A vertical cradle five-axis turning and milling combined machine tool's thimble structure

Abstract

The present application belongs to the technical field of machine tool equipment, and in particular to a top pin structure of a vertical cradle five-axis turning and milling combined machine tool, comprising a machine tool, wherein the base of the machine tool is arranged in a U shape with the opening direction facing upwards. The structure, by arranging the top pin mechanism, significantly improves the accuracy and motion stability of the top pin pressure adjustment, the rolling contact design of the main and auxiliary balls greatly reduces the friction loss in the force transmission process, and the fine adjustment of the top pin pressure can be realized through the threaded transmission of the threaded rod, meeting the pressing needs of different material rods; the pre-compression structure of the spring provides stable pre-tightening force and realizes fast resetting of the top pin, avoiding jamming; the design of the guide sleeve and the hard alloy contact end limits the radial swing of the top pin, ensures the coaxiality of the top pin and the material rod, reduces the machining eccentricity error, and on the other hand, enhances the wear resistance of the top pin and prolongs the service life; the overall structure makes the top pin bear force evenly, effectively avoids the displacement of the material rod under pressure, and improves the workpiece size accuracy.

Description

Technical Field

[0001] This invention relates to the field of machine tool equipment technology, and in particular to a pin structure for a vertical cradle five-axis turning and milling composite machine tool. Background Technology

[0002] Vertical cradle five-axis turning and milling composite machine tools, with their five-axis linkage machining capabilities, high cutting accuracy, and adaptability to complex workpieces, have been widely used in high-end manufacturing fields such as aerospace, precision machinery, and mold manufacturing. The ejector pin structure, as the core clamping and positioning component of this type of machine tool, directly undertakes the functions of axial positioning and stability assurance for the material bar; its performance directly affects the dimensional accuracy, surface quality, and machining efficiency of the workpiece.

[0003] However, the ejector pin structure of existing vertical cradle five-axis turning and milling composite machine tools still has many technical defects in practical applications:

[0004] 1. Insufficient adjustability: The angle adjustment of traditional ejector structures mostly relies on manual or simple mechanical transmission, resulting in low angle control accuracy and slow response, making it difficult to match the multi-directional and highly dynamic cutting requirements in five-axis machining; at the same time, the position adjustment mechanism of the ejector seat has a narrow range of adaptability and cannot flexibly adapt to material bars of different lengths and diameters, resulting in poor versatility.

[0005] 2. Poor clamping stability: Most existing chucks use rigid jaws to directly clamp the material bar, resulting in a small contact area and insufficient friction. This causes the material bar to slip or become eccentric during high-speed rotation or vibration, leading to coaxiality errors. Although some structures have added anti-slip structures, they are mostly fixed in shape and cannot be adapted to materials with different outer diameters. They are also prone to causing damage to the material surface.

[0006] 3. Insufficient adjustment of ejector pin pressure and smoothness of movement. Traditional ejector pin pressure adjustment is mostly achieved by directly applying pressure through a single thread transmission. The friction loss during force transmission is large, which can easily lead to problems such as adjustment jamming and uneven pressure distribution. This causes the material bar to deviate under pressure, affecting the machining accuracy. At the same time, there is a lack of effective guiding and lubrication structure between the ejector pin and the mounting hole, resulting in a large radial swing, which further aggravates the machining error.

[0007] 4. Insufficient reliability of ejector pin holder. Most existing ejector pin holders use a single pin or bolt for locking. Under the vibration and impact generated by the high-speed operation of the machine tool, they are prone to loosening and displacement, which can damage the coaxiality of the ejector pin and the material bar and cause processing failures.

[0008] To address the above problems, this invention proposes a pin structure for a vertical cradle five-axis turning and milling composite machine tool. Summary of the Invention

[0009] Based on the technical problems of existing composite machine tool ejector pin structures in terms of material clamping adaptability, processing stability and pressure adjustment accuracy, this invention proposes an ejector pin structure for a vertical cradle five-axis turning and milling composite machine tool.

