the rear ends of the primary air flotation plate, the secondary air flotation plate, and the tertiary air flotation plate are all provided with secondary threaded holes, and the rear end of the slide is provided with secondary screw holes. The secondary screw holes are correspondingly provided with the secondary threaded holes, and the rear ends of the primary air flotation plate, the secondary air flotation plate, and the tertiary air flotation plate are positioned and connected to the slide by secondary positioning screws.

[0010] Preferably, the inner surface of the primary air flotation plate is provided with a primary sealing groove, the inner surface of the secondary air flotation plate is provided with a secondary sealing groove, and the inner surface of the tertiary air flotation plate is provided with a tertiary sealing groove. The primary, secondary, and tertiary sealing grooves are all rectangular frame structures, and rubber sealing gaskets are embedded in the primary, secondary, and tertiary sealing grooves. During actual installation, the rubber sealing gaskets in the primary, secondary, and tertiary sealing grooves are all in a compressed state.

[0011] Preferably, a primary air intake groove is provided on the outer side of the primary air flotation plate. The primary air intake groove connects to the primary air flotation micropores on the primary air flotation plate. The two ends of the primary air intake groove are located at the two ends of the primary air flotation plate, and the primary air flotation micropores are arranged in groups of two. The primary air intake grooves in the same group are staggered in a mesh structure.

[0012] Preferably, the outer surface of the secondary air flotation plate is provided with a secondary air intake groove, and the outer surface of the tertiary air flotation plate is provided with a tertiary air intake groove. The secondary air intake groove is used to connect the secondary air flotation micropores, and the tertiary air intake groove is used to connect the tertiary air flotation micropores. The arrangement of the secondary and tertiary air intake grooves is the same as that of the primary air intake groove.

[0013] Preferably, the end faces of the primary air flotation plate, the secondary air flotation plate, and the tertiary air flotation plate all protrude outside the mounting groove, and the protrusion thickness of the primary air flotation plate, the secondary air flotation plate, and the tertiary air flotation plate all match the depth value of the corresponding air intake groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up an air-floating tailstock structure for CNC broach grinding machines, which consists of a guide rail, slide, base, tailstock body and telescopic electric cylinder, and by opening an upper air chamber and a first-stage mounting groove on the slide, and installing a first-stage air-floating plate in the first-stage mounting groove, air is supplied to the upper air chamber through a first-stage air supply device and delivered through the first-stage air-floating micropores on the first-stage air-floating plate. This forms an air film between the guide rail and the slide, effectively reducing the running friction resistance of the slide, thereby effectively reducing the mechanical wear of the guide rail and the slide, improving the service life of the structure, and improving the movement flexibility of the slide. 2. By opening a lower air chamber and a secondary mounting groove on the lower side of the inner cavity of the slide, and opening side air chambers and tertiary mounting grooves on the left and right side walls of the slide, and setting secondary air flotation plates and tertiary air flotation plates in the secondary and tertiary mounting grooves respectively, it is ensured that air film can be stably formed on all sides of the slide, thereby further reducing the running friction resistance of the slide. 3. By opening primary air intake grooves, secondary air intake grooves, and tertiary air intake grooves on the outer sides of the primary air intake plate, secondary air intake plate, and tertiary air intake plate respectively, and ensuring that the air intake grooves are combined to form a grid structure, the airflow can be better evenly distributed by the air intake grooves, thereby effectively improving the formation and coverage effect of the air film, and further improving the drag reduction effect of the air film. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top side view of the slide of the present invention; Figure 3 This is a lower side view of the slide of the present invention; Figure 4 This is a half-sectional view of the slide block of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram showing the positions of the upper air chamber and the primary mounting slot of the present invention; Figure 7 This is a schematic diagram showing the positions of the lower air chamber and the secondary mounting groove of the present invention; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point B; Figure 9 This is an inner view of the first-stage air flotation plate of the present invention; Figure 10 This is an outer view of the primary air flotation plate of the present invention; Figure 11 for Figure 10 Enlarged schematic diagram of the structure at point B; Figure 12 This is a schematic diagram of the secondary air flotation plate structure of the present invention; Figure 13 This is a schematic diagram of the three-stage air flotation plate structure of the present invention.

