A hollow motor direct-drive ejector pin drilling structure

Abstract

This invention belongs to the field of cutting machine technology, specifically referring to a hollow motor direct-drive ejector pin drilling structure. It includes a frame, an assembly plate on the side of the frame, a cylinder and a guide sleeve (two in number), and a guide rod sliding inside each guide sleeve. The piston rod of the cylinder and the lower end of the guide rod are connected to an mounting plate. A hollow motor is mounted on the mounting plate, and a chuck assembly is connected to the lower end of the hollow rotating shaft. A guide sleeve fixing seat is connected between the two guide sleeves, and a push rod is mounted on the guide sleeve fixing seat, extending through the hollow rotating shaft into the hollow drill. This invention features good structural stability, high processing accuracy, long service life, simple structure, stable transmission, and is less prone to failure. It is also inexpensive, effectively saving costs. The hollow drill is easy and quick to assemble and disassemble, saving time and effort. Furthermore, its compact structure prevents interference with the cutter head, and the large space between the hollow drill and the moving plate facilitates the replacement of the cutting blades and hollow drill in the cutter head, making it suitable for automatic cutting machines.

Description

Technical fields:

[0001] This invention belongs to the field of cutting bed technology, specifically referring to a hollow motor direct-drive ejector pin drilling structure. Background technology:

[0002] Automatic cutting machines are cutting equipment used to cut fabrics and are widely used in industries such as garment manufacturing and automotive seat manufacturing. During cutting, some fabric patterns require positioning and punching, and since the fabric pieces are relatively thick, a lot of waste material will clog the drill bit after one punch, making continuous punching impossible. Therefore, ejector pins are installed to push out the waste material from the punch holes.

[0003] Chinese invention patent (publication number CN107471309A, application date 2017.08.19, publication date 2017.12.15) discloses a hollow drill mechanism for an automatic cutting bed, comprising a frame; a driver is mounted on the frame, the driver including a movable part that can be raised and lowered, a motor mounted on the movable part and able to rise and fall with the movable part, the motor being connected to the hollow drill through a transmission mechanism, the motor driving the transmission mechanism to rotate the hollow drill, the lower end of the hollow drill being a drilling cutting edge. A motor bracket is mounted on the movable part of the driver, and the motor is mounted on the motor bracket. A mounting plate is mounted on the motor bracket, and the transmission mechanism is mounted on the mounting plate. The transmission mechanism includes a driving gear and a driven gear, the driving gear being connected to the rotating shaft of the motor and driven to rotate by the motor, the driven gear meshing with the driving gear, one end of the driven gear shaft being rotatably mounted on the mounting plate, and the other end being connected to the hollow drill, the driven gear shaft being a hollow shaft. One end of the driven gear's gear shaft is rotatably mounted on the mounting plate, and the other end is connected to the hollow drill. The driven gear's gear shaft is hollow. The upper end of the hollow drill is inserted into the lower part of the driven gear's gear shaft and fixed by radially arranged set screws. The motor is a pneumatic motor equipped with a silencer. A connecting plate is provided on the frame, and a push rod is provided at the outer end of the connecting plate. The push rod is located above the hollow drill and can extend into the hollow drill to push out waste material located inside the hollow drill. In addition to the gear transmission mechanism described above, the transmission mechanism can also be replaced by a synchronous belt transmission mechanism, a chain transmission mechanism, etc.

[0004] The shortcomings of the hollow drill mechanism used in automatic cutting machines are as follows: 1. The rotating shaft of the pneumatic motor is connected to the hollow drill through the transmission mechanism. The rotating shaft and the hollow drill axis are not on the same straight line, resulting in poor structural stability. The hollow drill is subjected to uneven force during operation, which leads to low processing accuracy, short service life, complex structure, unstable transmission, and easy failure. 2. The pneumatic motor is expensive, which is not conducive to reducing production costs. 3. The hollow drill is fixed to the gear shaft of the driven gear by the set screw. Replacing the hollow drill is troublesome, time-consuming and labor-intensive.