[0010] The present invention proposes a pin structure for a vertical cradle five-axis turning and milling composite machine tool, including a machine tool. The base of the machine tool is configured as a U-shape with the opening direction facing upward. An adjustment mechanism is provided at one end of the machine tool base. A pin mechanism is provided at one end of the adjustment mechanism. A pin is provided at the lower end of the pin mechanism. A plug-in mechanism is provided on one side of the adjustment mechanism. A material bar is provided at the upper end of the adjustment mechanism. The lower end of the pin is pressed and connected to the upper end of the material bar.

[0011] The adjustment mechanism includes a hydraulic motor embedded in one end of the machine tool base. The output shaft of the hydraulic motor is rotatably connected to a U-shaped frame. One end of the U-shaped frame is fixedly connected to a fixed bracket. A dovetail guide rail is fixedly connected to the upper side of the fixed bracket. Slots are arrayed on the side of the dovetail guide rail. A pin seat is slidably connected to the surface of the dovetail guide rail.

[0012] A second hydraulic motor is embedded in the middle of the U-shaped frame. A fixed ring is fixedly connected to the U-shaped surface of the U-shaped frame. A rotating disk is fixedly connected to the output shaft end of the second hydraulic motor. The lower end of the rotating disk is rotatably connected to the surface of the fixed ring. A chuck is fixedly connected to the center of the upper end of the rotating disk. The chuck's claws are clamped and connected to the lower end of the material bar.

[0013] Preferably, the ejector pin mechanism includes a connector, the lower end of which has a circumferential array of steel ball holes, and the connector has a threaded hole in the vertical direction. The lower end of the threaded hole has a mounting hole, the inner wall of which is fixedly connected to the inner wall of the steel ball holes. A threaded rod is threadedly connected to the inner wall of the threaded hole, and a main ball is press-fitted to the lower end of the threaded rod. A secondary ball is disposed inside the steel ball holes, the surface of which is in contact with the surface of the main ball, and the surface of which is press-fitted to the upper end of the ejector pin. A spring is slidably sleeved on the upper surface of the ejector pin, the upper end of which is fixedly connected to the upper end of the ejector pin, and the lower end of which is fixedly connected to the inner bottom wall of the mounting hole.

[0014] Preferably, one end of the ejector pin seat is provided with a limiting groove adapted to the auxiliary ball, and both sides of one end of the ejector pin seat are respectively provided with insertion holes adapted to the slot.

[0015] Preferably, the insertion mechanism includes a limiting component that slides into the inner wall of the slot. One end of the limiting component is slidably inserted with a fixing member. A limiting insertion hole is formed in the vertical direction of the fixing member body. A limiting rod is inserted into the inner wall of the limiting insertion hole. One end of the limiting component is provided with a fixing hole that matches the limiting rod. The upper end of the limiting rod is threaded. The upper end of the limiting rod passes through the limiting component and is threaded with a nut.

[0016] Preferably, the lower end of the limiting rod is provided with a mounting groove, the inner wall of the mounting groove is elastically hinged with a conical gasket, the lower surface of the conical gasket is tightly fitted with the limiting block, and the lower end of the limiting block is fixedly connected to the inner wall of the mounting groove.

[0017] Preferably, the tapered gasket is located between the fixing member and the ejector pin seat.

[0018] Preferably, the lower contact end of the ejector pin is made of hard alloy material, and a guide sleeve is provided between the outer wall of the ejector pin and the inner wall of the mounting hole, with the inner wall of the guide sleeve slidingly fitting against the outer wall of the ejector pin.