[0016] In the diagram: 1. Guide rail; 2. Slide; 3. Base; 4. Tailstock body; 5. Telescopic electric cylinder; 6. CNC broach grinding machine table; 7. Track support; 8. Connecting ear; 9. Upper air chamber; 10. Primary air guide groove; 11. Primary air pipe connection port; 12. Primary mounting groove; 13. Primary air flotation plate; 14. Primary air flotation micropore; 15. Lower air chamber; 16. Connecting air passage; 17. Secondary air guide groove; 18. Secondary air pipe connection port; 19. Secondary mounting groove; 20. Secondary air flotation plate; 21. Secondary air flotation micropore; 22. Side air chamber; 23. Tertiary mounting groove; 24. Tertiary air flotation plate; 25. Tertiary air flotation micropore; 26. Connecting plate groove; 27. Primary threaded hole; 28. Secondary screw hole; 29. ​​Connecting plate; 30. Primary screw hole; 31. Secondary threaded hole; 32. Primary sealing groove; 33. Secondary sealing groove; 34. Tertiary sealing groove; 35. Rubber sealing gasket; 36. Primary air intake groove; 37. Telescopic rod connecting seat. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-13 The present invention provides the following three preferred embodiments: Example 1: An air-floating tailstock structure for a CNC broach grinding machine includes a guide rail 1, a slide 2, a base 3, a tailstock body 4, and a telescopic electric cylinder 5. The guide rail 1 is fixed on a track support 7 on the table 6 of the CNC broach grinding machine, and a set of guide rails 1 are symmetrically arranged. The slide 2 is slidably mounted on the guide rail 1. The side of the slide 2 has an integrally formed connecting lug 8. The connecting lug 8 on the slide 2 is fixed to the lower surface of the base 3 by a primary bolt. A telescopic rod connecting seat is fixedly welded to the lower surface of the base 3. 37. The tailstock body 4 is fixed to the base 3 by secondary bolts. The body of the telescopic electric cylinder 5 is fixed to the table 6 of the CNC broach grinding machine, and the telescopic rod of the telescopic electric cylinder 5 is fixedly connected to the telescopic rod connecting seat 37. The slide 2 has a square tube structure and is sleeved on the guide rail 1. An upper air chamber 9 is opened on the upper side of the inner cavity of the slide 2. A primary air guide groove 10 is opened on the side of the upper air chamber 9. A primary air pipe connection port 11 is provided on the side of the primary air guide groove 10. The port 11 is connected to the primary air supply equipment via a primary air supply hose. A primary installation groove 12 is provided on the side of the upper air chamber 9 facing the inner cavity of the slide 2. A primary air float plate 13 is fixedly installed in the primary installation groove 12. Primary air float micropores 14 are evenly provided on the primary air float plate 13. By setting up an air float tailstock structure for CNC broach grinding machine composed of guide rail 1, slide 2, base 3, tailstock body 4 and telescopic electric cylinder 5, and by opening the upper air chamber 9 and the primary installation groove 12 on the slide 2, and installing the primary air float plate 13 in the primary installation groove 12, air is supplied to the upper air chamber 9 through the primary air supply equipment and delivered through the primary air float micropores 14 on the primary air float plate 13. Thus, the gas forms an air film between the guide rail 1 and the slide 2, thereby effectively reducing the running friction resistance of the slide 2, thereby effectively reducing the mechanical wear of the guide rail 1 and the slide 2, improving the service life of the structure, and improving the movement flexibility of the slide 2.

[0019] Example 2: Based on Example 1, a lower air chamber 15 is provided on the lower side of the inner cavity of the slide 2. A set of lower air chambers 15 are symmetrically arranged, and the two lower air chambers 15 are connected by a connecting air passage 16. A secondary air guide groove 17 is provided on the outer side of the lower air chamber 15. A secondary air pipe connection port 18 is provided on the side of the secondary air guide groove 17. The secondary air pipe connection port 18 is connected to the secondary air supply equipment through a secondary air delivery hose. A secondary installation groove 19 is provided on the side of the lower air chamber 15 facing the inner cavity of the slide 2. A secondary air flotation plate 20 is fixedly installed in the secondary installation groove 19. A secondary air flotation micropore 21 is provided on the secondary air flotation plate 20.