[0005] Chinese utility model patent (publication number CN220762904U, application date 2023.07.27, publication date 2024.04.12) discloses an anti-clogging drilling mechanism, including a hollow shaft motor, a hollow drill bit, an L-shaped base, a linear guide rail, a cylinder, and a push rod; a tool pad is provided on the horizontal part of the L-shaped base, and a push rod fixing plate, a linear guide rail, and a cylinder are mounted on the vertical part; the hollow shaft motor is fixed to a slider on the linear guide rail through a motor fixing seat, and the cylinder is connected to the motor fixing seat through a floating joint; the hollow shaft motor and the hollow drill bit are connected through a hollow connecting sleeve; the upper end of the push rod is fixedly mounted on the push rod fixing plate, and the lower end passes through the hollow shaft motor, the hollow connecting sleeve, and the hollow drill bit and extends out of the drill bit; the tool pad is located directly below the hollow drill bit. Although it discloses a hollow shaft motor, with the upper end of the push rod fixedly mounted on the push rod fixing plate and the lower end passing through the hollow shaft motor, hollow connecting sleeve and hollow drill bit and extending out of the drill bit, its layout is not compact enough, occupies a lot of space, and the cylinder set between the hollow drill bit and the L-shaped base will interfere with the cutter head set under the frame. Therefore, its structure cannot be directly applied to automatic cutting machines. Summary of the Invention:

[0006] The purpose of this invention is to provide a hollow motor direct-drive pin drilling structure, which has good structural stability, uniform force distribution during operation, high machining accuracy, long service life, simple structure, stable transmission, and is not prone to failure; at the same time, it is inexpensive, effectively saving costs; the hollow drill is easy and quick to assemble and disassemble, saving time and effort, and is easy to maintain; at the same time, the structure is compact and will not interfere with the cutter head located below the frame, and the space between the hollow drill and the moving plate is large, which facilitates the replacement of the cutting blade and hollow drill in the cutter head, making it suitable for automatic cutting machines.

[0007] This invention is implemented as follows:

[0008] A hollow motor direct-drive ejector drill structure includes a frame with an assembly plate on its side. A cylinder and two guide sleeves are mounted on the assembly plate. The cylinder is located between the two guide sleeves. A guide rod slides inside each guide sleeve. The piston rod of the cylinder and the lower end of the guide rod are connected to an mounting plate. A hollow motor is mounted on the mounting plate. A chuck assembly is connected to the lower end of the hollow shaft of the hollow motor. A hollow drill coaxial with the hollow shaft is mounted on the chuck assembly. A guide sleeve fixing seat is connected between the two guide sleeves. A push rod for ejecting waste material inside the hollow drill is mounted on the guide sleeve fixing seat. The push rod passes through the hollow shaft and extends into the hollow drill. The hollow drill, the chuck assembly includes a chuck body connected to a hollow rotating shaft at its upper end, a sleeve fitted outside the chuck body, and an elastic element that causes the sleeve to move downwards. The upper end of the hollow drill is inserted into the chuck body, which has a through hole for a push rod to pass through. The lower end of the chuck body has a lower limiting platform for limiting the lower position of the sleeve. The side wall of the chuck body has a receiving through hole, in which a ball bearing is placed. The inner side of the sleeve has a limiting block. When the sleeve is in its lowest position, the limiting block limits the ball bearing in the locking hole of the hollow drill, and the hollow drill is fixed relative to the chuck body. When the sleeve is moved upwards and the limiting block moves away from the ball bearing, the hollow drill can slide relative to the chuck body.

[0009] In the above-mentioned hollow motor direct-drive ejector pin drilling structure, the limiting block is annular, and the lower surface of the limiting block is a conical surface with a smaller diameter at the top and a larger diameter at the bottom.

[0010] In the above-mentioned hollow motor direct-drive ejector pin drilling structure, the chuck body is provided with an upper limit platform located above the lower limit platform, and the elastic element is a compression spring fitted outside the chuck body. The upper end of the compression spring abuts against the upper limit platform and the lower end abuts against the limit block.

[0011] In the above-mentioned hollow motor direct-drive pin drilling structure, the elastic element can also be a tension spring or a leaf spring.

[0012] In the above-mentioned hollow motor direct-drive ejector pin drilling structure, the upper limit platform can be a nut screwed onto the chuck body or a protruding edge integrally formed with the chuck body; the lower limit platform can be a nut screwed onto the chuck body or a protruding edge integrally formed with the chuck body.