[0019] Preferably, each jaw of the chuck is provided with an arc-shaped anti-slip pad on its inner wall, the surface of the arc-shaped anti-slip pad is provided with an array of anti-slip patterns, and the arc-shaped anti-slip pad is made of elastic and wear-resistant rubber material.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. By setting up an adjustment mechanism, dual optimization of the material bar processing angle and clamping adaptation is achieved. Hydraulic motor one drives the U-shaped frame to achieve cradle-type angle adjustment, accurately matching the multi-directional cutting requirements in five-axis machining, with high angle adjustment accuracy and stable operation; hydraulic motor two, together with the fixed ring and rotating disk, drives the material bar to rotate at high speed with uniform friction, ensuring the stability of turning processing; the trapezoidal structure and array slot design of the dovetail guide rail not only achieves reliable sliding of the ejector pin seat, but also adapts to material bars of different lengths, improving the versatility of the mechanism; the arc-shaped anti-slip pad on the inner wall of the chuck increases the contact area and friction, effectively preventing the material bar from slipping when rotating at high speed, while the elastic material can buffer vibration and prevent material surface damage, further ensuring processing quality.

[0022] 2. By setting up an ejector pin mechanism, the accuracy of ejector pin pressure adjustment and motion stability are significantly improved. The rolling contact design of the main ball and auxiliary ball greatly reduces frictional loss during force transmission. Combined with the threaded drive of the threaded rod, the ejector pin pressure can be finely adjusted to meet the clamping requirements of different material bars. The pre-compression structure of the spring provides stable pre-tightening force and enables the ejector pin to quickly reset, avoiding jamming. The design of the guide sleeve and the hard alloy contact end limits the radial swing of the ejector pin, ensures the coaxiality of the ejector pin and the material bar, reduces machining eccentricity error, and enhances the wear resistance of the ejector pin, extending its service life. The overall structure makes the ejector pin evenly stressed, effectively preventing the material bar from shifting under pressure and improving the dimensional accuracy of the workpiece.

[0023] 3. By setting up a plug-in mechanism, the multiple plug-in cooperation of the limiting components, fixing parts and limiting rods forms a three-dimensional locking effect, which can effectively disperse the force generated by processing vibration and prevent the ejector seat from shifting; the elastic flipping design of the conical gasket automatically opens and fits the contact surface when the nut is tightened, filling the tiny gaps, offsetting the loosening tendency caused by vibration, and improving the locking reliability; the disassembly and assembly process does not require complicated tools, the operation is convenient, and the position switching and fixing of the ejector seat can be completed quickly, adapting to the position adjustment needs under different processing scenarios, which not only ensures the stability of the processing process, but also improves the efficiency of equipment debugging and maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0025] Figure 2 This is a right view of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0026] Figure 3 This invention provides a positional diagram of the hydraulic motor for the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool.

[0027] Figure 4 A three-dimensional view of the U-shaped frame of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0028] Figure 5 This is a diagram showing the position of the ejector mechanism in the ejector structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention.

[0029] Figure 6 This is a cross-sectional view of the connecting component of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0030] Figure 7 This is a front view of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0031] Figure 8 This is a perspective view of the insertion mechanism of the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention;

[0032] Figure 9 This is a diagram showing the position of the conical shim in the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool proposed in this invention.

[0033] In the diagram: 1. Machine tool; 2. Adjustment mechanism; 21. Hydraulic motor one; 22. U-shaped frame; 23. Fixed bracket; 24. Dovetail guide rail; 25. Ejector seat; 26. Hydraulic motor two; 27. Fixed ring; 28. Rotary disc; 29. ​​Chuck; 3. Ejector mechanism; 31. Connecting part; 32. Steel ball hole; 33. Threaded hole; 34. Threaded rod; 35. Main ball; 36. Secondary ball; 37. Spring; 4. Insertion mechanism; 41. Limiting component; 42. Fixing part; 43. Limiting rod; 44. Nut; 45. Conical washer; 46. Limiting block; 5. Material bar; 6. Ejector. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Reference Figures 1-9 A pin structure for a vertical cradle five-axis turning and milling composite machine tool includes a machine tool 1. The base of the machine tool 1 is U-shaped with the opening facing upward. An adjustment mechanism 2 is provided at one end of the base of the machine tool 1. A pin mechanism 3 is provided at one end of the adjustment mechanism 2. A pin 6 is provided at the lower end of the pin mechanism 3. A plug-in mechanism 4 is provided on one side of the adjustment mechanism 2. A material bar 5 is provided at the upper end of the adjustment mechanism 2. The lower end of the pin 6 is pressed and connected to the upper end of the material bar 5.