[0020] A primary pressure gauge and a secondary pressure gauge are connected to the ports of the primary air pipe connection port 11 and the secondary air pipe connection port 18, respectively. The primary pressure gauge, the secondary pressure gauge, the primary air supply device, and the secondary air supply device are all electrically connected to the PLC control module of the CNC broach grinding machine. The air supply pressure value of the primary air supply device is greater than that of the secondary air supply device.

[0021] Side air chambers 22 are provided on both the left and right side walls of the slide 2. The side air chambers 22 are respectively connected to the corresponding secondary air guide grooves 17 on both sides. A tertiary installation groove 23 is provided on the side of the side air chambers 22 facing the inner cavity of the slide 2. A tertiary air flotation plate 24 is fixedly installed in the tertiary installation groove 23. Tertiary air flotation micropores 25 are evenly provided on the tertiary air flotation plate 24. By opening the lower air chamber 15 and the secondary installation groove 19 on the lower side of the inner cavity of the slide 2, and opening the side air chambers 22 and the tertiary installation grooves 23 on the left and right side walls of the slide 2, and setting the secondary air flotation plate 20 and the tertiary air flotation plate 24 in the secondary installation groove 19 and the tertiary installation groove 23 respectively, it is ensured that an air film can be stably formed on each side of the slide 2, thereby further reducing the running friction resistance of the slide 2.

[0022] Each of the first-stage mounting slot 12, second-stage mounting slot 19, and third-stage mounting slot 23 has a connecting plate slot 26 at its front end. Each connecting plate slot 26 has a first-stage threaded hole 27 at its bottom. Each of the first-stage air flotation plate 13, second-stage air flotation plate 20, and third-stage air flotation plate 24 has an integrally formed connecting plate 29 at its front end. The connecting plates 29 on the first-stage air flotation plate 13, second-stage air flotation plate 20, and third-stage air flotation plate 24 are respectively positioned to correspond to the corresponding connecting plate slots 26. Each connecting plate 29 has a first-stage screw hole 30, which corresponds to the first-stage threaded hole 27. The connecting plate 29 is open to... The primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24 are all positioned in the connecting plate groove 26 by the primary positioning screw. The rear ends of the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24 are all provided with secondary threaded holes 31. The rear ends of the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24 are positioned and connected to the sliding plate 2 by the secondary positioning screw. The setting of the connecting plate 29 and the connecting plate groove 26 can facilitate the positioning and connection of the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24.

[0023] The inner side of the primary air flotation plate 13 is provided with a primary sealing groove 32, the inner side of the secondary air flotation plate 20 is provided with a secondary sealing groove 33, and the inner side of the tertiary air flotation plate 24 is provided with a tertiary sealing groove 34. The primary sealing groove 32, the secondary sealing groove 33, and the tertiary sealing groove 34 are all rectangular frame structures, and rubber sealing gaskets 35 are embedded in the primary sealing groove 32, the secondary sealing groove 33, and the tertiary sealing groove 34. During actual installation, the rubber sealing gaskets 35 in the primary sealing groove 32, the secondary sealing groove 33, and the tertiary sealing groove 34 are all in a compressed state. Through the setting of the primary sealing groove 32, the secondary sealing groove 33, and the tertiary sealing groove 34, the sealing performance at the connection position between the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 2 and the slide block 2 can be effectively improved.