[0013] In the above-mentioned hollow motor direct-drive pin drilling structure, there are multiple locking holes evenly distributed around the circumference, and correspondingly, there are multiple accommodating through holes and locking holes evenly distributed around the circumference.

[0014] In the above-mentioned hollow motor direct-drive pin drilling structure, the hollow motor is located above the mounting plate, the upper end of the chuck body passes through the mounting plate and is connected to the coupling, and the lower end of the hollow shaft is connected to the coupling.

[0015] In the above-mentioned hollow motor direct-drive ejector drill structure, a bearing fitted outside the chuck body is provided between the chuck body and the mounting plate.

[0016] In the above-mentioned hollow motor direct drive pin drilling structure, the lower end of the hollow rotating shaft is inserted into the upper end of the coupling, the upper end of the chuck body is inserted into the lower end of the coupling, and notches are provided on the upper and lower side walls of the coupling, which are respectively locked by locking screws.

[0017] In the above-mentioned hollow motor direct-drive pin drilling structure, a hollow connecting flange is provided between the hollow motor and the mounting plate, and the coupling is disposed inside the connecting flange.

[0018] In the above-mentioned hollow motor direct drive ejector pin drilling structure, the guide sleeve fixing seat protrudes towards the hollow motor side and forms a groove for avoiding the cylinder on the side away from the hollow motor. The guide sleeve fixing seat is provided with an ejector pin fixing seat, and the upper end of the ejector rod is connected to the ejector pin fixing seat.

[0019] In the above-mentioned hollow motor direct-drive pin drilling structure, a bearing is provided between the guide sleeve and the guide rod, and the bearing is fitted on the guide rod.

[0020] In the above-mentioned hollow motor direct-drive ejector pin drilling structure, an mounting sleeve is fixedly fastened to the ejector pin fixing seat by ball screws, the ejector rod is screwed into the mounting sleeve, and the upper end extends out of the mounting sleeve to connect the handle.

[0021] In the above-mentioned hollow motor direct-drive pin drilling structure, a pressure block is provided below the mounting plate, and guide rods are provided at both ends of the pressure block. The two guide rods are located on both sides of the hollow drill. A reset spring is provided between the mounting plate and the pressure block and is fitted on the guide rods. The upper end of the guide rod is slidably disposed in the mounting plate. At least one guide rod passes through the mounting plate and connects to a stop block. A reset spring is provided between the stop block and the mounting plate and is fitted on the guide rod.

[0022] In the above-mentioned hollow motor direct drive pin drilling structure, the mounting plate is provided with two guide sleeves, and the guide rod is slidably disposed in the corresponding guide sleeve. A bearing is provided between the guide sleeve and the guide rod, and the upper end of the return spring abuts against the corresponding bearing. The lower end of the return spring abuts against the corresponding bearing.

[0023] In the above-mentioned hollow motor direct-drive pin drilling structure, the pressure block is provided with a guide sleeve to guide the hollow drill.

[0024] The outstanding advantages of this invention compared to the prior art are:

[0025] 1. This invention features a hollow motor, with the hollow drill directly connected to the lower end of the hollow motor's hollow shaft. A push rod extends through the hollow shaft into the hollow drill. The hollow shaft and hollow drill are coaxially aligned, resulting in good structural stability. The hollow drill experiences uniform force during operation, achieving high machining accuracy and a long service life. Furthermore, the simple structure and stable transmission reduce the likelihood of malfunctions. The use of a hollow motor drive is inexpensive, effectively saving costs. The hollow drill is connected to the lower end of the hollow shaft via a chuck assembly, allowing for quick replacement of the drill by moving the sleeve. This convenient and quick assembly and disassembly saves time and effort, facilitates maintenance, and adapts to scenarios requiring frequent drill replacement, thus significantly improving cutting efficiency. The cylinder and guide sleeve of this invention are both located above the mounting plate on the side of the frame, resulting in a compact structure that avoids interference with the cutter head located below the frame. The ample space between the hollow drill and the moving plate facilitates the replacement of the cutting blades and hollow drill within the cutter head, making it suitable for automatic cutting machines.