[0036] In this embodiment, the adjustment mechanism 2 includes a hydraulic motor 21 embedded in one end of the base of the machine tool 1. The output shaft of the hydraulic motor 21 is rotatably connected to a U-shaped frame 22. One end of the U-shaped frame 22 is fixedly connected to a fixed bracket 23. The upper side of the fixed bracket 23 is fixedly connected to a dovetail guide rail 24. The side of the dovetail guide rail 24 has slots arranged in an array. The surface of the dovetail guide rail 24 is slidably connected to a pin seat 25. A hydraulic motor 26 is embedded in the middle of the U-shaped frame 22. A fixed ring 27 is fixedly connected to the U-shaped surface of the U-shaped frame 22. The output shaft end of the hydraulic motor 26 is fixedly connected to a rotating disk 28. The lower end of the rotating disk 28 is rotatably connected to the surface of the fixed ring 27. A chuck 29 is fixedly connected to the center of the upper end of the rotating disk 28. The jaws of the chuck 29 are clamped and connected to the lower end of the material bar 5.

[0037] Specifically, hydraulic motor 21 drives U-shaped frame 22 to rotate around its output shaft, achieving cradle-type angle adjustment to meet the cutting requirements of different angles in five-axis machining; hydraulic motor 26 drives rotating disk 28 to rotate smoothly along the surface of fixed ring 27, thereby driving chuck 29 and the clamped material bar 5 to rotate synchronously, cooperating with cutting tools to complete turning machining; the trapezoidal structure of dovetail guide rail 24 can limit the fall off of ejector pin seat 25, and the slots on its surface can adapt to the fixing requirements of different positions. Through the sliding adjustment of ejector pin seat 25, it can adapt to material bars 5 of different lengths and specifications, improving the versatility of the mechanism.

[0038] In this embodiment, the ejector mechanism 3 includes a connector 31. The lower end of the connector 31 has a circumferential array of ball holes 32. The connector 31 has a threaded hole 33 in the vertical direction. The lower end of the threaded hole 33 has a mounting hole. The inner wall of the mounting hole is fixedly connected to the inner wall of the ball hole 32. The inner wall of the threaded hole 33 is threadedly connected to a threaded rod 34. The lower end of the threaded rod 34 is pressed and connected to a main ball 35. The inside of the ball hole 32 is provided with a secondary ball 36. The surface of the secondary ball 36 is in contact with the surface of the main ball 35. The surface of the main ball 35 is pressed and connected to the upper end of the ejector pin 6. A spring 37 is slidably sleeved on the upper surface of the ejector pin 6. The upper end of the spring 37 is fixedly connected to the upper end of the ejector pin 6. The lower end of the spring 37 is fixedly connected to the inner bottom wall of the mounting hole.

[0039] Specifically, rotating the threaded rod 34 allows it to move up and down along the threaded hole 33. When moving downwards, it compresses the main ball 35. The main ball 35, through spherical contact, synchronously pushes the auxiliary ball 36 in a circular array. The auxiliary ball 36 extends outwards along the ball hole 32 and compresses the upper end of the ejector pin 6, driving the ejector pin 6 to move downwards and press the material rod 5. The spring 37 is always in a compressed state, providing preload to the ejector pin 6 and also resetting the ejector pin 6 when the threaded rod 34 is adjusted upwards, preventing the ejector pin 6 from jamming. The rolling contact design of the main and auxiliary balls significantly reduces frictional loss during force transmission, ensuring the smooth movement of the ejector pin 6 and ensuring uniform force on the ejector pin 6, preventing the material rod 5 from shifting under pressure.

[0040] In this embodiment, one end of the ejector pin seat 25 is provided with a limiting groove that matches the auxiliary ball 36, and the two sides of one end of the ejector pin seat 25 are respectively provided with insertion holes that match the slot.