[0024] Example 3: Based on Example 2, a primary air intake groove 36 is provided on the outer side of the primary air flotation plate 13. The primary air intake groove 36 connects to the primary air flotation micropores 14 on the primary air flotation plate 13, and the two ends of the primary air intake groove 36 are respectively located at the two ends of the primary air flotation plate 13. The primary air flotation micropores 14 are arranged in pairs, and the primary air intake grooves 36 in the same group are staggered in a mesh structure. A secondary air intake groove is provided on the outer side of the secondary air flotation plate 20, and a tertiary air intake groove is provided on the outer side of the tertiary air flotation plate 24. The secondary air intake groove is used to guide the secondary air flotation plate. The micropores 21 are connected, and the three-stage air intake groove is used to connect the three-stage air flotation micropores 25. The arrangement of the two-stage and three-stage air intake grooves is the same as that of the one-stage air intake groove 36. By opening the one-stage air intake groove 36, the two-stage air intake groove and the three-stage air intake groove on the outer side of the one-stage air flotation plate 13, the two-stage air flotation plate 20 and the three-stage air flotation plate 24 respectively, and ensuring that the air intake grooves are combined to form a grid structure, the air intake grooves are used to make the airflow better evenly distributed, thereby effectively improving the formation and coverage effect of the air film, and further improving the drag reduction effect of the air film.

[0025] The end faces of the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24 all protrude from the outside of the mounting groove, and the protruding thickness of the primary air flotation plate 13, the secondary air flotation plate 20, and the tertiary air flotation plate 24 all match the depth value of the corresponding air intake groove.

[0026] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. An air-floating tailstock structure for a CNC broach grinding machine, characterized in that: include: Guide rail (1), the guide rail (1) is fixed on the track support (7) on the table (6) of the CNC broach grinding machine, and a set of guide rails (1) are symmetrically arranged; Slide (2), the slide (2) is slidably mounted on the guide rail (1), and the side of the slide (2) is integrally formed with a connecting lug (8). The base (3) has a connecting lug (8) on the slide (2) fixed to the lower surface of the base (3) by a first-level bolt. The lower surface of the base (3) is fixedly welded with a telescopic rod connecting seat (37). Tailstock body (4), which is fixed to the base (3) by secondary bolts; Telescopic electric cylinder (5), the main body of the telescopic electric cylinder (5) is fixed on the table (6) of the CNC broach grinding machine, and the telescopic rod of the telescopic electric cylinder (5) is fixedly connected to the telescopic rod connecting seat (37); The slide (2) has a square tube structure and is mounted on the guide rail (1). An upper air chamber (9) is provided on the upper side of the inner cavity of the slide (2). A first-level air guide groove (10) is provided on the side of the upper air chamber (9). A first-level air pipe connection port (11) is provided on the side of the first-level air guide groove (10). The first-level air pipe connection port (11) is connected to the first-level air supply equipment through a first-level air delivery hose. A first-level installation groove (12) is provided on the side of the upper air chamber (9) facing the inner cavity of the slide (2). A first-level air flotation plate (13) is fixedly installed in the first-level installation groove (12). A first-level air flotation micropore (14) is evenly provided on the first-level air flotation plate (13).

2. The air-floating tailstock structure for a CNC broach grinding machine according to claim 1, characterized in that: A lower air chamber (15) is provided on the lower side of the inner cavity of the slide (2). A set of lower air chambers (15) are symmetrically arranged, and the two lower air chambers (15) are connected by a connecting air channel (16). A secondary air guide groove (17) is provided on the outer side of the lower air chamber (15). A secondary air pipe connection port (18) is provided on the side of the secondary air guide groove (17). The secondary air pipe connection port (18) is connected to the secondary air supply equipment through a secondary air delivery hose. A secondary installation groove (19) is provided on the side of the lower air chamber (15) facing the inner cavity of the slide (2). A secondary air flotation plate (20) is fixedly installed in the secondary installation groove (19). A secondary air flotation micropore (21) is provided on the secondary air flotation plate (20).

3. The air-floating tailstock structure for a CNC broach grinding machine according to claim 2, characterized in that: A primary pressure gauge and a secondary pressure gauge are respectively connected to the ports of the primary air pipe connection port (11) and the secondary air pipe connection port (18). The primary pressure gauge, the secondary pressure gauge, the primary air supply device, and the secondary air supply device are all electrically connected to the PLC control module of the CNC broach grinding machine. The air supply pressure value of the primary air supply device is greater than the air supply pressure value of the secondary air supply device.