[0026] 2. The limiting block of the present invention is annular, and the lower surface of the limiting block is a conical surface with a smaller diameter at the top and a larger diameter at the bottom, which facilitates the downward movement of the sleeve and the reset of the ball bearings;

[0027] 3. The ejector pin fixing seat of the present invention is fixed with an installation sleeve by ball screws. The ejector pin is screwed into the installation sleeve and the upper end extends out of the installation sleeve to connect the handle, which can realize quick assembly and disassembly of the ejector pin and adjust the length of the ejector pin extending into the hollow drill. Attached image description:

[0028] Figure 1 This is the three-dimensional representation of the present invention. Figure 1 ;

[0029] Figure 2 This is the three-dimensional representation of the present invention. Figure 2 ;

[0030] Figure 3 This is a cross-sectional view of the frameless design of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point A.

[0032] Reference numerals: 1. Frame; 2. Mounting plate; 3. Hollow motor; 4. Hollow shaft; 5. Hollow drill; 6. Push rod; 7. Chuck body; 8. Sleeve; 9. Elastic element; 10. Lower limit platform; 11. Through hole; 12. Ball bearing; 13. Limit block; 14. Conical surface; 15. Upper limit platform; 16. Coupling; 17. Connecting flange; 18. Cylinder; 19. Guide sleeve one; 20. Guide rod one; 21. Push pin fixing seat; 22. Pressing block; 23. Guide rod two; 24. Return spring one; 25. Stop block; 26. Return spring two; 27. Guide sleeve two; 28. Ball screw; 29. ​​Mounting sleeve; 30. Handle; 31. Guide sleeve fixing seat; 32. Guide sleeve; 33. Assembly plate. Detailed implementation method:

[0033] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —4:

[0034] A hollow motor direct-drive ejector drill structure includes a frame 1. An assembly plate 33 is provided on the side of the frame 1. A cylinder 18 and guide sleeves 19 are provided above the assembly plate 33. Two guide sleeves 19 are provided, with the cylinder 18 located between the two guide sleeves 19. A guide rod 20 slides inside each guide sleeve 19. The piston rod of the cylinder 18 and the lower ends of the guide rod 20 are connected to an mounting plate 2. A hollow motor 3 is provided on the mounting plate 2. A chuck assembly is connected to the lower end of the hollow shaft 4 of the hollow motor 3. A hollow drill 5 coaxial with the hollow shaft 4 is provided on the chuck assembly. A guide sleeve fixing seat 31 is connected between the two guide sleeves 19. A push rod 6 for ejecting waste material located inside the hollow drill 5 is provided on the guide sleeve fixing seat 31. The push rod 6 extends through the hollow shaft 4 and into... The hollow drill 5 includes a chuck assembly comprising a chuck body 7 connected at its upper end to a hollow rotating shaft 4, a sleeve 8 fitted outside the chuck body 7, and an elastic element 9 that causes the sleeve 8 to move downwards. The upper end of the hollow drill 5 is inserted into the chuck body 7, which has a through hole for the push rod 6 to pass through. The lower end of the chuck body 7 has a lower limiting platform 10 for limiting the lower position of the sleeve 8. The side wall of the chuck body 7 has a receiving through hole 11, in which a ball bearing 12 is disposed. The inner side of the sleeve 8 has a limiting block 13. When the sleeve 8 is in its lowest position, the limiting block 13 limits the ball bearing 12 in the locking hole of the hollow drill 5, and the hollow drill 5 is fixed relative to the chuck body 7. When the sleeve 8 is moved upwards and the limiting block 13 moves away from the ball bearing 12, the hollow drill 5 can slide relative to the chuck body 7.

[0035] The working principle of this invention is as follows: Figure 1-4 As shown, the existing CNC control system of the cutting machine is running, controlling the hollow shaft 4 of the hollow motor 3 to rotate, which drives the chuck assembly and the hollow drill 5 to rotate. When the cylinder 18 drives the mounting plate 2 to move downward to drill, the push rod 6 remains stationary. After drilling is completed, the cylinder 18 drives the mounting plate 2 to move upward, driving the chuck assembly and the hollow drill 5 to move upward. The push rod 6 pushes out the waste material inside the hollow drill 5, greatly improving the drilling efficiency. The guide rod 20 and the guide sleeve 19 guide the vertical sliding of the mounting plate 2, so that the mounting plate 2 can move vertically smoothly.