[0041] Specifically, the inner wall of the limiting groove has an arc-shaped structure that fits tightly against the spherical surface of the auxiliary ball 36, which can limit the radial displacement of the auxiliary ball 36 and prevent the auxiliary ball 36 from falling out of the ball hole 32 or shifting when the ejector mechanism 3 is working, ensuring that the force direction of the ejector 6 is always vertically downward; the insertion holes on both sides of the ejector seat 25 correspond to the slot positions of the dovetail guide rail 24. When the ejector seat 25 slides to the target position, the insertion hole and the slot are precisely aligned, providing a positioning reference for the installation of the insertion mechanism 4 and ensuring the stability of the ejector seat 25 after it is fixed.

[0042] In this embodiment, the insertion mechanism 4 includes a limiting component 41 that slides into the inner wall of the slot. One end of the limiting component 41 is slidably inserted with a fixing component 42. A limiting insertion hole is opened in the vertical direction of the fixing component 42. A limiting rod 43 is inserted into the inner wall of the limiting insertion hole. One end of the limiting component 41 is provided with a fixing hole that matches the limiting rod 43. The upper end of the limiting rod 43 is threaded. The upper end of the limiting rod 43 passes through the limiting component 41 and is threaded with a nut 44.

[0043] Specifically, during installation, first insert the limiting component 41 into the slot of the dovetail guide rail 24 and the insertion hole of the ejector seat 25, then insert the pre-reserved slot of the fixing component 42 into the end of the limiting component 41, so that the limiting insertion hole of the fixing component 42 is aligned with the fixing hole of the limiting component 41, and finally insert the limiting rod 43 into the aligned hole and tighten the upper nut 44 to lock the ejector seat 25. This structure achieves fixation through multiple plug-in connections, and the disassembly and assembly process does not require complicated tools, making it convenient to operate. It can also effectively disperse the force generated by processing vibration and prevent the ejector seat 25 from shifting.

[0044] In this embodiment, the lower end of the limiting rod 43 is provided with an installation groove, and a conical gasket 45 is elastically hinged to the inner wall of the installation groove. The lower surface of the conical gasket 45 is tightly attached to the limiting block 46, and the lower end of the limiting block 46 is fixedly connected to the inner wall of the installation groove.

[0045] Specifically, the conical gasket 45 is made of spring steel, and its hinged structure gives it a certain elastic flipping ability. When the limiting rod 43 is inserted into the limiting insertion hole of the fixing member 42, the conical gasket 45 is compressed and retracts into the mounting groove. When there is no pressure, the conical gasket 45 naturally springs open. The limiting block 46 can limit the maximum flipping angle of the conical gasket 45 to prevent it from excessively deforming and failing. This design can counteract the loosening tendency caused by vibration during processing and improve the locking reliability of the insertion mechanism 4.

[0046] In this embodiment, the tapered gasket 45 is located between the fixing member 42 and the ejector pin seat 25.

[0047] Specifically, this position design allows the conical washer 45 to act directly on the contact surface between the fixing member 42 and the ejector seat 25. When the nut 44 is tightened, the limiting rod 43 moves upward, and at the same time, it drives the conical washer 45 to penetrate deeper between the fixing member 42 and the ejector seat 25, thereby increasing the gap between the two to a certain extent. However, the presence of the conical washer 45 ensures the fixing effect between the insertion mechanism 4 and the ejector seat 25, and avoids the ejector seat 25 from loosening between the dovetail guide rail 24 due to long-term operation.

[0048] In this embodiment, the lower contact end of the ejector pin 6 is made of hard alloy material, and a guide sleeve is provided between the outer wall of the ejector pin 6 and the inner wall of the mounting hole. The inner wall of the guide sleeve slides and fits against the outer wall of the ejector pin 6.