4. The air-floating tailstock structure for a CNC broach grinding machine according to claim 2, characterized in that: Side air chambers (22) are provided on both the left and right side walls of the slide (2). The side air chambers (22) are connected to the corresponding secondary air guide grooves (17) on both sides. A tertiary installation groove (23) is provided on the side of the side air chambers (22) facing the inner cavity of the slide (2). A tertiary air flotation plate (24) is fixedly installed in the tertiary installation groove (23). A tertiary air flotation micropore (25) is evenly provided on the tertiary air flotation plate (24).

5. The air-floating tailstock structure for a CNC broach grinding machine according to claim 4, characterized in that: The front ports of the first-level mounting slot (12), the second-level mounting slot (19), and the third-level mounting slot (23) are all provided with connecting plate slots (26). The bottom of the connecting plate slots (26) is provided with first-level threaded holes (27). The front ends of the first-level air flotation plate (13), the second-level air flotation plate (20), and the third-level air flotation plate (24) are all integrally formed with connecting plates (29). The connecting plates (29) on the first-level air flotation plate (13), the second-level air flotation plate (20), and the third-level air flotation plate (24) are respectively provided with corresponding connecting plate slots (26). The connecting plates (29) are provided with first-level screw holes (30). The first-level screw holes (30) are provided with corresponding first-level threaded holes (27). The connecting plates (29) are positioned in the connecting plate slots (26) by first-level positioning screws.

6. The air-floating tailstock structure for a CNC broach grinding machine according to claim 5, characterized in that: The rear ends of the primary air flotation plate (13), the secondary air flotation plate (20), and the tertiary air flotation plate (24) are all provided with secondary threaded holes (31), and the rear end of the slide (2) is provided with secondary screw holes (28). The secondary screw holes (28) are correspondingly provided with the secondary threaded holes (31). The rear ends of the primary air flotation plate (13), the secondary air flotation plate (20), and the tertiary air flotation plate (24) are positioned and connected to the slide (2) by secondary positioning screws.

7. The air-floating tailstock structure for a CNC broach grinding machine according to claim 4, characterized in that: The inner side of the first-stage air flotation plate (13) is provided with a first-stage sealing groove (32), the inner side of the second-stage air flotation plate (20) is provided with a second-stage sealing groove (33), and the inner side of the third-stage air flotation plate (24) is provided with a third-stage sealing groove (34). The first-stage sealing groove (32), the second-stage sealing groove (33), and the third-stage sealing groove (34) are all rectangular frame structures, and rubber sealing gaskets (35) are embedded in the first-stage sealing groove (32), the second-stage sealing groove (33), and the third-stage sealing groove (34). When the first-stage air flotation plate (13), the second-stage air flotation plate (20), and the third-stage air flotation plate (24) are actually installed, the rubber sealing gaskets (35) in the first-stage sealing groove (32), the second-stage sealing groove (33), and the third-stage sealing groove (34) are all in a compressed state.

8. The air-floating tailstock structure for a CNC broach grinding machine according to claim 7, characterized in that: The outer side of the primary air flotation plate (13) is provided with a primary air intake groove (36). The primary air intake groove (36) is connected to the primary air flotation micropores (14) on the primary air flotation plate (13). The two ends of the primary air intake groove (36) are located at the two ends of the primary air flotation plate (13). The primary air flotation micropores (14) are arranged in groups of two. The primary air intake grooves (36) in the same group are staggered in a grid structure.

9. The air-floating tailstock structure for a CNC broach grinding machine according to claim 8, characterized in that: The outer side of the secondary air flotation plate (20) is provided with a secondary air intake groove, and the outer side of the tertiary air flotation plate (24) is provided with a tertiary air intake groove. The secondary air intake groove is used to connect the secondary air flotation micropores (21), and the tertiary air intake groove is used to connect the tertiary air flotation micropores (25). The arrangement of the secondary and tertiary air intake grooves is the same as that of the primary air intake groove (36).

10. The air-floating tailstock structure for a CNC broaching grinder according to claim 9, characterized in that: The end faces of the first-stage air flotation plate (13), the second-stage air flotation plate (20), and the third-stage air flotation plate (24) all protrude outside the mounting groove, and the protruding thickness of the first-stage air flotation plate (13), the second-stage air flotation plate (20), and the third-stage air flotation plate (24) all match the depth value of the corresponding air intake groove.

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