[0036] The clamping process of the chuck assembly of the present invention is as follows: the sleeve 8 is moved upward, the elastic element 9 undergoes elastic deformation, the limiting block 13 moves away from the ball 12, and after the hollow drill 5 is inserted, the sleeve 8 is released. Under the elastic force of the elastic element 9, the sleeve 8 moves downward until it abuts against the lower limiting platform 10 and is in the lowest position. The limiting block 13 pushes the ball 12 to move into the chuck body 7 until the ball 12 is engaged in the locking hole of the hollow drill 5 and the ball 12 is limited in the locking hole. The hollow drill 5 is fixed relative to the chuck body 7, and the installation is completed. When it is necessary to remove the hollow drill 5, the sleeve 8 is moved upward, the limiting block 13 moves away from the ball 12, and the hollow drill 5 can slide relative to the chuck body 7 to remove the hollow drill 5.

[0037] like Figure 1-4 As shown, this invention features a hollow motor 3, with a hollow drill 5 directly connected to the lower end of the hollow shaft 4 of the hollow motor 3. A push rod 6 extends through the hollow shaft 4 into the hollow drill 5. The hollow shaft 4 and the hollow drill 5 are coaxially aligned, resulting in good structural stability. The hollow drill 5 experiences uniform force during operation, achieving high machining accuracy and a long service life. Furthermore, the structure is simple, transmission is stable, and it is less prone to failure. Simultaneously, the use of a hollow motor drive is inexpensive, effectively saving costs. The hollow drill is connected to the lower end of the hollow shaft 4 via a chuck assembly, allowing for easy movement. The sleeve 8 allows for quick replacement of the hollow drill 5. The hollow drill 5 is easy and quick to assemble and disassemble, saving time and effort, and is easy to maintain. It can adapt to scenarios where the hollow drill 5 needs to be frequently replaced, thereby greatly improving cutting efficiency. The cylinder 18 and guide sleeve 19 of this invention are both located above the assembly plate 33 on the side of the frame 1. The structure is compact and will not interfere with the cutter head located below the frame 1. Moreover, the space between the hollow drill 5 and the moving plate is large, which facilitates the replacement of the cutting blade and the hollow drill 5 in the cutter head. It is suitable for automatic cutting beds.

[0038] To ensure that the ball bearing 12 does not completely leave the receiving through hole 11 when the sleeve 8 moves upward, and to facilitate the return of the ball bearing 12 to its original position when the sleeve 8 moves downward, such as... Figure 3 , 4 As shown, the limiting block 13 is annular, and the lower surface of the limiting block 13 is a conical surface 14 with a smaller diameter at the top and a larger diameter at the bottom. During the downward movement of the sleeve 8, the conical surface 14 gradually pushes the ball 12 into the chuck body 7, which facilitates the downward movement of the sleeve 8.

[0039] The structure of elastic element 9: as follows Figure 3 , 4 As shown, the chuck body 7 is provided with an upper limit platform 15 located above the lower limit platform 10. The elastic element 9 is a compression spring fitted outside the chuck body 7. The upper end of the compression spring abuts against the upper limit platform 15, and the lower end abuts against the limit block 13. The structure is simple and easy to install.

[0040] Furthermore, the upper limit platform 15 can be a nut screwed onto the outside of the chuck body 7, or it can be a protruding edge integrally formed with the chuck body 7; the lower limit platform 10 can be a nut screwed onto the outside of the chuck body 7, or it can be a protruding edge integrally formed with the chuck body 7. In this embodiment, the upper limit platform 15 is a nut screwed onto the outside of the chuck body 7, and the lower limit platform 10 is a protruding edge integrally formed with the chuck body 7.

[0041] Preferably, there are multiple locking holes evenly distributed around the circumference, and correspondingly, there are multiple accommodating through holes 11 and locking holes evenly distributed around the circumference.