[0049] Specifically, the cemented carbide material has the characteristics of high strength and high wear resistance, which can withstand the friction and pressure when the material bar 5 rotates at high speed, avoid wear and deformation of the contact end of the ejector pin 6, and extend its service life; the guide sleeve is made of tin bronze, which has good self-lubricating properties, which can reduce the frictional resistance between the ejector pin 6 and the mounting hole when the ejector pin 6 slides up and down, while limiting the radial swing of the ejector pin 6, ensuring the coaxiality of the ejector pin 6 and the material bar 5, avoiding the material bar 5 from eccentric shaking during the processing, and improving the processing accuracy.

[0050] In this embodiment, each jaw of the chuck 29 is provided with an arc-shaped anti-slip pad on its inner wall. The surface of the arc-shaped anti-slip pad is provided with an array of anti-slip patterns, and the arc-shaped anti-slip pad is made of elastic and wear-resistant rubber material.

[0051] Specifically, the curved surface of the arc-shaped anti-slip pad fits against the outer wall of the material bar 5, which can increase the contact area between the claw and the material bar 5, disperse the clamping pressure, and prevent the claw from damaging the surface of the material bar 5; the anti-slip texture on the surface can enhance the friction and prevent the material bar 5 from slipping when it rotates at high speed; the elastic rubber material can adapt to material bars 5 of different diameters, and through its own deformation, it can fit tightly against the material surface, improve the adaptability and stability of clamping, and at the same time buffer the impact of processing vibration on the material bar 5.

[0052] Reference Figures 1-9 A construction method for the ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool, the specific steps of which are as follows:

[0053] Step 1: Place the material bar 5 vertically in the center of the chuck 29, and adjust the jaws of the chuck 29 to retract towards the center, so that the arc-shaped anti-slip pad on the inner wall of the jaws fits tightly against the lower outer wall of the material bar 5. The anti-slip texture on the surface of the anti-slip pad increases the friction, and at the same time, the deformation of the elastic rubber material adapts to the outer diameter of the material bar 5, ensuring that the material bar 5 is vertically centered and has no radial offset, thus completing the initial fixation of the lower end.

[0054] Step 2: Slide the ejector seat 25 along the dovetail guide rail 24 to drive the ejector mechanism 3 to move synchronously until the lower end of the ejector 6 is aligned with the upper center of the material rod 5. At this time, the insertion holes on both sides of the ejector seat 25 are precisely aligned with the slots of the dovetail guide rail 24. Insert the limiting component 41 into the aligned slots and insertion holes, and then insert the fixing component 42 into the limiting component 41 to align the limiting insertion hole with the fixing hole at its end. Insert the limiting rod 43, and the conical washer 45 will spring open and fit against the side of the ejector seat 25. Tighten the nut 44 to lock the ejector seat 25. The limiting rod 43 will move upward due to the rotation and tightening of the nut 44. The spring-opening conical washer 45 will be embedded between the ejector seat 25 and the fixing component 42 to increase the fixing effect.