[0042] Installation structure of the chuck body 7 and the hollow rotating shaft 4: The hollow motor 3 is located above the mounting plate 2, the upper end of the chuck body 7 passes through the mounting plate 2 and is connected to the coupling 16, and the lower end of the hollow rotating shaft 4 is connected to the coupling 16.

[0043] Furthermore, a bearing fitted outside the chuck body 7 is provided between the chuck body 7 and the mounting plate 2.

[0044] The installation structure of the hollow shaft 4 and the coupling 16, and the chuck body 7 and the coupling 16: The lower end of the hollow shaft 4 is inserted into the upper end of the coupling 16, and the upper end of the chuck body 7 is inserted into the lower end of the coupling 16. Notches are provided on the upper and lower side walls of the coupling 16, and they are locked by locking screws respectively.

[0045] To ensure the stability of the hollow motor 3 installation structure, a hollow connecting flange 17 is provided between the hollow motor 3 and the mounting plate 2, and the coupling 16 is disposed inside the connecting flange 17.

[0046] To make the structure more compact: such as Figure 1-3 As shown, the guide sleeve fixing seat 31 protrudes towards the hollow motor 3 and forms a groove for avoiding the cylinder 18 on the side away from the hollow motor 3. The guide sleeve fixing seat 31 is provided with a push pin fixing seat 21, and the upper end of the push rod 6 is connected to the push pin fixing seat 21.

[0047] Furthermore, a bearing fitted on the guide rod 20 is provided between the guide sleeve 19 and the guide rod 20.

[0048] To facilitate quick assembly and disassembly of the push rod 6 and adapt to scenarios requiring frequent replacement of the hollow drill 5, thereby greatly improving cutting efficiency, a mounting sleeve 29 is secured to the push rod fixing seat 21 by a ball screw 28. The push rod 6 is screwed into the mounting sleeve 29, with its upper end extending out of the mounting sleeve 29 to connect to the handle 30. By rotating and adjusting the position of the push rod 6 relative to the mounting sleeve 29, the length of the push rod 6 extending into the hollow drill 5 can be adjusted.

[0049] Furthermore, a fabric pressing block 22 is provided below the mounting plate 2. Guide rods 23 are provided at both ends of the fabric pressing block 22, located on either side of the hollow drill 5. A return spring 24 is fitted onto the guide rod 23 between the mounting plate 2 and the fabric pressing block 22. The upper end of the guide rod 23 slides within the mounting plate 2. At least one guide rod 23 has its upper end passing through a connecting block 25 on the mounting plate 2. A return spring 26 is fitted onto the guide rod 23 between the block 25 and the mounting plate 2. When the mounting plate 2 moves downward, it causes the fabric pressing block 22 to move downward until it presses onto the fabric, compressing the return spring 24. The mounting plate 2 and the hollow drill 5 continue to move downward to drill holes in the fabric. After drilling, the mounting plate 2 moves upward, compressing the return spring 26 until the elastic force of the return spring 26 can move the fabric pressing block 22 upward. The mounting plate 2 then moves upward, causing the fabric pressing block 22 to move upward as well.

[0050] To better guide the drilling of the hollow drill bit 5, such as Figure 1-3 As shown, the mounting plate 2 is provided with two guide sleeves 27, and the guide rod 23 is slidably disposed in the corresponding guide sleeve 27. A bearing is provided between the guide sleeve 27 and the guide rod 23, which is fitted on the guide rod 23. The upper end of the return spring 24 abuts against the corresponding bearing, and the lower end of the return spring 26 abuts against the corresponding bearing.

[0051] Preferably, the pressure block 22 is provided with a guide sleeve 32 for guiding the hollow drill 5.

[0052] The above embodiments are merely one of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes made in accordance with the shape, structure and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A hollow motor direct-drive pin drilling structure, comprising a frame (1), characterized in that: The frame (1) has an assembly plate (33) on its side. Above the assembly plate (33) are a cylinder (18) and a guide sleeve (19). There are two guide sleeves (19). The cylinder (18) is located between the two guide sleeves (19). A guide rod (20) slides inside the guide sleeve (19). The piston rod of the cylinder (18) and the lower end of the guide rod (20) are connected to the mounting plate (2). A hollow motor (3) is provided on the mounting plate (2). The lower end of the hollow shaft (4) of the hollow motor (3) is connected to a chuck assembly. A hollow drill (5) coaxial with the hollow shaft (4) is provided on the chuck assembly. A guide sleeve fixing seat (31) is connected between two guide sleeves (19). The guide sleeve fixing seat (31) is provided with a push rod (6) for ejecting the waste material located in the hollow drill (5). The push rod (6) passes through the hollow rotating shaft (4) and extends into the hollow drill (5). The chuck assembly includes a chuck body (7) with its upper end connected to the hollow rotating shaft (4), a sleeve (8) fitted outside the chuck body (7), and an elastic element (9) that causes the sleeve (8) to move downward due to elasticity. The upper end of the hollow drill (5) is inserted into the chuck body (7). The chuck body (7) is provided with a through hole for the push rod (6) to pass through. The lower end of the chuck body (7) is provided with A lower limiting platform (10) is provided for lowering the sleeve (8). The side wall of the chuck body (7) is provided with a receiving through hole (11), and a ball bearing (12) is provided in the receiving through hole (11). A limiting block (13) is provided on the inner side of the sleeve (8). When the sleeve (8) is in the lowest position, the limiting block (13) limits the ball bearing (12) in the locking hole of the hollow drill (5), and the hollow drill (5) is fixed relative to the chuck body (7). When the sleeve (8) is moved up and the limiting block (13) leaves the ball bearing (12), the hollow drill (5) can slide relative to the chuck body (7). The hollow motor (3) is located on the mounting plate (2). Above, the upper end of the chuck body (7) passes through the mounting plate (2) and connects to the coupling (16). The lower end of the hollow shaft (4) is connected to the coupling (16). A hollow connecting flange (17) is provided between the hollow motor (3) and the mounting plate (2). The coupling (16) is set inside the connecting flange (17). The guide sleeve fixing seat (31) protrudes towards the hollow motor (3) and forms a groove for the avoidance cylinder (18) on the side away from the hollow motor (3). A pin fixing seat (21) is provided on the guide sleeve fixing seat (31). The upper end of the push rod (6) is connected to the pin fixing seat (21).

2. The hollow motor direct-drive ejector pin drilling structure according to claim 1, characterized in that: The limiting block (13) is annular, and the lower surface of the limiting block (13) is a conical surface (14) with a smaller diameter at the top and a larger diameter at the bottom.

3. The hollow motor direct-drive ejector pin drilling structure according to claim 2, characterized in that: The clamp body (7) is provided with an upper limit platform (15) located above the lower limit platform (10). The elastic element (9) is a compression spring fitted outside the clamp body (7). The upper end of the compression spring abuts against the upper limit platform (15) and the lower end abuts against the limit block (13).

4. The hollow motor direct-drive ejector pin drilling structure according to claim 1, characterized in that: The mounting sleeve (29) is locked and fixed on the ejector pin fixing seat (21) by ball screws (28). The ejector rod (6) is screwed into the mounting sleeve (29) and its upper end extends out of the mounting sleeve (29) to connect to the handle (30).

5. The hollow motor direct-drive ejector pin drilling structure according to claim 1, characterized in that: The mounting plate (2) is provided with a pressure block (22) below it. The two ends of the pressure block (22) are respectively provided with guide rods (23). The two guide rods (23) are located on both sides of the hollow drill (5). The mounting plate (2) and the pressure block (22) are provided with a reset spring (24) fitted on the guide rod (23). The upper end of the guide rod (23) slides inside the mounting plate (2). At least one guide rod (23) has its upper end passing through the mounting plate (2) and connecting block (25). The block (25) and the mounting plate (2) are provided with a reset spring (26) fitted on the guide rod (23).

6. The hollow motor direct-drive ejector pin drilling structure according to claim 5, characterized in that: The mounting plate (2) is provided with two guide sleeves (27), and guide rods (23) slide in the corresponding guide sleeves (27). A bearing is provided between the guide sleeves (27) and the guide rods (23), and the upper end of the reset spring (24) abuts against the corresponding bearing. The lower end of the reset spring (26) abuts against the corresponding bearing.

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