[0055] Step 3: Rotate the threaded rod 34 to move it downward along the threaded hole 33 and squeeze the main ball 35. The main ball 35 pushes the auxiliary ball 36 of the circumferential array to extend out along the steel ball hole 32, and the main ball 35 moves down to squeeze the upper end of the ejector pin 6, driving the ejector pin 6 to slide downward along the guide sleeve until the hard alloy contact end of the ejector pin 6 is tightly attached to the upper end of the material bar 5. Continue to fine-tune the threaded rod 34 to keep the spring 37 in a compressed state, providing a stable preload force for the ejector pin 6, and realizing bidirectional fixation of the upper and lower ends of the material bar 5.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pin structure for a vertical cradle five-axis turning and milling composite machine tool, comprising a machine tool (1), characterized in that: The base of the machine tool (1) is U-shaped with the opening facing upward. An adjustment mechanism (2) is provided at one end of the base of the machine tool (1). A ejector mechanism (3) is provided at one end of the adjustment mechanism (2). An ejector pin (6) is provided at the lower end of the ejector mechanism (3). A plug-in mechanism (4) is provided on one side of the adjustment mechanism (2). A material rod (5) is provided at the upper end of the adjustment mechanism (2). The lower end of the ejector pin (6) is pressed and connected to the upper end of the material rod (5). The adjustment mechanism (2) includes a hydraulic motor (21) embedded in one end of the base of the machine tool (1). The output shaft of the hydraulic motor (21) is rotatably connected to a U-shaped frame (22). One end of the U-shaped frame (22) is fixedly connected to a fixed bracket (23). The upper side of the fixed bracket (23) is fixedly connected to a dovetail guide rail (24). The side of the dovetail guide rail (24) is provided with slots. The surface of the dovetail guide rail (24) is slidably connected to a pin seat (25). A hydraulic motor 2 (26) is embedded in the middle of the U-shaped frame (22). A fixing ring (27) is fixedly connected to the U-shaped surface of the U-shaped frame (22). A rotating disk (28) is fixedly connected to the output shaft end of the hydraulic motor 2 (26). The lower end of the rotating disk (28) is rotatably connected to the surface of the fixing ring (27). A chuck (29) is fixedly connected to the center of the upper end of the rotating disk (28). The chuck (29) has its claws clamped and connected to the lower end of the material bar (5). The ejector mechanism (3) includes a connector (31). The lower end of the connector (31) has a circumferential array of ball holes (32). The connector (31) has a threaded hole (33) in the vertical direction. The lower end of the threaded hole (33) has a mounting hole. The inner wall of the mounting hole is fixedly connected to the inner wall of the ball hole (32). The inner wall of the threaded hole (33) is threaded with a threaded rod (34). The lower end of the threaded rod (34) is pressed and connected with a main ball. (35) The inside of the ball hole (32) is provided with a secondary ball (36). The surface of the secondary ball (36) is in contact with the surface of the main ball (35). The surface of the secondary ball (36) is pressed and connected to the upper end of the ejector pin (6). A spring (37) is slidably sleeved on the upper end surface of the ejector pin (6). The upper end of the spring (37) is fixedly connected to the upper end of the ejector pin (6). The lower end of the spring (37) is fixedly connected to the inner bottom wall of the mounting hole. The insertion mechanism (4) includes a limiting component (41) that slides into the inner wall of the slot. A fixing component (42) is slidably inserted into one end of the limiting component (41). A limiting insertion hole is opened in the vertical direction of the fixing component (42). A limiting rod (43) is inserted into the inner wall of the limiting insertion hole. A fixing hole that matches the limiting rod (43) is opened at one end of the limiting component (41). The upper end of the limiting rod (43) is threaded. The upper end of the limiting rod (43) passes through the limiting component (41) and is threaded with a nut (44).

2. The ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool according to claim 1, characterized in that: One end of the ejector pin seat (25) is provided with a limiting groove that is compatible with the auxiliary ball (36), and the two sides of one end of the ejector pin seat (25) are respectively provided with insertion holes that are compatible with the slot.

3. The ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool according to claim 2, characterized in that: The lower end of the limiting rod (43) is provided with an installation groove, and a conical gasket (45) is elastically hinged to the inner wall of the installation groove. The lower surface of the conical gasket (45) is tightly attached to the limiting block (46), and the lower end of the limiting block (46) is fixedly connected to the inner wall of the installation groove.

4. The ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool according to claim 3, characterized in that: The conical gasket (45) is located between the fixing member (42) and the ejector pin seat (25).

5. The ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool according to claim 4, characterized in that: The lower contact end of the ejector pin (6) is made of hard alloy material. A guide sleeve is provided between the outer wall of the ejector pin (6) and the inner wall of the mounting hole. The inner wall of the guide sleeve slides and fits against the outer wall of the ejector pin (6).

6. The ejector pin structure of a vertical cradle five-axis turning and milling composite machine tool according to claim 5, characterized in that: Each claw of the chuck (29) is provided with an arc-shaped anti-slip pad on its inner wall. The surface of the arc-shaped anti-slip pad is provided with an array of anti-slip patterns, and the arc-shaped anti-slip pad is made of elastic and wear-resistant rubber material.

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